NTN bearing smelting requirements discussion

timer Asked: Feb 7th, 2014

Question Description

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 

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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 

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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 requirements

General 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.

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