... 1≥1560≥91.0Qualified for machining of chilled cast iron, alloy cast iron, refractory steel and alloy steel ... . Also Qualified for the machining of common cast iron.YG6AK1014.7-15.1≥1580≥91. ... and semi-finish machining for the cast iron, non-ferrous metal, alloy and unalloyed materials ... 89Qualified for rough machining of cast iron, non-ferrous metal, nonmetal materials, drawing of steel, non-ferrous ...