Patent ID: 8337998
Filing Date: 2012-12-25
Classification: B23K,C21D,C22C,Y10T

Abstract:
1. A joined body of dissimilar metals, produced by joining a steel material and an aluminum alloy material, wherein the steel material comprises Fe and: C: 0.01 to 0.30 mass %; Si: 0.1 to 3.00 mass %; Mn: 0.1 to 3.00 mass %; P: 0 to 0.10 mass %; S: 0 to 0.05 mass %; and N: 0 to 300 ppm, and a ratio occupied by an outer oxide comprising Mn and Si at a total amount of 1 at % or more, which is present on the steel material surface, is 80 to 100% as an average ratio of a total length of the oxide occupied for a length of 1 μm in a substantially horizontal direction of an interface between a steel body and an outer oxide layer, wherein the aluminum alloy material is a 7000 series aluminum alloy comprising Al and 1.0 mass % or more of Mg, and wherein the joined body comprises a reaction layer comprising Fe and Al at a joint interface between the steel material and the aluminum alloy material, and a content of Fe at a joint interface on an aluminum alloy material side is 2.0% by mass or less.