Henan Zhongxin Aluminum Co.,Ltd.

22/05/2026

Looking for the right aluminum sheet for your project? 🏭

We just published a complete guide on 1060 aluminum sheet — covering properties, tempers, sizing, and how it stacks up against 6061, 5052, and 3003.

1060 aluminum is the go-to choice for:
⚡ Electrical busbars and transformer windings
🏠 Roofing and cladding panels
🍳 Cookware and food equipment
🔋 Battery current collector foil

Whether you're an engineer, buyer, or manufacturer — this guide has everything you need.

🔗 Read more:

1060 aluminum sheet offers 99.6% purity, excellent conductivity (~61% IACS), and easy formability. Compare 1060 vs 6061, 5052, and 3003. View properties, tempers (O, H14, H24), and get a quote.

18/05/2026

🔵 Does your building cladding still look good after 20 years?
With PVDF coated aluminum coil, the answer is yes.
PVDF coating bonds directly to the aluminum surface through a high-temperature coil coating process — delivering a finish that resists UV, acid rain, salt spray, and industrial pollution for 20–30 years without fading or peeling.
✅ 1,000+ colors available — RAL, Pantone, NCS or custom match
✅ Thickness 0.2–4.0mm | Width up to 2650mm
✅ AAMA 2605 certified
✅ Factory direct pricing | Low MOQ
Whether you need facade panels, roofing coil, ACP facing, or ceiling systems — we supply it all.
👉 Get your free quote today.

15/05/2026

🤔 Choosing between 5083 and 5052 aluminum?

You're not alone — it's one of the most common questions we get from buyers in shipbuilding and automotive industries.

Here's the short answer:
➡️ Need maximum strength + seawater resistance? → Go with 5083
➡️ General sheet metal work on a tighter budget? → 5052 works fine

But there's a lot more to it — temper selection, welding wire choice, price factors...

We just wrote a detailed guide that covers it all. No fluff, just the specs and facts you need before placing your order.

📖 Check it out: on our website.

💬 What industry do you use aluminum coil in? Drop a comment below — we'd love to hear from you!

Welcome to contact us:
Email: [email protected]
Tel: 0086-371-68630632
WhatsApp/WeChat: 0086-13526561516

11/05/2026

If you're sourcing aluminum flat products, here's the question that comes up on almost every project:

Sheet or plate?

The short answer depends on what you're building:

Choose sheet (≤6.35 mm) for:
— Roofing and wall cladding (3003-H24, 0.5–1.2 mm)
— HVAC ductwork (3003-H14)
— Signage and advertising panels (1100/5052, 1–3 mm)
— Sublimation photo printing (coated 1100, 0.45–1.5 mm)
— Anodized decorative panels (6063/1100)
— Food packaging and containers (1100-O)

Choose plate (>6.35 mm) for:
— Marine hull and ship structure (5083-H116, 6–20 mm)
— Machine bases and tooling (6061-T651, 10–100 mm)
— Aerospace structural parts (2024-T351 / 7075-T651)
— Pressure vessels and tanks (5083/6061)

We've also put together a gauge-to-mm conversion chart, a price-per-square-meter calculation guide, and a full ordering checklist — all in one article.

Link in the first comment.

We supply both sheet and plate across all major alloys, with cut-to-size service and MTC documentation. RFQ response within 24 hours.

09/05/2026

2024 vs 7075 Aluminum: Which High-Strength Alloy Is Right for Your Aerospace Application?

2024 vs 7075 Aluminum: Which High-Strength Alloy Is Right for Your Aerospace Application?
When structural weight is critical and failure is not an option, engineers reach for two aluminum alloys above all others: 2024 and 7075. Both deliver strength levels that far exceed the general-purpose alloys used in construction or packaging. Both are heat-treatable, precision-machinable, and decades-proven in demanding aerospace and defense applications.
But they are not interchangeable. 7075 is stronger by static measurement. 2024 resists fatigue crack growth better. The difference between these two characteristics determines which alloy goes where on an aircraft — and why experienced aerospace engineers specify them for different structural zones even on the same airframe.
This guide covers every dimension of the 2024 vs 7075 aluminum comparison: mechanical properties, temper designations, fatigue and fracture behavior, corrosion resistance, applications, machinability, price, and aerospace certification requirements. By the end, you will have a clear framework for selecting the right alloy for your specific application.

1. Why 2024 and 7075 Dominate Aerospace Aluminum
Both alloys belong to the heat-treatable family of aluminum alloys — meaning their strength comes primarily from a controlled heat treatment process rather than cold working. This allows them to achieve strength levels that are simply not reachable by work-hardened alloys like 1100, 3003, or 5052.
2024 belongs to the 2### series, where copper is the primary alloying element. Copper forms strengthening precipitates (Al2CuMg) during aging that dramatically increase dislocation resistance. The result is an alloy with outstanding fatigue crack growth resistance and fracture toughness — the properties that matter most in tension-loaded, cyclically stressed airframe structures.
7075 belongs to the 7### series, where zinc is the primary alloying element. The zinc-magnesium-copper combination produces even finer, denser strengthening precipitates (MgZn2) than 2024, pushing static tensile strength to levels approaching some steels. 7075-T6 reaches 572 MPa tensile strength — among the highest of any commercially available aluminum alloy.
The two alloys have coexisted in aerospace design for decades precisely because they serve different structural functions. Understanding those functions is the key to correct alloy selection.

