JPS5594422A - Oxygen steel making method of molten iron having beforehand undergone dephosphorization and desulfurization - Google Patents

Oxygen steel making method of molten iron having beforehand undergone dephosphorization and desulfurization

Info

Publication number
JPS5594422A
JPS5594422A JP257579A JP257579A JPS5594422A JP S5594422 A JPS5594422 A JP S5594422A JP 257579 A JP257579 A JP 257579A JP 257579 A JP257579 A JP 257579A JP S5594422 A JPS5594422 A JP S5594422A
Authority
JP
Japan
Prior art keywords
oxygen
blowing
molten
slag
molten iron
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
JP257579A
Other languages
Japanese (ja)
Inventor
Satomi Yamamoto
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 JP257579A priority Critical patent/JPS5594422A/en
Publication of JPS5594422A publication Critical patent/JPS5594422A/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
    • 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)

Abstract

PURPOSE:To improve the achievement rate of the [C] and temperature of molten steel at the blowing-out to the target values and oxygen efficiency by charging the molten iron which has beforehand undergone desiliconization, desulfurization and dephosphorization into a converter, and oxygen blowing the same under a fixed oxygen efficiency in a slag-free state. CONSTITUTION:Raw material molten steel for steel making is subjected to oxidation pretreatment with alkali metal compounds such as Na2CO3 as flux, whereby its Si, P and S are removed into the molten slag. The molten iron which has been considerably reduced of the contents of Si, P and S through the pretreatment is separated from the molten slag and is charged into an oxygen top blowing converter. Since the oxygen efficiency in the slag-free decarbonization oxygen blowing is as high as 97% and the decarbonization progresses at a fixed rate, the achievement rate of blowing-out at the target [C] and temperature depending upon the kinds of the steels to be produced is high and the refining efficiency high.
JP257579A 1979-01-13 1979-01-13 Oxygen steel making method of molten iron having beforehand undergone dephosphorization and desulfurization Pending JPS5594422A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP257579A JPS5594422A (en) 1979-01-13 1979-01-13 Oxygen steel making method of molten iron having beforehand undergone dephosphorization and desulfurization

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP257579A JPS5594422A (en) 1979-01-13 1979-01-13 Oxygen steel making method of molten iron having beforehand undergone dephosphorization and desulfurization

Publications (1)

Publication Number Publication Date
JPS5594422A true JPS5594422A (en) 1980-07-17

Family

ID=11533164

Family Applications (1)

Application Number Title Priority Date Filing Date
JP257579A Pending JPS5594422A (en) 1979-01-13 1979-01-13 Oxygen steel making method of molten iron having beforehand undergone dephosphorization and desulfurization

Country Status (1)

Country Link
JP (1) JPS5594422A (en)

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