316/316L and 316L Project 70+
316 (316/316L) is an austenitic stainless steel that was developed as an improvement to 304/304L. The grade’s primary benefits relate to its strong resistance to corrosion and is frequently used in production processes where chlorides and halides are present. Specifications include but are not limited to AMS 5524 and ASTM A240. 316L is a low carbon version of 316, with a max carbon of 0.03%. 316L Project 70+ is reported to have superior machinability characteristics versus 316L.
Due to the material’s strong resistance to corrosion, 316 is used in a wide range of applications:
- Pharmaceutical equipment
- Valve trim
- Furnace parts
- Vessel parts
As a chromium-nickel-molybdenum austenitic grade of stainless steel, 316 is resistant to corrosion in environments where chlorides or halides are present. The addition of molybdenum results in higher stress-to-rupture and tensile strength at high temperatures.
316 is not magnetic in the annealed condition. However, it becomes slightly magnetic after cold working or welding.
316 has a melting range of 2,500 °F – 2,550 °F. The material has a tensile strength of 84 ksi and a maximum use temperature of approximately 800˚C.
The grade meets various standard industry specification requirements including AMS 5524 and ASTM A240.
Austenitic Stainless Steel (316/316L Classification)
Stainless steels fall into four main categories: martensitic, austenitic, ferritic, and duplex. Austenitic is the largest family of stainless steels and is not hardenable by heat treatment due to their microstructure.
Austenitic material can be sub-divided into two categories:
1) 200 series are chromium-manganese-nickel alloys that minimize the use of nickel. The addition of nickel increases yield strength by 50% relative to 300 series stainless steels.
2) 300 is the mostly widely used group of stainless steels. This serious achieves an austenitic microstructure almost exclusively through the utilization of nickel although some highly-allowed grades include some nitrogen.
Relative to other austenitic material, 316 is defined by the addition of molybdenum (2%) which improves its resistance to corrosion.
316/316L and 316L Project 70+ Summary Information
|AMS 5524, ASTM A24||Medical, Aerospace, Industrial||Pharmaceutical equipment, Valve trim , Digesters, Tanks, Evaporators, Furnace Parts, Vessel Parts||Bar|
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