Technological and cutting properties of high-vanadium high-speed steels

Abstract

1. Economically alloyed high-speed steels with a high vanadium content (8%) and low tungsten content (2.5%) are superior to steel R18 in heat resistance (by 10–15°C) and in cutting properties. 2. The wear resistance of blades of high-vanadium steels R2M3F8 and R2M4F8K5 in gear cutting at rates over 60 rev/min and feeds of 0.25–0.75 mm/rev is 1.5–3.0 times higher than that of steel R18. 3. High-speed steels with a high vanadium content (8%) and low tungsten content (2.0–2.5%) can be quenched to a smaller grain size (grade 11). 4. An increase of the chromium content from 4% to 6% in steel R2M3F8 is inadvisable, since it does not improve the durability of cutting tools. 5. High-vanadium steels can be recommended for tools with minimal grinding or no grinding.