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PRODUCT INFORMATION: 316L MOD (EN 1.4429 / UNS S31653) STAINLESS STEEL PLATE

1. Material Designation:

• Common Names: 316L Mod, 316L Enhanced, 316LN+

• Standard Grades: EN 1.4429, UNS S31653, ASTM A240

• Also Known As: Modified 316L, Super 316L

2. Key Composition (Typical % Weight):

• Chromium (Cr): 16.5 - 18.5% (Provides basic corrosion resistance & passivation)

• Nickel (Ni): 10.0 - 13.0% (Enhances ductility, toughness & corrosion resistance)

• Molybdenum (Mo): 2.7 - 3.3% (Significantly boosts resistance to pitting & crevice corrosion, higher than standard 316L)

• Manganese (Mn): ≤ 2.0%

• Silicon (Si): ≤ 0.75%

• Nitrogen (N): 0.10 - 0.16% (Increases strength & further enhances pitting resistance)

• Carbon (C): ≤ 0.030% (Low carbon minimizes sensitization/weld decay)

• Phosphorus (P): ≤ 0.045%

• Sulfur (S): ≤ 0.030%

• Iron (Fe): Balance

3. Superior Properties:

• Enhanced Corrosion Resistance: Significantly outperforms standard 316L, especially in aggressive chloride-containing environments (seawater, chemical processing, coastal areas). Excellent resistance to pitting and crevice corrosion.

• Pitting Resistance Equivalent (PRE): PRE > 34 (Calculated as %Cr + 3.3x%Mo + 16x%N), indicating superior performance vs. standard 316L (PRE ~26).

• Good Weldability: Low carbon content minimizes carbide precipitation in the heat-affected zone (HAZ), making it suitable for welding without post-weld annealing in most cases. Standard austenitic SS welding procedures apply.

• High Strength: Nitrogen addition provides higher yield and tensile strength compared to standard 316L while maintaining good ductility.

• Excellent Formability & Toughness: Maintains the good fabrication characteristics of austenitic stainless steels.

• Good High-Temperature Performance: Suitable for moderate elevated temperature service.

4. Primary Applications (Where superior corrosion resistance is critical):

• Offshore & Marine Equipment (platforms, piping, seawater handling)

• Chemical & Petrochemical Processing (vessels, heat exchangers, piping)

• Desalination Plants (evaporators, RO units)

• Pulp & Paper Industry (bleach plants)

• Flue Gas Desulfurization (FGD) Systems

• Pharmaceutical & Food Processing Equipment

• Coastal Architecture & Structural Applications

• Heat Exchangers (tubing, shells - especially with cooling water)

• Pollution Control Equipment

5. Available Forms & Specifications:

• Form: Plate (Hot Rolled or Cold Rolled)

• Thickness Range: Typically 3.0mm (0.125") up to 100mm (4") or more (subject to mill capability)

• Width Range: Up to 2000mm (78") or more (subject to mill capability)

• Length Range: Up to 6000mm (20ft) or more (subject to mill capability). Cut-to-length available.

• Standards: Compliant with ASTM A240/A240M, EN 10088-2, ASME SA-240, etc. Certificates (EN 10204 3.1/3.2) available.

• Surface Finish: Standard Mill Finish (No. 1, 2B), Brushed (No. 4), Polished (e.g., BA, Mirror), as required. Pickled & Passivated standard.

6. Physical Properties (Typical):

• Density: 7.98 g/cm³ (0.288 lb/in³)

• Melting Range: ~1390 - 1440 °C (~2534 - 2624 °F)

• Modulus of Elasticity: 200 GPa (29 x 10^6 psi)

• Thermal Expansion: 16.0 μm/m·°C (8.9 μin/in·°F) @ 20-100°C

• Thermal Conductivity: 15 W/m·K @ 100°C

• Electrical Resistivity: 0.74 μΩ·m

• Magnetic Properties: Essentially non-magnetic when annealed (low permeability).

7. Key Advantages vs. Standard 316L:

• Higher Molybdenum (Mo): Directly increases resistance to chloride pitting/crevice corrosion.

• Controlled Nitrogen (N) Addition: Boosts strength and further enhances pitting resistance (synergy with Mo).

• Higher PRE Number: Quantifiably superior corrosion performance.

• Maintains Fabricability: Similar weldability and formability to 316L.

8. Availability:

• Stocked in various thicknesses, widths, and lengths.

• Custom cutting, forming, and machining services often available.

• Contact us for specific size inquiries, pricing, and material certification details.