Main method of straight welded steel pipe

　　Forged: forging hammer use reciprocating impact force or press pressure so we need to change the blank shape and size of a pressure processing method.

　　Extrusion: steel metal is placed in closed extrusion Jane, put pressure on one end of the metal from the die orifice to obtain a predetermined extrusion has the same shape and size of the finished product processing method used for the production of non-ferrous metal steel .

　　Rolling: the metal blank of steel through a pair of gap (of various shapes) rotating rolls, due to compression of the material cross-section roll is reduced, the length of the increased pressure processing method.

　　Pullout: rolled metal blank (type tube, products, etc.) through a die orifice dial into reduced cross-section pulling length increased processing method is used mostly cold.

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