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M2 Information & Composition

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This steel gets very sharp and has excellent edge holding. M2 has been used by Benchmade and Geber and is known for its edge holding.

Bohler M4 is shown for comparison.

M2 Heat Treating Information:
Preheat: Heat to 840-930°F, equalize. Second pre-heat stage at 1560-1650°F.

Austenitize: 1875-2200°F. Hold time at temperature: 1875°F - 45 minutes
1975°F - 30 minutes
2050°F - 20 minutes
2100°F - 15 minutes
2150°F - 10 minutes
2200°F - 5 minutes

For cutting tools use 2150-2200°F. For cold work applications use 1875-2125°F. Quench in air or positive pressure quench to below 125°F, or salt or interrupted oil quench to about 1000°F, then air cool to below 125°F. A fast quench rate from hardening temperature to below 1100°F is critical to achieve optimum heat treat response. A slower cooling rate below 1000°F may be used to minimize distortion.

Temper: Double temper at 1000°F minimum. Triple temper recommended when hardening from 2100°F or higher. 2 hours minimum each temper. Air cool to room temperature between tempers.

Cryogenic Treating: After the first temper may improve long term dimensional stability by transforming retained austenite. Any cryogenic treatment must be followed by a temper.

Heat Treating Services:
Peters Heat Treating

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Blade Steel Information & Composition

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