GB986808A - Exothermic charges for producing alloys - Google Patents

Exothermic charges for producing alloys

Info

Publication number
GB986808A
GB986808A GB98862A GB98862A GB986808A GB 986808 A GB986808 A GB 986808A GB 98862 A GB98862 A GB 98862A GB 98862 A GB98862 A GB 98862A GB 986808 A GB986808 A GB 986808A
Authority
GB
United Kingdom
Prior art keywords
chromium
chromite
calcium
oxidized
exothermic
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
Application number
GB98862A
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.)
Pechiney SA
Original Assignee
Pechiney SA
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
Priority claimed from FR849283A external-priority patent/FR1518563A/en
Priority claimed from FR849284A external-priority patent/FR1291565A/en
Application filed by Pechiney SA filed Critical Pechiney SA
Publication of GB986808A publication Critical patent/GB986808A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/003—Making ferrous alloys making amorphous alloys
    • 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
    • C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Chromium-containing alloys are produced by the addition to a metal bath of exothermic charges comprising an intimate mixture of ferrochromium, oxidized chromites, aluminium and one or more of the elements silicon, calcium, manganese, magnesium, and their alloys with each other. The weight of chromium in the ferro-chromium is not less than 60% of the total chromium provided by the charge, while the oxidized chromite contains not less than 16% of chromium, 1-9% of combined sodium and 18-26% of combined calcium. The reducing agent for the chromite may be so constituted that the resultant slag has the composition: .Al2O3.42-45% .CaO.36-40% .MgO.6-8% .SiO2.7-9% .Na2O.4-6% The oxidized chromite is prepared by submitting to a single treatment at 800-1100 DEG C. in the presence of air or oxygen an intimate mixture of chromite ore, sodium carbonate and at least one of calcium oxide, calcium carbonate, magnesia and dolomite, the proportion of sodium carbonate being 15-40% of that stoichiometrically required by the equation: 2 Cr2O3.FeO + 4 Na2CO3 + 4 CaO + 3.5 O2 --> 4 CrO4Na2 + Fe2O3 + 4 CaCO3. The exothermic charge may furthermore contain 4-9 parts of milled fluorspar per 100 parts of chromite.
GB98862A 1961-01-10 1962-01-10 Exothermic charges for producing alloys Expired GB986808A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR849283A FR1518563A (en) 1961-01-10 1961-01-10 Oxidation of chromites
FR849284A FR1291565A (en) 1961-01-10 1961-01-10 Exothermic loads

Publications (1)

Publication Number Publication Date
GB986808A true GB986808A (en) 1965-03-24

Family

ID=26188866

Family Applications (1)

Application Number Title Priority Date Filing Date
GB98862A Expired GB986808A (en) 1961-01-10 1962-01-10 Exothermic charges for producing alloys

Country Status (4)

Country Link
BE (1) BE612493A (en)
DE (1) DE1284977B (en)
GB (1) GB986808A (en)
LU (1) LU41068A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5944914A (en) * 1996-12-04 1999-08-31 Elektro-Thermit Gmbh Aluminothermic mixture with ferrochromium alloy

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2836486A (en) * 1954-03-26 1958-05-27 Union Carbide Corp Exothermic alloy addition agent

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5944914A (en) * 1996-12-04 1999-08-31 Elektro-Thermit Gmbh Aluminothermic mixture with ferrochromium alloy

Also Published As

Publication number Publication date
LU41068A1 (en) 1962-07-09
DE1284977B (en) 1968-12-12
BE612493A (en) 1962-07-10

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