High-carbon high-chromium stainless bearing steel and preparation method thereof

Abstract

The invention relates to a high-carbon high-chromium stainless bearing steel and a preparation method thereof. The high-carbon high-chromium stainless bearing steel comprises the following components in percentage by weight: 0.9-0.95% of carbon, 0.80-0.85% of silicon, 0.3-0.35% of manganese, less than 0.025% of sulfur, less than 0.02% of phosphorus, 0.15-0.3% of molybdenum, 3.5-4.0% of chromium, 0.01-0.02% of nitrogen, 0.1-0.2% of nickel, 0.02-0.03% of niobium, 0.02-0.03% of vanadium and the balance of iron. The technical scheme provided by the invention is beneficial to deoxidation effect, enhances the cleanliness of the bearing steel, and lowers the oxygen content in the bearing steel.

Description

technical field [0001] The invention belongs to the field of alloy materials, and refers to a bearing steel, in particular to a high-carbon chromium stainless bearing steel and a preparation method thereof. Background technique [0002] Bearing steel is divided into four categories: high-carbon chromium bearing steel, carburized bearing steel, high-carbon chromium stainless steel and high-temperature bearing steel. [0003] In the bearing parts, the rotating parts are generally used in a relatively mild corrosive environment. According to the requirements of their use, sometimes anti-rust agents and lubricants cannot be used. Therefore, the structure of the bearing steel in use should be that fine carbide particles are evenly distributed on the tempered martensite matrix. [0004] The most common form of bearing damage is contact fatigue damage, which is mainly due to the occurrence and development of fatigue cracks due to the generation of local stress. The research shows...

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Problems solved by technology

At present, foreign technology has been able to achieve the oxygen content in bearing steel below 10PPM, and there are also a few domestic manufacturers that can achieve this requirement. There are also theories that claim that the goal of bearing steel is oxygen-free or the oxygen content is below 5PPM to achieve true cleanliness. However, when the oxygen content is lower than 7PPM, the contact fatigue performance does not increase due to the reduction of oxygen content, and the inclusion of D-type substances in the bearing steel becomes the main factor affecting the occurrence and development of fatigue cracks in the bearing steel