High quality bearing smelting requirements
Most favorable price : sales@hellerbearings.com
First, the stringent requirements of the chemical composition
General NSK Bearings steel mainly carbon chromium bearing steel , which is about 1% carbon content , adding about 1.5 percent chromium , and contains a small amount of eutectoid steel manganese, silicon elements. Only strict control of the content of the chemical composition of the steel NSK bearings , NSK Bearings meet to qualify for the performance of the organization and hardness by heat treatment processes.
Second , strict dimensional accuracy requirements
Rolling steel requires high dimensional accuracy , this is because most of NSK Bearings parts go through pressure molding. In order to save raw materials and improve labor productivity , the vast majority of NSK Bearings must forging rings , balls are cold or hot rolled after forming, roller small size also after cold heading . If the dimensional accuracy of the steel is not high, you can not accurately calculate cutting the size and weight , and thus can not guarantee NSK Bearings parts of product quality, are likely to cause damage to the manufacturing equipment .
Third, the particularly stringent purity requirements
The purity of the steel is the number of impurities contained in the steel , the higher the purity , the less the non-metallic inclusions in steel . Content bearing steel oxides, silicates and other harmful impurities and early fatigue spalling NSK bearings , NSK Bearings reduced life of a great relationship . Especially the most harmful impurities brittle , due to come off easily from the metal substrate in the process , seriously affecting the quality of NSK Bearings appearance after finishing .
Fourth , strict low magnification and microscopic ( high power ) organizational requirements
Bearing Steel low magnification refers to the general loose, loose and flat center analysis, microscopy ( high power ) organizations, including organizations annealed steel , carbide mesh , ribbon and liquid analysis and so on. Liquation hard and brittle carbide , the same dangers and brittle inclusions. Carbide network to reduce the impact toughness , and to organize uniform, easy to deformation and cracking during quenching . Ribbon carbide annealing and quenching and tempering influence organizations and contact fatigue strength.
Fifth , the external and internal defects particularly stringent requirements
NSK Bearing steels for external defects, including cracks, slag , burrs , scarring, oxide and other internal defects, including shrinkage, bubbles, white spots , severe osteoporosis and segregation . These defects for machining the bearing , NSK Bearings performance and life have a great impact , NSK Bearings data specification clearly states do not allow the emergence of these defects.
Sixth, the carbide of particularly stringent requirements
NSK Bearings steel , carbide , if severe uneven distribution in the heat treatment process can easily result in non-uniform microstructure and hardness of steel tissue inhomogeneities have a greater impact on the contact fatigue strength.
Seventh, the appearance of particularly stringent requirements Decarburization
NSK Bearings data specification decarburization of the steel exterior has strict rules , if the appearance of decarburization standards do not meet the specified range , and in front of the heat treatment process nor removed in its entirety , then heat treatment quenching quenching process is prone to cracking , causing parts of scrapped.
Eighth, other requirements
Bearing steel material specification also bearing steel smelting method , oxygen content, annealed hardness , fracture , the remaining elements of the spark test , delivery status , identity , etc. , there are strict 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
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Because NSK Bearings steel with the characteristics of the smelting quality requirements are much stricter than the general industrial steel, such as the chemical composition of the steel , purity, uniformity of organization and structure .First, the stringent requirements of the chemical composition
General NSK Bearings steel mainly carbon chromium bearing steel , which is about 1% carbon content , adding about 1.5 percent chromium , and contains a small amount of eutectoid steel manganese, silicon elements. Only strict control of the content of the chemical composition of the steel NSK bearings , NSK Bearings meet to qualify for the performance of the organization and hardness by heat treatment processes.
Second , strict dimensional accuracy requirements
Rolling steel requires high dimensional accuracy , this is because most of NSK Bearings parts go through pressure molding. In order to save raw materials and improve labor productivity , the vast majority of NSK Bearings must forging rings , balls are cold or hot rolled after forming, roller small size also after cold heading . If the dimensional accuracy of the steel is not high, you can not accurately calculate cutting the size and weight , and thus can not guarantee NSK Bearings parts of product quality, are likely to cause damage to the manufacturing equipment .
Third, the particularly stringent purity requirements
The purity of the steel is the number of impurities contained in the steel , the higher the purity , the less the non-metallic inclusions in steel . Content bearing steel oxides, silicates and other harmful impurities and early fatigue spalling NSK bearings , NSK Bearings reduced life of a great relationship . Especially the most harmful impurities brittle , due to come off easily from the metal substrate in the process , seriously affecting the quality of NSK Bearings appearance after finishing .
Fourth , strict low magnification and microscopic ( high power ) organizational requirements
Bearing Steel low magnification refers to the general loose, loose and flat center analysis, microscopy ( high power ) organizations, including organizations annealed steel , carbide mesh , ribbon and liquid analysis and so on. Liquation hard and brittle carbide , the same dangers and brittle inclusions. Carbide network to reduce the impact toughness , and to organize uniform, easy to deformation and cracking during quenching . Ribbon carbide annealing and quenching and tempering influence organizations and contact fatigue strength.
Fifth , the external and internal defects particularly stringent requirements
NSK Bearing steels for external defects, including cracks, slag , burrs , scarring, oxide and other internal defects, including shrinkage, bubbles, white spots , severe osteoporosis and segregation . These defects for machining the bearing , NSK Bearings performance and life have a great impact , NSK Bearings data specification clearly states do not allow the emergence of these defects.
Sixth, the carbide of particularly stringent requirements
NSK Bearings steel , carbide , if severe uneven distribution in the heat treatment process can easily result in non-uniform microstructure and hardness of steel tissue inhomogeneities have a greater impact on the contact fatigue strength.
Seventh, the appearance of particularly stringent requirements Decarburization
NSK Bearings data specification decarburization of the steel exterior has strict rules , if the appearance of decarburization standards do not meet the specified range , and in front of the heat treatment process nor removed in its entirety , then heat treatment quenching quenching process is prone to cracking , causing parts of scrapped.
Eighth, other requirements
Bearing steel material specification also bearing steel smelting method , oxygen content, annealed hardness , fracture , the remaining elements of the spark test , delivery status , identity , etc. , there are strict requirements.
