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Cobalt Based Stellite 21 Welding Rod

Cobalt Based Stellite 21 Welding Rod

Cobalt Based Stellite 21 Welding Rod Specifications: Introduction of Cobalt Based Stellite 21 Welding Rod: Global Fusion 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...

Cobalt Based Stellite 21 Welding Rod
Specifications:

Alloy Family

Powder

HRC

Chemical Composition

Process  

Diameter

C

Cr

Si

W

Fe

Mo

Ni

Co

Mn

B

Cobalt

Co21

20

0.25

27

1

0.15

2

5.5

2.5

Bal

1

 

OXY Or TIG

Ø3.2,4.0,4.8


Introduction of Cobalt Based Stellite 21 Welding Rod:
Global Fusion 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 trialed for use in jet engines.


Global Fusion 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 Global Fusion-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. Global Fyusion-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.


Global Fusion-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).


Global Fusion-Co 21 can be cast, powder metallurgy 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.


Characteristic of Global Fusion Stellite 21 welding rod,
1. High hardness & hot hardness
2. Excellenthigh-temperature strength
3. Excellent thermal fatigueresistance
4. Trermal shock resistance
5. Resistant to antioxidant,corrosion ,grain abrasion

Modern testing Centre and Equipment

America ThermoFisher ICAP6300  Mastersizer3000

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United Kingdom Marlvin

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LECO CS-230  Carbon/Sulphur Analyzer                                   

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TC400C

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Principle of Four-Step Inspection to Control Quality

First Step: Raw Material Inspection before Storage 

Second Step: Accuracy of Burdening Inspection

Third Step: On-the-Spot Sample Inspection and Inspection after Soldering

Finished Product Inspection: Finished Product Inspection

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Four No-Passing Principles for Unqualified Products

No-Passing of Unclear Reasons 

No-Passing of Vague Responsibilities 

No-Passing of Unimplemented Education and Treatment 

No-Passing of Unimplemented Corrective and Preventive Action



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About Delivery and shipping                                 

 

1. For the products which we have raw material in stock.

               

We can deliver the products within 7-10 days after the payment has been confirmed.

 

We will choose the shipping way as you required: By sea, by air, by express, etc.

 

As for the costs and shipping period information, please contact us via telephone, mail or online trade manager.

 

2.For the products need to start from smelting

                

We will finish the production within 20-25 days after the deposit has been confirmed. We will choose the shipping way as you required:  By sea, by air, by express, etc.

 

As for the costs and shipping period information, please contact us via telephone, mail or online trade manager.


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