I agree with you, how can black iron be good but 304 stainless not but there it is on their table of materials nevertheless. McMaster-Carr carries Sch80 SS in 316L. If nothing else you can use them for price comparison.
https://www.mcmaster.com/pipe/thick-...ples-and-pipe/
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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