The steel bar can be divided into hot rolling, forging and cold drawing. The speicfication of hot rolling steel bar
is from 5.5 to 250mm.
The steel pipe has the hollow section, its length is far bigger than it’s diameter and perimeter. It can be divided
into round, square, rectangle and heteromorphism steel pipe according to the cross-section shape. And
according to different material, it can be divided into carbon structure steel pipe, low alloy structure steel pipe,
alloy steel pipe and complex steel pipe. And it can be divided into seamless steel tube and welded steel tube
according to different manufacturing technology. And seamless tube can be divided into hot rolling and cold
rolling while welded tube divided into straight slit welding and spiral seam welding tube.
