1 Main production process of hot-rolled seamless steel pipe (main inspection process):

Tube blank preparation and inspection → tube billet heating → perforation → rolling tube → waste tube reheating → fixed (reduced) diameter → heat treatment → finished tube straightening → finishing → inspection (non-destructive, physical and chemical, Taiwan inspection) → storage

2 cold rolling (drawing) seamless steel pipe main production process

Blank preparation → pickling lubrication → cold rolling (pull) → heat treatment → straightening → finishing → inspection

Hot rolling seamless steel pipe production process flow chart:

Source: China Metallurgical News Agency

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