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    Galvanizing Lines for Roll Formed Profiles

    ZTRFM Engineering Team · Encyclopedia of Roll Forming18August 19, 2026
    Roll formers run pre-galvanized or pre-painted coil. A continuous galvanizing line (zinc pot, CGL) is a steel mill, not a roll-forming accessory. Pot temperature and CGL line speed live on mill OEM sheets. Use EN 10346 coating mass language.
    Table of Contents
    1. Two different factories
    2. What the roll former actually eats
    3. Why there is no zinc-pot table here
    4. Post-gal after forming
    5. Buyer FAQ
    6. Related topics

    1. Two different factories

    Machine galvanizing in search often means a continuous galvanizing line (CGL): pickle, anneal, zinc or Zn-Al-Mg pot, air knives, coating-mass control. That is a steelworks. A roll-forming plant buys the coated coil and forms it cold. Mixing those RFQs buys neither a zinc pot nor a roll former.

    2. What the roll former actually eats

    The coating encyclopedias already define EN 10346 type codes (Z, ZA, AZ, AS, ZM) and mass as g/m² total both sides. PPGI/PPGL is organic paint over a metallic coat. Roll-gap wiki adds extra clearance for HDG and pre-paint so the film is not skinned. None of that is a galvanizing-line speed.

    Named forming hosts in this batch specify GI / PPGI / Aluzinc / G550 metallic-coated as incoming coil. Example: dual-fence 0.80 mm G550 metallic-coated and painted. The mill does not apply that zinc.

    3. Why there is no zinc-pot table here

    Pot temperature, knife pressure, line m/min, and annealing furnace kW are CGL engineering. They are not in the roll-forming process library. If you operate a coating line, quote from that mill’s OEM sheet — not from a purlin 15 kW host.

    4. Post-gal after forming

    Batch hot-dip of fabricated parts (tanks, not strip) is a third process. Some fence and structure shops galv after weld. That is a kettle, not a CGL, and not a roll former. Cut edges of pre-gal coil remain bare — design and coating mass (Z275 vs Z100) belong on the coil spec, not on an in-line zinc spray that this catalogue does not nameplate.

    5. Buyer FAQ

    Can you add a galvanizing machine behind the roof mill?

    Not as a catalogue option on these lines. Buy coated coil, or send fabricated parts to a galvanizer.

    Does heating the coil make zinc form easier?

    The cold-vs-hot wiki: heating coated strip is a process redesign, not a setpoint. Coating integrity is the issue.

    Is Aluzinc a galvanizing line?

    AZ / galvalume is a mill coating type. The clip order that uses 1 mm Aluzinc is still a parts order, not a CGL.

    Routing page. No CGL pot or speed table is published here. Coating mass language follows EN 10346.

    References

    • ZTRFM wiki: EN 10346; Surface finish and coating types; Zn-Al-Mg; PPGI/PPGL; Cold vs hot forming
    • ZTRFM wiki: Roll gap (HDG / paint clearance)
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