2. 2024 vs 7075: Full Property Comparison
The table below compares 2024 and 7075 aluminum in their most common aerospace tempers: 2024-T3 and 7075-T6. Additional tempers are covered in Section 3.

Property 2024-T3 / T351 7075-T6 / T651
Tensile strength 483 MPa (70 ksi) 572 MPa (83 ksi)
Yield strength 345 MPa (50 ksi) 503 MPa (73 ksi)
Fatigue strength (R.R. Moore) 138 MPa (20 ksi) 159 MPa (23 ksi)
Fracture toughness (KIc) ~36 MPa·m½ — superior ~27 MPa·m½
Crack growth rate (da/dN) Slower — better damage tolerance Faster
Elongation at break ~18% — more ductile ~11%
Brinell hardness ~120 HB ~150 HB
Density 2.78 g/cm³ 2.81 g/cm³
Thermal conductivity 121 W/m·K 130 W/m·K
Machinability Excellent Excellent (slightly faster)
Weldability (fusion) Not recommended — hot cracking risk Not recommended — hot cracking risk
Friction stir welding (FSW) Acceptable Acceptable
Corrosion resistance Poor — requires Alclad or anodize Poor in T6 — T73 improves SCC
SCC resistance (T6/T3) Moderate Low in T6; good in T73/T7351
Primary strengthening Al-Cu-Mg (2### series) Al-Zn-Mg-Cu (7### series)
Relative cost High Higher

Several numbers in this table deserve explanation. First, fracture toughness: 2024-T351 delivers approximately 36 MPa·m½ compared to about 27 MPa·m½ for 7075-T6 — a 33% advantage. Fracture toughness measures how much stress a material can withstand in the presence of a crack before that crack propagates catastrophically. In tension-loaded skin panels that experience tens of thousands of pressurization cycles over an aircraft's life, this matters enormously.
Second, crack growth rate: even though 7075-T6 has a slightly higher fatigue strength on a smooth-specimen basis, 2024-T3 propagates fatigue cracks more slowly under the same stress intensity conditions. This is why damage-tolerant aircraft design — the philosophy that assumes cracks will form and asks how long until they become dangerous — favors 2024 for primary tension structure.
Third, elongation: 2024-T3's 18% elongation versus 7075-T6's 11% reflects meaningfully better ductility, which contributes to its damage tolerance and also makes it easier to form in the T4 temper before aging.

3. Temper Designations: T3, T351, T4, T6, T651, T73, T7351 Explained
The temper code is as important as the alloy number. The same base alloy in different tempers can have dramatically different strength, toughness, and corrosion resistance. Specifying the wrong temper is a common and costly procurement error.
2024 tempers
•2024-T3: Solution heat-treated, cold-worked, and naturally aged. The most widely specified temper for 2024 sheet and thin plate. Combines high fatigue resistance with good ductility and the damage tolerance properties that make 2024 the historical standard for fuselage and lower wing skin applications.
•2024-T351: Solution heat-treated, stress-relieved by stretching, and naturally aged. The T351 designation indicates that the plate has been stretched to eliminate residual stresses from quenching. This produces superior dimensional stability during machining — critical for thick-plate structural components where tight tolerances are required. This temper is the standard for machined fuselage frames and bulkheads.
•2024-T4: Solution heat-treated and naturally aged without cold working. Lower strength than T3 but better formability. Used when the part must be bent, drawn, or formed before final assembly. The natural aging can continue slowly at room temperature over time.
•2024-T81 / T861: Artificially aged after cold work. Higher strength than T3 but reduced fracture toughness and ductility. Used in specific structural applications where maximum strength is required and the toughness trade-off is acceptable.
7075 tempers
•7075-T6: Solution heat-treated and artificially aged to peak strength. The strongest common temper, reaching 572 MPa tensile strength. The standard specification for compression-loaded structures, highly stressed machined parts, and applications where maximum static strength is the governing criterion. This is the temper behind the high search volumes for 7075-T6 pricing.
•7075-T651: T6 with added stress relief by stretching. Eliminates quench-induced residual stresses, producing a plate with excellent flatness and dimensional stability for precision machining. The standard specification for machined structural plates, tooling plates, and components requiring tight tolerances after machining.
•7075-T73: Over-aged beyond peak strength. Tensile strength drops to approximately 503 MPa — about 12% below T6 — but resistance to stress-corrosion cracking (SCC) improves dramatically. The correct temper for 7075 components in humid or marine environments, or wherever SCC risk must be minimized. Landing gear and structural fittings exposed to outdoor environments commonly specify T73.
•7075-T7351: T73 properties with stress relief by stretching. The standard for thick machined plates in applications requiring both SCC resistance and dimensional stability. Widely used in commercial aircraft structural fittings.
•7075-T76 / T7651: An intermediate temper between T6 and T73. Provides better corrosion resistance than T6 with less strength sacrifice than T73. Used where an optimized balance between strength and environmental durability is required.
A critical procurement note: when ordering 7075 for outdoor or humid environments, always specify T73 or T7351 rather than T6. The strength difference is modest but the SCC risk reduction is substantial. Many corrosion failures in 7075 components can be traced to T6 being used in environments that required T73.

