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Pipe & Tube

Seamless Steel Pipe

Hot-rolled and cold-drawn seamless pipe, 4–900 mm OD, carbon to nickel alloy.

Carbon steelLow-alloy and heat-resistantAustenitic stainless
Outside diameter4–900 mm
Wall thickness0.5–60 mm, by schedule or drawing
Length5.8 m, 6 m, 11.8 m, 12 m, or cut to length
StandardsGB/T 17395-2008, GB/T 2102-2018, GB/T 5310-2018, GB/T 9948-2018, GB/T 6479-2018, GB/T 18248-2018, ASTM A106 / A335 / A312
EndsPlain, bevelled, threaded with coupling
TestingHydrostatic, UT, eddy current, PMI, mechanical properties

Overview

Seamless pipe has no longitudinal weld, so there is no heat-affected zone running the length of the line and no weld defect to find later. It is the base product behind most of what we supply: cut, bevelled, tested and certified to the project specification.

Range

Outside diameter 4–900 mm, wall thickness by schedule or by drawing; round and shaped sections (square, oval, hexagonal, finned) on request.

Hot-rolled for heavy wall and large diameter, cold-drawn for thin wall and tight tolerance.

Advantages over welded pipe

Uniform stress distribution and 20–30% higher pressure capability at equal wall thickness.

Outside diameter tolerance ±0.2% and wall tolerance within 5% on cold-drawn product.

Materials

  • Carbon steel (20#, 45#, Q345)
  • Low-alloy and heat-resistant (15CrMo, 12Cr1MoVG, T11, T22, T91)
  • Austenitic stainless (304/316L, 321, 310S)
  • Nickel alloys (625, C-276, 800H/HT)

Applications

Boiler and superheater tubingPetroleum cracking and refiningHigh-pressure fertiliser plant pipingGas cylinders and high-pressure vessels
Every shipment can be supplied with an EN 10204 3.1 mill certificate, dimensional report and PMI report. Third-party inspection at SGS, BV or TUV can be arranged on request.
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