QuenchFast oil (Parks 50) — low hardenability, similar to 1095; not a true oil-hardening steel
Temper2× 2 h · cool to room temp between cycles
Reliable hardness61–65 HRC
Uddeholm razor steel ("Spicy White") — very fine carbide, very high hardness for fine cutting edges. KSN recommends temper 300–350°F; up to 450°F pushes it toward general knives (~61 HRC). Do NOT temper above 450°F (embrittlement at 500°F) or below 200°F.
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
65 HRC
350°F
177°C
63.5 HRC
450°F
232°C
61 HRC
Composition (typical, wt%)
Element
%
C
1.26%
Cr
0.25%
Mn
0.3%
Si
0.25%
Uddeholmstrip UHB 26C3 typical (via KSN)
HeatTreatBench — the recipes in your shop, offline
Get the full 26C3 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.