SUS440C has all stainless steel, heat-resistant steel in the highest hardness. For nozzles, bearings .440 F: is to improve 440C steel steel-cutting performance. For automatic lathes. Martensitic stainless steel alloy as the ordinary has achieved hardened by quenching characteristics, it can be to get a wide range of different mechanical properties by selecting grade and heat treatment conditions. SUS440C stainless steel carbon content 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%, but also one of the earliest tools used to make stainless steel, popular. If a stainless steel bearings to heat treatment is generally recommended prior to cryogenic treatment and tempering operations. Such cryogenic treatment process increases the hardness of the steel, increasing the wear resistance, and dimensional stability. Therefore, the cryogenic treatment 440C, and are often used for heat treatment of the tool. Features: high hardness and wear resistance of medium, when polished, its drawback is relatively large viscosity, and the temperature quickly. Suggested the use of chromium corundum or microcrystalline corundum grinding wheel. 440C annealing temperature is very low, as a tool and bearing heat treatment time, the 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: SUS440C a win after a hundred hardened special steel with high hardness, good corrosion resistance (magnetic) cutlery (knife), the turbine blades hardened steel hardness increased compared 440A (magnetic), blade, nozzles, valves, plate feet, tableware (scissors). SUS440C 1) Chemical composition: C Mn Si Cr SP 0.95 ~ 1.20 1.0 1.0 up 16.0 ~ 18.0 ≤ 0.03 ≤ 0.04 or less the following 2) Performance: The steel is high carbon high chromium martensitic stainless steel, quenched with high hardness, high wear resistance and corrosion resistance. 3) Usage: suitable for manufacture of the steel to withstand high wear resistance, high loads and corrosive effects in plastic mold and mold standard parts. 4) disc from the usual heat treatment: quenching and tempering heating temperature ℃ quenching medium hardness HRC tempering temperature ℃ tempering hardness HRC 1010 ~ 1070 oil or wind ≥ 60 100 ~ 175 58 ~ 60 510 52 ~ 54 twice