US3476550A - Method for correcting the temperature of steel at the end of the refining process - Google Patents

Method for correcting the temperature of steel at the end of the refining process Download PDF

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Publication number
US3476550A
US3476550A US563287A US3476550DA US3476550A US 3476550 A US3476550 A US 3476550A US 563287 A US563287 A US 563287A US 3476550D A US3476550D A US 3476550DA US 3476550 A US3476550 A US 3476550A
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US
United States
Prior art keywords
temperature
steel
oxygen
lime
bath
Prior art date
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Expired - Lifetime
Application number
US563287A
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English (en)
Inventor
Jacques Ledune
Gaul Nilles
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.)
Centre de Recherches Metallurgiques CRM ASBL
Vodafone GmbH
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
Mannesmann AG
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.)
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Expired - Lifetime legal-status Critical Current

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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
    • C21C5/32—Blowing from above

Definitions

  • a method for adjusting the temperature of steel in a converter at the end of a refining process consists of adding lime to the metal and blasting in oxygen while causing the converter to rotate about its axis.
  • the present invention concerns a method by which it is possible to correct the temperature of liquid steel :at the,.end of the process of refining pig iron, and in particular phosphorus-containing pig iron.
  • the aim of the present invention is a process making possible an easy and satisfactory correction of the temperature of liquid steel at the end of the refining process, for use in the manufacture of steel by the refining of pig iron, in particular phosphorus-containing pig iron, by means of substantially pure oxygen (hereinafter referred to as oxygen) blasted from above the bath into a solid bottomed converter that can rotate about its longitudinal axis.
  • oxygen substantially pure oxygen
  • the method of the invention consists essentially in that at the end of the refining operation the temperaure of the metallic bath is regulated by the addition of lime and by blasting with oxygen while the converter is rotating about its longitudinal axis.
  • the addition of lime to the steel leads to a cooling of the metal that can be calenlisted in accordance with the proportions and temperatures of the materials, whereas the blasting with oxygen allows a small rise in the temperature of the bath.
  • the addition of lime simultaneously with the blasting-in of oxygen accordingly makes it possible to regulate the temperature accurately, as the contrary efiects of the two actions allow easy checking of the operation of correcting the temperature of the bath.
  • the application of the present method is of particular interest when refining takes place in two separate phases by deslagging, with the converter rotating about its longitudinal axis during the second phase, and is also of interest when the refining operation is conducted without intermediate deslagging, in a single phase, at the end of which the converter is caused to rotate about its longitudinal axis, the single deslagging operation constituting the final deslagging.
  • a determined temperature correction can be carried out by keeping the oxygen rate of flow fixed, and by regulating the amount of lime added, or by keeping the amount of lime to be added to the bath at a fixed rate, and by regulating the rate of flow of the oxygen.
  • oxygen and lime are added to the bath through the same lance, thus making it possible to avoid the introduction of undesirable nitrogen at the teeming pot.
  • the amounts of lime and of oxygen that is necessary to add to or to blast into the steel to correct its temperature can be determined from charts such as the one shown in the accompanying drawing.
  • the temperature deviations (in degrees centigrade) in relation to the desired temperature of the steel at the end of the refining process are plotted on the abscissa in this diagram, whilst on the ordinate the amounts of lime are shown, which it is necessary to add to the steel to reduce the said deviations.
  • the said amounts are a function of the rates of flow of oxygen blasted into the bath, and are shown on the chart by the straight lines B (no blasting of oxygen) and A (rate of flow of 50 mfi/minute).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US563287A 1965-07-07 1966-07-06 Method for correcting the temperature of steel at the end of the refining process Expired - Lifetime US3476550A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
LU49012 1965-07-07
BE672472A BE672472A (no) 1965-07-07 1965-11-17
LU50072 1965-12-15

Publications (1)

Publication Number Publication Date
US3476550A true US3476550A (en) 1969-11-04

Family

ID=27159126

Family Applications (1)

Application Number Title Priority Date Filing Date
US563287A Expired - Lifetime US3476550A (en) 1965-07-07 1966-07-06 Method for correcting the temperature of steel at the end of the refining process

Country Status (7)

Country Link
US (1) US3476550A (no)
BE (2) BE672472A (no)
DE (1) DE1508132A1 (no)
FR (1) FR1514959A (no)
GB (1) GB1094345A (no)
LU (2) LU49012A1 (no)
NL (1) NL6609511A (no)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101312A (en) * 1975-11-14 1978-07-18 Nippon Steel Corporation Method for operation of a converter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB492740A (en) * 1936-12-21 1938-09-21 Herman Alexander Brassert Improvements in and relating to the dephosphorising and/or desulphurising of steel
GB904868A (en) * 1958-04-26 1962-08-29 Arbed Process for making steel
US3076703A (en) * 1958-04-28 1963-02-05 Arbed Manufacture of steel
US3136626A (en) * 1960-08-19 1964-06-09 Lorraine Laminage Method of refining cast-iron
GB1007410A (en) * 1963-07-24 1965-10-13 Huettenwerk Oberhausen Ag Improvements in or relating to the conversion of high-phosphorus pig irons to steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB492740A (en) * 1936-12-21 1938-09-21 Herman Alexander Brassert Improvements in and relating to the dephosphorising and/or desulphurising of steel
GB904868A (en) * 1958-04-26 1962-08-29 Arbed Process for making steel
US3076703A (en) * 1958-04-28 1963-02-05 Arbed Manufacture of steel
US3136626A (en) * 1960-08-19 1964-06-09 Lorraine Laminage Method of refining cast-iron
GB1007410A (en) * 1963-07-24 1965-10-13 Huettenwerk Oberhausen Ag Improvements in or relating to the conversion of high-phosphorus pig irons to steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101312A (en) * 1975-11-14 1978-07-18 Nippon Steel Corporation Method for operation of a converter

Also Published As

Publication number Publication date
GB1094345A (en) 1967-12-06
FR1514959A (fr) 1968-03-01
BE672472A (no) 1966-05-17
DE1508132A1 (de) 1969-10-23
NL6609511A (no) 1967-01-09
LU50072A1 (no) 1967-06-15
BE683240A (no) 1966-12-27
LU49012A1 (no) 1967-01-09

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