WCD4™ Duplex Stainless Steel
Wilfley’s WCD4™ duplex stainless steel is ideal for erosion‑corrosion applications in extremely corrosive environments.
WCD4™ is a specially processed duplex stainless steel that is chemically similar to ASTM A890 (cast material) or UNS S32550 (wrought material) but with significantly improved mechanical properties and corrosion resistance.
WCD4™ is ideal for erosion-corrosion applications in extremely corrosive environments. Pump wear parts made from WCD4™ are expected to have exceptional wear life due to its increased hardness and improved corrosion resistance.
Mechanical Properties
| Typical Hardness |
Typical Tensile Strength |
Typical Yield Strength |
Typical Elongation |
|
| Wilfley WCD4™ | 345 HBN | 164,000 psi (1,131 MPa) |
113,000 psi (779 MPa) |
16% |
| Increase over standard CD4MCu | 38% | 64% | 61% | – |
Chemical Composition (Weight %)
| C | Mn | Si | P | S | Cr | Ni | Mo | Cu | N | Fe |
| Carbon | Manganese | Silicon | Phosphorus | Sulfur | Chromium | Nickel | Molybdenum | Copper | Nitrogn | Iron |
| 0.04 max | 1.2 max | 1.0 max | 0.04 max | 0.04 max | 24.5-26.5 | 4.7-6.5 max | 1.75-3.8 | 1.5-3.25 | 0.1-0.25 | Balance |
WCD4™ vs. Standard CD4MCu
Increased Wear Life
(Sample data based on pin-on-disk testing)
Increased Corrosion Resistance
(Sample data based on testing with 65% nitric acid)
Anodic Slurry in Copper Refinery Application
The abrasive and corrosive solution was wearing through Alloy 20 (ASTM A743 Grade CN7M) pump parts at a much higher rate than desired. The customer upgraded one of the pumps to WCD4™ as a trial and couldn’t believe the results. The wear life of the pump increased from 6-8 months to over 3 years. The customer has since upgraded all of their pumps to WCD4™.
Phosphoric Acid Application
A customer who had been purchasing Wilfley chemical pumps in Illium® P (duplex stainless steel similar to CD4MCu) recently carried out a study and determined that the increased hardness of WCD4™ significantly improved the parts longevity in their pumps. The WCD4™ parts don’t just last longer, they’re also less expensive and have shorter lead times than Illium® P.
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