Cobalt Based Stellite 21 Welding Rod
OXY Or TIG
Introduction of Cobalt Based Stellite 21 Welding Rod:
Global Fusion Co21 is equivalent to Stellite 21, a corrosion resistant CoCr alloy, 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