No. 70 steel Steel Sheet No. 70 and No. 65 steel similar performance, flexibility and strength slightly, No. 70 steel for the manufacture of small cross-section, less demanding strength, general machine round, square coil springs, such as cars, withstand vibration and round flat leaf spring coil spring mechanical tractor or train. Chemical Composition: Carbon C: 0.67 ~ 0.75 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.50 ~ 0.80 Sulfur S: ≤0.035 phosphorus P: ≤0.035 chromium Cr: ≤0.25 Ni-Ni: ≤0.30 copper Cu: No. ≤0.2570 steel and T7 T7 distinction belongs to the mechanical properties of S40C carbon tool steel, and 70 are high-quality carbon steel S40C corresponding trademark in use is not the same. In composition than carbon is not the same way S40C supply, tool steel in order to reduce cold brittleness, brittle and therefore less heat parathion element content. s50c / s53c performance steel products introduction (1) High quality carbon steel, the use of the furnace, open-hearth, or oxygen converter steelmaking method of manufacturing a full static steel, with a uniform microstructure features. The steel carbon content (mass fraction,%) ≥0.4, excellent wear resistance, ductility decreased deformation hardening and cracking, it is extremely important hardened S40C, must be cut after quenching and tempering, in order to avoid the occurrence of temper brittleness. Through the introduction of ball handling, we can improve the cutting performance of this type of steel. The steel is usually tempered to hardness 19 ~ 22HRC later use to increase their cutting performance (2) Supply condition and hardness of 143 ~ 187HBS, 179 ~ 235HBS, 212 ~ 277HBS. (3) steel characteristics of a good machinability and cutting particularly good (4) general purpose carbon steel S50C steel is suitable for plastic mold with a plate and mechanical parts China GB standard steel No. 50; Japan JIS standard steel S50C / S53C ; German DIN standard material steel 1.1213; German DIN standard steel CF53; British BS standard steel 060A52; French AFNOR standard steel XC48TS; French NF standard steel C50; Italy UNI standard steel C53; Belgium NBN standard steel C53 ; Swedish SS 1674 standard steel; the Spanish standard steel F.112; American AISI / SAE standard steel 1050; ISO ISO standard steel C50E4. S40C chemical composition _ Suzhou, with (certified) _S40C by day with Metal Materials Co., Ltd. Suzhou. Suzhou, with Metal Materials Co. (www.szrtjs.com) is Suzhou, metal building materials leader, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Suzhou, with the leadership of the staff warmly welcome all inquiries negotiations to create Suzhou, with a better future.