JPS552759A - Manufacture of ultra-low-carbon stainless steel - Google Patents

Manufacture of ultra-low-carbon stainless steel

Info

Publication number
JPS552759A
JPS552759A JP7543278A JP7543278A JPS552759A JP S552759 A JPS552759 A JP S552759A JP 7543278 A JP7543278 A JP 7543278A JP 7543278 A JP7543278 A JP 7543278A JP S552759 A JPS552759 A JP S552759A
Authority
JP
Japan
Prior art keywords
inert gas
low
stainless steel
runs
molten
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
JP7543278A
Other languages
Japanese (ja)
Inventor
Shigeaki Maruhashi
Yoshio Kobayashi
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 Nisshin Co Ltd
Original Assignee
Nisshin Steel Co Ltd
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 Nisshin Steel Co Ltd filed Critical Nisshin Steel Co Ltd
Priority to JP7543278A priority Critical patent/JPS552759A/en
Publication of JPS552759A publication Critical patent/JPS552759A/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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE:To stably manufacture the ultra-low-carbon stainless steel, by feeding the inert gas against the molten low carbon steel obtained in the vacuum refining furnace under the condition of the reduced pressure and the existence of the slag, and by feeding oxygen or inert gas through the immersed runs. CONSTITUTION:The molten stainless steel, being roughly refined by decarburization so as to include about 0.3% C, is poured into the ladle 1 which is then placed within the vacuum vessel 4. The inside of the vessel 4 is evacuated, and the inert gas is introduced through the porous plug 3 for stirring the molten steel; at the same time, the pure oxygen is introduced through the runs 5 so as to blow the oxygen against the upper zone of the molten steel to be refined; hereby, the carbon content is reduced to 0.01-0.02% C. Next, while the reduced pressure is being kept as it is, and the existence of the slag 6 at least 2.5kg per ton of molten steel is permitted, the inert gas is introduced through the porous plug 3; at the same time, the runs 5 is immersed into the molten steel, and the oxygen or inert gas is blown through the runs 5. According to this method, the ultra-low-carbon stainless steel with the carbon content reduced to about C<0.005% can be manufactured.
JP7543278A 1978-06-23 1978-06-23 Manufacture of ultra-low-carbon stainless steel Pending JPS552759A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7543278A JPS552759A (en) 1978-06-23 1978-06-23 Manufacture of ultra-low-carbon stainless steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7543278A JPS552759A (en) 1978-06-23 1978-06-23 Manufacture of ultra-low-carbon stainless steel

Publications (1)

Publication Number Publication Date
JPS552759A true JPS552759A (en) 1980-01-10

Family

ID=13576046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7543278A Pending JPS552759A (en) 1978-06-23 1978-06-23 Manufacture of ultra-low-carbon stainless steel

Country Status (1)

Country Link
JP (1) JPS552759A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61119612A (en) * 1984-11-14 1986-06-06 Sumitomo Metal Ind Ltd Method for simultaneously removing copper and tin from molten iron
JPH03281718A (en) * 1990-03-29 1991-12-12 Nippon Steel Corp Production of dead-soft carbon steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61119612A (en) * 1984-11-14 1986-06-06 Sumitomo Metal Ind Ltd Method for simultaneously removing copper and tin from molten iron
JPH0448843B2 (en) * 1984-11-14 1992-08-07 Sumitomo Metal Ind
JPH03281718A (en) * 1990-03-29 1991-12-12 Nippon Steel Corp Production of dead-soft carbon steel

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