Chisel and steel for chisel
AssigneeKomatsu Ltd.
InventorsEiji AMADA, Akihiro OCHIAI, Norimasa TSUNEKAGE, Yuko NAGAKI
Life of this patent
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Abstract
A steel constituting a chisel according to the present invention includes: 0.40-0.45% by mass of carbon, 0.50-0.80% by mass of silicon, 1.00-1.30% by mass of manganese, 0.001-0.005% by mass of sulfur, 2.90-3.80% by mass of chromium, and 0.20-0.40% by mass of molybdenum, with a balance consisting of iron and an unavoidable impurity, the steel has an ideal critical diameter DI defined by Equation (1) of 600 or more: 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) (1).
Claims6
A steel for a chisel to be used as a material constituting a chisel, the steel containing:
- 0.40% by mass or more and 0.45% by mass or less of carbon, 0.50% by mass or more and 0.80% by mass or less of silicon, 1.00% by mass or more and 1.30% by mass or less of manganese, 0.001% by mass or more and 0.005% by mass or less of sulfur, 2.90% by mass or more and 3.80% by mass or less of chromium, and 0.20% by mass or more and 0.40% by mass or less of molybdenum, with a balance consisting of iron and an unavoidable impurity, and
- the steel having an ideal critical diameter DI defined by Equation (1) of 600 or more:
- 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) (1).
A chisel constituted by a steel containing:
- 0.40% by mass or more and 0.45% by mass or less of carbon, 0.50% by mass or more and 0.80% by mass or less of silicon, 1.00% by mass or more and 1.30% by mass or less of manganese, 0.001% by mass or more and 0.005% by mass or less of sulfur, 2.90% by mass or more and 3.80% by mass or less of chromium, and 0.20% by mass or more and 0.40% by mass or less of molybdenum, with a balance consisting of iron and an unavoidable impurity, and
- the steel having an ideal critical diameter DI defined by Equation (1) of 600 or more:
- 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) (1).
Dependencies are inferred from the claim text.