woko said..
Perhaps cost ? Not just the basic material but also welding rods, drill abilities, etc. I've just rebuilt my gunnel rail with 304, got 70 of the 74 drill holes in the right place, now I have to devise a way to mount the little pedestal drill in situ to redrill the 4 offenders. It happens
Glory that's a big effort. Lots of drill bit sharpening I assume.
Yes cost is the main problem but super duplex grade stainless needs to be used for better corrosion resistance. Google "stainless steel in boat construction" and numerous good links will come up, the best being;
www.asminternational.org/web/hts/news/newswire/-/journal_content/56/10180/21839692/NEWSwww.ssy-usa.com/pdf/2020_08_07_IMOA_MR_0220_ships.pdfBut it looks like SSYS went bankrupt in 2021 so that probably tells a story
www.allabolag.se/5567701015/stainless-steel-yachts-sweden-abUnderwater super duplex stainless finished to mirror polish to avoid growth - no afouling. Above water suitable 2 pack paints.
Looks like if the life cycle cost model is used and the life is long enough, and utilisation / availability high enough, then the reduced slipping and afouling costs could outweigh the initial capex costs. Albeit very rare to see purchasing depts and accountants agree to high capex purchases, whatever the industry.