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Austenite 317L Stainless Steel
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Austenite 317L (UNS S31726)
General Properties
Alloy 317LMN and 317L are molybdenum-bearing austenitic stainless steels with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steels such as Alloy 304. In addition, 317LMN and 317L alloys offer higher creep, stress-to-rupture, and tensile strengths at elevated temperatures than conventional stainless steels. All are low carbon or "L" grades to provide resistance to sensitization during welding and other thermal processes. The "M" and "N" designations indicate that the compositions contain increased levels of molybdenum and nitrogen respectively. The combination of molybdenum and nitrogen is particularly effective in enhancing resistance to pitting and crevice corrosion, especially in process streams containing acids, chlorides, and sulfur compounds at elevated temperatures. Nitrogen also serves to increase the strength of these alloys. Both alloys are intended for severe service conditions such as flue gas desulfurization (FGD) systems.
Composition
Chemical Composition in Weight Percent per ASTM A240 for Cited Alloys |
Element |
Type 317L |
Type 317LMN |
Carbon |
0.03 max |
0.03 max |
Manganese |
2.00 |
2.00 |
Silicon |
0.75 max |
0.75 max |
Chromium |
18.00 - 20.00 |
17.00 - 20.00 |
Nickel |
11.00 - 15.00 |
13.50 - 17.50 |
Molybdenum |
3.00 - 4.00 |
4.00 - 5.00 |
Phosphorus |
0.04 max |
0.04 max |
Sulfur |
0.03 max |
0.03 max |
Nitrogen |
0.10 max |
0.10 - 0.20 |
Iron |
Balance |
Balance |
UNS No. |
S31703 |
S31726 |
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Date:2011/1/10 |
Last:Heat Resisting Steel SUS310S
Next:Austenite 316L Stainless Steel
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