Stellite 21 Welding Electrode - Cobalt Based Alloy

• Customization: Available
• Equivalent: Stellite 21, Bishilite(Mha) No.21, Weartech Wt-21
• Material: Cobalt Based Alloy
• Model NO.: WD-Co21
• Shape: Covered/Coated/Stick Electrode
• Aws / ASME: A5.13 / Sfa5.13 Ecocr-E
• Hardness (HRC): 27-40
• Process: Smaw/MMA/Mmaw
• Application: Hardfacing, Wear-Resistance, Corrosion-Resistance
• Transport Package: Carton, Plywood Case
• Specification: DIA. 2.4, 2.6, 3.2, 4.0, 4.8, 5.0 mm
• Trademark: Wisdom
• Origin: Shanghai
• Production Capacity: 5000 Ton/Year

Product Description

Product Description

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 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	Electrode	Dimensions	DIA. 2.4, 2.6, 3.2, 4.0, 4.8, 5.0 mm
Process	SMAW/MMA/MMAW	Application	Hardfacing, Wear-resistance, Corrosion-resistance
Equivalent	Stellite 21, BISHILITE (MHA) No.21, Weartech WT-21
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

Specification

 

AWS / ASME: A5.13 / SFA5.13 ECoCr-E
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


 

 

 

Advantages

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

Certifications

 

 

 

Applications

 

 

 

 

Packing & Delivery

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

 

FAQ

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.