Material for three-layer stainless steel clad steel plate, thick plate and method for producing steel plate for polymer electrolyte fuel cell separator, and polymer electrolyte fuel cell separator

摘要

A method for producing a clad steel plate material in which B: 0 to 0.3% stainless steel is used as an inner layer material and B: 0.3 to 2.5% stainless steel is combined on both sides as an outer layer material by the following steps. . Step 1: A protect material longer than the side surface length is disposed on the side surface of the outer layer material, a tab material is disposed at the end of the protect material, and the tab material and the protect material, and the outer layer material and the protect material are joined. Step 2: The outer layer material and the inner layer material from which the joint portion between the tab material and the protect material is removed are overlapped to form a combined material. Process 3: The boundary part of the surrounding 4 side surface of a combination material is joined. Moreover, after heating the raw material manufactured by the above-mentioned method, rough rolling, hot rolling is performed, and cold rolling is performed to obtain a three-layer stainless clad steel plate for a fuel cell separator or a solid polymer fuel cell separator.