AISI 317 Stainless Steel Plate | 317 China steel mill-Direct Supply
What is AISI 317 Stainless Steel?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 317 Stainless Steel Plate.
AISI 317 (UNS S31700) is a higher-molybdenum austenitic stainless steel containing approximately 18–20% chromium, 11–15% nickel and 3–4% molybdenum. The increased molybdenum content provides significantly better resistance to pitting and crevice corrosion in chloride-containing environments compared with standard 316. It also offers good general corrosion resistance, formability and toughness.
AISI 317 is used in chemical processing, pulp and paper, pharmaceutical equipment, flue gas desulfurization and other applications where the corrosion resistance of 316 is insufficient. The grade is non-magnetic in the annealed condition. The low-carbon version 317L is more commonly specified for welded constructions to minimize the risk of intergranular corrosion.
SHH STEEL supplies AISI 317 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 317 in plate and sheet form across a practical range of thicknesses and surface finishes.
AISI 317 is frequently compared with a240 316, a240 316l, a240 317l, a240 316ti, a240 304 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 317 / UNS S31700 | Confirmed |
| Related Standards | ASTM A240, ASME SA240, EN, 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 317 dual-certified to ASTM A240 / ASME SA240 when required by the project.
Chemical Composition
Typical Chemical Composition of AISI 317 (UNS S31700):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| 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 higher molybdenum content (3–4%) is the key feature that distinguishes AISI 317 from standard 316 (2–3% Mo). This increase significantly enhances resistance to pitting and crevice corrosion in more aggressive chloride environments. SHH STEEL carefully controls composition to ensure consistent corrosion performance.
Mechanical Properties
Annealed Condition (typical values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa (75 ksi) |
| Yield Strength (0.2%) | ≥ 205 MPa (30 ksi) |
| Elongation (in 50 mm) | ≥ 40% |
| Hardness | ≤ 217 HB |
AISI 317 offers mechanical properties similar to the 316 family, with good strength, excellent ductility and toughness. SHH STEEL supplies material with consistent mechanical properties suitable for a wide range of fabrication 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 | Typical Preference |
|---|---|---|---|---|---|
| AISI 316 | 2.0–3.0 | ≤ 0.08 | Better | Good | General chloride environments |
| AISI 316L | 2.0–3.0 | ≤ 0.03 | Better | Excellent | Welded chloride service |
| AISI 317 | 3.0–4.0 | ≤ 0.08 | Superior | Good | More aggressive chloride environments |
| 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 2205 | 3.0–3.5 | ≤ 0.03 | Excellent | Good | High strength + high chloride resistance |
AISI 317 provides a clear upgrade in pitting and crevice corrosion resistance over a240 316 and a240 316l due to the higher molybdenum content. When extensive welding is required, SHH STEEL recommends the low-carbon version a240 317l. In highly aggressive environments or when higher strength is also needed, duplex grades such as a240 2205 may be considered.
Corrosion Resistance
AISI 317 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 316.
It performs well in chemical processing, pulp and paper, flue gas systems and marine-related applications where 316 is marginal. In extremely aggressive chloride environments or at elevated temperatures, stress corrosion cracking or pitting can still occur. For such conditions, SHH STEEL recommends evaluating a240 317l or a240 2205.
Weldability
AISI 317 has good weldability using standard fusion welding methods. Matching or 317/317L filler metals are commonly used. Because of its carbon content (up to 0.08%), it can be susceptible to intergranular corrosion after welding if not properly treated.
For heavy welded constructions or when post-weld heat treatment is not practical, SHH STEEL recommends a240 317l.
Heat Treatment
AISI 317 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 317 2B – most common for general fabrication |
| No.1 | Hot-rolled, annealed and pickled | AISI 317 No.1 – industrial plate |
| BA | Bright Annealed | AISI 317 BA – cleaner surface applications |
| No.4 | Brushed finish | AISI 317 No.4 – architectural surfaces |
SHH STEEL regularly supplies AISI 317 in 2B and No.1 finishes, and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances for AISI 317 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 317 | — | — |
| UNS S31700 | Unified Numbering System | — |
| ASTM A240 Type 317 | ASTM A240 | When dual certified |
| 1.4449 / related | EN (Europe) | Closest European grades |
| SUS317 related | JIS (Japan) | Japanese related grades |
| 0Cr19Ni13Mo3 related | GB/T (China) | Chinese related grades |
| Related 317L | Multiple | Low-carbon variant |
Related grades for comparison include a240 316, a240 316l, a240 317l, a240 316ti, a240 304 and a240 2205.
Applications
AISI 317 is selected for applications requiring better pitting and crevice corrosion resistance than 316. Typical applications of AISI 317 include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Chemical & Process Industry | AISI 317 tanks, vessels, reactors, piping and process equipment |
| Pulp & Paper | AISI 317 process equipment and structural parts |
| Flue Gas Desulfurization | AISI 317 components in FGD systems |
| Pharmaceutical & Medical | AISI 317 clean equipment and vessels |
| Marine & Offshore | AISI 317 components in more aggressive chloride environments |
| Food & Beverage | AISI 317 processing equipment in challenging conditions |
| General Fabrication | AISI 317 tanks, frames and welded structures |
SHH STEEL supplies AISI 317 for these more demanding 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 317 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)
- Higher-molybdenum material optimized for improved pitting resistance
- Flexible dimensions and surface finishes (including AISI 317 2B and AISI 317 No.1)
- Technical support for selection among 316, 316L, 317, 317L 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 317 and AISI 316?AISI 317 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 317 when 316 is not sufficient.
- Should I choose AISI 317 or AISI 317L?AISI 317L (low carbon) is preferred for heavy welded constructions to minimize the risk of intergranular corrosion. SHH STEEL can supply both grades according to project requirements.
- Is AISI 317 better than AISI 316L for chloride service?Yes, the higher molybdenum content gives 317 superior pitting resistance. However, for welded service, 317L is usually the better choice. SHH STEEL can help select the optimal grade.
- Is AISI 317 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 317?Approximately 8.00 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Can AISI 317 replace duplex stainless steels?In some moderate chloride environments yes, but duplex grades such as 2205 offer higher strength and often better overall chloride resistance. SHH STEEL can help evaluate the best option.
- Does SHH STEEL supply dual-certified ASTM A240 / AISI 317 material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
AISI 317 Stainless Steel Plate is a higher-molybdenum austenitic grade that offers superior resistance to pitting and crevice corrosion compared with 316. It is an excellent choice for chemical processing, pulp and paper, flue gas systems and other applications where the corrosion performance of 316 is insufficient.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 317 Stainless Steel Plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including AISI 317 2B and AISI 317 No.1), or a competitive quotation.
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