Abstract: The object of the present invention is to provide a surface-treated steel sheet, the surface of which is provided with a coating film formed by using after-treatment solution containing carbon black or graphite, carboxy methylcelluolse, and an aqueous organic resin composed of acrylic resin, polyester resin, urethane resin or phenolic resin, thus having a low contact resistance, excellent corrosion-resistance and excellent adhesion of the coating film and to provide a connection terminal member using the above mentioned surface-treated steel sheet. In order to achieve the object, the surface-treated steel sheet of the present invention has a surface provided with a coating film containing carbon black or graphite, carboxy methylcellulose, an aqueous organic resin such as acrylic resin, polyester resin, urethane resin or phenolic resin, and a cross linking agent of the aqueous organic resin, the coating film being formed on a steel sheet which is plated with Zn, Ni, Sn, Co or any alloy of them.

Abstract: A method for producing a metal substrate for a lithographic plate is provided herein by treating the substrate having the thickness in the range of 50 to 400 .mu.m. The said substrate is electrochemically, chemically or mechanically treated in order to provide an average surface roughness in the range of 0.1 to 3 .mu.m, followed by a surface treatment such as plating or chemical treatment, and then followed by a conventional hydrophilic treatment.

Abstract: A method for producing a metal substrate for a lithographic plate is provided herein by treating the substrate having the thickness in the range of 50 to 400 .mu.m. The said substrate is electrochemically, chemically or mechanically treated in order to provide an average surface roughness in the range of 0.1 to 3 .mu.m, followed by a surface treatment such as plating or chemical treatment, and then followed by a conventional hydrophilic treatment.