1 foreign-resistant bearing steel DCJ2
For automotive transmission and differential bearing device, because of the oil mixed with foreign matter (mud, cutting powder), once this foreign matter into the bearing rolling surface bite will produce rolling surface indentation caused by the early peeling through the development of resistance to foreign bearing steel.
Foreign environment through mixed reproduction of rolling fatigue test, the results of discussion is to improve the environment, mixed with foreign matter bearing life by increasing the amount of retained austenite in the surface and improve the surface hardness or toughness of the matrix with the results.
Developed to add more than 2% of the Mn-resistant bearing steel DCJ2 foreign body in the quenched state of resistance to rolling fatigue life of foreign oil with clean SUJ2 rolling fatigue life compared with its high amount of retained austenite, under the conditions of the foreign matter shown with the same oil in a clean excellent rolling fatigue life, has made it clear DCJ2 nitrating steel with carburized same excellent resistance to foreign life.

 2 High temperature bearing steel STJ2
With the car engine's power output continues to improve, and industrial machinery and closure of high-speed, bearing temperature rise in the use of the environment. Hoping to develop in the 473 ~ 523K temperature to maintain the performance of the bearing. In this temperature range, if the implementation of the quenching of SUJ2, its hardness is reduced, rolling life characteristics deteriorate. On the other hand, although the jet engines used for the precipitation hardening steel-M50 at the same temperature range with a full roll life, but the alloy contains about 10% of Cr, Mo, V and other alloying elements, so the high cost of materials , heat treatment is complex, the lack of versatility. Therefore, the development of the high amount of alloying elements added to a minimum, taking into account the heat treatment and processing of high-temperature bearing steel targets as improved quenching hardness, improved resistance to temper softening under high temperature to prevent softening of the effective of.
The company investigated the alloying elements on the hardness of quenched and tempered hardness; quenching hardness to improve the use of the C element is used to improve anti-temper softening of Si element. Therefore, comparison of the bearing steel SUJ2, the development of C and Si content increased to prevent high temperature hardness decreased, by adding Ni element to keep rolling as the high-temperature properties of materials STJ2 bearing steel.



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