JPS57177910A - Production of extra low nitrogen ingot - Google Patents

Production of extra low nitrogen ingot

Info

Publication number
JPS57177910A
JPS57177910A JP6326181A JP6326181A JPS57177910A JP S57177910 A JPS57177910 A JP S57177910A JP 6326181 A JP6326181 A JP 6326181A JP 6326181 A JP6326181 A JP 6326181A JP S57177910 A JPS57177910 A JP S57177910A
Authority
JP
Japan
Prior art keywords
steel
molten iron
nitrogen
ingot
oxidizing agent
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
JP6326181A
Other languages
Japanese (ja)
Inventor
Yozo Takemura
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 JP6326181A priority Critical patent/JPS57177910A/en
Publication of JPS57177910A publication Critical patent/JPS57177910A/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)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Continuous Casting (AREA)

Abstract

PURPOSE:To produce an extra low nitrogen ingot inexpensively in desiliconization (de-Si) or desiliconization and dephosphorization (de-S, -P) treatments of molten iron by blowing an oxidizing agent into molten iron in the absence of nitrogen then refining and continuously casting the same by conventional methods. CONSTITUTION:In de-Si, de-S, -P states, an oxidizing agent is blown onto molten iron by using a gas such as Ar or CO2 other than gaseous N2. At this time, the amt. of the using oxidizing agent is set at least 6 Nm<3>/t-molten iron expressed in terms of gaseous nitrogen. The resultant low N molten iron is subjected to decarbonization refining by oxygen blowing according to conventional methods, to low N steel. Then while nitrogen addition to the molten steel is prevented, the molten steel is continuously cast, and the extra low N steel ingot reduced of N in steel to about <=10ppm is produced.
JP6326181A 1981-04-28 1981-04-28 Production of extra low nitrogen ingot Pending JPS57177910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6326181A JPS57177910A (en) 1981-04-28 1981-04-28 Production of extra low nitrogen ingot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6326181A JPS57177910A (en) 1981-04-28 1981-04-28 Production of extra low nitrogen ingot

Publications (1)

Publication Number Publication Date
JPS57177910A true JPS57177910A (en) 1982-11-01

Family

ID=13224152

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6326181A Pending JPS57177910A (en) 1981-04-28 1981-04-28 Production of extra low nitrogen ingot

Country Status (1)

Country Link
JP (1) JPS57177910A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6126713A (en) * 1984-07-17 1986-02-06 Nippon Steel Corp Method for denitrifying molten iron or molten steel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5387918A (en) * 1977-01-12 1978-08-02 Nippon Steel Corp Refining method for low nitrogen steel
JPS5594412A (en) * 1979-01-13 1980-07-17 Nippon Steel Corp Refining of high purity steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5387918A (en) * 1977-01-12 1978-08-02 Nippon Steel Corp Refining method for low nitrogen steel
JPS5594412A (en) * 1979-01-13 1980-07-17 Nippon Steel Corp Refining of high purity steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6126713A (en) * 1984-07-17 1986-02-06 Nippon Steel Corp Method for denitrifying molten iron or molten steel

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