Description of goods:
| Standard | ASTM A106, ASTM A53, API 5L Gr.B, DIN17175,DIN1629, |
| Material | ASTM A106B, ASTM A53B, ST52, ST37,ST44,ST45..... |
| Outer diameter | 20mm-610mm |
| Wall thickness | 2mm-60mm |
| Length | 3-12m, random or fixed, as the clients' requests |
| Technology | Cold draw/Cold rolled / Hot rolled |
| Tolerance | Control with in the standard, OD:+-1%, WT:+-10% |
| Advantages | 1.Short delivery time |
| 2.Quality assurance | |
| 3.Competitive price | |
| 4.Superior Service |



OD Tolerance
Name | Scope (mm) | GB series (mm | DIN series (mm) | Enterprise internal control standard(mm) | Special high-precision (mm) |
4-30 | ±0.1 | ±0.08 | ±0.05 | ±0.03 | |
| 31-40 | ±0.15 | ±0.15 | ±0.05 | ±0.03 | |
| 41-50 | ±0.20 | ±0.20 | ±0.08 | ±0.03 | |
| 51-60 | ±0.25 | ±0.25 | ±0.08 | ||
| 0.5-7 | ±10% (MIN)±0.12 | ±10% | ±10% (MIN)±0.05 | ±10% (MIN)±0.03 |