"Beijing Siu promise commerce, Co., Ltd. 
 Material Name: Gear Steel 20CrMnMo 
 ● Features and Scope: 
 Good performance of thermal processing, normalizing after cutting performance, good mechanical properties and low temperature impact toughness after quenching and tempering, carburizing after high flexural strength and wear resistance, but poor welding performance. appropriate warm-up prior to welding, welding should be tempered. Used in the manufacture of high surface hardness, wear resistance good important carburizing, such as gears, camshafts, connecting rods, pins, etc.. 
 ● chemical composition: 
 Carbon C: 0.17 to 0.23 
 Silicon Si: 1.17 ~ 1.37 
 Mn Mn: 0.90 ~~ 1.20 
 Sulfur S: allow the residual content of ≤ 0.035 
 Phosphorus P: allow the residual content of ≤ 0.035 
 Chromium Cr: 1.10 ~ 1.40 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.030 
 Mo Mo: 0.20 ~~ 0.30 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 1175 (120) 
 Yield strength σs (MPa): ≥ 885 (90) 
 Elongation δ5 (%): ≥ 10 
 Section shrinkage ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 55 
 Impact toughness αkv (J/cm2): ≥ 69 (7) 
 Hardness: ≤ 217HB 
 Sample size: sample blank size is 15mm 
 ● Heat treatment and microstructure: 
 Standardized heat treatment: hardening 850 ° C, cold oil; tempering 200 ℃, water-cooled, air-cooled. 
 Microstructure: tempered martensite. 
 Delivery status: heat treatment (normalizing, annealing, or high-temperature tempering) with or without heat treatment delivery, the delivery status should be indicated in the contract. 


 Zheng Yan / Zheng Yan 

 Tel: +86 010-84329660 

 Fax: +86 010-84312361 

 QQ: 2684574040 

 Email: 2684574040@qq.com 


 Alibaba: http://zhaonuo1.cn.alibaba.com/ 

 Website: http://bjzhaonuo.com.cn/ (gifted Steel Miss Zheng)