Patent ID: 8557397

Claim:
A steel sheet comprising: a first stainless steel region having a thickness of about 5 μm to about 250 μm; a first bonding region positioned between the first stainless steel region and a core region, the first bonding region having a thickness that is greater than 1 μm and less than the thickness of the first stainless steel region; the core region having a thickness of about 100 μm to about 4 mm, the core region having a core composition that comprises at least 85 wt. % iron; a second bonding region positioned between the core region and a second stainless steel region; the second stainless steel region having a thickness of about 5 μm to about 250 μm; the second bonding region having a thickness that is greater than 1 μm and less than the thickness of the second stainless steel region; the first and second stainless steel regions having stainless steel compositions that, individually, comprise an admixture of iron and chromium, and a chromium concentration of about 10 wt. % to about 30 wt. % that varies by less than 5 wt. %; and the first and second bonding regions having bonding compositions, the bonding composition, individually, comprising an admixture of iron and chromium, having a chromium concentration proximal to the respective stainless steel region that is approximately equal to the chromium concentration of the stainless steel region and having a chromium concentration proximal to the core region that has less than about 2 wt. % chromium.