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440C Information & Composition

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Information Pages:

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The highest carbon stainless steel of the 440 series. It is a very good blade steel. I think the reason it is not more popular is because newer steels have overshadowed it.

440B and CTS-40CP are shown in the table above for comparison purposes.

440C Data Sheets:

Bohler N685 (440B) Data Sheet
Bohler N695 (440C) Data Sheet
Carpenter 440B Data Sheet
Carpenter 440C Data Sheet
Carpenter CTS-40CP
Crucible 440C Data Sheet
Latrobe 440C Data Sheet

440C Heat Treating Information:
Preheat: Heat to 1400° and equalize.

Austenitize: Ramp to 1850°-1950°F and hold at temperature for 30 minutes. Oil, plate or air quench to below 150°F.

Cryogenic Treating: Cyro may be performed after quenching to 125 °F to reduce retained austenite. After cyro allow blade to warm to room temperature.

Temper: Temper immediately after quenching or cyro. Hold at temperature for two hours minimum and allow to cool to room temperature. Use the table below to select the rockwell hardness.

440C Heat Treating Services:
Pacific Metallurgical
Paul Bos Heat Treating
Peters Heat Treating

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Blade Steel Information & Composition

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