4-Hi 650mm CRM

1. Equipment Overview
This is a 4-Hi 650mm reversible cold rolling mill, manufactured by Wuxi Wuye in 2016 and still in normal operation (scheduled for shutdown on September 15, 2026). This is a professional-grade stainless steel cold rolling mill, specifically designed for precision cold rolling of SUS 201 stainless steel strip, also applicable to other stainless steel series and high-quality carbon steels.

2. Manufacturer Background
Wuxi Wuye is a well-known metallurgical equipment manufacturer in China, with deep technical expertise in cold rolling mills, hot rolling mills, pickling lines, slitting lines, and related equipment. The Wuyi brand enjoys high market recognition in the stainless steel cold rolling equipment sector, with products known for high precision, good rigidity, and strong durability.

3. Core Highlight — Equipment in Active Service
The most notable highlight of this equipment is that it is still in normal operation (scheduled for shutdown on September 15, 2026). This means:

• The equipment is not long-idle or scrapped, but continuously operating in production;

• All functional components are in good working condition, with no"idling diseases"such as rust, seal aging, or lubricant dry-out caused by prolonged idling;

• Buyers can arrange on-site trial runs with actual materials before dismantling, directly verifying core performance indicators such as rolling precision, thickness tolerance, and shape quality;

• The equipment's operating history and maintenance records are traceable, with exceptionally high equipment condition transparency.

4. Main Motor System — Dual Motor Drive
The mill is equipped with 2 main motors, each rated at 500kW, for a combined total of 1000kW. Dual motor drive is the typical configuration for reversible cold rolling mills—during the reversing rolling process, the strip passes through the mill in multiple passes, with the coiler and uncoiler swapping roles after each pass, requiring two independent drive systems to control the coiling/uncoiling operations on both sides. The symmetrical configuration of 2 x 500kW motors ensures balanced power delivery in both rolling directions.

5. Recoiler and Uncoiler

• Recoiler motor: Power rating 450kW, which performs dual roles of both recoiling and uncoiling in reversible rolling operations;

• The uncoiler and recoiler share the motor system, with function switching achieved through clutches and reversing mechanisms.

6. Mill Type — 4-Hi Four-High Mill
This equipment is a 4-Hi (four-high) cold rolling mill, consisting of 2 small-diameter work rolls and 2 large-diameter backup rolls. The 4-Hi configuration is the standard for cold rolling of stainless steel:

• Work rolls: Directly contact the strip and provide rolling deformation; smaller diameters help reduce rolling force and achieve thinner gauges;

• Backup rolls: Provide rigid support to the work rolls, reducing work roll bending deflection and ensuring shape and thickness accuracy.

7. Designed Rolling Parameters

• Designed rolling material: SUS 201 stainless steel. SUS 201 is a typical austenitic stainless steel with a high work-hardening rate, imposing high requirements on mill rigidity and rolling force. This equipment is specifically designed for the rolling characteristics of 201 stainless steel, maintaining stable rolling precision under high deformation resistance and rapid work-hardening conditions.

• Maximum designed input thickness (entry): 3.0mm;

• Minimum designed finished thickness (exit): 0.2mm;

• Maximum designed rolling width: 580mm;

• Actual maximum rolling width used by the original owner: 580mm — actual performance matches design, equipment capability fully verified;

• Maximum rolling speed: 240m/min.

8. Spare Parts
This equipment comes with extensive spare parts, including 50 work rolls (WR), 4 backup rolls (BUR), and 20 solid drums. Work rolls are the most consumable spare part in cold rolling mills, requiring frequent replacement due to surface wear and regrinding; backup rolls have high individual value and long manufacturing lead times; the drum is the core component of the coiler, withstanding enormous coiling tension and impact loads. This ample spare parts inventory effectively ensures sustained stable production after the buyer's commissioning, significantly reducing downtime caused by parts shortages.

9. Electrical Control System
According to the technical data sheet, the electrical control system is in good condition (Yes) with no missing components. This means the mill's automation control system, drive control system, PLC, sensors, and associated equipment are all complete and functional, requiring no additional investment from the buyer for electrical system repair or replacement.

10. Equipment Status and Services
The technical data sheet clearly records:

• Equipment still in operation (planned shutdown September 15, 2026) — on-site trial runs available;

• Electrical control system intact, no missing components;

• Disassembly services available (Yes);

• Equipment refurbishment and maintenance services available (Yes);

• Spare parts list provided (50 WR + 4 BUR + 20 solid drums).

11. Procurement Value Summary
For enterprises specializing in stainless steel cold rolling, or investors planning to enter the stainless steel precision strip market, this equipment offers the following core procurement values:

• Professional-grade configuration: Specifically designed for SUS 201 stainless steel with mature process parameters;

• In-service status: Equipment is running, with transparent condition and verifiable performance;

• Moderate age: Manufactured in 2016, approximately 10 years old, still in the golden phase of equipment lifecycle;

• Ample spare parts: 50 work rolls + 4 backup rolls + 20 solid drums;

• Flexibility advantage: Single-stand reversible type, suitable for multi-specification, small-batch, high-precision orders;

• Speed performance: The maximum rolling speed of 240m/min is in the upper-medium range among comparable reversible mills, balancing production efficiency and rolling precision.

12. Conclusion
In summary, this 4-Hi 650mm reversible cold rolling mill is a professional-grade stainless steel cold rolling equipment, still in operation with transparent condition, ample spare parts, moderate age, and complete specifications, representing a core second-hand cold rolling asset. Its SUS 201 stainless steel-specific process characteristics and high flexibility of single-stand reversible rolling make it a high-value strategic asset in the stainless steel precision strip processing sector. For companies pursuing"professional-grade stainless steel cold rolling capability at a moderate investment,"this represents an excellent opportunity worthy of serious consideration.