Alloys 316 (UNS S31600) and 316L (UNS S31603) are molybdenum containing austenitic stainless steels that are more resistant to overall corrosion and pitting/crevice corrosion than traditional chromium nickel austenitic stainless steels such as alloy 304. These alloys also provide higher creep, fracture stress, and tensile strength at elevated temperatures. In addition to excellent corrosion resistance and strength properties, alloy 316 and 316L Cr-Ni-Mo alloys also provide the excellent machinability and formability of typical austenitic stainless steel.
General Properties
Alloy 316/316L (UNS S31600/S31603) is a chromium nickel molybdenum austenitic stainless steel developed to improve the corrosion resistance of alloy 304/304L in moderately corrosive environments. It is typically used in process streams containing chlorides or halides. The addition of molybdenum improves the ability to resist general corrosion and chloride pitting. It also provides higher creep, fracture stress, and tensile strength at high temperatures.
It is common practice for 316L to be dual certified as 316 and 316L. The combination of low carbon chemistry and nitrogen addition of 316L enables 316L to meet the mechanical properties of 316.
Alloy 316/316L is resistant to atmospheric corrosion and moderate oxidation and reduction environments. It can also resist corrosion in the polluted marine atmosphere. The alloy has excellent resistance to intergranular corrosion in the welded state. Alloy 316/316L has excellent strength and toughness at low temperatures.
Alloy 316/316L is nonmagnetic in the annealed state, but can become slightly magnetic during cold working or welding. It can be easily welded and processed through standard shop manufacturing practices.
Element 316L
Chromium 16.0 min. - 18.0 max
Nickel 10.0 min. - 14.0 max
Molybdenum 2.00 min. - 3.00 max
Carbon 0.030
Manganese 2.00
Phosphorus 0.045
Sulfur 0.03
Silicon 0.75
Nitrogen 0.1
Iron balance
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