Tension Leveler for Steel Coil
The tension leveler (tension‑bending straightener) is core processing equipment for continuous strip processing lines. By combining strip tension with repeated alternating bending deformation, it eliminates complex 3D flatness defects of metal coils, homogenizes internal residual stress, optimizes strip flatness and mechanical properties. It is widely integrated into hot‑dip galvanizing, continuous annealing, color coating and tinning production lines for carbon steel, stainless steel and titanium alloy strips.
1.Working Principle
The tension leveler adopts double‑bending & double‑straightening single‑drive mechanical architecture.
Tension stabilization: Inlet and outlet tension rolls build stable strip tension and minimize tension fluctuation; tension is further amplified through the roll cluster.
Alternating bending deformation: Two groups of upper and lower bending assemblies generate repeated positive‑negative bending on the travelling strip. Residual stress across strip width is evenly redistributed to eliminate local uneven longitudinal elongation, the root cause of flatness defects.
Final leveling correction: Follow‑up leveling roll sets perform final shape calibration. The strip’s internal stress field becomes uniform, realizing stable target flatness and improved material formability.
Tension Leveler for Steel Coil removes typical strip flatness defects: unilateral wave, bilateral wave, center wave, two‑edge rib wave, camber, buckling and latent shape imperfections. Such defects originate from improper roll contour and roll‑gap deviation during preceding rolling, bringing uneven width‑wise longitudinal extension and disordered rolling stress to coiled strips. Tension leveling is the essential process to fix these issues before downstream processing.
2.Core Technical Specifications
| Item | Parameter |
| Strip material | Soft or semi-soft carbon steel, cold-rolled carbon steel, stainless steel, Titanium, etc. |
| Strip thickness | 0.15-6.0 mm |
| Strip width | 650-1880 mm |
| Strip running speed | ≤750 m/min |
| Incoming strip flatness | ≤30-50I |
| Finished strip flatness | 3-5I |
| Optional accessory | Hydraulic roll changing device |
3.Main Mechanical Bill of Material
| No. | Component Name | Qty |
| 1 | Machine Frame | 1 set |
| 2 | Φ30 Bottom Bending Roll Units | 2 sets |
| 3 | Φ30 Top Bending Roll Units | 2 sets |
| 4 | Locking Device | 2 sets |
| 5 | Φ200 Top Straightening Roll Units | 4 sets |
| 6 | Bottom Lifting Device | 1 set |
| 7 | Φ50 Anti horizontal Bending Roll Units | 1 set |
| 8 | Φ70 Anti vertical Bending Roll Units | 1 set |
| 9 | Roll change Device | 1 set |
4.Supply Scope
- Mechanical parts: Main machine of double‑bending double‑straightening Tension Leveler for Steel Coil + roll‑change device (anchor bolts, valve stand and guide rails excluded)
- Electrical parts: On‑host wiring terminating at main machine junction box
- Hydraulic parts: Only hydraulic piping supplied; transmission‑side connection interfaces reserved for customer’s external hydraulic station
Packaging: Main unit vacuum‑packed and packed into seaworthy wooden crates for export shipment.
5.Industrial Application Scenarios of Tension Leveler for Steel Coil
- Iron & Steel Metallurgy Lines
It is an indispensable station for CGL continuous hot‑dip galvanizing line, CAL continuous annealing line, TTL tension leveling & recoiling line, CCL color‑coating line and tinning line.
For carbon‑steel hot‑dip galvanizing lines in particular: tension leveler eliminates yield‑point elongation of incoming strip. Before the strip enters the zinc pot, excellent flatness and surface condition are obtained. Uniform zinc coating without defects can be achieved, which directly determines final product corrosion resistance, stamping formability and commercial value for automotive and construction steel grades.
- Rail Transit Industry
Supplies high‑flatness sheet blanks for high‑speed railway, metro, tram and comprehensive airport transport infrastructure projects.
- Automotive Manufacturing
Processes strip blanks for car body panels, vehicle doors, roof panels and other stamping components, avoiding stamping cracking and surface ripple caused by residual internal stress.
- Home Appliance & Consumer Hardware
Provides qualified leveled metal sheets for televisions, refrigerators, air‑conditioners and household hardware production.
Conclusion
For modern continuous metal strip processing, tension levelers are not only shape‑correcting machines, but also stress‑homogenizing process units. With working speed up to 750 m/min, processing width 650‑1880 mm and thickness 0.15‑6.0 mm, it downgrades incoming flatness ≤30‑50I down to finished 3‑5I, delivering high‑quality strip feed stock for galvanizing, coating and stamping industries.
- Topics You may Be Interested In:
- Tension Leveler
- Work Roll
- Side trimmer
- Multi-roll Leveler
- Roll coater