Nippon Steel Corporation

Yoshio Shindow

Joji Oka

Yujiro Miyauchi

Narumi Ando

Kiyotoshi Iwasaki

Masaya Tsutsumi

Hideaki Iwakura

Wataru Hotta

A weldable paint-coated steel sheet having improved corrosion resistance, weldability and workability, comprising a zinc alloy coated steel substrate and a paint coating applied thereon, said paint coating containing zinc alloy powder and at least one of the groups consisting of zinc powder and hard electric conductive powder.

Weldable paint-coated steel sheets having excellent corrosion resistance

A steel strip having an excellent phosphate-coating property is produced by subjecting at least one surface of the steel strip to electrolytic treatment in which the steel strip serves as an anode and the steel strip surface is brought into contact with an aqueous solution containing at least one phosphate selected from the group consisting of alkali metal phosphates and ammonium phosphate and having a concentration of phosphoric anions of 0.05 mole/l or more and a pH of from 4 to 7, at an anode current density of 2 A/dm.sup.2 or more, to an extent that a phosphate surface layer is formed in an amount of 0.0001 to 0.05 g/m.sup.2 on the metal strip surface.

Method for producing a steel strip having an excellent phosphate-coating

Growing community of inventors

Chiba, Japan

Yoshio Shindow