US3572124A - Apparatus for simultaneous determination of carbon-temperature in liquid steel during blowing - Google Patents

Apparatus for simultaneous determination of carbon-temperature in liquid steel during blowing Download PDF

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Publication number
US3572124A
US3572124A US815955A US81595569A US3572124A US 3572124 A US3572124 A US 3572124A US 815955 A US815955 A US 815955A US 81595569 A US81595569 A US 81595569A US 3572124 A US3572124 A US 3572124A
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US
United States
Prior art keywords
vessel
temperature
molten steel
bath
liquid steel
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.)
Expired - Lifetime
Application number
US815955A
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English (en)
Inventor
Noriyoshi Nagaoka
Genichi Usui
Akichika Ozeki
Moriyuki Ishiguro
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
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 Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Application granted granted Critical
Publication of US3572124A publication Critical patent/US3572124A/en
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S73/00—Measuring and testing
    • Y10S73/09—Molten metal samplers

Definitions

  • One method involves dropping a sampling vessel 1 into the molten steel through a throat into the furnace, causing the molten steel to enter the vessel, immediately raising the vessel and measuring the bath temperature by means of a thermocouple therein, as shown in FIGS. 1 through 4.
  • the lead-in wire connected to a measuring instrument has a two circuit structure as shown in FIG. 4, it is subject to melting or short circuiting from exposure to the combustion flame in the furnace, and to the hot "ice slag layer and molten steel. Thus, it is impossible to provide a measurement compensation. Further, in order to repeatedly use said wire, considerable time delays are required. Thus, the operating eliiciency of the drop-in thermocouple is very low.
  • Another object of this invention is to provide a novel sampling vessel which prevents molten steel from running into said vessel until the vessel is immersed in the molten steel bath.
  • an apparatus for simultaneous determination of carbon content and temperature of molten steel bath during blowing comprising a sampling vessel having an aperture through its side wall, a first thermocouple in the botom of said vessel, 2. second thermocouple on the outside of the bottom of said vessel, an auxiliary lance to support said sampling vessel, means to eject gas through said aperture via said auxiliary lance and a stopper made of porous materials provided at the upper portion of said sampling vessel which permits free flow of said gas but which presents counterflow of molten steel.
  • FIG. 1 shows a schematic view of a prior art apparatus for measuring carbon content and temperature in molten steel
  • FIG. 5 shows a longitudinal sectional view of a vessel embodying this invention
  • FIG. 6 shows a manner of utilizing the vessel for BOF
  • FIG. 8 is a curve to show the variation in the temperature of the molten steel bath.
  • thermocouples 5 and 7 are covered with shields 9 of metal or other refractory material to stabilize thermocouples 5 and 7.
  • a layer having a temperature different from that of the molten steel covers the molten steel. Consequently, when said vessel is immersed into the bath, the slag may enter into said vessel and hinder accurate measurement of the bath tempera ture.
  • a suitable gas such as air is ejected outwardly through said aperture 3 from the inlet port 11 provided at the upper end of said vessel 10, such an air-purge being carried out through an inner tube of the auxiliary lance 2 connected to the above detector 1.
  • the novel apparatus is lowered into the bath with air being purged through lance 2.
  • the apparatus passes through the slag layer and then reaches a desired depth of the bath.
  • a suitable stopper 17 is provided at the upper portion of the inlet 11 to prevent the molten steel in said vessel from counter-flowing toward the auxiliary lance.
  • the stopper 17 can protect a connector 15 and the compensating lead wires 16, which are connected to auxiliary lance 2 by a proper steel tube via connection 18, from being damaged.
  • the stopper 17 is made of a porous refractory material or of a permeable material to provide free flow of said purging air, while preventing counter-flow of said liquid steel up into lance 2.
  • Apparatus for simultaneous determination of carbon tent and temperature of molten steel during blowing comprising a sampling vessel having an aperture through its side wall;
  • thermocouples are independent and are connected to independent indicators with compensating lead wires extending through said auxiliary lance.
  • sampling vessel is provided with a paper sleeve and is covered with metal or other refractory material at least near the wall of said side aperture.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
US815955A 1968-04-15 1969-04-14 Apparatus for simultaneous determination of carbon-temperature in liquid steel during blowing Expired - Lifetime US3572124A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP43024890A JPS4942954B1 (de) 1968-04-15 1968-04-15

Publications (1)

Publication Number Publication Date
US3572124A true US3572124A (en) 1971-03-23

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ID=12150767

Family Applications (1)

Application Number Title Priority Date Filing Date
US815955A Expired - Lifetime US3572124A (en) 1968-04-15 1969-04-14 Apparatus for simultaneous determination of carbon-temperature in liquid steel during blowing

Country Status (7)

Country Link
US (1) US3572124A (de)
JP (1) JPS4942954B1 (de)
AT (1) AT307104B (de)
CA (1) CA911196A (de)
FR (1) FR2009821A1 (de)
GB (1) GB1237023A (de)
SE (1) SE341088C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141249A (en) * 1977-03-14 1979-02-27 Nippon Kokan Kabushiki Kaisha Sub-lance assembly for sampling and temperature-measuring of molten metal during refining
US4290306A (en) * 1979-03-05 1981-09-22 Kawasaki Jukogyo Kabushiki Kaisha Method and apparatus for probing into a refining furnace or the like for temperature measurement for sampling, or for both
US4569237A (en) * 1984-04-16 1986-02-11 Electro-Nite Co. Method of sampling molten metal
US4615225A (en) * 1985-03-13 1986-10-07 Allied Corporation In-situ analysis of a liquid conductive material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141249A (en) * 1977-03-14 1979-02-27 Nippon Kokan Kabushiki Kaisha Sub-lance assembly for sampling and temperature-measuring of molten metal during refining
US4290306A (en) * 1979-03-05 1981-09-22 Kawasaki Jukogyo Kabushiki Kaisha Method and apparatus for probing into a refining furnace or the like for temperature measurement for sampling, or for both
US4569237A (en) * 1984-04-16 1986-02-11 Electro-Nite Co. Method of sampling molten metal
US4615225A (en) * 1985-03-13 1986-10-07 Allied Corporation In-situ analysis of a liquid conductive material

Also Published As

Publication number Publication date
SE341088B (sv) 1971-12-13
AT307104B (de) 1973-05-10
DE1919117A1 (de) 1969-12-11
FR2009821A1 (de) 1970-02-13
CA911196A (en) 1972-10-03
SE341088C (sv) 1973-04-30
GB1237023A (en) 1971-06-30
JPS4942954B1 (de) 1974-11-18
DE1919117B2 (de) 1974-11-07

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