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    Tube Straightening Machines

    ZTRFM Engineering Team · Encyclopedia of Roll Forming20August 19, 2026
    Straightening on ZTRFM files is usually a station on a forming or CTL line, not a standalone bar straightener mill. U-stud, square-tube, special-section and heavy CTL each name their own straightener. A dedicated tube-straightener kW is not published here.
    Table of Contents
    1. Where straightening actually sits
    2. Named stations on forming / CTL lines
    3. What sits on other quotations
    4. Ask for the host first
    5. Buyer FAQ
    6. Related topics

    1. Where straightening actually sits

    Searchers want a machine that takes bow out of tube or profile. On the process library that work is almost always a straightener / leveler station in front of or after the stands, or a precision straightener in a CTL cell. There is no named mill in this batch titled only “tube straightening mill” with a locked kW. A two-roll rotary straightener table would be a different vendor class.

    2. Named stations on forming / CTL lines

    HostStraighten language on that quotation
    U-stud (hero)Straightener device required before 15 stands; 0–40 m/min; 5.5+5.5 kW form
    Square/rect punch + laser line~40 stands, 5 straighteners, 22 kW, 6–12 m/min, 2 mm, 6 kW laser, 380 V/60 Hz — straighteners are part of that mill, not of the ZP-S40 laser recipe mill
    Special section22 stands Ø80, straighten, 20–30 m/min, main 22 kW
    Heavy CTL 5×16004-high leveler 15×Ø125, 132 kW DC, then servo precision straighten 30 kW, then H13K shear
    Leveling-shear cell15-roll Ø115, 45 kW, 15 m/min, 3–6 × 2000 mm — flattens strip, not a round tube
    Standalone leveler quotation B≤600 mm, 0.35–3.0 mm, motor 3.0 kW — leveler only

    ERW 254 mill (φ88.9–254, 3–8 mm) sizes after weld; the 132 kW DC figure is the heavy CTL leveler, not that mill.

    3. What sits on other quotations

    • A two-roll bar straightener for hot-rolled rounds — different vendor class
    • Replacing ERW sizing stands with a “straightener mill” name
    • Using CTL 30 kW precision straighten as a tube-mill accessory number

    4. Ask for the host first

    1. Round ERW vs lockform vs ZP-S40 laser recipe vs punch+laser square vs open profile
    2. OD / side / thickness
    3. Whether bow is in the strip (leveler) or in the closed tube (post-weld straighten)
    4. If you truly need a standalone rotary straightener, that is a different vendor class — ask them for their ratings

    5. Buyer FAQ

    Is a leveler a tube straightener?

    A leveler flattens strip. Tube straighteners work on the closed section. Different rolls.

    Does U-stud 40 m/min include straightening?

    The sheet requires a straightener in the line. Speed is the host band, not a straightener-only rating.

    Can I buy just the five straighteners from the punch-plus-laser mill?

    Ask as a spare/tooling question. They are specified on that ~40-stand punch + laser host, not on the ZP-S40 recipe mill.

    No standalone tube-straightener rating is published. Station counts above stay on their forming or CTL hosts.

    References

    • Process library: U-stud; Square-tube punch + laser; Special section; Heavy CTL; Leveling-shear; Standalone leveler
    • Process library: ERW 254 (weld mill, not this straightener quotation)
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