Production technology of seamless steel pipe

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


Preparation and inspection of tube blank → tube heating → piercing → tube rolling → heating and reheating → fixing (negative) diameter → heat treatment → straightening of finished tube → finishing → inspection (nondestructive, physical and chemical, Taiwan inspection) → storage


② Main production process of cold rolled (drawn) seamless steel tube


Batching → pickling and lubrication → cold rolling → heat treatment → straightening → finishing → inspection


Hot rolling process flow chart of seamless steel tube.