JPS5623213A - Melting method of low phosphorus steel in oxygen top blowing steel making method - Google Patents

Melting method of low phosphorus steel in oxygen top blowing steel making method

Info

Publication number
JPS5623213A
JPS5623213A JP9806379A JP9806379A JPS5623213A JP S5623213 A JPS5623213 A JP S5623213A JP 9806379 A JP9806379 A JP 9806379A JP 9806379 A JP9806379 A JP 9806379A JP S5623213 A JPS5623213 A JP S5623213A
Authority
JP
Japan
Prior art keywords
steel
blowing
oxygen
molten
low phosphorus
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.)
Granted
Application number
JP9806379A
Other languages
Japanese (ja)
Other versions
JPS6214603B2 (en
Inventor
Kazuo Ogahira
Masazumi Hirai
Yoshio Sato
Akihiko Ochi
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 JP9806379A priority Critical patent/JPS5623213A/en
Publication of JPS5623213A publication Critical patent/JPS5623213A/en
Publication of JPS6214603B2 publication Critical patent/JPS6214603B2/ja
Granted 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

Abstract

PURPOSE:To make possible the production of low phosphorus steel with ease by blowing oxygen while blowing an inert gas through the furnace bottom at the time of performing iron making refining by the use of high basic molten slag with an oxygen top blowing converter provided with a bottom blowing function. CONSTITUTION:In making low phosphorus steel of <=0.010% P with a converter by using low phosphorus iron of 0.080-0.150% P as raw material, slag of >=2.5 basicity is used. In addition, the molten metal is agitated by blowing an inert gas of Ar or the like through the bottom nozzle of the converter at a rate of 5-50Nm<3>/Hr per ton of molten steel to improve the contact between the molten metal and the molten slag. Also, oxygen blowing is performed by using an oxygen gas of >=46Nm<3> per ton of the molten steel. By the oxidation action by this oxygen, FeO is contained at >=12% as Fe in the molten slag, and this coupled with the high basicity of the molten slag accelerate the dephosphorization reaction of the molten steel, thus the low phosphorus steel of <0.010% P is easily produced.
JP9806379A 1979-08-02 1979-08-02 Melting method of low phosphorus steel in oxygen top blowing steel making method Granted JPS5623213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9806379A JPS5623213A (en) 1979-08-02 1979-08-02 Melting method of low phosphorus steel in oxygen top blowing steel making method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9806379A JPS5623213A (en) 1979-08-02 1979-08-02 Melting method of low phosphorus steel in oxygen top blowing steel making method

Publications (2)

Publication Number Publication Date
JPS5623213A true JPS5623213A (en) 1981-03-05
JPS6214603B2 JPS6214603B2 (en) 1987-04-03

Family

ID=14209860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9806379A Granted JPS5623213A (en) 1979-08-02 1979-08-02 Melting method of low phosphorus steel in oxygen top blowing steel making method

Country Status (1)

Country Link
JP (1) JPS5623213A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58167706A (en) * 1982-03-29 1983-10-04 Nippon Kokan Kk <Nkk> Method of smelting low-p steel by top and bottom-blown converter
CN103555878A (en) * 2013-11-25 2014-02-05 武钢集团昆明钢铁股份有限公司 Safe and high-efficient low-silicon molten-ion blowing process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58167706A (en) * 1982-03-29 1983-10-04 Nippon Kokan Kk <Nkk> Method of smelting low-p steel by top and bottom-blown converter
CN103555878A (en) * 2013-11-25 2014-02-05 武钢集团昆明钢铁股份有限公司 Safe and high-efficient low-silicon molten-ion blowing process

Also Published As

Publication number Publication date
JPS6214603B2 (en) 1987-04-03

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