Ingot heating → hydraulic punching → reheating → extension → cycle time cold rolling → reheating → sizing → cooling → straightening → pipe cutting → inspection; Ingot heating: 216mm cycle time cold rolling set with a ring type heat treatment furnace, 318mm cycle time cold rolling set with the original design of two ring type heat treatment furnace, Baogang seamless pipe factory to save resources, improved a ring type heat treatment furnace. Hydraulic punching: 216mm is the selection of 10kN hydraulic press punching, ∮318mm with 18kN hydraulic press punching.

Extension: oil casing factory all use two roller type guide plate extension machine. Reheating: the disc heat treatment furnace and the casing coupling cold rolling machine are used respectively, and the reheating furnace is not used. Sizing: Baotou Steel seamless pipe factory are all two roller type 5 frame sizing machine.

The cold bed of the petroleum casing factory is a single chain type cold bed. The specifications and models of the cold rolling unit with 216mm cycle time are ∮114.3 ~ 319mm, and the wall thickness of the casing coupling is 6 ~ 40mm. 318mm cycle time cold rolling unit cold rolling model ∮168 ~ 377mm, wall thickness 6 ~ 40mm. As an oil well pipe, it can produce and process various specifications and models of casing pipe and part of the drill pipe body pipe.