The effect of tempering process on the comprehensive mechanical properties of 27SiMn seamless steel tubes for hydraulic props was studied. […]

In the process of rolling 27SiMn seamless steel tubes， there are cracks on the tubes．The chemical compositions of the tubes are tested as well as the micro analysis is made with metallurgical microscope and scanning electron micro- scope． […]

The microstructure, grain size, non-metallic inclusion and room-temperature mechanical properties of 20G and 12Cr1MoVGhot-expanded steel tubes afterlow-temperature thermo-mechanical annealing treatment were investigated, which were compared with crude sea […]

Aiming at a large number of steel pipe surface crack defects in the production process of 12CrlMoVG seamless steel pipe in a domestic enterprise, the types of defects and the reasons for the formation of cracks were analyzed by using metallographic analys […]

Pipeline steel seamless steel pipe: L245N line pipe, L360N line pipe, L290N line pipe, L415 line pipe, L245, L360, L450 line pipe, L485 line pipe, X42, X52, X60, X56 line pipe, X65 line pipe Pipe, X70, X80 line pipe. […]