Leveling System
High Strength Leveling Machine
Engineered to eliminate internal stress, edge waves, and coil curl in ultra-high yield strength steel plates and sheets.
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Industrial Processing Machinery Catalog
Featured Metal Leveling, Slitting & Cut-to-Length Machinery
Explore high-rigidity straighteners, heavy-gauge multi-roll levelers, and automated continuous coil processing lines manufactured directly in our 40,000 m² Wuxi facility.
Straightening Unit
Professional Straightening Machine
High-rigidity multi-roll configuration for cold and hot-rolled medium-to-thick wide plates with precision motorized roll gap adjustment.
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Moving Shear
Hot Rolled Plate Moving Shear Line
Continuous dynamic shearing traveling synchronously with heavy plate feed to maximize productivity without surface indentation.
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Stainless CTL
Stainless Steel Cut To Length Line
Non-marking, 6-Hi leveling with polyurethane backup rolls and automatic air-cushion sheet stacking for mirror-grade stainless finishes.
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Combined Line
Combined Slitting & CTL Line
Dual-function layout combining heavy-duty longitudinal rotary slitting and transverse leveling shear to conserve shop floor footprint.
Technical Specs
Slitting Plant
HR Sheet Slitting & Recoiling Line
High-torque arbor drive and precision shimless tooling setups engineered for burr-free edge retention and uniform strip tensioning.
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Heavy-Gauge Slitter
Heavy Duty Strip Recoiling Line
Designed for structural pipe mills and roll formers requiring heavy-gauge strip processing up to 25mm thickness with automated scrap winders.
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Heavy CTL
Continuous Plate Shearing Line
Integrated decoiling, wide plate leveling, optical high-speed length metering, hydraulic shear, and heavy-payload automated magnetic stacker.
Explore Line Details40+ Yrs
Metallurgical Machinery Experience
40,000m²
Self-Owned Manufacturing Base
30+ Countries
Global Metallurgical Installations
45M RMB
Capitalized Engineering Stability
Executive Whitepaper: Industrial Mechanics of Wide Plate Straightening
In contemporary metallurgical processing, plate shape defects—manifested as long crossbow, center buckle, edge waves, coil set, and severe residual stress gradients—represent the single largest source of downstream manufacturing downtime in laser cutting, robotic welding, and automated stamping. When processing wide plates spanning widths from 1,500 mm up to 4,200 mm and thicknesses from 6 mm to over 50 mm, simple three-roll or five-roll bending mechanisms prove entirely inadequate. Wide Plate Straighteners engineered by China's Tier-1 industrial leaders utilize alternating elastoplastic cyclical bending over progressive multi-roll cassettes (ranging from 7, 9, 11, up to 21 precision work rolls) to stretch cross-sectional fibers past their yield threshold, systematically normalizing internal stress distribution across the entire web.
Established in the early 1980s in Wuxi, Jiangsu—the metallurgical machinery heartland of the Yangtze River Delta—Wuxi Jianfa Machine-Building Co., Ltd. has spearheaded China's technological evolution from rigid manual screw-down leveling machines to intelligent, servo-hydraulic 4-Hi and 6-Hi Wide Plate Levelers equipped with dynamic roll bending (crowning), hydraulic gap control (HGC), and telemetry-driven closed-loop thickness and flatness feedback. As a national key developing enterprise, Jianfa combines 40,000 square meters of heavy machining bays, deep fabrication discipline, and complete ISO9001 and CE conformity to serve metal fabricators and steel service centers across Europe, North America, Southeast Asia, the Middle East, and Latin America.
Metallurgical Engineering Standards
Technological Roadmap & Next-Gen Straightening Mechanics
Understanding the elastoplastic transition, hydraulic roll crowning, and multi-tier backup roll configurations that define modern Chinese high-rigidity leveling technology.
