20CrNiMo round 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 quenched state.
Chemical composition of 20CrNiMo round steelQuality score (%):
Carbon C: 0.17～0.23
Silicon Si: 0.17～0.37
Manganese Mn: 0.60～0.95
Sulfur S: allowable residual content≤0.035
Phosphorus P: allowable residual content ≤0.035
Chromium Cr: 0.40～0.70
Nickel Ni: 0.25～0.75
Molybdenum Mo: 0.20～0.30
Copper Cu: allowable residual content ≤0.30
Main features of 20CrNiMo round steel20CrNiMo steel was originally the steel number 8620 in the American AISI and SAE standards. 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 causes the upper part of the austenite isothermal transformation curve to shift to the right; and the appropriate increase of 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 automobiles 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 oil drilling and metallurgical open-pit mines Tooth claw and cone body. Because 20CrNiMo contains molybdenum, besides having good comprehensive performance, it can withstand a certain temperature. It is used to manufacture geared whole rotor internal combustion engine connecting rod valve section forgings of steam turbines.
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