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 7001150°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/or high temperatures, 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.
Brand | Wisdom | Model Number | WD-Co21 |
Form / Shape | Powder | Dimensions | 180/53, 180/63, 150/45, 150/63, 150/53, 125/38, 250/45, 45/20, 53/20 µm |
Process | PTA, HVOF, Laser Cladding, Plasma Spray | Application | Hardfacing, Wear-resistance, Corrosion-resistance |
Equivalent | Stellite 21, BISHILITE (MHA) No.21, Weartech WT-21, Hoganas 2628-02, 2528-00 | ||
Certification | ISO 9001:2015 | Test Report | Signed & Stamped |
Free Docs | CO / GSP Form A E F P | Currency | USD/EUR/GBP/RMB |
Lead Time | Shipment within 10 days | Label | Brand, Neutral or Customized |
UNS R30021 | |
Metal to metal Wear | Excellent |
Cold / Hot Abrasion | Good / Good |
Erosion / Corrosion | Excellent / Excellent |
Impact | Excellent |
Magnetic | No |
Deposit Layers | Multiple |
Thermal Conductivity | 14.5 W/m.K, 100.5 Btu-in/hr/ft2/°F |
Electrical Resistivity | 87.38 µ-ohm.cm, 34.4 µ-ohm.inch |
Chemical Composition (%)
Co | Cr | Mo | C | Ni | Others | Hardness | Density | Melting Range |
Bal. | 26-29 | 4.5-6.0 | 0.20-0.35 | 2.0-3.0 | Fe, Si, Mn | 27-40 HRC | 8.33 g/cm3 | 1295-1435 ºC |
Forms & Grades
Bare Rod  | Grade: Co 1, 6, 12, 21, 25, 32, 190 Process: Oxy-acetylene/OAW, TIG/GTAW, ERW & other Automatic/Robotic system DIA. (mm): 2.4, 2.6, 3.2, 4.0, 4.8, 5.0, 6.4, 8.0 DIA. (inch): 3/32, 1/8, 5/32, 3/16, 1/4, 5/16 LEN. (mm): 300, 350, 450, 500, 1000, 1500, 2000, 3000, 4000
|
Powder | Grade: Co 1, 6, 12, 21, 25, 190 Process: PTA, HVOF, Laser Cladding, Plasma Spray Particle Size (µm): 180/53, 180/63, 150/45, 150/63, 150/53, 125/38, 250/45, 45/20, 53/20 Particle Size (mesh): 80/270, 80/230, 100/325, 100/230, 100/270, 120/400, 60/325, 325/635, 270/635
|
Covered/Coated/Stick Electrode | Grade: Co 1, 6, 12, 21 Process: SMAW/MMA/MMAW DIA. (mm): 2.4, 2.6, 3.2, 4.0, 4.8, 5.0 DIA. (inch): 3/32, 1/8, 5/32, 3/16 LEN. (mm): 300, 350, 450 |
Grade Color
Black: Co 1 Red: Co 6 Green: Co 12 Blue: Co 21
Quality
ISO 9001:2015 & Thorough inspection
20 years experience in production
OEM for world-class companies
Price
Most competitive price ever
Multi saving solutions
Aperiodic promotions
Service
7×24 services & Fast lead time
Free samples & Low MOQ
Various payment terms
Packing: for different forms we use different packing as pictures below
Label: Brand, Neutral or Customized
Delivery: 5 - 20 days, by Sea, Air or Express
Q1. What is your product line?
A: We specialize in hardfacing & wear-resistant welding / thermal spray consumables, with the strength of Cobalt, Nickel and Iron based alloys in form of rod, powder and electrode.
Q2. Can I have a sample order?
A: Yes, we offer FREE sample for inspection. Mixed samples are acceptable.
Q3. What about the lead time?
A: Sample needs 1-3 days, mass production needs 1-2 weeks for order quantity more than 100kgs.
Q4. Do you have any MOQ limit?
A: Low MOQ, 3-5 pcs for sample checking is available.
Q5. How do you ship the goods and how long does it take to arrive?
A: Depends on the transportation you choose. It usually takes 3 weeks to arrive by sea. Airline and Express shipping are also optional.
Q6. Do you have a fixed price list?
A: We do not. We quote based on the result we evaluate customers from various aspects, such as quantity, payment term, lead time, etc.
Q7. Is it OK to label my logo on packages?
A: Yes. Please inform us formally before the production. You could confirm the design earlier based on our sample.
Q8. How to deal with the faulty?
A: Our products are produced in strict quality control system and the defective rate will be less
than 0.1%. If you do receive items with fault, we offer 100% refund or replacement.
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