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US 12,760,396 B2Granted
Slab having exceptional surface crack resistance and continuous casting method thereof
AssigneeNippon Steel Corporation
InventorsShin Takaya, Yuichiro Kato, Kenji Taguchi
Life of this patent
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Abstract
This slab is a slab of high-Al steel containing C: 0.02 mass % to 0.50 mass % and Al: 0.20 mass % to 2.00 mass %, in which, in a case where [Zr], [Al], and [N] each represent a content (mass %) in the slab, a Zr content satisfies a relationship of [Zr]≥4/3×[Al]×[N].
Claims6
A slab of high-Al steel comprising:
- C:
- 0.02 mass % to 0.50 mass %;
- and
- Al:
- 0.20 mass % to 2.00 mass %,
- wherein a Zr content satisfies the following formula (1),
- [
- Zr
- ]
- ≥
- 4
- /
- 3
- ×
- [
- Al
- ]
- ×
- [
- N
- ]
- formula
-
- (
- l
- )
- here, [Zr], [Al], and [N] each represent a content, in mass %, in the slab, and
- wherein a mass ratio of ZrN in all nitrides with a circle equivalent diameter of 200 to 5000 nm in a surface layer area of the slab is 60.0 mass % or more.
25 more elements
Dependencies are inferred from the claim text.