High tensile strength hot-rolled steel sheet and method for manufacturing the same
US6632295B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 2001 |
| Grant date | Oct 14, 2003 |
| Priority date | — |
| Expiry date | Jul 12, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high tensile strength hot-rolled steel sheet comprises 0.04 to 0.09% C, 0.1% or less Si, 0.5 to 1.5% Mn, 0.02% or less P, 0.01% or less S, 0.1% or less Al, 0.001 to 0.008% N, and 0.01 to 0.15% Ti, by mass %, the content of ingredient there each satisfying the equation (1), and the ferritic grain size &agr; (&mgr;m) satisfying the equation (2):[C]+7×[Si]+0.1×[Mn]+[P]+14×[S]+1.75×[Al]+23×[N]+[Ti]+18×[O]+7×[Cu]+18×[Sn]+7×[Mo]+1.7×[Cr]+70×[B]+7×[Ca]+14×[Zr]+14×[V]+7×[Nb]≦2  (1)3≦&agr;≦60×[Ti]+8  (2)where, [X] denotes the content (mass %) of element X. This hot-rolled steel sheet has excellent workability, high magnetic permeability and high magnetic flux density in a strong magnetic field, and has 490 MPa or higher strength, and is suitable for large electric equipment such as a rotor of generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.