Title:
OBJECT COMPRISING A STEEL PART OF A METAL CONSTRUCTION CONSISTING OF AN AREA WELDED BY A HIGH POWER DENSITY BEAM AND EXHIBITING AN EXCELLENT TOUGHNESS IN A MOLTEN AREA, METHOD FOR PRODUCING SAID OBJECT
Document Type and Number:
WIPO Patent Application WO2006013242
Kind Code:
A9
Abstract:
The invention relates to an object comprising at least one steel part whose composition consists of the following contents expressed by weight: 0.005-0.27 % carbon, 0.5-1.6 % manganese, 0.1-0.4 % silicon, less than 2.5 % chromium content, less than 1 % molybdenum content, optionally one or several elements selected form nickel, copper, aluminium, niobium, vanadium, titanium, boron, zirconium and nitrogen, the rest being iron and impurities of production, wherein said steel part comprises at least one area welded by a high power density beam and is characterised in that the microstructure of the welded area is constituted of 60-75 % self-tempered martensite, preferentially 60-70 % self-tempered martensite, and, in addition, of 40-30 % lower bainite.
Inventors:
KAPLAN DOMINIQUE (FR)
Application Number:
PCT/FR2005/001543
Publication Date:
June 14, 2007
Filing Date:
June 21, 2005
Export Citation:
Assignee:
ARCELOR FRANCE (FR)
KAPLAN DOMINIQUE (FR)
KAPLAN DOMINIQUE (FR)
International Classes:
C22C38/02; B23K15/00; B23K26/32; C21D9/50; C22C38/04; C22C38/22
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