Patent ID: 6268067
Filing Date: 2001-07-31
Classification: C23C,Y10T

Abstract:
A tube, pipe or fitting having an internally coated surface alloy comprising a base stainless steel alloy containing iron, nickel, chromium and alloying additives, and an enrichment pool layer adjacent said base alloy consisting of 4 to 30 wt % silicon, 0 to 10 wt % titanium, 2 to 45 wt % chromium and optionally 4 to 15 wt % aluminum and the balance iron, nickel and any base alloying additives diffused from the base stainless steel alloy and a protective scale of chromia or alumina on the coating; whereby the enrichment pool is formed which is functional to form a replenishable protective scale of the chromia or alumina on said outermost surface of said component.