GI pipe vs HR pipe: what to put on the enquiry
Zinc-coated GI for service runs and corrosion resistance; black HR for frames, scaffolding, and structural hollow sections—here’s how to avoid ordering the wrong book.
Galvanized (GI) pipe is built around zinc protection—think plumbing, irrigation, fire lines, and outdoor runs where rust is the enemy. Hot-rolled (HR) pipe and sections are the workhorses for fabrication, columns, and square/rectangular hollow sections when your drawing calls out SHS or RHS sizes.
Nominal bore and wall matter: GI is often quoted in inches up to large infrastructure sizes; HR round runs from small bore through industrial diameters, and square/rectangular profiles top out at the heavy sections in our catalogue. If your spec mixes inches and millimetres, put both on the enquiry so we match stock.
Need a non-catalogue length or a jumbo GI run? That’s a conversation, not a web form—our team routes those to the pipe desk with your timeline and site contact.
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