Xi'an New Force Energy Engineering Co.,Ltd
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| Pipe types | Outer-caliber(D) | Thickness(S) | ||
| pipes | Pipe outer-caliber(mm) | Allowable warp(mm) | Pipe thickness(mm) | Allowable warp(mm) |
| φ559 | ±1.0％ | 17.0 | －0％,＋25 | |
| Standards | Steel pipes No. | Tensile strength(MPa) | Bend strength(MPa) | Bend ratio | Elongation(％) | Impact energy Akv(J) | Hardness |
| Q/321088HGB3 | 4130X | 725～865 | 485～735 | ≤0.85 | ≥20 | －40℃≥40 | 195～269HB |
| Standards | Steel pipes No. | Chemical composition(%) | |||||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | ||
| Q/321088HGB3 | 4130X | 0.25～0.35 | 0.15～0.35 | 0.40～0.90 | ≤0.020 | ≤0.010 | 0.80～1.10 | ≤0.25 | ≤0.20 | 0.15～0.25 | ≤0.08 |