Q: What are the grades, characteristics and uses of commonly used carburizing bearing steels?

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Accepted Answer

Bearing steel grade	Feature	Application
G20CrMo	Low alloy carburized steel, the surface hardness after carburizing is relatively High, good wear resistance, low core hardness, toughness it is good. Suitable for making bearings resistant to impact loads and Parts.	It is often used as the impact resistance of cars and tractors. Impact load roller bearings, also used as steam Car gears, piston rods, bolts, etc.
G20CrNiMo	Have good plasticity, toughness, and strength, carburizing or After carbonitriding, the surface has quite high hardness and resistance Good grind ability, contact fatigue life is obviously better than GCr15 steel, the core carbon content is low, there is enough Toughness to withstand impact loads.	Good material for making impact-resistant bearings Material, which can be used as steam to withstand impact load Car bearings and small and medium-sized bearings are also available Make automobile, tractor gears, and cone drills The claws and cones of the head.
G20CrNi2Mo	After carburizing, the surface hardness is high, the wear resistance is good, and it has Moderate surface hardening, good heart toughness, and resistance Impact load, the cold and hot working plasticity of steel is better, It can be processed into rods, plates, strips, and seamless steel pipes.	Rollers used to withstand higher impact loads Bearings, such as railway freight car bearing rings and Rollers, also used as car gears and pistons Rods, universal joint shafts, and round head bolts, etc.
G10CrNi3Mo	After carburizing, the surface has high carbon content and high hardness, Good wear resistance, the low carbon content in the heart, good toughness, Can withstand impact loads.	Used for large-scale Roller bearings. Such as rolling mill bearings.
G20Cr2Ni4A	Common carburized structural steel is used to make bearings. The carbon back surface has quite high hardness, wear-resistance and High contact fatigue strength, good heart toughness, and resistance Strong impact load. Medium weldability, with tempering Tendency to brittleness, more sensitive to the formation of white spots.	Making large bearings resistant to impact loads, Such as rolling mill bearings, etc., but also used for other Large carburized parts, such as large gears, shafts Etc., it can also be used for manufacturing requirements of toughness High tempered parts.
G20Cr2Mn2MoA	After carburizing, the surface hardness is high, the core toughness is good, and it can be Resistant to strong impact load, phase with G20Cr2Ni4A Compared with the carburizing speed, the carburized layer is easier to form a coarse Large carbides are not easy to diffuse and eliminate.	Used to work under high impact load conditions Extra-large and medium-sized bearing parts and shafts And gears, etc.