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My grandfather told me to quench in old motor oil instead of water for tool steel.
After 4 years of fighting with cracked blades from water quenching, I tried his advice on an old farrier's rasp and it came out harder with zero cracks, and now I only use oil for anything over 0.5 percent carbon, has anyone else switched and noticed a big difference?
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wren_jackson15d ago
Quenching in oil still risks cracking on high carbon steel.
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elizabeththomas14d ago
Oil can still crack high carbon steel depending on the specific alloy and temperature.
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