Large seamless steel pipe Seamless steel pipes with small outer diameters can be copied as small-diameter seamless steel pipes. Small-diameter seamless steel pipes can also be divided into: seamless small-diameter steel pipes and straight seams (also known as welding). Seam steel pipes are generally

①Main production process of hot-rolled seamless steel pipe (main inspection process):Tube billet preparation and inspection → tube billet heating → perforation → pipe rolling → steel pipe reheating → fixed (reduced) diameter → heat treatment △ → finished pipe straightening → finishing → inspection (