440C stainless steel carbon content of C-1.2% this rust resistant steel is good, is more commonly used mass production and imported stainless steel knife, its chromium content up to 16-18%, also the first one tool for making stainless steel, popular. If, as stainless steel bearings for heat treatment is generally recommended before tempering operations cryogenic treatment. Such cryogenic treatment increased the hardness of the processing of steel, increased wear resistance, and dimensional stability. Therefore, cryogenic treatment 440C, and are often used on the tool heat treatment. Features: high hardness and wear resistance of medium, when polished, its disadvantage is the relatively large viscosity and temperature quickly. Suggested the use of chromium corundum or microcrystalline corundum grinding wheel for grinding. 440C annealing temperature is very low, as a tool and bearing heat treatment time, hardness can usually reach HRC57-59, if carried out cryogenic treatment, the hardness can reach HRC59-61. Corrosion resistance and toughness are strong, now more widely used in high-quality hand-made knife and tool manufacturing plant. Purpose: 440C Assab special steel after quenching high hardness, good corrosion resistance (magnetic) cutlery (knife), after the turbine blades hardened steel than 440A hardness increased (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: 1.10 Mn: 1.00 P: 0.03 S: 0.010 Cr: 17.50 Mo: 0.60 Ni: 0.60 Cu: 0.50 Si: 1.00 Features Applications: stainless steel grades in the country, 440C has a higher hardness. Mainly used in the manufacture working in corrosive environments and non-lubricated bearing parts strong oxidizing atmosphere. 440C has a good high-temperature dimensional temperature resistance, corrosion resistance, so it can be used as high-temperature bearing steel. In addition, you can also be used to manufacture high-quality tools, such as medical scalpels, scissors, nozzles, bearings. 440F: to improve the performance of 440C steel-cutting steel for automatic lathes, martensitic stainless steel alloy as the ordinary has achieved hardened by quenching properties, it can be obtained by selecting a wide range of grades and heat treatment conditions different mechanical properties. 440C lower ability to withstand dynamic loads.