US3329495A - Process for measuring the value of carbon content of a steel bath in an oxygen top-blowing converter - Google Patents

Process for measuring the value of carbon content of a steel bath in an oxygen top-blowing converter Download PDF

Info

Publication number
US3329495A
US3329495A US398337A US39833764A US3329495A US 3329495 A US3329495 A US 3329495A US 398337 A US398337 A US 398337A US 39833764 A US39833764 A US 39833764A US 3329495 A US3329495 A US 3329495A
Authority
US
United States
Prior art keywords
value
carbon content
steel
amount
waste gas
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
US398337A
Other languages
English (en)
Inventor
Ohta Takayoshi
Akuta Tomohiko
Yoshizumi Hideo
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.)
Yawata Iron and Steel Co Ltd
Yokoyama Engineering Co Ltd
Original Assignee
Yawata Iron and Steel Co Ltd
Yokoyama Engineering 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 Yawata Iron and Steel Co Ltd, Yokoyama Engineering Co Ltd filed Critical Yawata Iron and Steel Co Ltd
Application granted granted Critical
Publication of US3329495A publication Critical patent/US3329495A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/202—Constituents thereof
    • G01N33/2022—Non-metallic constituents
    • G01N33/2025—Gaseous constituents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/205—Metals in liquid state, e.g. molten metals

