Unique environmental bearing steel

Source: Bearing network time: 2017-10-16

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Bearings that are installed in machinery, such as automobiles, industrial machinery, home appliances, and information machines, need not only be lightweight and compact, but also need to improve the bearing function to get used to the harsh environment. To satisfy this need; Optimize data, heat treatment processes, shapes and scales; and work with users who use the data to pursue the integration of surrounding components.
Japan Datong Unique Steel Co., Ltd. has always been committed to developing bearing materials suitable for use in unique and harsh environments and heat treatment processes suitable for such materials. The following high temperature bearings developed by the company and bearing manufacturers have been put into practice. Steel and the company's separately developed steel for foreign body bearing bearing.
1. High temperature bearing steel STJ2
With the continuous improvement of the output power of the automobile engine and the high speed and shutdown of the industrial machinery; the ambient temperature of the bearing is increased. It is expected to develop a bearing that maintains the function at a temperature of 473 to 523 K. At this temperature scale; The SUJ2 treated by quenching and tempering will have a decrease in hardness; the characteristics of the rolling life will be deteriorated. On the other hand, although the split-hardening alloy steel-M50 used for jet engines and the like has a sufficient rolling life at the same temperature scale; The alloy is rich in about 10% of alloying elements such as Cr, Mo, V; so the cost of the data is high; the heat treatment is also messy; the versatility is short; therefore; the development will increase the amount of high-priced alloying elements to the lowest limit; High-temperature bearing steel for heat treatment and processability as a working principle to improve quenching hardness; progress against temper softening is useful to avoid softening under high temperature conditions.
The company inquired about the influence of alloying elements on quenching hardness and tempering hardness; utilized C element for improving quenching hardness; utilized Si element for improved anti-tempering softening; thus; for the comparison of bearing steel SUJ2; developed Increasing the content of C and Si to avoid the decrease of hardness at high temperature, and the STJ2 as a high-temperature bearing steel after increasing the Ni element's adherence to the tumbling characteristics.
2. Foreign body bearing steel DCJ2
Used in bearings for transmissions and differentials of automobiles; because foreign matter (sludge, cutting powder) is mixed into the oil; once this foreign matter bites into the rolling surface of the bearing, indentation causes early detachment of the rolling surface; Bearing steel.
The result of the experiment of resurfacing after tumbling in the foreign matter environment is to improve the service life of the bearing in the foreign matter environment; the amount of retained austenite in the appearance of the appearance, the improvement of the appearance hardness or the resistance of the substrate have a effect.
Developed to increase the resistance to foreign matter tumbling fatigue life of steel DCJ2 exceeding the 2% Mn in the quenched and tempered state and the fatigue life of the sanitary oil tumbling compared with SUJ2; its retained austenite amount is high; Under the conditions, it shows the same excellent tumbling fatigue life as in the sanitary oil; it has been clear that DCJ2 has the excellent resistance to foreign matter life of carburizing and nitriding steel.
Datong Unique Steel Co., Ltd. has carried out research work on the surface hardening treatment of high-temperature bearing steel STJ2 and foreign-resistant bearing steel DCJ2 steel; together with NTN, it has developed the application of heat-resistant carburized bearing steel with increased Si and Ni. Developed with external hardened steel with increased Mn resistance to foreign matter with better life characteristics than carburizing and nitriding treatment; it has been promoted to bearing manufacturers in Japan, the United States, and Europe.

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