12-02-2015 дата публикации
Номер: US20150043962A1
Принадлежит:
A tailored blank for hot stamping includes a welded portion formed by butt-welding a first aluminum-plated steel sheet and a second aluminum-plated steel sheet, an Average Al concentration of a weld metal in the welded portion is in a range of 0.3 mass % to 1.5 mass %, an Acpoint of the weld metal is 1250° C. or lower, and furthermore, an aluminum layer formed during the butt-welding is present on a surface of the welded portion. 1. A tailored blank for hot stamping comprising:a welded portion formed by butt-welding a first aluminum-plated steel sheet and a second aluminum-plated steel sheet,{'sub': '3', 'wherein an average Al concentration of a weld metal in the welded portion is 0.3 mass % to 1.5 mass %, in the following formula (1), an Acpoint of the weld metal defined in unit ° C. is 1250° C. or lower, and'} [{'br': None, '[Expression 1]'}, {'br': None, 'sub': '3', 'sup': '0.5−15.2', 'Ac=910−230×C×Ni+44.7×Si+104×V+31.5×Mo+13.1×W−30×Mn−11×Cr−20×Cu+700×P+400×Al+120×As+400×Ti\u2003\u2003Formula (1)'}], 'furthermore, an aluminum layer formed during the butt-welding is present on a surface of the welded portion,'}where, C, Ni, Si, V, Mo, W, Mn, Cr, Cu, P, Al, As, and Ti in the formula represent amounts of individual elements in the weld metal in mass %, and elements not contained are considered to have an amount of zero in computation.4. The tailored blank for hot stamping according to claim 1 ,wherein, when a thickness of a thinnest portion of the weld metal is represented by t in unit mm, a sheet thickness of the first aluminum-plated steel sheet is represented by t1 in unit mm, and a sheet thickness of the second aluminum-plated steel sheet is represented by t2 in unit mm,in a case in which the t1 is equal to the t2, the t is 80% or more of the t1; andin a case in which the t1 is different from the t2, the t is 80% or more of smaller of the t1 and the t2.5. The tailored blank for hot stamping according to claim 1 ,wherein, in a case in which the t1 that is the ...
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