Chemical composition of steel, carbon manganese cobalt chromium Cr Co N N C Mn Mo Mo Ni Ni P P Si Si S S W W v VHRC440C1. 58-0017.50-0.500.50-0.040.300.03-60 Si Si: C: 1.00 or less carbon manganese Mn: 0.95 ~ 1.20 1.00 or less sulfur S: 0.030 or less phosphorus P: 0.035 or less chromium Cr: 16.00 ~ 18.00 Ni Ni: allow contains 0.60 or less mechanical properties, hardness annealing, 269 hb or less; Quenching tempering, 58 HRC or higher mechanical properties: internal stress (250 N/was), tensile strength (560 N/was) EL (18%), HB (250) annealing heat treatment process editor 1), 800 ~ 920 ℃ slow cooling. 2) quenching, 1010 ~ 1070 ℃ oil cooling; 3) tempering, 100 ~ 180 ℃ cold fast. Scope of application is mainly used for manufacturing in corrosion environment and no lubrication bearing working parts in strong oxidizing atmosphere. 440 c has good temperature resistance, high temperature size so can also be used as corrosion resistant high temperature bearing steel. In addition, can also be used to manufacture high quality tools, such as medical scalpel, scissors, nozzle, bearings, etc. 440 f, is to improve the performance of 440 c steel free cutting steel, used for automatic lathe, as well as ordinary alloy steel by quenching hardening characteristics, thus can be obtained by selecting the brand and heat treatment conditions to wide range of different mechanical properties. 440 c under dynamic load capacity is low. Delivery of general with heat treatment state delivery, its heat treatment type specified in the contract; Not specified, the heat treatment state delivery not sex 440: high strength cutting steel, carbon is a bit high, after appropriate heat treatment can obtain higher yield strength and hardness can reach 58 HRC, belongs to the most hardened stainless steel. The most common application example is the "razor blade. There are three kinds of commonly used models: 4440 c, and 440 f (processing).