This 1450mm continuous hot-dip galvalume line represents a complete, modern, and high-capacity solution for the production of high-quality aluminum-zinc alloy coated steel strips. Designed with an annual production capacity of 150,000 tons, this line integrates advanced metallurgical processes, precision mechanical equipment, and reliable automation to deliver superior finished products. The line is engineered to process cold-rolled hard coils through a continuous sequence of cleaning, annealing, coating, and post-treatment, resulting in galvalume steel strips with excellent corrosion resistance, surface quality, and mechanical properties.
The equipment is supplied by Keepwin Industry, a professional used metallurgical solution provider, ensuring comprehensive technical support, disassembly services, and installation assistance for a seamless transition to full production.
The line adopts the internationally recognized US Steel (USS) production process, which is widely used for high-quality continuous galvanizing and galvaluming. This process ensures excellent coating adhesion and uniform surface quality.
The complete production sequence includes:
Entry Section: Two uncoilers allow for continuous operation through coil joining.
Welding: A narrow lap automatic welder joins coil ends for uninterrupted processing.
Entry Looper: A 300-meter horizontal looper maintains process section continuity during entry coil changes.
Electrolytic Cleaning: Removes oil and surface contaminants to ensure a pristine substrate for coating.
Reduction Annealing Furnace: A 128-meter horizontal electric furnace performs recrystallization annealing and reduces the surface oxide film in a hydrogen-nitrogen atmosphere.
Zinc Pot: A 100-ton ceramic induction pot maintains precise temperature control for consistent coating.
Air Knives: Precisely control coating thickness and uniformity.
Post-Coating Cooling: Solidifies the coating and controls strip temperature.
Skin Pass Mill: Improves mechanical properties and flattens the spangle.
Tension Leveler: Enhances strip flatness and shape correction.
Anti-Fingerprint Treatment: Roll-coating application for surface protection.
Exit Looper: A 180-meter vertical looper allows for exit coil changes without stopping the process section.
Recoiling Section: Precision winding of finished coils.
Material Type: Cold Rolled Hard Coil
Steel Grades: SPCC, SPCD (according to Baosteel standards)
Thickness Range: 0.2 mm to 1.2 mm
Width Range: 800 mm to 1250 mm
Maximum Coil Weight: 25,000 kg
Coil Inner Diameter: 508 mm or 610 mm
Coil Outer Diameter: Max. 2,100 mm
Oil Content: Less than 1,800 mg/m²
Yield Strength: Max. 710 N/mm²
Thickness Range: 0.2 mm to 1.2 mm
Width Range: 800 mm to 1250 mm
Maximum Coil Weight: 10,000 kg
Coil Inner Diameter: 508 mm or 610 mm
Coil Outer Diameter: Max. 1,500 mm
Coating Weight: 60 to 180 g/m² (both sides, equal thickness)
Surface Condition: Regular spangle or zero spangle
Coating Protection: Anti-fingerprint treatment; oiling (reserved)
Tensile Strength:
CQ Grade: 270-480 MPa
DQ Grade: 270-380 MPa
Product Quality Standard: Q/BQB425-2004
Annual Production Capacity: 150,000 tons
Maximum Hourly Output: 30 tons/hour (CQ grade)
Steel Grade Capability: 100% CQ; capable of producing FH and DQ grades
Line Operating Rate: 95.0%
Annual Production Hours: 6,844.56 hours
Calculated Load Rate: 95.01%
Entry Section Speed: Max. 150 m/min
Process Section Speed: Max. 120 m/min
Exit Section Speed: Max. 150 m/min
Threading Speed (Entry/Exit): 25 m/min
Acceleration (Entry/Exit): 0.25 m/s²
Acceleration (Process Section): 0.15 m/s²
Emergency Stop Deceleration: 0.4 m/s²
The furnace is the core technological equipment of the line, responsible for recrystallization annealing and surface preparation.
