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                WD-Co21

                PRODUCT

                Introduction

                WD-Co21 (previously known as WD-Co8) was developed in the mid 1930s as a corrosion resistant CoCr alloy, and rapidly found application as a biocompatible hip implant and denture alloy. Many of the alloys currently used in medical applications are variants of the original WD-Co21 composition. It was also one of the first heat-resistant alloys trialled for use in jet engines.

                WD-Co21 consists of a CoCrMo alloy matrix containing dispersed hard carbides which strengthen the alloy and increase its hardness, but also decrease the ductility. The type, shape, size, and distribution of the carbides is strongly influenced by the processing history of the alloy, and for this reason the mechanical properties of WD-Co21 are very dependent upon the manufacturing route and any subsequent heat treatments.

                Due to the low volume fraction of carbides, the Co-based alloy matrix dominates the wear and corrosion properties. WD-Co21 has excellent cavitation, galling and metal-to-metal sliding wear resistance, but is not recommended for severe hard particle abrasion. The surface can work harden considerably during wear or even during machining, and the use of correct machining tools and techniques is important to achieve optimal results.

                WD-Co21 has excellent resistance to thermal and mechanical shock. Optimum high temperature strength is obtained by solution heat treatments at 1200-1240ºC (2190 - 2265ºF) followed by quenching, and aging in the temperature range 700-1150°C (1290-2100°F).

                WD-Co21 can be cast, powder metallurgically processed, or applied as a weld hardfacing. It is recommended for applications involving cavitation, erosion, corrosion and high temperature, such as valve trim for petrochemical and power generation. Due to its good impact resistance, it has been widely used in the building up of forging or hot stamping dies. The oxyacetylene weld deposition method is not recommended for this alloy.

                Common Name: Stellite® 21, Polystel® 21

                Chemical Composition(%)

                C

                Si

                Mn

                Mo

                Cr

                W

                Ni

                Fe

                Co

                Others

                0.2

                2.0

                ≤1.0

                5.5

                28.0

                0.2

                ≤3.0

                2.0

                Bal

                <1.0

                Deposit Characteristic

                Abrasion Resistance

                Moderate

                Impact Resistance

                Excellent

                Corrosion Resistance  

                Good

                Hardness

                HRC 20-40

                Deposit Layers

                Multiple

                Deposit Cross Checks

                No

                Magnetic  

                No

                Hot Wear Hardness  

                Good

                Machinability

                Carbide Tools

                Particle size (µm)

                180/53, 180/63, 150/45, 150/63, 150/53, 125/38, 250/45, 45/20, 53/20

                Other forms

                Rod, Electrode

                PRODUCTION PROCESS

                Smelting

                Pour molten steel

                Gas atomization

                Collection

                Screening

                Polish, Griding

                Mixing

                WELDING PROCESS

                Plasma Transferred Arc

                Laser Cladding

                Spray Fuse

                HVOF

                APPLICATION

                Valve

                valve mill screw

                High Pressure & Temperature Valves, Valve Seats

                Chemical & Petrochemical valves, Steam valves

                Cutting

                hot shear

                Impeller

                Pump Impellers

                Rings

                Dies

                Hot forging dies

                Hot Trimming & Forging Dies

                Others

                Cavitation Repair

                PACKING & SHIPPING

                Label

                Brand, Neutral or Customized

                Lead time

                7-10 working days

                Delivery

                Courier:3 - 5 days

                Air        :5 - 7 days

                Sea      :30 - 50 days

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