JPS56133413A - Steel making method by divided refining - Google Patents

Steel making method by divided refining

Info

Publication number
JPS56133413A
JPS56133413A JP3469380A JP3469380A JPS56133413A JP S56133413 A JPS56133413 A JP S56133413A JP 3469380 A JP3469380 A JP 3469380A JP 3469380 A JP3469380 A JP 3469380A JP S56133413 A JPS56133413 A JP S56133413A
Authority
JP
Japan
Prior art keywords
blown
vessel
molten iron
inert gas
carrier gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3469380A
Other languages
Japanese (ja)
Other versions
JPS6362562B2 (en
Inventor
Hiroyuki Nakajima
Morihiro Sumita
Hironori Goto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP3469380A priority Critical patent/JPS56133413A/en
Priority to AU68239/81A priority patent/AU6823981A/en
Priority to US06/243,451 priority patent/US4388112A/en
Priority to BE0/204174A priority patent/BE888007A/en
Priority to DE3110787A priority patent/DE3110787C2/en
Priority to CA000373463A priority patent/CA1166018A/en
Priority to FR8105574A priority patent/FR2478671B1/en
Priority to GB8108981A priority patent/GB2072221B/en
Priority to BR8101709A priority patent/BR8101709A/en
Publication of JPS56133413A publication Critical patent/JPS56133413A/en
Priority to US06/362,839 priority patent/US4411696A/en
Priority to US06/504,285 priority patent/US4457778A/en
Priority to AU22238/83A priority patent/AU549698B2/en
Publication of JPS6362562B2 publication Critical patent/JPS6362562B2/ja
Granted legal-status Critical Current

Links

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
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • 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
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C5/285—Plants therefor
    • 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
    • C21C5/56—Manufacture of steel by other methods
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Botany (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE: To perform refining which is balanced in quality and economy by arranging the removal processes which are divided to four independent processes; desiliconizing, dephosphorizing, decarbonizing and desulfurizing in this order in the entire refininf process from molten iron to molten steel.
CONSTITUTION: In the 1st process, iron oxide is added to the molten iron flowing out from a blast furnace or the molten iron is put into a vessel and iron oxide is blown by a carrier gas which is an inert gas, whereby silicon content is lowered to 0.1W0.2%, and the formed slag is separated. In the 2nd process, a dephosphorizing agent consisting essentially of iron oxide and CaO is blown by a carrier gas which is an inert gas into the molten iron in the vessel, whereby phosphorus content is lowered to 0.015W0.04% and the formed slag is removed. In the 3rd process, decarburizing reaction is accelerated and the temp. is elevated by converter blowing. In the 4th process, a desulfurizing agent consisting essentially of CaO is blown by a carrier gas which is an inert gas into the molten steel in the vessel after tapping, whereby the desulfurization treatment is executed.
COPYRIGHT: (C)1981,JPO&Japio
JP3469380A 1980-03-21 1980-03-21 Steel making method by divided refining Granted JPS56133413A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
JP3469380A JPS56133413A (en) 1980-03-21 1980-03-21 Steel making method by divided refining
AU68239/81A AU6823981A (en) 1980-03-21 1981-03-10 Multi-stage steel making
US06/243,451 US4388112A (en) 1980-03-21 1981-03-13 Steelmaking process with separate refining steps
BE0/204174A BE888007A (en) 1980-03-21 1981-03-18 PROCESS FOR THE PREPARATION OF STEEL WITH SEPARATE REFINING STEPS
DE3110787A DE3110787C2 (en) 1980-03-21 1981-03-19 Steel manufacturing process
CA000373463A CA1166018A (en) 1980-03-21 1981-03-19 Steelmaking process with separate refining steps
FR8105574A FR2478671B1 (en) 1980-03-21 1981-03-20 PROCESS FOR THE PREPARATION OF STEEL BY SEPARATE REFINING STEPS
GB8108981A GB2072221B (en) 1980-03-21 1981-03-23 Steelmaking process with separate refining steps
BR8101709A BR8101709A (en) 1980-03-21 1981-03-23 STEEL MANUFACTURING PROCESS WITH SEPARATE REFINING STAGES
US06/362,839 US4411696A (en) 1980-03-21 1982-03-29 Steelmaking process with separate refining steps
US06/504,285 US4457778A (en) 1980-03-21 1983-06-14 Steelmaking process with separate refining steps
AU22238/83A AU549698B2 (en) 1980-03-21 1983-12-08 Steel making process with separate steps in sequence

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3469380A JPS56133413A (en) 1980-03-21 1980-03-21 Steel making method by divided refining

Publications (2)

Publication Number Publication Date
JPS56133413A true JPS56133413A (en) 1981-10-19
JPS6362562B2 JPS6362562B2 (en) 1988-12-02

Family

ID=12421453

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3469380A Granted JPS56133413A (en) 1980-03-21 1980-03-21 Steel making method by divided refining

Country Status (2)

Country Link
JP (1) JPS56133413A (en)
BE (1) BE888007A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS591609A (en) * 1982-06-28 1984-01-07 Nippon Steel Corp Refining method of molten iron
JPS5980711A (en) * 1982-09-23 1984-05-10 ナシヨナル・リサ−チ・デイベロツプメント・コ−ポレイシヨン Removal phosphorus from iron
JPH0413751U (en) * 1990-05-24 1992-02-04
JP2015178659A (en) * 2014-03-19 2015-10-08 株式会社神戸製鋼所 Desiliconization with recycling desiliconized slag, dephosphorization and decarbonization method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5831012A (en) * 1981-08-19 1983-02-23 Nippon Steel Corp Preferential desiliconizing method for molten iron by blowing of gaseous oxygen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5237510A (en) * 1975-09-19 1977-03-23 Nippon Steel Corp Dephosphorization method of molten cast iron
JPS5445611A (en) * 1977-09-16 1979-04-11 Kobe Steel Ltd Treating molten metal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5237510A (en) * 1975-09-19 1977-03-23 Nippon Steel Corp Dephosphorization method of molten cast iron
JPS5445611A (en) * 1977-09-16 1979-04-11 Kobe Steel Ltd Treating molten metal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS591609A (en) * 1982-06-28 1984-01-07 Nippon Steel Corp Refining method of molten iron
JPS5980711A (en) * 1982-09-23 1984-05-10 ナシヨナル・リサ−チ・デイベロツプメント・コ−ポレイシヨン Removal phosphorus from iron
JPH0413751U (en) * 1990-05-24 1992-02-04
JP2015178659A (en) * 2014-03-19 2015-10-08 株式会社神戸製鋼所 Desiliconization with recycling desiliconized slag, dephosphorization and decarbonization method

Also Published As

Publication number Publication date
JPS6362562B2 (en) 1988-12-02
BE888007A (en) 1981-07-16

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