D2 is an air hardening steel so it doesn't need a salt bath. The best solution though is Paul Bos. I think he charges $12 for a single blade, and maybe a couple $ more for big ones, but he'll treat it like he ground it himself and will NEVER send you back a warped blade EVER! All my blades warp. I know, I used to do it myself. They can be straightened though and that's what Paul does.
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