Zirconium-coated steel plates and chemical device elements produced with such plates

A method for producing coated assembly parts intended for the production of a chemical or nuclear device element comprising a zirconium or zirconium alloy coating, wherein said assembly parts include a steel support part and at least one zirconium or zirconium alloy coating, the method consisting essentially of:

• (a) forming an initial assembly including a steel support part, a zirconium or zirconium alloy coating, and at least one brazing material between the support part and the coating, wherein said brazing material is an alloy including silver and copper;
• (b) inserting the initial assembly into a brazing chamber with a controlled atmosphere;
• (c) forming a controlled atmosphere in said chamber;
• and
• (d) reheating said assembly to a temperature at least equal to the melting temperature of said brazing material, so as to attach the zirconium coating to the support part;
• wherein prior to forming said initial assembly, a titanium or titanium alloy layer is deposited on said zirconium or zirconium alloy coating, and wherein said coating is placed so that the titanium- or titanium alloy-coated surface thereof is in contact with said brazing material, and
• wherein said brazing material includes silver and copper and is at least one selected from the group consisting of binary alloys having a eutectic composition with Ag between 67% and 75%, Ag—Cu—Zn ternary alloys, Ag—Cu—Zn—Sn quaternary alloys, and Ag—Cu—Zn—Cd quaternary alloys, wherein the brazing temperature is lower than the austenitisation temperature of the steel of the support.