4. Fatigue and Fracture Toughness: Why 2024 Wins in Cyclic Loading
This is the most technically important distinction between the two alloys — and the one most often misrepresented by simple property comparisons that focus only on tensile strength.
The fatigue strength misconception
On a smooth-specimen basis, 7075-T6 has a slightly higher fatigue strength than 2024-T3: approximately 159 MPa versus 138 MPa at 10^8 cycles in a rotating-bending (R.R. Moore) test. This leads some to conclude that 7075 is better for fatigue applications. That conclusion is incorrect for structural aerospace design.
Real aircraft structures are not smooth specimens. They contain fastener holes, cutouts, stress concentrations, and surface scratches from manufacturing and handling. In the presence of these stress risers, what matters is not the fatigue initiation threshold but the rate at which fatigue cracks grow once they have initiated — and how large a crack can become before it causes catastrophic failure.
Damage tolerance and fracture mechanics
2024 aluminum is significantly tougher than 7075 in the fracture mechanics sense. Its fracture toughness (KIc) of approximately 36 MPa·m½ means it can tolerate a larger critical crack size before fast fracture, and it propagates fatigue cracks more slowly at the same stress intensity factor. Both properties are central to the damage-tolerant design philosophy required by FAA regulations for civil transport aircraft (FAR 25.571).
The practical consequence is longer inspection intervals. If a fuselage skin panel develops a fatigue crack, a 2024-T3 panel gives structural engineers more time between when the crack initiates and when it reaches critical size — measured in flight cycles, this difference can be significant. Longer inspection intervals mean lower maintenance costs over the aircraft's service life.
The historic Boeing and Airbus design logic
This is why traditional wide-body commercial aircraft design uses 2024-T3 for fuselage lower skin and lower wing skin — the tension-loaded surfaces that experience cyclic pressurization and bending loads in flight — while specifying 7075-T6 or T651 for upper wing skin and primary spars, where compressive loads dominate and static strength is the governing criterion. Both alloys work together, each performing the function it does best. Modern aluminum-lithium alloys (2###-Li and 7###-Li) are extending this design logic with weight reductions, but the underlying principle — fatigue-critical zones want 2024-family properties, strength-critical zones want 7075-family properties — remains valid.

5. Application Guide: Which Alloy Goes Where

Component / application Best alloy Key reason
Fuselage lower skin (tension) 2024-T3 Fatigue crack growth resistance, damage tolerance
Lower wing skin (tension) 2024-T3 / T351 Cyclic tension loading, fracture toughness
Fuselage frames & bulkheads 2024-T351 Thick-plate machining, dimensional stability
Upper wing skin (compression) 7075-T6 / T651 Compressive strength governs — no fatigue penalty
Wing spars (flanges & webs) 7075-T6 / T651 Highest bending moment, strength-critical
Landing gear components 7075-T73 / T7351 High static load + SCC resistance required
Precision machined structural parts 7075-T651 Best strength-to-weight, excellent machinability
UAV / drone frames 7075-T6 Highest strength-to-weight ratio, lightweight
Helicopter rotor fittings 2024-T351 High-cycle fatigue, damage tolerance design
Propeller blades 2024-T3 Rotating fatigue loading
Pressure bulkheads 2024-T351 Fracture toughness, thin-gauge sheet
High-end cycling frames / sports 7075-T6 Max strength-to-weight for non-fatigue-critical

UAV and drone applications
Unmanned aerial vehicles represent one of the fastest-growing markets for 7075-T6 aluminum. UAV frames must minimize weight to maximize payload and flight time, and the strength-to-weight ratio of 7075-T6 is unmatched among common aluminum alloys. Because UAV airframes typically operate in short-duration flights with lower cycle counts than manned commercial aircraft, the fatigue crack growth advantage of 2024 is less critical — making 7075-T6 the dominant choice for UAV structural components including frames, arms, and motor mounts.
Sports and high-performance applications
7075-T6 has found a significant market in high-performance sporting goods: bicycle frames and components, climbing equipment, skateboard trucks, and precision sports equipment. These applications share the same logic as UAV frames — maximum strength at minimum weight, with cycle counts and stress histories that do not make 2024's damage tolerance advantage the determining factor.

