317L Stainless Steel Sheet
317L Stainless Steel Sheet: Superior Corrosion Resistance for Harsh Environments
317L stainless steel sheet is a low-carbon, high-molybdenum austenitic stainless steel developed primarily for enhanced corrosion resistance in aggressive chemical environments. It is especially valued in industries like chemical processing, marine applications, and pulp and paper manufacturing. The alloy is a modified version of 316L with increased levels of molybdenum, chromium, and nickel, delivering better resistance to pitting, crevice corrosion, and general corrosion.
Chemical Composition (Typical, %)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 18.0–20.0 |
| Nickel (Ni) | 11.0–15.0 |
| Molybdenum (Mo) | 3.0–4.0 |
| Iron (Fe) | Balance |
Key Properties
✅ Corrosion Resistance
Outstanding resistance to a wide range of corrosive chemicals.
Superior pitting and crevice corrosion resistance compared to 316L, especially in chloride-rich and acidic environments.
Excellent resistance to sulfide and halide attacks.
✅ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% offset) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness (Brinell) | ≤ 217 HB |
✅ Weldability and Fabrication
Low carbon content minimizes carbide precipitation during welding, reducing the risk of intergranular corrosion.
Readily formable and weldable using common techniques like TIG, MIG, and resistance welding.
Common Applications
Chemical Processing Equipment – tanks, pipes, heat exchangers exposed to harsh chemicals.
Pulp and Paper Industry – digesters, bleach washers, and other components in acidic environments.
Pharmaceutical Equipment – where corrosion resistance and cleanliness are critical.
Marine Applications – structural parts in salty or brackish water.
Flue Gas Desulfurization Systems – due to its excellent resistance to acidic condensates.
Advantages Over 316L
317L contains more molybdenum and nickel than 316L, giving it stronger corrosion resistance, especially against chlorides and reducing agents.
Better suited for high-temperature and high-concentration chemical environments.
Lower carbon content improves its performance after welding or forming.
Available Forms and Finishes
317L stainless steel sheets are available in various finishes such as:
2B (mill finish) – smooth, reflective surface for industrial applications.
BA (bright annealed) – highly reflective, mirror-like surface.
No. 4 – brushed finish for architectural and kitchen applications.
Customized finishes for decorative or functional purposes.
Thicknesses typically range from 0.3 mm to 6.0 mm, with custom sizes available upon request.
317L stainless steel sheet is a premium-grade material engineered for high-performance applications where corrosion is a significant concern. Its enhanced composition and properties make it ideal for use in aggressive environments, outperforming standard austenitic stainless steels like 304 and 316. For industries demanding durability, weldability, and long-term performance, 317L is a trusted choice.
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