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According to production method
Steel production methods can be divided into two broad categories: seamless and welded steel pipes, pipe joints straight seam steel pipe for short. 1. seamless steel tube production method can be divided into: hot-rolled seamless pipes, cold drawn pipes, precision steel pipes, thermal expansion tubes, cold spinning tube and squeezing the tube. Seamless steel pipe made of high quality carbon steel or alloy steel, hot-rolled, cold-rolled (drawn) of the points.
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