Zirconium plate corrugated tube method, using two heat treatment and with temperature pressing molding; The first heat treatment is to adopt the integral stress reduction heat treatment after the billet is welded. The second heat treatment is a heat treatment process for the overall recovery of material properties after the zirconium plate bellows are pressed and formed. Both heat treatments should be carried out in a sealed electric heating furnace filled with inert gas and coated with high-temperature anti-oxidation paste on the inner and outer surfaces of zirconium materials. According to the thickness of zirconium material, the two heat treatment process conditions before and after pressing are as follows: the first heat treatment, in 510℃~620℃ temperature range insulation 1~1.5 hours, with the furnace cooling; The second heat treatment, in the temperature range of 550℃~620℃ insulation 1~2 hours, with the furnace cooling.
So as to ensure the quality of zirconium bellows, especially the quality of the weld, to ensure the use of bellows performance.As a kind of pipeline compensation component, bellows expansion joint is widely used in electric power, petrochemical, heating, iron and steel, urban construction and other fields. Its role is in power or heat pipe network, equipment and pipeline, equipment and equipment between the connection play a compensating role. The bellows expansion joint with its axial expansion or Angle change to compensate the pipeline system or equipment due to temperature difference (or mechanical movement) caused by the position movement; Eliminate vibration of equipment when starting, stopping or under normal operating conditions. Corrugated pipe, therefore, the stress distribution must be uniform, can't there is stress concentration, non-ferrous metal zirconium plate corrugated pipe has good corrosion resistance, but in the process of production, the most common of which are caused by stress concentration peaks and troughs R segmental arc and weld fusion line with parent metal micro cracks, defects of corrugated pipe is not allowed to repair in the standard, Can not be used in equipment or piping. Zirconium tube billet after reasonable material selection, pipe welding completed by using the overall stress, heat treatment and forming by whole eliminating stress again after heat treatment process, but the heat treatment furnace should be filled with inert gases, sealed performance is good, electric furnace, in order to prevent the corrugated tube in the heat treatment process of zirconium absorb hydrogen, oxygen embrittlement, make zirconium uniform stress distribution, ensure the quality of zirconium, Especially the weld quality, to ensure the use of zirconium bellows performance.
