If you heat-treat air-hardening stainless steels, plate quenching is the technique that keeps your blades flat and cools them fast enough to harden properly. It's simple, cheap to set up, and dramatically reduces warping compared to still-air cooling.
Air-hardening stainless and PM steels don't need an oil quench, they'll harden in still air. But still air is slow and uneven, which invites warping and can leave you short of full hardness. Aluminum plates pull heat out of the blade fast and evenly from both sides, and their flat, clamped surfaces hold the blade straight as it cools.
| Item | Notes |
|---|---|
| Two aluminum plates | ~1" thick, flat, sized to your blades |
| Clamps | To press plates together quickly |
| Compressed air (optional) | Speeds cooling further |
| Heat-treat foil | Blade stays wrapped during the quench |
Speed matters: the plates need to make contact fast, so have everything staged before the blade comes out. Keep the plates flat and clean, since any warp or debris transfers straight to the blade.
Plate quenching is the go-to for stainless like AEB-L and air-hardening tool and PM steels. Simple carbon steels (1084, 80CrV2, O1) are oil-quenched instead, since they need a faster, more aggressive quench than plates provide. Matching the quench to the steel is one of the fundamentals of good heat treating.
A precise oven plus a plate-quench setup is the winning combo for stainless. I'll help you get the oven right. Spencer — (801) 839-5882.
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