When many friends first came into contact with the steel pipe industry, the concept of seamless steel pipe was rather vague. In fact, seamless steel pipe is a kind of welded pipe. It is a steel pipe product produced by heat-treating the welded pipe and removing the weld seam.
Seamless steel pipe is also called hot-rolled seamless steel pipe or hot-rolled steel pipe. On the premise of ensuring the welding quality of the parent pipe, the welded pipe tension reduction process is to heat the welded pipe as a whole to above 950 degrees Celsius, and then roll it through a tension reduction machine. Finished seamless steel pipes of various outer diameters and wall thicknesses are made. The hot-rolled steel pipes produced by this process are essentially different from ordinary high-frequency welded pipes. After being heated by a heating furnace, the weld seam and the metallographic structure of the parent The mechanical properties can be completely consistent. In addition, through multi-pass tension reducer rolling and automatic control, the dimensional accuracy of the steel pipe is better than that of similar seamless pipes.
The seamless steel pipe products comply with API SPEC 5L, API SPEC 5CT, EN10217 standards, and are widely used in flammable and non-flammable fluid conveying pipes, boilers, and steel structures. This is not a fake to deceive consumers, but a steel pipe produced according to the needs of the equipment. The seamless steel pipe is between the pure seamless and the welded pipe. The quality is better than the welded pipe, and the cost is lower than the pure seamless. It is an ideal alternative products.
A large number of seamless welded pipes have been used in the fluid pipes and boiler pipes produced by developed countries in the world. With the development of society, the situation that domestic hot-rolled welded pipes have gradually replaced seamless pipes has formed.
