Chisel and steel for chisel
US11186901B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | Mar 9, 2016 |
| Grant date | Nov 30, 2021 |
| Priority date | — |
| Expiry date | May 31, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2222/42
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.