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Comparison of Advantages and Disadvantages of Bearing Steel and Carbon Steel

2016-09-28 15:28:07

According to the investigation and analysis of the research results show that bearing steel and carbon steel shaft although the shape is not very different, but in essence their respective advantages and disadvantages are very obvious. The following is a specific survey and analysis results:



First, in terms of service life. Their use of life time is very different, bearing steel, long service life, many garbage bearings are carbon steel bearings, mainly hardness and wear resistance are not as bearing steel bearings.

Second, in terms of wear resistance. Low-carbon steel surface hardening only in the surface carburizing, and not all quenching. Many low-grade carbon steel bearings on the market is not quenching hard, very poor wear resistance.

Third, in the process and the use of effects. Bearing the use of good or bad effects and the use of the environment, not to say that carbon steel bearing is not good, depending on which machinery to use, because some do not need high-grade, with carbon steel bearings on the right week. Of course, better but the cost of steel is much higher, the standard bearing steel is Gcr15.

Fourth, the bearing materials and performance. For example, the bearing rings and the rolling elements are subjected to high contact pressure repeatedly, and rolling contact is accompanied by sliding, while maintaining high-precision rotation.Therefore, the bearing rings, rolling and cage materials and performance to meet the following requirements: high elastic limit; high rolling fatigue strength; have high hardness; good wear resistance; toughness of the impact load; Dimensional stability. In addition, but also good processing. Proven, bearing steel has the above required performance, but the carbon steel bearings can not be guaranteed. Fifth, not to say that the advantages of carbon steel bearings have no bearing steel is good nowhere available, and this depends on where used. Carbon steel bearing noise, particularly short life expectancy, the pressure is particularly small, but can be used in the hardness, speed limits are relatively small place. Surface strengthening technology can form a variety of classification methods from different angles, according to the surface layer strengthening technology of physical and chemical process classification, can be divided into five categories: surface deformation strengthening, surface heat treatment strengthening, chemical heat treatment strengthening, surface metallurgy strengthening, surface film strengthen.

1, the bearing surface deformation strengthening

By mechanical means to the metal surface layer of plastic deformation, resulting in high hardness and high strength of the hardened layer, this method is called surface hardening surface strengthening, also known as work hardening. Including shot blasting, sandblasting, cold extrusion, rolling, cold grinding and impact, explosion and impact strengthening. Most of its methods have been applied in the bearing industry: the impact of the surface of the rolling body is the application of such methods, precision compaction has become a new processing and reinforcement methods.

2, bearing surface heat treatment to strengthen
The use of solid-state phase change, by rapid heating of the surface layer of the quenching treatment known as the surface heat treatment, commonly known as surface hardening. Including flame heating quenching, high (medium) frequency induction heating quenching, laser heating or electron beam heating quenching. These methods are characterized by: the surface of the local heating quenching, the workpiece deformation is small; heating speed, high production efficiency; heating time is short, the surface oxidation decarburization is very minor. The method is particularly effective for improving the wear resistance and fatigue strength of large and extra large bearing parts subjected to a certain impact load.
3, bearing chemical heat treatment to strengthen
The use of an element of solid-state diffusion infiltration, to change the chemical composition of the metal surface layer in order to achieve the surface strengthening method known as the chemical heat treatment strengthening, also known as the diffusion heat treatment. Carburizing bearing steel parts of the processing technology and needle roller bearing nitriding surface treatment are enhanced this type of strengthening method.
4, surface metallurgy to strengthen the bearing
Surface remelting and solidification of the surface layer metal to obtain the desired composition or texture is called surface metallurgy strengthening. Including surface self-dissolving alloy or composite powder coating, surface melting and crystallization or amorphous treatment, surface alloying and other methods. Rolling bearing industry in the micro-bearing surface of the work done to strengthen the study of laser heating, the effect is good. In this case,
5, the bearing surface film strengthening
Application of physical or chemical methods, the metal surface coating in the matrix material properties of different reinforced film, known as the surface film strengthening. It includes electroplating, electroless plating (chrome plating, nickel plating, copper plating, silver plating, etc.) as well as composite plating, brush plating or conversion treatment. It also includes the rapid development of high technology in recent years: CVD, PVD, P-CVD Vapor deposition thin film strengthening method and ion implantation surface strengthening technology (also known as atomic metallurgy technology) and so on. They are common features are in the work surface to form a specific performance of the film, to strengthen the surface of the wear resistance, fatigue resistance, corrosion resistance and self-lubricating properties. For example, ion implantation technology to strengthen the bearing surface, bearing surface can wear, corrosion resistance, and resistance to contact fatigue performance have been significantly improved, so that the bearing life will be multiplied.