Good translation of the Metal Products (Shanghai) carbon steel (domestic carbon steel / imports of carbon steel) of 20Mn carbon tool steel / of 20Mn steel plate / of 20Mn steel bar / of 20Mn steel coils / of 20Mn steel strip / of 20Mn steel pipe / of 20Mn steel wire ( good translation of Metal Products (Shanghai) Co., Ltd.) 
 20mn introduced 
 Material: high quality carbon structural steel 
 Grade: of 20Mn 
 Standard: GB / T 699-1988 
 ● Features and Scope: 
 High manganese low-carbon penetration steel, performance and 15Mn steel. Manganese (W mn 0.70% -1.00%) carburizing of low carbon steel, manganese and high so its strength. Plastic can be slightly higher machinability and hardenability than 15 steel, carburizing and quenching formed on the surface less soft spots should carburizing and carbonitriding treatment, surface abrasion resistance and good toughness of the core part of the comprehensive performance. Hot-rolled or normalizing toughness. Gears crank shaft, bracket than the chain screw nut riveting structure, plate suitable for the manufacture of barrels of oil. Cold region agricultural implements, such as cream cans. 
 Chemical composition 
 ● chemical composition: 
 Carbon C: 0.17 ~ 0.24 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.70 ~ 1.00 
 Sulfur S: ≤ 0.035 
 Phosphorus P: ≤ 0.035 
 Chromium Cr: ≤ 0.25 
 Ni - Ni: ≤ 0.25 
 Copper Cu: ≤ 0.25 
 Mechanical properties 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 450 (46) 
 Yield strength σs (MPa): ≥ 275 (28) 
 Elongation δ5 (%): ≥ 24 
 Section shrinkage ψ (%): ≥ 50 
 Hardness: heat treatment, ≤ 197HB 
 Sample size: sample size is 25mm 
 ● Heat treatment and microstructure: 
 Heat Treatment Specification: normalizing, 910 ℃. 
 ● Delivery status: no heat treatment or heat treatment (annealing, normalizing or high-temperature tempering) state delivery. Require heat treatment delivery should be specified in the contract, does not indicate no heat treatment delivery. 
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 (Good translation of the Metal Products (Shanghai) Co., Ltd. published) 
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