AWS A5.13 ECoCr-A

Cobalt 6

ECoCr-A electrodes are characterized by a hypoeutectic structure, consisting of a network of about 13% eutectic chromium carbides distributed in a cobalt-chromium-tungsten solid solution matrix. The result is a material with a combination of overall resistance to low stress abrasive wear, with the necessary toughness to resist some degree of impact. Cobalt alloys also are inherently good for resisting metal-to-metal wear, particularly in high load situations that are prone to galling. The high-alloy content of the matrix also affords excellent resistance to corrosion, oxidation, and elevated temperature retention of hot hardness up to a maximum of 1200°F (650°C). These alloys are not subject to allotropic transformation and therefore do not lose their properties if the base metal is subsequently heat treated.

Colbalt #6 is recommended for cases where wear is accompanied by elevated temperatures and where corrosion is involved, or both. Some typical applications are automotive and fluid flow valves, chain saw guides, hot punches, shear blades, and extruder screws.

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