Junction manner and the junction coupling null alloy melting galvanized steel sheet, the melting galvanized steel sheet and the electric galvanized steel sheet which use the steel sheet and that

摘要

PROBLEM TO BE SOLVED: To provide a steel sheet which can provide a bonded joint having not only superior shearing tensile strength but also superior peeling strength when being brazing-jointed with an aluminum-based material.;SOLUTION: This steel sheet is any one sheet selected from the group consisting of a galvannealed sheet steel, a hot-dip galvanized steel sheet, an electrogalvanized steel sheet, a cold-rolled steel sheet and a hot-rolled steel sheet; comprises, by mass% (hereafter the same), 0.05-0.25% C, 1.5% or less Si, 0.1-3.5% Mn, 0.05% or less P, 0.03% or less S, 0.1% or less Al, while satisfying the relation of C+(Si+Mn)/40≥0.15, and the balance Fe with unavoidable impurities; and forms an intermetallic compound layer with a thickness of 2 μm or smaller in a central part of a jointed interface after having been brazing-jointed with the aluminum-based material.;COPYRIGHT: (C)2007,JPO&INPIT