6. Corrosion Resistance: Both Alloys’ Weak Point
Compared to the 5### and 6### series alloys, both 2024 and 7075 have relatively poor inherent corrosion resistance. This is a direct consequence of their high copper or zinc-copper content — the same elements that produce their exceptional strength create micro-galvanic cells at grain boundaries that accelerate pitting and stress-corrosion cracking in corrosive environments.
2024 corrosion protection
The standard solution for 2024 sheet in aerospace applications is Alclad: a thin layer of commercially pure aluminum (1### series) is metallurgically bonded to each surface of the 2024 core during hot rolling. The pure aluminum cladding acts as a sacrificial anode, corroding preferentially and protecting the high-strength core. Alclad 2024-T3 is one of the most widely used materials in commercial aircraft fuselage construction.
For applications where Alclad is not used, 2024 requires anodizing (typically sulfuric acid or chromic acid anodizing in aerospace, now often replaced by boric-sulfuric acid anodizing for environmental compliance) plus a primed and painted surface system.
7075 corrosion and SCC management
7075-T6 is susceptible to stress-corrosion cracking (SCC) in humid or chloride-containing environments. SCC occurs when a susceptible material under sustained tensile stress is exposed to a corrosive environment, causing cracks to propagate at stress levels far below the static yield strength. T6 temper 7075 is among the most SCC-susceptible common aluminum alloys.
The solution is temper selection. 7075-T73 and T7351 are produced by over-aging beyond the T6 peak, which coarsens the grain boundary precipitates and dramatically reduces SCC susceptibility. The trade-off — approximately 12% reduction in tensile strength — is generally acceptable for landing gear, fittings, and structural parts exposed to outdoor environments.
All 7075 components in exterior applications should be anodized and coated. Bare 7075 in humid or marine atmospheres will develop surface pitting within months.

7. Machinability and Fabrication
CNC machining
Both 2024 and 7075 are among the most machinable aluminum alloys available. They cut cleanly, hold tight tolerances, and are the default choice for precision aluminum CNC machining across aerospace, defense, and high-performance engineering.
7075 machines slightly faster than 2024. Its higher hardness (approximately 150 HB versus 120 HB for 2024-T3) produces more brittle chips that break cleanly, reducing chip re-cutting and surface damage on long-duration cuts. Surface finishes below Ra 0.4 are routinely achievable on both alloys with standard tooling and coolant.
2024 is somewhat more prone to built-up edge (BUE) on cutting tools, particularly at lower cutting speeds. Using sharp carbide tooling, adequate coolant flow, and appropriate cutting speeds minimizes this effect. For deep-hole drilling and threading, both alloys perform well, though tool life is slightly longer with 7075.
Welding
Neither 2024 nor 7075 is recommended for conventional fusion welding (MIG or TIG). Both alloys are susceptible to hot cracking in the weld heat-affected zone, and the welding heat reduces the strength of the age-hardened zone to near-annealed levels. For structural applications requiring welded joints, designers typically use mechanical fasteners (rivets or bolts) as the primary joining method.
Friction stir welding (FSW) is a solid-state process that significantly reduces the hot cracking risk and HAZ strength loss compared to fusion welding. FSW of both 2024 and 7075 is used in aerospace manufacturing — notably in spacecraft fuel tanks and some aircraft structural panels — where it provides weld-zone strength retention of 70 to 90% of parent-metal strength. FSW requires specialized equipment and is a production process rather than a field repair method.
Forming
2024-T4 is the specified temper for forming operations: parts are formed in the T4 condition (solution heat-treated and naturally aged, without the cold work of T3), then aged to T3 or T81 after forming. The T4 temper provides sufficient ductility for complex shapes while still allowing final strength to be achieved after the forming operation is complete.
7075 in T6 temper is difficult to form — its high yield strength and limited ductility cause springback and cracking on tight-radius bends. Parts requiring significant forming are produced from 7075-O (annealed) stock and then heat-treated after forming, or from T4 temper where available.

