seamless steel pipe manufacturing
Passed the API certification and ISO 9001-2000 certification.
The seamless steel tube with the brand of"hongling" produced by the company is the most famous brand products of China.
The raw materials are carbon steel and alloy steel.
Standard : GB3087 GB/T8162 GB/T8163 GB/T17396 API SPEC 5CT
ASTM A53 ASTM A106 ASTM A179 DN1629 EN10297 EN10255
The steel grade: 10# 20# 35# 45# 16Mn 45Mn2 27SiMn 40Cr etc.
The products includes:the tubes for structural purpose,fluid transportation tubes,the alloy tubes,the boiler tubes,tubes for hydraulic cylinders,the tubes for petroleum well,and so on.
| seamless steel tubes for low and medium pressure | |||
| Pipe types | Pipe size (mm) | Tolerance(Standard) | |
| Hot rolled | OD | ≤159 | ±1%(Min±0.50mm) |
| ＞159 | ±1.0% | ||
| WT | ≤20 | +15% -12.5%(Min＋0.45mm－0.35mm) | |
| ＞20 | ±12.5% | ||
| Cold drawn | OD | 10--30 | ±0.40mm |
| ＞30--50 | ±0.45mm | ||
| ＞50 | ±1% | ||
| WT | ＜1.5-3.0 | +15% -10% | |
| ＞3 | +12.5% -10% | ||
| tubes for structural purposes | |||
| Pipe Types | Pipe Size (mm) | Tolerance(Standard) | |
| Hot rolled | OD | ＜50 | ±0.50mm |
| ≥50 | ±1% | ||
| WT | ＜4 | ±12.5%(Min±0.40mm) | |
| ≥4－20 | +15%-12.5% | ||
| ＞20 | ±12.5% | ||
| Cold drawn | OD | 6--10 | ±0.20mm |
| 10--3 | ±0.40mm | ||
| 30--5 | ±0.45mm | ||
| ＞50 | ±1% | ||
| WT | ±1 | ±0.15%mm | |
| ＞1－3 | +15% -10% | ||
| ＞3 | +12.5% -10% | ||
| seamless steel tubes for liquid service | |||
| Pipe Types | Pipe Size (mm) | Tolerance(Standard) | |
| Hot rolled | OD | All | ±1%(Min±0.50) |
| WT | All | ±15% -12.5%(Min±0.45-0.4) | |
| Cold drawn | OD | 6--10 | ±0.20mm |
| 10--3 | ±0.40mm | ||
| 30--5 | ±0.45mm | ||
| ＞50 | ±1% | ||
| WT | ±1 | ±0.15%mm | |
| ＞1－3 | +15% -10% | ||
| ＞3 | +12.5% -10% | ||