Type: Horizontal, electrically heated
Total Length: Approximately 128 meters
Strip Running Line Elevation: 6,700 mm
Furnace Configuration:
Entry Section: 1,000 mm
Heating Section: 80,400 mm
Soaking Section: 18,000 mm
Rapid Cooling Section: 11,700 mm
Equalizing Section: 8,000 mm
Heat Tension Roll Room: 2,700 mm
Furnace Throats: 3 × 500 mm = 1,500 mm
Total Installed Power: 7,750 kW
Furnace Rolls: 46 rolls (Φ150mm) plus 2 heat tension rolls (Φ600mm) with individual AC variable frequency drives
Heating Elements:
Electric Radiant Tubes: 99 tubes × 25 kW = 2,475 kW
Resistance Strips: 15 groups = 5,040 kW
Rapid Cooling: 3 circulating fans (45 kW each) with air-water heat exchangers
Temperature Control Zones: Multiple zones for precise heating profiles
Protective Atmosphere: High-purity N₂ + H₂ mixture
Type: Ceramic pot with industrial frequency induction heating
Capacity: Approximately 100 tons (galvalume ingot)
Function: Maintains precise molten zinc-aluminum alloy temperature for consistent coating
Function: Precisely controls coating weight and uniformity
Location: Positioned above the zinc pot for immediate coating control
Type: 4-high skin pass mill
Function: Improves mechanical properties; flattens spangle; enhances surface finish
Configuration: Two-bending, two-leveling
Elongation Control: 0.5% to 2.0%
Function: Corrects strip shape and improves flatness
Entry Looper Capacity: 300 meters (horizontal type)
Exit Looper Capacity: 180 meters (vertical type)
Function: Ensure continuous process section operation during entry/exit coil changes
The line is equipped with 6 sets of strip steering control devices to ensure precise centering:
Entry Looper: 2 sets of CPC
Furnace Entry: 1 set of CPC
After Water Quenching: 1 set of CPC
Exit Looper Outlet: 1 set of CPC
Recoiler: 1 set of EPC
Model: FNY-200C narrow lap automatic welder
Strip Thickness Capacity: 0.20 mm to 1.2 mm
Strip Width Capacity: 800 mm to 1250 mm
Lap Width: 3 mm to 5 mm
Maximum Welding Time: 45 seconds
Maximum Automatic Cycle: 60 seconds
Main Drive: Siemens AC variable frequency control system
Control Philosophy: Integrated automation for coordinated line control
Power Supply Requirements:
Low Voltage: 380V AC ±10%, 3-phase
Auxiliary: 220V AC ±10%, single-phase
Total Installed Capacity: Approximately 10,000 kW (excluding crane and lighting)
Pressure: 0.4-0.6 MPa
Flow Rate: 6-20 m³/min
Quality: Oil-free, dew point -20°C
Pressure: 0.4-0.5 MPa
Flow Rate: 200 t/h
Temperature: Max. 33°C
Pressure: 0.5-0.6 MPa
Flow Rate: 4 t/h
Conductivity: ≤10 μS/cm
Total Requirement: 130 m³/h
Heat Exchangers: 120 m³/h
Auxiliary Cooling: 10 m³/h
The line includes comprehensive mechanical and electrical equipment covering the entire production sequence from uncoiling to finished coil. Major equipment groups include:
Entry Section: Uncoilers, coil cars, pinch rolls, shears
Cleaning Section: Electrolytic degreasing tanks, brushes, dryers
Furnace Section: Complete annealing furnace with all heating elements and controls
Coating Section: Ceramic induction pot, air knives, cooling towers
Mechanical Treatment: Skin pass mill, tension leveler
Surface Treatment: Anti-fingerprint roll coating system
Exit Section: Exit looper, shear, recoiler, coil unloading cars
Support Systems: Hydraulic system, pneumatic system, lubrication systems
Automation: Siemens drives and control systems
Protective Gas System: N₂ + H₂ mixing and distribution
Drive Side: Right-hand drive
Main Span Width: 19 meters
Machine Level Elevation: +9.7 meters
High Bay Elevation: +33.5 meters
Auxiliary Span Width: 6 meters
Crane Requirements:
Entry: 32/5t crane (2 units)
Process Platform: 10t double-girder cranes
Exit: 16/3.2t crane (2 units)
High Bay: 5t crane
Zinc Pot Area: 5t single-girder crane
This 1450mm Electric Heating Galvalume Line represents a complete, integrated, and high-capacity solution for producing premium galvalume steel strips. With its advanced US Steel process technology, robust 128-meter electric annealing furnace, precision coating control systems, and comprehensive downstream processing equipment, it is capable of delivering superior quality finished products efficiently and reliably. The line is backed by Keepwin Industry's full range of services including disassembly, refurbishment, installation, and commissioning, ensuring a smooth path to renewed production.
