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 (

Before installing the steel pipe, the trench needs to be dug, and the soil dug after the trench has a reasonable stacking place, the excavated earth should be transported to the outside in time, and should not be too close to the trench, there must be two The distance above the meter, so as not to a