8. Price: What Drives the Cost of Aerospace-Grade Aluminum
Both 2024 and 7075 aluminum are premium-priced alloys relative to the general-purpose grades discussed in other articles in this series. Both are significantly more expensive than 6061-T6, and considerably more expensive than 3003 or 1100. Here is what drives the cost.
Raw material premium
7075 is typically more expensive than 2024 on a per-kilogram basis. The primary reason is zinc content: 7075 contains 5.6 to 6.1% zinc, an element that is more costly than the copper-magnesium combination used in 2024. The price differential varies with market conditions but is generally consistent. Both alloys cost approximately two to three times more per kilogram than 6061-T6, and four to six times more than 3003.
Temper and processing premium
Within each alloy, the temper significantly affects price. For 7075, T651 commands a premium over T6 because of the added stretching operation. T73 and T7351 are priced above T6 because of the additional aging cycle required for the over-aged condition. For 2024, T351 carries a premium over T3 for similar reasons. When comparing quotes for the same alloy, always confirm that the temper is the same before concluding that one supplier is cheaper than another.
Aerospace certification premium
Aerospace-grade material — produced and certified to AMS specifications with full material test reports, heat traceability, and certified mechanical properties — carries a significant premium over commercial-grade material of the same alloy and temper. This is not simply a paperwork cost: aerospace-grade production involves tighter process controls, more extensive testing, and full lot traceability from the smelting heat through final inspection.
For aerospace and defense applications where regulatory compliance is required, there is no substitute for AMS-certified material. For non-aerospace applications — UAV hobbyist frames, sporting equipment, general precision machining — commercial-grade 7075-T6 or 2024-T3 is available at meaningfully lower cost and is entirely appropriate.
Thickness and form factor
Thin sheet and foil-gauge material carries a higher processing cost per kilogram than medium-thickness plate. Large-format plate (widths over 1500 mm or thicknesses over 50 mm) may carry a premium for specialty rolling or press capacity. Extruded shapes and bar stock are priced separately from flat-rolled products.
Contact our sales team with your alloy, temper, thickness, width, length, required quantity, and any certification requirements. We will provide current pricing and lead time within 24 hours.

9. Aerospace Standards and Certifications
For aviation and defense applications, material certification is not optional. The alloy and temper on the purchase order must match the certification documents, and the documents must trace the material back to its original heat of production.
Key material specifications
•2024 sheet and plate: AMS 2024 (most common aerospace specification), AMS-QQ-A-250/4, ASTM B209
•7075 sheet and plate: AMS 7075, AMS-QQ-A-250/12, ASTM B209
•Alclad 2024: AMS 2024, Clad (sheet) — requires additional documentation confirming cladding thickness and composition
•Bar, rod, and extruded shapes: separate AMS specifications apply (AMS 2024 covers sheet/plate; AMS 4152 covers bar for 2024; AMS 4122 covers bar for 7075)
Required documentation
•Material Test Report (MTR) / Mill Test Certificate (MTC): must include heat (lot) number, chemical composition analysis, mechanical test results (tensile strength, yield strength, elongation, hardness), and temper verification
•Certificate of Conformance (CoC): supplier certification that material conforms to the specified AMS or equivalent standard
•Heat traceability: aviation regulations (FAA FAR 21, EASA CS-25) require full traceability from the component back to the original production heat
•DFARS compliance: US government contracts typically require aluminum to meet Defense Federal Acquisition Regulation Supplement requirements for domestic melting and production
Non-aerospace applications
For UAV frames, sporting equipment, precision machined prototypes, and other non-regulated applications, commercial-grade 7075-T6 or 2024-T3 with a standard mill certificate is sufficient. The AMS premium is only justified when regulatory compliance requires it. If in doubt about your application's certification requirements, consult your quality team or the applicable regulatory body before placing a material order.

10. Quick Decision Guide: 2024 or 7075?
Use these criteria to determine the correct alloy before requesting a quote.
Choose 2024-T3 or T351 when:
•The component is a tension-loaded structural member subject to cyclic fatigue loading (fuselage skin, lower wing skin, pressure bulkheads)
•Damage-tolerant design is required per FAA or EASA regulations, and slow fatigue crack growth rate is a design parameter
•Fracture toughness is critical — the component must tolerate detectable cracks without catastrophic failure
•The part requires forming before final heat treatment (use 2024-T4 for forming, age to T3 or T81 after)
•Alclad surface protection is acceptable and preferred for weight-efficient corrosion protection
Choose 7075-T6 or T651 when:
•The component is a compression-loaded structure (upper wing skin, wing spars) where static strength governs
•Maximum strength-to-weight ratio is the primary design criterion — UAV frames, precision structural fittings, tooling
•The part will be CNC-machined to tight tolerances from plate stock (use T651 for machined plates)
•High hardness and wear resistance are required alongside strength
•The application is non-aerospace (sporting goods, high-performance consumer products) where the fatigue growth advantage of 2024 is not the governing factor
Choose 7075-T73 or T7351 when:
•The component will be exposed to humid, coastal, or marine atmosphere in sustained tension
•SCC risk must be minimized — landing gear, outdoor structural fittings, fuselage frames in wet zones
•The 12% strength reduction versus T6 is acceptable in the structural analysis
When neither alloy is necessary:
Both 2024 and 7075 are high-cost, specialized alloys. If your application does not require their extreme strength levels, 6061-T6 delivers approximately 310 MPa tensile strength at significantly lower cost and with better weldability, corrosion resistance, and availability. Consider 6061 first for general structural applications before stepping up to 2024 or 7075.

