A high carbon chromium bearing steel
Countries around the world are the equivalent of GCr15 just as the basis for the bearing steel to improve hardenability direction to accommodate the needs of the thick-walled bearing parts, the mass fraction of its approach is appropriate increase in the composition of molybdenum (0.1%, 0.2% ... 0.6%), chromium mass fraction is adjusted slightly or remain unchanged, thereby developing a series of high hardenability of high carbon chromium bearing steel. These steels is not only applicable to martensitic hardening, also applies to the bainite hardening of thick-walled bearing parts.
Carbon chromium bearing steel, another development is appropriate to reduce the hardenability, and subjected to a medium frequency induction heating, and rely on hardenability is limited and the overall quenching only surface hardening. The advantages of both carburizing steel carburizing, but also save the cost of steel alloy carburizing steel and the high cost of carburizing. Bearing steel rail to get very good results.
(2) chromium bearing steel
Chromium bearing steel is developed by China according to the characteristics of domestic resources instead of chromium bearing steel steel, including the number of GSiMnV, GSiMnMoV, GSiMnMoV, GSiMnMoVR, GMnMoV, GMnMoVR six kinds of steel. They have good hardenability and hardenability, and resistance to contact fatigue properties and wear resistance. Compared with the chromium bearing steel, the surface decarburization sensitivity is slightly larger, the corrosion inhibition properties and machining performance of low achievers, but to take appropriate measures, the use of such steel instead of chrome bearing steel production bearing is entirely feasible.
(3) the carbon bearing steel
Foreign bearing steel academia that the main role of the alloying elements in the bearing steel to improve hardenability, high strength, high hardness, wear resistance, fatigue performance is the role of the carbon element. Vacuum degassing technology into today, the purity of carbon steel, the same can also be greatly improved, its performance can meet the requirements for the small wall thickness of bearing high-carbon steel by vacuum degassing. Further extend the range of the carbon steel trend.
4 carburizing bearing steel
With the development of high-speed aircraft engines, the fracture toughness of the hardened steel can not meet the requirements. To this end the United States to develop high-temperature carburizing bearing steel M50NiL particularly good fracture toughness, high temperature performance of high-speed performance impact toughness wear resistance, fatigue resistance are very superior. In ultra M50NiL carburizing steel.
(5) stainless bearing steel
Coarse carbide 9Gr18 stainless steel is harmful and abroad committed to reduce the carbon mass fraction of ~ 0.7 to 0.5, improve the comprehensive performance of the 9Gr18 steel. Some countries are put into a larger force for the study of nitrogen-containing stainless steel. United States, Germany to jointly develop a Cronidur30 nitrogen stainless bearing steel, and Germany on a low nitrogen steel LNS for aircraft engines and aerospace bearings, France to develop a XD15N high nitrogen martensitic stainless steel for aerospace bearings, the United States developed a high-performance carburizing stainless steel CSS-42L, also successfully used for aerospace bearings.
(6) Ceramic Materials
Applied to the bearing of ceramic materials is the combination of Si3N4 and ZrO2 and its family of products. Impact resistance, toughness, density, friction coefficient, particularly high hardness, high temperature, strong corrosion resistance, moderate, moderate contact stress have a higher fatigue life, at high temperature, high-speed, corrosive media, The work of the bearing, the choice of ceramic materials in the strong friction state better. Type of ceramic bearing deep groove ball bearings, angular contact ball bearings and cylindrical roller bearings. Divided into two types from the fully ceramic materials: a steel inner and outer rings with ceramic rolling elements, known as a composite type; another ring and rolling element ceramics, known as the full ceramic . The full ceramic bearings in the application of the difficulty is caused by fragmentation and the shaft with different coefficients of expansion of the material.


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