The production process of general seamless steel pipes can be divided into two types: cold-drawn and hot-rolled. The production process of cold-rolled seamless steel pipes is generally more complicated than hot-rolled.

1.     The main production processes of hot-rolled seamless steel pipes:

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

2.     Main production process of cold rolled (drawn) seamless steel pipe:

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