The main alloying elements high speed steel in order of increasing proportion are

Answer: Option A

: High-speed steel (HSS) is an alloy known for its high hardness and resistance to abrasion, making it ideal for cutting tools. The main alloying elements are added in specific proportions to achieve these properties.

Vanadium is present in the smallest proportion among the three listed elements, followed by chromium, and then tungsten in the highest proportion.

Vanadium improves the wear resistance and hardness.

Chromium enhances the toughness and corrosion resistance.

Tungsten increases the hardness, hot hardness, and wear resistance of the steel.