AWS A5.21 ERCoCr-C

Cobalt 1

ERCoCr-C has a higher percentage (approximately 19%) of carbides than deposits made using either ERCoCr-A (Cobalt 6) or ERCoCr-B (Cobalt 12). In fact, the composition, is such that primary hypereutectic carbides are found in the microstructure. This characteristic gives the alloy higher wear resistance accompanied by reductions in the impact and corrosion resistance. The higher hardness also means a greater tendency may be minimized by closely monitoring preheating, interpass temperature, and postheating techniques.

While the cobalt-chromium deposits soften somewhat at elevated temperatures, they normally are considered immune to tempering. ERCoCr-C electrodes and rods is used to build-up items such as mixers, rotors or wherever harsh abrasion and low impact are encountered.