Steel plate for the outside of automobile bodies electroplated with a zinc alloy and a manufacturing method therefor
AssigneeSumitomo Metal Industries, Ltd.
InventorsTatsuo Kurimoto, Yoshihiko Hoboh, Tadashi Nonaka
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Abstract
Steel plate for automobile bodies and a method for manufacturing the steel plate are disclosed, the steel plate containing 0.02.about.0.03% of P as an alloying element with a total amount of Cu, Ni, Cr, and Mo being more than 0.01% but less than 0.08 weight % and being electroplated with a Zn alloy.
Claims2
Steel plate having improved resistance to creeping upon impact at a low temperature and useful for automobile bodies and being electroplated with an alloy, characterized in that said steel plate contains 0.02.about.0.03 weight % of P as an alloying element and in that said alloy has Zn as a primary component, a total amount of Cu, Ni, Cr and Mo in the steel plate being about 0.05 to about 0.07 weight %.
A method for improving the resistance to creeping upon impact at a low temperature of electroplated steel plate for automobile bodies, comprising the steps of:
- pickling a steel plate containing 0.02.about.0.03 weight % of P as an alloying element and a total amount of Cu, Ni, Cr and Mo of about 0.05 to about 0.07 weight % such that said steel plate undergoes a weight loss of at least 0.8 grams/m.sup.2 during said pickling;
- and
- electroplating the pickled steel plate with a zinc alloy.
Dependencies are inferred from the claim text.