Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 25crmnsi alloy structural steel / steel plate 25crmnsi / 25crmnsi steel bars / 25crmnsi coil / 25crmnsi, steel strip / 25crmnsi steel pipe / 25crmnsi wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 25CrMnSi, an alloy structural steel grades of the Chinese national standard. Uniform digital code: A24252. 
 Standard: GB / T 3077-1988 
 Chemical composition of mass fraction (%): 
 Carbon C: 0.22 ~ 0.28 
 Silicon Si: 0.90 ~ 1.20 
 Mn Mn: 0.80 ~ 1.10 
 Sulfur S: Allow the residual content of ≤ 0.035 
 Phosphorus P: Allow the residual content of ≤ 0.035 
 Chromium Cr: 0.80 ~ 1.10 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.030 
 Mechanical properties 
 [Sample blank dimensions 
 25mm 
 [Heat] 
 Quenching temperature (° C): 880; coolant: Oil 
 Heating tempering temperature (° C): 480; coolant: water, oil 
 Mechanical Properties]. 
 Tensile strength σb (MPa): ≥ 1080 (110) 
 Yield strength σs (MPa): ≥ 885 (90) 
 The elongation δ5 (%): ≥ 10 
 Reduction of area ψ (%): ≥ 40 
 Impact energy Akv (J): ≥ 39 
 The impact toughness αkv (J/cm2): ≥ 49 (5) 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 217 
 Standardized heat treatment: hardening 880 ° C, cold oil; tempering 480 ° C, water-cooled, oil cooled. 
 Delivery status: to heat treatment (normalizing, annealing, or high-temperature tempering) or heat treatment state of delivery, the delivery status should be indicated in the contract. 
 The main features of higher intensity than 20CrMnSi poor toughness. After heat treatment, strength, ductility, and toughness. 
 Application examples 
 Manufacturing rod, welding and stamping parts, high strength structure 
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