11. Why Source Your High-Strength Aluminum From Us
We supply both 2024 and 7075 aluminum in a full range of tempers and product forms, with the material certification documentation that aerospace and defense procurement requires.
•2024 available in T3, T351, T4, and T81 tempers; sheet, plate, and Alclad sheet
•7075 available in T6, T651, T73, and T7351 tempers; sheet, plate, bar, and extruded shapes
•AMS-certified material available with full MTR documentation, heat traceability, and CoC
•Commercial-grade material available for non-regulated applications at competitive pricing
•Custom dimensions: specify thickness, width, and length and we cut to order
•Export experience across aerospace supply chains in Asia, the Middle East, Europe, and North America
•Fast RFQ response: provide alloy, temper, form, dimensions, quantity, and certification requirements and we will reply within 24 hours with pricing and lead time
Whether you are procurement for an aircraft manufacturer, sourcing material for a UAV development program, or machining precision structural components for defense applications, we have the alloy, temper, and documentation package to support your program.
Contact us today with your specification. We respond promptly.


Welcome to contact us:
Email: [email protected]
Tel: 0086-371-68630632
WhatsApp/WeChat: 0086-13526561516

06/05/2026

1100 vs 3003 Aluminum: Which General-Purpose Alloy Is Right for Your Application?

In the world of general-purpose aluminum, two alloys stand out above all others: 1100 and 3003. Together they account for a significant share of global aluminum flat-rolled product demand. Both are affordable. Both form well, weld well, and resist corrosion effectively. And in many catalogues, they appear side by side at nearly identical prices.
So what actually separates them — and when does the difference matter?
The short answer: 1100 is commercially pure aluminum, chosen when purity, thermal conductivity, or electrical performance is critical. 3003 adds manganese to gain roughly 20% more strength with minimal trade-offs elsewhere. For most general fabrication work, 3003 is the default. For food contact, chemical handling, heat exchangers, and electrical applications, 1100 is often the only correct choice.
This guide compares 1100 and 3003 aluminum sheet across properties, tempers, applications, corrosion behavior, fabrication characteristics, and price — with a practical decision table you can use today.

1. What Makes 1100 and 3003 the Two Most Common General-Purpose Alloys
1100 aluminum is a commercially pure alloy containing at least 99.0% aluminum. The remaining fraction consists of small amounts of copper, silicon, and iron — trace elements that have minimal effect on properties but are present in commercially refined aluminum. 1100 is the softest and most formable wrought aluminum alloy in common commercial use.
3003 aluminum starts with a similar base but adds 1.0 to 1.5% manganese. Manganese is a solid-solution strengthener: it dissolves into the aluminum matrix and restricts dislocation movement, raising strength without significantly affecting corrosion resistance, formability, or weldability. The result is an alloy that behaves very similarly to 1100 in the shop but delivers meaningfully better mechanical performance in service.
Neither alloy responds to heat treatment. Both are strengthened by cold working — the rolling and drawing operations that align the grain structure and increase hardness. This is captured in the H-series temper designations (H12, H14, H16, H18, H24) that appear alongside the alloy number on every mill certificate.
These two alloys cover a wide range of industrial needs: food packaging, chemical storage, building products, HVAC systems, heat exchangers, cookware, and general sheet metal fabrication. Understanding which fits your project is straightforward once you know what separates them.

2. 1100 vs 3003: Full Property Comparison
The table below compares 1100 and 3003 aluminum in the H14 temper — the most common commercial specification for flat-rolled sheet in both alloys.

Property 1100-H14 3003-H14
Aluminum content ≥99.0% Al ≥96.7% Al + 1.0–1.5% Mn
Tensile strength 124 MPa (18 ksi) 152 MPa (22 ksi)
Yield strength 117 MPa (17 ksi) 145 MPa (21 ksi)
Elongation at break ~9% ~8%
Brinell hardness ~32 HB ~40 HB
Thermal conductivity 222 W/m·K — superior 163 W/m·K
Electrical conductivity ~59% IACS ~41% IACS
Density 2.71 g/cm³ 2.73 g/cm³
Corrosion resistance Excellent — highest purity Excellent — Mn improves slightly
Formability Excellent — softest Excellent
Weldability Excellent (ER1100) Excellent (ER4043)
Anodize quality Superior — clearest finish Good — slight tint from Mn
Heat-treatable No (H-series only) No (H-series only)
Food contact compliance Yes — FDA / EU compliant Yes — generally compliant
Relative raw material cost Slightly higher Slightly lower

Two numbers deserve particular attention. First, thermal conductivity: 1100 delivers 222 W/m·K versus 163 W/m·K for 3003 — a 36% advantage. For heat exchanger fins, where thermal efficiency is calculated directly from conductivity, this difference is significant and often decisive. Second, the strength gap: 3003-H14 provides 152 MPa tensile strength versus 124 MPa for 1100-H14. That 20% increase may seem modest, but in roofing and structural panel applications where span length and wind or snow load determine required material thickness, it allows a thinner gauge of 3003 to match the performance of a heavier gauge of 1100 — at lower cost and weight.

