The high levels of these elements assure the alloy has superior chloride pitting and general corrosion resistance to the conventional 304/304L and 316/316L grades. The alloy provides improved resistance relative to 316L in strongly corrosive environments containing sulphurous media, chlorides, and other halides.
Ease of cleaning
Excellent formability
Resistance to oxidation
High strength with low weight
One exception, however, are strongly oxidizing acids such as nitric acid. Alloys that contain molybdenum generally do not perform as well in these environments.
It is used in handling hot organic and fatty acids often present in food and pharmaceutical processing applications. The corrosion resistance of 317 and 317L should be the same in any given environment. Although 317L is somewhat more resistant to stress corrosion cracking than 304/304L stainless steels, because of its higher molybdenum content, it is still susceptible. The higher chromium, molybdenum and nitrogen content of 317L enhance its ability to resist pitting and crevice corrosion in the presence of chlorides and other halides.
PHYSICAL PROPERTIES
Melting Point | Modulus of Elasticity |
2540 – 2630°F 1390 – 1440°C | 29.0 x 106 psi 200 GPa |
CHEMICAL PROPERTIES
Alloy | C | Mn | P | S | Mo | Cu | N |
317L | .30 | 2.00 | .045 | .030 | 3.00-4.00 | .75 | .10 |
WELDING
Alloy 317L can be readily welded by most standard processes. A post weld heat treatment is not necessary. If the final forming temperature falls below this threshold, a solution anneal of 1976 – 2156°F (1080 – 1180°C) is necessary. Rapid quenching is required
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