What is tungsten-molybdenum high speed steel?
Depending on the material composition, high speed steel (HSS) can be categorized into tungsten high speed steel, high molybdenum high speed steel, vanadium high speed steel and cobalt high speed steel, in addition to tungsten molybdenum high speed steel. Tungsten molybdenum high-speed steel (Tungsten molybdenum high-speed steel) and other high-speed steel, also by the tungsten (W), molybdenum (Mo), chromium (Cr), cobalt (Co), vanadium (V) and other elements of the composition of the product is composed of metal carbides (such as WC powder, MoC powder, etc.) and steel matrix composition of a material, but the most fundamental difference is that the raw material The ratios are different.
Tungsten and molybdenum high-speed steel in the tungsten content of 5 to 12%, molybdenum content of 2 to 6%; tungsten high-speed steel tungsten content of 9 to 18%; high molybdenum high-speed steel tungsten content of 0 to 2%, molybdenum content of 5 to 10%; vanadium high-speed steel vanadium content of 1 to 2% or 2.5 to 5%; cobalt high-speed steel cobalt content of 5 to 10%. Due to the different ratio of raw materials, the performance and usage of these high-speed steels are also different.
Compared to tungsten HSS, tungsten-molybdenum HSS has better strength, toughness, and thermoplasticity, primarily due to smaller, more uniformly distributed carbide grains, but is generally less dense because the relative atomic mass of molybdenum (96) is 50% smaller than that of tungsten (184). The main disadvantages of tungsten-molybdenum HSS are a high tendency to decarburize during heat treatment, a tendency to oxidize, and a narrow range of quenching temperatures.
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