Model & Type: 4-Hi Cold Rolling Mill (850CRM), tailored for high-efficiency cold rolling of multi-series metal strips.
Operational History: Manufactured in 2012., with a transparent service record until its decommissioning in 2025. The shutdown was purely due to equipment replacement (not performance issues), confirming it as a well-maintained used asset with no hidden operational defects.
Supplier Assurance: Provided and backed by Keepwin Industry Co., Limited—a professional used metallurgical total solution provider. This ensures strict quality verification of the equipment and reliable post-sales support, including potential disassembly, refurbishment, and maintenance services.
Exceptional Rolling Versatility & Capacity: Designed to process 200, 300, and 400 series materials, with a maximum designed rolling width of 810mm (for 304 material) and 780mm (for 201 material)—consistent with the original owner’s actual maximum rolling width of 810mm. It handles entry material up to 2.5mm thick (matching the original user’s actual feed thickness) and can roll down to a minimum finished thickness of 0.2mm (original user achieved 0.25mm), making it ideal for diverse thin-strip production needs.
High-Power & Stable Drive System: Equipped with two Z560-4A main motors (750kW each) with a rotating speed range of 413-1200rpm, plus two identical Z560-4A coiler/uncoiler motors (750kW each). This dual-motor configuration delivers strong and balanced power output, ensuring smooth, continuous, and efficient rolling operations even under high-load conditions.
Precision Thickness Control: Features an advanced AGC (Automatic Gauge Control) screw-down system—far superior to basic electric screw-down systems. This technology enables real-time, accurate adjustment of rolling gaps, guaranteeing exceptional thickness uniformity of the finished strip and meeting high-precision production requirements.
Robust & Stable Mechanical Structure: Adopts a 4-Hi configuration, supported by a heavy-duty mill housing with a 480×560mm cross-section. This structure effectively minimizes roll deflection during high-force rolling (max. rolling force of 1200 tons), ensuring long-term operational stability, reducing strip shape defects, and maintaining consistent product quality.
Work Rolls: Ø165×850mm, the core component directly in contact with the material for deformation. Their compact size and precise dimensions enable efficient pressure transmission, ensuring fine control over the strip’s thickness and surface quality.
Backup Rolls: Ø750×830mm (with a designed width of 850mm), providing robust rigid support to the work rolls. Their large diameter and high rigidity distribute rolling forces evenly across the roll stack, preventing excessive work roll bending and laying the foundation for stable operation under maximum rolling force.
Verified System Integrity: The electrical control system—manufactured by Siemens (a globally recognized brand)—is confirmed to be fully intact and in good working condition. This eliminates the need for costly electrical system overhauls, reduces the risk of delays during commissioning, and lowers the buyer’s initial investment in restoration.
Abundant Inclusive Spare Parts: Beyond the original equipment components, the package includes a generous set of spare parts: 31 solid drums, 7 backup rolls, and 107 work rolls. This inventory directly supports future maintenance needs, shortens repair lead times, and minimizes unexpected production downtime.
Comprehensive Service Support: The seller offers end-to-end professional services, including equipment disassembly, refurbishment, and maintenance (specific costs to be confirmed based on requirements). This “one-stop solution” addresses the typical challenges of used heavy machinery procurement—such as disassembly complexity and post-purchase maintenance—and reduces operational risks for the buyer.
