Through the implementation of spheroidizing treatment, the cutting performance of this type of carbon steel can be improved. The steel is usually used after tempering to a hardness of 19~22HRC to increase its cutting performance and supply status and hardness of 143~187HBS, 179~235HBS, 212~277HBS. High-quality high-quality medium-carbon steel, using all-static steel made by electric furnace, open hearth furnace or pure oxygen converter steelmaking method, has the characteristics of uniform metallographic structure. This steel has carbon content (mass fraction, %) ≥ 0.4, excellent wear resistance, reduced ductility, easy performance and cracking after quenching, so quenching is extremely important, and it must be quenched after tempering to avoid temper brittleness. Through the implementation of spheroidizing treatment, the cutting performance of this type of carbon steel can be improved. The steel is usually used after tempering to a hardness of 19~22HRC to increase its cutting performance. Carbon C: 0.47～0.55 Silicon Si: 0.17～0.37 Manganese Mn: 0.50～0.80 Sulfur S: ≤0.035 Phosphorus P: ≤0.035 Chromium Cr: ≤0.25 Nickel Ni: ≤0.25 Copper Cu: ≤0.25 Tensile strength σb (MPa) ：≥630(64) Yield strength σs (MPa): ≥375(38) Impact toughness value αkv (J/cm2): ≥39(4) Hardness: unheated, ≤241HB; annealed steel, ≤207HB Sample size: The sample size is 25mm. Heat treatment specifications: normalizing, 830℃; quenching, 830℃; tempering, 600℃. Metallographic structure: pearlite + ferrite. Delivery in the state of no heat treatment or heat treatment (annealing, normalizing or high temperature tempering). Delivery in the heat-treated condition should be specified in the contract. Those not specified shall be delivered without heat treatment. Chinese GB standard steel number 50; Japanese JIS standard steel number S50C/S53C; German DIN standard material steel number 1.1213; German DIN standard steel No. CF53; British BS standard steel number 060A52; French AFNOR standard steel number XC48TS; French NF standard steel number C50; Italy UNI standard steel number C53; Belgium NBN standard steel number C53; Sweden SS standard steel number 1674; Spanish standard steel number F .112; American AISI/SAE standard steel number 1050; International Organization for Standardization ISO standard steel number C50E4. 1, can be used for various cold work mold backing plate 2, drilling mold fixing plate 3, standard template materials, etc.
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