Nields & Lemack
Weldable black steel sheet
 A black steel sheet having a sufficiently small coating thickness to allow the welding of the steel sheet, and yet exhibiting an excellently black surface. It is a steel sheet having a surface plated with zinc or a zinc alloy, and carrying a chromate film formed on its plated surface, and a black film formed on the chromate film from a composition comprising specific proportions of a thermosetting resin and a black dye, which are both soluble in an organic solvent, and having a sufficiently small thickness. The composition may further contain a solid lubricant, or a granular rust-inhibitive pigment, or both. 
NKK Corporation
Y C C C Y C C Y Y
Y10T C09D C23C C23C Y10T C09D C23C Y10T Y10T
additional inventional inventional inventional additional inventional inventional additional additional
Toshiyuki Tsutomu Toyofumi Tatsuya Naoto Masaaki
Ookuma Watanabe Watanabe Miyoshi Yoshimi Yamashita