WEAR-RESISTANT COBALT-BASED ALLOY AND ENGINE VALVE COATED WITH SAME

摘要

A surface hardening material being excellent in abrasion resistance and having impact resistance is provided. Provided are: a wear-resistant cobalt-based alloy containing 20.0 to 30.0 mass% of a sum of Mo and/or W, 0.8 to 2.2 mass% of B, 5.0 to 18.0 mass% of Cr, 5.0 mass% or less of a sum of Fe, Ni, Mn, Cu, Si and C, 1.0 mass% or less of Si, and 0.3 mass% or less of C, and the remainder comprising 55.0 to 70.0 mass% of Co and unavoidable impurities; and an engine valve coated with the same.