We have five spiral steel pipe production lines now,we use American Lincon automatic welding machine and on-line X-ray industrial TV test system and untrasonic test machine.Our annual output is 100,000tons. Our spiral steel pipes widely used as structure steel pipe,piling pipe,sewage and drinking water transmission,line pipe for petroleum,gas etc.
we can produce spiral steel pipes comply with standards of SY/T5040-2000, SY/T5037-2000,GB/T9711.1-1997,and API 5L.Outside Diameter: 219 mm to 2850mm,219mm,325mm,508mm,610mm,914mm,965mm are nomal size,Pipe Thickness: 5mm to 26mm (0.236-0.708inch),Steel Grade:ASTM A252 Gr1,Gr2,Gr3, SS400, St37,St52,Q235B,Q345B, API GrA, GrB, X42, X46, X52, X56, X60, X65, X70
Some Standard Tolerance Of Sprial Steel Pipe
| Standards | Outer Diameter Tolerance | Thickness Tolerance | ||
| GB/T | D<50 | ±0.50mm | S<4mm | ±12.5% |
| D≥50 | ±1% | 4-20mm | +158-12.5% | |
| S≥20mm | ±12.5% | |||
| DIN | D50 | ±0.50mm | S2Sn | +158-10% |
| D48.3D48.3 | ±1% | 2SnS4Sn | +12.5/-10% | |
| S4Sn | ±9% | |||
| ASTM A53 | D<48.3 | ±0.4/-0.79mm | ±12.5% | |
| D≥48.3 | ±1% | |||
| ASTM A106 | D<48.3 | ±0.4/-0.79mm | ±12.5% | |
| D48.3-114.3 | ±0.79mm | |||
| D≥114.3 | ±1.59/-0.79mm | |||