High Pressure Boiler Seamless Steel Pipes

1) Standard: GB/T 5310-1985
2) Outer diameter: 25 - 121mm
3) Wall thickness: 2 - 25mm
4) Length:
1) Standard: GB/T 5310-1985
2) Outer diameter: 25 - 121mm
3) Wall thickness: 2 - 25mm
4) Length: 5 - 12m according to customers' requests