The present invention relates to a method for manufacturing superheater coil tubes and connecting tube thereof as well as assembling to the tube wall of the steam generator, wherein the coil tube is respectively formed by a straight tube and a bended component at least. The connecting tube is respectively provided with a sleeve equipped to the outside of the connecting tube at least. The method comprises the following steps: providing straight, bend precursor and connecting tubes of deposition-hardened nickel-based alloy in solution-annealed form, and sheaths of material not to be heat-treated, in a workshop; forming the bends and connecting tubes in a workshop, using bending tools; forming the individual coils by joining the straight tubes and bends, and joining the sheaths with the connecting tubes in the region where the pipes pass through the tube wall, using weld seams formed in a workshop; deposition-hardening the coils and sheathed connecting tubes in a first heater in a workshop; producing the coils through connecting the straight tubes with the bends by weld seams and connecting the sleeve with the connecting tubes through the weld seams; deposition hardening these seams between the straight tubes and bended components and between the sleeve and the connecting tubes by a second heater in the workshop; connecting the coils and the connecting tubes through weld seams and connecting the sleeve and an accommodating component through the weld seams; and deposition hardening these weld seams with the second heater at the mounting site.