How to distinguish between hot rolled and hot expanded seamless steel pipes
Hot rolled and hot expanded are two common processes for seamless steel pipes. How to distinguish between them? Both hot expanded steel pipes and hot rolled steel pipes have strict requirements on the steel grades used in the manufacture of steel pipes. Hot expanded steel pipes are just a kind of steel pipe manufacturing process, which is to process small-diameter steel pipes into large-diameter steel pipes. Hot expanded steel pipe: first of all, the outside surface is red and the inside surface is lead pink. The steel pipes to be hot expanded have strict requirements on the quality of steel grades. Usually, steel pipes with strong shrinkage properties are used, and a waste pipe finishing rolling process is used to expand the diameter of the pipe by cross-rolling or drawing. In this way, the steel pipe is thickened in a relatively short period of time to produce non-standard and special hot rolled pipes. This kind of hot expanded steel pipe has low cost and h...