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1. WO1991000928 - METHOD OF DEPHOSPHORIZING CHROMIUM-CONTAINING HOT METAL WITH LOWERED OXIDATION LOSS OF CHROMIUM

Publication Number WO/1991/000928
Publication Date 24.01.1991
International Application No. PCT/JP1990/000842
International Filing Date 28.06.1990
IPC
C21C 1/02 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
1Refining of pig-iron; Cast iron
02Dephosphorising or desulfurising
C21C 5/00 2006.01
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
5Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel
CPC
C21C 1/02
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
1Refining of pig-iron; Cast iron
02Dephosphorising or desulfurising
C21C 5/005
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
5Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel ; or stainless steel
005Manufacture of stainless steel
Applicants
  • NISSHIN STEEL CO., LTD. [JP/JP]; 4-1, Marunouchi 3-chome Chiyoda-ku Tokyo 100, JP (AllExceptUS)
  • NAKAJIMA, Yoshio [JP/JP]; JP (UsOnly)
  • MUKAI, Masato [JP/JP]; JP (UsOnly)
  • FUKUI, Katsunori [JP/JP]; JP (UsOnly)
Inventors
  • NAKAJIMA, Yoshio; JP
  • MUKAI, Masato; JP
  • FUKUI, Katsunori; JP
Agents
  • WADA, Kenji; 83, Ichigayayakuojimachi Shinjuku-ku Tokyo 162, JP
Priority Data
1/17642408.07.1989JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) METHOD OF DEPHOSPHORIZING CHROMIUM-CONTAINING HOT METAL WITH LOWERED OXIDATION LOSS OF CHROMIUM
(FR) PROCEDE DE DEPHOSPHORATION D'UNE FONTE LIQUIDE CONTENANT DU CHROME AVEC ABAISSEMENT DE LA PERTE DE CHROME PAR OXYDATION
Abstract
(EN)
A method of dephosphorizing chromium-containing hot metal without causing the oxidation of chromium, which comprises dispersing a powdery flux containing at least 70 wt% of CaO and CaF2 in total having a CaO to CaF2 ratio of at least 4/6 by weight into an oxygen-containing gas in an O2 to (CaO + CaF2) ratio ranging from 20 to 120 Nl/kg, wherein O2 represents the quantity (Nl) of oxygen in the oxygen-containing gas, and blowing the resulting gas/solid mixture into chromium-containing hot metal below the surface of the hot metal.
(FR)
Le procédé décrit, qui sert à la déphosphoration d'une fonte liquide contenant du chrome sans que cette opération n'entraîne l'oxydation du chrome, consiste à disperser un flux pulvérulent, contenant au moins 70 % en poids de CaO et de CaF2 au total et présentant un rapport CaO/CaF2 égal à au moins 4/6 en poids, dans un gaz contenant de l'oxygène dont le rapport O2/(CaO + CaF2) est compris entre 20 et 120 Nl/kg, où O2 représente la teneur (Nl) en oxygène du gaz contenant de l'oxygène, puis à procéder au soufflage du mélange gaz/matière solide qui en résulte dans la fonte liquide contenant du chrome sous la surface de la fonte liquide.
Also published as
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