Global Patent Index - EP 0924313 A1

EP 0924313 A1 19990623 - Ferritic Chromium alloyed steel

Title (en)

Ferritic Chromium alloyed steel

Title (de)

Ferritischer Chromstahl

Title (fr)

Acier au chrome ferritique

Publication

EP 0924313 A1 19990623 (EN)

Application

EP 98124277 A 19981218

Priority

  • US 99438297 A 19971219
  • US 15382298 A 19980915

Abstract (en)

A ferritic non-ridging stainless steel and process therefor. A chromium alloyed steel melt containing sufficient titanium and nitrogen but a controlled amount of aluminum is cast into an ingot or continuously cast into a strip or a slab having an as-cast fine equiaxed grain structure substantially free of columnar grains. The as-cast steel contains 0.08% C, at least about 8% Cr, up to 1.50% Mn, < 0.020% Al, ≤ 0.05% N, ≤ 1.5% Si, < 2.0% Ni, Ti ≥ 0.10%, the ratio of (Ti x N)/Al ≥ 0.14, all percentages by weight, the balance Fe and residual elements. Preferably, the titanium is controlled so that (Ti/48)/Ä(C/12) + (N/14)Ü > 1.5. A hot processed sheet may be formed from a continuously cast slab without grinding the surfaces of the slab. The hot processed sheet may be descaled, cold reduced to a final thickness and recrystallization annealed. Annealing the hot processed sheet prior to cold reduction is not required to obtain an annealed sheet essentially free of ridging and having high formability. <IMAGE>

IPC 1-7

C22C 38/18; C22C 38/50; C21D 8/02; C21D 8/04

IPC 8 full level

C21D 9/46 (2006.01); C21D 8/02 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01); C22C 38/40 (2006.01); C22C 38/50 (2006.01)

CPC (source: EP)

C21D 8/0215 (2013.01); C22C 38/18 (2013.01); C22C 38/50 (2013.01)

Citation (search report)

  • [A] GB 2071148 A 19810916 - NIPPON STEEL CORP
  • [A] EP 0765941 A1 19970402 - KAWASAKI STEEL CO [JP]
  • [A] EP 0247264 A2 19871202 - NIPPON STEEL CORP [JP]
  • [A] EP 0638653 A1 19950215 - NIPPON STEEL CORP [JP]
  • [DA] US 4465525 A 19840814 - YOSHIMURA HIROFUMI [JP], et al
  • [DA] US 4964926 A 19901023 - HILL JAMES B [US]
  • [X] A. OSTROWSKI AND E.W. LANGER: "Precipitation of titanium carbonitrides in as-cast 17% chromium stainless steels", SCANDINAVIAN JOURNAL OF METALLURGY, vol. 8, no. 4, 1979, pages 153 - 160, XP002096879
  • [A] CHEMICAL ABSTRACTS, vol. 112, no. 20, 14 May 1990, Columbus, Ohio, US; abstract no. 183567, VILLAFUERTE, J. C. ET AL: "Electromagnetic stirring and grain refinement in stainless steel GTA [gas tungsten arc] welds" XP002096588 & WELD. RES. (MIAMI) (1990), (JAN.), 1-13 PUBLISHED IN: WELD. J. (MIAMI), 69(1) CODEN: WERSA3;ISSN: 0096-7629, 1990
  • [A] CHEMICAL ABSTRACTS, vol. 85, no. 10, 6 September 1976, Columbus, Ohio, US; abstract no. 66554, SAWHILL, J. M., JR. ET AL: "Ductility and toughness of stainless steel welds" XP002096589 & WELD. RES. (MIAMI) (1976), (FEB.), 33-41 PUBLISHED IN: WELD. J. (MIAMI, FLA.), 55(2) CODEN: WERSA3, 1976
  • [A] PATENT ABSTRACTS OF JAPAN vol. 097, no. 002 28 February 1997 (1997-02-28)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 098, no. 001 30 January 1998 (1998-01-30)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 097, no. 003 31 March 1997 (1997-03-31)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 097, no. 003 31 March 1997 (1997-03-31)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 006, no. 158 (C - 120) 19 August 1982 (1982-08-19)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 098, no. 001 30 January 1998 (1998-01-30)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB IT LI NL SE

DOCDB simple family (publication)

EP 0924313 A1 19990623; EP 0924313 B1 20040526; AR 017437 A1 20010905; AT E267886 T1 20040615; BR 9805348 A 19991130; CA 2254564 A1 19990619; CA 2254564 C 20120710; CN 1088122 C 20020724; CN 1224070 A 19990728; DE 69824131 D1 20040701; DE 69824131 T2 20050602; DK 0924313 T3 20040809; ES 2222549 T3 20050201; JP 4388613 B2 20091224; JP H11246944 A 19990914; RU 2227172 C2 20040420; TW 496903 B 20020801

DOCDB simple family (application)

EP 98124277 A 19981218; AR P980106516 A 19981218; AT 98124277 T 19981218; BR 9805348 A 19981216; CA 2254564 A 19981127; CN 98125446 A 19981218; DE 69824131 T 19981218; DK 98124277 T 19981218; ES 98124277 T 19981218; JP 36090698 A 19981218; RU 98123163 A 19981221; TW 87117755 A 19981027