①Hot-rolled seamless steel pipe main production process (the main test proess):

Tube blank preparation and inspection → tube heating → perforation → rolling pipe → reheating reheating → fixed (minus) diameter → heat treatment → finished pipe straightening → finishing → inspection (lossless, physical and chemical, Taiwan inspection) → storage

②The main production process of cold - rolled (pull) seamless steel pipe

Ingredients → Pickling Lubrication → Cold Rolling → Heat Treatment → Straightening → Finishing → Inspection

Hot - rolled seamless steel pipe production process flow chart