S50C mold material 
 Details: 
 Standard chemical composition 
 C (%) Mn (%) Si (%) Cr (%) Ni (%) P (%) S (%) Other 
 0.47-0.53 0.60-0.90 0.15-0.30 - - ≤ 0.030 ≤ 0.035 - 
 S50C hardness 180HV the following 
 Main purpose 
 Brake, bicycle parts, auto parts, chain parts, office equipment parts, safety belt buckle, pens, folders, pen, hair clips, stationery, meter, putty knives, washers, rings, shoes core, spikes, speaker. 
 (1) features high-quality carbon steel, used by the electric furnace, open hearth, or oxygen steelmaking method of manufacturing the entire static steel, with a uniform microstructure characteristics. The carbon content of steel (mass fraction,%) ≥ 0.4, wear resistance, ductility reduction, deformation hardening and cracking, it is extremely important quenching, quenching must be cut after tempering to avoid temper embrittlement. 
 Through the introduction of ball handling, to improve the cutting performance of such steel. The steel is usually tempered to hardness 19 ~ 22HRC later use, to increase its cutting performance 
 (2) supply condition and hardness of 143 ~ 187HBS, 179 ~ 235HBS, 212 ~ 277HBS. 
 (3) chemical composition (mass fraction,%) C 0.47 ~ 0.53, Si 0.15 ~ 0.35, Mn 0.60 ~ 0.90, P ≤ 0.030, S ≤ 0.035, Cu ≤ 0.30, Ni ≤ 0.20, Cr ≤ 0.20. 
 (4) Mechanical Properties 
 Tensile strength σb (MPa): ≥ 630 (64) yield strength σs (MPa): ≥ 375 (38) Elongation δ5 (%): ≥ 14 
 Reduction of area ψ (%): ≥ 40 Impact energy Akv (J): ≥ 31 (4) impact toughness αkv (J/cm2): ≥ 39 (4) 
 Hardness: no heat treatment, ≤ 241HB; annealed steel, ≤ 207HB sample size: Sample size is 25mm 
 (5) heat treatment specifications and microstructure 
 Heat treatment specifications: normalizing, 830 ℃; quenching, 830 ℃; tempering, 600 ℃. 
 Microstructure: ferrite + pearlite. 
 (6) Delivery status: no heat treatment or heat treatment (annealing, normalizing or tempering) the status of delivery.