A detailed description of the hot-rolled pipe production process

Hot-rolled pipe is an important pipe production technology. Hot-rolled pipe heats a solid ingot and then rolls it to produce a seamless hollow pipe. This process is widely used in the production of seamless pipes made of carbon steel, alloy steel, high-alloy steel, and some non-ferrous metals.

 

 

During the production process, outer diameters can range from 16mm to 1600mm, while wall thicknesses can be flexibly adjusted between 2mm and 200mm. In addition to common round-section pipes, various special-shaped and variable-section pipes are also available to meet the needs of different applications.

 

Hot-rolled seamless pipes can be used not only as finished pipes but also as raw material for cold-drawn and cold-rolled pipes. Hot rolling is the dominant method in seamless pipe production, accounting for 80% to 90% of total seamless pipe production.

 

hot-rolled pipe come from a variety of sources, including ingots, continuous castings, rolled billets, forged billets, and hollow castings. These billets undergo basic processes such as piercing, stretching, and finishing rolling to ultimately become seamless pipes. Piercing is the starting point of the entire process and is typically performed on a piercing mill. There are various piercing methods, including two-roll cross-rolling, pressure piercing, push-rolling, and three-mix cross-rolling. Next, the rough tube is thinned on an elongating mill, extending it to a wall thickness close to the finished tube. This process can be accomplished using a variety of methods, including automatic tube mills and continuous tube mills.

 

The final step is to finish rolling on a finishing mill to produce the finished tube. This process includes operations such as leveling and sizing to improve quality, as well as reducing and hot expanding to expand product specifications.

 

hot-rolled pipe production process is an efficient, flexible, and widely used tube production technology, providing high-quality, high-performance seamless tube material for a variety of industries.