NSK bearing fatigue life of exposure on microstructure uniformity of steel is very sensitive. Improving cleanliness (reducing the content of impurities and inclusions in the steel), non-metallic inclusions in steels and carbides small evenly, improving NSK contact fatigue life of bearing steel. Bearing steel using state of the Organization should be distributed evenly tempered Martensitic matrix in small carbide particles, so organizations can give bearing steel for the performance you need. High carbon bearing steel is the main alloying elements are carbon, Silicon, manganese, chromium, vanadium, and so on.
Because of NSK bearings should have a long life, low heat, high speed, high precision, high rigidity, low noise, high wear resistance and other features, and therefore requires a bearing steel with: uniform high hardness, high hardness, high elastic limit, must contact fatigue strength, toughness, hardenability, certainly in atmospheric corrosion-resistant performance of lubricants. In order to achieve the above performance requirement, NSK bearing steel and chemical composition of uniform, non-metallic inclusions content types, carbide particle size and distribution, removal of carbon and so demanding.
To adapt to high temperature, corrosion-resistant, resistant to high speed, high load and requirements of radiation, you need to design a series of new NSK bearing steel with special properties. In order to reduce the oxygen content of NSK bearing steel, developed a vacuum melting, electroslag remelting, NSK bearing steel smelting, such as electron beam remelting technology. Large melting in NSK bearing steel smelting electric arc furnace, developed into various types of furnace and furnace refining at the beginning.
In terms of heat treatment, improve the quality of spheroidizing annealing, access to small, uniform, spherical carbon and reducing annealing time or cancel there has been progress in the study on the spheroidizing annealing process, namely wire rod production using two organization of simulated annealing, drawing 720 ?? ~730 ?? after recrystallization annealing annealing 760 ° c instead of organization. So you can get low hardness, good, no organization of reticular carbide of the ball, the key to ensure the Middle drawing area reduction rate ≥ 14%. This process allows improved efficiency of heat treatment furnace 25%~30%. Continuous spheroidizing annealing process technology is the development direction of the NSK bearing steel heat treatment.
NSK bearing steel in the future mainly to the performance of high cleanliness and variety development in both directions. Improve cleanliness in bearing steel, in particular reducing oxygen content in steel, can significantly extend the life of NSK bearings. Reduced oxygen content from 28ppm to 5ppm, fatigue life can be extended by 1 order of magnitude. In order to extend the life of bearing steel, it has for many years been committed to the development and application of refining technology to reduce oxygen content in steel.
Other News:
Sand steel mid-June partial product price policy
NSK bearing steel technology and directions
Replaces when the NTN import bearing the oil quality steam and the skin contact
INA bearing knocked-down and assemble skill maintenance method
The KOYO unidirectional bearing and the shoulder depend on the tight degree
How judges the NSK cylindrical roller bearing use question through the sound
The reducing the interest rate surpasses the market anticipated to favor the st
The IKO import bearing use frequently asked questions and install the method
