Continuous decarburization and annealing unit for cold-rolled silicon steel (CNGO)

　　For cold-rolled non-oriented silicon steel (CNGO) Surface degreasing is performed, and decarburization annealing and recrystallization annealing are performed in a protective atmosphere. The carbon content of the strip is reduced to the specified range, the grain size is increased, the magnetic level is improved, stress is eliminated, and an insulating layer is applied.

 

　　 Main Technical Parameters

　　Raw materials: Cold-rolled hard-state steel coils of non-oriented electrical steel (Si≤2.0%) W470-W1300

　　Strip carbon content: C≤50ppm

　　Strip thickness: 0.35-0.65mm

　　Strip width: 900-1250mm

　　Product: Cold-rolled electrical steel coil

　　Representative specifications: 50W470-50W600 50W800-50W1300

　　Quality standard: GB/T2521-1996

　　Carbon content: C≤27ppm

　　Unit speed: Inlet 0-200mpm, process section 0-135mpm, outlet section 0-200mpm

　　Annual output: 200,000tpy

　　Energy saving method: Comprehensive utilization of waste gas heat recovery, SUNNY patent

　　Continuous decarburization annealing furnace: Non-oxidizing heating (NOF) + full radiation tube heating (RTF), vertical and horizontal

　　Fuel type: Natural gas, liquefied petroleum gas

　　Decarburization method: Continuous decarburization with protective gas

　　Insulating layer coating: Using roller coater + coating drying and curing

　　Welding equipment: Narrow lap seam welder

　　Degreasing method: Chemical degreasing + electrolytic degreasing + three-stage water rinsing, vertical or horizontal

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

　　Industrial automation: SIEMENS or ABB intelligent automatic control system

 

　　 Main production process flow

 

 

　　Uncoiling → Welding → Degreasing (alkaline spraying → alkaline scrubbing → electrolytic degreasing → hot water cleaning → drying) → Decarburization annealing → Cooling → Coating insulation layer → Sintering → Cooling → Surface inspection → Slitting → Coiling