化肥设备用高压管GB6479-1986（热轧）
| 尺寸公差 | |||
| 标准 | 尺寸(mm) | 允许偏差 | |
| GB6479-1986 | 外径 | ≤159 | +1.25%，-1.0% |
| >159 | +1.25%，-1.5% | ||
| 壁厚 | 3-20 | +12.5%,-15% | |
| >20 | ±12.5% | ||
| 标准 | 纵向力学性能 | 交货状态 | |||||
| GB6479-1986 | 钢号 | 抗拉强度(MPa) | 屈服强度(MPa) | 延伸率(%) | 冲击(J) | 布氏硬度 | |
| 不小于 | 不大于 | 热轧态 |
|||||
| 10 | 330-490 | 205 | 24 | - | - | ||
| 20 | 410-50 | 245 | 21 | 39 | - | ||
| 12CrMo | 410-560 | 205 | 21 | 55 | 156 | 回火处理 | |
| 15CrMo | 440-640 | 235 | 21 | 47 | 170 | ||
| 1Cr2Mo | ≥(390) | (175) | (22) | (79) | (79) | 回火处理 | |
| 化学成份 | ||||||||
| 钢号 | C | Mn | Si | Cr | Mo | Ni | S | P |
| 10 | 0.07-0.14 | 0.35-0.65 | 0.17-0.37 | ≤0.15 | - | ≤0.25 | ≤0.035 | ≤0.035 |
| 20 | 0.17-0.24 | 0.35-0.65 | 0.17-0.37 | ≤0.25 | - | ≤0.25 | ≤0.035 | ≤0.035 |
| 12CrMo | 0.08-0.15 | 0.40-0.70 | 0.17-0.37 | 0.40-0.70 | 0.40-0.55 | ≤0.30 | ≤0.035 | ≤0.035 |
| 15CrMo | 0.12-0.18 | 0.40-0.70 | 0.17-0.37 | 0.80-1.10 | 0.40-0.55 | ≤0.30 | ≤0.035 | ≤0.035 |
| 1Cr2Mo | ≤0.15 | 0.30-0.60 | 0.50-1.00 | 2.15-2.85 | 0.45-0.65 | ≤0.30 | ≤0.035 | ≤0.030 |