| abstract |
PROBLEM TO BE SOLVED: To provide a hydroform for mounting a metal pipe such as a steel pipe or an aluminum pipe in a mold, applying an internal pressure to the inside of the pipe and pushing the pipe in a pipe axial direction into a predetermined shape. A fusible lubricated surface-treated metal plate for sheet hydroforms, in which a metal tube such as a metal tube, steel plate, or aluminum plate is mounted in a mold and processed to a predetermined shape by applying internal pressure. The molding method used is provided. SOLUTION: A soluble lubricated surface-treated metal product for hydroform having excellent moldability and emulsion-type hydraulic oil resistance, characterized by having a soluble lubricating resin film on the surface. The soluble lubricating resin film contains an acid group in the molecule, and the neutralizing agent for the acid group is a mixture of sodium hydroxide and amine or a mixture of potassium hydroxide and amine, or a mixture of sodium hydroxide, potassium hydroxide and amine. It is desirable that the aqueous solution of a soluble polyurethane (A) composed of a mixture of the above (A) and 1 to 50% by mass of the lubricating function-imparting agent (B) with respect to the polyurethane composition be a main component. |