321 stainless has 9-12% Nickel, 17-19% Chromium, and some Titanium. This grade has superior resistance to intergranular corrosion and is recommended for high-temperature and welded applications (but type 347 with Niobium in place of Titanium is preferred for weld filler). 321SS might be suitable for hooks and wire forms in especially difficult environments. Its price is significantly higher than that of 304SS, however.

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