Abstract
1. The number of large carbides (over 9 μ), commensurate with the radius of curvature of the cutting edge, increases with the weight of the ingot, especially in the case of high-tungsten steel R18, which is the result of the solidification conditions. 2. Reducing the tungsten content and adding molybdenum induce refining of the carbides. In deformed tungsten-molybdenum steel R6M5 the number of large carbides is only half that in steel R18. Nevertheless, the number of large carbides remains substantial in steel R6M5 obtained from large ingots (550 kg and larger). 3. The degree of deformation, which has a large effect on the distribution of carbides (carbide heterogeneity), has almost no effect on the size of carbides. 4. For the production of high-speed steels rolled to small sections (diameter up to 20 mm) it is recommended that the ingot weigh 100–150 kg.
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