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    2. Cold Rolled Precision Seamless Steel TubeOur cold rolled precision seamless steel tube comes with outer diameter ranging from 10mm to 220mm, and wall thickness ranging from 0.8mm to 16mm. It has very smooth inner surface and high precision sizes. To illustrate, surface roughness (Ra) of the inner pipe wall can be 0.4, and the dimension tolerance class can be H8 and H9.
    2. Cold Drawn Welded Steel TubeWe can supply quality cold drawn welded steel tube with OD ranging from 21mm to 150mm, and wall thickness ranging from 0.8mm to 6mm.
      Our precision cold drawn steel tubes are produced according to GB3639-2000 strictly.
      Materials can be altered to meet customers' requirements.
    2. Precision Welded Steel TubeThe precision welded steel tube has high size accuracy, and good inner and outer surface roughness properties. The outer diameter of the welded tube ranges from 21mm to 150mm, and the wall thickness ranges from 0.8mm to 6mm.
      GB/T13793 Longitudinal electric resistance welded steel tubes
    2. ERW Steel TubeWe can manufacture our ERW steel tube using materials according to customers' requirement. The material can be SS400, B400QZR, Q235B, and ST37-2, etc.
      The outer diameter of our ERW tube ranges from 10mm to 120mm, and the wall thickness ranges from 0.7mm to 5mm.
    2. Seamless Steel TubeFENGLI seamless steel tube has outer diameter ranging from 4mm to 150mm, and wall thickness ranging from 0.8mm to 15mm.
      Fengli seamless steel tubes are given a series of inspections and tests to ensure quality. The list is given below:
      chemical composition inspection, mechanical properties test (tensile strength, yield strength ...