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WO2021090336A1 - Fil fourré innovant ayant au moins deux bandes d'acier plaquées l'une contre l'autre - Google Patents

Fil fourré innovant ayant au moins deux bandes d'acier plaquées l'une contre l'autre Download PDF

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Publication number
WO2021090336A1
WO2021090336A1 PCT/IN2020/050938 IN2020050938W WO2021090336A1 WO 2021090336 A1 WO2021090336 A1 WO 2021090336A1 IN 2020050938 W IN2020050938 W IN 2020050938W WO 2021090336 A1 WO2021090336 A1 WO 2021090336A1
Authority
WO
WIPO (PCT)
Prior art keywords
cored wire
steel
steel strips
liquid
ladle
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.)
Ceased
Application number
PCT/IN2020/050938
Other languages
English (en)
Inventor
Raj Kumar YADAV
Sarbendu Sanyal
J. B. Singh
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.)
JAMIPOL Ltd
Original Assignee
JAMIPOL 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 JAMIPOL Ltd filed Critical JAMIPOL Ltd
Publication of WO2021090336A1 publication Critical patent/WO2021090336A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising

Definitions

  • FIELD OF INVENTION This invention relates to increase in the efficiency due to cladding of one or more steel strips over another which acts as natural insulation due to air gap in between and thereby melting of filler material is delayed.
  • the cored wire consists of filler material covered with one steel strip and cladded with one or more steel strips over the first strip.
  • Steel making is essentially an oxidation process where the impurities of molten metal are preferentially oxidized to join the slag along with fluxes.
  • the major challenge to steel makers is to reduce oxygen and inclusions, which are formed due to subsequent de-oxidation as they may remain intact after casting process & are thus detrimental to the product quality.
  • a cored wire is a continuous steel tube filled with either a calcium bearing material or a ferroalloy material.
  • the steel tube is usually made of a single strip. In general thickness of steel strip used in industry is 0.3-1.2mm for cored wire.
  • the efficiency of calcium treatment of steel melt is measured by the yield (or recovery) of calcium after cored wire injection.
  • This yield of calcium can be defined as the ratio of calcium retained in steel to the amount of calcium injected.
  • the yield of calcium in the cored wire injection process is at the most 40% and sometimes it becomes as low as 2% depending on grades of steel processed and the operating conditions.
  • the low yield of calcium is due to its high vapour pressure and low boiling point (1439°C). As this temperature is lower than the working temperature of liquid steel, calcium vaporizes as soon as it is released in the liquid steel.
  • the calcium yield and its consistency are of paramount importance to the steelmakers for producing high quality steel with least cost.
  • the present invention aims at improving the calcium yield and its consistency and at the same time reduce the cost of cored wire to enable steelmakers with an efficient and cost effective calcium treatment process.
  • the main object of this invention is to improve the efficiency of cored wire. This is by utilising the natural insulation formed while multiple steel strips are cladded together to manufacture the cored wire tube containing the filler material.
  • the cored wire consists of the filler material covered with two or more steel strips cladded together and the air gaps between steel strips act as an insulation.
  • the width of steel strips may vary between 15 mm and 120 mm and thickness of the steel strips may vary between 0.10 mm and 1.20 mm.
  • Calcium addition in liquid steel is done at the end of secondary treatment process i.e. either in ladle furnace or in vacuum degassing unit.
  • the major functions of cored wire are modification of inclusion morphology, deoxidation & desulphurization.
  • Cored wire is used for calcium treatment and for chemistry adjustment to suit the requirement of the next processing unit i.e. casting unit.
  • Calcium treatment has of late become an essential feature of liquid steel processing.
  • Cored wire is injected into the ladle through wire feeder which is capable of feeding cored wire at a very controlled rate into the steel-melts.
  • the efficiency of calcium treatment of steel melt is measured by the yield (or recovery) of calcium after cored wire injection. This yield of calcium can be defined as the ratio of calcium retained in steel to the amount of calcium injected. It is well established that the yield of calcium and other additives is maximum when the material is released from the cored wire very close to the bottom of the ladle.
  • the innovative design of the cored wire coupled with the prescribed injection speed ensures that the material is released close to the bottom of the ladle.
  • the cladding of steel strips creates one or more air gaps, depending on number of steel strips cladded, between them. These air gaps between steel strips act as natural insulation and effectively reduce the conductive heat transfer and thus delay the heating up of the wire. This enables delayed melting of the cored wire and dispersion of the filler material at a higher depth inside the liquid steel bath.
  • Figure 1 describes recovery inlow carbon (LC) and medium carbon (MC) grades of steel for the innovative cored wire over conventional cored wire.
  • Ladle size is in between 150-250MT. In both grades there is over 10% improvement in recovery than conventional product.

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

La présente invention concerne un procédé d'injection de fil fourré visant à introduire des flux et des additifs d'alliage dans un bain d'acier liquide, après réglage de la température du bain et de la chimie de l'acier liquide, dans une unité de traitement secondaire, selon les exigences : caractérisé en ce que lesdits additifs sont libérés à proximité du fond de la poche par injection, à une vitesse prédéterminée, d'un fil fourré préfabriqué de dimensions appropriées, en fonction de la nuance de l'acier liquide, de la température de traitement et de la taille de la poche/hauteur de la colonne de liquide. L'objet principal de la présente invention est d'améliorer l'efficacité du fil fourré. Ceci est réalisé par utilisation de l'isolation naturelle formée lorsque de multiples bandes d'acier sont plaquées l'une contre l'autre pour fabriquer le tube du fil fourré contenant le matériau de remplissage. Le fil fourré est constitué du matériau de remplissage recouvert d'au moins deux bandes d'acier plaquées l'une contre l'autre, les espaces entre les bandes d'acier agissent en tant qu'isolation. La largeur des bandes d'acier peut varier entre 15 mm et 120 mm et l'épaisseur des bandes d'acier peut varier entre 0,10 mm et 1,20 mm.
PCT/IN2020/050938 2019-11-07 2020-11-06 Fil fourré innovant ayant au moins deux bandes d'acier plaquées l'une contre l'autre Ceased WO2021090336A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201931045265 2019-11-07
IN201931045265 2019-11-07

Publications (1)

Publication Number Publication Date
WO2021090336A1 true WO2021090336A1 (fr) 2021-05-14

Family

ID=75849668

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2020/050938 Ceased WO2021090336A1 (fr) 2019-11-07 2020-11-06 Fil fourré innovant ayant au moins deux bandes d'acier plaquées l'une contre l'autre

Country Status (1)

Country Link
WO (1) WO2021090336A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7682418B2 (en) * 2004-02-11 2010-03-23 Tata Steel Limited Cored wire injection process in steel melts

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7682418B2 (en) * 2004-02-11 2010-03-23 Tata Steel Limited Cored wire injection process in steel melts

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