the refining requirements of high-quality NSK bearing materials
Most favorable price : sales@hellerbearings.com
First, the strict chemical composition requirements
General NSK bearing steel is high carbon chromium bearing steel, the carbon content of about 1 percent, adding about 1.5% chromium, and contains small amounts of manganese, silicon over-eutectoid steel. Only strict control of the content of the chemical composition of the NSK bearing steel, only through thermal disposal processes meet the microstructure and hardness of the performance of NSK Bearings.
Second, the size requirements of the stringent precision
The rolling bearing steel require high dimensional accuracy, this is because most of the NSK bearing parts go through the pressure molding. In order to save raw materials and improve labor productivity, the vast majority of NSK bearing rings must be forged to shape, the ball is cold heading or hot forming, the small size of the roller is cold heading forming. If the steel is not high dimensional accuracy, it is impossible to accurately calculate the size and weight of the cutting, and thus can not guarantee the product quality of NSK Bearings Parts, are likely to cause damage to manufacturing equipment.
Third, in particular the strict purity requirements
The purity of the steel is refers to the steel of impurities, the higher the purity, non-metallic inclusions in steel, the less. Oxides, silicates, and other harmful impurities in bearing steel and NSK Bearings early fatigue spalling, NSK Bearings reduced life of a great relationship. Brittle impurities harm, seriously affecting the quality of the appearance of the NSK Bearings finishing flaking off easily from the metal substrate during processing.
Fourth, the organizational requirements of a strict low magnification microscopy (high power)
Low magnification of the bearing steel refers to the generally loose, center porosity and Annealing of flat analysis, microscopy (high power) organizations, including steel, carbide mesh, ribbon and liquid analysis and so on. Carbide liquation hard and brittle, the dangers of brittle inclusions the same. Carbide network to reduce the impact toughness, and uneven quenching are susceptible to deformation and cracking. The ribbon carbides affect the annealing and quenching and tempering the organization and contact fatigue strength.
Fifth, external defects and internal defects are particularly stringent requirements
NSK bearing steel, external defects, including cracks, folder slag, burrs, scarring, and the oxide skin, and internal defects including shrinkage, bubble, white spots, severe osteoporosis and segregation. Processing of these defects on the bearing, NSK bearing performance and life have a great impact, NSK bearings specification explicitly does not permit these defects.
Sixth, the particularly stringent requirements carbide of
NSK bearing steel, if there is serious carbide uneven distribution of thermal disposal process, it is easy to cause non-uniform microstructure and hardness, the inhomogeneity of the steel had a greater influence on the contact fatigue strength.
Seventh, the particularly strict appearance decarburized layer requirements
NSK Bearings specification has strict rules decarburized layer of steel appearance appearance decarburized layer does not comply with the provisions of the standard range, and before heat treatment process, not all removed, the quenching process of thermal disposal prone to quenching cracks, resulting in scrapped parts.
Eighth, the other requirements
The material specification of the bearing steel bearing steel smelting, oxygen content, annealing hardness, fracture, and the remaining elements, spark test, delivery status, logos and other stringent requirements.
234407BM 234706BM 234406BM 517/2860V/YA 5610/2500 517/1720X1V 527/1181M 510/1180M 517/930 510/670 590/560 510/500 52780 59080 517/368M 51760U 517/238 6207-2ZN 6206-2ZN 6205-2ZN 6204-2ZN 6203-RZ 6203-2ZN 6202N 6202-2ZN 6201-2ZN 6200ZZ 6200-2ZN 62/32-ZN 62/32-Z 62/32N 62/32-2Z 62/32-2RZ 62/32-2RS 62/28-2RZ 62/22-2RZ 61996 61992 61988 61984
We can provide free samples . Please contact Email for any inquiries
NSK bearing steel with the characteristics of the smelting quality requirements are much stricter than the average industrial steel such as steel, chemical composition, purity, organization and structure uniformity.First, the strict chemical composition requirements
General NSK bearing steel is high carbon chromium bearing steel, the carbon content of about 1 percent, adding about 1.5% chromium, and contains small amounts of manganese, silicon over-eutectoid steel. Only strict control of the content of the chemical composition of the NSK bearing steel, only through thermal disposal processes meet the microstructure and hardness of the performance of NSK Bearings.
Second, the size requirements of the stringent precision
The rolling bearing steel require high dimensional accuracy, this is because most of the NSK bearing parts go through the pressure molding. In order to save raw materials and improve labor productivity, the vast majority of NSK bearing rings must be forged to shape, the ball is cold heading or hot forming, the small size of the roller is cold heading forming. If the steel is not high dimensional accuracy, it is impossible to accurately calculate the size and weight of the cutting, and thus can not guarantee the product quality of NSK Bearings Parts, are likely to cause damage to manufacturing equipment.
Third, in particular the strict purity requirements
The purity of the steel is refers to the steel of impurities, the higher the purity, non-metallic inclusions in steel, the less. Oxides, silicates, and other harmful impurities in bearing steel and NSK Bearings early fatigue spalling, NSK Bearings reduced life of a great relationship. Brittle impurities harm, seriously affecting the quality of the appearance of the NSK Bearings finishing flaking off easily from the metal substrate during processing.
Fourth, the organizational requirements of a strict low magnification microscopy (high power)
Low magnification of the bearing steel refers to the generally loose, center porosity and Annealing of flat analysis, microscopy (high power) organizations, including steel, carbide mesh, ribbon and liquid analysis and so on. Carbide liquation hard and brittle, the dangers of brittle inclusions the same. Carbide network to reduce the impact toughness, and uneven quenching are susceptible to deformation and cracking. The ribbon carbides affect the annealing and quenching and tempering the organization and contact fatigue strength.
Fifth, external defects and internal defects are particularly stringent requirements
NSK bearing steel, external defects, including cracks, folder slag, burrs, scarring, and the oxide skin, and internal defects including shrinkage, bubble, white spots, severe osteoporosis and segregation. Processing of these defects on the bearing, NSK bearing performance and life have a great impact, NSK bearings specification explicitly does not permit these defects.
Sixth, the particularly stringent requirements carbide of
NSK bearing steel, if there is serious carbide uneven distribution of thermal disposal process, it is easy to cause non-uniform microstructure and hardness, the inhomogeneity of the steel had a greater influence on the contact fatigue strength.
Seventh, the particularly strict appearance decarburized layer requirements
NSK Bearings specification has strict rules decarburized layer of steel appearance appearance decarburized layer does not comply with the provisions of the standard range, and before heat treatment process, not all removed, the quenching process of thermal disposal prone to quenching cracks, resulting in scrapped parts.
Eighth, the other requirements
The material specification of the bearing steel bearing steel smelting, oxygen content, annealing hardness, fracture, and the remaining elements, spark test, delivery status, logos and other stringent requirements.
