Method for producing steam generator tube walls consisting primarily of 9-12% martensitic chromium steels

A method for producing steam generator tube walls including 9-12% martensitic chromium steels;

• where the tube walls include corner bends and tube wall panels selected from plane tube wall panels, curved tube wall panels, and transition tube wall panels, the tube wall panels including longitudinally extending tubes, fins and half-fins forming oppositely disposed outer edges, the longitudinally extending tubes, the fins and the half-fins each having a length, the half-fin being disposed at outer edges, the longitudinally extending tubes of the tube wall panel disposed adjacent the outer edges defining one or more outermost tubes and other of the longitudinally extending tubes of the tube wall panel defining one or more middle tubes;
• the tube walls defining a penetration opening at a tube wall region at which one or more additional tubes are passed through the tube wall, one or more tube wall penetration openings being configured with a take-up member defining the one or more tube wall penetration openings, and the tube wall panels exhibit at periphery longitudinal fin-fin panel joints and transverse circumferential weld-panel joints;
• the method comprising the following steps:
• a) producing the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels, or the corner bends in a workshop, the plane tube walls, or the curved tube wall panels, or the transition tube wall panels being produced by connecting the longitudinally extending tubes, the fins and the half-fins with welded seams, and the take-up member with welded seams to the tube wall panels, and the corner bends being produced by connecting the corner bends with the connecting fins with welded seams,
• whereby the transition tube wall panel includes a first section having inclined tubes, a second section having vertical tubes and fittings disposed at a transition intermediate the first and second sections, the first section, the second section and the fittings being connected with a welded seam,
• whereby the corner bends are connected with the connecting fins with a welded seam,
• whereby the middle tubes and the fins are made of a 9-12% martensitic chromium steel, the outermost tubes on both sides of the tube wall panel are made of 9-12% martensitic chromium steel or of a material that is not to be heat treated, the half-fins are made of a material that is not to be heat treated or of a 9-12% martensitic chromium steel, a buffering applied on the half-fins is made of a material that does not require tempering, the take-up member are made of a material that is not to be heat treated, the corner bends with the connecting fins are made of a material that is not to be heat treated, and
• whereby the fittings are made of a 9-12% martensitic chromium steel or of a material that is not to be heat treated;
• b) tempering the welded seams of the produced tube wall panels in the workshop with a first heating device;
• c) connecting of the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels, or the corner bends at their circumferential weld-panel joints by using filler plates with welded seams at an assembly site, whereby the filler plates are made of a 9-12% martensitic chromium steel;
• d) tempering the welded seams at the circumferential weld-panel joints of the tube wall panels or the corner bends at the assembly site with second heating devices located in a region adjacent the welded seams and on both sides of the tube wall panels;
• e) connecting the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels corner bends at the half-fins or the connecting fins at the assembly site with welded seams without a subsequent tempering of these welded seams;
• and
• f) passing the one or more additional tube through the particular take-up member of the tube walls, each of the at least one additional tubes has a sleeve mounted thereon, whereby each sleeve is prepared from a material that is not to be heat treated, is arranged in the penetration region of the tube wall and is connected with the tube, and connecting of the sleeve with the take-up member at the assembly site with a welded seam without a subsequent tempering of these welded seams.

A method for producing steam generator tube walls including 9-12% martensitic chromium steels;