Elastoplastic Curvature Normalization
The core physics of plate leveling dictates that plate material must be subjected to repeatedly alternating reverse bending with decreasing amplitude. The initial rolls apply maximum plastic deformation (up to 75%–85% of fiber yield) to extinguish prior stress memory, while exit rolls enforce strict elastic recovery to guarantee absolute residual flatness under 1.0 mm/m².
- Elimination of cross-sectional tension delta
- Laser-cutting warp prevention guarantee
- Stabilized yield profiles across wide plates
Servo-Hydraulic Gap Control (HGC)
Replacing traditional electromechanical worm gears, Jianfa's modern straighteners integrate dynamic high-response proportional servo valves with magnetostrictive linear transducers. This allows independent four-corner hydraulic roll gap management, enabling real-time tilt, wedge leveling, and instantaneous roll overload relief under hydraulic cushion protection.
- Positioning accuracy within ±0.01 mm
- Instantaneous anti-jamming pressure relief
- Digital memory for material recipe recalls
Dynamic Roll Bending & Individual Crowning
Under colossal leveling forces (often exceeding 25,000 kN), even massive forged alloy work rolls experience elastic deflection. Jianfa integrates segmented motorized backup roll flights with independent hydraulic wedge jacks. This allows operators to deliberately impart convex or concave camber to the work rolls, targeting stubborn center buckles or edge waves across ultra-wide sheet.
- Segmented backup roll assemblies
- Elimination of localized wave patterns
- Continuous support prevents roll deflection
| Equipment Model Series | Applicable Plate Thickness | Maximum Plate Width | Work Roll Setup / Pitch | Target Yield Strength | Primary Industrial Sector |
|---|---|---|---|---|---|
| WPS-Light / Precision | 0.5 mm – 4.0 mm | 1,250 mm – 2,000 mm | 19–23 Rolls / Ø45–Ø65 mm | Up to 550 MPa | Automotive Skins, Appliance Enclosures, Stainless Facades |
| WPS-Medium Heavy 4-Hi | 3.0 mm – 16.0 mm | 1,500 mm – 2,500 mm | 11–15 Rolls / Ø90–Ø160 mm | Up to 800 MPa | Commercial Vehicle Chassis, Telescopic Booms, Containers |
| WPS-Heavy Plate 4-Hi | 10.0 mm – 32.0 mm | 2,000 mm – 3,200 mm | 9–11 Rolls / Ø180–Ø260 mm | Up to 960 MPa (Q960/Weldox) | Mining Excavators, Bridge Girders, Rail Bogies |
| WPS-Ultra Heavy Marine | 20.0 mm – 60.0 mm+ | 2,500 mm – 4,200 mm | 7–9 Rolls / Ø300–Ø420 mm | Up to 1100 MPa | Shipbuilding Hulls, Offshore Wind Monopiles, Pressure Vessels |
Global Downstream Deployment
Specialized Industrial Application Scenarios
Where dimensional precision and zero-residual stress are mandatory: How Jianfa Wide Plate Straighteners power high-stakes manufacturing worldwide.
Shipbuilding & Marine Structures
Naval and commercial vessels require massive AH36/DH36 grade steel plates. Straightened plates eliminate weld root gaps and prevent longitudinal hull distortion during automated sub-arc panel welding.
Wind Turbine Towers & Monopiles
Wind tower cans and offshore monopile transition pieces require thick wide plate rolled into exact cylinders. Residual stress removal prevents ovality and fatigue cracking in harsh ocean environments.
Heavy Earthmoving & Mining (Yellow Goods)
Excavator booms, dump truck beds, and crane telescopic jibs built from high-strength wear-resistant steels (Hardox, NM450) require immense roll load capacities to avoid edge deformation during flame cutting.
Pressure Vessels & Chemical Storage
Petrochemical reactor shells and cryogenic tanks demand uniform grain structure and strict circular tolerances. Straightened plates ensure clean edge prep and prevent localized stress concentration.
