1. Tungsten Carbide inserts 2. Grade: YG3, YG6, YG8, YT5, YT14, ... rough turning of steel and cast steel with a big feed rate at a medium and low speed under unfavorable ... the heavy duty turning of steel and cast steel with a big feed rate under unfavorable working conditionP40YM40 YC4512. ... duty turning of steel and cast steel with a big steel rate and also for face milling Tungsten Carbide Inserts