Hot rolled seamless tube

Introduction

Seamless steel tubes are a kind of steel pipe without any welding seam on its body which is mainly used for various liquid conveyance, structural support and various mechanical parts. Hot rolled seamless steel tubes, commonly known as water tubes, belong to the category of seamless steel tubes and are made of steel ingots or solid billets through hot rolling, cold rolling or cold drawing process. Compared with the hot-rolled seamless tubes, the hot-rolled seamless steel tubes have better surface quality and tolerance, can be directly used without heat treatment, and have higher dimensional accuracy.

Production process

The production process of hot rolled seamless steel tube is more complex. Generally, it is produced from the solid round steel from the steel mill blank, and then pierced through the hole in the doughnut and driven by the drill rod. The round tube blank obtained by piercing and redrawing is cut into the required length by a special cutting machine, and then sent to a thermal treatment furnace for heat treatment. In the heat treatment process, the round tube blank is heated to the right temperature (according to different material requirements, the temperature is different) in the furnace and then extruded with a steel extruder to improve its physical and mechanical properties. The round tube blank is then either directly formed into a required size tube or cooled and then machined into a required size tube.

Characteristics

The hot rolled seamless steel tube is a hot rolled steel deviated from a round tube blank with a certain thimble, and then a round tube blank is broken or pierced and then rolled, and the main feature of it is that the wall thickness is thicker than that of a cold drawn tube, but the wall thickness is uniform. Its specifications are expressed in terms of outer diameter and wall thickness. In addition, its surface is smooth, bright and beautiful, with no joints and wrinkles. Its performance is compared with the cold drawn tube, which has high precision, good concentricity and high toughness.

Advantages

Hot rolled seamless steel tube has the advantages of good pressure resistance, mechanical properties, thermal conductivity and heat resistance, mainly used for boilers, superheaters and wall panels of conventional weapons. It has good pressure resistance, mechanical properties, thermal conductivity and heat resistance. It can meet the various requirements of mechanical processing and the production of heat transfer components. Hot-rolled seamless steel tubes provide a large number of manufacturers with a wide range of production techniques and savings in material costs.

Conclusion

Hot-rolled seamless steel tubes are widely used in various industries, such as petroleum, chemical industry, medical machinery, construction, agricultural machinery, light industry and boiler, because of their many advantages, such as hot rolling process, uniform wall thickness, strong pressure resistance, good layer defects, high toughness, good concentricity, high dimensional accuracy and so on. Hot rolling is cost effective and can extend the service life of components.

Hot-rolled seamless steel pipe is a kind of precise seamless steel pipe made by hot-rolled process. Its diameter and wall thickness tolerance are much higher than cold-rolled seamless steel pipe. The surface of hot-rolled seamless steel pipe is usually treated by oiling or galvanizing to eliminate the oxidation layer, so that the internal organization of the steel pipe can be clearly seen.

Hot-rolled seamless steel pipe is a kind of rough and ready pipe that is made by rolling the heated steel to the approximate size, and then by the process of annealing and extruding, each end of the steel pipe is cooled and processed at a predetermined temperature and machined. The hot-rolled seamless steel pipe is the most commonly produced and used seamless steel pipe in the manufacturing industry or foundries.

The production procedure of hot-rolled seamless steel pipe is roughly divided into two kinds: hot-rolled and cold-rolled. The difference between them lies in the fact that hot-rolled steel pipes are made from hot-rolled steel strips, while cold-rolled steel pipes are made from cold-rolled steel strips. Hot-rolled steel pipes are generally smoother and stronger than cold-rolled steel pipes. Hot-rolled seamless steel pipes are often subjected to annealing and pickling processes in order to remove scale from its surface.

The hot-rolled seamless steel pipe is widely used in industries such as petroleum, natural gas, coal gas, chemical industry and so on. In petrochemical industry, it is used for pressure vessel, heat exchange tube, etc. In natural gas, it is used for conveying gas and conveying liquids, such as transmission pipes, high pressure steam pipes, heat exchange pipes and pipeline steel pipes. In coal gas, it is usually used for conveying coal gas in coal gas production.

In short, hot-rolled seamless steel pipe has many advantages such as high strength, precision and good surface finish, so it is favored by people in many industries.