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SAE 316L grade stainless steel, sometimes referred to as A4 stainless steel or marine grade stainless steel, is the second most common austenitic stainless steel after 304/A2 stainless steel. Its primary alloying constituents after iron, are chromium, nickel (10–12%) and molybdenum (2–3%), up to 2% manganese, with small (<1%) quantities of silicon, phosphorus & sulfur also present. The addition of molybdenum provides greater corrosion resistance than 304, with respect to localized corrosive attack by chlorides, hydrogen embrittlement and to general corrosion by reducing acids, and other acids such as sulfuric acid; while sulfur is added to improve ease-of-tooling/machinability. 316L grade is the low carbon version of 316 stainless steel, which improves relative corrosion-resistance. When cold worked, 316 can produce high yield and tensile strengths similar to duplex stainless grades.
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