The production of galvanized casting tees (often malleable iron) involves casting the raw tee, cleaning, heat treatment for malleability, hot-dip galvanizing, and final threading. The process creates a protective zinc-iron alloy layer through a 450±5° molten zinc bath, ensuring high corrosion resistance.Key Production Stages
1.Casting/Foundry: Molten iron is poured into sand molds to form the tee shape. Castings with smooth surfaces produce better, more uniform zinc coatings, say Galvanizing Castings.
2.Heat Treatment (Annealing): Castings are heated to make them malleable and ductile, essential for plumbing applications.
3.Surface Preparation (Cleaning): Fittings are cleaned using pickling (acid) to remove rust/scale and degreased to ensure proper adhesion of the zinc.
4.Hot-Dip Galvanizing (HDG): The cleaned casting is immersed in a pot of molten zinc at roughly 450--460C. This forms a metallurgical bond between the steel and zinc, explained in Galvanized Pipe Production Process.
5.Cooling and Inspection: The tee is cooled and checked for coating uniformity, defects, and surface smoothness.
6.Threading and Finishing: Threads are cut into the galvanizedtee (if not done pregalvanizing) to ensure compatibility with piping systems, as shown on Quora.
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