Definitions

  • FIG. I a E 1A: in 1 n 1 "flIr- Time (in minufes) lNVENTORS Tokcyoshi Ohio Tomohiko Aku'ku Minoru Nishiwoki Hideo Yoshizumi dad/W July 4, 1967 TAKAYOSHI OHTA ETAL PROCESS FOR MEASURING THE VALUE OF CARBON CONTENT OF A STEEL BATH IN AN OXYGEN TOP-BLOWING CONVERTER Filed Sept.
  • This invention relates to a process for measuring the value of carbon content of a steel bath in an oxygen top-blowing converter during the blowing operation.
  • the inventors have discovered a method of simply and precisely measuring the value of carbon content of a steel bath in an oxygen top-blowing converter.
  • An object of the present invention is to provide a method of making the value of the carbon content of a steel bath in an oxygen top-blowing converter at the time of tapping steel therefrom coincide with a predetermined target value of the steel bath by measuring the value of carbon content which, in turn, is accomplished by detecting the amount of flow of waste gas issued from the converter and the amounts of carbon monoxide and carbon dioxide contained in said waste gas.
  • Another object of the present invention is to provide a method of precisely measuring the value of carbon content of a steel bath in the converter by detecting the amount of flow of waste gas issued from the converter and the amounts of carbon monoxide and carbon dioxide contained in said waste gas and further compensating for the amount of decarburization of the steel bath at the time when a peculiar change occurs in the decarburizing velocity.
  • FIGURE 1a is a diagram showing the relation between the value of carbon content of a steel bath and the time.
  • FIGURE 1b is a diagram showing the relation between the decarburizing velocity and the time.
  • FIGURE 1c is a diagram showing the relation between the decarburizing acceleration and the time.
  • FIGURE 2 is a system diagram of the present invention.
  • One of the practical applications of the present invention is as follows: From a waste gas issued from an oxygen top-blowing converter, the decarburizing velocity is detected by measuring the amount of flow of said waste gas issued from the converter and the compositions of said waste gas, then by integrating the thus detected decarburizing velocity, the amount of decarburization of a ice steel bath at a certain time after ignition may be calculated. Since the total amount of carbon content of the material charged in the converter may be calculated, the value of carbon content of the steel bath may be easily calculated by subtracting said amount of decarburization of the steel bath from the total amount of carbon content of the material.
  • (CO), (percent) and (CO (percent) designate the concentrations of carbon monoxide and carbon dioxide obtained by analyzing the waste gas caught at t, minutes after the ignition.
  • the amount of decarburization for t, minutes after the ignition, AC may be calculated, for instance, by continuously integrating the value given by the Formula 1 by means of an electronic integrating circuit or by carrying out an addition ofthe value of microtime by means of an electronic computer.
  • AC will be here calculated by integrating the value of each minute, as shown by the following formula:
  • the total amount of carbon, 2C (kg), contained in the charged steel-manufacturing material, which comprises, for instance, pig iron and scrap, may be .shown by the following formula:
  • the blowing operation may be automatically controlled. That is, the blowing operation may be stopped just immediately before the calculated value of carbon content will coincide with the predetermined target value thereof, whereby the end point of blowing may be scientifically and automatically found in combination with a computing control device.
  • FIGURE 11 shows an example of the change in the value of canbon content of the steel bath with the progress of blowing.
  • FIGURE 11) shows an example of the change in the decarburizing velocity, and
  • FIGURE an example of the change in the decarburizing acceleration.
  • the amount of decarburization AC (kg) at t, minutes after the ignition, as determined by the Formula 2 is represented by the area of the hatched part in FIGURE 1b. If the amount of AC, (kg) is to be expressed in the term of carbon content (percent) of the steel bath, it will be represented by the length of the segment A A, in FIGURE 1a.
  • the segment HA obtained by subtracting the segment A A from the segment m1, in FIGURE 1a represents the C (percent) of the Formula 4.
