JPS5623214A - Dephosphorization accelerating method in oxygen top blowing steel making method - Google Patents

Dephosphorization accelerating method in oxygen top blowing steel making method

Info

Publication number
JPS5623214A
JPS5623214A JP9806479A JP9806479A JPS5623214A JP S5623214 A JPS5623214 A JP S5623214A JP 9806479 A JP9806479 A JP 9806479A JP 9806479 A JP9806479 A JP 9806479A JP S5623214 A JPS5623214 A JP S5623214A
Authority
JP
Japan
Prior art keywords
slag
molten
oxygen
blowing
dephosphorization
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
JP9806479A
Other languages
Japanese (ja)
Other versions
JPS5847450B2 (en
Inventor
Kazuo Ogahira
Masazumi Hirai
Hiroshi Iida
Shozo Murakami
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 JP54098064A priority Critical patent/JPS5847450B2/en
Publication of JPS5623214A publication Critical patent/JPS5623214A/en
Publication of JPS5847450B2 publication Critical patent/JPS5847450B2/en
Expired 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

PURPOSE:To improve the dephosphorization effect of molten steel with slag of less Fe content by controlling the basicity and T, Fe amounts of the slag to the specific value after ending of oxygen blowing and flushing at the time of performing steel smelting by an oxygen top blowing converter provided with bottom tuyeres. CONSTITUTION:At the time of performing steel smelting by decarbonizing molten iron with an oxygen top blowing converter having a bottom blowing function, CaO- contg. flux is added to the molten iron in such a manner that the basicity of the molten slag i.e. CaO/SiO2 beomes 2 or more at the end of blowing. In addition, the FeO in the molten slag is so controlled as to become >=10% in T, Fe equiv. by increasing the amount of oxygen blown or added iron ore, sintered ore, etc. Next, an inert gas such as Ar gas is blown at a rate of >=5Nm<3>/hr per ton of the molten steel through the bottom tuyeres, whereby flushing is accomplished. While the amount of loss of Fe into the molten slag in the form of FeO is being reduced, the P in the molten steel is easily oxidized to P2O5 to form stable compound with CaO and slag, whereby dephosphorization reaction is accelerated.
JP54098064A 1979-08-02 1979-08-02 Method for promoting dephosphorization in oxygen top-blown steelmaking process Expired JPS5847450B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54098064A JPS5847450B2 (en) 1979-08-02 1979-08-02 Method for promoting dephosphorization in oxygen top-blown steelmaking process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54098064A JPS5847450B2 (en) 1979-08-02 1979-08-02 Method for promoting dephosphorization in oxygen top-blown steelmaking process

Publications (2)

Publication Number Publication Date
JPS5623214A true JPS5623214A (en) 1981-03-05
JPS5847450B2 JPS5847450B2 (en) 1983-10-22

Family

ID=14209890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54098064A Expired JPS5847450B2 (en) 1979-08-02 1979-08-02 Method for promoting dephosphorization in oxygen top-blown steelmaking process

Country Status (1)

Country Link
JP (1) JPS5847450B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58167706A (en) * 1982-03-29 1983-10-04 Nippon Kokan Kk <Nkk> Method of smelting low-p steel by top and bottom-blown converter
CN104046719A (en) * 2014-06-27 2014-09-17 攀钢集团攀枝花钢钒有限公司 Method for controlling nitrogen content of molten steel in converter steel-making
CN104109727A (en) * 2014-07-17 2014-10-22 攀钢集团西昌钢钒有限公司 Method for smelting low-phosphorous steel by using semisteel through converter
CN106521076A (en) * 2016-11-14 2017-03-22 攀钢集团攀枝花钢铁研究院有限公司 Method for controlling nitrogen increment in process of converter steel tapping

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55164014A (en) * 1979-06-08 1980-12-20 Sumitomo Metal Ind Ltd Steel refining method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55164014A (en) * 1979-06-08 1980-12-20 Sumitomo Metal Ind Ltd Steel refining method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58167706A (en) * 1982-03-29 1983-10-04 Nippon Kokan Kk <Nkk> Method of smelting low-p steel by top and bottom-blown converter
CN104046719A (en) * 2014-06-27 2014-09-17 攀钢集团攀枝花钢钒有限公司 Method for controlling nitrogen content of molten steel in converter steel-making
CN104109727A (en) * 2014-07-17 2014-10-22 攀钢集团西昌钢钒有限公司 Method for smelting low-phosphorous steel by using semisteel through converter
CN106521076A (en) * 2016-11-14 2017-03-22 攀钢集团攀枝花钢铁研究院有限公司 Method for controlling nitrogen increment in process of converter steel tapping

Also Published As

Publication number Publication date
JPS5847450B2 (en) 1983-10-22

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