Bearing Steel

 

Bearing steel is also known as high-carbon chromium steel, the carbon content of Wc is about 1%, the chromium content of Wcr is 0.5%-1.65%. Bearing steel is divided into six categories: high-carbon chromium bearing steel, non-chromium bearing steel, carburized 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 1.5%, from 1901 to the birth of more than 100 years, the main composition has basically not changed, with the progress of science and technology, research work is continuing, product quality continues to improve, It accounts for more than 80% of the world's total bearing steel production. So that if there is no special description of bearing steel, it refers to GCr15.

 

Bearing steel is the steel used to make balls, rollers and bearing rings. Bearing steel has a high and uniform hardness and wear resistance, as well as a high elastic limit. The requirements for the uniformity of the chemical composition of bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict, and it is one of the most stringent steel grades in all steel production.

1. China GB's high carbon chromium bearing steel such as GCr6 is similar to German DIN standard W-Nr.100C2.

2. China GB's GCr9 is similar to German DIN standard W-Nr.105Cr4.
3. China GB's GCr15 is similar to German DIN standard W-Nr.100Cr6.
4. China GB GCr15SiMn is similar to German DIN standard W-Nr.100CrMn6.
5. China GB G20CrMo is similar to German DIN standard W-Nr.17321A53441.
6. China GB G20CrNiMo is similar to German DIN standard W-Nr.1652320NCD2.
7. China GB G10CrNi3Mo is similar to German DIN standard W-Nr.32H13A53493.
8. China GB stainless bearing steel such as 119Cr18SUS440C is similar to the Japanese JIS standard SUS440CSKF577STORA-577A756440CSKF bearing steel.

Bearing steel is divided into high-carbon chromium bearing steel, carburized bearing steel, stainless bearing steel and so on. Carburized bearing steel hardenability and toughness is better than carbon bearing steel, not easy to overheat, and quenching deformation is small, good wear resistance. Stainless bearing steel has high corrosion resistance and acid overcorrosion resistance in some media, which is 2 times higher than 18-8 stainless steel.

Bearing steel produced in China has high carbon chromium bearing steel, carburized bearing steel, stainless bearing steel and so on. The steel number of high-carbon chromium bearing steel is GCr6, GCr9, GCr15, GCr15SiMn, etc., and the steel number of carburized bearing steel is G20CrMo, G20CrNiMo, G10CrNi3Mo, etc.

Advantages of bearing steel

Professional bearing Steel supplier --Sichuan Liaofu Special Steel Company.,Ltd

High and uniform hardness and wear resistance:

bearing steel can maintain a high and uniform hardness, ‌ to ensure its excellent wear resistance, ‌ is essential for extending the service life of the bearing. ‌.

 

High elastic limit

 

bearing steel has a high elastic limit, ‌ can withstand heavy pressure or impact to maintain shape stability, ‌ reduce mechanical failure caused by deformation. ‌

 

Good hardenability

 

bearing steel has good hardenability, ‌ can achieve uniform hardening within a larger cross-section size, ‌ improve the overall performance of the bearing. ‌

Extremely strict control of sulfur and phosphorus

By strictly controlling the content of sulfur and phosphorus, ‌ bearing steel can avoid hot brittleness and cold brittleness, ‌ to ensure that the material can maintain stable performance in a variety of working environments. ‌

GCr15 bearing steel

GCr15 is a high carbon chromium bearing steel, widely used in bearings, linear bearings and transmission gear and other fields. The steel has excellent wear properties and hardness, and is suitable for high-speed, high load and high temperature working environments. At the same time, GCr15 also has certain hardenability, rigidity and fatigue resistance.

G20CrNiMo bearing steel

G20CrNiMo is a medium carbon chromium-nickel bearing steel characterized by high strength, toughness and fatigue resistance. Suitable for bearing and cycloidal gear for large and heavy loads.

GCr9SiMn bearing steel

GCr9SiMn is a kind of manganese-silicon bearing steel, which has good shock absorption performance, and is widely used in bearings and linear bearings with high-speed rotation in a short time. The steel has high strength, stiffness and fatigue resistance, and is suitable for high-speed, high-load and medium-high temperature environment.

 GCr18Mo high temperature bearing steel

GCr18Mo is a high temperature bearing steel, suitable for high temperature, high speed and high heat resistance requirements of the working environment. The steel has excellent oxidation resistance and wear resistance, and is less affected by stress relaxation at high temperatures.

G20Cr2Ni4A bearing steel

G20Cr2Ni4A is a medium carbon steel suitable for high speed and light load, with high hardness and strength, relatively easy to process and heat treatment. Suitable for small bearing, large gear and low load plain bearing with high production type and precision requirements.

GCr15SiMn bearing steel

GCr15SiMn is a kind of high hardness, high wear resistance of chromium silicon manganese bearing steel, with good fatigue resistance, mainly used in heavy and high-speed bearings and cycloidal gear, drive shaft and other parts.

GCr18MoS2 low noise bearing steel

GCr18MoS2 is a low noise bearing steel with good corrosion resistance, high strength and high hardness, suitable for bearing parts in high-speed and high-load working environments.

GCr15VA low temperature bearing steel

GCr15VA is a kind of Cr-Mo bearing steel with good low temperature toughness and wear resistance, which is suitable for special bearings and transmission gear parts in low temperature environment.

Bearing steel process detailed flow

1

 

Hot metal preparation

The production of bearing steel usually adopts two methods of electric furnace and converter smelting, no matter which method is used, hot metal must be prepared according to the requirements, including hot metal temperature, carbon content, sulfur content, inclusions, etc., and need to be tested and analyzed before the oven to ensure that the quality of hot metal meets the requirements.

2

 

Preparation of additional alloys

Usually added additional alloys including silicon, manganese, chromium, nickel, molybdenum, potassium, calcium, etc., need to calculate the proportion of alloy ingredients in advance, and then add to the charge according to the requirements.

3

 

smelting

Adding the charge---Melting--Tempering

Adding the charge: Gradually pour the prepared hot metal and additional alloy into the furnace, pay attention to control the adding speed, avoid the charge temperature is too high or low, while adding too much will cause the charge splash or overflow. The charge added to the furnace is melted to reach the temperature and state of the chemical reaction to ensure the quality of the steel. By adjusting the content of carbon and sulfur in the charge, adding lime, titanium nitride, acicular boron nitride and other substances, adjusting the grain, phase structure and distribution in the steel can improve the comprehensive performance of the steel.

4

 

Casting and forging

Casting: The qualified molten steel is screened, purified, poured into the mold, cooled and solidified into the desired shape of the billet. Forging: The billet is heated to the microstructure of the interval, and then through forging processing to change the shape, size and mechanical properties of the billet, better than casting steel performance, often used in the production of large bearings.

5

 

Heat Treatment

Quenching: The steel parts are heated to the corresponding quenching temperature, and the steel parts are cooled rapidly after a certain period of time, so that the steel parts obtain high hardness and certain brittleness. Tempering: After quenching, the steel parts are heated to a lower temperature, and the steel parts are cooled slowly after uniform heating for a certain time, so that the steel parts obtain a certain toughness. If necessary, it can be quenched and tempered several times to obtain the desired performance.

 

 

 

 

 

 

 

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