SUS440C the steel is martensitic stainless steel, carbon steel than 3cr13 high, strength, hardness than 3cr13 steel high performance with other similar 3cr13 steel, but welding is poor, usually no welding. For the manufacture of surgical tools. SUS440C Japan imports of stainless steel in corrosive environment for the manufacture of strong oxidizing and non-lubricated bearings working parts. The steel there is a better high temperature dimensional stability, high temperature bearings and corrosion can be made temperature does not exceed 250 ℃ tool. 440C: C-1.2% carbon content of this steel is very good resistance to rust, is currently used in high-end volume of high quality stainless steel knives on the market, its strength and sharpness even in the ATS-34, chromium content as high as 16-18%, is the second most commonly used stainless (ATS-34), Cutler is the first to be accepted stainless steel, and has been very popular, especially in the minus processes have been developed after this treatment to enhance the toughness of steel. Characteristics: high hardness and good wear resistance, in polished, its drawback is that relatively large viscosity, and the temperature quickly, but it is more likely than any steel polished, hand-sawn material is also much easier. 440C annealing temperature is very low, usually to achieve hardness HRC56-58, corrosion resistance and toughness are strong, are more widely used in high-quality hand-made knife and tool manufacturing plant. Uses: 440C Assab special steel after quenching, high hardness, good corrosion resistance (magnetic) cutlery (knives), turbine blade after quenching, the hardness increased more than 440 steel (magnetic) blades, nozzles, valves, plate feet, cutlery (scissors). Mechanical properties: stress (250 N/mm2) tensile strength (560 N/mm2) EL (18%) HB (250) Chemical composition: C: 0.95 ~ 1.20, Si: 1.00, Mn: 1.00, P: 0.040, S: 0.030, Cr: 16.0 ~ 18.0, Mo: 0.75, hardness HRC: 58 ~ 62 Features Applications: 440C has all stainless steel, heat-resistant steel in the highest hardness. For nozzles, bearings .440 F: to improve the performance of 440C steel free-cutting steels. For automatic lathes. Martensitic stainless steel and alloy steel as a general hardening of the features to achieve through hardening, so by selecting the grade and heat treatment conditions to obtain a wide range of different mechanical properties.