20-Hi Cold Rolling Mills: The Pinnacle of Precision in Metal Processing
By HANI TECH – Your Trusted Partner in Advanced Metallurgical Equipment
The global demand for ultra-thin, high-precision metal strips has surged across industries like artificial intelligence, renewable energy, and aerospace. To meet these stringent requirements, 20-Hi cold rolling mills have emerged as the gold standard, offering unparalleled control over thickness, surface quality, and mechanical properties. HANI TECH, a leader in metallurgical equipment manufacturing, specializes in designing and delivering cutting-edge 20-Hi rolling solutions tailored to diverse industrial needs.
Why 20-Hi Cold Rolling Mills?
Unlike traditional 4-Hi or 6-Hi mills, the 20-Hi configuration employs a multi-layer roll stack (typically 20 rolls arranged in a compact, interlocking design) to achieve:
- Ultra-thin rolling capabilities: Thicknesses as low as 0.01mm for stainless steel and other high-performance alloys.
- Superior surface finish: Minimized roll marks and defects, critical for electronics and medical applications.
- Enhanced thickness precision: Rigidity up to 4,900 kN/mm, ensuring consistent gauge control.
- Reduced power consumption: Optimized roll contact reduces energy use by up to 30% compared to conventional mills.
HANI TECH’s 20-Hi mills integrate these advantages with proprietary innovations, making them ideal for carbon steel, stainless steel, silicon steel, and titanium alloy production.
Key Specifications of HANI TECH’s 20-Hi Cold Rolling Mills
Below is a detailed comparison of HANI TECH’s flagship models, showcasing their versatility across industries:
| Specification | 850mm 20-Hi Mill | 1450mm 20-Hi Mill | Narrow-Width 280mm Mill |
|---|---|---|---|
| Material Types | Carbon steel, 300/400 series stainless steel | Alloy steels, electrical steels, titanium | High-precision copper, aluminum foils |
| Max. Rolling Pressure | 9,000 kN | 12,000 kN | 5,000 kN |
| Max. Rolling Speed | 500 m/min | 600 m/min | 300 m/min |
| Work Roll Diameter | Φ63.5 mm (Cr12Mo1V1) | Φ75 mm (High-speed steel) | Φ40 mm (Tungsten carbide) |
| Thickness Range | 0.03–3.0 mm | 0.05–4.0 mm | 0.01–1.0 mm |
| Width Range | 600–850 mm | 1,000–1,450 mm | 100–300 mm |
| Coiling Tension | Up to 400 kN | Up to 600 kN | Up to 150 kN |
| Applications | Automotive panels, battery foils | Transformers, aerospace components | Semiconductor substrates, flexible electronics |
HANI TECH’s Technological Edge
- Integrated Roll System Design
- HANI TECH’s 20-Hi mills feature a pre-stressed arch frame with circular-arc tracks for backup rolls, ensuring stability even at high speeds.
- Suspension hydraulic cylinders adjust intermediate rolls dynamically, reducing vibration and improving strip flatness.
- Precision Control Systems
- Advanced AGC (Automatic Gauge Control) and AFC (Automatic Flatness Control) systems achieve ±1μm thickness tolerance and eliminate edge wave defects.
- Real-time monitoring via HANI TECH’s proprietary SmartMill® software optimizes rolling parameters for minimal downtime.
- Customization for Niche Markets
- For titanium alloy producers, HANI TECH offers corrosion-resistant roll materials and lubrication systems to prevent surface contamination.
- Narrow-width mills incorporate ultra-hard work rolls (e.g., tungsten carbide) for micro-thin foil production.
Case Study: Breaking China’s Ultra-Thin Strip Barrier
HANI TECH partnered with Sino-Heavymach to develop a 1450mm 20-Hi mill capable of rolling 0.01mm stainless steel, a feat previously dominated by European suppliers. Key innovations included:
- A unified plastic deformation model for extreme-thin strips, improving thickness control by 40%.
- One-side residual oil control technology, meeting semiconductor-grade surface cleanliness standards.
- 200,000-cycle bending fatigue resistance for critical roll components, slashing maintenance costs.
This mill now supplies Ningbo Baoxin Stainless Steel and Yunnan Titanium Industry, reducing China’s reliance on imported ultra-thin materials.
Why Choose HANI TECH?
- Global Track Record: Over 50 installed 20-Hi mills worldwide, including projects for Taiyuan University of Technology and Hunan Rare Earth Metal Materials Research Institute.
- End-to-End Solutions: From roll design to turnkey plant construction, HANI TECH handles every stage of your project.
- Sustainability Focus: Energy-efficient drives and recyclable roll materials align with global decarbonization goals.
Conclusion
HANI TECH’s 20-Hi cold rolling mills represent the fusion of precision engineering and industrial innovation. Whether you’re producing battery foils for EVs or aerospace-grade titanium, our solutions deliver unmatched quality, efficiency, and reliability.
Ready to elevate your metal processing capabilities?
Contact HANI TECH today for a customized consultation and join the ranks of industry leaders transforming the future of manufacturing.
