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20CrNiMo，是中国国家标准规定的一种合金结构钢的牌号。统一数字代号：A50202

铜 Cu：允许残余含量≤0.30

交货状态：以热处理（正火、退火或高温回火）或不热处理状态交货，交货状态应在合同中注明。

20CrNiMo, a kind of alloy structural steel which is stipulated by the Chinese national standard. Unified digital code: A50202
Implementation of standard 3077-1999 GB/T
Use
20CrNiMo steel quenching through higher, no temper brittleness, welding is quite good, the formation of cold cracking tendency is small, cutting and cold strain plasticity is good. Generally used in the condition of quenching and tempering or carburizing quenching.
20CrNiMo AISI, former USA steel in SAE 8720 steel. The quenching performance is similar to 20CrNi steel. Although the Ni content in the steel is half of the 20CrNi steel, but due to the addition of a small amount of Mo, the Austenite Isothermal Transformation Diagram of upper shifted to the right; and because of the appropriate increase of Mn content, resulting in the steel quenching permeability is still very good strength than steel 20CrNi. Commonly used in gear manufacturing small cars, tractor engine and transmission system; can replace 12crni3 steel manufacturing requirements of heart, higher performance of carburizing, cyaniding pieces, such as oil drilling and metallurgical open pit mine roller bit tooth and claw and cone body. 20CrNiMo because of the addition of molybdenum has a good comprehensive performance, but also a certain temperature. Used in the manufacture of steam turbine rotor gear whole internal combustion engine connecting rod forging valve.
Chemical composition
Mass fraction (%):
Carbon:0.17 C ~ 0.23
Silicon Si:0.17 ~ 0.37
Mn Mn:0.60 ~ 0.95
S: allow residual sulfur content less than 0.035
P P: allow residual content less than 0.035
Chrome Cr:0.40 ~ 0.70
Nickel Ni:0.35 ~ 0.75
Mo Mo:0.20 ~ 0.30
Cu: allow residual copper content is less than 0.30
Mechanical properties
Heat treatment
Quenching heating temperature (c): 850
Tempering heating temperature (c): 200
The ultimate tensile strength of B (MPa): 980 (100)
Yield strength s (MPa): 785 (80)
5 elongation (%): 9
Section shrinkage (%): 40 psi
The impact of Akv (J): 47
The impact toughness value of alpha kV (J/cm2): 59 (6) (HBS100/3000) (Brinell hardness or high temperature tempering annealing state): less than 197
Delivery status: to heat treatment (normalizing, annealing or tempering) with or without heat treatment delivery, delivery status should be indicated in the contract.

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