Superaustenitic steel "HCR" 1.4529 (A8)


  • Wealth of alloy elements such as molybdenum (about 6%), nickel (about 25%), nitrogen (about 0.20%) and chromium (about 20%) which in this are present in a superior quantity than in austenitic steels more commonly used to produce screws (AISI 304 and 316)
  • High content of manganese alloy elements up to 1%
  • Test voltage and tensile strength higher than standard Cr-Ni and Cr-Ni-Mo grades
  • High mechanical and physical performance, especially for the excellent protection against corrosion. For this last characteristic is also known as HCR (High Corrosion Resistant)
  • Excellent ductility and strength
  • Used in "particularly aggressive" environments such as pressure vessels, heat exchangers, water treatment even in the presence of chlorine - desalination - bleaching of paper pulp - hydrometallurgy - pharmaceutical and agri-food sector


For the assembly of insulated panels for roofs, UBB produced personalized HCR stainless-steel screws 1.4529, for wood and iron, with hexagonal and cylindric head of 5,5 and 6,3mm in diameter.
The client decided to use the fastening product for the realization of water treatments implants’ roofs.