20Cr cold-rolled plate (volume) alloy structural steel 0.3 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr cold-rolled plate (volume) alloy structural steel 0.4 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr cold rolled plate (volume) alloy structural steel 0.5 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr cold-rolled plate (volume) alloy structural steel 0.6 * 50-350 * C Baosteel, Hangzhou Iron and Steel, cold rolled sheet Dragons 20Cr (volume) alloy structural steel 0.8 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing 20Cr cold-rolled plate (volume) alloy structural steel 1.0 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr cold-rolled plate (volume ) alloy structural steel 1.2 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr cold-rolled plate (volume) alloy structural steel 1.5 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr cold-rolled plate (volume) alloy structural steel 1.8 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing 20Cr cold-rolled plate (volume) alloy structural steel 2.0 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr cold-rolled plate (volume) alloy structural steel 2.5 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr cold-rolled plate (volume) alloy structural steel 3.0 * 50-350 * C Baosteel, Hangzhou Iron and Steel, Nanjing Steel 20Cr, alloy structural steel. Unified digital code: A20202 standard GB / T 3077-1999 Chemical Composition (%) Carbon C: 0.18 ~ 0.24 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.50 ~ 0.80 Chromium Cr: 0.70 ~ 1.00 Sulfur S: ≤ 0.035 to allow the residual content of phosphorus P: ≤ 0.035 to allow the residual content of Ni-Ni: ≤ 0.030 to allow the residual content Copper Cu: ≤ 0.030 to allow the residual content of tensile strength (σb / MPa): ≥ 835 yield point (σs / MPa): ≥ 540 Elongation (δ5 /%): ≥ 10 Reduction of (ψ /%): ≥ 40 impact energy (Aku2 / J): ≥ 47 Brinell hardness (HBS100/3000) (annealing or tempering state): ≤ 179 Domestic: Q390 Q420 Q460 Q550 Q690 Sweden SSAB: DOXMEX700 DOXMEX900 DOXMEX960 DOXMEX700MC DOMEX960MC ThyssenKrupp of Germany: "S690QL" Xabo 890 high-strength steel in Finland: "S690QL" OPTIM960QC Japan JFE: "S690QL" "S690QL" "S690QL" European standard Germany: " S690QL "S960QL .............................................................................. sales hotline 18116155360 Li