A method of making a crack-free bimetallic tube for fired heater tubes and/or transfer line exchangers for the transport of hydrocarbon feedstocks in petrochemical process and/or refinery process units, comprising the steps of: i) providing an outer tube layer, wherein said outer tube layer is formed from a steam cracker alloy comprising at least 18.0 wt% Cr and at least 10.0 wt% Ni chosen from HP45Nb, and HP16Nb; ii) plasma powder welding an inner tube layer on the inner surface of the outer tube layer, wherein the inner tube layer is formed from an alumina forming bulk alloy comprising 6.0 to 6.5 wt% of Al, 20.0 to 22.0 wt% Cr, less than 0.45 wt% Si, and from 37.0 to 40.0 wt% Fe and optionally • less than 0.01 wt% carbon, and/or • 0.1 wt% to 2.0 wt% of at least one element chosen from Ga, Ge, As, In, Sn, Sb, Pb, Pd, Pt, Re, Ru, Rh, Ir, Cu, Ag, Au, and combination thereof, and/or • 0.01 to 2.0 wt% of at least one element chosen from Sc, La, Y, Ce, and combination thereof, and/or • 0.01 to 2.0 wt% of oxide particles of at least one element chosen from Al, Si, Sc, La, Y, Ce, and combinations thereof, and/or • 0.01 wt% to 4.0 wt% of at least one element chosen from Mn, Ti, Zr, Hf, V, Nb, Ta, Mo, W, and combinations thereof, and/or • 0.1 wt% to 30.0 wt% of at least one intermetallic precipitate chosen from Ni 3 Al, NiAl, sigma-phase, and combinations thereof, and/or • 0.01 wt% to 5.0 wt% of at least one inclusion chosen from an oxide, a carbide, a nitride, a carbonitride, and combinations thereof, with the balance being Ni; and iii) forming an oxide layer on the surface of the inner tube layer, wherein the oxide layer comprises alumina, chromia, silica, mullite, spinels, or combinations thereof, wherein the forming of the oxide layer on the surface of the inner tube layer occurs in-situ during use of the alumina forming bulk alloy when exposed to hydrocarbon process streams in petrochemical or refining process units or prior to use by exposing the bimetallic tube material to a controlled low oxygen partial pressure environment. i) providing an outer tube layer, wherein said outer tube layer is formed from a steam cracker alloy comprising at least 18.0 wt% Cr and at least 10.0 wt% Ni chosen from HP45Nb, and HP16Nb; ii) plasma powder welding an inner tube layer on the inner surface of the outer tube layer, wherein the inner tube layer is formed from an alumina forming bulk alloy comprising 6.0 to 6.5 wt% of Al, 20.0 to 22.0 wt% Cr, less than 0.45 wt% Si, and from 37.0 to 40.0 wt% Fe and optionally • less than 0.01 wt% carbon, and/or • 0.1 wt% to 2.0 wt% of at least one element chosen from Ga, Ge, As, In, Sn, Sb, Pb, Pd, Pt, Re, Ru, Rh, Ir, Cu, Ag, Au, and combination thereof, and/or • 0.01 to 2.0 wt% of at least one element chosen from Sc, La, Y, Ce, and combination thereof, and/or • 0.01 to 2.0 wt% of oxide particles of at least one element chosen from Al, Si, Sc, La, Y, Ce, and combinations thereof, and/or • 0.01 wt% to 4.0 wt% of at least one element chosen from Mn, Ti, Zr, Hf, V, Nb, Ta, Mo, W, and combinations thereof, and/or • 0.1 wt% to 30.0 wt% of at least one intermetallic precipitate chosen from Ni 3 Al, NiAl, sigma-phase, and combinations thereof, and/or • 0.01 wt% to 5.0 wt% of at least one inclusion chosen from an oxide, a carbide, a nitride, a carbonitride, and combinations thereof, with the balance being Ni; and • less than 0.01 wt% carbon, and/or • 0.1 wt% to 2.0 wt% of at least one element chosen from Ga, Ge, As, In, Sn, Sb, Pb, Pd, Pt, Re, Ru, Rh, Ir, Cu, Ag, Au, and combination thereof, and/or • 0.01 to 2.0 wt% of at least one element chosen from Sc, La, Y, Ce, and combination thereof, and/or • 0.01 to 2.0 wt% of oxide particles of at least one element chosen from Al, Si, Sc, La, Y, Ce, and combinations thereof, and/or • 0.01 wt% to 4.0 wt% of at least one element chosen from Mn, Ti, Zr, Hf, V, Nb, Ta, Mo, W, and combinations thereof, and/or • 0.1 wt% to 30.0 wt% of at least one intermetallic precipitate chosen from Ni 3 Al, NiAl, sigma-phase, and combinations thereof, and/or • 0.01 wt% to 5.0 wt% of at least one inclusion chosen from an oxide, a carbide, a nitride, a carbonitride, and combinations thereof, iii) forming an oxide layer on the surface of the inner tube layer, wherein the oxide layer comprises alumina, chromia, silica, mullite, spinels, or combinations thereof, wherein the forming of the oxide layer on the surface of the inner tube layer occurs in-situ during use of the alumina forming bulk alloy when exposed to hydrocarbon process streams in petrochemical or refining process units or prior to use by exposing the bimetallic tube material to a controlled low oxygen partial pressure environment.