Bearing Steel Bar

Bearing steel is a steel used to manufacture balls, rollers, and bearing rings. Bearing steel has high and uniform hardness, wear resistance, and high elastic limit. Strict requirements are placed on the uniformity of chemical composition, content and distribution of non-metallic inclusions, and distribution of carbides in bearing steel, making it one of the most stringent steel grades in all steel production. In 1976, the International Organization for Standardization (ISO) incorporated some commonly used bearing steel grades into international standards, dividing bearing steel into four categories: fully quenched bearing steel, surface hardening bearing steel, stainless bearing steel, high-temperature bearing steel, and a total of 17 steel grades.

Bearing steel, also known as high carbon chromium steel, has a carbon content of about 1% and a chromium content of 0.5% -1.65%. Bearing steel is divided into six categories: high carbon chromium bearing steel, chromium free 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 most produced bearing steel in the world, with a carbon content of about 1% and a chromium content of about 1.5%. Since its inception in 1901, its main composition has remained largely unchanged for over 100 years. With the advancement of science and technology, research work continues, and product quality continues to improve, accounting for more than 80% of the world's total bearing steel production. So if there is no special specification for bearing steel, it refers to GCr15.
China has produced high carbon chromium stainless bearing steel, with the main steel grades being 9Cr18; Carburized bearing steel, with the main steel grades being G20CrMo; Chromium bearing steel, with the main steel grades being GCr15.