• where the tube walls include tube wall panels selected from plane tube wall panels, curved tube wall panels, and transition tube wall panels, the tube wall panels including longitudinally extending tubes, fins and half-fins forming oppositely disposed outer edges, the longitudinally extending tubes, the fins and the half-fins each having a length, a half-fin being disposed at each outer edge, the longitudinally extending tubes of the tube wall panel disposed adjacent the outer edges defining one or more outermost tubes and other longitudinally extending tubes of the tube wall panel defining one or more middle tubes;
• the tube walls defining a penetration opening at a tube wall region at which one or more additional tubes are passed through the tube wall, one or more tube wall penetration openings being configured with a take-up member defining the one or more tube wall penetration openings, and the tube wall panels exhibit at periphery longitudinal fin-fin panel joints and transverse circumferential weld-panel joints;
• the method comprising the following steps:
• a) producing the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels in a workshop, the plane tube walls, or the curved tube wall panels, or the transition tube wall panels being produced by connecting the longitudinally extending tubes, the fins and the half-fins with welded seams, and the take-up member with welded seams to the tube wall panels,
• whereby the transition tube wall panel includes a first section having inclined tubes, a second section having vertical tubes and fittings disposed at a transition intermediate the first and second sections, the first section, the second section and the fittings being connected with a welded seam,
• whereby the middle tubes and the fins are made of a 9-12% martensitic chromium steel, the outermost tubes on both sides of the tube wall panel are made of 9-12% martensitic chromium steel or of a material that is not to be heat treated, the half-fins are made of a material that is not to be heat treated or of a 9-12% martensitic chromium steel, a buffering applied on the half-fins is made of a material that does not require tempering, the take-up member are made of a material that is not to be heat treated, and
• whereby the fittings are made of a 9-12% martensitic chromium steel or of a material that is not to be heat treated;
• b) tempering the welded seams of the produced tube wall panels in the workshop with a first heating device;
• c) connecting of the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels at their circumferential weld-panel joints by using filler plates with welded seams at an assembly site, whereby the filler plates are made of a 9-12% martensitic chromium steel;
• d) tempering the welded seams at the circumferential weld-panel joints of the tube wall panels at the assembly site with second heating devices located in a region adjacent the welded seams and on both sides of the tube wall panels;
• e) connecting the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels at their half-fins at the assembly site with welded seams without a subsequent tempering of these welded seams;
• and
• f) passing the one or more additional tubes through the particular take-up member of the tube walls, each of the one or more additional tubes has a sleeve mounted thereon, whereby each sleeve is prepared from a material that is not to be heat treated, is arranged in the penetration region of the tube wall and is connected with the tube, and connecting of the sleeve with the take-up member at the assembly site with a welded seam without a subsequent tempering of these welded seams.

A method for producing steam generator tube walls including 9-12% martensitic chromium steels;

• where the tube walls include tube wall panels selected from plane tube wall panels, curved tube wall panels, and transition tube wall panels, the tube walls defining a penetration opening at a tube wall region at which one or more additional tubes are passed through the tube wall, one or more tube wall penetration openings being configured with a take-up member defining the one or more tube wall penetration openings, and the tube wall panels exhibit at periphery longitudinal fin-fin panel joints and transverse circumferential weld-panel joints;
• the method comprising the following steps:
• a) producing the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels in a workshop, the plane tube walls, or the curved tube wall panels, or the transition tube wall panels being produced by connecting the longitudinally extending tubes, the fins and the half-fins with welded seams, and the take-up member with welded seams to the tube wall panels;
• b) tempering the welded seams of the produced tube wall panels in the workshop with a first heating device;
• c) connecting of the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels at their circumferential weld-panel joints by using filler plates with welded seams at an assembly site, whereby the filler plates are made of a 9-12% martensitic chromium steel;
• d) tempering the welded seams at the circumferential weld-panel joints of the tube wall panels at the assembly site with second heating devices located in a region adjacent the welded seams and on both sides of the tube wall panels;
• e) connecting the plane tube wall panels, or the curved tube wall panels, or the transition tube wall panels at their half-fins at the assembly site with welded seams without a subsequent tempering of these welded seams;
• and
• f) passing the one or more additional tubes through the particular take-up member of the tube walls, each of the one or more additional tubes has a sleeve mounted thereon, whereby each sleeve is prepared from a material that is not to be heat treated, is arranged in the penetration region of the tube wall and is connected with the tube, and connecting of the sleeve with the take-up member at the assembly site with a welded seam without a subsequent tempering of these welded seams.