Cold-rolled steel sheet for vitreous enameling and its named enameled product thereof
US10011888B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2014 |
| Grant date | Jul 3, 2018 |
| Priority date | — |
| Expiry date | Jul 28, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/005
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A cold-rolled steel sheet for vitreous enameling has a predetermined chemical composition, in which a number density of Fe—Mn—Nb-based composite oxides having a diameter of 0.2 μm to 10 μm is 2×102 particle/mm2 to 1×104 particle/mm2; a fatigue limit ratio is higher than 0.42 after performing a heat treatment with an applied tensile strain of 10% at a heating temperature of 830° C. for a holding time of 5 minutes; voids are formed between the metallographic structure and the Fe—Mn—Nb-based composite oxides, and an equivalent circle diameter of the voids is 0.1 μm to 0.6 μm; and when each of the voids is approximated as a triangle and a long side of the triangle is set as a base, a value obtained by dividing a length of the base by a height of the triangle is 1.0 to 15.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.