Performance requirements of bearing steel, bearing steel material

Bearing steel is mainly used in the manufacture of rolling bearings of rolling body and ring. Because of the bearing should have long life, high precision, low calorific value, recommend suite, high rigidity, low noise, high abrasion resistance and other characteristics, therefore requires bearing steel should have: high hardness, uniform hardness, high elastic limit, high contact fatigue strength, must toughness, hardenability, in atmospheric corrosion resistance of lubricant. In order to achieve the performance requirements, the uniformity of the chemical composition of bearing steel, non-metallic inclusion content and type, strict carbide particle size and distribution, decarburization, etc. Bearing steel in general to develop in the direction of high quality, high performance and many varieties. According to the characteristics and application environment of bearing steel is divided into: high carbon chromium bearing steel, high temperature carburizing bearing steel, bearing steel special bearing, stainless bearing steel and special materials. In order to adapt to high temperature, high speed, high load, corrosion resistance, resistance to radiation, need to develop a series of new type of bearing steel with special performance. To decrease the oxygen content of bearing steel, the development of the vacuum smelting, esr, electron-beam remelting of bearing steel smelting technology. And the mass of bearing steel smelting electric arc furnace smelting, early developed into all kinds of smelting and refining outside the furnace. At present, the use of early capacity greater than 60 tons + LF/VD and RH refining furnace, continuous casting and rolling process of bearing steel production, in order to achieve the purpose of high quality, high efficiency, low energy consumption. In terms of heat treatment process, from the car type furnace, bell type furnace developed into the continuous controlled atmosphere heat treatment of annealing furnace. At present, the longest continuous type heat treatment furnace is 150 m, processing production of bearing steel spheroidizing stable and uniform, the decarburization layer is small, low energy consumption. The performance of the bearing steel should have the following: 1, high contact fatigue strength. 2, high wear resistance. 3, high elastic limit and yield strength. 4, high and even hardness. 5, a certain impact toughness. 6, good dimensional stability. 7, good corrosion inhibition. 8, the good process performance. Common material: bearing steel bearing steel quality also need to choose the specific requirements for selection, for special work under the condition of bearing material, according to its specific requirements should also have its conditions appropriate to the special performance, such as: high temperature resistant, low temperature resistance, corrosion resistance, anti radiation, magnetic properties, etc. The hardening high carbon chrome steel, bearing steel GCr15, its carbon content 1% the left and right sides, chromium content 1. About 5%. In order to improve the hardness, wear resistance and hardenability, appropriate to join some silicon, manganese, molybdenum, such as GCr15SiMn. This kind of bearing steel production is the largest, account for more than 95% of all bearing steel production. Carburizing bearing steel is carbon content is 0. 08 ~ 0. 23% of chromium, nickel, molybdenum alloy structural steel, made of bearing parts after surface of carbonitriding, to increase the hardness and wear resistance, the steel used in the manufacture of large bear strong impact load bearing, such as a large rolling mill bearing, auto bearing, mill bearing and railway vehicle bearing, etc. Stainless bearing steel with high carbon chromium stainless shaft ChengGang, such as 9 cr18, 9 cr18mov, and carbon chromium stainless bearing steel, such as 4 cr13, used to make stainless bearing corrosion. High temperature bearing steel is in the high temperature ( 300～500℃） Used for steel in the use of temperature has certain red hardness and wear resistance, high speed tool steel is chosen mostly substitute, such as W18Cr4V, W9Cr4V, W6Mo5Cr4V2, Cr14Mo4 and Cr4Mo4V, etc.