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- Oct 14, 1998
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17-4 is a precipitation hardening stainless used for lots of gun parts. 410 & 416 are not precipitation hardening.M Wadel said:i remember reading something about stainless steels for guns and similar. they are precipation hardening low carbon, may be wrong tho. its sounds possible since you wont have the same problems with formstability i suppose, they keep their shape after hardening/aging because they need lower temps. does anybody know if this is correct?