JPS5743923A - Method for preventing rephosphorization - Google Patents

Method for preventing rephosphorization

Info

Publication number
JPS5743923A
JPS5743923A JP11931480A JP11931480A JPS5743923A JP S5743923 A JPS5743923 A JP S5743923A JP 11931480 A JP11931480 A JP 11931480A JP 11931480 A JP11931480 A JP 11931480A JP S5743923 A JPS5743923 A JP S5743923A
Authority
JP
Japan
Prior art keywords
slag
ladle
converter
concentration
prevented
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.)
Pending
Application number
JP11931480A
Other languages
Japanese (ja)
Inventor
Hiroshi Nomura
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.)
JFE Steel Corp
Original Assignee
Kawasaki 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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP11931480A priority Critical patent/JPS5743923A/en
Publication of JPS5743923A publication Critical patent/JPS5743923A/en
Pending 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
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • 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

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)

Abstract

PURPOSE:To substantially prevent the rephosphorization in a ladle by a method wherein a slag diluting agent consisting of an inorganic refractory material is added in the final period of the blowing process in a converter or during tapping of steel from the converter into a ladle so as to regulate the concentration of P2O5 in a slag to be not higher than a predetermined value. CONSTITUTION:The slag diluting agent consisting of an inorganic refractory material is added either into the converter in the final period of the blowing process in a basic oxygen converter or into the ladle during tapping of the molten steel from the converter into the ladle, so as to regulate the P2O5 concentration in the slag to be not higher than 1.0%, particularly 0.8% or below. As the inorganic refractory material, one that contains no phosphorus component, for example, a brick layer of the converter, gravel or the like is used. By the regulation of the P2O5 concentration in the slag, P2O5 in the slag is prevented from being further reduced in the deoxidizing process conducted in the ladle for producing a killed steel, so that the rephosphorizing phenomenon is prevented, that is, the P concentration in the molten steel in the ladle is prevented from increasing.
JP11931480A 1980-08-29 1980-08-29 Method for preventing rephosphorization Pending JPS5743923A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11931480A JPS5743923A (en) 1980-08-29 1980-08-29 Method for preventing rephosphorization

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11931480A JPS5743923A (en) 1980-08-29 1980-08-29 Method for preventing rephosphorization

Publications (1)

Publication Number Publication Date
JPS5743923A true JPS5743923A (en) 1982-03-12

Family

ID=14758369

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11931480A Pending JPS5743923A (en) 1980-08-29 1980-08-29 Method for preventing rephosphorization

Country Status (1)

Country Link
JP (1) JPS5743923A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017115173A (en) * 2015-12-21 2017-06-29 株式会社神戸製鋼所 Operation method of converter
JP2019023355A (en) * 2018-11-09 2019-02-14 株式会社神戸製鋼所 Operation method of converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017115173A (en) * 2015-12-21 2017-06-29 株式会社神戸製鋼所 Operation method of converter
JP2019023355A (en) * 2018-11-09 2019-02-14 株式会社神戸製鋼所 Operation method of converter

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