BR112023024464A2 - METHOD FOR REFINED CAST IRON - Google Patents
METHOD FOR REFINED CAST IRONInfo
- Publication number
- BR112023024464A2 BR112023024464A2 BR112023024464A BR112023024464A BR112023024464A2 BR 112023024464 A2 BR112023024464 A2 BR 112023024464A2 BR 112023024464 A BR112023024464 A BR 112023024464A BR 112023024464 A BR112023024464 A BR 112023024464A BR 112023024464 A2 BR112023024464 A2 BR 112023024464A2
- Authority
- BR
- Brazil
- Prior art keywords
- cast iron
- iron
- untreated
- mass
- decarburization
- Prior art date
Links
- 229910001018 Cast iron Inorganic materials 0.000 title abstract 13
- 238000000034 method Methods 0.000 title abstract 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 9
- 229910052742 iron Inorganic materials 0.000 abstract 4
- 238000005261 decarburization Methods 0.000 abstract 3
- 238000002844 melting Methods 0.000 abstract 3
- 230000008018 melting Effects 0.000 abstract 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract 3
- 238000007670 refining Methods 0.000 abstract 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 2
- 229910052799 carbon Inorganic materials 0.000 abstract 2
- 239000007789 gas Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 229910000805 Pig iron Inorganic materials 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- 229930195733 hydrocarbon Natural products 0.000 abstract 1
- 150000002430 hydrocarbons Chemical class 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 238000009849 vacuum degassing Methods 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/04—Removing impurities other than carbon, phosphorus or sulfur
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
método para refinar ferro fundido. é proposto um método para refinar ferro fundido que possa produzir de forma estável aço de baixo nitrogênio. neste método para refinar ferro fundido, ferro fundido não tratado com uma concentração de carbono [c]i entre 0,5% em massa e 3,0% em massa, ambos inclusos, é colocado em um recipiente, e oxigênio é soprado no ferro fundido não tratado sob pressão atmosférica enquanto um gás hidrogênio, um gás hidrocarboneto ou um gás de mistura desses gases é soprado nele para realizar um tratamento de descarbonetação e desnitrificação do ferro fundido não tratado. é preferencial, por exemplo, que uma concentração de nitrogênio [n]f no ferro fundido tratado após ser submetido ao tratamento de descarbonetação e desnitrificação seja de 30 ppm em massa ou inferior; que o ferro fundido tratado após ser submetido ao tratamento de descarbonetação e desnitrificação seja submetido adicionalmente a um tratamento de desgaseificação a vácuo; que o ferro fundido não tratado inclua ferro fundido obtido pela fusão de uma fonte de ferro frio; que o ferro fundido não tratado seja uma mistura de ferro fundido primário obtido pela fusão de uma fonte de ferro frio em um forno de fusão e ferro-gusa fundido tendo uma concentração de carbono de 2,0% em massa ou mais alta; que a fonte de ferro frio inclua ferro reduzido; e que o recipiente seja um conversor.method for refining cast iron. A method for refining cast iron that can stably produce low-nitrogen steel is proposed. In this method for refining cast iron, untreated cast iron with a carbon concentration [c]i between 0.5% by mass and 3.0% by mass, both included, is placed in a vessel, and oxygen is blown into the iron untreated cast iron under atmospheric pressure while a hydrogen gas, a hydrocarbon gas or a mixture of these gases is blown into it to carry out a decarburization and denitrification treatment of the untreated cast iron. It is preferred, for example, that a concentration of nitrogen [n]f in the treated cast iron after being subjected to decarburization and denitrification treatment is 30 ppm by mass