Bearing rings and rolling elements materials

1) High carbon chromium bearing steel High carbon chromium bearing steel specified in JIS is used as a general material in bearing rings (inner rings, outer rings) and rolling elements (balls, rollers).Their chemical composition classified by steel type is given in “Table 13-1 Chemical composition of high carbon chromium bearing steel”.Among these steel types, SUJ 2 is generally used. SUJ 3, which contains additional Mn and Si, possesses high hardenability and is commonly used for thick section bearings.SUJ 5 has increased hardenability, because it was developed by adding Mo to SUJ 3.For small and medium size bearings, SUJ 2 and SUJ 3 are used, and for large size and extra-large size bearings with thick sections, SUJ 5 is widely used.Generally, these materials are processed into the specified shape and then undergo hardening and annealing treatment until they attain a hardness of 57 to 64 HRC. 2) Case carburizing bearing steel (case hardened steel) When a bearing receives heavy impact loads, the surface of the bearing should be hard and the inside soft.Such materials should possess a proper amount of carbon, dense structure, and carburizing case depth on their surface, while having proper hardness and fine structure internally.For this purpose, chromium steel…

TBB News Flash–1ST Quarter 0f 2019
Industry News / 2019-03-28

There have a new bearing steel GCr9 appeared in the market,which supplying for Turkey, Poland and some other Europe countries after-market, let’s get the details of what material as below. From the bearing appearance, there is no difference between GCR9 and GCR15, but for the product performance, there have obvious difference. From the bearing appearance, there is no difference between GCR9 and GCR15, but for the product performance, there have obvious difference. Due to the difference of Cr element content, GCr15 have a better performance of wear resistance than GCr9, usually bearing of GCr15 material working life will be longer. . DANA and TBB have a project of needle roller bearing which applied for hydraulic motor. DANA technical and engineer person have inspected TBB Changzhou factory twice on Feb-26th and last December , and our factory satisfied their high quality OE market requests. . . The bearing world has become quite different in 2018 with the introduction of tariffs, price increase of steel in China, closure of factories due to environment issue and also sudden demand increase. Even though the demand levels have now come back to normal with the easing of steel supply as compared to before the cost…