Good translation of the carbon steel (domestic carbon steel / imports of carbon steel) CK22 carbon steel / CK22 steel plate / CK22 steel bars / CK22 steel coils / CK22 strip Metal Products (Shanghai) / CK22 steel pipe / the CK22 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 Executive Standard: JIS G4051-2005 
 ● Features and Scope: 
 The S20C intensity slightly higher than the 15 # steel, very little quenching, temper brittleness. Cold deformation of high plasticity, usually for bending, rolling, curved edges and hammer arch processing, arc welding and the welding performance of contact welding, gas welding, thin, shape requires strict or complex shape parts prone to cracks. The machinability drawn or normalizing state than the annealed condition is good, the S20C generally used in the manufacture of uneven force large and require high toughness parts. 
 (1) characteristics of cold-extruded, carburized hardened steel. The steel is a low-carbon-carbon steel, the steel strength, toughness, ductility and weldability. Yield strength ≥ 245MPa, Tensile strength ≥ 245MPa, Elongation rate ≥ 28%. Normalizing the Organization for the Advancement of the ball, thinning the big blocky proeutectoid ferrite to improve the cutting performance of less than 160HBS rough. 
 (2) Availability state is not heat treated. 
 (3) chemical composition (mass fraction,%) 0.18-023 of Si 0.15-0.35, Mn 0.30-0.60, P ≤ 0.030, S ≤ 0.035. 
 (4) refer to the corresponding steel in China GB / JB standard steel No. 20, China's Taiwan CNS standard steel S20C, the German DIN standard material number 1.0402, the German DIN standard steel CK22/C22, British Standard BS steel IC22, France AFNOR standard steel CC20, the French NF standard steel of C22, C20/C21 Italian UNI standard steel Belgium NBN standard steel grade C25 for-1, Sweden SS standard steel No. 1450, the Spanish UNE standard steel No. F.112 U.S. AISI / SAE standard steel No. 1020, Japan JIS standard steel S20C/S22C. 
 (5) phase transition point temperature (approximate) the Ac1 = 720-845 ℃, Ar1 = 815-730 ℃ 
 (6) Cold pressed rough softening specification temperature of 700-720 ° C, holding time 8-15h, to 50-100 ° C / h cooling rate, reduce the temperature of ≤ 550-600 ° C, cooled baked. 
 Before processing hardness ≤ 143HBS, hardness ≤ 131HBS treatment. 
 (7) the normalizing specification temperature of 870-920 ° C, cooled baked. 
 (8) annealing specification temperature is about 860 ° C, cooled baked. 
 (9) quenching specification temperature 910 ° C ± 10 ° C, 10% NaCl brine cooling. 
 Performance and Application 
 Slightly higher than the S15C steel strength, good weldability, no temper brittleness, improve the workability by water quenching. 
 Uses: used in the manufacture to withstand great stress and various mechanical parts that require high toughness. General machinery and motor vehicles, agricultural machinery for the manufacture of surface hardness of the Heart Ministry requires little carburizing and carbonitriding parts. 
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 (Good translation of the Metal Products (Shanghai) Co., Ltd. published) 
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