Free-cutting steel and manufacturing method thereof
US12404573B2 · kind B2 · utility
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Key dates
| Filing date | Dec 23, 2020 |
| Grant date | Sep 2, 2025 |
| Priority date | — |
| Expiry date | Jul 18, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B2001/022
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Free-cutting steel includes a specific composition, with an A value defined by a following formula (1) satisfying 4.0 or more and 20.0 or less, and remainder having Fe and an unavoidable impurity; and texture with 1000 or more sulfide particles with an equivalent circle diameter of less than 1 μm per mm2, 500 or more sulfide particles with an equivalent circle diameter of 1 μm or more and 5 μm or less per mm2, and 1000 or more Pb particles with an equivalent circle diameter of 1 μm or less per mm2, wherein A value=(Mn+5Cr)/S (1)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.