Foil made of a ferrite type heat resistant high alloy steel

摘要

A metal foil made of a ferrite type heat resistant high alloy steel composing a metal honeycomb body for an exhaust gas purification catalyst produced by alternately laminating or integrally winding a flat foil and a corrugated foil, whereby a surface coarseness of said metal foil is in the range of 0.001 to 0.3 mu m in terms of the mean coarseness Rac in the width-wise direction of the foil and a surface shape and condition of said metal foil is at least 100 in terms of the number of peaks PPI per inch length in the width-wise direction of the foil.