FR-180 Large-Diameter Tube & Bar Straightening Machine – Engineered for <0.3 mm/m Straightness and 0.05 mm Roundness
17-roller horizontal straightening system delivers consistent geometric precision for tubes up to φ180 mm and bars up to φ90 mm – ideal for oil & gas pipelines, hydraulic cylinders, structural applications, and heavy industrial processing.
Precision Straightening for Large-Diameter Tubes and Bars
FangRong’s FR-180 straightening machine is a 17-roller horizontal straightening system engineered for high-precision correction of metal round tubes and bars. With a maximum straightening pipe diameter of φ180 mm and a maximum bar diameter of φ90 mm, it delivers:
Straightness: ≤0.3 mm/m
Roundness tolerance: ≤0.05 mm
The machine processes tubes from φ60 mm to φ180 mm and bars from φ45 mm to φ90 mm, with straightening lengths ranging from 2 to 15 meters.
Key Technical Specifications
Parameter | FR-180 Specification |
Max straightening diameter (tube) | φ180 mm |
Min straightening diameter (tube) | φ60 mm |
Max bar diameter | φ90 mm |
Straightening roller sets | 17 sets |
Straightness tolerance | ≤0.3 mm/m |
Roundness tolerance | ≤0.05 mm |
Operating speed | 0 – 30 m/min (variable frequency) |
Main motor power | 37 kW |
Frequency converter | 45 kW |
Machine weight | 25,000 kg |
Dimensions (L×W×H) | 4,200 × 1,800 × 1,500 mm |
How the 17-Roller System Achieves High Precision
The FR-180 utilizes 17 sets of precision rollers arranged in a horizontal configuration. The straightening principle operates by feeding the round tube or bar through the center of the rollers. A motor, multi-stage reducer, and variable frequency speed control drive the rollers through bilateral synchronous transmission via pulleys and chains, propelling the workpiece forward to complete the straightening process.
Key design features include:
Frequency conversion speed control – enables precise adjustment from 0 to 30 m/min to match material characteristics
Digital display handwheel adjustment – each full turn moves the roller by 1 mm, allowing fine-tuning of roll positions
Polishing and rounding effect – the straightening process also provides a certain degree of surface refinement and roundness correction
Built for Heavy-Duty Industrial Applications
For applications requiring even larger diameters – up to 1100 mm – FangRong offers heavy-duty multi-roll and press-type straightening systems that deliver consistent ≤0.3 mm/m straightness for large-diameter tubes in oil & gas pipelines, structural columns, power generation, and shipbuilding.
These larger systems incorporate:
Heavy-duty rolls and hydraulic press systems – designed for high-tonnage correction of extreme curvature
Multi-roll or rotary straightening – with precision roll contouring to maintain roundness and prevent ovalization
Closed-loop force control – compensates for material variations across carbon, alloy, and stainless steel grades
Extended infeed/outfeed supports – with powered roller tables for handling tubes up to 18 meters in length
Applications Across Critical Industries
Industry | Application |
Oil & Gas | Line pipe, casing, drill pipe, risers |
Construction | Structural columns, piling, bridge supports |
Power Generation | Boiler tubes, heat exchanger sections |
Shipbuilding | Hull structures, piping systems |
Hydraulics | Cylinder tubes, precision piston rods |
General Engineering | Shafting, structural sections, heavy machinery components |
Why FangRong Straightening Machines Deliver Consistent Results
Precision-ground roller systems – ensure consistent contact and even pressure distribution
Variable frequency drive – allows optimization of straightening speed for different materials and diameters
Digital display adjustments – provide repeatable, accurate roll positioning
Heavy-duty construction – built for continuous, high-volume operation
Surface protection – polished or coated rolls minimize marking on finished surfaces
Conclusion
For manufacturers requiring ≤0.3 mm/m straightness and ≤0.05 mm roundness on tubes up to φ180 mm and bars up to φ90 mm, the FangRong FR-180 17-roller straightening machine delivers precision, reliability, and efficiency. With variable speed control, precise roll adjustment, and robust construction, it is engineered to meet the demanding straightening requirements of oil & gas, hydraulic, structural, and heavy industrial applications.
Contact FangRong to discuss your tube and bar straightening requirements.
Know More About Us FangRong Metallurgical Equipment Manufacturer in China since 1998. Professional in Metal Straightening machine, Cold Drawing machine, Push Pointer Drawing Machine, Automatic Three Lines Drawing Machine, Thread rolling machine, Tube-end shrinking machine, Pointing Machine, Core pipe machine, Polishing Machine etc.
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Keywords: Large-diameter tube straightening machine, FR-180 straightening machine, 17-roller straightener, ≤0.3mm/m straightness, 0.05mm roundness, tube straightening, bar straightening, heavy-duty straightening, FangRong straightening machine.
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