The flat steel item which has rust prevention metal coating and the method of forming rust prevention Zn Mg metal coating in the flat steel item

摘要

Topic Not only possessing the rust prevention ability to be superior, there are times when the flat steel item which possesses also the coating characteristic where the organic layer which is applied at weldability and after are superior is superior, has Zn Mg coating is offered.SolutionsThis invention regards the flat steel item which has Zn Mg Al coating. As for at this coating due to this invention, other than the impurity of zinc and inevitability, Mg: 4 8% (weight %, the following same) and Al: The 0.5 1.8%, and it is optional, but below-mentioned element namely Si of one or more which possesses the content which is less than the upper limit which specifies on description below: 2% (weight %, following similar), Pb: 0.1%, Ti: 0.2%, Ni: 1%, Cu: 1%, Co: 0.3%, Mn: 0.5%, Cr: 0.2%, Sr: 0.5%, Fe: 3%, B: 0.1%, Bi: 0.1%, Cd0.1%, REM0.2% and Sn0.5% are contained. Selective figure It is not