3. Temper Guide: H12, H14, H16, H18, H24, and O Explained
Both 1100 and 3003 use the same H-series temper system. The temper number tells you how much cold work has been applied after annealing — and therefore how hard and strong the material is compared to its fully annealed (O temper) baseline.
O temper (fully annealed)
The softest condition. Material has been annealed to relieve all work hardening. Maximum ductility and formability. Used for deep drawing, hydroforming, and any application requiring the tightest bend radii or most complex shapes. Tensile strength for 1100-O is approximately 90 MPa; for 3003-O, approximately 110 MPa.
H12 — quarter hard
Light cold work applied after annealing. Strength rises modestly above O temper while retaining most of the forming capability. Used where some rigidity is needed but significant bending or drawing is still required.
H14 — half hard
The most widely specified temper for general industrial sheet. A good balance of strength and formability. This is the standard specification for roofing sheet, HVAC duct blanks, tank blanks, and general fabrication stock. When a purchase order specifies 1100 or 3003 without a temper, H14 is typically what the supplier ships.
H16 — three-quarter hard
More cold work than H14, higher strength, reduced elongation. Used when a harder surface or higher stiffness is needed in the flat-sheet form, and when forming operations are limited to simple bends.
H18 — full hard
Maximum cold work. Highest strength in the H-series. Lowest ductility — tight bends may crack. Used for flat applications where the sheet is not formed after delivery: shims, liners, stiffening plates.
H24 — work-hardened and partially annealed
Cold-worked to H14 strength but then partially annealed to restore some ductility. A good temper for corrugated roofing sheet, where forming the corrugation profile requires moderate ductility, but the finished panel must retain decent strength. Common for 3003 roofing coil.
When placing an order, always specify both the alloy and the temper. Stating '3003 aluminum sheet' without a temper will result in the supplier's default, which is usually H14 — but confirming this avoids potential disputes on delivery.

4. Where 1100 Aluminum Excels: Purity-Critical Applications
1100 aluminum is the right specification when the physical or chemical properties unique to high-purity aluminum are required. In these applications, 3003 is not a substitute — the manganese addition changes the alloy's behavior in ways that matter.
Food packaging and containers
1100 aluminum is widely used for food containers, foil laminates, bottle caps, and packaging trays. The alloy meets FDA and EU food-contact regulations because it is free from alloying elements that could leach into food or affect taste. 3003 is also generally food-safe, but in applications where regulatory compliance must be documented, 1100 is the cleaner specification. When in doubt, 1100 is the standard choice for food-contact aluminum in global supply chains.
Chemical processing and storage tanks
High-purity aluminum resists a wide range of organic acids, aldehydes, and chemical solvents better than alloyed grades. The 1100 alloy has no manganese, which means there is no risk of manganese-related reactions in sensitive chemical environments. For tank liners, chemical vessel cladding, and equipment used in pharmaceutical or specialty chemical production, 1100 is the preferred specification.
3003 performs well in more common chemical environments such as petroleum products, water, and mild acids — and is used extensively for fuel and oil storage tanks. But for borderline or chemically aggressive environments, 1100 provides a more conservative and lower-risk choice.
Heat exchanger fins
This is arguably the most technically important application for 1100 aluminum. In a fin-and-tube heat exchanger, the aluminum fins conduct heat between the process fluid (in the tubes) and the surrounding air or secondary fluid. Fin efficiency — the fraction of the theoretical maximum heat transfer actually achieved — depends directly on the fin material's thermal conductivity.
1100 aluminum conducts heat at 222 W/m·K. 3003 aluminum conducts at 163 W/m·K. That 36% advantage in conductivity translates directly into better exchanger performance for the same fin mass — or the ability to use thinner fins and reduce material cost while maintaining performance. HVAC coils, refrigeration evaporators, radiators, and industrial process exchangers all benefit from 1100 fins.
Electrical and conductive applications
1100 has an electrical conductivity of approximately 59% IACS (International Annealed Copper Standard), compared to 41% IACS for 3003. For busbars, grounding straps, conductive foils, and any application where electrical resistance matters, 1100 delivers meaningfully better performance. 3003 is not appropriate for electrical applications where conductivity is a design criterion.
Reflective and decorative surfaces
The purer grain structure of 1100 produces a finer, more uniform surface after rolling. This translates to better reflectivity when polished and a cleaner, more transparent anodize film. Applications requiring mirror-finish or high-reflectivity aluminum — lighting reflectors, decorative trim, solar reflectors — specify 1100 for this reason.

