Black-coated steel sheet, worked material, and panel for flat-panel television
AssigneeJfe Steel Corporation
InventorsChiyoko Tada, Hiroyuki Ogata
Life of this patent
Estimating the term…
Abstract
A black-coated steel sheet exhibits good bendability and a good appearance after press working is provided. Zinc based plating layers, a chromium-free chemical conversion coating disposed on the zinc based plating layer, and a colored single organic coating which is disposed on the chemical conversion coating and which contains a polyester resin having a hydroxyl value of 10 KOHmg/g or more, an imino-containing melamine resin, and 5 to 15 percent by mass of carbon black are included, wherein the glass transition temperature (Tg) of the organic coating is 40° C. or higher, the film thickness is 10 μm or less, and the hardness is 200 N/mm2 or more.
Claims9
A black-coated steel sheet comprising:
- zinc based plating layers disposed on both surfaces of a steel sheet;
- a chromium-free chemical conversion coating disposed on the zinc based plating layer on at least one surface of the steel sheet;
- and
- a colored single organic coating which is disposed on at least one of the chemical conversion coating and which comprises a polyester resin having a hydroxyl value of 10 KOHmg/g or more, an imino-containing melamine resin, and 5 to 15 percent by mass of carbon black,
- wherein the glass transition temperature (Tg) of the colored single organic coating is 40° C. or higher, the film thickness is 10 μm or less, and the hardness is 200 N/mm2 or more.
Dependencies are inferred from the claim text.