A R Wilfley India Pvt. Ltd.

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

Tensile Strength
Yield Strength
Wilfley WCD4™ 345 HBN 164,000 psi
(1,131 MPa)
113,000 psi
(779 MPa)
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™.

Anodic Slurry

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.

Anodic Slurry

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