Bearing steel is used in the manufacture of ball bearing, roller bearing ring and steel. Bearing to work under great pressure and friction, so the requirement bearing steel has high and even hardness and wear resistance, and high elastic limit. On the uniformity of the chemical composition of bearing steel, the content and distribution of non-metallic inclusions are very demanding, the distribution of the carbide, etc, are all steel production in one of the most demanding steel grade. In 1976, the international organization for standardization ISO incorporate the bearing steel grade of some common international standards, the bearing steel is divided into: the hardening type bearing steel, surface hardening type bearing steel, high temperature stainless bearing steel, bearing steel, a total of 17 steel grade four class.
Mention of bearing steel, iron and steel enterprises have to mention Sweden. The Swedish iron and steel enterprises for special steel products is 70%. To improve the degree of specialization, and avoid unnecessary for many manufacturers to produce the same product competition, the Swedish iron and steel production enterprises, after many times almost formed a company specific production structure adjustment after a steel product layout, such as stainless steel, tool steel, high-speed steel and bearing steel has ranked the top in the world. Of Sweden’s walker Ovako company is one of the main bearing steel production enterprises.