Continuous Annealing Acid Washing Line with Bright Furnace

Continuous Annealing Acid Washing Line with Bright Furnace – High-Purity Surface Treatment for Premium Stainless Steel Strip This advanced continuous annealing acid washing line integrates a state-of-the-art bright furnace system designed to deliver superior metallurgical performance and surface quality for cold-rolled stainless steel strips. Engineered for industrial-scale production, the system ensures consistent mechanical properties, uniform grain structure, and pristine surface finish—ideal for applications demanding high corrosion resistance, formability, and aesthetic appeal. Key Features: - Dual-zone heat recovery system utilizing exhaust gas from the gas-fired heating chamber to preheat incoming strip and dry air efficiently - Enhanced sealing technology at inlet and outlet zones to prevent contamination and maintain atmosphere integrity - Integrated degreasing and pickling sections for thorough oil removal and oxide layer elimination - Modular SINAMICS S120 drive system with variable frequency control and common DC bus architecture for precise speed regulation and energy efficiency - Robust dual-axis gearbox and motor configuration for stable tension control during strip handling Detailed Description: The core innovation lies in the seamless integration of thermal processing and chemical cleaning within a single continuous flow. The bright annealing furnace employs controlled atmosphere heating to eliminate residual stresses without oxidation, while the acid washing unit removes mill scale and impurities through optimized pickling solutions. This two-stage approach not only restores the original luster of the stainless steel but also enhances its ductility and weldability. The degreasing zone utilizes high-pressure alkali spray nozzles combined with roller squeezing mechanisms to ensure complete removal of oils and contaminants before entering the high-temperature zone. By isolating the alkaline spray chamber from downstream processes, the system minimizes cross-contamination risks and improves overall process stability. Ideal Applications: This line is widely adopted in manufacturing sectors such as automotive trim, kitchen appliances, architectural cladding, and precision engineering components where surface aesthetics and material consistency are critical. It supports both thin gauge (0.1–3.0 mm) and wide strip formats, making it suitable for diverse industries including aerospace, electronics, and medical device fabrication. User Feedback: Operators report significant reductions in scrap rates due to improved surface uniformity and fewer defects like staining or grain boundary damage. Maintenance personnel appreciate the modular design, which simplifies component replacement and reduces downtime. Customers note enhanced product shelf life and better adhesion for subsequent coating or plating operations. Frequently Asked Questions: What makes this annealing line different from traditional batch furnaces? It offers continuous processing with precise temperature zoning, faster throughput, and consistent metallurgical outcomes across the entire strip length. Can it handle various stainless steel grades? Yes, it is compatible with austenitic, ferritic, and duplex grades including 304, 316, 430, and 2205, provided appropriate process parameters are set. How does the system ensure environmental compliance? By incorporating closed-loop water recycling, efficient gas utilization, and minimal chemical discharge, the line meets international emissions standards for industrial metal finishing. Is operator training required? While the system is user-friendly, technical staff should be familiar with automation controls, safety protocols, and basic maintenance procedures for optimal operation.