20CrNiMo Gear Steel Bar

 

20CrNiMo is China GB grade structural alloy steel. 20CrNiMo steel has high hardenability, no temper brittleness, good weldability, low tendency to form cold cracks, good machinability and cold strain plasticity. Generally used in quenched and tempered or carburized and quenched state, it is used to manufacture high-pressure pipes and various fasteners that work in non-corrosive media and media containing nitrogen and hydrogen mixtures with a working temperature of less than 250 ℃, and higher-level infiltration Carbon parts, such as gears, shafts, etc.

 

20CrNiMo steel was generated by following American  AISI and SAE standards grade number 8620. Hardenability is similar to 20CrNi steel. Although the Ni content in the steel is half that of 20CrNi steel, the addition of a small amount of Mo makes the upper part of the austenite isothermal transformation curve shift to the right; and the appropriate increase in Mn content results in the steel's hardenability and strength. It is also higher than 20CrNi steel. 

 

Commonly used in the manufacture of gears in the engines and transmission systems of small and medium-sized cars and tractors; it can also replace 12CrNi3 steel to manufacture carburized parts and cyanide parts that require high core performance, such as roller cone bits for petroleum drilling and metallurgical open-pit mines Claws and cones. Because 20CrNiMo contains molybdenum, besides having good comprehensive performance, it can withstand a certain temperature. Used in the manufacture of gear forgings of whole-rotor internal combustion engine connecting rod and valve section for steam turbines.

 

Chemical Composition:

 

CSIMnSPCrNiMoCu
0.17~0.230.17~0.370.60~0.95≤0.035≤0.0350.40~0.700.25~0.750.20~0.30≤0.30

 

Mechanical Properties:

 

Tensile strength (N/mm2Mpa): Yield strength:   Elongation:  Hardness:  Reduction of area:Akv(J): 63 akv(J/cm2)
≥1175(120) ≥1080(120) ≥10 ≤269HB ≥45  ≥78(8)

 

 

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