STEEL FOR CHISELS AND CHISEL

摘要

The present invention provides a steel for chisels and a chisel, which have improved durability. The steel that constitutes the chisel (10) according to the present invention is characterized by comprising 0.40-0.45 mass% carbon, 0.50-0.80 mass% silicon, 1.00-1.30 mass% manganese, 0.001-0.005 mass% sulfur, 2.90-3.80 mass% chromium, and 0.20-0.40 mass% molybdenum, with the remainder being composed of iron and unavoidable impurities; and by the ideal critical diameter DI, as defined in formula (1), being 600 or greater. DI = 7・(%C)1/2・(1 + 0.64・%Si)・(1 + 4.1・%Mn)・(1 + 2.83・%P) ・(1 – 0.62・%S) ・(1 + 2.33・%Cr) ・(1 + 3.14・%Mo)