Heat-rolled steel plate for tailored rolled blank, tailored rolled blank, and methods for producing these
US10329637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2015 |
| Grant date | Jun 25, 2019 |
| Priority date | — |
| Expiry date | Apr 26, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A heat-rolled steel plate has a chemical composition that contains, in mass %, C, Si, Mn, P, S, Al, N and Ti, and that satisfies Formula (1); and a microstructure containing bainite and ferrite. In the interior of the steel plate an average value of pole densities of an orientation group {100}<011> to {223}<110> is 4 or less, and a pole density of a {332}<113> crystal orientation is 4.8 or less. In an outer layer of the steel plate, a pole density of a {110}<001> crystal orientation is 2.5 or more. Furthermore, among Ti carbo-nitrides in the steel plate, the number density of fine Ti carbo-nitrides having a particle diameter of 10 nm or less is 1.0×1017 per cm3 or less, and a bake hardening amount is 15 MPa or more. [Ti]−48/14×[N]−48/32×[S]≥0 (1)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.