The difference between welded steel pipe and seamless steel pipe
Seamless steel pipe
Seamless steel pipe (SMLS) is formed by drawing a solid billet over a piercing rod to create the hollow shell, without welding or seam.It is suitable for bending and flanging. The most advantage is increasing the ability of withstanding higher pressure.Seamless steel pipe can be cut,threaded or grooved.And the coating method includes black/ red lacquer,varnish painting,hot dip galvanization,etc.
Welded steel pipe:
Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.
There are the difference between welded steel pipe and seamless steel pipe:
Different appearances: welded steel pipe has welding line on the inner wall of welded pipe, but seamless steel pipe does not have.
Pressure is different: welded steel pipe has about 10 MPa, while seamless steel pipe has higher pressure.
Different processing technologies:
Seamless pipe is made of high quality carbon steel or alloy steel. The processing technology of seamless pipe can be divided into two main methods: cold drawing and hot rolling, while welded pipe is usually made of rolled steel plate welded by butt seam or spiral seam.
Seamless pipes are mainly used as pipes or structural parts for conveying fluids, mainly used in machinery industry, while welded pipes are mainly used in construction industry, conveying low-pressure fluids such as water, gas, compressed air, etc. However, seamless steel pipes are used in pressure pipes.
Prices are different:
Because of the complex manufacturing process of seamless steel tube, the price is more expensive than that of welded steel tube. Welded steel tube is mainly made of steel plate (steel strip) through secondary welding, which is cheaper and widely used.
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