Patent ID: 6749894
Filing Date: 2004-06-15
Classification: C23C,Y10T

Abstract:
A method of providing a protective coating on an inner surface of a steel substrate of a carbon or low-alloy steel pipe or tube comprising preparing the inner surface of the steel substrate by a process that consists of at least one of boring, honing, bright finishing, grit blasting, grinding, chemical pickling or electro-polishing the steel substrate and depositing a continuous thin coating directly on the inner surface of the steel substrate of a MCrX alloy where M=one of nickel, cobalt, iron or combination thereof and X=one of molybdenum, silicon, tungsten or combination thereof, in the amount of about 45 to 91 wt % M, about 9 to 40 wt % Cr and 2 to about 20 wt % Mo, 0.8 to about 20 wt % Si and 1 to about 10 wt % W, and then heat treating the coating to metallurgically bond the coating onto the steel substrate.