Seamless steel pipes for precision structures
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GB/T 8162——Chinese standards
GB/T 3639——Chinese standards
Usage: Used for manufacturing seamless steel pipes for pipelines, containers, equipment, fittings, and mechanical structures
Main production steel pipe grades:10、20、35、45、Q345 Alloy steel, etc
Dimensional tolerance: |
Steel pipe type |
Outside diameter(D) | Steel pipe wall thickness(S) | Cold-drawn pipe
GB/T 8162 | Outer diameter of steel pipe | Allowable deviation | Steel pipe wall thickness | Allowable deviation | (mm) | (mm) | (mm) | (mm) | >30~50 | ±0.3 | ≤30 | ±10% | >50~219 | ±0.8% | GB/T 3639
Cold rolled tube | ≤32 | ±0.08 | | ±10% | 32-40 | ±0.15 | | ±10% | 42-50 | ±0.20 | | ±10% | 50-60 | ±0.25 | | ±10% | 62-670 | ±0.30 | | ±10% | |
Mechanical: |
Standard | Name of shop | Tensile strength
(MPa) | Yield strength
(MPa) | Elongation
(%) | GB/T8162 | 10 | ≥335 | ≥205 | ≥24 | 20 | ≥390 | ≥245 | ≥20 | 35 | ≥510 | ≥305 | ≥17 | 45 | ≥590 | ≥335 | ≥14 | Q345 | ≥490 | ≥325 | ≥21 | 15CrMo | ≥440 | ≥295 | ≥22 | 12Cr1MoV | ≥490 | ≥245 | ≥22 | GB/T 3639
NBK | 10 | ≥335 | ≥205 | ≥24 | 20 | ≥440 | ≥245 | ≥20 | 35 | ≥530 | ≥315 | ≥17 | 45 | ≥600 | ≥335 | ≥14 | |