Featured Heavy & Mid-Thickness Coil Processing Lines
Certified under European CE directives. Each line incorporates high-torque uncoiling, multi-roll plastic deformation leveling, hydraulic shears, and automated material handling.
High-Quality Professional Flying Shear Production Line
Synchronous moving shear cuts plates on the fly without stopping coil motion, maximizing cycle yield for heavy plate lines.
Explore Equipment
China Manufacturer Of Slitting Line Manufacturers, Supplier
Ultra-rigid rotary cutter heads engineered for tight width tolerances, clean edge slitting, and heavy scrap winding.
Explore Equipment
CE Certification Manufacturer Of Cut to Length Line Manufacturer, Suppliers
Standardized European safety compliance, programmable PLC length gauging, hydraulic clamp shear, and auto-stacking.
Explore Equipment
High Strength Leveling Machine
Eliminates coil set, crossbow, and localized edge waves in hot-rolled high-tensile steels up to 960 MPa yield strength.
Explore Equipment
Professional Straightening Machine
Heavy-gauge multi-roller flattener configured for structural steel plates, eliminating springback prior to laser cutting.
Explore Equipment
Hot Rolled Plate Moving Shear Line
Engineered for medium and thick plate uncoiling and non-stop shear division up to 20mm thickness at high cycle speeds.
Explore Equipment
Stainless Steel Coil Uncoiling-Leveling-Shearing-Stacking Line
6-Hi roller geometry with protective intermediate rolls and anti-scratch PU coatings for 2B, BA, and No.4 finishes.
Explore Equipment
Hot-Rolled Coil Uncoiling-Slitting-Leveling-Cut-To-Length-Stacking Production Line
Dual-capability production line capable of simultaneous edge trimming, multi-strip slitting, and precision cross-cutting.
Explore EquipmentPhysics of Mid-Thickness Plate Straightening: Eliminating Residual Stress
When uncoiling steel plates ranging from 6.0 mm to 25.0 mm, inner winding tension, thermal gradient histories, and high yield limits induce severe internal stress fields that jeopardize downstream laser cutting and robotic welding.
Alternating Plastic Bending
The uncoiled strip is subjected to decreasing alternating curvatures between staggered upper and lower rolls. By forcing 75% to 85% of the outer fiber cross-section into plastic yielding, mechanical memory is erased, equalizing top and bottom strain gradients.
- neutral axis offset prevention
- Deep fiber plasticity up to 85%
- Progressive decay wrap angle curve
Individual Roll Deflection Control
Under heavy plate loads exceeding 1500 kN, standard shafts experience elastic deflection that causes edge waves or center buckles. Jianfa integrates multiple motorized backup roll cassettes beneath the work rolls to create controlled crown profiles.
- Multi-point mechanical wedge adjustment
- High-rigidity forged 42CrMo back-up shafts
- Micro-meter crown correction under load
Hydraulic Servo Gap Regulation
Entry and exit roll intermesh gaps are dynamically actuated by proportional servo-hydraulic cylinders equipped with magnetostrictive linear encoders, ensuring repeatable positioning down to ±0.01 mm irrespective of steel thickness variations.
- Response time < 15 ms per axis
- Closed-loop MTS position feedback
- Overload hydraulic dump safety triggers
What Determines Mid-Thickness Straightener Prices?
Procurement prices for mid-thickness plate straighteners vary from $85,000 for standard commercial units to upwards of $450,000 for high-tensile automated lines. Here is the verified engineering breakdown behind capital allocations.
| Configuration Tier | Thickness & Width Range | Roll Architecture & Metallurgy | Drive & Hydraulic System | Est. Factory Price (USD) |
|---|---|---|---|---|
| Standard Industrial (4-Hi) | 4.0mm – 12.0mm × 1600mm (Yield ≤ 355 MPa) |
11 to 13 rolls, 60Si2Mn / GCr15 forged, induction hardened 58–60 HRC, passive backup blocks | Single AC main motor, combined distribution gearbox, mechanical worm-gear screw-down | $85,000 – $145,000 |
| Precision Heavy-Duty (4-Hi / 6-Hi) | 6.0mm – 16.0mm × 2000mm (Yield ≤ 550 MPa) |
13 to 17 rolls, 42CrMo forged & sub-zero treated, 60–62 HRC, motorized crown-adjustable backup rolls | Dual inverter-driven AC motors, universal joint shafts, electro-hydraulic servo intermesh control | $160,000 – $260,000 |
| High-Tensile Armor / High-Yield (6-Hi) | 8.0mm – 25.0mm × 2500mm (Yield ≤ 960+ MPa) |
17 to 21 rolls, vacuum-degassed Cr12MoV/D2 equivalent, chrome-plated work rolls, intermediate support cassettes | Individual roll planetary gear drives, Rexroth proportional servo valves, real-time laser closed-loop flatness feedback | $290,000 – $480,000 |
Work Roll Metallurgy & Heat Treatment
The single greatest driver of straightener life. Premium deep-hardened 42CrMo rolls undergoing dual-frequency induction hardening maintain structural integrity under high cyclic bending forces without roll flaking or micro-cracking.
