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SPyA provides AISI316 grade stainless accessories, which ones are used in pieces that need high resistance to corrosion (against chemicals, acids and saline atmosphere). Their use are suitable  for naval industry

Steel is a mixture of iron with carbon. The alloy of the steel with chromium achieved a brilliant tone and an excellent resistance to oxidation, and that was the origin of stainless steel. Then, steel alloys would appear with other materials that would achieve that antioxidant effect, but with different characteristics

The first nomenclature on the composition of steels were created in 1912 by  the SAE (Society of Automotive Engineers of the United States) in conjunction with  Steel producers and consumers.  After that, the AISI (American Iron and Steel Institute) nomenclature was created due to the variety of uses of steel in the industry.

Stainless steels are classified into different grades according to their crystalline structure (with the modification of  the alloy elements, different grades are obtained within the same group, to improve some properties):

        • Martensitic Steels – AISI 420
        • Ferritic Steels – AISI 430
        • Austenitic Steels – AISI 304 and AISI 316
        • Austenoferritic Steels – AISI 201 and AISI 202

The chemical composition of grade 316 (in mass percent) is:

        • Carbon – 0.08
        • Manganese – 2.00
        • Phosphorus – 0.04
        • Sulfur – 0.03
        • Silicon – 0.75
        • Chrome – 16.00 to 18.00
        • Nickel – 10.00 to 14.00
        • Molybdenum – 2.00 to 3.00

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