What is the manufacturing process of Seamless Steel Pipe?

As a Seamless Steel Pipe Supplier, share with you.

1. Hot rolling (extruded seamless steel pipe): round pipe billet → heating → perforation → three-roll oblique rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → straightening → hydraulic test (Or flaw detection) → mark → storage

The raw material for rolling the Seamless Steel Pipe is a round tube blank. The round tube blank is cut into a billet with a length of about 1 meter by a cutting machine and sent to a furnace for heating by a conveyor belt. The billets are sent to a furnace for heating to a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a key issue. After the round tube billet is discharged, it is pierced through a pressure perforator. Generally, the more common punching machine is a tapered roller punching machine. This punching machine has high production efficiency, good product quality, large perforation diameter expansion, and can wear a variety of steel types. After perforating, the round tube blank is successively rolled by three rolls, continuously rolled or extruded. After extrusion, sizing is required. The sizing machine rotates into the steel embryo to drill holes at high speed through a conical drill to form a steel pipe. The inner diameter of the steel tube is determined by the outer diameter of the drill of the sizing machine. After sizing, the steel pipe enters the cooling tower and is cooled by water spray. After cooling, the steel pipe is straightened. After being straightened, the steel pipe is sent by a conveyor belt to a metal flaw detector (or hydrostatic test) for internal flaw detection. Problems such as cracks and bubbles inside the steel tube will be detected. After the quality inspection of the steel pipe, it must be strictly selected by hand. After the quality inspection of the steel pipe, spray paint with the number, specifications, production batch number, etc. And lifted into the warehouse by a crane.

2. Cold drawn (rolled) seamless steel pipe: round pipe billet → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → billet pipe → heat treatment → straightening → Hydraulic test (detection) → Marking → Storage.

Alloy Seamless Steel Tubes

The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than hot rolling (extruded seamless steel pipe). The first three steps of their production process are basically the same. The difference starts from the fourth step. After the blank tube has been emptied, it must be started and annealed. After annealing, a special acid liquid is used for pickling. After pickling, apply oil. Then it is followed by multiple passes of cold drawing (cold rolling), and then special heat treatment. After heat treatment, it is straightened.

Our company also has Alloy Seamless Steel Tubes on sale, welcome to consult.