![]() ![]() Grade 316 is suitable for the construction of deck fittings and critical rigging components where salt can concentrate due to evaporation and lie in crevices - conditions which can cause pitting of 304. Grade 304 is usually only suitable for fittings which are frequently washed with fresh water. In grades 304 and 316, about 18% of chromium is added to generate this film and, in 316, 2% molybdenum is added to further improve the corrosion resistance. ![]() Stainless steel's corrosion resistance depends on the formation of a "passive" chromium oxide film on the metal surface which is highly resistant to corrosion. Grades 304 and 316 are austenitic (300 series) stainless steels due to their metallurgical structure (austenite) which gives them excellent ductility, good strength, non-magnetic properties, good weldability and very good corrosion resistance. The current industry standard, however, is grade 316 (UNS S31600/S31603 - commonly termed "marine grade" stainless) which offers a solution to around 90% of marine applications. Stainless steel, on the other hand, is recognised as the premium material for marine applications where it is used for its excellent corrosion resistance, lustre, strength and stiffness.įor many boating applications grade 304 (UNS S30400/S30403) stainless steel fittings have proven adequate. While aluminium is light, it has limited corrosion resistance in seawater and requires significant maintenance. ![]() The metals most commonly used today in the construction of yachts, marine structures and fittings are stainless steel and aluminium. ![]()
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