> Use a weathering steel, also known as “COR-TEN” steel which contains up to 21% of alloying elements such as chromium, copper, nickel, and phosphorous. The all

> Use a weathering steel, also known as “COR-TEN” steel which contains up to 21% of alloying elements such as chromium, copper, nickel, and phosphorous. The alloys form a protective rust patina which reduces the corrosion rate with time. COR-TEN steel tends to be cheaper than stainless steel. If the point is for the ship to look 'not-rusty', Cor-Ten is probably about as far from that goal as one can get