Stainless steel whose mechanical properties can be adjusted by heat treatment is, in layman's terms, a type of hardenable stainless steel. Typical grades are Cr13 type, such as 2Cr13, 3Cr13, 4Cr13, etc. The hardness is high after quenching, and different tempering temperatures have different strength and toughness combinations. It is mainly used for steam turbine blades, tableware, and surgical instruments. According to the difference in chemical composition, martensitic stainless steel can be divided into two categories: martensitic chromium steel and martensitic chromium-nickel steel. According to the difference in organization and strengthening mechanism, it can also be divided into martensitic stainless steel, martensitic and semi-austenitic (or semi-martensitic) precipitation hardening stainless steel, and martensitic aging stainless steel.
Martensitic stainless steel is a type of stainless steel that can be strengthened by heat treatment. Compared with ferritic stainless steel and austenitic stainless steel, it has a higher C content, high strength, hardness and good wear resistance. However, the corrosion resistance, plasticity and toughness are reduced, and the welding performance is poor, so it is generally not used as a welded part. Due to these shortcomings, the use of martensitic stainless steel is limited. It is usually only used to manufacture parts that require high strength, hardness and wear resistance but not too high corrosion resistance.
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