Seamless steel pipes in large calibers for gas cylinders
ASTM A519 —— American Materials and Testing institution standards
For the Seamless steel pipes in large calibers for gas cylinders
Steel pipes No. of main production:
Dimensional tolerance:
| 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 |
Mechanical Properties:
| 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 |
Chemical composition:
| 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 |