PageLink Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) and 40B alloy structural steel / 40B steel plate / 40B steel bars / 40B coil / 40B strip / 40B steel pipe / 40B steel wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 40B, alloy structural steel. Unified digital code: A70402 
 Chemical composition (mass fraction) (%) 
 C: 0.37 ~ 0.44 
 Si: 0.17 ~ 0.37 
 Mn: 0.60 ~ 0.90 
 B: 0.0005 ~ 0.0035 
 Mechanical Properties]. 
 Sample blank size (mm): 25 
 Heat treatment: 
 First quenching temperature (° C): 840; coolant: water 
 Second quenching temperature (℃): - 
 Tempering the heating temperature (° C): 550; coolant: water 
 Tensile strength (σb / MPa): ≧ 785 
 Yield point (σs of / MPa): ≧ 635 
 Elongation (δ5 /%): ≧ 12 
 Section shrinkage rate (ψ /%): ≧ 45 
 Absorbed energy (Aku2 / J): ≧ 55 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 207 
 The main characteristics of 
 Hardenability than 40 steel in the water critical hardenability diameter of 17 ~ 32mm in oil critical hardenability diameter up to 7 ~ 16mm; quenching in oil, its hardness, toughness, and section shrinkage than 40 steel. After quenching and good overall performance, can replace 40Cr. 
 [Application Examples] 
 This steel is usually used in the quenched and tempered condition for manufacturing performance requirements slightly higher than 40 steel cross-section larger parts such as gears, steering tie rod, shaft, convex axis, tractor crank handle and other parts. They can also replace parts of the small size of 40Cr steel production performance of less demanding. 
 The company provides domestic and imported alloy structural steel varieties, complete specifications, special specifications can be customized processing. Division I and the original certificates, material certificates (chemical composition, mechanical properties) of the class parameters Please pay attention to obtain a copy of the public are welcome to the user to inquire Order, the Company will be free shipping! If necessary other material, please contact us. 
 Customers in ordering materials, the need to sample customers, please note, MOQ: 50KG (包邮) the number of excellent price, welcome you to call to order this material Our commitment: quality assurance Cheaper prices, excellent! Honesty! 

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 (Good translation of the Metal Products (Shanghai) Co., Ltd. published) 
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