It is a high-quality medium carbon steel made by electric furnace, open hearth furnace or pure oxygen converter steelmaking method, with the characteristic of uniform metallographic structure. The steel has a carbon content (mass fraction,%) of ≥ 0.4, excellent wear resistance, reduced ductility, and is prone to deformation and cracking during quenching. Therefore, quenching is extremely important. After cutting and tempering, it must be rapidly cooled to avoid tempering brittleness. By implementing spheroidization treatment, the cutting performance of this type of carbon steel can be improved. This steel is usually tempered to a hardness of 19-22HRC before use to increase its cutting performance.
performance
Introduction to the Performance of s50c/s53c Steel Products
(1) High quality medium carbon steel, made by electric furnace, open hearth furnace or pure oxygen converter steelmaking method, has the characteristic of uniform metallographic structure. The steel has a carbon content (mass fraction,%) of ≥ 0.4, excellent wear resistance, reduced ductility, and is prone to deformation and cracking during quenching. Therefore, quenching is extremely important. After cutting and tempering, it must be rapidly cooled to avoid tempering brittleness.
By implementing spheroidization treatment, the cutting performance of this type of carbon steel can be improved. This steel is usually tempered to a hardness of 19-22HRC before use to increase its cutting performance
(2) Supply status and hardness: 143~187HBS, 179~235HBS, 212~277HBS.
(3) Steel characteristics: excellent machinability and cutting performance
(4) General use of steel: suitable for plastic mold frame panels and mechanical parts
Ingredients (mass fraction,%)
Carbon: C 0.47-0.53
Silicon: Si 0.15~0.35
Manganese: Mn 0.60-0.90
Phosphorus: P ≤ 0.030
Sulfur: S ≤ 0.035
Copper: Cu ≤ 0.30
Nickel: Ni ≤ 0.20
Chromium: Cr ≤ 0.20
mechanical property 
Tensile strength σ b (MPa): ≥ 630 (64)
Yield strength σ s (MPa): ≥ 375 (38)
Elongation rate δ 5 (%): ≥ 14
Shrinkage rate of cross-section (%): ≥ 40
Impact energy Akv (J): ≥ 31 (4)
Impact toughness value α kv (J/cm2): ≥ 39 (4)
Heat treatment specification: normalizing, 830 ℃; Quenching, 830 ℃; Tempering at 600 ℃.
Metallographic structure: pearlite+ferrite.
Chinese GB standard steel grade 50; Japanese JIS standard steel grade S50C/S53C; German DIN standard material steel grade 1.1213; German DIN standard steel grade CF53; British BS standard steel grade 060A52; French AFNOR standard steel grade XC48TS; French NF standard steel grade C50; Italian UNI standard steel grade C53; Belgian NBN standard steel grade C53; Swedish SS standard steel grade 1674; Spanish standard steel grade F.112; AISI/SAE standard steel grade 1050 in the United States; International Organization for Standardization ISO standard steel grade C50E4.