High Quality Stainless Steel Sheets & Plates
317 / 317L • Formable • Ductile • Machinable
Get a QuoteStainless Steel 317 / 317L Explained
Stainless Steel 317 and 317L are high-molybdenum austenitic stainless steels specifically developed for superior corrosion resistance in highly aggressive chemical environments. With higher molybdenum and chromium content than 316, these grades offer outstanding resistance to pitting, crevice corrosion, and strong acidic solutions. SS 317 provides excellent mechanical strength, while SS 317L, with lower carbon, ensures better weldability and resistance to intergranular corrosion.
Primarily used in chemical processing equipment, acid-handling systems, fertilizer plants, pulp and paper industries, and petrochemical refineries, SS 317/317L are ideal for applications requiring maximum corrosion resistance and long service life under severe chemical exposure.
317/317L STAINLESS STEEL SHEETS AND PLATES EQUIVALENT GRADES
| STANDARD | UNS | WNR. | JIS | EN |
|---|---|---|---|---|
| SS 317 | S31700 | 1.4449 | SUS 317 | – |
| SS 317L | S31703 | 1.4438 | SUS 317L | X2CrNiMo18-15-4 |
SPECIFICATION OF STAINLESS STEEL 317/317L SHEETS AND PLATES
| Standard | ASTM A240 / ASME SA240 |
|---|---|
| Dimension Standard | JIS, AISI, ASTM, GB, DIN, EN, etc |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Thickness | 0.3 mm to 120 mm |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Surface Finishing | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc. |
CHEMICAL COMPOSITION OF STAINLESS STEEL 317/317L SHEETS AND PLATES
| Grade | C% | Mn% | Si% | P% | S% | Cr% | Mo% | Ni% | N% |
|---|---|---|---|---|---|---|---|---|---|
| 317 | 0.08 max | 2.0 max | 1.0 max | 0.040 max | 0.03 max | 18-20 | 3-4 | 11-14 | – |
| 317L | 0.035 max | 2.0 max | 1.0 max | 0.040 max | 0.03 max | 18-20 | 3-4 | 11-15 | – |
MECHANICAL & PHYSICAL PROPERTIES OF STAINLESS STEEL 317/317L SHEETS AND PLATES
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1454°C (2650°F) |
| Tensile Strength | 75,000 Psi (515 MPa) |
| Yield Strength (0.2% Offset) | 30,000 Psi (205 MPa) |
| Elongation | 35% |
💡 Practical Difference in Use
Use Stainless Steel 317 when: very high resistance to acids, chlorides, and aggressive chemical environments is required along with superior pitting and crevice corrosion resistance.
→ Example: chemical processing equipment, flue gas desulfurization systems, pulp & paper plant equipment, and acid handling systems.
Use Stainless Steel 317L when: enhanced weldability with maximum resistance to intergranular corrosion is required for heavily welded structures in severe corrosive environments. → Example: chemical storage tanks, scrubbers, pressure vessels, pipelines, and pharmaceutical processing equipment.
Applications of Stainless Steel 317 / 317L Sheets and Plates
Stainless Steel 317 and 317L are widely used in industries where extremely high corrosion resistance, especially against acids and chlorides, is essential for long service life.
- Chemical Processing Industry: Ideal for handling aggressive acids and corrosive process fluids.
- Pulp & Paper Industry: Resistant to acidic bleaching and digesting chemicals.
- Pollution Control Equipment: Excellent performance in scrubbers and flue gas systems.
When to Choose Stainless Steel 317 vs. 317L?
The selection depends mainly on corrosion severity, welding requirements, and fabrication conditions.
Choose SS 317 when:
- Maximum pitting and crevice corrosion resistance is required
- Higher molybdenum content is beneficial
- Used in strong acidic and chloride-rich environments
- Higher mechanical strength is preferred over weldability
- Applications involve limited welding
- Long-term corrosion durability is critical
Choose SS 317L when:
- Extensive welding is required
- Maximum resistance to intergranular corrosion is essential
- No post-weld heat treatment is possible
- Used in fabrication of tanks, vessels, and pipelines
- Improved corrosion resistance at weld zones is required
- Low carbon content is advantageous
Industries That Use Stainless Steel 317 / 317L Sheets and Plates
These grades are preferred in industries where exposure to highly corrosive chemicals, acids, and chloride environments is severe.
Primary application area for extreme corrosion resistance.
Uses
Reactors, heat exchangers, acid storage tanks, pipelines.
Why SS 317/317L?
Superior resistance to strong acids and chlorides.
Used in highly acidic bleaching and digestion processes.
Uses
Digesters, evaporators, bleach plant equipment.
Why SS 317?
High molybdenum content improves acid resistance.
Essential for flue gas and acid gas treatment systems.
Uses
Scrubbers, ducting systems, chimney liners.
Why SS 317L?
Excellent weld corrosion resistance and durability.
Used for aggressive chemical formulations.
Uses
Reactors, storage vessels, process piping.
Why SS 317L?
Cleanability and strong corrosion resistance.
Used in sour and corrosive process environments.
Uses
Heat exchangers, separators, pipelines.
Why SS 317?
Excellent resistance to chlorides and acidic media.
Used in desalination and aggressive water systems.
Uses
Evaporators, brine concentrators, piping systems.
Why SS 317L?
Superior resistance to chloride-rich water.
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