Main grades of martensite：403、410、414、416、416(Se)、420、431、440Introduction: heat treatment can adjust the mechanical properties of stainless steel,Website: , popularly said, is a kind of can be hardened stainless steel. Typical grades are Cr13 type, such as 2Cr13, 3Cr13, 4Cr13, etc.. After quenching, the hardness is higher, the different tempering temperature has different strength and toughness, which is mainly used for steam turbine blades, tableware and surgical instruments. According to the differences in chemical composition, martensitic stainless steel can be divided into martensite and martensite chromium chromium nickel steel two. According to the difference of the microstructure and strengthening mechanism, it can be divided into martensite stainless steel, martensite and semi austenite (or semi martensite) precipitation hardening stainless steel and martensite stainless steel, etc.Performance features：High strength, good mechanical properties and high temperature oxidation resistanceMain criteria：GB/T14976 fluid transfer stainless steel seamless pipe _Heat resistant chromium and chromium nickel stainless steel plate, sheet and strip for SA-240/SA240M pressure vessel and general purposeGeneral requirements for SA-450/SA450M carbon steel, ferritic alloy steel and austenitic alloy steel tubeSA-268/SA268M general purpose seamless and Welded Ferritic and martensitic stainless steel tubesGeneral requirements for SA-1016/SA1016M ferritic alloy steel and austenitic alloy steel tubeMain criteria