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With the 1 high temperature bearing steel STJ2
With the continuous improvement of the output power of an automobile engine and industrial machinery high-speed and closed, bearing the use of the environment temperature rise. To develop the bearing retaining properties in 473 ~ 523K temperature. In this temperature range, if the use of the implementation of the quenching and tempering treatment SUJ2, its hardness will reduce, rolling life characteristics of variation. On the other hand, although for precipitation hardening alloy steel -M50 jet engine with rolling life fully in the same temperature range, but the alloy contains about 10% of the Cr, Mo, V and other alloy elements, so the material cost is high, the heat treatment is complex, the lack of universal. Therefore, the development of alloy elements at high prices make the addition amount of control at a minimum, taking into account the high temperature bearing heat treatment and machining of steel as the work goal of improving the quenching hardness, improve the anti temper softening for preventing softening under high temperature condition is effective.
The company investigated the effect of alloy elements on the quenching hardness and tempering hardness, in order to improve the quenching hardness using the C element, in order to improve the anti temper softening by using the Si element. Therefore, for bearing steel SUJ2 comparison, increase the content of C and Si is developed to prevent the decrease, steel used by adding Ni element to keep rolling properties of material STJ2 as high temperature bearing high temperature hardness.