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New ISCAR Grade IC907 for Stainless Steel
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Stainless steel, hardened steel and high-temp alloys can be machined with a new grade from ISCAR, designated IC907. It has a submicron substrate with a new multi-layer TiAlN PVD coating for optimal performance on these hard-to-cut materials. IC907 is composed of submicron powders with very high hardness and good fracture toughness. A thin PVD layer, produced at a relatively low temperature, serves to maintain the substrate's toughness. It provides compression stresses in the upper coating layer, improving the resistance to damage from high thermal and mechanical impacts.
Outstanding results can be obtained when machining austenitic stainless steel or high-temp alloys at high cutting speeds and high thermal loads. This is due to the low heat conductivity of the Al2O3 layer on the cutting edge, a result of a chemical reaction on the original coating of TiAlN. This thin layer serves to reduce friction and insulate the inserts from heat conduction, thereby providing a degree of protection against insert wear and plastic deformation. This new combination of an advanced, thin, PVD layer combined with a submicron substrate and modern ISCAR technology enables the manufacture of coated inserts with sharp cutting edges and positive rake angles.
When machining stainless steel - especially austenitic types - the machining is influenced by the material's strain-hardening, poor thermal conductivity, ductility, and tendency to have a built-up-edge. All of these problems are minimized by IC907 inserts with positive chipformers and nearly-sharp cutting edges.
The new IC907 inserts are normally used in continuous cuts with coolant in a wide range of machining conditions, including finishing, medium, and roughing. On interrupted cuts, normally dry conditions are preferred. For finishing applications on stainless steel, the inserts with SF/NF and SM chipformers and negative rakes are recommended. For medium machining, the TF or double-positive PP chipformers provide the best results. In roughing applications, the GN and new NR chipformers are a good choice. The strain-hardening phenomena, caused by the cutting forces, can be minimized with the more positive rake angles.
New grade IC907 improves performance on all ferritic, martensitic and austenitic stainless steel, with very good tool life, optimal chip formation and good surface quality.
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