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Talking about the special raw materials used in NTN bearing
Source: Bearing network time: 2014-03-03
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1) High/medium carbon steel alloy steel data diversification; it can not only be hardened for external surface treatment; the same can also be used for deep hardening treatment; it is called “fully quenchedâ€; it is used for raceway and roll body. High carbon chromium Bushing steel is the best information for rolling bearings; and it is widely used. Large imported bearings and imported bearings with large cross-sections are mostly made of hardenable steel; it is rich in magnesium or molybdenum. Carbon chromium steel is also used; Rich in barium and magnesium; its hardness can be compared with high carbon chromium bearing steel.
2) Carburized steel Carburized steel only carburizes in the proper depth scale of the outer surface layer; constitutes the hardened layer; and the hardness of the middle part is low. Therefore, the hardness is high and the resistance is good; the impact resistance function is good; the NTN is almost all the tapered roll The sub-bearings are all made of carburized steel. Other small and medium-sized bearings are mostly made of chrome steel; and chrome-molybdenum steel.
3) High-carbon bearing steels of high-temperature bearing steels; through standard heat treatment; if used at temperatures above 120 °C for a long time; there will be scale changes that cannot be tolerated. To this end; in high temperature environments; NTN advocates the use of scales A stable bearing. However, this treatment will reduce the hardness of the data; reduce the fatigue life of NTN bearings.
For high temperature imported bearings from 150 ° C to 200 ° C; participate in bismuth in steel; it provides excellent fatigue life and minimizes dimensional changes and hardness reduction at high temperatures.
There are also many high-temperature data that can minimize the scale change and hardness drop at high temperatures. The two are tungsten high-speed tool steel and molybdenum high-speed tool steel. When NTN bearings are used at high speed and high temperature.
4) Anti-rust bearing steel in the case of high demand for rust prevention; use of stainless steel; to achieve the role of rust prevention; NTN participates in a lot of chromium in martensitic stainless steel.
5) Induction heating and quenching steel imported bearing raceway in addition to the above hard-disposed steel; can also use induction heating hardened steel. Medium carbon chromium-molybdenum steel is suitable for the treatment of large-scale imported bearings with large demand of quenched layers or NTN bearings with large external dimensions.
6) Other bearing data Ultra-high speed NTN bearings require high corrosion protection; NTN has ceramic bearing materials to choose from.
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