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 |