API 5L Pipe
Grade： L245 or Grade B （PSL1）
Chemical composition:
C: ≤0.28(seamless) ≤0.26(welded)
Mn：≤1.20
P：≤0.030
S: ≤0.030
Cu:≤0.50
Ni：≤0.50
Cr：≤0.50
Mo：≤0.15
*Unless otherwise agreed,V+Nb：≤0.06
*V+Nb+Ti: ≤0.15
*For every 0.01 per cent reduction in carbon content, the manganese content can be increased by 0.05 per cent, up to a maximum of 1.65 per cent.
Mechanical property:
Yield strength:≥245Mpa
Tensile strength:≥415Mpa
Weld tensile strength of welded steel pipes:≥415Mpa
Elongation:≥1940* AXC0.2/4150.9 Where AXC is the cross-sectional area of the tensile specimen
Tolerance of the outer diameter of the steel pipe:
| OD mm | Deviation of outer diameter at the end/mm | |
| Seamless steel pipe | Welded steel pipe | |
| ＜60.3 | -0.8， +0.4 | |
| 60.3≤D≤168.3 | -0.4， +1.6 | |
| 168.3＜D≤610 | ±0.005D, MAX.±1.6 | |
| 610＜D≤1422 | ±2.0 | ±1.6 |
| ＞1422 | According to the agreement | |
Thickness Tolerance of the steel pipe：
| WT mm | Tolerance mm |
| Seamless steel pipe | |
| ≤4.0 | +0.6， -0.5 |
| 4＜t＜25 | +0.150t，-0.125t |
| ≥25 | +3.7 or +0.1t，select-3.0 or -0.1t，select |
| Welded steel pipe | |
| ≤5.0 | ±0.5 |
| 5.0＜t＜15 | ±0.1t |
| ≥15 | ±1.5 |
