Patent ID: 9616411
Date: 2017-04-11
CPC Classifications: B01D,B01J,B21B,B23K,C21D,C22C,C23C,C25D,Y10T

Claim:
1. A honeycomb structure comprised of a flat foil and corrugated foil of a metal foil superposed and wound up, said honeycomb structure characterized in that at least part of said metal foil is a high Al-content steel foil having an Al content of 6.5 mass % to 10 mass % and a steel foil thickness of 0.005 mm to 0.1 mm, and said high Al-content steel foil characterized by having a {222} plane integration of 79% to 95% or a {200} plane integration of 0.01% to 1.8% of the α-Fe crystal with respect to the surface of the steel foil and an elongation at break of 11 to 23%, wherein said steel foil is produced by a process comprising the steps of preheating a matrix steel sheet containing Al in an amount, by mass %, of 3.5% to less than 6.5% at a temperature of 750° C. to 1100° C., depositing an Al or an Al alloy on at least one surface of the matrix steel sheet to obtain a laminate, imparting working strain to the laminate by cold rolling, treating the laminate by diffusion heat treatment, and further cold rolling the laminate.