PURPOSE: To produce a material for the welded can excellent in high-speed seam weldability, resistances to corrosion and heat and coating adhesion by successively forming an Ni-Fe alloy plating layer, an Sn plating layer and a chromate coating film on the surface of a steel sheet under specified conditions.
CONSTITUTION: An Ni-Fe alloy plating layer (contg. about 10-80wt.% Fe) or an Ni-P alloy plating layer (contg. about 0.1-10wt.% P) is formed on the surface of a steel sheet at 150-2500mg/m2 per side. An Sn plating layer, in which the Sn plating grains having 0.2-12.0μm diameter are interspersed at 400-2800mg/m2, is formed on the plating layer, and further, a chromate coating film is formed on the Sn plating layer at 1-50mg/m2 expressed in terms of chromium. When the coated material is baked at high temp. for a short time and then high-speed seam welded, a material for the welded can having a sufficiently wide appropriate welding range and excellent in coating adhesion and corrosion resistance after coating is obtained.
HIRANO SHIGERU
ICHIKAWA TAKASHI
KATAYAMA TOSHINORI
