Carbon bearing steel (GB 3203-82)
Carbon bearing steel, also known as bearing steel, is a type of steel alloy used in the production of bearing components that meets the China national standard GB 3203-82. It is characterized by excellent fatigue resistance, residual compressive notches, wear resistance, corrosion resistance, self-lubrication, good dimensional stability and a wide range of products. The two common alloys used in bearing steels are chromium steel, and non-chromium steel.
The general chemical composition of carbon bearing steel is 0.7-1.2% carbon, 0.3-0.5% making it a magnetic steel. The maximum content of sulfur and phosphorus should be lower than 0.03%. The contents of alloy elements such as chromium and nickel may be added if necessary, however; the content of each element should not exceed 0.5%.
The performance of carbon bearing steel is determined largely by its microstructure. This microstructure consists of a ferritic matrix with hardening particles of spheroids (hard particles), and other fine precipitate phases (carbon, nitrogen, etc.). With the introduction of chromium, fine nitrite particles are formed and are spread out uniformly and continuously over the matrix. This alloyed structure increases the strength and wear resistance of the steel at elevated temperatures and maintains the fine grain structure.
The use of carbon bearing steel can provide various kinds of advantages to the manufacturing of bearings. The main advantage is its good corrosion resistance. This is especially important in bearings that are exposed to harsh external environments. Other advantages include its strength, good thermal conductivity, wear resistance, self-lubrication, dimensional stability and good machinability.
In addition to bearing components, carbon bearing steel can also be used to make other components that require wear resistance, strength and good thermal conductivity. It is also used in various industries including automotive, metallurgy, electric power, construction/architecture and others that require powerful components.
Due to its excellent properties, carbon bearing steel is popularly used all over the world. In China, this steel is primarily used for bearings, gears, and automotive components. It is considered to be one of the most important materials used in the production of machinery and automobile parts. Therefore, it is highly preferred and specifically manufactured for the above-mentioned applications.
The main disadvantage associated with carbon bearing steel is its cost. It is one of the most expensive steels used in the manufacturing of bearing components, making it an expensive option for some producers. However, due to its many advantages, it is often preferred over other materials.
In conclusion, carbon bearing steel is a type of steel alloy that meets the China national standard GB 3203-82 and is used in the production of bearing components. It is characterized by excellent fatigue resistance, good dimensional stability, self-lubrication, wear resistance, and corrosion resistance. Despite its cost, it is still considered a popular choice due to its various advantages and is used in the production of bearings, gears, and automotive components.
