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Rolling bearing parts timber, including timber and cage, rivets and other supporting material. The vast majority of rolling bearings and parts made of steel, bearing steel is usually high carbon chromium steel and hardened steel. With the development of modern science and technology and the increasing amount of scrolling NTN bearings, NTN bearings on the increasingly high demand, such as high precision, long life and high reliability. For some special purpose NTN bearings, NTN bearings also require materials with high temperature, corrosion-resistant, non-magnetic, ultra-low temperature, anti-radiation properties. In addition, NTN Bearing materials include alloys, non-ferrous metals and non-metallic materials. In addition, the use of ceramic materials have been used in the manufacture of NTN Bearing motorcycle, car, subway, aviation, aerospace, chemical and other fields.
    NTN Bearing rolling on the basic requirements of the material depends largely on the performance NTN bearings. Select the manufacturer NTN Bearing rolling material is appropriate, will have a great impact on its performance and life. Under normal circumstances, the main form of damage to rolling NTN Bearing fatigue spalling is in the cross under variable stress, as well as wear and tear due to friction loss leaving NTN Bearing accuracy. In addition, there are cracks, dents, corrosion and other damage caused abnormal NTN bearings. Therefore, the rolling bearing NTN should have a high resistance to plastic deformation, less friction and wear, a good rotation accuracy, good dimensional accuracy and stability, and long contact fatigue life. And many of the performance is determined by the material and heat treatment process of the joint decision. Because of the rolling bearing NTN basic requirement is the destruction of the material in the form of a decision by the NTN bearings, so they requested materials NTN Bearing rolling after a certain heat treatment process should have the following properties:
A high contact fatigue strength is the main form of contact fatigue damage NTN Bearing normal damage. When scrolling NTN bearings running, rolling in the NTN bearings, rolling between the outer ring raceway, the contact part of the bear cycle alternating loads more are up to hundreds of thousands of times per minute, repeated the role in the next cycle of alternating stress contact surface fatigue spalling. NTN Bearing began rolling after peeling NTN bearings will cause vibration, noise temperature increased sharply, resulting in a final NTN Bearing damage, this form of destruction known as contact fatigue damage. Therefore, the requirements NTN Bearing steel rolling contact fatigue should have a high intensity.
Two high wear resistance rolling bearing NTN work, in addition to the occurrence of rolling friction, but also with sliding friction. The main parts of the occurrence of sliding friction is: the contact surface between the rolling element and raceway, the rolling elements and maintain contact between the surface of the cage pockets, between the cage and the ring wall and the guide roller end ferrule guide etc. between the ribs. NTN Bearing rolling in the presence of sliding friction is inevitable that NTN Bearing parts produced wear. If NTN Bearing Steel poor wear resistance, rolling NTN bearings will wear prematurely due to loss of precision or accuracy decreases due to the rotation leaving NTN Bearing vibration increases, reduced life expectancy. Therefore, the requirements NTN Bearing steel should have high wear resistance.
The case of three high elastic limit when scrolling NTN Bearing work due to rolling and rolling rings small contact area between the track, NTN bearings when under load, especially in bear a greater load, the contact surface of the contact pressure is large. In order to prevent excessive contact stress under high plastic deformation, so that the accuracy of the loss or the occurrence of NTN Bearing surface cracks, therefore, requires NTN Bearing steel should have a high elastic limit.
Four suitable hardness hardness is an important indicator of the rolling bearing NTN. It comes in contact with the material fatigue strength, wear resistance, is closely related to the elastic limit, directly affects the life of rolling bearings NTN, NTN Bearing NTN Bearing hardness usually bear the load according to the manner and size, NTN Bearing dimensions and wall thickness The overall circumstances. NTN Bearing rolling steel hardness should be appropriate, too large or too small will affect NTN bearing life. As we all know, the main failure mode NTN Bearing rolling contact fatigue damage is, and because of poor or erratic wear size leaving NTN Bearing accuracy loss; NTN Bearing parts if certain lack of toughness, when will withstand greater impact loads due to the occurrence brittle fracture caused damage NTN bearings. Therefore, we must determine the hardness of NTN Bearing NTN Bearing depending on the circumstances and the manner destruction. In the case of wear due to fatigue spalling or loss of accuracy errands NTN Bearing, NTN Bearing parts should be used in high hardness; For NTN Bearing withstand greater impact loads (eg mill: NTN bearings, railway bearings and NTN NTN Bearing some car etc.), should be appropriately reduced in order to improve the hardness of NTN Bearing toughness is essential.

Five a lot of rolling a certain toughness in the course of NTN Bearing will receive? Given the impact load, thus requiring NTN Bearing steel has a certain toughness to ensure NTN Bearing not because of the impact damage. For NTN Bearing withstand greater impact loads such as mill NTN bearings, NTN bearings and other requirements of railway material has a relatively high impact toughness and fracture toughness, some with these NTN Bearing bainite hardening heat treatment process, some with hardened steel material, is to ensure that these NTN Bearing has good resistance to impact toughness.
Six good dimensional stability scroll NTN bearings are precision machine parts, its accuracy is micron dollars. In the long-term storage and use, or stress changes due to changes in the internal tissue can cause changes in the size of NTN bearings, NTN bearings lead to loss of precision. Therefore, to ensure dimensional accuracy NTN bearings, NTN Bearing steel should have good dimensional stability.
 Seven good rust resistance rolling bearing NTN many production processes, longer production cycles, and some semi-finished or finished parts need longer storage time before the assembly, therefore, NTN bearing parts in the production process or stored in the finished product some are prone to corrosion, especially in the humid air. Therefore, the requirements of NTN Bearing steel to have a good anti-rust properties.
 Eight good process performance NTN Bearing rolling in the production process, after many of its parts to cold, heat processing operations. This requires that NTN Bearing steel should have good process performance, such as cold, hot forming properties, cutting, grinding and heat treatment processing performance capability and so on, in order to adapt the rolling bearings NTN large volume, high efficiency, low cost and high quality production needs.
In addition, under special working conditions for use of NTN bearings, in addition to the above a few basic requirements, must also be made of steel corresponding to their specific performance requirements, such as high temperature performance, high-speed performance, corrosion resistance and magnetic properties.