Tool steel

Steel which, by special treatment or peculiar composition with alloying metals, is adapted to retain a cutting edge at comparatively high temperatures so as to permit of high cutting speeds. Messrs. Taylor and White give the following as the best composition for such steel. Vanadium, 0.29 per cent; tungsten, 18.19 per cent; chromium, 5.47 per cent; carbon, 0.674 per cent; manganese, 0.11 per cent; and silicon, 0.043 per cent.