GB5310 standard mainly used in the manufacture of high pressure and above the pressure of the steam boiler pipes and other high-quality carbon structural steel, alloy steel and stainless steel heat-resistant steel seamless steel delivery standards.GB5310 standard main steel grade:12CrMoG,15NiMnMoNbCu,30Cr1MoVG,12Cr2MoG,10Cr9Mo1VNb,12Cr2MoWVTiB and so on.