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WT-21 Weartech Cobalt Base Alloys Hardfacing Welding Electrode (same as STELLITE® 21).

WT-21 Weartech Cobalt Base Alloys Hardfacing Welding Electrode (same as STELLITE® 21).

WT-21 Coated Welding Electrode is a low carbon, molybdenum strengthened, cobalt chromium alloy.
Description / Applications:
This Coated Welding Electrode is recommended for metal-to-metal abrasion and high impact applications involving high temperatures and/or corrosive media.
WT-21 Coated Welding Electrode, has excellent resistance to thermal and mechanical shock.
It is resistant to oxidizing and reducing atmospheres up to 1150° C.
The excellent high temperature strength is maintained through aging in the temperature range 700° C-1150° C.
WT-21 Coated Welding Electrode is recommended for applications involving erosion, high temperatures and corrosion, e.g. oil and petrochemical applications, trim valve for high pressure steam, valves of all kinds, shear blades, hot punches and saw guides.
As a welded deposit, it is widely used in the building up of forging or hot stamping dies, due to its good impact resistance.
Its inherent resistance to galling (under self-mated conditions), cavitation erosion, and corrosion resistance has made it a popular fluid valve seat facing alloy.
The deposits retain wear resistance at high temperatures.
WT-21 bonds well with weldable alloy steels, including stainless.
This alloy is non magnetic and is not forgeable.

Typical Chemical Analysis %:
C 0.25, Cr 27, Co bal, Ni 2.5, Fe <3, Si <1, Mo 5.0.

Typical Mechanical Properties:
Typical Hardness: 32 Rockwell C

Note: The typical hardness values listed above are for multilayer welds. Hardness values for single deposits will be lower because of dilution from the base metal.

Available diameter: 2.4 - 3.2 - 4.0 mm, other diam. on request.

AWS 5.13 ECOCR-E - UNS W73021
Chemical analysis
Element Value
C 0,25
Cr 27,00
Co Bal.
Ni 2,5
Fe < 3
Si 1,0 max
Mo 5,0
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