5-stand 600mm cold tandem rolling mill

1. Equipment Overview
This equipment is a 5-stand 600mm cold tandem rolling mill, manufactured by Wuxi Hongshun in 2020 and taken offline in 2025. This is a highly modernized, extremely recent second-hand cold rolling core asset. Compared to the previously described 6-stand 650mm tandem line, this equipment has one fewer stand and is slightly narrower in width, but features higher individual motor power (750kW vs 630kW), higher total power (3750kW vs 3360kW), and higher rolling speed (380m/min vs 240m/min) , offering significant advantages in high-speed rolling of thin-gauge products.

2. Core Highlight — Ultra-Short Service Life
The most compelling competitive advantage of this equipment is its exceptionally short service life: manufactured in 2020 and taken offline in 2025, with only about 5 years of actual service. In the second-hand heavy metallurgical equipment market, 5-year-old equipment is extremely rare—the vast majority of circulating second-hand cold rolling equipment has service ages of 10–20 years or more. Five years of service意味着:

• Minimal mechanical wear: Critical components such as bearings, gearboxes, housings, and rolls have consumed very little of their fatigue life, approaching new-machine condition;

• Virtually no electrical system aging: Motors, drives, sensors, PLCs, and other electrical components remain in the golden phase of their lifecycle;

• Precision retention close to factory-new levels: Core indicators such as roll gap accuracy, shape control, and thickness tolerances have degraded minimally;

• Extremely long remaining service life: Buyers can expect 15–20 years or more of secondary service life, with extremely low annual depreciation costs;

• Ready for production without major overhaul: Unlike older equipment that often requires comprehensive refurbishment, this equipment can be quickly put into production after basic commissioning.

3. Manufacturer Background
Wuxi Hongshun is a prominent enterprise in China's cold rolling equipment manufacturing sector, specializing in the R&D and production of small-to-medium规格 tandem mills, reversible mills, temper mills, and related equipment. Its products are known for rational design, precision manufacturing, and high cost-effectiveness, with an extensive customer base across East China and nationwide. This 2020-vintage line represents Hongshun's advanced design standards and manufacturing processes of that period.

4. Main Motor System — Total Power 3750kW
Each of the 5 stands is equipped with an independent main drive motor, all of which are Z560-3A DC motors, each with a power rating of 750kW, for a combined total power of 3750kW. Each motor is rated at 515/1200rpm, offering the characteristic advantages of DC drives including high starting torque, wide speed range, and strong overload capacity.

In comparison, the previously described 6-stand 650mm line has a total main motor power of 3360kW (across 6 motors), while this equipment achieves 3750kW with just 5 motors—both individual motor power and total power are higher. This means each stand delivers greater rolling drive force, performing more excellently under high-deformation-resistance materials and high-speed rolling conditions.

5. Uncoiler and Coiler System

• Uncoiler: Equipped with 30kW motors, 2 units, featuring a dual-uncoiler configuration. The dual-uncoiler design enables"one active, one standby"or"quick coil change"operation, significantly reducing downtime for coil changes and improving continuous production efficiency.

• Recoiler: Equipped with Z4-355-32 motors, 315kW each, speed 500/1500rpm, 2 units, featuring a dual-recoiler configuration. The dual-recoiler design allows switching between recoiling stations without stopping the line, enabling continuous recoiling and further enhancing production efficiency.

6. Roll Systems

• Working Roller: Specification Ø170-185×600mm, meaning the roll diameter is replaced when worn from 185mm (new) down to 170mm, with a barrel length of 600mm.

• Backup Roller: Specification Ø530-550×580mm, with a diameter significantly larger than the working rollers, providing robust support to the working rollers and reducing bending deflection during rolling.

7. Screw-Down System — AGC Hydraulic Screw-Down
This mill employs an AGC (Automatic Gauge Control) hydraulic screw-down system, enabling real-time precision adjustment of roll gaps during high-speed rolling, ensuring that thickness tolerances of finished strips are controlled within extremely tight limits across the entire length. AGC is one of the core indicators of a cold rolling mill's technological level—this equipment's AGC system demonstrates its modern cold rolling mill configuration standards.

8. Designed Rolling Parameters

• Designed rolling materials: Q195, Q235 hot-rolled pickled coils. Hot-rolled pickled coils are ideal raw material for cold rolling—pickling removes surface scale, allowing direct cold rolling.

• Maximum designed input thickness (entry): 2.5-3.0mm.

• Minimum designed finished thickness (exit): 0.3mm.

• Maximum designed rolling width: 520mm, with working roll barrel length of 600mm, leaving sufficient margin.

• Designed rolling speed: 380m/min, significantly higher than the 240m/min of the previously described 650mm line, representing a medium-to-high speed configuration for 600mm-class tandem mills, enabling higher shift production output.

