Hot rolled seamless pipe

The process of rolling a heated solid ingot into a hollow tube body with no joints around. Carbon steel, alloy pipe, high alloy steel and some non-ferrous seamless pipe can be produced by hot rolling method, the outer diameter range is 16 ~ 1600mm, the wall thickness is 2 ~ 200mm. In addition to the circular section pipe, there are various shaped section pipes and variable section pipes. In addition to the finished pipe, the hot-rolled seamless pipe can also be used as the pipe material for cold-drawn and cold-rolled pipes. The seamless pipe produced by hot rolling method accounts for 80% ~ 90% of the seamless pipe output.

The tube billets of hot rolling pipe include casting ingot, continuous casting billet, rolling billet, forging billet and hollow casting billet. The basic process of hot rolled pipe is:
(1) The ingot or billet is pierced into a hollow thick wall capillary in the piercing machine. The method of tube blank perforation can be divided into two high skew rolling perforation, pressure perforation, push rolling perforation, three high skew rolling perforation, etc.

(2) The tube is rolled thin on the extension machine and extended into a rough tube close to the wall thickness of the finished tube. The methods of tube extension, or tube rolling, are: automatic tube rolling machine, continuous tube rolling machine, three-high and two-high tube rolling machine diagonal rolling (see tube material rolling extension), periodic tube rolling machine, tube jacking machine. (3) The waste pipe is fine rolled into the finished pipe on the finishing mill. Pipe finishing rolling includes pipe leveling and pipe sizing for the purpose of improving quality, pipe reducing and pipe thermal expanding for the purpose of expanding product specifications.

The production of hot-rolled seamless pipe units can be different according to the production methods and equipment used in the three basic processes of perforation, extension and finishing rolling. The different units are named after the rolling mill that extends the tube into the tube. For example, an automatic pipe rolling machine is called an automatic pipe rolling machine, a continuous pipe rolling machine is called a continuous pipe rolling machine, a three-roll (or two-roll) pipe rolling machine is called a three-roll (or two-roll) pipe rolling machine, a periodic pipe rolling machine is called a periodic pipe rolling machine, and a CPE pipe jacking machine is called a CPE pipe jacking machine.

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