Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 40Cr alloy structural steel / 40Cr steel plate / 40Cr steel bars / 40Cr steel coils / 40Cr steel strip / 40Cr steel pipe / 40Cr steel wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 According to standard GB / T-3077-1999 
 Corresponding foreign standards: JIS G4053 
 The ASTM A29 / 
 The ISO 683-18:1996 
 Chemical composition 

 Grades of C, Si Mn Cr of Ni the PS the CU 
 40Cr 0.37 ~ 0.44 0.17 ~ 0.37 0.50 ~ 0.80 0.80 ~ 1.10 ≤ 0.030 ≤ 0.035 ≤ 0.035 ≤ 0.030 
 Mechanical properties 
 Sample blank size (mm): 25 
 Heat treatment: 
 First quenching temperature (° C): 850; coolant: Oil 
 Second quenching temperature (℃): - 
 Tempering the heating temperature (° C): 520; coolant: water, oil 
 Tensile strength (σb / MPa): ≧ 980 
 Yield point (σs of / MPa): ≧ 785 
 Elongation (δ5 /%): ≧ 9 
 Section shrinkage rate (ψ /%): ≧ 45 
 Absorbed energy (Aku2 / J): ≧ 47 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 207 
 40cr introduced 

 (Approximate) Acm = 780 ℃ 
 [Normalizing norms] 
 Temperature of 850 ~ 870 ° C, the hardness of 179 ~ 229HBS. 
 Rough (cold press) softening specification] 
 Temperature of 740 ~ 760 ℃, holding time 4 ~ 6h, the cooling rate of 5 ~ 10 ° C / h, cooling to ≤ 600 ° C, cooled baked. 
 Before it is processed the hardness the ≤ 217HBS, soften the hardness ≤ 163HBS. 
 [Quenched and specifications] 
 Quenching temperature of 850 ° C ± 10 ° C, cold oil; tempering temperature of 520 ° C ± 10 ° C, water, oil, air-cooled, delivery status 
 The 40Cr delivery status to the state of heat treatment (normalizing, annealing, or high-temperature tempering) or not heat treatment delivery, delivery status should be indicated in the contract. 
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 (Good translation of the Metal Products (Shanghai) Co., Ltd. published) 
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