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What is the advantage of adding alloy elements in a steel in order to increase the tempering temperature while keeping hardness and ductility the same as before? If I wasn't clear enough, I want to know what difference makes a higher tempering temperature, if hardness and ductility will be the same.

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Temperature resistance is especially useful for machine tools eg drills, lathe tools ect etc.

Mechanised cutting generates a lot of heat and equally cutting tools need to be tempered fairly hard for obvious reasons and it is very easy for something like a drill to get well into the normal tempering range of carbon steel, thus losing its original temper.

High speed steels for example are widely used for general purpose drill bits etc as they allow higher speeds and/or feed rates to be used while remaining in an acceptable temperature range.

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