Martensitic stainless steel is a type of stainless steel that achieves performance strengthening through quenching and tempering heat treatment. It features high chromium content (10%–18%) as the primary alloying element, with very low or no nickel addition. The predominant microstructure at room temperature is martensite, combining the corrosion resistance of stainless steel with the strength and toughness of structural steel.

• High Strength and Hardness: After heat treatment, yield strength and hardness are significantly increased, providing excellent wear resistance and the ability to withstand high‑load conditions.
• Heat Treatable for Strengthening: By adjusting quenching temperature and tempering parameters, mechanical properties such as strength and hardness can be flexibly tailored to meet diverse application requirements.
• Outstanding Cost‑Effectiveness: With nickel‑free or low‑nickel composition, raw material costs are lower than those of austenitic and duplex stainless steels, offering a clear cost advantage.
• Good Basic Corrosion Resistance: Compared to conventional carbon steel, it exhibits superior resistance to atmospheric, fresh water, and mild corrosive media, meeting the demands of general corrosive environments.

• Mechanical Manufacturing: Used for high‑strength wear‑resistant components such as gears, shafts, bolts, as well as tools including cutting tools, molds, and measuring instruments.
• Petroleum Valves: Suitable for valves, fittings, pump shafts and other components in oilfield extraction and pipeline systems, withstanding high pressure and mild corrosive media.
• Medical Devices: Used in the production of surgical instruments, dental tools, etc., combining hardness with resistance to disinfectant corrosion.
• Automotive Industry: Applied in engine exhaust system components, steering knuckles, and other parts requiring high strength and temperature resistance.