Straightening roll for bar, tube and wire straighteners
Bar, tube and wire straightening · Roll arrangement and contour, plastic length, avoiding tube collapse and marking, roll steel and groove wear
A straightening roll forms part of a machine that bends stock to reduce residual curvature. Cross-roll arrangements also rotate and advance the stock, while grooved wire-feed rolls have a different contact and mounting task. Match the replacement to the machine drawing and stock rather than to a roll photograph alone.
Work rolls for bar, tube and wire straightening machines, including cross-roll (skew) straightener rolls and grooved rolls for wire and feed-line straighteners. Plate and sheet levellers, complete straightening machines and mill work rolls for rolling are outside this page.
CNFX editorial research · Sources checked October 18, 2026 · 5 sources
US patent 4,494,394 (priority 1981) explains that cross-roll straighteners use pairs of skewed rolls, at least one driven, so that the stock is rotated and advanced along a pass line and flexed beyond its yield point. It describes 2-roll machines that form a curved pass between a straight or convex roll and a concave roll, 5-roll machines with two cross-roll pairs and a single bending roll, and 6-roll machines with three cross-roll pairs whose central pass is offset to bend the stock between two supporting pairs. These are arrangements discussed in that patent, not a claim that any roll count guarantees a speed or straightness result. [1]
US patent 4,176,537 (priority 1977) states that the length of bar stressed beyond its elastic limit at any moment, the plastic length, affects straightening accuracy: "in general, the greater the plastic length, the straighter the resulting bar". It proposes identical rolls whose working surface is generated by two different hyperbolas so the pass has two bends, and notes that "tube straightening machines usually comprise several pairs of rolls; whereas bar straightening machines usually comprise only a single pair of rolls", tubes deforming more easily and being able to partially collapse. [2]
US patent 4,494,394 adds that where opposed rolls had substantially different contact angles with the stock, excessive slippage occurred for certain sizes and materials, and its three-pair arrangement aims to flex the stock uniformly while avoiding marking or collapsing. [1] Editorial note: send the machine maker's roll drawing or the existing roll, since contour, skew angle and diameter are matched to the machine and stock range.
Give the supplier the machine type and model (cross-roll 2-, 5-, 6- or multi-roll; wire or feed-line straightener), the roll drawing or a sample roll, stock type (bar, tube, wire), diameter and wall-thickness range, material and strength, temperature, surface finish requirement, throughput, and the roll steel, hardness and finish wanted.
02
Choose roll steel and check grooves and runout
Hero Way states its straightening rolls are used for welded and seamless steel tubes and solid round bars, and lists roll steels including GCr15, 9Cr2Mo, D2 (SKD11), Cr12MoV, Cr12Mo1V1, 86CrMoV7, MC3 and MC5 for customers to choose by working conditions. [4] Jungu, which supplies straightening rolls for multi-station cold-forming feed lines, says it checks wire diameter, groove radius, runout, bearing fit, surface wear and feed stability before quoting. [5]
US patent 10,987,711 (priority 2014) describes a roll straightener whose skewed rolls are carried in removable holding devices so the machine can be set up with a variable number of rolls for different requirement profiles, showing that roll mounting and interchangeability are part of the roll specification. [3]
The roll pass and stock range require the machine designer’s evaluation. A simple first-yield bending-radius estimate does not establish final straightness, roll loading or an acceptable tube-collapse margin; those depend on the actual section, material response and machine arrangement. Obtain the approved roll contour and setting procedure. [1][2]
03
Distinguish cross-roll tooling from wire-feed rolls
Hero Way lists straightening rolls for tubes and round bars; Jungu lists rolls for cold-forming wire-feed lines. These offerings are not interchangeable without the machine drawing. [4][5]
04
Check the roll contour and mounting interfaces together
The contour, roll body, bearing fit and holder define how the replacement sits in the straightener.
2 companies list this product among what they make. Company figures are quoted from each
company's own website; every card states where the relationship came from.
Jiangsu Hero Way Rolling Co., Ltd.
TBC
Lists straightening rolls for welded and seamless tubes and round bars in a range of roll steels.
Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.
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Compiled and source-reviewed by the CNFX editorial team.
Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review
· Page last updated 13 October 2026
Buyer questions
How does a cross-roll straightener straighten bars?
Per US patent 4,494,394, skewed driven rolls rotate and advance the stock through a pass that flexes it beyond its yield point. [1]
Why do tube straighteners use more roll pairs?
US patent 4,176,537 notes tubes deform more easily and can partially collapse, and that "tube straightening machines usually comprise several pairs of rolls". [2]
What steels are straightening rolls made from?
Hero Way lists GCr15, 9Cr2Mo, D2 (SKD11), Cr12MoV, Cr12Mo1V1, 86CrMoV7, MC3 and MC5. [4]
Sources and what still needs a direct check
Sources checked 2026-10-18. The patents describe specific straightener inventions and their background; Hero Way and Jungu describe their own rolls.
