JPS56139613A - Production of clean steel - Google Patents

Production of clean steel

Info

Publication number
JPS56139613A
JPS56139613A JP4277480A JP4277480A JPS56139613A JP S56139613 A JPS56139613 A JP S56139613A JP 4277480 A JP4277480 A JP 4277480A JP 4277480 A JP4277480 A JP 4277480A JP S56139613 A JPS56139613 A JP S56139613A
Authority
JP
Japan
Prior art keywords
ladle
molten steel
intermediate vessel
steel
concn
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
JP4277480A
Other languages
Japanese (ja)
Inventor
Shinobu Miyahara
Isao Sugawara
Hidehiko Ogura
Shigetaka Uchida
Toshiaki Ishida
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP4277480A priority Critical patent/JPS56139613A/en
Publication of JPS56139613A publication Critical patent/JPS56139613A/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
    • C21C7/0006—Adding metallic additives

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 perform effective form adjustment of sulfide and produce a steel of superior resistance characteristic to induced hydrogen embrittlement in particular by adding Ca dividedly in two stages to a ladle in which O and S are melted respectively at less than prescribed contents and an intermediate vessel from the ladle to a mold. CONSTITUTION:First Ca or Ca alloy is added under stirring at 0.1-0.4kg per ton molten steel into the molten steel in a ladle having beforehand been controlled to low concentrations of <=0.002% S and <=0.003% O, respectively, through desulfurizing and deoxidizing treatments. Even after the addition, the molten steel is stireed for a few minutes in succession, to float and separate the formed Ca type inclusions (e.g.; CaO), after which the molten steel is poured into an intermediate vessel from the ladle into a mold. Next, the amount of Ca shown by the formula is added according to the S concn. in the molten steel and the addition amount of Ca in the ladle into the intermediate vessel having been sufficiently lowered of the concn. of the atmosphere oxygen. As a result, the sulfide is perfectly form-controlled over the entire length of the continuously cast slab to prevent the deposition of MnS and the steel plate of good cleanliness and high HIC resistance performance is obtained.
JP4277480A 1980-04-03 1980-04-03 Production of clean steel Pending JPS56139613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4277480A JPS56139613A (en) 1980-04-03 1980-04-03 Production of clean steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4277480A JPS56139613A (en) 1980-04-03 1980-04-03 Production of clean steel

Publications (1)

Publication Number Publication Date
JPS56139613A true JPS56139613A (en) 1981-10-31

Family

ID=12645309

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4277480A Pending JPS56139613A (en) 1980-04-03 1980-04-03 Production of clean steel

Country Status (1)

Country Link
JP (1) JPS56139613A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61246312A (en) * 1985-04-25 1986-11-01 Nippon Steel Corp Method for controlling form of inclusion in molten steel in ladle
EP0696645A1 (en) 1994-06-14 1996-02-14 Kawasaki Steel Corporation Method of manufacturing steel containing Ca
JP2010180424A (en) * 2009-02-03 2010-08-19 Sumitomo Metal Ind Ltd Steel material superior in toughness at heat-affected zone in high-heat-input weld, and manufacturing method therefor
JP2010280933A (en) * 2009-06-03 2010-12-16 Sumitomo Metal Ind Ltd Method for manufacturing calcium-treated steel
CN104451346A (en) * 2014-11-29 2015-03-25 首钢总公司 Smelting method of yield 345MPa grade hydrogen cracking-resistant container steel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61246312A (en) * 1985-04-25 1986-11-01 Nippon Steel Corp Method for controlling form of inclusion in molten steel in ladle
EP0696645A1 (en) 1994-06-14 1996-02-14 Kawasaki Steel Corporation Method of manufacturing steel containing Ca
US5609199A (en) * 1994-06-14 1997-03-11 Kawasaki Steel Corporation Method of manufacturing steel containing Ca
JP2010180424A (en) * 2009-02-03 2010-08-19 Sumitomo Metal Ind Ltd Steel material superior in toughness at heat-affected zone in high-heat-input weld, and manufacturing method therefor
JP2010280933A (en) * 2009-06-03 2010-12-16 Sumitomo Metal Ind Ltd Method for manufacturing calcium-treated steel
CN104451346A (en) * 2014-11-29 2015-03-25 首钢总公司 Smelting method of yield 345MPa grade hydrogen cracking-resistant container steel

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