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700mm HRM

used 700mm
This production line is a 700mm fully continuous hot-rolling narrow strip steel line with an annual capacity of 1.5 million tons. Using continuous casting slabs as raw material, it produces high-quality carbon structural steel and low-alloy steel strip coils with a thickness of 1.0-7.0mm and a width of 315-520mm through processes including heating, high-pressure water descaling, roughing rolling, finishing rolling, cooling, and coiling. The line incorporates advanced technologies such as a fully continuous layout, off-head rolling between roughing and finishing mills, hydraulic AGC for automatic gauge control, AWC+SSC for width control, and low-inertia loopers for constant tension control, ensuring high precision and quality of the final produc
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1. Production Scale and Products

  • Annual Production Capacity: 1.5 million tons of strip steel coils.

  • Product Specifications:

    • Thickness: 1.0 - 7.0 mm

    • Width: 315 - 520 mm

    • Max Coil Weight: 6 tons

    • Max Coil Outer Diameter: Φ1600 mm

    • Steel Grades: Ordinary carbon steel, high-quality carbon structural steel, low-alloy steel, etc.

    • Product Standards: Complies with various Chinese national standards (GB) for hot-rolled strip, including GB/T8164, GB709, and GB710.

2. Raw Materials

  • Raw Material Type: 100% Continuous casting slabs.

  • Billet Specifications:

    • Thickness: 150 mm

    • Width: 330 - 520 mm

    • Length: 9000 - 10000 mm

    • Max Weight: 6 tons

3. Main Process Flow

  • Slab Heating: Slabs are heated to approximately 1250°C in a walking beam furnace.

  • Descaling: A high-pressure water descaling unit removes the primary oxide scale from the heated slab surface.

  • Roughing Rolling: The scaled slab is rolled in an 8-stand roughing mill (arrangement: 1 Vertical, 2 Horizontal, 1 Vertical, 2 Horizontal, 1 Vertical, 1 Horizontal) into an intermediate strip with a thickness of 28–35mm.

  • Crop Shearing: A flying shear crops the head of the intermediate strip to facilitate entry into the finishing mill.

  • Finishing Rolling: The intermediate strip is rolled to the final thickness in a 10-stand finishing mill (1 Vertical, 9 Horizontal). A secondary descaling unit is located after the first finishing stand (E4) to remove secondary scale.

  • Cooling and Coiling: The finished strip is cooled on a flat chain conveyor and then coiled by a vertical, shrink-core-type coiler. The coils are then transferred to a conveyor chain for final handling and storage.

4. Core Technical Features

  • Fully Continuous Layout: Features a continuous setup with"off-head"rolling between the roughing and finishing mills for high production efficiency.

  • High-Precision Control Systems:

    • Gauge Control: All F1-F9 finishing stands are equipped with hydraulic AGC (Automatic Gauge Control) for precise thickness control.

    • Width Control: The E1-E4 vertical edgers utilize hydraulic AWC (Automatic Width Control) and SSC (Short Stroke Control) for superior width accuracy.

    • Tension Control: Eight low-inertia electric loopers between the finishing stands ensure constant micro-tension rolling for improved shape and dimensional stability.

  • Advanced Instrumentation: The line is equipped with imported thickness gauges and width gauges after the finishing mill for real-time monitoring and control of product quality.

  • Temperature Management: Insulation covers between the roughing and finishing mills minimize temperature loss of the intermediate strip. The final rolling temperature is controlled between 850°C and 950°C.

  • Efficient Coiling: A robust vertical, shrink-core-type coiler handles strip at speeds up to 15 m/s, with a maximum coil weight of 6 tons.

  • Drive and Lubrication: Main mill stands are driven by DC motors. The roll systems and bearings use advanced oil-air lubrication for reliability and longevity.

5. Main Equipment Composition

  • Roughing Mill Unit:

    • E1-E3 Vertical Edgers: Hydraulic AWC+SSC control. Roll size: Φ650/600x400mm.

    • R1-R5 Two-High Horizontal Mills: Hydraulic APC (Automatic Position Control) screw-down. Roll size: Φ690/630x670mm.

  • Finishing Mill Unit:

    • E4 Vertical Edger: Hydraulic AWC+SSC control. Roll size: Φ600/550x200mm.

    • F1-F2 Two-High Mills: Hydraulic AGC. Work Roll size: Φ660/610x670mm.

    • F3-F9 Four-High Mills: Hydraulic AGC. Work Roll size: Φ360/400x700mm; Backup Roll size: Φ660/610x670mm.

  • Shearing Equipment:

    • Rotary Drum Flying Shear: Located before the finishing mill for head cropping. Max shear force: 2500 KN.

  • Coiling Equipment:

    • Vertical Colier: Shrink-core type with a φ520/500mm core.