Continuous annealing line (CAL)

Steel strip annealing is to even out the chemical composition and structure of the steel, refine the grain, adjust the hardness, eliminate internal stress and work hardening, and improve the forming and processing performance of the steel.

Continuous annealing is the process of heating the strip steel to an appropriate temperature under a protective atmosphere and keeping it for a certain period of time, and then cooling and overaging treatment. In order to improve the surface quality of the strip, an online leveling machine is generally designed.

Main features of the unit:

Raw material: Strip steel: Width: 600-1550mm, thickness: 0.2-1.2 (1.5) mm

Material: Cold rolled steel coil SPCC, SPCD, SPCE, in line with JISG3141

Product quality: CQ, DQ and DDQ, in line with JISG3141

Unit speed: Inlet 0-240mpm, process section, 0-180mpm, outlet section 0-240mpm

Annual output: 100,000-300,000tpy

Energy-saving method: Waste heat recovery of exhaust gas, SUNNY patent

Continuous annealing furnace: Full radiant tube heating (RTF), vertical

Fuel type: Natural gas, liquefied petroleum gas, mixed gas, coke oven gas and electricity

Welding equipment: Narrow lap seam welder

Degreasing form: Chemical degreasing + electrolytic degreasing + tertiary water rinsing, vertical or horizontal

Smoothing machine: Four-roll wet smoothing, maximum rolling force of 6,000KN

Pull straightening machine: Two bending and two straightening (Optional)

Oiling method: Electrostatic oiling

Electrical control system: SIEMENS or ABB AC frequency conversion control system

Automation instrument: SIEMENS or ABB automation control system

The main process flow of the unit:

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Uncoiling → welding → degreasing (alkali washing + alkali scrubbing + electrolysis + water scrubbing + water cleaning) → annealing reduction (heating → soaking → rapid cooling → overaging → secondary cooling → water quenching → drying) → leveling → stretching → Trimming → Inspection → Oiling → Slitting → Coiling