Galvanized Steel Coil Slitting Deep Processing: Process, Applications & Value Analysis

1. Slitting Production Process of Galvanized Steel Coil

1. Raw Coil Pretreatment: Uncoil and level the galvanized steel coil to eliminate material stress and ensure substrate flatness.
2. Longitudinal Shearing: Use a CNC slitting machine to cut the raw coil into narrow-width coils per customer-specified widths (tolerance ±0.1mm), with a slitting speed of 80-120m/min, suitable for galvanized steel coils of 0.2-4.0mm thickness.
3. Rewinding & Quality Inspection: The slit narrow coils are organized into standard rolls via tension rewinding machines. Simultaneously, inspect slit width, edge burrs (≤0.05mm), and zinc layer integrity to ensure finished products meet process requirements.
4. Packaging Protection: Adopt rust-proof paper + steel strap bundling for export packaging to avoid zinc layer damage during transportation.

2. Applications of Slit Products

1. Construction Sector: Medium-width slit coils (300-800mm) are pressed into floor decks, roof tiles, and light steel keels, serving as enclosure and load-bearing components for steel structure buildings.
2. Automotive Industry: Narrow-width slit coils (100-300mm) are used for stamping door frames and chassis parts, leveraging the zinc layer’s corrosion resistance to enhance component durability.
3. Home Appliance Industry: Custom-width slit coils are applied to stamping refrigerator casings and washing machine inner tubs, meeting the standardized size requirements of home appliance products.
4. Hardware Manufacturing: Ultra-narrow slit coils (50-100mm) are used to make hardware accessories and shelf connectors, adapting to mass production of small-size components.

3. Customization Services & ISO Compliance

1. Customization Dimensions: Support full-dimensional customization of slit width (50-1500mm), rewinding inner diameter (Φ508/Φ610mm), and surface finish (spangled/smooth). Specifications can be adjusted according to customers’ processing equipment parameters.
2. Compliance Guarantee: The entire slitting production follows the ISO 9001 quality management system. Finished products come with slitting process reports, material certificates, and zinc layer thickness test reports, consistent with the raw coil in meeting international standards (ASTM/JIS/EN), satisfying compliance audits for global projects.

4. Development Prospects

1. Expanding Customization Demand: The proportion of small-batch, multi-spec slitting orders is rising, driving slitting processes toward "flexibility and high precision".
2. High-Value-Added Extension: Slitting can be linked to subsequent processing (e.g., stamping, bending) to form an integrated "raw coil - slitting - deep processing" service, increasing product value.
3. Green Trend: The application of low-zinc-consumption slitting processes and recyclable packaging will further align with global environmental policies and expand high-end market share.