GC4330 and GC4340 are specially developed to overcome some difficulties encountered in processing steel parts. For example, when machining hard and wear-resistant steel parts, the flank of the insert will be greatly worn, especially in the case of high-speed, long-term continuous cutting. In addition, because of unstable jigs or long overhangs, machining in unstable conditions increases the risk of blade chipping. Another risk is that thermal fluctuations during processing-especially in wet-cutting environments-can cause cracks and sudden cracks in the blade. "

Among the many design properties of the GC4330 and GC4340 materials, it is worth mentioning the optimized Inveio coating. Inveio is a technological breakthrough in the orientation of alumina-coated single crystals, which gives blades higher wear resistance and longer life. In addition, the base material particle size control of these two materials is just right, which makes the blade performance more reliable and predictable.

43GC4330 is a medium hardness material, suitable for roughing to semi-finishing surface milling; while the stronger GC4340 is the better material for roughing square shoulder milling and slot milling. Both materials have now been extended to the CoroMill 245 and CoroMill 300 milling cutters mentioned above, as well as CoroMill 360 heavy-duty face milling cutters, CoroMill 419 high-feed milling cutters, and LPMH-PM plunge inserts.

In addition, CoroMill 365 high-security face milling cutters are now available in GC4330, while CoroMill 216 ball-nosed end mills and CoroMill 415 small diameter high-feed face milling cutters and CoroMill QD milling cutters are available in GC4340.

This greatly expands the existing range of applications for two grades: CoroMill 390 and CoroMill 490 square shoulder milling cutters, CoroMill 345 face milling cutters, CoroMill 210 high feed milling cutters, CoroMill 200 contour milling cutters and for grooving and cutting CoroMill 331 milling cutter.