ABT bearing Limited Company was founded in 1998,With Buy TIMKEN Bearings Online in stock with an favorable price,ABT has build worldwide sourcing bearing network,Following with imported bearing experts for customers to solve professional problems and many improted bearing brand to satisfy customers’ different needs.Which can provide all variety of bearing,consists of Ball Bearing Series:Deep Groove Ball,Thrust Ball(Single Row Double-Directino/Doubel Row Single-Direction),Radial Ball,Self-aligning Ball,Filling Slot Ball,Counterbored Ball,Three/Four Point Contact Ball.Roller Bearing Series:Spherical Roller,Radial Roller,Cylindrical Roller,Tapered Roller,Needle Roller,Drawn Cup Needle Roller,Convex Roller,Concave Roller,Crossed Roller,Thrust Roller,Cylindrical Roller Thrust,Tapered Roller Thrust,Needle Roller Thrust,Spherical Thrust Roller.ABT Bearing Seals Type and Row contain:RS,2RS,Z,2Z,2RZ,DDU,LLU,VV;Single-Row,Double-Row,Four-Row.ABT Bearing Centry have following original brand:SKF,FAG,NSK,TIMKEN,NTN,NACHI,IKO,INA,KOYO,FYH and so on.They come from Swenden,Germany,France,Italy,Britain,Austria,Netherlands,Spain,Japan,India,Malaysia,Indonesia,Korea,China,Iran,Saudi Arabia,USA,Canada,Brazil,Mexico and other country in European/Asia and North America/South America.ABT Bearing website provide Structure、Dimensions、Net Weight and all Parameter and Details of all kind of bearings.Today we will talk about High quality of the NTN bearing smelting requirements for material.The quality of the rolling bearing large level and quality of the NTN bearing steel are closely linked. Due to the nature of NTN bearing steel is, the requirement of smelting quality is much more strict than general industrial steel, such as chemical composition of steel, purity, organization and structure uniformity, etc.First, the chemical composition of strict requirementsGeneral NTN bearing steel high carbon chromium bearing steel, the carbon content is about 1%, to 1.5% chromium, and contains a small amount of manganese and silicon hypereutectoid steel. Chromium heat treatment can improve performance, increase the hardenability, uniformity, tempering stability, and can improve the anti-corrosion properties of steel and grinding performance. But when the chromium content more than 1.65%, after quenching can increase the residual austenite in the steel, reduce the hardness and size stability, increase the inhomogeneity of carbide lower impact toughness and fatigue strength of steel. To this end, the chromium content of high carbon chromium NTN bearing steel general control under 1.65%. Only strict control of chemical composition in NTN bearing steel, can only through the heat treatment process for meet the NTN bearing performance of the organization and hardness.