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鋼管種類 | 外徑(D) | 鋼管壁厚(S) | ||
冷拔管 | 鋼管外徑(mm) | 允許偏差(mm) | 鋼管壁厚 (mm) | 允許偏差(mm) |
>30~50 | ±0.3 | ≤30 | ±10% | |
>50~219 | ±0.8% | |||
熱軋管 | >219 | ±1.0% | >20 | ±10% |
標(biāo)準(zhǔn) | 牌號(hào) | 抗拉強(qiáng)度(MPa) | 屈服強(qiáng)度(MPa) | 伸長(zhǎng)率(%) | 沖擊功(J) | 布氏硬度(HB) | 交貨狀態(tài) |
GB9948 | 10 | 330~490 | ≥205 | ≥24 | / | / | 正火 |
20 | 410~550 | ≥245 | ≥21 | ≥39 | / | 正火 | |
15CrMo | 440~640 | ≥235 | ≥21 | ≥47 | ≤170 | 正火加回火 | |
1Cr2Mo | ≥390 | ≥175 | ≥22 | ≥92 | ≤179 | 正火加回火 | |
1Cr5Mo | ≥390 | ≥195 | ≥22 | ≥92 | ≤187 | 退火 |
標(biāo)準(zhǔn) | 牌號(hào) | 化學(xué)成分(%) | |||||||
C | Si | Mn | P | S | Cr | Mo | Ni | ||
GB9948 | 10 | 0.07~0.14 | 0.17~0.37 | 0.35~0.65 | ≤0.035 | ≤0.035 | ≤0.15 | / | ≤0.25 |
20 | 0.17~0.24 | 0.17~0.37 | 0.35~0.65 | ≤0.035 | ≤0.035 | ≤0.25 | / | ≤0.25 | |
15CrMo | 0.12~0.18 | 0.17~0.37 | 0.40~0.70 | ≤0.035 | ≤0.035 | 0.80~1.10 | 0.40~0.55 | ≤0.30 | |
1Cr2Mo | ≤0.15 | 0.50~1.00 | 0.30~0.60 | ≤0.035 | ≤0.030 | 2.15~2.85 | 0.45~0.65 | / | |
1Cr5Mo | ≤0.15 | ≤0.50 | ≤0.60 | ≤0.035 | ≤0.030 | 4.00~6.00 | 0.45~0.60 | ≤0.60 |
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