石油裂化用无缝钢管
●标准：GB9948---------中国国家标准
●用途：适用于石油精炼厂的炉管、热交换器管和管道用无缝钢管。
●主要生产钢管牌号:10、20、12CrMo 、15CrMo、1Cr2Mo、1Cr5Mo、1Crl9Ni9、1Crl9Ni11Nb等经协商，也可供应其它牌号的钢管。
●尺寸偏差 Deviation
| 钢管种类 | 钢管尺寸 | 允许偏差 | |
| 热轧管 | 外径 | ≤ 159 | ± 1.00% |
| > 159 | ± 1.25% | ||
| 壁厚 | ≤ 20 | ± 12.5% | |
| > 20 | ± 10.0% | ||
| 冷拔管 | 外径 | ≤ 30 | ± 0.20 |
| 30~50 | ± 0.30 | ||
| > 50 | ± 0.8% | ||
| 壁厚 | ≤ 3 |
+ 12% － 10% |
|
| > 3 | ± 10% | ||
●机械性能：
| 牌 号 | 抗拉强度(Mpa) | 屈服强度(Mpa) | 伸长率(%) | 冲击功(J) |
| 10 | 330～490 | ≥205 | ≥24 | / |
| 20 | 410～550 | ≥245 | ≥21 | ≥39 |
| 12CrMo | 410～560 | ≥205 | ≥21 | ≥55 |
| 15CrMo | 440～640 | ≥235 | ≥21 | ≥47 |
| 1Cr2Mo | ≥390 | ≥175 | ≥22 | ≥92 |
| 1Cr5Mo | ≥390 | ≥195 | ≥22 | ≥92 |
| 1Cr19Ni9 | ≥520 | ≥205 | ≥35 | / |
| 1Cr19Ni11Nb | ≥520 | ≥205 | ≥35 | / |
●化学成分：
| 牌 号 | C | Si | Mn | P | S | Cr | Mo | Ni |
| 10 | 0.17～0.24 | 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 |
| 12CrMo | 0.08～0.15 | 0.17～0.37 | 0.40～0.70 | ≤0.035 | ≤0.035 | 0.40～0.70 | 0.40～0.55 | ≤0.30 |
| 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 | ≤0.035 | 2.15～2.85 | 0.45～0.65 | / |
| 1Cr5Mo | ≤0.15 | ≤0.50 | ≤0.60 | ≤0.035 | ≤0.035 | 4.00～6.00 | 0.45～0.60 | ≤0.60 |
| 1Cr19Ni9 | 0.04～0.10 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.035 | 18.00～20.00 | / | 8.00～11.00 |
| 1Cr19Ni11Nb | 0.04～0.10 | ≤1.00 | ≤2.00 | ≤0.035 | ≤0.035 | 17.00～20.00 | / | 9.00～13.00 |
生产产品：