Posted by Sarup Chopra on June 24, 2008 at 16:01:56:
In Reply to: Re: etchant for austenitic 304 and 316 stainless steel posted by laffineur eric on June 24, 2008 at 14:46:18:
Oxalic electrolytic etch is certainly the best option for 3xx series austenitic stainless steels. It's just that not all the labs have the electrolytic etching setup. I've found the following immersion etchant to yield good results as well:
45 ml glycerol
15 ml HNO3(65%)
30 ml HCL(32%)
Mix fresh before use and do NOT store.