or lower; that cast iron treated after undergoing decarburization and denitrification treatment is additionally subjected to vacuum degassing treatment; that untreated cast iron includes cast iron obtained by melting a cold iron source; that untreated cast iron is a mixture of primary cast iron obtained by melting a cold iron source in a melting furnace and molten pig iron having a carbon concentration of 2.0% by mass or higher; that the source of cold iron includes reduced iron; and that the container is a converter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021088031 | 2021-05-26 | ||
| PCT/JP2022/018168 WO2022249798A1 (en) | 2021-05-26 | 2022-04-19 | Method for refining molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BR112023024464A2 true BR112023024464A2 (en) | 2024-02-06 |
Family
ID=84229902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR112023024464A BR112023024464A2 (en) | 2021-05-26 | 2022-04-19 | METHOD FOR REFINED CAST IRON |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP4328330A1 (en) |
| JP (1) | JP7384294B2 (en) |
| KR (1) | KR20230162108A (en) |
| CN (1) | CN117377781A (en) |
| BR (1) | BR112023024464A2 (en) |
| TW (1) | TWI817507B (en) |
| WO (1) | WO2022249798A1 (en) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58147509A (en) * | 1982-02-26 | 1983-09-02 | Kawasaki Steel Corp | Refining method of stainless steel |
| JPS5925916A (en) * | 1982-08-02 | 1984-02-10 | Kawasaki Steel Corp | Refining method of chromium containing alloy pig |
| JPS60194009A (en) * | 1984-03-14 | 1985-10-02 | Kawasaki Steel Corp | Method for refining stainless steel |
| JPS61223117A (en) * | 1985-03-29 | 1986-10-03 | Kawasaki Steel Corp | Method for reducing and recovering metallic oxide in molten slag |
| JP3309395B2 (en) * | 1990-12-25 | 2002-07-29 | 住友金属工業株式会社 | Converter refining method |
| JP2754983B2 (en) * | 1991-09-26 | 1998-05-20 | 住友金属工業株式会社 | Converter refining method |
| JP3496529B2 (en) | 1998-07-29 | 2004-02-16 | 住友金属工業株式会社 | RH vacuum refining method |
| JP3922181B2 (en) | 2002-12-27 | 2007-05-30 | Ｊｆｅスチール株式会社 | Melting method of high clean steel |
| JP5092245B2 (en) | 2006-02-09 | 2012-12-05 | Ｊｆｅスチール株式会社 | Denitrification method for molten steel |
| JP5428447B2 (en) * | 2008-03-31 | 2014-02-26 | Ｊｆｅスチール株式会社 | Method for refining molten steel in RH vacuum degassing equipment |
| JP5526565B2 (en) * | 2009-03-09 | 2014-06-18 | Ｊｆｅスチール株式会社 | Converter steelmaking |
| JP5589688B2 (en) * | 2009-09-10 | 2014-09-17 | Ｊｆｅスチール株式会社 | Hot metal production method |
| JP5910579B2 (en) * | 2013-08-01 | 2016-04-27 | Ｊｆｅスチール株式会社 | Melting method of ultra-low nitrogen pure iron |
| CN109852766B (en) * | 2018-12-05 | 2020-11-03 | 敬业钢铁有限公司 | Hydrogen and oxygen control process for RH furnace refining |
| CN111270036A (en) * | 2020-04-05 | 2020-06-12 | 上海泰普星坦新材料有限公司 | System and process method for producing sponge iron by direct reduction of hydrogen energy |
-
2022
- 2022-04-19 KR KR1020237037654A patent/KR20230162108A/en unknown
- 2022-04-19 EP EP22811072.2A patent/EP4328330A1/en active Pending
- 2022-04-19 WO PCT/JP2022/018168 patent/WO2022249798A1/en active Application Filing
- 2022-04-19 JP JP2022545913A patent/JP7384294B2/en active Active
- 2022-04-19 BR BR112023024464A patent/BR112023024464A2/en unknown
- 2022-04-19 CN CN202280037168.2A patent/CN117377781A/en active Pending
- 2022-05-18 TW TW111118446A patent/TWI817507B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022249798A1 (en) | 2022-12-01 |
| TW202246528A (en) | 2022-12-01 |
| EP4328330A1 (en) | 2024-02-28 |
| JPWO2022249798A1 (en) | 2022-12-01 |
| TWI817507B (en) | 2023-10-01 |
| CN117377781A (en) | 2024-01-09 |
| KR20230162108A (en) | 2023-11-28 |
| JP7384294B2 (en) | 2023-11-21 |
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