SS 316L Cathode

High-Purity Stainless Steel Cathode for Stable and Efficient Copper Electrowinning

The 316L stainless steel cathode is a conventional and widely used permanent cathode type in copper electrowinning and electrorefining processes. Made from 316L austenitic stainless steel, it provides good corrosion resistance in sulfuric acid electrolyte environments, with mature manufacturing technology and stable supply chain.

As the most common stainless steel cathode grade, 316L is a reliable choice for medium and small capacity tankhouses, conventional electrolyte conditions and projects with moderate budget. It balances performance and cost well for standard copper electrolysis applications.

316L (UNS S31603) is a molybdenum-bearing austenitic stainless steel. The "L" denotes low carbon content, which reduces the risk of carbide precipitation during welding and improves intergranular corrosion resistance.

Main alloying elements:

• Chromium (16–18.5%): Basic corrosion resistance
• Nickel (10–14%): Austenite stabilization, improves toughness
• Molybdenum (2–3%): Enhances pitting and crevice corrosion resistance
• Low carbon (≤ 0.03%): Improved weld corrosion resistance

Typical mechanical properties:

• Tensile strength: ≥ 485 MPa
• Yield strength: ≥ 170 MPa
• Pitting Resistance Equivalent (PREN): ~24
• Good formability and weldability

A standard 316L stainless steel cathode assembly includes:

• 316L Stainless Steel Plate Precision-cut plate with polished deposition surface. The low-carbon grade ensures good corrosion resistance even after welding the conductive beam.
• Composite Conductive Beam Copper core for high electrical conductivity, clad with 316L stainless steel for corrosion protection. The joint between beam and plate is welded and sealed to prevent electrolyte infiltration.
• Hanging Lugs Positioned to match standard cell busbar spacing, with contact surfaces machined flat for good electrical contact.
• Edge Insulation Polypropylene insulation strips bonded to side edges and bottom edge, preventing copper deposition on edges and making stripping easier. See How to Install and Remove the Edge Strip.
   

• Mature and Reliable
  316L stainless steel has been used as cathode material for decades, with proven performance in copper electrolysis applications. Manufacturing technology is mature and product quality is stable.
• Good Corrosion Resistance for Conventional Conditions
  The addition of molybdenum gives 316L better pitting corrosion resistance than 304 stainless steel, making it suitable for most conventional sulfuric acid electrolyte environments with low chloride content.
• Easy Processing and Maintenance
  Good formability and weldability make 316L cathodes easy to manufacture and repair. Local damage can often be repaired on site by grinding and polishing.
• Moderate Cost
  As a standard industrial material, 316L stainless steel has stable supply and moderate price. It is more economical than duplex steel or titanium cathodes, suitable for projects with limited budget.
• Wide Application Base
  Most traditional copper electrolysis plants use 316L or similar stainless steel cathodes. Operators and maintenance personnel are usually familiar with this material, reducing training and adaptation costs.

316L stainless steel cathode is recommended when:

• Your electrolyte has low chloride ion content and standard composition
• You operate at conventional current density (200–300 A/m²)
• You have a medium or small production scale

Budget is a primary consideration and you want a proven, reliable solution

You are replacing existing 316L cathodes and want to maintain consistency

If you need longer service life or operate at higher current density, consider upgrading to LDX 2101 or 2205 duplex steel cathodes.

For detailed comparison between 316L and LDX 2101, see: 316L vs LDX 2101: Which Cathode Material is Better?

• Medium and small copper electrowinning tankhouses
• Conventional copper electrorefining plants
• Projects with standard sulfuric acid electrolyte
• Budget-sensitive capacity expansion projects
• Replacement of existing 316L cathode fleets

Our After-Sales Service

 Material Consistency: Some suppliers use non-standard stainless steel or inconsistent flatness, leading to increased stripping failures or short circuiting.

 Welding Precision: Improper welding methods can result in conductive misalignment, affecting overall current efficiency.

 Surface Flatness Control: Uneven surfaces increase stripping difficulty and copper loss; PRS ensures strict flatness ≤ 3 mm.

 Custom Sizing: Clients often struggle to find suppliers offering accurate customization for specific tank sizes and current densities.

We help solve these pain points through rigorous QC procedures, CAD-assisted custom design, and full documentation support.

PRS SS 316L Cathodes are securely fixed within steel frame packaging to prevent vibration or impact during transit. Each bundle is covered with moisture-proof film and labeled with a unique product ID for easy tracking. Export-standard packaging ensures safety and compliance for sea, land, or air shipment.

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