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US 12,599,957 B2Granted
Slab and continuous casting method thereof
AssigneeNippon Steel Corporation
InventorsShin Takaya, Kenji Taguchi, Yuichiro Kato
Life of this patent
Estimating the term…
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], [Ti], [Al], and [N] each represent a content (mass %) in the slab, a Zr content and a Ti content satisfy a relationship of [Zr]+0.2×[Ti]≥4/3×[Al]×[N], and the Zr content satisfies a relationship of 0.0010 mass %≤[Zr].
Claims12
A slab of high-Al steel comprising:
- C:
- 0.02 mass % to 0.50 mass %;
- Si:
- 0.20 mass % to 3.00 mass %;
- Mn:
- 0.50 mass % to 4.00 mass %;
- Nb:
- 0% to 0.1%;
- V:
- 0% to 0.1%;
- B:
- 0% to 0.005%;
- Cr:
- 0% to 0.1%;
- Ni:
- 0% to 0.5%;
- Cu:
- 0% to 0.5%;
- Ti:
- 0.0020% to 0.5%;
- and
- Al:
- 0.20 mass % to 2.00 mass %,
- wherein a Zr content and a Ti content satisfy the following formula (1), and the Zr content satisfies the following formula (2),
- [Zr]+0.2×[Ti]≥4/3×[Al]×[N] formula (1)
- 0.0010 mass %≤[Zr] formula (2)
- here, [Zr], [Ti], [Al], and [N] each represent a content, in mass %, in the slab, and
- wherein a mass ratio of (Zr,Ti) N in all nitrides in a surface layer area of the slab is 50.0 mass % or more.
25 more elements
A slab of high-Al steel comprising:
- C:
- 0.02 mass % to 0.50 mass %;
- Si:
- 0.20 mass % to 3.00 mass %;
- Mn:
- 0.50 mass % to 4.00 mass %;
- Nb:
- 0% to 0.1%;
- V:
- 0% to 0.1%;
- B:
- 0% to 0.005%;
- Cr:
- 0% to 0.1%;
- Ni:
- 0% to 0.5%;
- Cu:
- 0% to 0.5%;
- Ti:
- 0.0020% to 0.5%;
- and
- Al:
- 0.20 mass % to 2.00 mass %,
- wherein a Zr content and a Ti content satisfy the following formula (1), and the Zr content satisfies the following formula (2),
- [Zr]+0.2×[Ti]≥4/3×[Al]×[N] formula (1)
- 0.0010 mass %≤[Zr] formula (2)
- here, [Zr], [Ti], [Al], and [N] each represent a content, in mass %, in the slab,
- wherein the following formula (3) is further satisfied,
- [Ti]/[Zr]≥1, formula (3) and
- wherein a mass ratio of (Zr,Ti) N in all nitrides in a surface layer area of the slab is 50.0 mass % or more.
27 more elements
A slab of high-Al steel comprising:
- C:
- 0.02 mass % to 0.50 mass %;
- Si:
- 0.20 mass % to 3.00 mass %;
- Mn:
- 0.5 mass % to 4.00 mass %;
- Nb:
- 0% to 0.1%;
- V:
- 0% to 0.1%;
- B:
- 0% to 0.005%;
- Cr:
- 0% to 0.1%;
- Ni:
- 0% to 0.5%;
- Cu:
- 0% to 0.5%;
- Ti:
- 0.0020% to 0.5%;
- Al:
- 0.20 mass % to 2.00 mass %,
- wherein a Zr content and a Ti content satisfy the following formula (1), and the Zr content satisfies the following formula (2),
- [Zr]+0.2×[Ti]≥4/3×[Al]×[N] formula (1)
- 0.0010 mass %≤[Zr] formula (2)
- here, [Zr], [Ti], [Al], and [N] each represent a content, in mass %, in the slab,
- wherein a mass ratio of (Zr,Ti) N in all nitrides in a surface layer area of the slab is 50.0 mass % or more.
24 more elements
A slab of high-Al steel comprising:
- C:
- 0.02 mass % to 0.50 mass %;
- Si:
- 0.20 mass % to 3.00 mass %;
- Mn:
- 0.5 mass % to 4.00 mass %;
- Nb:
- 0% to 0.1%;
- V:
- 0% to 0.1%;
- B:
- 0% to 0.005%;
- Cr:
- 0% to 0.1%;
- Ni:
- 0% to 0.5%;
- Cu:
- 0% to 0.5%;
- Ti:
- 0.0020% to 0.5%;
- Al:
- 0.20 mass % to 2.00 mass %,
- wherein a Zr content and a Ti content satisfy the following formula (1), and the Zr content satisfies the following formula (2),
- [Zr]+0.2×[Ti]≥4/3×[Al]×[N] formula (1)
- 0.0010 mass %≤[Zr] formula (2)
- here, [Zr], [Ti], [Al], and [N] each represent a content, in mass %, in the slab,
- wherein the following formula (3) is further satisfied,
- [Ti]/[Zr]≥1, formula (3) and
- wherein a mass ratio of (Zr,Ti) N in all nitrides in a surface layer area of the slab is 50.0 mass % or more.
26 more elements
Dependencies are inferred from the claim text.