About 317L Stainless Steel
Alloy 317L (UNS S31703) is a molybdenum-bearing austenitic stainless steel with greatly increased resistance to chemical attack as compared to the conventional chromium-nickel austenitic stainless steels such as Alloy 304. In addition, Alloy 317L offers higher creep, stress-to-rupture, and tensile strength at elevated temperatures than conventional stainless steels. It is a low carbon or "L" grade which provides resistance to sensitization during welding and other thermal processes.
Alloy 317L has excellent corrosion resistance to a wide range of chemicals. It resists attack in sulfuric acid, acidic chlorine and phosphoric acid. 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. The one exception is where the alloy will be exposed to temperatures in the chromium carbide precipitation range of 800 – 1500°F (427 – 816°C). Because of its low carbon content, 317L is the preferred material in this service to guard against intergranular corrosion.
In general, austenitic stainless steels are subject to chloride stress corrosion cracking in halide service. 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.
Regular Size in stock of our 317L Stainless Steel Plate
| Type | Thickness | Standard size |
| cold rolled | 0.4mm 0.5mm 0.6mm 0.8mm 1.0mm 1.2mm 1.5mm 2.0mm 2.5mm 3.0mm | 1000*2000mm | 1219*2438mm |
| hot rolled | 3.0mm 4.0mm 5.0mm 6.0mm 8.0mm 10.0mm 12.0mm 14.0mm 16.0mm | 1500*6000mm |
| forged | ＞16mm | 1500*6000mm or as required |
Difference between 304 316L and 317L Stainless Steel
| ALLOY | Composition (Weight Percent) | PREN1 |
| Cr | Mo | N |
| 304 Stainless Steel | 18.0 | — | 0.06 | 19.0 |
| 316 Stainless Steel | 16.5 | 2.1 | 0.05 | 24.2 |
| 317L Stainless Steel | 18.5 | 3.1 | 0.06 | 29.7 |
| SSC-6MO | 20.5 | 6.2 | 0.22 | 44.5 |
Chemical Analysis
Weight % (all values are maximum unless a range is otherwise indicated)
| Chromium | 18.0 min.-20.0 max. | Phosphorus | 0.045 |
| Nickel | 11.0 min.-15.0 max. | Sulfur | 0.030 |
| Molybdenum | 3.0 min. - 4.0 max. | Silicon | 0.75 |
| Carbon | 0.030 | Nitrogen | 0.10 |
| Manganese | 2.00 | Iron | Balance |
Mechanical Properties
Values at 68°F (20°C) (minimum values, unless specified)
Yield Strength
0.2% Offset | Ultimate Tensile
Strength | Elongation
in 2 in. | Hardness |
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | (max.) |
| 30,000 | 205 | 75,000 | 515 | 40 | 95 Rockwell B |
Applications
- Air Pollution Control — flue gas desulfurization systems (FGD)
- Chemical and Petrochemical Processing
- Explosives
- Food and Beverage Processing
- Petroleum Refining
- Power Generation — condensers
- Pulp and Paper
