EP 0033289 B1 19841128 - PROCESS FOR THE DECARBURISATION OF CHROMIUM CONTAINING MELTS
Title (en)
PROCESS FOR THE DECARBURISATION OF CHROMIUM CONTAINING MELTS
Publication
Application
Priority
FR 8001809 A 19800124
Abstract (en)
[origin: ES8200725A1] A process is disclosed for the decarburization of a molten bath of chromium-containing pig iron which, in a single operation, permits decarburization by means of an oxygen jet and thus permits chromium or nickel chromium steels to be obtained directly, the decarburization of which can readily be completed by a final treatment under vacuum carried out immediately after the injection of oxygen. The process comprises adjusting the temperature conditions of the pig iron bath and regulating the oxygen jet distance from the surface of the bath and speed of oxygen gas so that the impact force of the oxygen creates a gas-metal emulsion within which the carbon contained in the pig iron is oxidized directly by the oxygen. The carbon content is thus rapidly reduced to less than 0.3% whereas the yield of chromium is higher than 97%. The process is suitable for the preparation of all grades of Cr and NiCr stainless steel, which optionally contain additions of Co, Mn or Mo.
IPC 1-7
IPC 8 full level
C21C 5/32 (2006.01); C21C 5/00 (2006.01); C21C 5/28 (2006.01); C21C 7/068 (2006.01)
CPC (source: EP US)
C21C 5/005 (2013.01 - EP US); C21C 7/0685 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE DE GB IT SE
DOCDB simple family (publication)
EP 0033289 A1 19810805; EP 0033289 B1 19841128; AT E10508 T1 19841215; AU 531039 B2 19830804; AU 6630381 A 19810730; BR 8100314 A 19810811; CA 1154967 A 19831011; DE 3167358 D1 19850110; ES 498749 A0 19811101; ES 8200725 A1 19811101; FI 68862 B 19850731; FI 68862 C 19851111; FI 810188 L 19810725; FR 2474531 A1 19810731; FR 2474531 B1 19860814; IN 153729 B 19840811; JP S56116814 A 19810912; NO 810242 L 19810727; PH 16313 A 19830905; SU 1170974 A3 19850730; TR 21061 A 19830613; US 4324584 A 19820413; YU 9681 A 19830430; ZA 81411 B 19820224; ZW 1281 A1 19810415
DOCDB simple family (application)
EP 81420006 A 19810120; AT 81420006 T 19810120; AU 6630381 A 19810119; BR 8100314 A 19810121; CA 368903 A 19810120; DE 3167358 T 19810120; ES 498749 A 19810123; FI 810188 A 19810123; FR 8001809 A 19800124; IN 1349CA1980 A 19801205; JP 855881 A 19810122; NO 810242 A 19810123; PH 24944 A 19801204; SU 3229959 A 19810119; TR 2106181 A 19810113; US 22190380 A 19801231; YU 9681 A 19810116; ZA 81411 A 19810121; ZW 1281 A 19810121