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Mechanical properties of 440C stainless steel

Hardness: Annealed,≤269HB;

Quench and temper,≥58HRC

440C stainless steel mechanical properties

Internal stress (250 N/mm2)

Tensile strength (560 N/mm2)

EL(18%) HB(250)

440C stainless steel heat treatment process

Annealing, 800 ~ 920℃ slow cooling

Quenching, 1010 ~ 1070℃ oil cooling

Tempering, 100 ~ 180℃ fast cold

440C stainless steel properties and characteristics

The carbon content of 440C stainless steel C-1.% This steel has good rust resistance, and is the most commonly used stainless steel for importing knives. Its chromium content is as high as 16-18%, and it is also one of the earliest stainless steel used for cutting tools.

If it is used as a stainless bearing steel for heat treatment, it is generally recommended to conduct cryogenic treatment before tempering operation. This cryogenic treatment increases the hardness of the steel, increases the wear resistance, and increases the dimensional stability. Therefore, the cryogenic treatment of 440C is also often used for tool heat treatment.

High hardness and medium wear resistance, when grinding, its disadvantage is that the viscosity is relatively large, and the temperature is fast. It is recommended to use chrome corundum or microcrystalline corundum grinding wheel for grinding. The annealing temperature of 440C is very low, and when the tool and bearing are heat treated, the hardness can reach HRC60 if the cryogenic treatment is carried out. Corrosion resistance and toughness are very strong, now more widely used in hand-made knives and high-quality factory tools.