ECoCr-E/Stellite 21 Cobalt Hardfacing & Wear-Resistant Welding Electrode

• Customization: Available
• Type: R (Surfacing Electrode)
• Material: Steel Alloy
• Diameter: 2.5mm, 3.2mm, 4.0mm, 5.0mm
• Length: 300-450mm
• Welding Core Type: Alloy Structural Steel
• Electrode Coating Type: Low Hydrogen
• Function: Surfacing Electrode, Low Hydrogen Type Electrode, Hardfacing Electrode
• Welding Power: DC
• Application: Low Carbon, Medium Carbon and Low Alloy Steel
• Transport Package: 5kg/Box, 20kg/Carton
• Specification: 3.2mm/4.0mm/5.0mm
• Trademark: TYUE
• Origin: China
• HS Code: 831110000
• Production Capacity: 20 Tons

Product Description

Co 21, cobalt based bare rod that forms a low carbon, austenitic alloy, with excellent work hardening properties, high temperature strength and impact resistant. Co 21deposits are stable during thermal cycling, making them a good choice for hot die materials. it's used on steam and fluid control valve bodies and seats. It can be applied to all weldable steels, including stainless steels. It equivalent to: Stellite 21, Polystel 21.

ECoCr-E electrodes have very good strength and ductility in temperatures up to 1600°F (871°C). Deposits are resistant to thermal shock, oxidizing, and reducing atmospheres. Early applications of these types of alloys were found in jet engine components such as turbine blades and vanes.
The deposit is a solid solution straightened alloy with a relatively low weight-percent carbide phase in the microstructure. Hence, the alloy is very tough and will work harden. Deposits possess excellent self-mated galling resistance and also are very resistant to cavitation erosion.
ECoCr-E electrodes are used where the resistance to thermal shock is important. Typical applications; similar to those of deposits made using ECoCr-A (Cobalt 6) electrodes; guide rolls, hot extrusion and forging dies, hot shear blades, tong bits, valve trim.

Applications 
Steam Valves. Hot Shears. Forging Dies. Piercing Plugs. Chemical and Petrochemical Valves.

Chemical composition:

Grade	Chemical composition(%)
	Co	Cr	W	Ni	C	Mn	Si	Mo	Fe
Co 21	Bal	27.3	≤0.5	2	0.25	≤0.5	1.5	5.5	1.5

Physical Properties

Grade	Density	Melting Point
Co 21	8.33g/cm3	1295~1435°C

Typical Characteristics:

Hardness	Abrasion Resistance	Deposit Layers	Corrosion Resistance	Machilityineab
HRC 27~40	Good	Multiple	Good	Carbide Tools

Standard Sizes:

Diameter	Diameter	Diameter
1/8" (3.2mm)	5/32" (4.0mm)	3/16" (4.8mm)

Note that special sizes, or packing requirements are available on all requests. 








 

   FAQ

 

Q: What is delivery time / lead time ?

A: 2-3 weeks.

Q: What is your minimum order ?

A: 3000kgs/each size. (MOQ for stainless steel welding electrode)

Q: Can we visit your factory ?

A: Yes. Welcome to visit our factory at any time.
Q: Can you provide free sampe ?
A: Yes. Free samples are available for you.