The main alloying element in martensiti stainless steel is chromium. Usually used in weakly corrosive media, such as seawater, fresh water and water vapor, the use of materials with a temperature less than or equal to 580 ° C, usually as a force-bearing parts and tools, due to the poor welding performance of this steel, it is generally Not used as a weldment. The main alloying elements in austenitic stainless steels are chromium and nickel. These steels have high toughness, low brittle transition temperature, good corrosion resistance and high temperature strength, good oxidation resistance and good pressure processing and welding properties. Martensitic stainless steel is described in detail: stainless steel whose mechanical properties can be adjusted by heat treatment is, in layman's terms, a kind of hardenable stainless steel. Typical grades are Cr13 type, such as 2Cr13, 3Cr13, 4Cr13 and the like. After quenching, the hardness is higher. Different tempering temperatures have different combinations of toughness and are mainly used for steam turbine blades, tableware and surgical instruments. According to the difference in chemical composition, martensiti stainless steel can be divided into martensiti chromium steel and martensiti chromium nickel steel. According to the organization and strengthening mechanism, it can be divided into martensiti stainless steel, martensiti and semi-austenitic (or semi-martensitic) precipitation hardening stainless steel and maraging stainless steel.
Austenitic stainless steel is described in detail: it refers to stainless steel with austenite structure at normal temperature. When the steel contains about 18% Cr, Ni?8%~10%, and C about 0.1%, it has a stable austenitc structure. Austenitic chrome-nickel stainless steel includes the famous 18Cr-8Ni steel and high-Cr-Ni series steel which is developed by adding Cr, Ni content and adding elements such as Mo, Cu, Si, Nb and Ti. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low. It is impossible to strengthen it by phase transformation. It can only be strengthened by cold working. For example, adding elements such as S, Ca, Se, Te has good Easy machinability.
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