9. Maximum Rolling Force
The maximum rolling force is 5000kN (approximately 500 metric tons of force), slightly lower than the 6000kN of the previously described 650mm line. However, for a 600mm rolling width, 5000kN is fully sufficient for the 2.5-3.0mm→0.3mm rolling reduction requirements. Higher rolling force is not always necessary—the key is matching the rolling width and thickness range.

10. Actual Production Parameters from the Original User
According to the technical data sheet records, the original user's actual production parameters are fully consistent with the design parameters:

• Actual maximum rolled width: 520mm

• Actual maximum input thickness: 2.5-3.0mm

• Actual minimum finished thickness: 0.3mm

This confirms that the equipment has fully realized its design capability in actual production, with all design targets verified under real working conditions.

11. Electrical Control System
The mill's electrical control system is supplied by BEIZHENG, a well-known Chinese provider of metallurgical drive and automation control systems, with extensive engineering application experience in cold rolling, hot rolling, pickling, and other metallurgical fields. Beizheng's electrical control systems are known for high cost-effectiveness, good adaptability, and timely after-sales service. According to the technical data sheet, the electrical control system is in good condition (Yes) with no missing components.

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

• Electrical control system intact, no missing components;

• Disassembly services available (Yes);

• Equipment refurbishment and maintenance services available (Yes);

• Spare parts list available upon request (Yes, details to be confirmed).

13. Core Differences and Complementary Positioning vs. the 6-Stand 650mm Line

Key Difference Interpretation:

• Although this equipment is slightly narrower in width (520mm vs 550mm), has one fewer stand (5 vs 6), and slightly lower rolling force (5000kN vs 6000kN), its higher total main motor power, higher individual motor power, and higher rolling speed mean that when processing thin-gauge products (such as 0.3mm and below), this equipment's production efficiency is significantly higher than the 650mm line;

• 2020 manufacturing + 2025 shutdown with only 5 years of service is this equipment's biggest trump card—a"disruptive"presence in the second-hand cold rolling equipment market;

• The dual-uncoiler + dual-recoiler configuration gives this equipment an advantage in continuous production efficiency over single-uncoiler/single-recoiler configurations.

14. Application Scenarios and Downstream Uses
The 0.3mm thin strip produced by this equipment can be widely used in:

• Cold-rolled strip: As base material for galvanizing, prepainting, and annealing processes;

• Tube manufacturing: Blank material for high-frequency welded pipes and precision tubes;

• Stamping industry: Stamping raw materials for automotive components, home appliance panels, and hardware parts;

• Packaging materials: Thin-gauge packaging steel strips;

• Electrical products: Motor housings, transformer strip, etc.

15. Scarcity and Strategic Value in the Second-Hand Market
In the second-hand cold rolling equipment market, a 5-year-old, recently shut down, fully intact 5-stand tandem mill is practically a"rare gem."The vast majority of circulating equipment faces high refurbishment costs, lengthy retrofitting cycles, and unpredictable hidden failure risks. With this equipment's extremely short service life, many key components remain near-new, allowing buyers to:

• Significantly shorten time-to-production: Ready for fast commissioning after basic setup, without lengthy overhauls and retrofits;

• Substantially reduce refurbishment costs: No need for large-scale component replacement as required for 15–20-year-old equipment;

• Enjoy near-new performance: Precision, efficiency, and stability far exceed the average level of second-hand equipment on the market.

16. Equipment Dimensions and Weight Estimate (Based on Industry Experience)
Although the technical data sheet does not separately list dimensions and total weight for each component, based on industry standard design references for 600mm-class 5-stand tandem mills, a reference range can be provided:

• Total equipment weight: Typically in the 250–400 ton range, depending on base thickness, housing dimensions, motor specifications, and auxiliary equipment configuration;

• Single stand housing weight: Approximately 20–30 tons per housing, totaling 100–150 tons for 5 stands;

• Total main motor weight: Approximately 40–60 tons for 5 Z560-3A 750kW DC motors combined;

• Dual recoilers + dual uncoilers: Approximately 25–35 tons;

• Rolls (including working and backup rolls, with spares): Approximately 15–25 tons;

• Structural components (bases, rails, platforms, etc.): Approximately 60–100 tons.

The above are estimates; actual weights should be based on the physical equipment or detailed lists provided by the seller.

17. Conclusion
In summary, this 5-stand 600mm cold tandem rolling mill is an extremely recent (2020), ultra-short-serviced (only 5 years), high-total-power (3750kW), high-speed (380m/min), dual-uncoiler/dual-recoiler-equipped, AGC-fitted second-hand cold rolling"near-new"machine. Its ultra-short service life gives it an overwhelming competitive advantage in the second-hand market—essentially getting near-new performance and remaining life at a second-hand price. For companies looking to establish or upgrade cold-rolled strip production capacity with a moderate investment, this represents an extraordinarily rare and unmissable strategic opportunity.