Global Patent Index - EP 0857222 B1

EP 0857222 B1 2000-01-05 - PROCESS FOR DECARBONISING A HIGH-CHROMIUM STEEL MELT

Title (en)

PROCESS FOR DECARBONISING A HIGH-CHROMIUM STEEL MELT

Title (de)

VERFAHREN ZUM ENTKOHLEN EINER HOCHCHROMHALTIGEN STAHLSCHMELZE

Title (fr)

PROCEDE DE DECARBURATION D'UN ACIER EN FUSION A HAUTE TENEUR EN CHROME

Publication

EP 0857222 B1 (DE)

Application

EP 96938964 A

Priority

  • DE 9601970 W
  • DE 19540490 A

Abstract (en)

[origin: DE19540490C1] The invention relates to a process for decarbonising a steel melt for the production of high-chromium steels with blown oxygen, in which the decarbonisation rate is continuously measured and adjusted in accordance with the measured values of the oxygen to be blown in, in which the following control values are calculated: a) the duration of the Al-Si oxidation phase at the start of the decarbonisation process; b) the duration of the main decarbonisation phase immediately following the Al-Si oxidation phase as far as the transition point from the decarbonisation reaction to metal oxidation; and c) the decarbonisation rate in the main decarbonisation phase; and in which the quantity of oxygen blown in is increased at an accelerated rate to the quantity of oxygen in the main decarbonisation phase until the decarbonisation rate as per c) is reached, the decarbonisation rate is kept substantially constant during the main decarbonisation phase by the quantity of oxygen blown in and immediately after the main decarbonisation phase the quantity of oxygen blown in is continuously reduced in such a way that the decarbonisation rate is reduced gradually in time at a predetermined time constant.

IPC 1-7 (main, further and additional classification)

C21C 7/068; C21C 5/30

IPC 8 full level (invention and additional information)

C21C 5/30 (2006.01); C21C 7/068 (2006.01)

CPC (invention and additional information)

C21C 7/0685 (2013.01); C21C 5/30 (2013.01)

Designated contracting state (EPC)

AT BE DE DK ES FI FR GB IT LU NL SE

EPO simple patent family

DE 19540490 C1 19970410; AT 188511 T 20000115; AU 701824 B2 19990204; AU 7619796 A 19970515; BR 9611224 A 19990406; CN 1063493 C 20010321; CN 1200768 A 19981202; CZ 9801252 A3 19980812; EP 0857222 A1 19980812; EP 0857222 B1 20000105; ES 2140912 T3 20000301; JP 3190351 B2 20010723; JP H11504079 A 19990406; KR 100275100 B1 20001215; MX 9802987 A 19980930; PL 186610 B1 20040130; PL 326503 A1 19980928; RU 2139355 C1 19991010; SK 283186 B6 20030304; SK 50198 A3 19990111; US 6093235 A 20000725; WO 9715692 A1 19970501

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