01/03/2025
High-Pressure Boiler Tubes in Boiler and Power Plant Construction
The manufacturing of boilers and er****on of power plants necessitate extensive quantities of high-pressure boiler tubing. Critical applications include steel grades for boiler drums, internal steam-water circuits (superheaters, reheaters, water wall panels, economizers), and external steam-water systems (headers, main coolant lines). Cold Drawn Internally Multi Lead Rifled Steel Tubes are predominantly utilized in water wall panel circuits, specifically integrated into the water wall panel assemblies of boilers.
Functional Role of Water Wall Panels
Water wall panels are engineered to convert feedwater into high-temperature steam. Their operational mechanism involves circulating coolant through the tubes to absorb heat flux from the furnace, with the heated coolant transitioning into steam. These panels are directly exposed to post-combustion flue gases, enduring extreme radiative and convective heat transfer. Restricted steam flow or bubble adhesion to tube surfaces can degrade thermal efficiency, inducing localized overheating. Mild cases reduce service life and increase maintenance downtime, while severe scenarios risk tube wall rupture, water ingress into combustion zones, and catastrophic boiler failure.
The adoption of Cold Drawn Internally Multi Lead Rifled Steel Tubes addresses these challenges. The multi-lead helical rifling on the inner surface disrupts laminar flow patterns, inducing turbulent flow within the steam-water mixture. This turbulence eliminates stagnant v***r films (a phenomenon termed film boiling), enhances heat transfer uniformity, and prevents localized thermal stress, thereby mitigating tube burnout risks.
Material Innovations in Subcritical/Supercritical Boilers
Modern subcritical/supercritical pressure boilers (≥300 MW) align with global benchmarks in capacity and steam parameters, often leveraging design expertise from international boiler OEMs. Elevated operational conditions (temperature/pressure) demand advanced materials:
Applying Material Specifications:
SA-209M,SA-210M,SA-213M,
Details :
ASME SA-209（T1 , T1a , T1b）
ASME SA-210（A1 , C）
ASME SA-213（T2 , T5 , T9 , T11 , T12 , T22 , T23 , T24 , T91）
EN Standard :EN10216-2
Carbon steel :P235GH P265GH
Moly steel :16Mo3
Alloy steel :10CrMo55 13CrMo4-5 10CrMo9-10
Chinese GB Standard :
Carbon steel :20G ,20MnG , 25MnG
Moly steel:16MoG
Alloy steel:12CrMoG,15CrMoG 12Cr1MoVG
Produce Process : Cold Drawn Ribbed Tube
Size ：OD：Φ22mm~Φ82.6mm；WT：4.0mm~16.0mm
Ribs QTY: 4Ribs ,6ribs , 8ribs ,12ribs , 14ribs
Structural Optimization: A paradigm shift from smooth-bore tubes to Cold Drawn Internally Multi Lead Rifled Steel Tubes enhances thermal efficiency and fatigue resistance in water wall panels.
These rifled tubes are manufactured via precision cold-drawing processes to create helical protrusions, optimizing fluid dynamics for high-heat-flux environments.
Adoption Trends in China’s Power Sector
China’s recent thermal power installations focus on high-efficiency, low-emission units (300 MW, 600 MW subcritical/supercritical configurations). All newly commissioned systems employ internally rifled seamless tubes for water wall panels. Boiler manufacturers are increasingly adopting this technology due to its 3–5x lifespan extension and superior thermal performance compared to conventional smooth tubes. Market adoption is projected to grow exponentially, driven by its critical role in next-generation boiler design.
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