Stainless steel sheet and method for producing the same, separator for polymer electrolyte fuel cell, polymer electrolyte fuel cell, and polymer electrolyte fuel cell

摘要

A stainless steel plate having excellent corrosion resistance, low contact resistance, and excellent press workability without using expensive raw materials such as gold and rare metals, and a method for producing the same are provided. The method for producing a stainless steel sheet includes a step of preparing a slab having a chemical composition of mass%, including Cr: 20 to 26%, N: 0.1% or less, Si: 2.0% or less, etc. (Step S1) The step of obtaining a rolled steel sheet having a thickness of 50 to 200 μm by hot-rolling and cold-rolling the slab (step S2), and the annealing process of annealing and cooling the rolled steel sheet in a gas atmosphere containing nitrogen. (Step S3) and a step (Step S4) of pickling the rolled steel sheet after the annealing step with a solution containing a non-oxidizing acid. The stainless steel plate has an N content of 0.6 to 2.0 mass%.