JPS5594412A - Refining of high purity steel - Google Patents

Refining of high purity steel

Info

Publication number
JPS5594412A
JPS5594412A JP258379A JP258379A JPS5594412A JP S5594412 A JPS5594412 A JP S5594412A JP 258379 A JP258379 A JP 258379A JP 258379 A JP258379 A JP 258379A JP S5594412 A JPS5594412 A JP S5594412A
Authority
JP
Japan
Prior art keywords
slag
steel
base
under
cao
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
JP258379A
Other languages
Japanese (ja)
Inventor
Satomi Yamamoto
Hiroyuki Kajioka
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 JP258379A priority Critical patent/JPS5594412A/en
Publication of JPS5594412A publication Critical patent/JPS5594412A/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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (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)

Abstract

PURPOSE:To produce the high purity steel of less P, S, Mn, N, etc. by desiliconizing, desulphurizing, dephosphorizing and prerefining molten iron for steel making under the CaO-base slag added with soda ash then removing this slag and finishig the iron under CaO-base slag in an oxygen steel making furnace. CONSTITUTION:Raw material molten iron for steel making is first subjected to oxidation refining under CaO-base- or Na2CO3-base slag. Si is oxidation-desiliconized down to 0.1-0.3% and 40-60% of Mn and 20-30% of P respectively oxidize and are removed in the slag. After this slag is removed, the iron is subjected to oxidation refining under Na2CO3-base slag to make [P]<0.02%, [S]<0.010%, [Mn]<0.10%, [N]<0.0010%. Next, this molten iron is refined in a steel making furnace under CaO-base slag, whereby the high purity steel of [P]<0.010%, [S]< 0.0020%, [Mn]<0.010%, [N]<0.0010%, [H]<0.0002% is obtained. Here, the C content of the steel of this time is the final decarbonization refining and may be produced even by high carbon steel.
JP258379A 1979-01-13 1979-01-13 Refining of high purity steel Pending JPS5594412A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP258379A JPS5594412A (en) 1979-01-13 1979-01-13 Refining of high purity steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP258379A JPS5594412A (en) 1979-01-13 1979-01-13 Refining of high purity steel

Publications (1)

Publication Number Publication Date
JPS5594412A true JPS5594412A (en) 1980-07-17

Family

ID=11533387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP258379A Pending JPS5594412A (en) 1979-01-13 1979-01-13 Refining of high purity steel

Country Status (1)

Country Link
JP (1) JPS5594412A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57177910A (en) * 1981-04-28 1982-11-01 Nippon Steel Corp Production of extra low nitrogen ingot

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57177910A (en) * 1981-04-28 1982-11-01 Nippon Steel Corp Production of extra low nitrogen ingot

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