5. Where 3003 Aluminum Excels: Strength Plus Versatility
For the majority of general industrial applications, 3003 aluminum is the better default choice. Its 20% strength advantage over 1100 costs virtually nothing in formability, weldability, or corrosion resistance — and it typically comes at a slightly lower price. This combination of properties makes 3003 the most widely used aluminum alloy in flat-rolled products worldwide.
Roofing sheet and wall cladding
Aluminum roofing sheet is one of the largest single applications for 3003. The alloy's superior strength allows roofing sheets to span purlins at wider spacing without deflecting under wind load or concentrated foot traffic. In corrugated or standing-seam profiles, 3003-H24 is the standard specification: the H24 temper provides the ductility needed to form the corrugation profile while retaining enough strength for structural performance.
Both 3003 sheet and 3003 roofing coil are available in a range of thicknesses from 0.3 mm foil gauge up to 6 mm plate. Common roofing thicknesses range from 0.4 mm to 1.2 mm depending on span and loading requirements. The alloy's corrosion resistance makes it suitable for roofing without paint or coating in many environments, though coated or anodized surfaces extend service life further in coastal or industrial atmospheres.
HVAC ductwork and air handling
Sheet metal ductwork for air handling and HVAC systems uses 3003 almost exclusively. The alloy forms cleanly into rectangular and round duct sections, handles the Pittsburgh lock-seam and button punch snap-lock joints used in standard duct fabrication, and seam-welds reliably. Its strength advantage over 1100 allows thinner gauges to meet the stiffness requirements of low-pressure duct systems, reducing both material cost and duct weight.
Storage tanks for liquids
3003-H14 is the industry standard for welded storage tanks handling petroleum products, aviation fuel, kerosene, lubricating oil, and water. The alloy's strength handles internal pressure and hydraulic load from full tanks, while its excellent weldability allows leak-free seam welds using standard MIG or TIG processes with ER4043 filler wire. 3003 tanks are lighter than steel equivalents and require no internal coating for most non-corrosive liquids.
Cookware and kitchen equipment
The cookware industry relies heavily on 3003 aluminum for pots, pans, baking trays, and kitchen equipment. The alloy's greater hardness compared to 1100 produces utensils that resist denting and surface damage better in commercial use. Deep drawing of cookware shapes from 3003-O blanks is a well-established industrial process, and the alloy's food-safe composition meets global food-contact regulations.
General industrial sheet fabrication
For sheet metal work where there is no specific purity or conductivity requirement — brackets, guards, covers, enclosures, trays, signs, and general fabricated parts — 3003-H14 is the default specification. It machines, bends, and welds as easily as 1100 but provides a stronger finished part. In most cases, a part designed in 3003 can use a thinner gauge than the equivalent 1100 design, reducing material cost and weight simultaneously.

6. Application Selection Guide

Application Best alloy Key reason
Food packaging & containers 1100 Highest purity, FDA compliant, no flavor transfer
Chemical tank liners 1100 No Mn — avoids secondary reactions
Heat exchanger fins 1100 222 W/m·K vs 163 W/m·K — 36% better thermal conductivity
Electrical busbars / connectors 1100 59% IACS electrical conductivity
Decorative / reflective panels 1100 Purer surface, cleaner anodize
Deep-drawn parts (O temper) 1100-O Softest grade, best forming
Roofing & wall cladding 3003 20% stronger — better wind/snow load resistance
HVAC ductwork 3003 Strength + formability for complex sections
Liquid storage tanks 3003-H14 Petrol, kerosene, oils — industry standard
Cookware & kitchen equipment 3003 Harder surface, better durability
Vehicle interior panels 3003 Handles vibration loads better than 1100
General industrial sheet 3003 Best overall value — stronger at similar cost
Corrugated roofing sheet 3003-H24 Strength for spanning, ease of corrugating

7. Corrosion Resistance: Both Alloys, Different Environments
Both 1100 and 3003 aluminum form a natural aluminum oxide layer on their surface when exposed to air. This layer is self-healing: if scratched, it reforms within seconds. It provides excellent protection against atmospheric corrosion, most fresh waters, and many chemicals.
Where 1100 has the edge
In environments involving concentrated organic acids, acetic acid, nitric acid, and many organic solvents, 1100 is the safer choice. The absence of manganese means there are no secondary alloying phases that could react differently from the base aluminum matrix. This single-phase character gives 1100 its predictable, well-documented chemical compatibility across a wide range of industrial reagents.
Where 3003 holds its own
In atmospheric exposure, fresh water, petroleum products, and mildly alkaline conditions, 3003 performs as well as 1100 in practical terms. The manganese addition slightly improves resistance to pitting corrosion in some electrolyte solutions. For outdoor roofing, ductwork, and storage tanks, 3003 provides all the corrosion resistance the application requires.
Environments to avoid for both alloys
Neither 1100 nor 3003 is suitable for prolonged exposure to strong alkaline solutions (such as caustic soda / NaOH), hydrochloric acid, or environments with high chloride ion concentrations combined with mechanical stress. For marine immersion applications or continuous seawater exposure, 5###-series alloys such as 5052 or 5083 are the correct specification.

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