1. Natural aging elimination of residual stress Natural aging is a method to stabilize the dimensional accuracy of parts by exposing them outdoors for several months to several years. A large number of experiments and production practice have proved that natural aging has good effect in stabilizing the dimensional accuracy of castings.

Thick-walled seamless steel pipe is a common type of thick-walled seamless steel pipe. It is a special material for thick-walled steel pipe. For thick-walled seamless steel pipe, it is more important to protect the most basic use and play. More important performance. Thick-walled seamless steel pipe

In life, many people know the steel pipe and know the existence of a seamless steel pipe. But for seamless steel pipes, many people are limited to knowing this steel. Then let's talk about the understanding of seamless steel pipes. This is a hollow interface with no seam marks on each perimeter. The

Seamless steel tubes are divided into hot rolling and cold rolling seamless steel tubes. Hot-rolled seamless steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geo

Among the many pipe materials, the most practical one is the seamless steel pipe. This is a more powerful pipe material, not only because of the wide range of fields and scope of the pipe material, but more importantly, Because the quality of seamless steel pipe is very good, the quality of the seam

(1) Structural seamless steel pipe and conveying pipe blank. Including low carbon steel, medium carbon steel and alloy structural steel tube billet, steel number has 10#, 20#, 35#, 45#, and 15Cr, 40Cr, 30CrMnSi, 12CrMoV and so on.（2） Boiler tube blank. Generally, the steel for boiler tube blanks is

20# carbon steel belongs to high-quality low-carbon steel in national standard metal materials. Because of its good toughness, plasticity and weldability, it has wide application in China's petrochemical industry, and different 20 carbon steel materials are used. The incidence is also high. However,