Seamless steel pipes, as one kind of the most important steel pipes, are often seen to be widely used in fluid transport, oil field, natural gas, constructions, shipbuilding, machinery, chemical industry, electricity industry etc.

There are mainly 2 types seamless steel pipes as per production technology: Hot Rolled Seamless Pipe & Cold Rolled Seamless Pipe

For hot rolled seamless pipe, the production process is: steel billet---heating---punching---three-roll cross rolling, continuous rolling –--detaching pipe---sizing or reducing---cooling---straightening- --hydrotest (NDT)- --marking---warehouse entry

Specification Range:

1 OD: 3''-24'' (73mm-610mm)

WT: SCH10-SCHXXS

2 Materials: 10#, 20#,45#, 20G,16Mn, GRB, Q345B, X42-56, ST44, ST52，S355 etc.

3 Standards: GB/T8162/8163/3087/5310, ASME B36 10, ASTM A106/A53, API 5L/5CT, DIN2448/1629, EN10210/10219

4 Testing: Eddy current, Hydrostatic, Ultrasonic, Intergranular corrosion etc.

5 Packing: in bundles with steel strips, seaworthy packing as per customer's requirements

For cold rolled seamless pipe, the production process is: steel billet---heating---punching---head making---annealing---cooper plating---cold drawing (cold rolling)---semi-finished pipes---heat treatment---straightening---hydrotest(NDT)---Marking---warehouse entry

1 Specification range:

OD: 1/8''-5'' (10.3mm-141.3mm)

WT: SCH10-SCHXXS

2 Materials: 10#, 20#,45#,16Mn, GRB, Q345B, X42-56, ST44, ST52 etc.

3 Standards: GB/T8162/8163/3087/5310, ASME B36 10, ASTM A106/A53, ASTM A179, API 5L/5CT, EN10210/10219

4 Testing: Eddy current, Hydrostatic, Ultrasonic, Intergranular corrosion etc.

5 Packing: in bundles with steel strips, seaworthy packing as per customer's requirements

The largest benefit to using seamless steel pipe is the increased pressure ratings. When steel pipe is rolled and welded, the weakest point in the pipe is the welded seam. A seamless steel pipe does not have a seam, so the tensile strength is uniform around the entire circumference of the pipe. Steel pipe has nominal pressure ratings that are based on the tensile strength of the alloy (mixture of metals) and the wall thickness of the pipe. Using seamless pipe is more expensive but allows for smaller wall thicknesses and pipe weight, which can affect design and costs.