GB 18248 Seamless steel Pipe applied to gas cylinder, high pressure container.
Chemical composition:
| Standard | Grade | Chemical composition | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | P,S | Cu | Ni | Mo | Cr | V | ||
|
GB18248 |
37Mn | 0.34~0.40 | 0.10~0.30 | 1.35~1.65 | ≤0.030 | ≤0.20 | ≤0.30 | / | ≤0.30 | / |
| 34Mn2V | 0.30~0.37 | 0.17~0.37 | 1.40~1.75 | ≤0.030 | ≤0.20 | ≤0.30 | / | ≤0.30 | 0.07~0.12 | |
| 30CrMo | 0.26~0.34 | 0.17~0.37 | 0.40~0.70 | ≤0.030 | ≤0.20 | ≤0.30 | 0.15~0.25 | 0.80~1.10 | / | |
| 35CrMo | 0.32~0.40 | 0.17~0.37 | 0.40~0.70 | ≤0.030 | ≤0.20 | ≤0.30 | 0.15~0.25 | 0.80~1.10 | / | |
Mechanical properities:
| Standard | Grade | TS(MPa) | YS(MPa) | Elongation(%) |
|---|---|---|---|---|
| GB 18248 | 37Mn | ≥750 | ≥630 | ≥16 |
| 34Mn2V | ≥745 | ≥530 | ≥16 | |
| 30CrMo | ≥930 | ≥785 | ≥12 | |
| 35CrMo | ≥980 | ≥835 | ≥12 |
