Global Patent Index - EP 1332232 B1

EP 1332232 B1 20040407 - METHOD FOR PRODUCING STAINLESS STEELS, IN PARTICULAR HIGH-GRADE STEELS CONTAINING CHROMIUM AND CHROMIUM-NICKEL

Title (en)

METHOD FOR PRODUCING STAINLESS STEELS, IN PARTICULAR HIGH-GRADE STEELS CONTAINING CHROMIUM AND CHROMIUM-NICKEL

Title (de)

VERFAHREN ZUR ERZEUGUNG NICHTROSTENDER STÄHLE, INSBESONDERE CHROM- UND CHROMNICKELHALTIGER EDELSTÄHLE

Title (fr)

PROCEDE POUR PRODUIRE DES ACIERS INOXYDABLES, NOTAMMENT DES ACIERS SPECIAUX AU CHROME ET AU CHROME-NICKEL

Publication

EP 1332232 B1 20040407 (DE)

Application

EP 01969784 A 20010927

Priority

  • DE 10051803 A 20001018
  • DE 10115779 A 20010329
  • DE 10134880 A 20010718
  • DE 10137761 A 20010801
  • EP 0111190 W 20010927

Abstract (en)

[origin: WO0233130A1] The invention relates to a method for producing stainless steels, in particular steels containing chromium and chromium-nickel. The method is carried out in a melting device containing a metallurgical vessel, or in a melting device (1) containing at least two vessels (2, 3) for supplying a steel-casting installation, an electric arc furnace process (1) and an air-refining process taking place alternately in the two vessels (2, 3). To improve the efficiency of a method of this type, the aim of the invention is to carry out a reversible treatment of unreduced converter slag in the electric arc furnace mode. To achieve this, in the first treatment stage, the slag (19) with a high chromium content is melted together with the added charge, the slag is then reduced during the melting process with the silicon and carbon under favourable thermodynamic conditions of the arc, once the slag has reached a minimum temperature of 1,490 DEG C and the slag is subsequently removed. The air-refining process is then carried out, during which the carbon content is reduced to a value of less than 0.9 %. The metal slag (18) is tapped at a tapping temperature of between 1,620 and 1,720 DEG C, the unreduced slag (19) with a high chromium content from the air-refining process remaining in the treatment vessel.

IPC 1-7

C21C 7/068; C21C 5/52

IPC 8 full level

C21C 7/00 (2006.01); C21C 5/00 (2006.01); C21C 5/52 (2006.01); C21C 7/068 (2006.01); F27B 3/04 (2006.01); F27B 3/22 (2006.01)

CPC (source: EP KR)

C21C 5/005 (2013.01 - EP); C21C 5/5252 (2013.01 - EP); C21C 5/5264 (2013.01 - EP); C21C 7/068 (2013.01 - KR); C21C 7/0685 (2013.01 - EP)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family (publication)

WO 0233130 A1 20020425; AT 263845 T 20040415; BR 0114773 A 20031007; BR 0114773 B1 20100309; CN 1222629 C 20051012; CN 1469933 A 20040121; CZ 20031111 A3 20031015; CZ 299403 B6 20080716; DE 50101945 D1 20040513; EP 1332232 A1 20030806; EP 1332232 B1 20040407; ES 2218450 T3 20041116; JP 2004511659 A 20040415; KR 100819126 B1 20080402; KR 20030040541 A 20030522; MX PA03003402 A 20040504; PL 196203 B1 20071231; PL 360842 A1 20040920; TW 554046 B 20030921; US 2004099091 A1 20040527; US 7094271 B2 20060822

DOCDB simple family (application)

EP 0111190 W 20010927; AT 01969784 T 20010927; BR 0114773 A 20010927; CN 01817484 A 20010927; CZ 20031111 A 20010927; DE 50101945 T 20010927; EP 01969784 A 20010927; ES 01969784 T 20010927; JP 2002536098 A 20010927; KR 20037005323 A 20030416; MX PA03003402 A 20010927; PL 36084201 A 20010927; TW 90125517 A 20011016; US 39900703 A 20030721