Main role of rust-proof steel ball and its hardness standard

- Sep 15, 2018 -

Steel balls are important basic components, especially precision industrial steel balls play a huge role in the development of the national economy. Under special conditions, steel balls with special requirements are often required to perform the functions required in different environments. For example, anti-rust steel balls, which have been widely used in various fields of the national economy, including 9Cr18, 3Cr13 stainless steel, copper, aluminum, titanium alloy steel and agate, glass, ceramic balls and so on.


The anti-rust steel ball is the most important part of the bearing and the most used rolling element in the bearing industry. Its quality directly affects the bearing quality. The post-process of anti-rust steel ball production, namely automatic cleaning of steel balls, automatic appearance inspection, automatic rust prevention, counting and packaging, are the key factors affecting the quality of steel balls.


According to different materials, rust-proof steel balls can be divided into bearing steel balls, stainless steel balls, plastic balls, copper balls, ceramic balls, etc. According to the hardness, they can be divided into high-hardness balls and soft balls. They are able to have rust preventive ability because of the addition of anti-rust oil to their surface.


The hardness of the anti-rust steel ball is generally HRC58-66 according to the requirements of relevant standards; the hardness will vary depending on the size. More than -30, the hardness is generally HRC61-66; more than 30-50mm, the hardness range is about HRC58-64. In the industry testing methods, generally the mechanical equipment hardness, core hardness and surface hardness. The bearing steel ball is used as a relatively hard sphere and is used on high precision equipment. Therefore, the core hardness and surface hardness are similar.