Rolled wire rod
US11098394B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2017 |
| Grant date | Aug 24, 2021 |
| Priority date | — |
| Expiry date | Jan 4, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/009
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A rolled wire rod wherein the contents of Ti, N, and S (mass %) are respectively [Ti], [N], and [S], and, if [S]≤0.0010, [Ti] is (4.5×[S]+3.4×[N]) or more and (0.008+3.4×[N]) or less, while if [S]≥0.0010, [Ti] is (4.5×[S]+3.4×[N]) or more and (8.0×[S]+3.4×[N]) or less, the internal structure is a mixed structure of ferrite and pearlite with an area ratio of a ferrite fraction of 40% or more, and a mean area of sulfides present in a range from a surface of the wire rod to a depth position D/8 from the surface of the wire rod is 6 μm2 or less, wherein D represents a diameter, in mm, in a cross-section of the wire rod at a plane including the axis of the wire rod, and a mean aspect ratio of the sulfides is 5 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.