| 摘要 |
PROBLEM TO BE SOLVED: To provide a galvanized steel material less likely generating an unplated part even when the composition of a plating layer is within a range regulated by RoHS command for restricting use of a specific harmful substance in European Union, namely, Pb concentration: 0.1 mass% or lower and Cd concentration: 0.01 mass% or less, and having a low black discoloration property.SOLUTION: In a galvanized steel material, the composition of a plating layer is expressed as follows; Pb: 0.10 mass% or lower, Sb: 0.04-0.50 mass%, and the residue is Zn. In a galvanized steel, a steel material to be plated is a steel pipe, a carbon steel tube having an outer diameter of 10-700 mm. |
