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Marine-grade stainless steel, also known as marine stainless steel or marine-grade stainless, refers to a specific type of stainless steel that is highly resistant to corrosion in marine environments. The corrosive nature of saltwater and exposure to other harsh conditions make marine-grade stainless steel essential for marine applications.

Here are some grades of marine stainless steel:

• 316 stainless steel: This is the most widely used marine stainless steel grade. It offers excellent corrosion resistance, high strength, and good weldability. It is suitable for a wide range of marine applications, including boat fittings, marine hardware, and underwater components.

• 316L stainless steel: Similar to 316 stainless steel, but with lower carbon content to improve corrosion resistance in welded structures. It is often used in welded applications to prevent sensitization to corrosion.

• 2205 duplex stainless steel: This grade offers a higher level of corrosion resistance compared to 316 stainless steel. It has a dual-phase microstructure and provides excellent strength, making it suitable for offshore and marine applications.