Described mainly in the paper are the origin and procedure for marking of pipe to multiple grades as newly required under API Spec 5L Specification for Line Pipes， the 45th edition. Only agreed by both the purchaser and the manufacturer， should marking of […]

Through chemical composition design, steelmaking, rolling, heat treatment and other process control, the low-temperature impact toughness and corrosion resistance of -100 t low-temperature seamless steel pipes are guaranteed. It is important to point out […]

Crack Analysis and Control of 40Cr Seamless Steel Pipe of 40Cr seamless steel pipe—crack is comprehensively analyzed, and the cause of the crack is found out. […]

34CrMo4 gas cylinder has "bubbling" defects, and its chemical composition, defect formation mechanism, and production process are analyzed. […]

Based on the blood physical characteristics of the quenching medium and solid surface, the finite element software was used to quantitatively simulate the quenching process of the 30CMnMo steel seamless pipe—analyzed the quenching temperature and residual […]