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15Cr


15Cr, alloy structural steel, which is a commonly used low-carbon alloy carburizing steel, can significantly increase the surface carbon content and carburizing depth during carburizing, but has the tendency of grain growth and formation of network carbide during high temperature and long time carburizing; For parts with simple shape and low requirements, they can be directly cooled and quenched after carburization, but the deformation after heat treatment is large and there is temper brittleness. The hardenability of steel is higher than that of 15 # carbon steel. The critical hardenability diameter in oil is 2~15mm, and the critical hardenability diameter in water is 6~29mm. In addition, the steel has high cold deformation, good weldability and good machinability under annealing condition. It is mainly used for manufacturing parts with high working speed, small cross section but high requirements for strength and toughness of the core, and wear on the surface, such as gears, cams, slide valves, pistons, bushing crank pins, piston ring couplings, shafts, bearing rings, etc., and also can be used as low-carbon martensitic quenched steel to manufacture parts with low requirements for deformation but strength and toughness.

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