Find the chemical composition table of bearing steel, what are the components of bearing steel?

Bearing steel is the steel used to make balls, rollers, and bearing rings. Bearings are subjected to great pressure and friction during operation, so bearing steels are required to have high and uniform hardness and wear resistance, as well as high elastic limits. It is one of the most stringent steel grades in all steel production, with strict requirements for the uniformity of chemical composition, the content and distribution of non-metallic inclusions, and the distribution of carbides.

In 1976, the International Organization for Standardization (ISO) incorporated some general bearing steel grades into international standards, and divided the bearing steel into four categories: fully hardened bearing steel, surface hardening bearing steel, stainless bearing steel, and high-temperature bearing steel, with a total of 17 steel grades. Some countries have added a category of bearing steels or alloys for special purposes.

The classification method of bearing steel that has been included in the standard in China is similar to ISO, corresponding to four categories: high-carbon chromium bearing steel, carburized bearing steel, stainless corrosion-resistant bearing steel, and high-temperature bearing steel. In the past 50 years, China has also made great progress in bearing steel grades and bearing materials, such as chrome-free bearing steel, medium carbon bearing steel, special-purpose bearing steel and alloys, cermets, etc. High carbon chromium bearing steel GCR15 is the world's largest production of bearing steel, carbon WC is about 1%, chromium content WCR is about, from 1901 birth to more than 100 years, the main components have not changed, with the progress of science and technology, research work continues, product quality continues to improve, accounting for more than 80% of the world's total bearing steel production.

So much so that now what we call bearing steel, if there is no special description, it refers to GCR15.

Bearing steel is one of the most widely used in the steel industry, and it is also one of the most demanding steel grades in the steel production process. The use of bearing steel can effectively improve the torsional performance of the bearing, reduce noise and delay the service life. Because of its superior performance, it is strictly required that its composition must have uniform hardness, wear resistance and high elastic limit, but how much carbon and how much chromium should be contained in its composition is a great science.

Every metallurgical technician should understand the composition of different types of bearing steel, in order to smelt high-quality bearing steel more smoothly.

Bearing steel, as one of the most demanding steel grades in all steel production, has a carbon content of about 1% C and a chromium content of Cr. Internationally, according to international standards, bearing steel is divided into six categories: high-carbon chromium bearing steel, chromium-free bearing steel, carburizing bearing steel, stainless bearing steel, medium and high temperature bearing steel and anti-magnetic bearing steel.

Among them, the output of high-carbon chromium bearing steel GCR15 has accounted for more than 80% of the world's total bearing steel production. The high-carbon chromium bearing steel GCR15 is the world's largest production of bearing steel, with a carbon WC content of about 1% and a chromium content of about 1%. For more than 100 years since its birth in 1901, the main composition of high-carbon chromium bearing steel GCR15 has remained basically unchanged.

So much so that if there is no special description of bearing steel, it refers to GCR15.

The general bearing steel is mainly high-carbon chromium bearing steel, that is, per-eutectic steel with a carbon content of about 1%, adding chromium around the left, and containing a small amount of manganese and silicon elements. Chromium can improve heat treatment performance, improve hardenability, microstructure uniformity, tempering stability, and can improve the rust resistance and grinding performance of steel. However, when the chromium content is exceeded, the residual austenite in the steel will be increased after quenching, the hardness and dimensional stability will be reduced, the inhomogeneity of carbides will be increased, and the impact toughness and fatigue strength of the steel will be reduced.

For this reason, the chromium content in high-carbon chromium bearing steels is generally controlled below 1,65%. Only by strictly controlling the chemical composition in the bearing steel can the structure and hardness that meet the performance of the bearing be obtained through the heat treatment process.

In the face of such strict composition requirements of bearing steel, the quality control in the metallurgical process is also extremely strict, and the following points should be noted:

1) High dimensional accuracy.

2) Particularly strict purity.

3) Strict low-magnification and microscopic (high-magnification) tissues.

4) Particularly strict surface defects and internal defects.

5) Strict carbide inhomogeneity.

6) Strict surface decarburization layer depth.

With the development of the economy, urban infrastructure projects across China are in full swing, and the basic machinery casting industry such as precision bearings is also developing rapidly, resulting in more and more demand for bearings, and the future bearing steel market prospects are bright. The major steel mills should fully understand the composition and physical properties of the major categories of bearing steel, strictly control the content of the components in the smelting process, and pay attention to the strict control of metallurgical quality, so that the smelted bearing steel meets international standards and can meet the rapidly growing market demand.

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Different types of bearing steel elements are different.

Bearing steel, also known as high-carbon chromium steel, has a carbon content of about 1% C and a chromium content of Cr. Bearing steel is divided into six categories: high carbon chromium bearing steel, chromium-free bearing steel, carburizing bearing steel, stainless bearing steel, medium and high temperature bearing steel and anti-magnetic bearing steel.

High carbon chromium bearing steel GCR15 is the world's largest production of bearing steel, carbon WC is about 1%, chromium content WCR is about, from 1901 birth to more than 100 years, the main components have not changed, with the progress of science and technology, research work continues, product quality continues to improve, accounting for more than 80% of the world's total bearing steel production. So much so that if there is no special description of bearing steel, it refers to GCR15.

China has produced high-carbon chromium stainless bearing steel, the main steel grade is 9cr18; Carburized bearing steel, the main steel grade is G20CRMO; Chromium bearing steel, the main steel grade is GCR15.

Bearing Lee is the steel used to make balls, rollers and bearing rings. Bearing steels have high and uniform hardness and wear resistance, as well as high elastic limits. It is one of the most stringent steel grades in all steel production, with strict requirements for the uniformity of chemical composition, the content and distribution of non-metallic inclusions, and the distribution of carbides.

In 1976, the International Organization for Standardization (ISO) incorporated some general bearing steel grades into international standards, and divided the bearing steel into four categories: fully hardened potato bearing steel, surface hardening bearing steel, stainless bearing steel, and high-temperature bearing steel, with a total of 17 steel grades.