Alloy 316/316L (UNS S31600/S31603) is an austenitic chromium-nickel-molybdenum stainless steel developed to provide improved corrosion resistance to alloy 304/304L in moderately corrosive environments. It is often used in process streams containing chlorides or halides. The addition of molybdenum improves the overall resistance to corrosion and pitting chloride. It also provides higher creep, stress-to-tear, and tensile strength at elevated temperatures. It is common practice to double certify 316L as 316 and 316L. The low-carbon chemistry of 316L combined with the addition of nitrogen allows 316L to meet the mechanical properties of 316. Alloy 316/316L resists atmospheric corrosion, as well as moderately oxidizing and reducing the environment. It also resists corrosion in polluted marine atmospheres. The alloy has excellent resistance to intergranular corrosion in the as-welded state. Alloy 316/316L has excellent strength and hardness at cryogenic temperatures. Alloy 316/316L is non-magnetic in the annealed state, but may become slightly magnetic as a result of cold operation or welding. It can be easily welded and processed with standard store-making practices.

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