CPM-154 heat treat: austenitize, quench & temper chart
CPM-154 is a stainless knife steel. Here is the full heat-treat schedule — austenitizing temperature, quench, cryo and a tempering-temperature chart mapping each temper to final HRC — with every number cited to the source, not guessed.
The CPM-154 heat-treat schedule
Austenitize: 1950–2025°F (1950°F recommended), hold 30 min once to temperature. A controlled oven or kiln beats forge colour for hitting this window repeatably.
Quench: Plate quench. Never use Water, Brine, Parks 50, Duratherm 48, Parks AAA, Canola oil. Plate quench between aluminum plates. PM-process refined version of 154CM.
Cryo (recommended): LN₂ 30–60 min. Stainless with significant retained austenite at 60+ HRC. Straight from the quench into cryo, then temper.
Temper: 2 passes of 2 h at 450°F for the recommended edge (~60 HRC). Temper twice for 2 hours. Do NOT exceed 500°F — tempered martensite embrittlement zone.
CPM-154 tempering-temperature chart
Two-hour temper (×2), HRC after cryo where used. Pick the tempering temperature for the hardness your knife needs:
| Tempering temperature | Resulting hardness |
|---|---|
| 300°F (149°C) | 63–64 HRC |
| 400°F (204°C) | 60–61 HRC |
| 450°F (232°C) | 60 HRC |
Target hardness for CPM-154 by knife type
| Use | Recommended HRC |
|---|---|
| Kitchen | 61–62 HRC |
| EDC | 60–61 HRC |
| Hunter | 60–61 HRC |
| Hard-use chopper | 60 HRC |
Most common mistake
500°F is the tempered martensite embrittlement zone — properties drop sharply. Use the Latrobe datasheet rather than Crucible's for 154CM/CPM-154.
FAQ
What temperature do you austenitize CPM-154?
1950–2025°F, with 1950°F recommended, held 30 min once the steel is fully up to temperature.
What is the best quench for CPM-154?
Plate quench. Never Water, Brine, Parks 50, Duratherm 48, Parks AAA, Canola oil. Plate quench between aluminum plates. PM-process refined version of 154CM.
What HRC does CPM-154 reach?
60–64 HRC across the usable tempering range; about 61–62 HRC for a kitchen knife. Temper at 450°F for ~60 HRC.
How do you temper CPM-154?
2 passes of 2 h at 450°F for the recommended edge. See the chart above to pick a different tempering temperature for a harder or tougher blade.
Can you forge CPM-154?
CPM-154 is best heat-treated in a controlled oven or kiln rather than forged by colour — its austenitizing window and quench are too tight to hit reliably by eye.
What you need to heat-treat CPM-154
Repeatable hardness comes from controlling temperature and quench speed — eyeballing colour is how blades end up soft or cracked.
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- A heat-treat oven or kiln holds the 1950°F austenitizing temperature — the single biggest factor in repeatable hardness.
- Air-hardening steel plate-quenches between aluminium quench plates — no oil bath needed.
- Verify the result with a Rockwell hardness tester or hardness files — don't trust the schedule blind.
- Wrap in stainless tool-wrap foil to stop decarb and scale at high austenitizing temperatures.
Sources
Heat-treat schedules are the cited published values for CPM-154; every furnace, quench and blade geometry varies, so verify against your own hardness testing. Getting steel to non-magnetic is not the same as reaching austenitizing temperature — use a controlled oven or kiln for repeatable results.