large diameter seamless pipe means outside diameter more than 100mm and the wall thickness is greater 0.2 than the outer diameter of the pipe, large-diameter seamless steel tube is made from solid tube ingot or the perforation capillary, then through hot rolling and cold rolling or cold di

generally, those with an outer diameter of less than 89mm and more than 4mm can be collectively referred to as small-diameter seamless pipes. the main production process of small-diameter hot-rolled seamless steel pipes includes several basic processes such as billet pre-rolling preparation, pipe bi

the materials produced by seamless pipes are different, and the elements are naturally different. generally speaking, our seamless steel pipes are not easy to rust. but it doesn't mean that the seamless steel pipe is not easy to rust, we usually don't care about it, because if the seamless steel pip

according to different conditions, the metal material is heated to a suitable temperature and kept warm, and then cooled in different ways to change the metallographic structure of the metal material and obtain the required structural properties. this process is usually called metal material heat tr

the chemical composition of the seamless tube is one of the important factors related to the quality of the steel and the end-use performance, and it is also the main basis for the preparation of the steel and even the heat treatment system of the final product. therefore, in the technical requireme