  • the value of carbon content of the steel bath may be automatically calculated at any time during the blowing operation.
  • the ratio of change in the decarburizing velocity at each moment that is, the decarburizing acceleration calculated from the decarburizing velocity
  • t t and t represent the time after ignition, at which the value of the decarburizing acceleration shows a change in the direction of its signal or a value greater that the predetermined one.
  • the values of the decarburizing velocity corresponding to the times t t and t in FIGURE 1b show the abrupt changes. According to runs made by the inventors it was discovered that, in general, the decarburizing velocity and decarburizing acceleration at any time are closely correlated with the carbon content of the steel bath at the corresponding time.
  • the value of the carbon content of the steel bath at the above mentioned times 1 t and t correspond to C (percent), C (percent) and C (percent), respectively, and these values show originally the specific inherent values according to the type of the converter, the blowing conditions and the kind of steel.
  • the decarburizing velocity is continuously measured during the blowing operation according to Formula 1 as above mentioned and then the decarburizing acceleration, that is, the ratio of change in the decarburizing velocity at each moment, is also continuously calculated from the decarburizing velocity, by means of, for instance, an electronic computor or an electronic circuit, whereby the times at which peculiar points in the curves of the decarburizing velocity and decarburizing acceleration appear, that is, t t t in FIGURE 11) or FIGURE 1c may be detected. If such points are detected, the exact value of the carbon content of the steel bath at the corresponding time may be obtained on the basis of the relation shown in FIGURE 1a which is predetermined according to the type of the converter, the blowing conditions and the kinds of the steel.
  • the decarburizing velocity calculated by Formula 1 is continuously differentiated by means of, for instance, an electronic computor or an electronic computing circuit to obtain the decarburizing acceleration, d c/dl If such a peculiar change occurs, in which the calculated value of the decarburizing acceleration exceeds a certain predetermined value or shows a change in the direction of its signal, an electric control signal is automatically issued from an electric control device at that time.
  • the predetermined standard value of carbon content of the steel bat-h [C] percent corresponding to the time, at which the above mentioned peculiar change is detected, is put into a coverting mechanism.
  • the total carbon weight 230 of the charged material iron and weight of the molten steel have already been memorized.
  • the amount of decarburization AC which includes errors obtained by integrating the Formula 2 are cancelled and replaced by the correct amount of decar-burization AC given by the Formula 5.
  • the value of carbon content incorrectly measured is compensated to the correct one of carbon content set by an electric control device or an electronic computor.
  • the subsequent integrating calculation may be continued by using this value as an initial value.
  • a process for tapping steel from an oxygen top-blowing converter said steel having a predetermined carbon content, which comprises measuring the amount of waste gas issued from said converter, measuring the amount of carbon monoxide and carbon dioxide contained in said waste gas, calculating the decarburization velocity from the amount of waste gas and the amount of carbon monoxide and carbon dioxide in said waste gas in accordance with the following formula wherein is the decarburizing velocity, F is the amount of waste gas, (CO) is the amount of carbon monoxide in said waste gas, and (CO is the amount of carbon dioxide in said waste gas; differentiating the said decarburization velocity thereby obtaining the decarburizing acceleration, noting any changes in the value of said decarburizing acceleration, calculating the carbon content of the steel at the time of said changes, and tapping the steel at the exact time the carbon centent of the steel reaches a predetermined value.
  • a process for tapping steel from an oxygen topblowing converter said steel having a predetermined carbon content, which comprises (a) measuring the amount of waste gas issued from said converter and the amounts of carbon monoxide and carbon dioxide contained in said waste gas,

