Patent ID: 9416460
Filing Date: 2016-08-16
CPC Classification: B32B,C21D,C23C,C25D,Y10T

Claim Text:
1. A steel sheet for containers comprising: on at least one side of the steel sheet, a chemical conversion coating layer consisting of a zirconium component containing 0.1 mg/m wherein the chemical conversion coating is formed by cathode electrolysis treatment with a chemical conversion treatment solution containing zirconium ions, phosphate ions and phenolic resin, wherein an area ratio of particles derived from the chemical conversion treatment solution satisfying {(a+b)/2}>200 (nm) at a surface of the chemical conversion coating layer is 1% to 20%, where a (nm) is the length of the major axis, which is the line segment having the maximum length among line segments connecting one end and another end of any given particle in the chemical conversion coating layer, and b (nm) is the length of the minor axis, which is the line segment having the maximum length among line segments connecting one end and another end of the particle and crossing the major axis at right angles, wherein the steel sheet comprises on at least one side thereof a nickel plating layer containing 10 mg/m