The ERW steel pipe is also known as straight joint pipe. According to the wall density, the bonded tube is categorized into typical types and thick-walled types. We can offer items with personalized wall thickness according to customers’ particular requirement with a thickness deviation of no more than 0.25 mm.
With sizes between 1/2 inch and 24 inch, our ERW steel pipes go through rigorous examinations and tests, so about make sure the welding quality, external size precision, ovality, cut lengths, pipe end quality, wall density tolerance, and packaging quality are all conforming to API5L, ASTMA53, GB/T9711.1, or GB/T3091 standards. Also, we can make the item according to the standard needed by customers. Youfa is the greatest welded steel pipe producer in China and our designed annual production capability of straight joint tubes is 3.5 million tons.
Size Range: 1/2 inch ~ 24 inch (21.3 ~ 610mm).
Wall Thickness: 0.5 ~ 16mm.
Requirement: API 5L, ASTM A53, GB/T9711.1, GB/T3091.
Steel Grade: GR.A, GR.B, X42, X46, X52, X56, X60, X65, X70.
End surface: Plain end, bevel end, thread, coupling, plastic cap.
Pipe finish: Black vanish, bare, clear oil.
2. Strip Leveling.
3. End Cutting.
4. End Shearing and Welding.
7. Induction Welding.
8. Joint Heat Treatment.
9. air/Water Cooling.
10. Seam/Body UT.
11. Straightening and sizing.
13. Visual and Dimension Inspection.
14. Hydrostatic Test.
15. End Facing and Chamfering.
16. Flattening Testing.
18. Length-Measuring and Weighing.
19. Seam/End UT.
The ERW steel pipe is also understood as straight seam pipe. According to the wall density, the bonded tube is categorized into common types and thick-walled types. We can offer items with customized wall density according to customers’ specific requirement with a thickness discrepancy of no more than 0.25 mm.
With sizes between 1/2 inch and 24 inch, our ERW steel pipes undergo strict inspections and tests, so as to make sure the welding quality, external diameter accuracy, ovality, cut lengths, pipe end quality, wall thickness tolerance, and packaging quality are all conforming to API5L, ASTMA53, GB/T9711.1, or GB/T3091 requirements. Youfa is the greatest welded steel pipe maker in China and our designed yearly production capacity of straight joint tubes is 3.5 million tons.
|Out Diameter||1/8 inch to 24 inch|
|Wall Thickness||max 26.5mm|
Tolerance of Outside Diameter
|Standard||Out Diameter||Tolerance of Pipe End||Tolerance of Pipe Body|
|API 5L||219.1～273.1||+1.6mm, -0.4mm||±0.75%|
Tolerance of Wall Thickness
|Standard||Grade||Out Diameter||Wall Thickness|
|API 5L||A||219.1～457||+15%, -12.5%|
Chemical Analysis and Mechanical Properties
|Standard||Class||Grade||Chemical Analysis(%)||Mechanical Properties(min)(Mpa)|
|C||Mn||P||S||Tensile Strength||Yield Strength|