High speed steel tools retain their hardness up to a temperature of

A. 250°C

B. 350°C

C. 500°C

D. 900°C

Answer: Option D

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Comments ( 1 )

  1. Mehul Rabari
    Mehul Rabari :
    9 months ago

    due to tungsten 18 4 cr 1 vandium 0.7 carbon

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