According to different production processes,
seamless steel tubes can be divided into four categories: hot-rolled seamless steel tubes, hot-expanded seamless steel tubes, cold-drawn seamless steel tubes, and cold-rolled seamless steel tubes.
The hot-rolled seamless steel pipe is a round steel that is pierced into a tube blank by a piercing machine, and then the tube blank is customized to the required specification outside diameter through a hot rolling mill, and then formed into a hot-rolled seamless steel tube product. The process is simple and the price is relatively low, but the dimensional precision is not high. Domestic production technology can hot-rolled seamless steel pipes with an outer diameter of 60mm to 600mm.
Hot-expanded seamless steel pipes are formed by using seamless steel pipe blanks or finished seamless steel pipes to be burned to a temperature above 1050 degrees in an electric furnace, and then expanded to a certain outer diameter with an alloy core. After being expanded into a thermally expanded seamless steel pipe, the wall thickness is thinner than the raw material, the length is shortened, and the outer diameter becomes larger.
Cold drawn seamless steel pipe is a seamless steel pipe that is formed by drawing a seamless steel pipe blank or finished seamless steel pipe through the abrasive tool of a cold drawing machine. It coincides with the hot expansion process, and the drawn finished pipe is longer than the raw material. , The wall thickness becomes thinner and the outer diameter becomes smaller. The drawing process does not require heating, and it can be formed at room temperature, and it can also be re-annealed. Sometimes annealing is not necessary.
The cold rolling process is also produced at room temperature like the cold drawing process, but the cold rolling mill is different from the cold drawing machine. The cold drawing machine is formed by a mold, and the cold rolling mill is gradually formed by the abrasive tool, so the cold rolling process Production is slower than cold-drawn process production.
Tips: ASTM A53 ERW steel pipe is a typical carbon steel pipe. It is largely used to convey fluids at low / medium pressures such as oil, gas, steam, water, air and also for mechanical applications.
