Austenitic stainless steel for polymer fuel cell separator with improved contact resistance and manufacturing method thereof
AssigneePosco
InventorsYoungjun Kim, Dong-hoon Kim, Bo-sung Seo
Life of this patent
Estimating the term…
Abstract
Disclosed is an austenitic stainless steel for a fuel cell separator with improved contact resistance. The austenitic stainless steel for a fuel cell separator with improved contact resistance according to an embodiment of the present disclosure includes, in percent by weight (wt %), at most of C (excluding 0), at most 3.0% of Si (excluding 0), at most 3.0% of Mn (excluding 0), 20 to 30% of Cr, 8 to 20% of Ni, at most 0.003% of S, at most 0.03% of P, at most 0.6% of Mo (excluding 0), at most 0.8% of Cu (excluding 0), 0.1 to 0.3% of N, at most 2.0% of W (excluding and the remainder being Fe and other inevitable impurities.
Claims9
An austenitic stainless steel for a fuel cell separator with improved contact resistance comprising, in percent by weight (wt %), at most 0.1% of C (excluding 0), at most 3.0% of Si (excluding 0), at most 3.0% of Mn (excluding 0), 20 to 30% of Cr, 8 to 20% of Ni, at most 0.003% of S, at most 0.03% of P, at most 0.6% of Mo (excluding 0), at most 0.8% of Cu (excluding 0), 0.1 to 0.3% of N, at most 2.0% of W (excluding 0), and the remainder being Fe and other inevitable impurities.
A method of manufacturing an austenitic stainless steel for a fuel cell separator with improved corrosion resistance, the method comprising:
- bright annealing a cold-rolled austenitic stainless steel comprising, in percent by weight (wt %), at most 0.1% of C (excluding 0), at most 3.0% of Si (excluding 0), at most 3.0% of Mn (excluding 0), 20 to 30% of Cr, 8 to 20% of Ni, at most 0.003% of S, at most 0.03% of P, at most 0.6% of Mo (excluding 0), at most 0.8% of Cu (excluding 0), 0.1 to 0.3% of N, at most 2.0% of W (excluding 0), and the remainder being Fe and other inevitable impurities;
- and
- performing alternating current electrolysis on the bright-annealed material in a sulfuric acid solution,
- wherein the alternating current electrolysis is performed by applying a current density of 15 to 30 A/dm2 for 7 seconds to 10 seconds.
Dependencies are inferred from the claim text.