Dephosphorizing flux and method for preparing same
US-2019309381-A1 · Oct 10, 2019 · US
Method for manufacturing low-phosphorus molten steel
US2023313330A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2023313330-A1 |
| Application number | US-202118022802-A |
| Country | US |
| Kind code | A1 |
| Filing date | Aug 23, 2021 |
| Priority date | Sep 10, 2020 |
| Publication date | Oct 5, 2023 |
| Grant date | — |
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Abstract
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A method for efficiently manufacturing low-phosphorus molten steel by use of a steelmaking electric furnace, in which slag resulting from melting a solid iron source is effectively separated from molten steel, and thus a unit consumption of lime required to reduce a phosphorus content in the molten steel is reduced. The method includes: charging a solid iron source and an optional molten iron source and melting and heating these raw materials by using electric energy; partly or entirely removing slag generated during the melting; performing dephosphorization by adding dephosphorization flux; and tapping low-phosphorus molten steel thus refined, and in the method, a slag composition ratio being [CaO]/([SiO 2 ]+[Al 2 O 3 ]) of the slag to be removed is adjusted to be not less than 0.25 and not more than 0.70.
First claim
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1 . A method for manufacturing low-phosphorus molten steel, wherein the method comprises: a first step of charging a solid iron source and, optionally, a molten iron source and melting and heating these raw materials by using electric energy; a second step of partly or entirely removing slag generated during the melting; a third step of, after the second step, performing dephosphorization by adding dephosphorization flux; and a fourth step of tapping low-phosphorus molten steel thus refined, and a slag composition ratio C/(S+A) of the slag to be removed in the second step is adjusted to be in a range of not less than 0.25 and not more than 0.70, where the slag composition ratio C/(S+A) is determined by dividing a CaO concentration (C) by a sum of an SiO 2 concentration (S) and an Al 2 O 3 concentration (A) on a mass basis in the slag. 2 . The method for manufacturing low-phosphorus molten steel according to claim 1 , wherein in the third step, the slag composition ratio C/(S+A) is adjusted to be in a range of not less than 0.80 and not more than 2.80. 3 . The method for manufacturing low-phosphorus molten steel according to claim 1 , wherein, in the fourth step, performing the tapping while the low-phosphorus molten steel is partly left in a furnace, and additionally charging a solid iron source and, optionally, a molten iron source so that molten steel is continuously manufactured. 4 . The method for manufacturing low-phosphorus molten steel according to claim 2 , wherein, in the fourth step, performing the tapping while the low-phosphorus molten steel is partly left in a furnace, and additionally charging a solid iron source and, optionally, a molten iron source so that molten steel is continuously manufactured.
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- What does patent US2023313330A1 cover?
- A method for efficiently manufacturing low-phosphorus molten steel by use of a steelmaking electric furnace, in which slag resulting from melting a solid iron source is effectively separated from molten steel, and thus a unit consumption of lime required to reduce a phosphorus content in the molten steel is reduced. The method includes: charging a solid iron source and an optional molten iron s…
- Who is the assignee on this patent?
- Jfe Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21C7/064. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Oct 05 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).