AISI 317LM Stainless Steel Plate | 317LM China steel mill-Direct Supply
What is AISI 317LM Stainless Steel?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 317LM Stainless Steel Plate.
AISI 317LM (UNS S31725) is a low-carbon, higher-molybdenum austenitic stainless steel developed as an upgrade within the 317 family. It typically contains approximately 18–20% chromium, 13–17% nickel and 4.0–5.0% molybdenum, with carbon limited to a maximum of 0.03%. The elevated molybdenum content provides significantly better resistance to pitting and crevice corrosion in aggressive chloride environments compared with standard 317L (3–4% Mo) and 316L.
AISI 317LM is particularly suitable for welded constructions in chemical processing, pulp and paper, flue gas desulfurization, pharmaceutical equipment, offshore and other applications where the corrosion resistance of 317L is marginal. The grade is non-magnetic in the annealed condition and offers good formability, toughness and excellent weldability due to its low carbon content.
SHH STEEL supplies AISI 317LM 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 317LM in plate and sheet form across a practical range of thicknesses and surface finishes.
AISI 317LM is frequently compared with a240 317l, a240 316l, a240 904l, a240 316, a240 2205 and a240 317 when selecting materials for highly corrosive chloride service. SHH STEEL provides technical support to help customers choose the most appropriate grade.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | AISI 317LM / UNS S31725 | Confirmed |
| Related Standards | ASTM A240, ASME SA240, related high-Mo specs | 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 317LM dual-certified to ASTM A240 / ASME SA240 when required by the project.
Chemical Composition
Typical Chemical Composition of AISI 317LM (UNS S31725):
| 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) | 13.00 – 17.00 |
| Molybdenum (Mo) | 4.00 – 5.00 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
The higher molybdenum content (typically 4.0–5.0%) is the key upgrade of AISI 317LM over standard 317L. Combined with extra-low carbon (≤ 0.03%), it delivers enhanced resistance to pitting and crevice corrosion in aggressive chloride environments while maintaining excellent weldability. SHH STEEL carefully controls composition to ensure consistent high-performance corrosion resistance.
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 317LM offers mechanical properties similar to other low-carbon 317 variants, with good strength, excellent ductility and toughness. SHH STEEL supplies material with consistent mechanical properties suitable for fabrication and welding in demanding corrosive service.
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 317L | 3.0–4.0 | ≤ 0.03 | Superior | Excellent | Welded aggressive chloride service |
| AISI 317LM | 4.0–5.0 | ≤ 0.03 | Higher | Excellent | More severe chloride environments |
| 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 316Ti | 2.0–3.0 | ≤ 0.08 | Better | Good (stabilized) | High-temp welded chloride service |
AISI 317LM provides a further upgrade in pitting resistance over a240 317l due to the higher molybdenum content. It bridges the gap between standard 317L and more highly alloyed grades such as a240 904l. For applications also requiring high strength, SHH STEEL recommends evaluating duplex grades such as a240 2205.
Corrosion Resistance
AISI 317LM offers excellent resistance to atmospheric corrosion, fresh water and many chemical environments. The elevated molybdenum content provides enhanced resistance to pitting and crevice corrosion in aggressive chloride-containing media compared with both 316L and standard 317L, while the low carbon content ensures excellent resistance to intergranular corrosion after welding.
It is particularly effective in chemical processing, pulp and paper, flue gas desulfurization and offshore applications where higher chloride resistance is required. In extremely aggressive conditions involving high temperatures, high chloride concentrations or strong reducing acids, more highly alloyed grades such as a240 904l or super duplex may still be necessary. SHH STEEL can assist in material selection based on the specific service environment.
Weldability
AISI 317LM has excellent weldability due to its low carbon content. Matching or appropriate higher-molybdenum filler metals are recommended. The extra-low carbon minimizes the risk of intergranular corrosion in the as-welded condition, and post-weld annealing is generally not required.
SHH STEEL recommends proper welding procedures and post-weld cleaning to achieve optimum corrosion performance in aggressive chloride service.
Heat Treatment
AISI 317LM 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 317LM 2B – most common for general fabrication |
| No.1 | Hot-rolled, annealed and pickled | AISI 317LM No.1 – industrial plate |
| BA | Bright Annealed | AISI 317LM BA – cleaner surface applications |
| No.4 | Brushed finish | AISI 317LM No.4 – architectural surfaces |
SHH STEEL regularly supplies AISI 317LM in 2B and No.1 finishes, and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances for AISI 317LM 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 317LM | — | — |
| UNS S31725 | Unified Numbering System | — |
| ASTM A240 Type 317LM | ASTM A240 | When dual certified |
| Related high-Mo 317 | EN (Europe) | Closest European grades |
| Related SUS grades | JIS (Japan) | Japanese related grades |
| Related high-Mo grades | GB/T (China) | Chinese related grades |
| Related 317L / 904L | Multiple | Lower-Mo / higher-alloy variants |
Related grades for comparison include a240 317l, a240 316l, a240 904l, a240 316, a240 2205 and a240 317.
Applications
AISI 317LM is selected for welded constructions requiring enhanced pitting and crevice corrosion resistance in aggressive chloride environments. Typical applications of AISI 317LM include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Chemical & Process Industry | AISI 317LM tanks, vessels, reactors, piping and process equipment |
| Pulp & Paper | AISI 317LM process equipment and structural parts |
| Flue Gas Desulfurization | AISI 317LM components in FGD systems |
| Pharmaceutical & Medical | AISI 317LM clean equipment, vessels and piping |
| Marine & Offshore | AISI 317LM components in aggressive chloride environments |
| Food & Beverage | AISI 317LM processing equipment in challenging conditions |
| Water Treatment | AISI 317LM tanks, filters and piping systems |
| General Fabrication | AISI 317LM welded tanks, frames and structures |
SHH STEEL supplies AISI 317LM 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 317LM 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 low-carbon material optimized for aggressive chloride service
- Flexible dimensions and surface finishes (including AISI 317LM 2B and AISI 317LM No.1)
- Technical support for selection among 317L, 317LM, 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 317LM and AISI 317L?AISI 317LM contains higher molybdenum (typically 4.0–5.0% vs 3.0–4.0%), which provides enhanced resistance to pitting and crevice corrosion in more aggressive chloride environments. SHH STEEL recommends 317LM when standard 317L is not sufficient.
- How does AISI 317LM compare with AISI 904L?Both offer high molybdenum content. 904L generally has higher nickel and copper additions and is designed for even more aggressive acid and chloride service. SHH STEEL can help determine which grade is more cost-effective for your specific environment.
- Is AISI 317LM suitable for welded constructions?Yes. The low carbon content (≤ 0.03%) provides excellent resistance to intergranular corrosion after welding. SHH STEEL recommends 317LM for most welded applications in aggressive chloride service.
- Is AISI 317LM 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 317LM?Approximately 8.00 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Can AISI 317LM replace duplex stainless steels?In many corrosive chloride environments yes, but duplex grades such as 2205 offer higher strength. SHH STEEL can help evaluate the best balance of corrosion resistance, strength and cost for your project.
- Does SHH STEEL supply dual-certified ASTM A240 / AISI 317LM material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
AISI 317LM Stainless Steel Plate is a low-carbon, higher-molybdenum austenitic grade that offers enhanced resistance to pitting and crevice corrosion compared with standard 317L. It is an excellent choice for welded chemical processing equipment, pulp and paper systems, flue gas desulfurization components, pharmaceutical equipment and offshore applications in aggressive chloride environments.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 317LM Stainless Steel Plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including AISI 317LM 2B and AISI 317LM No.1), or a competitive quotation.
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