Hot rolled carbon steel seamless steel pipes with API 5L standards.

Inferior seamless steel tube is easy to scratch, as the fake seamless steel tubes manufacturers' equipments are poor ,then it's easy to produce burr and scratch the surface of steel. Deep scratches to reduce the strength of the steel.
For reference.
Specifications :

Steel grades:A53,A106,A519,SA192,A179.
            Gr.B,X42,X46,X56,X65,X70,X80 and more.
Outer diameter:10.3mm to 762mm.
              DN8 to DN650
             1/8 to 42 inches.
Wall thickness:2mm to 60mm.
Pressure: Sch5s ,SCH10,SCH15,SCH40,STD,SCH100,SCH160,XXS.
Length:Random length, Fixed length
              normally 4~16m.
Surface treatment:Galvanized or customized,3PE,Varnish coating,
                                  black oil painting,rust-proof painting and more.
Usage:apply to the general structure,engineering support,mechanical processing etc.

Seamless steel pipe used

1. Construction are: pipeline under most more, ground water, hot water boiler used when building and so on.

2. Mechanical processing, bearing sleeve, processing machinery parts, etc.

3. The electrical class: gas pipeline, water electricity fluid.

4. Wind farms anti-static tube, etc.

The process :

Tube billet heating - inspection - skin - - - perforation, pickling, grinding, dry lubrication, welding head, cold drawing, solid solution treatment, pickling, pickling passivation - inspection - cold rolled - oil - cutting head - dry - polishing, polishing, inspection, identification, finished product packaging
dentification method TWO about thequality of seamless steel pipes :