AISI 317L Stainless Steel Plate | 317L China steel mill-Direct Supply
What is AISI 317L Stainless Steel ?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 317L Stainless Steel Plate.
AISI 317L (UNS S31703) is the low-carbon variant of the higher-molybdenum austenitic stainless steel 317. It contains approximately 18–20% chromium, 11–15% nickel and 3–4% molybdenum, with carbon limited to a maximum of 0.03%. The increased molybdenum content provides significantly better resistance to pitting and crevice corrosion in aggressive chloride environments compared with 316/316L, while the extra-low carbon ensures excellent resistance to intergranular corrosion after welding.
AISI 317L is the preferred grade for welded constructions in chemical processing, pulp and paper, pharmaceutical equipment, flue gas desulfurization, marine environments and other applications where the corrosion resistance of 316L is insufficient. The grade is non-magnetic in the annealed condition and offers good formability and toughness.
SHH STEEL supplies AISI 317L as true China steel mill-Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, complete heat traceability and reliable delivery. SHH STEEL offers AISI 317L in plate and sheet form across a practical range of thicknesses and surface finishes.
AISI 317L is frequently compared with a240 316, a240 316l, a240 317, a240 316ti, a240 904l and a240 2205 when selecting materials for more aggressive corrosive service. SHH STEEL provides technical support to help customers choose the most appropriate grade.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | AISI 317L / UNS S31703 | Confirmed |
| Related Standards | ASTM A240, ASME SA240, EN 1.4438, JIS related | Available |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Solution Annealed | Standard |
| Thickness Range | 0.5 mm – 80 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 2000–3000 mm | Available |
| Length | Up to 12000 mm or cut-to-length | Available |
| Surface Finish | 2B, No.1, BA, No.4 | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
SHH STEEL can supply AISI 317L dual-certified to ASTM A240 / ASME SA240 when required by the project.
Chemical Composition
Typical Chemical Composition of AISI 317L (UNS S31703):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 18.00 – 20.00 |
| Nickel (Ni) | 11.00 – 15.00 |
| Molybdenum (Mo) | 3.00 – 4.00 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
The combination of higher molybdenum (3–4%) and extra-low carbon (≤ 0.03%) is the defining feature of AISI 317L. Higher molybdenum significantly enhances resistance to pitting and crevice corrosion in aggressive chloride environments, while the low carbon content effectively prevents intergranular corrosion after welding. SHH STEEL carefully controls composition to ensure consistent corrosion performance.
Mechanical Properties
Annealed Condition (typical values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 485 MPa (70 ksi) |
| Yield Strength (0.2%) | ≥ 170 MPa (25 ksi) |
| Elongation (in 50 mm) | ≥ 40% |
| Hardness | ≤ 217 HB |
AISI 317L has slightly lower strength than standard 317 due to the reduced carbon content, but it retains excellent ductility and toughness. SHH STEEL supplies material with consistent mechanical properties suitable for a wide range of fabrication and welding processes.
Physical Properties Density is approximately 8.00 g/cm³. The grade is non-magnetic in the annealed condition. Melting range is approximately 1370–1400°C.
Material Comparison
| Grade | Mo (%) | Carbon | Pitting Resistance | Weldability & IGC | Typical Preference |
|---|---|---|---|---|---|
| AISI 316L | 2.0–3.0 | ≤ 0.03 | Better | Excellent | Standard welded chloride service |
| AISI 317 | 3.0–4.0 | ≤ 0.08 | Superior | Good | Aggressive chloride (light welding) |
| AISI 317L | 3.0–4.0 | ≤ 0.03 | Superior | Excellent | Welded aggressive chloride service |
| AISI 316Ti | 2.0–3.0 | ≤ 0.08 | Better | Good (stabilized) | High-temp welded chloride service |
| AISI 904L | 4.0–5.0 | ≤ 0.02 | Excellent | Excellent | Highly aggressive chloride / acid service |
| AISI 2205 | 3.0–3.5 | ≤ 0.03 | Excellent | Good | High strength + high chloride resistance |
AISI 317L is the preferred grade whenever both superior pitting resistance and excellent as-welded performance are required in aggressive chloride environments. Compared with a240 316l, the higher molybdenum content provides a clear upgrade in corrosion performance. For even more aggressive conditions, SHH STEEL recommends evaluating a240 904l or duplex grades such as a240 2205.
Corrosion Resistance
AISI 317L offers excellent resistance to atmospheric corrosion, fresh water, food products and many chemical environments. The higher molybdenum content provides superior resistance to pitting and crevice corrosion in chloride-containing media compared with 316L, while the low carbon content ensures excellent resistance to intergranular corrosion after welding.
It performs well in chemical processing, pulp and paper, flue gas desulfurization, pharmaceutical and marine applications where 316L is marginal or insufficient. In extremely aggressive chloride environments or at elevated temperatures, stress corrosion cracking or pitting can still occur. For such conditions, SHH STEEL recommends a240 904l or a240 2205.
Weldability
AISI 317L has excellent weldability using standard fusion and resistance welding methods. Matching or 317L filler metals are commonly used. Because of the very low carbon content, the risk of intergranular corrosion in the as-welded condition is minimal, and post-weld annealing is generally not required.
This outstanding as-welded performance is the main reason SHH STEEL recommends AISI 317L for most welded constructions in aggressive chloride or chemical service instead of standard 317.
