Global Patent Index - EP 2192206 A1

EP 2192206 A1 20100602 - Method of producing nanocarbide precipitation strengthened ultrahigh-strength, corrosion resistant, structural steels

Title (en)

Method of producing nanocarbide precipitation strengthened ultrahigh-strength, corrosion resistant, structural steels

Title (de)

Verfahren zur Herestellung Nanocarbidausscheidung verfestigte ultrahochfeste, korrosionsbeständige Baustähle

Title (fr)

Fabrication d'aciers structurels, résistant à la corrosion et à résistance ultra forte renforcée par des nanocarbure précipites

Publication

EP 2192206 A1 20100602 (EN)

Application

EP 10151840 A 20030207

Priority

  • EP 03736433 A 20030207
  • US 7168802 A 20020208
  • US 0204111 W 20020211

Abstract (en)

A nanocarbide precipitation strengthened ultrahigh-strength, corrosion resistant, structural steel possesses a combination of strength and corrosion resistance comprising in combination, by weight, about: 0.1 to 0.3% carbon (C), 8 to 17% cobalt (Co), 0 to 10% nickel (Ni), 6 to 12% chromium (Cr), less than 1% silicon (Si), less than 0.5% manganese (Mn), and less than 0.15% copper (Cu), with additives selected from the group comprising about: less than 3% molybdenum (Mo), less than 0.3% niobium (Nb), less than 0.8% vanadium (V), less than 0.2% tantalum (Ta), less than 3% tungsten (W), and combinations thereof, with additional additives selected from the group comprising about: less than 0.2% titanium (Ti), less than 0.2% lanthanum (La) or other rare earth elements, less than 0.15% zirconium (Zr), less than 0.005% boron (B), and combinations thereof, impurities of less than about: 0.02% sulfur (S), 0.012% phosphorus (P), 0.015% oxygen (O) and 0.015% nitrogen (N), the remainder substantially iron (Fe), incidental elements and other impurities. The alloy is strengthened by nanometer scale MZC carbides within a fine lath martensite matrix from which enhanced chemical partitioning of Cr to the surface provides a stable oxide passivating film for corrosion resistance. The alloy, with a UTS in excess of 280 ksi, is useful for applications such as aircraft landing gear, machinery and tools used in hostile environments, and other applications wherein ultrahigh-strength, corrosion resistant, structural steel alloys are desired.

IPC 8 full level

C21D 6/00 (2006.01); C22C 38/22 (2006.01); C21D 6/02 (2006.01); C21D 6/04 (2006.01); C21D 8/00 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C22C 38/30 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01)

CPC (source: EP)

C21D 6/02 (2013.01); C21D 6/04 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01)

Citation (search report)

  • [A] US 6176946 B1 20010123 - KUEHMANN CHARLES J [US], et al
  • [A] US 5221372 A 19930622 - OLSON GREGORY B [US]
  • [A] US 5358577 A 19941025 - UEHARA TOSHIHIRO [JP], et al
  • [A] US 5310431 A 19940510 - BUCK ROBERT F [US], et al
  • [A] EP 0739994 A1 19961030 - HITACHI METALS LTD [JP]
  • [A] CAMPBELL C.E., OLSON G.B.: "Systems design of high performance stainless steels. I. Conceptual and computational design", JOURNAL OF COMPUTER-AIDED MATERIALS DESIGN, vol. 7, no. 3, 2000, KLUWER ACADEMIC/ESCOM NETHERLANDS, pages 145 - 170, XP009037218, ISSN: 0928-1045
  • [A] CAMPBELL C.E., OLSON G.B.: "Systems design of high performance stainless steels. II. Prototype characterization", JOURNAL OF COMPUTER-AIDED MATERIALS DESIGN, vol. 7, no. 3, 2000, KLUWER ACADEMIC/ESCOM NETHERLANDS, pages 171 - 194, XP009037219, ISSN: 0928-1045

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR

DOCDB simple family (publication)

WO 03076676 A2 20030918; WO 03076676 A8 20041028; AT E464403 T1 20100415; AU 2003237775 A1 20030922; AU 2003237775 A8 20030922; CA 2475248 A1 20030918; CA 2475248 C 20110405; DE 60332100 D1 20100527; EP 1481108 A1 20041201; EP 1481108 B1 20100414; EP 2192206 A1 20100602; EP 2192206 B1 20130612; ES 2342277 T3 20100705

DOCDB simple family (application)

US 0303682 W 20030207; AT 03736433 T 20030207; AU 2003237775 A 20030207; CA 2475248 A 20030207; DE 60332100 T 20030207; EP 03736433 A 20030207; EP 10151840 A 20030207; ES 03736433 T 20030207