Drive Transmission Topologies
Entry lines use split-pinion gearboxes which share load unevenly. Precision Jianfa straighteners employ dedicated planetary gear reducers per roll with cardan drive shafts, preventing drive train wind-up and roll chatter marks on sensitive plates.
Leveling Algorithm & Automation
Advanced recipe management calculates roll insertion depths automatically based on strip yield, modulus of elasticity, and thickness. Reducing setup time from 30 minutes to 45 seconds drastically shifts Total Cost of Ownership (TCO).
China Factory 4.0: Supply Chain Resilience & Vertical Integration
Founded in the early 1980s in Wuxi, Jiangsu, Wuxi Jianfa Machine-Building Co., Ltd. operates a 40,000 m² heavy-machinery manufacturing complex. We achieve unmatched cost-to-performance by controlling 90% of machining operations in-house.
Wuxi Metallurgical Cluster
Located in the epicenter of China's heavy precision machining industry. Within a 30 km radius, we source ISO-certified specialized forgings, bearing assemblies, and heat treatment lines.
In-House Gantry Machining
Precision CNC gantry milling machines machine straightener machine frames, bearing housings, and upper crowns in a single clamping setup to preserve mechanical parallelism.
45M RMB Registered Capital
Financial stability backing long-cycle EPC line projects. Overseas buyers benefit from escrow safety, rigorous pre-shipment FAT run tests, and secure component sourcing buffers.
Export Logistics to Port
Direct expressway connectivity to Shanghai Seaport (less than 130 km). Heavy machinery breaks down into standard open-top or flat-rack containers with anti-corrosion VCI barrier wraps.
Engineered Solutions for Demanding Downstream Sectors
Different industries present unique metallurgical and dimensional challenges. Wuxi Jianfa custom-configures mid-thickness uncoiling and straightener lines to match exact application tolerances.
Automotive & Heavy Truck Chassis
Processing hot-rolled microalloyed high-strength steels (e.g., SAPH440, QSTE700TM). Requires strict retention of mechanical elongation properties while delivering cut sheets with flatness under 1.5 mm/m for robotic welding fixtures.
Shipbuilding & Marine Structures
Handling heavy marine grade AH36, DH36, and EH36 plates up to 25 mm thickness. Overcomes pronounced edge curl and high coil set, enabling seam tracking in multi-torch sub-arc submerged welding gantries.
Pressure Vessels & Boilers
Flattening SA516 Gr.70 and boiler quality plates before 3-roll and 4-roll CNC plate bending machines. Prevents irregular ovality during cylinder rolling by homogenizing cross-sectional elasticity.
Heavy Earthmoving & Mining Equipment
Mitigating intense work-hardening and yield resistance in wear-resistant plates (NM400, NM450, Hardox equivalents). Features hydraulic power packs delivering extreme clamp torque and anti-slip drive traction.
Structural Steel & Bridge Beams
Precision cross-cutting of S355JR structural plates. Guarantees tight diagonal tolerances (±0.5 mm) for clean fitting of box girders and offshore jacket foundation nodes.
Laser Cutting Service Centers
Delivering dead-flat sheets with zero internal stress springback. When fiber laser heads cut intricate contours at high speed, sheets remain flat without tilting upward to collide with the cutting nozzle.
CE Certification & Global Safety Architecture
European CE marking is not merely a label—it requires rigorous conformity with EU harmonized standards. Wuxi Jianfa lines comply fully with the Machinery Directive 2006/42/EC, EMC Directive 2014/30/EU, and Low Voltage Directive 2014/35/EU.
EN ISO 13849-1 (PL e / SIL 3)
Emergency stop relays, safety light curtains, and interlocked roll gap access gates are wired into dual-channel safety PLCs. Any unexpected loss of circuit integrity triggers an immediate failsafe stop within < 20 ms.
Hydraulic Anti-Drop Cartridge Valves
Upper leveling cassettes and hold-down snubber rolls are equipped with pilot-operated check valves and mechanical locking pins, preventing gravity drop during maintenance or power loss.
EN 60204-1 Electrical Compliance
IP54-rated electrical cabinets, comprehensive cable segregation (shielding servo lines from high-voltage motor feeds), Rittal thermal exchangers, and Schneider / Siemens certified switchgear.
Technology Roadmap: AI Adaptive Straightening & Smart Diagnostics
The future of coil leveling lies in eliminating reliance on operator intuition. Jianfa's R&D team is deploying Industry 4.0 data frameworks that automatically correct strip shape deviations in real time.
Laser In-Line Flatness Scanning
Multi-beam optical triangulation units situated post-leveler scan the running sheet at 200 Hz. Center wave or edge wave height profiles are streamed straight to the leveling controller for automatic wedge adjustment.
