Abstract
Previously, one of the authors studied on the effects of each elements on the low tungsten-molybden-vanadium high speed steel (Sadao Koshiba, Jnl. Japan Inst. of Metals, 16, 1652, No. 9, 511)
In this experiment, the authors studied the changes in their hardness and microstructures bronght about by the heat treatments with the varions kinds of the moderately low tungsten-molybden-vanadium high speed steel containing C 0.7-1.4%, Cr 3.5-4.5%, W 4.0-8.0%, Mo 2.0-4.0%, V 1.5-3.5% from previons results, and also tested their durability by putting them in actual service, and then made a comparison with the low-tungsten high speed steel and molybdenum high speed steel.
From thess experiments, the moderate compositions of low-W-Mo-V high speed steel were ascertained as follows: - C 0.8-1.0%, Cr 4.0-4.5%, W 4.0-5.0%, Mo 3.0-4.0%, V 2.0-2.5%, and C 1.0-1.2%, Cr 4.0-4.5%, W 5.0-6.0%, Mo 2.5-3.5%, V 2.5-3.0%.
