... 3) Higher cutting efficiency 4) Longer tool life PCBN Inserts for cast iron and hardened steelGrade: FBS7000, FBS7500, FBS9000, FBS9500, FBS9600 Certificates: ISO14001 ... 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, and ...