Comparison Between Seamless Steel pipe and welded steel pipe

　　Welded steel pipe is usually completed by cold rolling, high frequency welding, forming and other processes. It's a kind of sewed pipe. The seamed tube is made of cold rolled sheet and hot rolled coil is used as raw material. Usually the tolerance of wall thickness is very small, and the wall thickness of the whole circumference is very uniform. In addition, Large Diametersteel welded steel pipe can be divided into straight welded steel pipe and spiral welded steel pipe.

　　Seamless steel tube is manufactured at 2200 F high temperature, which belongs to hot rolling. Using continuous casting slab or blooming slab as raw material, a hole is punched out in stainless steel billet, so that the wall thickness of pipeline is uneven and eccentricity is high. So the wall thickness difference of seamless pipe is bigger than that of seamless pipe. There is no welded steel bar on the inner wall of steel pipe.

　　Generally speaking, seamless steel pipes are pulled out directly with ingots, and welded pipes are made of steel rolled and welded.

　　Different performance characteristics

　　Hot-rolled seamless steel tube has low hardness, easy processing and good ductility.

　　Welded steel pipe processing is relatively difficult, but it is not easy to deform. Welded steel pipe with hot rolled coil as raw material will be oxidized for a long time. Friends in the North must have experienced the cold explosion of water pipes or heating pipes in winter. The places where the explosions occurred were usually welded seams.