Stainless steel annealing and pickling unit (CAPL)

　　 I Cold Rolled Stainless Steel Annealing and Pickling Unit

　　The annealing and pickling process for cold-rolled stainless steel can be divided into intermediate annealing and pickling and final annealing and pickling. The main purpose is to recrystallize the cold-rolled stainless steel after annealing to eliminate work hardening, thereby softening it and improving its mechanical properties. Pickling then removes impurities such as iron oxide scale produced during annealing, further improving the surface quality of the strip.

 

　　 Main Features of the Unit:

　　Raw Material Types: Cold-rolled stainless steel CrAISI200/300/400 series

　　Raw Material Specifications: 0.2-2.0mmX800-1600mm

　　Unit Process Speed: 80-130mpm

　　Product Quality: 2B, conforms to JISG4304 and GB4237-2007

　　Annealing Furnace Section: A combination of preheating and natural gas open flame heating sections is used, with an air heat exchanger to preheat the combustion air, resulting in high heating efficiency and thermal utilization.

　　Pickling Process: For cold-rolled austenitic stainless steel: Neutral salt electrolysis (Na2SO4) + mixed acid (HNO3+HF) pickling

　　For ferritic and martensitic stainless steel: Neutral salt electrolysis (Na2SO4) + nitric acid (HNO3) electrolytic pickling

　　Electrical Control System: Uses a SIEMENS AC frequency conversion speed control system, with a user-friendly interface and simple equipment maintenance.

　　Industrial Automation: Uses a SIEMENS system for process automation control.

 

　　 The main process flow includes:

　　Uncoiling, Welding, Annealing, Cooling, Pickling, Rinsing, Recoiling, Coil Winding

　　II Hot-Rolled Stainless Steel Annealing and Pickling Unit

　　The hot-rolled stainless steel annealing and pickling unit has annealing, descaling, and pickling sections. Its main purpose is to recrystallize the hot-rolled stainless steel after annealing to eliminate work hardening, thereby softening it and improving its mechanical properties. Pickling removes impurities such as iron oxide scale produced during annealing, further improving the surface quality of the strip and facilitating the cold rolling process.

　　Designed production capacity is 150,000-300,000 tons/year. Raw material types are 200/300/400 series stainless steel (conforming to GB/T709 standard), with specifications of 1000-1350mmX2-3mm. The designed unit process speed is Max. 50m/min. The unit's process sections mainly complete annealing, descaling, and pickling processes. Product quality conforms to JISG4304 and GB4237-92 standards.

 

　　 Main Features of the Unit:

　　The advanced production process combines annealing, descaling, and pickling to ensure product quality.

　　Annealing Furnace Section: Uses a combination of preheating and direct gas heating sections, with an air heat exchanger to preheat the combustion air, effectively improving heating efficiency and thermal utilization.

　　Descaling Shot Blasting: After annealing, a combination of straightening, descaling, and shot blasting is used to effectively remove and break down iron oxide scale, facilitating pickling.

　　Pickling Process: The pickling section uses pre-cleaning, sulfuric acid electrolytic pickling, mixed acid (HNO3+HF) pickling, and cascade rinsing to ensure pickling effectiveness.

　　Electrical Control System: Uses a SIEMENS AC frequency conversion speed control system, with a user-friendly interface and simple equipment maintenance.

　　Industrial Automation: Uses a SIEMENS system for process automation control.

 

　　 Process Flow:

　　Coil Loading → Uncoiling → Pinch Roll Straightening → Head and Tail Cutting → Welding → (Inlet Loop →) Annealing → Air Cooling → Water Spray Cooling → Hot Air Drying → Shot Blasting → Brushing → Sulfuric Acid Pickling → Mixed Acid Pickling → Cascade Rinsing → Hot Air Drying → (Outlet Loop →) Horizontal Inspection → Shearing → Coil Winding → Paper Padding → Coil Unloading → Packaging