High-Speed Rail Bogies & Bridges
Steel bridge orthotropic decks and railway locomotive side frames necessitate precision plates that will not spring back after multi-axis fiber-laser chamfering or high-energy plasma cutting.
High-Output Steel Service Centers
Toll processing facilities handling diverse customer requirements benefit from programmable NC presets, quick roll-change cassettes, and rapid cross-section changeover from standard carbon to stainless.
Supply Chain Resilience
Why Source From Wuxi: China's Metallurgical Machinery Epicenter
Vertical integration, dedicated heavy foundries, and the Yangtze River Delta logistical corridor give Jianfa unassailable cost and delivery advantages.
100% In-House Mechanical Machining & Strict Quality Control
Unlike trading intermediaries or assembly-only contractors, Wuxi Jianfa controls the entire engineering chain inside its 40,000 m² plant. All major structural elements—including massive monolithic cast steel housings, fabricated stress-relieved bed frames, and precision roll chocks—are machined on floor-type CNC boring and milling centers under rigorous metrology control.
Work rolls are forged from premium 42CrMo, 60CrMoV, or 9Cr2Mo alloy steels, undergoing deep induction hardening, cryogenic stabilizing treatment, and precision CNC cylindrical grinding to achieve surface hardness of HRC 60–64 and surface roughness Ra ≤ 0.2 µm. This metallurgy prevents roll spalling and scratching even under severe abrasive mill scale conditions.
Yangtze River Delta Industrial Cluster
Wuxi's metallurgical machinery ecosystem provides instant access to specialized tier-one component makers: Rexroth and Parker compatible hydraulics, Siemens and Inovance servo systems, and SKF/FAG heavy spherical roller bearings within a 50 km radius.
Unrivaled Deepwater Sea-Freight Logistics
Located directly adjacent to the Shanghai and Taicang container and break-bulk seaports, Jianfa facilitates seamless heavy-lift maritime transport for massive monolithic straightener frames without expensive inland transit bottlenecks.
Full Pre-Shipment Commissioning
Every straightener and complete cut-to-length line undergoes 100% mechanical pre-assembly, dry-cycle running tests, and full hydraulic pressure verification on our factory floor before anti-corrosion barrier packing and container loading.
E-E-A-T Reliability Standards
International Compliance & Overseas Engineering Support
Strict safety certifications, documented quality audits, and full-lifecycle field service teams dedicated to overseas buyers.
CE Machinery Directive
Compliant with EN ISO 12100 & EN 60204-1 safety standards
ISO 9001 Quality System
Full traceability on raw alloys, forging billets, and hydraulic tests
On-Site Commissioning
English-speaking field engineers dispatched worldwide for startup
Remote Tele-Diagnostics
Encrypted VPN PLC gateways for 24/7 technical monitoring and tuning
Comprehensive Engineering Guide
Frequently Asked Questions: Wide Plate Straightening Technology
Authoritative answers on leveling mechanics, roll force calculations, high-yield material handling, and equipment selection.
What is the mechanical difference between a 4-Hi and a 6-Hi wide plate straightener?
A 4-Hi leveler consists of two tiers: the upper and lower rows of work rolls, each directly supported by rows of backup rolls. This design delivers colossal rigidity and is optimal for medium-to-thick plates (typically 6 mm to 50 mm+) where high bending forces are mandatory. A 6-Hi leveler inserts a tier of intermediate rolls between the work rolls and backup bearings. This completely prevents backup roll contact marks and zebra striping from transferring onto sensitive surfaces, making 6-Hi machines the industry benchmark for mirror-finish stainless steel, high-gloss aluminum, and automotive-grade exposed skin sheets.
How does Wuxi Jianfa ensure wide plates do not curl or warp after laser cutting?
