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Difference between seamless pipe and welded pipe

mainly reflects in:

 

The difference in production process: the welded pipe is welded by strip steel, and the seamless pipe is perforated with the steel billet and there is no welding point on the pipe.

Different in application: the pressure of the welded pipe is not as high as that of the seamless pipe, the production capacity is different, the production capacity of the seamless pipe is low, and the production capacity of the welded pipe is high. The two pipes of the same type are much more expensive, if the pressure is not required Then choosing a welded pipe will be more economical.

 


The specific reference is as follows:

1) According to the application: the seamless pipe is used for the flow pipe and pressure parts above 0.8MRa; the welded pipe can only be used for the flow pipe and structural pipe below 0.8MRa.

2) According to the source: the seamless pipe is made by perforating the steel billet; the welded pipe is welded by strip steel.

3) According to the value: the price of the seamless pipe is high; the welded pipe is low, and the seamless pipe is higher than the welded pipe .

4) By name: the seamless pipe is directly marked, such as 8"sch10s indicating a diameter of 1 inch, the wall thickness is sch40s; the welded pipe is marked with a nominal diameter (nominal size) "DN XX", such as DN200 indicating a diameter of 219mm, wall thickness, 3.76mm

5),The surface is different. :After the end of the welded pipe production, the inner and outer surfaces of the steel pipe can clearly see the traces of the welding rod on the weld (see the figure below), but the seamless pipe does not.

 

 

 

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