980mm cold rolling mill

1. Equipment Overview
This is a 980mm reversible cold rolling mill, manufactured by Wuxi Jinjie in September 2015 and taken offline on August 5, 2026. The technical data sheet does not directly specify the number of rolls, but based on the configuration of work roll specifications (Ф180×1050mm) and backup roll specifications (Ф820×980mm)  This is a professional-grade wide-width stainless steel cold rolling mill, specifically designed for high-precision cold rolling of stainless steel strips. The 980mm width specification places it in the medium-to-wide category for stainless steel cold rolling, suitable for precision rolling of various stainless steel series including SUS 201, SUS 304, and SUS 430.

2. Manufacturer Background
Wuxi Jinjie is a well-known enterprise in China's metallurgical equipment manufacturing sector, with deep technical expertise and extensive engineering experience in the R&D and production of stainless steel cold rolling mills, reversible mills, temper mills, and related equipment. The Jinjie brand enjoys high market recognition in the stainless steel processing industry, with products known for high precision, good rigidity, and stable operation.

3. Core Highlight — Equipment Condition and Age Advantage
This equipment was manufactured in September 2015 and taken offline on August 5, 2026, with approximately 11 years of actual service. In cold rolling equipment, 11 years represents the mid-life phase of the equipment lifecycle, far superior to commonly available second-hand equipment with 15-25 years of service age. This means:

• Main structures (housings, roll bearing chocks, gearboxes, etc.) have controlled wear levels with long remaining service life;

• Electrical systems (DC motors, thyristor rectifiers, PLC control systems, etc.) remain in good operating condition;

• The equipment can continue service for 10-15+ years;

• The equipment was in operation until shutdown, with no issues such as rust or seal aging caused by long-term idling.

4. Main Motor System — Dual Motor High-Power Drive
The mill is equipped with 2 main motors, model Z4-560-4A, each rated at 750kW, with a rated voltage of 440V and a speed range of 413-1200 rpm, for a combined total of 1500kW. Dual motor drive is the standard configuration for reversible 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 750kW motors ensures balanced power delivery in both rolling directions, with ample single-motor power to handle the high deformation resistance of stainless steel.

5. Recoiler and Uncoiler Systems
The recoiler and uncoiler are each equipped with 2 Z4-560-4A motors, each rated at 750kW, identical to the main motor model. The recoiler/uncoiler motors using the same power configuration as the main motors reflects the"front-rear symmetrical"design philosophy of this reversible mill—regardless of which direction the strip moves, the motors on the drive side provide the same power and tension control capability. The coiling method adopts a solid drum with specifications of Ф500×1100mm, offering simple and reliable construction with strong load capacity, suitable for the high-tension coiling requirements of stainless steel strips.

6. Roll Systems

• Work Roll: Specification Ф180×1050mm, with a roll diameter of 180mm and barrel length of 1050mm. The small-diameter work rolls help reduce rolling force, enable rolling of thinner gauges, and ensure strip surface quality;

• Backup Roll: Specification Ф820×980mm—the large-diameter backup rolls provide robust support to the work rolls, reducing work roll bending deflection under immense rolling forces, ensuring shape precision and thickness consistency;

• Housing: Specification Ф450×550mm—the housing is the core load-bearing structural component of the mill; its cross-section dimensions reflect the equipment's structural strength and rigidity level.

7. Designed Rolling Parameters

• Designed rolling material: SS (Stainless Steel) , covering common stainless steel series including SUS 201, SUS 304, and SUS 430;

• Maximum designed input thickness (entry): 5.0mm—for stainless steel, a 5.0mm entry thickness represents a relatively thick raw material specification, imposing high requirements on mill rigidity and rolling force;

• Minimum designed finished thickness (exit): 0.2mm—rolling from 5.0mm to 0.2mm represents a total reduction of 96%, fully demonstrating the equipment's powerful cumulative deformation capability and high-precision control level;

• Maximum designed rolling width: 900mm—with work roll barrel length of 1050mm, the effective rolling width of 900mm leaves sufficient margin;

• Actual maximum rolling width used by the original owner: 900mm—consistent with design;

• Actual maximum input thickness used by the original owner: 5.0mm—consistent with design;

• Actual minimum finished thickness used by the original owner: 0.2mm—consistent with design;

• Maximum rolling speed: 250m/min;

• Maximum rolling force: 1400 tons (approximately 13720kN).

8. Maximum Rolling Force — 1400 Tons of Power
The 1400-ton maximum rolling force is one of the most important performance indicators of this equipment. Stainless steel (particularly austenitic stainless steels such as SUS 201 and SUS 304) has a high work-hardening rate and deformation resistance, requiring far greater rolling force than ordinary low-carbon steel to achieve effective thickness reduction. The 1400-ton rolling force configuration ensures that the equipment maintains sufficient deformation capability when rolling thick stainless steel materials (5.0mm entry) and high-strength grades, sustaining stable rolling force output across all passes to guarantee finished thickness accuracy and shape quality.

9. Equipment Large-Scale Characteristics
This equipment is a large-scale cold rolling asset, with key parameters demonstrating its wide-width, high-power, high-rolling-force characteristics: maximum width 900mm, main motor 1500kW, recoiler/uncoiler motors 1500kW, rolling force 1400 tons, entry thickness 5.0mm. These parameters make it highly competitive in stainless steel medium-to-heavy plate and thin strip rolling.

10. Electrical Control System — Siemens Brand Guarantee
The mill's electrical control system is supplied by Siemens, a globally leading brand in industrial automation and drive control, with world-class technology in metallurgical rolling control. Siemens electrical control systems are known for their stability, reliability, high control precision, strong anti-interference capability, and comprehensive maintenance service networks. According to the technical data sheet, the electrical control system is in good condition (Yes) with no missing components—meaning 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.