Date: 2013-08-22

Influence of cleanliness for INA bearing

Purity of bearing steel is the degree of contamination of non-metallic inclusions on steel. Non-metallic inclusions of bearing steel matrix substances, disrupted the continuity of the substrate, it leads to early fatigue, spalling of INA bearings one of the main reasons. Therefore, the requirements of non-metallic inclusions in bearing steel the fewer, the better. In order to limit and control the existence of non-metallic inclusions in steel, in the relevant standards, to a strict level of control for them. Manufacturers in addition to the use of electric furnace smelting with electro-slag remelting external, also adopts electric furnace smelting and deoxidation external refining, vacuum, argon, external spray powder processing technology, seeks to reduce oxygen content in steel to 20ppm.
1) surface: molding method of bearing parts, there are currently forging, such as turning and pressing Dise. Based on different molding methods on surface quality of steel products with varying degrees of requirements. In General, there shall be no crack on bearing steel surface, folding, pull cracked, scarred and slag. On pressing Dise for cold-drawn steel, with the exception of such defect is not allowed outside, surface you want to clean, no rust, AU and other defects. Bearing steel surfaces without serious decarbonization phenomena, depending on the INA bearing parts forming process requirements in the relevant standards, decarburized layer depth of steel surfaces for different varieties have different restrictions.
2) dimensions allowed tolerances: according to INA bearing parts forming technology and steel production technology, standards, on bearing steel dimension tolerance of various varieties, specifications are provided. Forged steel dimension tolerance in General according to the GB908-72 standard, size tolerances according to GB 702-86 hot-rolled steel, cold-drawn steel according to GB 905-82 standard, cold-drawn steel wire according to the YB245-64 standard.  

Previous: Analytic TIMKEN bearing characteristics of the type of
Next: KOYO bearings running in the process of peeling off

Hot Products:

Product Model	Inside Diameter	Outside Diameter	Thickness
7936CDF NSK	180	250	33
7334BDF NSK	170	360	72

【TradeBearings News Statement】

1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"TradeBearings".
3.For investors,please be cautious for all news.We don't bear any damage brought by late and inaccurate news.
4.If the news we published involves copyright of yours,just let us know.