Good translation Metal Products (Shanghai) alloy structural steel companies (domestic alloy steel / alloy steel imports) 20cr2ni4 alloy structural steel / 20cr2ni4 steel / 20cr2ni4 steel bar / 20cr2ni4 Coil / 20cr2ni4 steel / 20cr2ni4 pipe / 20cr2ni4 wire (good Translation Metal Products (Shanghai) Co., Ltd.) 
 20Cr2Ni4 

 Standard: GB / T 3077-1988 
 Outline 
 Feature 
 20Cr2Ni4 steel case-hardened steel for high strength alloy with good mechanical properties, its hardenability, strength and toughness are more than 12CrMi3 steel. The good performance of steel forging, forging heating temperature is 1200 ℃, before forging temperature 1150 ℃, final forging temperature is higher than 850 ℃, slow cooling after forging. 20Cr2Ni4 after forging steel such as coarse grains, even after normalizing and subsequent carburizing heating, will be in the thick of the quenched martensite. 
 Use 
 Requirements for high strength carburized and quenched structures. Commonly used in the manufacture of small cars, tractor engine and transmission in gear, but also can replace 12CrNi3 steel high performance requirements of the Department of carburizing heart pieces, pieces of cyanide, such as oil drilling and metallurgical pit with teeth and claws cone body. 
 Physical properties 
 Chemical composition 
 Carbon C: 0.17 ~ 0.23 
 Si Si: 0.17 ~ 0.37 
 Manganese Mn: 0.30 ~ 0.60 
 Sulfur S: to allow the residual content of ≤ 0.035 
 Phosphorus P: allow the residual content ≤ 0.035 
 Chromium Cr: 1.25 ~ 1.65 
 Ni-Ni: 3.25 ~ 3.65 
 Copper Cu: to allow the residual content ≤ 0.030 
 Mechanical properties 
 Tensile strength σb (MPa): ≥ 1175 (120) 
 Yield strength σs (MPa): ≥ 1080 (110) 
 Elongation δ5 (%): ≥ 10 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 63 
 Impact toughness αkv (J/cm2): ≥ 78 (8) 
 Hardness: ≤ 269HB 
 Sample size: Sample size is 15mm rough 
 Standard heat treatment and microstructure 
 Standard heat treatment: quenching: the first 880 ℃, the second 780 ℃, oil cooling; tempering 200 ℃, water, air-cooled. 
 ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract. 
 The company offers domestic and imported alloy steel varieties, complete specifications, special specifications can be customized processing. Division I and to provide original certificates, material certificates (chemical mechanical properties) and the like arguments! Please note that request! Users are welcome to inquire Order, the Company will be free shipping! If necessary, other materials, please call us. 
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