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
US398337A 1963-09-26 1964-09-22 Process for measuring the value of carbon content of a steel bath in an oxygen top-blowing converter Expired - Lifetime US3329495A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5139463 1963-09-26

Publications (1)

Publication Number Publication Date
US3329495A true US3329495A (en) 1967-07-04

Family

ID=12885705

Family Applications (1)

Application Number Title Priority Date Filing Date
US398337A Expired - Lifetime US3329495A (en) 1963-09-26 1964-09-22 Process for measuring the value of carbon content of a steel bath in an oxygen top-blowing converter

Country Status (5)

Country Link
US (1) US3329495A (enrdf_load_stackoverflow)
AT (1) AT278881B (enrdf_load_stackoverflow)
BE (1) BE653544A (enrdf_load_stackoverflow)
DE (1) DE1433701B2 (enrdf_load_stackoverflow)
GB (1) GB1087053A (enrdf_load_stackoverflow)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3432288A (en) * 1966-06-29 1969-03-11 Allegheny Ludlum Steel Process control of top-blown oxygen converter
US3450867A (en) * 1966-03-14 1969-06-17 Leeds & Northrup Co Estimated tap temperature calculator for basic oxygen furnace
US3463631A (en) * 1963-12-03 1969-08-26 Siderurgie Fse Inst Rech Method and arrangement for determining the oxidation reactions during refining of metals
US3475599A (en) * 1965-03-30 1969-10-28 Leeds & Northrup Co Process measurement system for basic oxygen refining of steel
US3485619A (en) * 1965-10-04 1969-12-23 Beteiligungs & Patentverw Gmbh Method of automatic control and adjustment of oxygen blowing processes
US3489518A (en) * 1966-11-02 1970-01-13 Koppers Co Inc Carbon determination method and apparatus
US3500029A (en) * 1967-08-17 1970-03-10 Leeds & Northrup Co Charge computer for basic oxygen furnace
US3510262A (en) * 1966-09-16 1970-05-05 United States Steel Corp Carbon analyzing system
US3520657A (en) * 1965-12-27 1970-07-14 Dravo Corp Method and apparatus for the analysis of off-gases in a refining process
US3528800A (en) * 1966-02-14 1970-09-15 Leeds & Northrup Co Optimized blowing control for basic oxygen furnaces
US3534143A (en) * 1968-10-25 1970-10-13 Westinghouse Electric Corp Computer control of metal treatment furnace operation
US3533778A (en) * 1966-04-20 1970-10-13 Centre Nat Rech Metall Automatic control of pig iron refining
US3540879A (en) * 1967-06-27 1970-11-17 Westinghouse Electric Corp Method for controlling phosphorus removal in a basic oxygen furnace
US3607230A (en) * 1969-01-21 1971-09-21 Koppers Co Inc Process for controlling the carbon content of a molten metal bath
US3619174A (en) * 1965-11-27 1971-11-09 Sumitomo Metal Ind Method for controlling the carbon content in and/or the temperature of the steel
US3640119A (en) * 1966-02-14 1972-02-08 Leeds & Northrup Co Carbon content measurement in a basic oxygen furnace
US3653650A (en) * 1968-12-27 1972-04-04 Yawata Iron & Steel Co Method of controlling the exhaust gas flow volume in an oxygen top-blowing converter
US3720404A (en) * 1967-06-27 1973-03-13 Westinghouse Electric Corp System for controlling carbon removal in a basic oxygen furnace
US3773497A (en) * 1972-03-02 1973-11-20 Steel Corp Steelmaking
US3779744A (en) * 1972-04-05 1973-12-18 Westinghouse Electric Corp Modification and improvement to dynamic bof control
US3816720A (en) * 1971-11-01 1974-06-11 Union Carbide Corp Process for the decarburization of molten metal
US4073619A (en) * 1974-10-28 1978-02-14 British Steel Corporation Sampling gas for analysis
US4187541A (en) * 1977-06-13 1980-02-05 Institut Kibernetiki Akademii Nauk Ukrainskoi Ssr Digital analyzer for determining liquidus temperature of metals and alloys
US4190888A (en) * 1977-06-13 1980-02-26 Institut Kibernetiki Akademii Nauk Ukrainskoi S S R Digital device for determining carbon content in iron-carbon melts
US4198679A (en) * 1977-06-28 1980-04-15 Institut Kibernetiki Akademii Nauk Ukrainskoi Ssr Method and device for discriminating thermal effect of phase transformation of metals and alloys in the process of their cooling
CN113009103A (zh) * 2019-12-19 2021-06-22 上海梅山钢铁股份有限公司 一种转炉炉口含碳量的在线计算方法
CN113106188A (zh) * 2021-04-09 2021-07-13 福建三宝钢铁有限公司 一种hrb500e含铌钛合金螺纹钢的制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5442323A (en) * 1977-09-10 1979-04-04 Nisshin Steel Co Ltd Control procedure of steel making process using mass spectormeter
CN113076505B (zh) * 2020-01-05 2024-06-04 上海梅山钢铁股份有限公司 一种转炉钢水脱碳速率计算方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595792A (en) * 1950-05-26 1952-05-06 Jordan James Fernando Method of observing and controlling the process of a continuous bessemer process
US3218842A (en) * 1963-04-30 1965-11-23 United States Steel Corp Apparatus for analyzing cement kiln exit gases

