QuenchPlate quench (aluminum plates) + compressed air to ≤125°F
Cryo / sub-zeroRequired — dry ice (-100°F) or LN2 — soak ~1hr after quench to convert retained austenite
Temper2× 2 h · cool to room temp between cycles
Reliable hardness58–64 HRC
Nitrogen-enhanced AEB-L variant from NJSB — proprietary grade, NJSB datasheet is authoritative. Plate quench + cryo.
Temper → hardness chart
Approximate HRC after a double-temper at each temperature (from the sources below). Set your target and pick the matching temper.
Temper °F
Temper °C
Hardness
300°F
149°C
64 HRC
350°F
177°C
63 HRC
400°F
204°C
62 HRC
450°F
232°C
61 HRC
500°F
260°C
60 HRC
600°F
316°C
58 HRC
Composition (typical, wt%)
Element
%
C
0.68%
Cr
13%
V
0.08%
Mn
0.65%
Si
0.4%
N
0.11%
Buderus mill cert via NJSB
HeatTreatBench — the recipes in your shop, offline
Get the full Nitro-V recipe plus 25 more steels offline — set your target HRC and the app gives you the exact temper, with a forge timer and a per-blade log. Works in the shop with no signal.