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The finish of the finished grade WQM15 contains high speed cutting and high metal removal rates for steel and cast iron. In WQM25, the coating is supplemented by bismuth. It is especially suitable for high-speed milling of stainless steel, producing a moderate amount of chips, probably due to the use of coolant, which has good thermal shock resistance. The third grade in the series is WQM35, which was developed for the processing of difficult-to-machine materials (titanium and superalloys). Although no further information is available, according to the company's research progress, it can be understood that WQM35 is based on Multi-layer fine-grain CVD coating combined with PVD coated cemented carbide." The fourth grade of Quartee is the WQM40. This is a new grade developed for milling titanium and heat resistant alloys under harsh processing conditions with coolant.
According to reports, Walter Germany has developed the Quartee indexable milling insert for cutting tools. There are three geometries: D56, F56 and G56, which are suitable for difficult materials, soft cutting and smooth machining, respectively. The main technical innovation is in the field of coatings.