AEB-L heat treat: austenitize, quench & temper chart
AEB-L 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 AEB-L heat-treat schedule
Austenitize: 1925–1975°F (1925°F recommended), hold 15 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 or steel plates. Oil quench is not appropriate for stainless. Foil-wrap the blade to prevent decarb.
Cryo (recommended): LN₂ 30–60 min preferred; household freezer 30–60 min acceptable; or skip for slightly lower peak hardness. Out of quench, straight into cryo. Straight from the quench into cryo, then temper.
Temper: 2 passes of 1 h at 350°F for the recommended edge (~62–63 HRC). Temper twice for 1 hour each at 350°F unless intentionally biasing toughness or hardness. Acceptable range 300–600°F.
AEB-L 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 |
| 350°F (177°C) | 62–63 HRC |
| 400°F (204°C) | 60–61 HRC |
| 450°F (232°C) | 59–60 HRC |
Target hardness for AEB-L by knife type
| Use | Recommended HRC |
|---|---|
| Kitchen | 61–63 HRC |
| EDC | 60–61 HRC |
| Hunter | 60–61 HRC |
| Hard-use chopper | 59–60 HRC |
Most common mistake
Do not exceed 2000°F austenitize — toughness drops. Foil-wrap to prevent decarb. Cryo delay reduces effect significantly — freezer transfers can stabilize retained austenite within minutes.
FAQ
What temperature do you austenitize AEB-L?
1925–1975°F, with 1925°F recommended, held 15 min once the steel is fully up to temperature.
What is the best quench for AEB-L?
Plate quench. Never Water, Brine, Parks 50, Duratherm 48, Parks AAA, Canola oil. Plate quench between aluminum or steel plates. Oil quench is not appropriate for stainless. Foil-wrap the blade to prevent decarb.
What HRC does AEB-L reach?
59–64 HRC across the usable tempering range; about 61–63 HRC for a kitchen knife. Temper at 350°F for ~62–63 HRC.
How do you temper AEB-L?
2 passes of 1 h at 350°F for the recommended edge. See the chart above to pick a different tempering temperature for a harder or tougher blade.
Can you forge AEB-L?
AEB-L 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 AEB-L
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 1925°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 AEB-L; 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.