船舶用無縫鋼管
GB/T5312-1999（熱軋、擠壓、擴管）船舶用無縫鋼管
尺寸公差
尺寸公差 | |||
外徑(D) | ≤159 | %26gt;159 | |
外徑允許偏差 | ±1.0%(最小為±0.5mm) | ±1.25% | |
壁厚(S) | ≤20 | S%26gt;20 | D≥351 |
壁厚允許偏差 | +15%,-10%(最小為+0.45mm,-0.30mm) | ±10% | ±15% |
縱向力學性能
縱向力學性能 | ||||
類別 | 綱級 | 抗拉強度(MPa) | 屈服點(MPa)≥ | 延伸率（%）≥ |
碳鋼和碳錳鋼 | 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 | |
化學成分
化學成份 | |||||||||||||
分類 | 鋼級 | C | Si | Mn | P≤ | S≤ | Cr | Mo | Ni | Cu | Sn | W | 總量 |
碳鋼和 碳錳鋼 | 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 | - |
二維碼1 
二維碼2 
13502010728