Standard of N-STEEL Line Pipe
API 5L B, B/X42/52/X60/X70/X80 PSL 1/ PSL 2
ASTM A53/ ASTM A106, B/C
Pipe Types | Size (mm) | Permissible Deviation | ||
Common Level | High Level | |||
Hot-rolled Pipe | OD | All | ± 1% (Min.: ± 0.50mm ) | - |
Wall Thickness | All | ±12.5% (Min.: 0.45/ -0.40 mm ) | - | |
Cold-drawn Pipe | OD | 6 ~ 10 | ± 0.20 mm | ± 0.15 mm |
> 10 ~ 30 | ± 0.40 mm | ± 0.20 mm | ||
> 30 ~ 50 | ± 0.45 mm | ± 0.30 mm | ||
> 50 | ± 1% | ± 0.8% | ||
Wall Thickness | ≤ 1 | ± 0.15 mm | ± 0.12 mm | |
> 1 ~ 3 | 15% -10% | 12.5% -10% | ||
> 3 | 12.5% -10% | ± 10% |