Exam Question
What are the major types of stainless steels used on merchant ships? Briefly explain each type. Which grades would you recommend for use in sea water environment? Why?
Class 2 (2nd Engineer)
MEKG
📅 Jul 2022
Reference Answer
On merchant ships, the major types of stainless steels used are austenitic , ferritic , martensitic , and duplex . For use in a seawater environment, Grade 316/316L and duplex stainless steels are recommended due to their superior resistance to chloride-induced corrosion.
Major Types of Stainless Steels Used on Ships 🚢
Austenitic Stainless Steel
These are the most common types of stainless steels used on ships, particularly Grades 304 and 316 . They contain high levels of chromium and nickel, providing excellent corrosion resistance and ductility. They're non-magnetic and are widely used for deck fittings, tanks, and pipelines. The 316 grade is particularly notable as it contains molybdenum , which significantly boosts its resistance to chloride and pitting corrosion.
Major Types of Stainless Steels Used on Ships 🚢
Austenitic Stainless Steel
These are the most common types of stainless steels used on ships, particularly Grades 304 and 316 . They contain high levels of chromium and nickel, providing excellent corrosion resistance and ductility. They're non-magnetic and are widely used for deck fittings, tanks, and pipelines. The 316 grade is particularly notable as it contains molybdenum , which significantly boosts its resistance to chloride and pitting corrosion.
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