WCD4 Duplex
Stainless Steel

Wilfley Centrifugal Pumps WCD4 Duplex Stainless Steel CD4 CD4MCu CD4MCuN

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

 Wilfley
WCD4™
Increase
over standard CD4MCu
Typical
Hardness
345 HBN38%
Typical Tensile
Strength
164,000 psi
(1,131 MPa)
64%
Typical Yield
Strength
113,000 psi
(779 MPa)
61%
Typical
Elongation
20%25%

Chemical Composition (Weight %)

Carbon (C)0.04 max
Manganese (Mn)1.2 max
Silicon (Si)1.0 max
Phosphorus (P)0.04 max
Sulfur (S)0.04 max
Chromium (Cr)24.5-26.5
Nickel (Ni)4.7-6.5
Molybdenum (Mo)1.75-3.8
Copper (Cu)1.5-3.25
Nitrogen (N)0.1-0.25
Iron (Fe)Balance

WCD4™ vs. Standard CD4MCu

Increased Wear Life

(Sample data based on pin-on-disk testing)

Wilfley Centrifugal Pumps WCD4 Duplex Stainless Steel CD4 CD4MCu CD4MCuN

Increased Corrosion Resistance

(Sample data based on testing with 65% nitric acid)

Wilfley Centrifugal Pumps WCD4 Duplex Stainless Steel CD4 CD4MCu CD4MCuN

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.


View literature about WCD4™ duplex stainless steel

View articles about WCD4™ duplex stainless steel

Mark ScottWCD4™ Duplex Stainless Steel