Post-laser-cutting distortion is caused by unequal residual stresses trapped within the top and bottom surfaces of the plate. When the laser's thermal beam cuts through the metal, these unbalanced stresses release instantaneously, causing parts to spring up and collide with the laser cutting head. Jianfa wide plate straighteners subject the plate to precisely calibrated cyclic plastic bending that extends deep into the core (70%–80% plastic deformation in the entry passes), balancing compressive and tensile stresses symmetrically across the neutral axis. This produces totally dead flat, stress-free plates that stay planar after intense thermal cutting.
How is roll pitch and roll diameter calculated for high-strength steel (e.g., Q690, Weldox, Hardox)?
Leveling high-yield materials requires significantly smaller roll diameters and tighter roll pitches than mild carbon steel to achieve the required plastic bending radius without exceeding motor torque thresholds. However, smaller rolls deflect more readily under load. Jianfa balances this via high-modulus forged alloy roll shafts (60CrMoV/9Cr2Mo) backed by multi-tiered, heavy-duty spherical roller backup bearings and automated hydraulic cambering. Our application engineers use dedicated finite element leveling simulations to determine the precise roll count, diameter, and backup spacing based on your specific yield strength curve and maximum thickness.
Can a single wide plate straightener be integrated into both a cut-to-length line and operated as a standalone unit?
Yes. Many heavy metal fabricators operate Jianfa straighteners inline with decoilers, crop shears, and stackers, while also maintaining entry and exit roller conveyor bypass tables. This configuration allows the machine to function either as an inline leveler for decoiled continuous steel strip or as a bypass standalone plate straightener for discrete sheared plates, flame-cut structural blanks, or warehouse stock sheets.
What information should overseas buyers provide to receive an engineered technical layout and quotation?
To provide an exact engineering proposal, our design office requires: (1) Material grade and yield strength spectrum (e.g., S235 up to S960QL / Hardox 450); (2) Thickness range (minimum to maximum, mm); (3) Width range (mm); (4) Plate condition (coil strip vs. discrete cut plates); (5) Target operating speed (m/min); (6) Surface sensitivity requirements (commercial HR finish vs. 2B stainless); and (7) Factory electrical voltage, frequency, and plant footprint constraints.
Direct Factory Catalog
Explore Our Full Range of Metal Processing Solutions
Factory-direct manufacturing from Wuxi Jianfa. Browse each specialized line model below and request immediate technical drawings.
Flying Shear
High-Quality Professional Flying Shear Line
Non-stop continuous rotary and moving blade shearing engineered for ultra-high throughput coil processing plants.
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Slitting Systems
Precision Metal Slitting Line Manufacturer
Complete slitting line solutions featuring quick-change arbor heads, tensioning stands, and automated coil unloading cars.
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CE Certified CTL
CE Certification Cut to Length Line
Fully compliant European standard cut-to-length lines with integrated multi-roll precision leveling and high-speed stackers.
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Leveler Unit
Heavy Plate Leveling Machine
Heavy-duty multi-roll leveler with independent roll flight adjustment designed for extreme yield hot rolled plates.
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Straightener
Industrial Plate Straightening Machine
Continuous motorized gap adjustment for rapid plate feeding ahead of blanking, robotic welding, or laser profiling lines.
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Moving Shear
Hot Rolled Moving Shear System
Engineered for high sheet volume throughput where stop-and-go hydraulic shears cause undesirable line bottlenecks.
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Coil Slitting
HR Uncoiling-Slitting-Recoiling Line
Robust slitting and recoiling line designed for tube mill feed and roll-forming master strip manufacturing.
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Heavy-Duty CTL
HR Sheet Uncoiling-Leveling Line
A unified heavy line that uncoils, levels, cuts to precise millimeter length, and auto-stacks plate on pallets.
Request Technical QuoteConsult Wuxi Jianfa's Metallurgical Specialists
Speak directly with experienced heavy machinery design engineers—not third-party sales representatives. We provide complete coil-to-sheet layouts, finite-element leveling load calculations, and turnkey export quotes within 24 business hours.
Direct Tel/WhatsApp: +86 139 2116 6015
Sales Office: [email protected]