Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 27simn alloy structural steel / steel plate 27simn / 27simn steel bars / 27simn coil / 27simn strip / 27simn steel pipe / 27simn wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 27SiMn, alloy structural steel. Unified digital code: A10272 
 Standard: GB / T 3077-1999 
 The main characteristics of 
 The performance of this steel is superior to 30Mn2 steel, high hardenability, through the diameter of the critical quenching in water up to 8 ~ 22mm, good machinability, cold deformation plasticity and weldability medium; steel toughness in the heat treatment to reduce the few but there is a very high strength and wear resistance, in particular, is still higher in the water quenched toughness; sensitivity of this steel white spot when the heat treatment have a tendency to temper brittleness and thermal sensitivity. 
 [Application Examples] 
 This steel is used in the quenched and tempered condition, used for hot stamping manufacturing requirements of high toughness and wear resistance; can also be used in the supply of normalizing or hot-rolled state, such as tractor track pin. 
 Chemical composition 
 Chemical composition (mass fraction) (%) 
 C: 0.24 ~ 0.32 
 Si: 1.10 ~ 1.40 
 Mn: 1.10 ~ 1.40 
 Mechanical properties 
 Mechanical Properties]. 
 Sample blank size (mm): 25 
 Tensile strength (σb / MPa): ≧ 980 
 Yield point (σs of / MPa): ≧ 835 
 Elongation (δ5 /%): ≧ 12 
 Section shrinkage rate (ψ /%): ≧ 40 
 Absorbed energy (Aku2 / J): ≧ 39 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 217 
 Heat treatment process 
 Heat treatment: 
 First quenching temperature (° C): 920; coolant: water 
 Second quenching temperature (℃): - 
 The heating and tempering temperature (° C): 450; coolant: water, oil. 
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