PURPOSE: To produce a corrosive gas resistant pipe capable of coping with the problem of corrosion caused by high temp. corrosive gases including sulfur such as hydrogen sulfide, sulfur dioxide or the like and excellent in resistance in an atmosphere at a very high temp. (such as high temp. strength).

CONSTITUTION: For constituting this corrosive gas resistant pipe, on the inside of an external layer part constituted of a heat resistant steel casting, an internal layer part 2 constituted of a corrosive gas resistant alloy contg., by weight, ≥50% Cr, and the balance Fe is integrally formed. Or, the internal layer part is moreover incorporated with ≤6% Co, ≤5% W, 0.5 to 3.5% Si, 0.5 to 1.5% Mn and 0.03 to 0.2% C.