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595792A (en) * 1950-05-26 1952-05-06 Jordan James Fernando Method of observing and controlling the process of a continuous bessemer process
US3218842A (en) * 1963-04-30 1965-11-23 United States Steel Corp Apparatus for analyzing cement kiln exit gases

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463631A (en) * 1963-12-03 1969-08-26 Siderurgie Fse Inst Rech Method and arrangement for determining the oxidation reactions during refining of metals
US3475599A (en) * 1965-03-30 1969-10-28 Leeds & Northrup Co Process measurement system for basic oxygen refining of steel
US3485619A (en) * 1965-10-04 1969-12-23 Beteiligungs & Patentverw Gmbh Method of automatic control and adjustment of oxygen blowing processes
US3619174A (en) * 1965-11-27 1971-11-09 Sumitomo Metal Ind Method for controlling the carbon content in and/or the temperature of the steel
US3520657A (en) * 1965-12-27 1970-07-14 Dravo Corp Method and apparatus for the analysis of off-gases in a refining process
US3528800A (en) * 1966-02-14 1970-09-15 Leeds & Northrup Co Optimized blowing control for basic oxygen furnaces
US3640119A (en) * 1966-02-14 1972-02-08 Leeds & Northrup Co Carbon content measurement in a basic oxygen furnace
US3450867A (en) * 1966-03-14 1969-06-17 Leeds & Northrup Co Estimated tap temperature calculator for basic oxygen furnace
US3533778A (en) * 1966-04-20 1970-10-13 Centre Nat Rech Metall Automatic control of pig iron refining
US3432288A (en) * 1966-06-29 1969-03-11 Allegheny Ludlum Steel Process control of top-blown oxygen converter
US3510262A (en) * 1966-09-16 1970-05-05 United States Steel Corp Carbon analyzing system
US3489518A (en) * 1966-11-02 1970-01-13 Koppers Co Inc Carbon determination method and apparatus
US3720404A (en) * 1967-06-27 1973-03-13 Westinghouse Electric Corp System for controlling carbon removal in a basic oxygen furnace
US3540879A (en) * 1967-06-27 1970-11-17 Westinghouse Electric Corp Method for controlling phosphorus removal in a basic oxygen furnace
US3500029A (en) * 1967-08-17 1970-03-10 Leeds & Northrup Co Charge computer for basic oxygen furnace
US3534143A (en) * 1968-10-25 1970-10-13 Westinghouse Electric Corp Computer control of metal treatment furnace operation
US3653650A (en) * 1968-12-27 1972-04-04 Yawata Iron & Steel Co Method of controlling the exhaust gas flow volume in an oxygen top-blowing converter
US3607230A (en) * 1969-01-21 1971-09-21 Koppers Co Inc Process for controlling the carbon content of a molten metal bath
US3816720A (en) * 1971-11-01 1974-06-11 Union Carbide Corp Process for the decarburization of molten metal
US3773497A (en) * 1972-03-02 1973-11-20 Steel Corp Steelmaking
US3779744A (en) * 1972-04-05 1973-12-18 Westinghouse Electric Corp Modification and improvement to dynamic bof control
US4073619A (en) * 1974-10-28 1978-02-14 British Steel Corporation Sampling gas for analysis
US4187541A (en) * 1977-06-13 1980-02-05 Institut Kibernetiki Akademii Nauk Ukrainskoi Ssr Digital analyzer for determining liquidus temperature of metals and alloys
US4190888A (en) * 1977-06-13 1980-02-26 Institut Kibernetiki Akademii Nauk Ukrainskoi S S R Digital device for determining carbon content in iron-carbon melts
US4198679A (en) * 1977-06-28 1980-04-15 Institut Kibernetiki Akademii Nauk Ukrainskoi Ssr Method and device for discriminating thermal effect of phase transformation of metals and alloys in the process of their cooling
CN113009103A (zh) * 2019-12-19 2021-06-22 上海梅山钢铁股份有限公司 一种转炉炉口含碳量的在线计算方法
CN113106188A (zh) * 2021-04-09 2021-07-13 福建三宝钢铁有限公司 一种hrb500e含铌钛合金螺纹钢的制备方法

Also Published As

Publication number Publication date
AT278881B (de) 1970-02-10
DE1433701B2 (de) 1971-02-25
GB1087053A (en) 1967-10-11
BE653544A (enrdf_load_stackoverflow) 1965-01-18
DE1433701A1 (de) 1968-11-28

Similar Documents

Publication Publication Date Title
US3329495A (en) Process for measuring the value of carbon content of a steel bath in an oxygen top-blowing converter
JPS6232248B2 (enrdf_load_stackoverflow)
CN111485056A (zh) 一种在线测量转炉渣层厚度的方法
Widlund et al. Towards model-based closed-loop control of the basic oxygen steelmaking process
KR20000045516A (ko) 전로 조업에서 용강중 탄소농도 예측방법 및장치
CA1118212A (en) Method for converter blow control
US3669645A (en) Method for operating an oxygen top-blowing converter
Meyer et al. Static and dynamic control of the basic oxygen process
US3551140A (en) Controlled refining of pig iron
US3652262A (en) Refining of pig iron
US3607230A (en) Process for controlling the carbon content of a molten metal bath
JPS55125217A (en) Slag forming control method in converter
US3566671A (en) Process measurements in oxygen blown steel refining furnaces during the finish blow phase
KR100399223B1 (ko) 전로조업에서용강중탄소농도제어방법및제어장치
JPS57131310A (en) Method for controlling content of phosphorus of molten steel
KR102133215B1 (ko) 용선 예비 처리 방법 및 용선 예비 처리 제어 장치
US3661559A (en) Metallurgical process control of oxygen content
JPS5792121A (en) Method for estimation of phosphorus concentration of steel bath
JPH0675037B2 (ja) 溶鉄成分の検出方法およびそれに基づく精錬方法
JPS5941409A (ja) 吹錬制御方法
JPH07118723A (ja) 転炉精錬法
JPH0741813A (ja) 転炉精錬方法
JPH06271921A (ja) 鋼浴中の燐濃度推定方法
JPS6318015A (ja) 転炉吹錬におけるマンガン濃度の推定方法
JPH01263213A (ja) サブランス地金付き防止方法