... tool life PCBN Inserts for cast iron and hardened steelGrade: FBS7000, ... alloy cast iron, high nickel chromium, high chrome iron and other materials. 3) Suit for rough machining and semi-finishing of gray cast iron and nodular cast iron ... alloy cast iron, high nickel chromium, high chrome iron and other materials. 3) Suit for semi-finishing and finish machining of gray cast iron, nodular cast iron ...