07/10/2024
Seamless steel pipe is an important industrial material, widely used in construction, petroleum, chemical industry, machinery manufacturing and other fields. Here are some key information about seamless steel pipe:
Categories and characteristics
Hot-rolled seamless steel pipe: usually rolled at high temperature, with large deformation, outer diameter greater than 32mm, wall thickness 2.5-200mm.
Cold-rolled seamless steel pipe: produced by cold rolling process, outer diameter can reach 6mm, wall thickness can reach 0.25mm, with high precision.
Material: including ordinary carbon structural steel, low alloy steel, alloy steel, stainless steel, etc.
Application field
Construction industry: used for high-rise buildings, cold storage, roof waterproofing, etc.
Petroleum industry: used for petroleum pipelines, storage tanks, etc.
Chemical industry: used for transporting ammonia, urea, methanol, etc.
Mechanical industry: used for automobiles, tractors and other mechanical parts.
Production process
Blank preparation: round tube billets are cut and heated.
Piercing: using a tapered roller piercing machine.
Rolling: three-roller oblique rolling, continuous rolling or extrusion.
Sizing: The steel pipe is formed by drilling holes with a conical drill.
Cooling: Cooling by water spraying.
Straightening: The steel pipe is inspected after straightening.
Quality inspection: Internal flaw detection, manual selection.
Quality inspection
Chemical composition analysis: Using infrared C-S instrument, direct reading spectrometer, etc.
Geometric dimension inspection: including outer diameter, wall thickness, length, curvature, etc.
Surface quality inspection: including cracks, inner folds, outer folds, etc.
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