Zirconium sheet corrugated pipe method, using two heat treatment and with temperature pressing molding; The first heat treatment is the integral stress relief heat treatment after welding the tube billet. The second heat treatment is the zirconium sheet bellows are pressed into shape after the use of the overall recovery of material properties of the heat treatment process, two heat treatment should be in the zirconium material inside and outside the surface coated with high temperature antioxidation paste, and in the inert gas, sealed electric heating treatment furnace; According to the thickness of zirconium material, the two heat treatment process conditions before and after pressing are: the first heat treatment, in the temperature range of 510℃~620℃ heat preservation 1~1.5 hours, with the furnace cooling; The second heat treatment, in the temperature range of 550℃~620℃ for 1~2 hours, with the furnace cooling. In order to ensure the quality of zirconium bellows, especially the quality of weld, to ensure the use of bellows performance.
As a kind of pipe 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 the power or heat pipe network, equipment and pipeline, equipment and equipment between the connection of compensation. 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 position movement; Eliminate vibration of equipment during startup, shutdown, or 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, Do not use in equipment or pipes.
Zirconium plate corrugated tube in the early stage of the tube billet material selection, selection of large non-ferrous metal manufacturers and good quality tube billet material, to ensure the use of low hydrogen and oxygen non-alloy zirconium plate, the key impurity element content H% (0.003%,0% (0.02%, zirconium plate elongation > 30%, and the delivery state is hot rolled, mechanical processing method to remove oxide skin, The surface should be free from obvious scratches, scratches and wear marks. In order to ensure the chemical composition and mechanical properties of the material, the quality certificate of the raw material should be carefully checked before forming the zirconium bellows, and the key items of the raw material should be reinspected to verify that it meets the above requirements.
