Ovako 157 is a high cleanliness case hardening steel used for bearing and transmission components. There are three different modifications of the grade.
157C - Bearing quality (BQ) variant with low sulphur content
157D - Bearing quality (BQ) variant with low sulphur content
157G - Regulated sulphur content for improved and consistent machinability
(Bearing Quality) is a bearing quality clean steel optimized for fatigue strength by a strict control of steel cleanliness. BQ-steel is also ideal for new design solutions in a wide array of demanding applications outside the bearing industry that require longer performance and higher loads. The BQ-steel offer is the result of the Ovako clean steel program. Purity of production means that the material has significantly smaller inclusions compared to conventional steel and, as a result, the fatigue strength of the steel is increased dramatically. Use of the material allows components to be manufactured in smaller sizes. The BQ-steel has for decades been the problem-solver.
ASTM 4320, ASTM 4320H, ASTM 4320RH