JPS57140810A - Refining method for steel - Google Patents

Refining method for steel

Info

Publication number
JPS57140810A
JPS57140810A JP2516181A JP2516181A JPS57140810A JP S57140810 A JPS57140810 A JP S57140810A JP 2516181 A JP2516181 A JP 2516181A JP 2516181 A JP2516181 A JP 2516181A JP S57140810 A JPS57140810 A JP S57140810A
Authority
JP
Japan
Prior art keywords
gas
solid material
refining
supply rate
cracked
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
JP2516181A
Other languages
Japanese (ja)
Inventor
Yozo Takemura
Isao Kobayashi
Yasuhiro Akita
Iku Kato
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 JP2516181A priority Critical patent/JPS57140810A/en
Priority to US06/305,259 priority patent/US4388113A/en
Priority to ES505740A priority patent/ES8303534A1/en
Priority to CA000386735A priority patent/CA1170460A/en
Priority to BR8106166A priority patent/BR8106166A/en
Priority to AU75681/81A priority patent/AU531023B2/en
Priority to EP81304470A priority patent/EP0049148B1/en
Priority to DE8181304470T priority patent/DE3176581D1/en
Priority to AT81304470T priority patent/ATE31551T1/en
Publication of JPS57140810A publication Critical patent/JPS57140810A/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
    • C21C5/34—Blowing through the bath

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)

Abstract

PURPOSE:To perform refining of steel under good agitation of a steel bath by entraining a solid material which produces a cracked gas easily at the temp. of molten iron into the blowing gas from below the steel bath and chaning the supply rate of said solid material thereby controlling the amt. of the produced gas. CONSTITUTION:A solid material (e.g.; CaCO3) which generates a cracked gas at the refining temp. or below is mixed with a gas (e.g. pure oxygen, N2) to be blown through a tuyere from below the steel bath. In this case, the gas and the solid material are blown simultaneously, and in the second half of the refining, the supply rate of the solid material is increased without increasing the amt. of the gas. More specifically, the supply rate of the solid material is so controlled that the total sum of the blowing gas and the cracked and produced gas increases to 1.5 times or above in about 50% period in the scond half with respect to the time up to about 50% the first half during the refining period. As a result, the agitation of the slag and the metal is improved, the effect of dephosphorization is improved and the superior refining effect of high blowing-out Mn and less T, and Fe in the slag is obtained.
JP2516181A 1980-09-26 1981-02-23 Refining method for steel Pending JPS57140810A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP2516181A JPS57140810A (en) 1981-02-23 1981-02-23 Refining method for steel
US06/305,259 US4388113A (en) 1980-09-26 1981-09-24 Method of preventing damage of an immersed tuyere of a decarburization furnace in steel making
ES505740A ES8303534A1 (en) 1980-09-26 1981-09-24 A method of preventing damage to an immersed tuyere of a decarburization furnace in steel making.
CA000386735A CA1170460A (en) 1980-09-26 1981-09-25 Method of preventing damage of an immersed tuyere of a decarburization furnace in steel making
BR8106166A BR8106166A (en) 1980-09-26 1981-09-25 PROCESS TO PREVENT DAMAGE TO AN IMMERSED VENTANEIRA DE A DECARBURATION OVEN IN STEEL MANUFACTURING AND REDUCE THE SHAKING STRENGTH OF THE CAST METAL BATH
AU75681/81A AU531023B2 (en) 1980-09-26 1981-09-25 Preventing damage of an immersed tuyere
EP81304470A EP0049148B1 (en) 1980-09-26 1981-09-28 A method of preventing damage to an immersed tuyere of a decarburization furnace in steel making
DE8181304470T DE3176581D1 (en) 1980-09-26 1981-09-28 A method of preventing damage to an immersed tuyere of a decarburization furnace in steel making
AT81304470T ATE31551T1 (en) 1980-09-26 1981-09-28 METHOD OF PREVENTING DAMAGE TO AN IMMERSION NOZZLE OF A STEEL DECARBURIZING FURNACE IN STEELMAKING.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2516181A JPS57140810A (en) 1981-02-23 1981-02-23 Refining method for steel

Publications (1)

Publication Number Publication Date
JPS57140810A true JPS57140810A (en) 1982-08-31

Family

ID=12158286

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2516181A Pending JPS57140810A (en) 1980-09-26 1981-02-23 Refining method for steel

Country Status (1)

Country Link
JP (1) JPS57140810A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4820711A (en) * 1971-07-19 1973-03-15
JPS4876715A (en) * 1971-12-06 1973-10-16
JPS49129617A (en) * 1973-04-04 1974-12-12
JPS51119316A (en) * 1975-02-25 1976-10-19 Salzgitter Peine Stahlwerke Method and apparatus for producing of steel prom pig iron

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4820711A (en) * 1971-07-19 1973-03-15
JPS4876715A (en) * 1971-12-06 1973-10-16
JPS49129617A (en) * 1973-04-04 1974-12-12
JPS51119316A (en) * 1975-02-25 1976-10-19 Salzgitter Peine Stahlwerke Method and apparatus for producing of steel prom pig iron

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