Heat Treatment
AISI 317L is normally supplied in the solution-annealed condition by SHH STEEL.
Recommended solution annealing temperature range is 1010–1120°C, followed by rapid cooling (water quench preferred for thicker sections). Proper annealing restores ductility after cold working and optimizes corrosion resistance. SHH STEEL ensures correct heat treatment for consistent performance.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | AISI 317L 2B – most common for general fabrication |
| No.1 | Hot-rolled, annealed and pickled | AISI 317L No.1 – industrial plate |
| BA | Bright Annealed | AISI 317L BA – cleaner surface applications |
| No.4 | Brushed finish | AISI 317L No.4 – architectural surfaces |
SHH STEEL regularly supplies AISI 317L in 2B and No.1 finishes, and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances for AISI 317L Stainless Steel Plate supplied by SHH STEEL generally conform to ASTM A480 practices.
Typical available size range is thickness 0.5 mm – 80 mm, width up to 2000–3000 mm, and length up to 12000 mm or cut-to-length. SHH STEEL provides precise dimensional control and can support tighter tolerances when required.
Equivalent Material Grades
| Grade / Designation | Standard / Region | Notes |
|---|---|---|
| AISI 317L | — | — |
| UNS S31703 | Unified Numbering System | — |
| ASTM A240 Type 317L | ASTM A240 | When dual certified |
| 1.4438 / X2CrNiMo18-15-4 | EN (Europe) | European equivalent |
| SUS317L related | JIS (Japan) | Japanese related grades |
| 022Cr19Ni13Mo3 / related | GB/T (China) | Chinese related grades |
| Related 317 / 316L / 904L | Multiple | Standard / lower-Mo / higher-alloy variants |
Related grades for comparison include a240 316, a240 316l, a240 317, a240 316ti, a240 904l and a240 2205.
Applications
AISI 317L is the preferred grade for welded constructions requiring superior pitting and crevice corrosion resistance in aggressive chloride environments. Typical applications of AISI 317L include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Chemical & Process Industry | AISI 317L tanks, vessels, reactors, piping and process equipment |
| Pulp & Paper | AISI 317L process equipment and structural parts |
| Flue Gas Desulfurization | AISI 317L components in FGD systems |
| Pharmaceutical & Medical | AISI 317L clean equipment, vessels and piping |
| Marine & Offshore | AISI 317L components in aggressive chloride environments |
| Food & Beverage | AISI 317L processing equipment in challenging conditions |
| Water Treatment | AISI 317L tanks, filters and piping systems |
| General Fabrication | AISI 317L welded tanks, frames and structures |
SHH STEEL supplies AISI 317L for these demanding welded and corrosive applications with consistent quality. For related industry solutions, see our petrochemical industry, marine industry and equipment manufacturing pages. Supporting services include steel cutting services and steel welding services.
Why Choose SHH STEEL
SHH STEEL is a China steel mill-Direct Supply specializing in stainless steel plate and sheet. By working directly with major Chinese stainless steel mills, SHH STEEL supplies AISI 317L with the following advantages:
- Genuine China steel mill-Direct Supply pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1)
- Low-carbon higher-molybdenum material optimized for welded aggressive chloride service
- Flexible dimensions and surface finishes (including AISI 317L 2B and AISI 317L No.1)
- Technical support for selection among 316L, 317, 317L, 904L and duplex grades
- Value-added services including steel cutting services, steel welding services and worldwide shipping service
For more information about our company and full product range, please visit China steel Mill Agent-SHH STEEL.
FAQ
- What is the main difference between AISI 317L and AISI 316L?AISI 317L contains higher molybdenum (3–4% vs 2–3%), which provides significantly better resistance to pitting and crevice corrosion in more aggressive chloride environments. SHH STEEL recommends 317L when 316L is not sufficient.
- What is the difference between AISI 317L and AISI 317?AISI 317L has extra-low carbon (≤ 0.03%), giving it excellent resistance to intergranular corrosion after welding. SHH STEEL recommends 317L for most welded constructions.
- Is AISI 317L better than AISI 316Ti for chloride service?Yes, the higher molybdenum content gives 317L superior pitting resistance. 316Ti is preferred when high-temperature stabilization is the main requirement. SHH STEEL can help select the optimal grade.
- Is AISI 317L magnetic?Non-magnetic in the annealed condition. It may become slightly magnetic after heavy cold working. SHH STEEL supplies fully annealed material as standard.
- What is the density of AISI 317L?Approximately 8.00 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Can AISI 317L replace 904L or duplex stainless steels?In many moderately aggressive chloride environments yes, but 904L or duplex grades (such as 2205) offer higher alloy content or strength for more severe conditions. SHH STEEL can help evaluate the best option for your project.
- Does SHH STEEL supply dual-certified ASTM A240 / AISI 317L material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
AISI 317L Stainless Steel Plate is the low-carbon, higher-molybdenum austenitic grade that combines superior resistance to pitting and crevice corrosion with excellent weldability and resistance to intergranular corrosion. It is the preferred material for welded chemical processing equipment, pulp and paper systems, flue gas desulfurization components, pharmaceutical equipment and marine applications in aggressive chloride environments.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 317L Stainless Steel Plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including AISI 317L 2B and AISI 317L No.1), or a competitive quotation.
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