Published July 2021

Datasheet 12: Hot Dip Galvanized Steel Castings

Galvanizing of steel castings is covered by BS EN ISO 1461 : 2009.

Hot dip galvanizing of cast iron provides excellent protection from corrosion and the coating is applied by immersion in molten zinc at 450°C forming a tough, adherent coating which is bonded to the base metal by a series of zinc-iron alloy layers overlaid with free zinc.

HDG Datasheet 12 - Hot Dip Galvanized Castings

If any problems are experienced with hot dip galvanized castings, they can usually be traced back to the surface condition of the casting. Causes include burnt-on moulding sand, oxides from the annealing process, traces of graphite or pollution, or surface flaws such as shrinkage holes.

This datasheet offers information on the following:

  • types of castings
  • castings surface preparation for hot dip galvanizing
  • design of cast iron sections

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