Stainless steel welded pipe manufacturers introduce stainless steel seamless pipes made of a single piece of stainless steel ingot through multiple processes. Steel pipes without any seams on the surface are stainless steel seamless pipes. Stainless steel seamless pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, heat exchanger pipes, bearing pipes, and auto parts, tractor parts, and high-precision structural stainless steel pipes for aviation.

Two common production processes for stainless steel seamless pipes:

1. Main production process of hot-rolled seamless steel tubes (△ represents the main inspection process):

Stainless steel tube blank storage inspection △ → tube blank heating → piercing → rolling tube → seamless tube reheating → setting (reducing) diameter → heat treatment △ → finished tube straightening → finishing → inspection △ (non-destructive, physical and chemical, Taiwan inspection) → Storage

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

Stainless steel billet storage → pickling lubrication → cold rolling (pulling) → heat treatment → straightening → finishing → inspection → storage

Under the fierce competition in the market of stainless steel, in order to save costs, stainless steel seamless pipe manufacturers basically use cold rolling production technology.