What is bearing steel? What s going on with bearing steel

The material of the inner and outer rings and steel balls of the bearing is bearing steel (vacuum heat treatment).

Most of the bearings use SUJ2 in JIS steel, which is the domestic chromium steel (GCR15). The chemical composition of SUJ2 has been standardized as a bearing material in many countries around the world. For example:

It is the same kind of steel as AISL52100 (USA), DIN100CR6 (West Germany), BS535A99 (UK), etc. The use of this material effectively improves the torque performance of the bearing, reduces noise and prolongs the life. However, in humid or high temperature environments, martensitic stainless steel materials are used.

Chemical composition. Rolling bearing steel: GCR15, GB T18254-2000 "High Carbon Chromium Bearing Steel".

Uniform numerical code Grade chemical composition, %

b00150 gcr15 c si mn cr

Note: 1 The residual copper content (melting analysis) of the steel used for bearing steel pipes should not be greater than.

2 The oxygen content is determined on billets or steel.

3. The sulfur content (melting analysis) of the steel used for wire rod should not be greater than.

Austenitic stainless steel: 1Cr18Ni9, GB 1220-92 "Stainless Steel Bar".

Grade Chemical Composition, %

1cr18ni9 c si mn p s ni cr mo

Martensitic stainless steel: 9Cr18, GB 3086-82 "High Carbon Chromium Stainless Bearing Steel".

Grade Chemical Composition, %

9cr18 c si mn p s cr mo is not greater than.

Material properties. Materials: Inner and outer rings, steel balls, bearing steel, stainless steel.

Retainers Cold rolled steel strip (SPCC BQB402), stainless steel plate (1Cr18) Polyamide (nylon 66), etc. Stainless steel plate, polyamide, etc.

Dust cap Cold rolled steel strip (SPCC BQB402), stainless steel plate (1CR18) stainless steel plate.

Sealing rings: rubber (NBR, VITON) + skeleton (SPCC BQB402), PTFE (Teflon) NBR+SPCC BQB402, Teflon, etc.

Characteristic. The operating temperature is 120 or less and 300 is below.

The rated dynamic load is large and about 80 of the bearing steel

The rated static load is large and about 80 of the bearing steel

Frictional torque is low and high.

Usage: General use. For high precision, for high speed, corrosion resistance, high resistance.

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Bearing steel generally has a relatively high carbon content to enhance wear resistance, while stainless steel generally has a relatively high CR content of more than 12%, mainly to take advantage of its corrosion resistance. Compared with ordinary bearings, stainless steel bearings not only have obvious advantages in material, but also in terms of process and precision control, which are much stricter than ordinary bearings.

In the working process, the stainless steel bearing works stably, with low noise, corrosion resistance, and is widely used. AISI SUS440C stainless steel (domestic number: 9Cr18MO, 9Cr18) is used for bearing rings and rolling elements, and the cage and sealing ring are made of AISI 304 stainless steel (domestic number:

1cr18）。

Compared with ordinary bearing steel, stainless steel bearings have stronger rust and corrosion resistance, and can be used in an environment of -60 +300 with the right lubricant and dust cap. Stainless steel deep groove ball bearings are resistant to corrosion caused by moisture and several other media.

These single row deep groove ball bearings have the same deep groove groove groove as the standard deep groove ball bearings made of carbon chromium (rolling bearing) steel hosiery trousers, and the degree of coordination between the bearing raceway and the ball is extremely simple. Stainless steel bearings are widely used in food processing, medical equipment, and pharmaceutical machinery due to their high mechanical strength and large load capacity.

Bearing steel 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 bearing steel, surface hardening bearing steel, stainless bearing steel, and high-temperature bearing steel, with a total of 17 steel grades.

Bearing steel stuffing, also known as high-carbon chromium steel, has a carbon content of about 1% and a chromium content of WCR. 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 1%, from 1901 birth to more than 100 years, the main components have not changed, with the progress of science and technology, the research work continues, the quality of products continues to improve, accounting for more than 80% of the world's total bearing steel production. If there is no special description of the failure section buried in the bearing steel, it refers to GCR15.

Bearing steel 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.