Edge Computing & Neural Recipe Generation
Upon inputting coil batch metallurgical data (carbon equivalent, measured yield strength, gauge deviation), our machine learning model determines optimal roll entry intermesh and crown curvature without trial-and-error scrap.
Predictive Bearing Vibration Telemetry
Wireless tri-axial accelerometers installed on all main roll support journals detect early bearing race spalling and lubrication degradation, sending warning flags to maintenance managers weeks before catastrophic downtime.
Frequently Asked Questions: Procurement & Technical Specs
Direct engineering responses addressing coil yield limits, machine sizing calculations, CE documentation, and factory inspection protocols.
What is the fundamental difference between a 4-Hi and a 6-Hi leveler for mid-thickness plates?
A 4-Hi leveler consists of working rolls backed directly by backup bearings, ideal for hot-rolled carbon steel where minor surface contact marks are acceptable. A 6-Hi leveler introduces intermediate rolls between the work rolls and backup rolls, which prevents backup roll indentations from transferring to surface-critical stainless steel, automotive, or aluminum sheets while offering superior motorized crown flexing.
How does roll diameter affect plate thickness capacity?
The fundamental rule of leveler physics states that smaller roll diameters achieve tighter bending radii and level thinner gauges, whereas larger roll diameters withstand the extreme bending moments required for thick plates. For mid-thickness ranges (4mm to 16mm), work roll diameters typically range from 110mm to 180mm with optimized roll pitch spacing.
What specific CE documentation does Jianfa provide with machinery shipments?
Every export line arrives with an official EU Declaration of Conformity (DoC), an exhaustive Technical Construction File (TCF), third-party Notified Body certificates, risk assessment registers (EN ISO 12100), hydraulic circuit diagrams with safety SIL/PL validation, and translated electrical schematics adhering strictly to EN 60204-1.
Can Jianfa lines handle high-strength steel coils up to 960 MPa yield strength?
Yes. Straightening high-strength steels like Q690, Weldox, or Hardox requires heavier machine frames, larger gear reducers, forged 42CrMo rolls, and increased hydraulic clamping forces. We engineer specialized heavy-duty cassettes specifically rated for high-yield applications.
What commissioning and operator training are included for international deliveries?
Jianfa dispatches a multidisciplinary team of mechanical, hydraulic, and electrical engineers to oversee foundation anchoring, line alignment, dry runs, and trial coil leveling at your site. We conduct comprehensive operator training covering recipe setup, safety procedures, and regular maintenance.
How can an international buyer verify equipment performance prior to final payment?
We conduct a formal Factory Acceptance Test (FAT) at our 40,000 m² Wuxi facility before shipping. International clients or designated third-party inspection firms (e.g., SGS, TÜV, Bureau Veritas) inspect weldments, verify dimensional tolerances, and run actual test coils on the assembled line.
Explore Our Full Range of Coil Processing Lines
Precision-machined at our Wuxi facility. From individual high-strength levelers to continuous flying shear cut-to-length and slitting lines.
High Strength Leveling Machine
Heavy duty structural frame designed for extreme plastic deformation of thick high-yield plate coils.
Explore Equipment
Professional Straightening Machine
Precision straightening machine engineered to prepare stress-relieved sheets for laser cutting tables.
Explore Equipment
Hot Rolled Plate Moving Shear Line
High-speed traveling shear carriage cuts plate up to 16mm while strip runs continuously at line speed.
Explore Equipment
Stainless Steel Coil Uncoiling-Leveling-Shearing-Stacking Line
Surface-critical processing system with motorized vacuum and pneumatic drop stacking technology.
Explore Equipment
Hot-Rolled Coil Uncoiling-Slitting-Leveling-Cut-To-Length-Stacking Production Line
Consolidated footprint line offering slitting and cut-to-length operations within a single bay setup.
Explore Equipment
Hot Rolled Sheet Uncoiling, Slitting and Recoiling Production Line
Heavy duty slitter head with hydraulic quick tooling change carts and dual-tension recoiling reels.
Explore Equipment
HR Uncoiling-Slitting-Recoiling Line
Engineered for pipe mill supply and structural C-channel forming lines with tight camber tolerances.
Explore Equipment
Hot Rolled Sheet Uncoiling-Leveling-Shearing-Stacking Production Line
Continuous automated workflow: uncoiling, rough flattening, precision leveling, shearing, and auto stacking.
Explore EquipmentRequest Technical Proposal & Factory-Direct Quote
Consult directly with Jianfa's metallurgical machinery design team in Wuxi. Provide your steel coil parameters (thickness, width, yield strength, target tonnage) and receive an engineering proposal within 24 hours.
Schedule an On-Site Factory Visit
Our factory is located a 35-minute high-speed train ride from Shanghai. We welcome overseas purchasing delegations for live machinery demonstrations and technical specification alignment.
Request Technical Catalog Contact Application Engineers