317L
UNS S31703
Overview
Molybdenum-enhanced austenitic stainless steel offering superior corrosion resistance to 316L, especially in acidic and chloride-containing environments. The higher molybdenum content (3-4%) provides improved resistance to pitting and crevice corrosion. 317L (low carbon) is the standard grade for welded applications. Commonly used in flue gas desulfurization, chemical processing, and pulp & paper industries.
Chemical Composition (wt%)
| Element | Min | Max |
|---|---|---|
| C (Carbon) | — | 0.03 |
| Mn (Manganese) | — | 2 |
| Si (Silicon) | — | 1 |
| P (Phosphorus) | — | 0.045 |
| S (Sulfur) | — | 0.03 |
| Cr (Chromium) | 18 | 20 |
| Ni (Nickel) | 11 | 15 |
| Mo (Molybdenum) | 3 | 4 |
Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | ≥ 485 MPa (70 ksi) | — |
| Yield Strength (0.2%) | ≥ 170 MPa (25 ksi) | — |
| Elongation | ≥ 40% | — |
| Hardness | ≤ 90 HRB | annealed |
| Density | 8.0 g/cm³ | — |
Physical Properties
| Property | Value |
|---|---|
| Melting Range | 1375 – 1400 °C |
| Thermal Conductivity | 14.0 W/m·K (at 100°C) |
| PREN | 29 – 34 |
Corrosion Resistance
Approximately 50% better pitting resistance than 316L due to the higher molybdenum content. Excellent resistance to sulfuric acid, phosphoric acid, and sulfurous acid compounds. Superior performance in flue gas desulfurization (FGD) environments where acidic condensates form. Good resistance to chloride SCC. More resistant to sensitization than standard 317.
Typical Applications
Related Standards
Available Products in This Material
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