GB/T5312-1999Hot-Rolled, Extruded, and Expanding Seamless Steel Pipes for Shipbuilding
Dimensional Tolerance
Dimensional Tolerance | |||
Outer Diameter (D) | ≤159 | %26gt;159 | |
Outer diameter tolerance | ±1.0% | ±1.25% | |
Wall Thickness (S) | ≤20 | S%26gt;20 | D≥351 |
Permitted deviation of wall thickness | +15%,-10%+0.45mm,-0.30mm) | ±10% | ±15% |
Axial Mechanical Properties
Lateral Mechanical Properties | ||||
Category | Gangji | Tensile Strength (MPa) | Tensile Yield Point (MPa) ≥ | Tensile Extension (%) ≥ |
Carbon Steel and Carbon Manganese Steel | 360 | 360-480 | 215 | 24 |
410 | 410-530 | 235 | 22 | |
490 | 490-610 | 285 | 21 | |
1Cr0.5Mo | 440 | 440-600 | 275 | 22 |
2.25Cr1Mo | 410 | 410-560 | 235 | 20 |
490 | 490-640 | 275 | 16 | |
Chemical composition
Chemical Composition | |||||||||||||
Categories | Steel grade | C | Si | Mn | P≤ | S≤ | Cr | Mo | Ni | Cu | Sn | W | Total |
Carbon steel and Carbon manganese steel | 360 | ≤0.17 | ≤0.35 | 0.40-0.80 | 0.040 | 0.040 | ≤0.25 | ≤0.10 | ≤ 0.30 | ≤ 0.30 | - | - | ≤ 0.70 |
410 | ≤0.21 | ≤0.35 | 0.40-1.20 | 0.040 | 0.040 | ≤0.25 | ≤0.10 | ≤ 0.30 | ≤ 0.30 | - | - | ≤ 0.70 | |
440 | ≤0.23 | ≤0.35 | 0.80-1.50 | 0.040 | 0.040 | ≤0.25 | ≤0.10 | ≤ 0.30 | ≤ 0.30 | - | - | ≤ 0.70 | |
1Cr0.5Mo | 440 | 0.10-0.18 | 0.10-0.35 | 0.40-0.70 | 0.040 | 0.040 | 0.70-1.10 | 0.45-0.65 | ≤ 0.30 | ≤ 0.25 | ≤ 0.03 | ≤ 0.020 | - |
2.25Cr1Mo | 410 | 0.08-0.15 | 0.10-0.35 | 0.40-0.70 | 0.040 | 0.040 | 2.00-2.50 | 0.90-1.20 | ≤ 0.30 | ≤ 0.25 | ≤ 0.03 | ≤ 0.020 | |
