Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
  • B22D11/055—Cooling the moulds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
  • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

• ABSTRACT A process for the continuous casting of steel for the manufacture of grain-oriented electrical sheet, in strip or in sheets, wherein a primary cooling water and a secondary cooling water is used, characterized in that the primary cooling water is maintained at the minimum value compatible with not damaging the mould and with the attainment of a sufficient mechanical strength in the outer shell of the output slab.
• the present invention relates to a continuous casting process for silicon steel suitable to make grain-oriented electrical sheet in strip or sheet form.
• the influence shown by the composition, the dimensions and thedistribution of the impurities in the grain orientation process is known; when the additive selected for this purpose is the sulphur, it is observed that due to the particular solidifying conditions occurring in the continuous casting, the distribution, composition and shape of the sulphides is such that a Bauman etching made on a continuous cast slab gives an almost invisible image of the distribution of said sulphides, contrarily to the result obtained from the Bauman etchings of the slabs, obtained from an ingot.
• the purpose of the present invention is that of speci fying the critical variable values intervening during the continuous casting of said silicon steels, so as to attain a final product having an optimum and reproducible quality.
• said critical conditions if respected, allow to obtain slabs which, when submitted to conventional subsequent working cycles, will originate a final product having magnetic features at least comparable to those obtainable by using conventional ingot cast steel. For instance, for a sheet 0.35 mm thick, the loss measured at 50 Hz and 15,000 Gauss is less than or equal to 1.11 Watt/kg and the permeability measured at Oersted is greater than, or equal to, 1790 Gauss/Oersted.
• the molten steel to which all substances capable of imparting to it the desired magnetic features have been added is stirred within the ladle, by blowing argon through it so that it will have at the start of the casting a temperature cornprised between 1,560C and 1,600C, preferably a temperature comprised between 1,560C and 1,570C.
• the casting is made by means of submerged nozzles from the ladle to the tundish and therefrom to the molds, and the molten metal is protected by a slag consisting essentially of CaO, SiO A1 0 CaF-Z.
• the molten metal is cast so as to have a feeding speed of the slab included between 700 and 1,000 kg/min, and for slabs of 900 X 140 mm the feed speed is about 800 ltg/rnin.
• the primary cooling water of the continuous casting plant has the minimum possible flowing rate so as to ensure the sealing of the mold and a sufficient mechanical strength of the solidified outer shell of the slab in order to allow for its extraction with no break.
• the primary cooling water has a flow rate comprised between 2.8 and 4 cu.m/ton of steel; for a slab of 900 X 140 mm the water flow rate must be not greater than 3.6 cu.M/ton of steel.
• the secondary cooling water of the continuous casting plant, sprayed along a variable number of zones will have such a flow rate as to allow for the minimum possible removal of heat in order to have at the extraction rolls of the machine, the cross sectional area of the slab entirely solidified.
• Said water flow rates are comprised between 0.16 and 0.24 cutm/ton of steel in the first of said zones, while in the other zones the rate will be included between 0.04 and 0.10 cum/ton.
• the so obtained slabs are stacked and left to slowly cool in still air. After working the final sheet has the features as follows: 0.35 mm thick, loss at 50 Hz and 15,000 Gauss equal to 0.95 watt/kg and permeability at 10 Oersted equal to 1810 Gauss/Oersted.
• the sulphur contents of the continuously cast steel according to the present invention equals percent by weight of the sulphur contained :in the corresponding type of the ingot-cast steel.
• the carbon contents of the continuously cast steel according to the process of the present invention is higher by 0.01 percent by weight than that of the corresponding type of steel conventionally teemed into ingot molds.
• a process for the continuous casting of silicon steel for the manufacture of grain-oriented electrical sheet and strip comprising casting silicon steel into a continuous casting mold at a temperature between 1,560C. and 1,600C., cooling the mold by passing through the mold primary water at a flow rate less than 3.6 cubic meters per ton of steel, spraying on the slab that emerges from the mold secondary cooling waterin a first zone at a rate between 0.16 and 0.24 cubic meter per ton of steel, and spraying on said slab which 5.
• the steel contains sulphur in an amount about percent of the sulphur contained in the corresponding type of steel conventionally teemed into ingot molds.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Continuous Casting (AREA)
• Manufacturing Of Steel Electrode Plates (AREA)
• Heat Treatment Of Sheet Steel (AREA)
• Soft Magnetic Materials (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=11273859

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (2)

Citations (7)

Family Cites Families (1)

• 1970
  • 1970-12-28 US US00102038A patent/US3727669A/en not_active Expired - Lifetime
  • 1970-12-29 CA CA101,564A patent/CA944126A/en not_active Expired
• 1971
  • 1971-01-13 DE DE19712101401 patent/DE2101401B2/de active Pending
  • 1971-01-18 FR FR7101468A patent/FR2090117B1/fr not_active Expired
  • 1971-02-04 BE BE762520A patent/BE762520A/xx not_active IP Right Cessation
  • 1971-02-24 NL NL7102429.A patent/NL159305B/xx not_active IP Right Cessation
  • 1971-03-04 LU LU62730D patent/LU62730A1/xx unknown
  • 1971-03-25 JP JP1756171A patent/JPS5423893B1/ja active Pending
  • 1971-04-19 GB GB2385771*A patent/GB1346309A/en not_active Expired

Patent Citations (7)

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