ISO 3575:2025 PDF

Overview

ISO 3575:2025 specifies requirements for continuous hot-dip zinc-coated and zinc‑iron alloy‑coated carbon steel sheet supplied in coils and cut lengths. The standard covers products intended for applications that require corrosion resistance, formability, and paintability. It defines product designations, coating masses and finishes, surface treatments and testing & inspection regimes for commercial and drawing qualities (not structural steels covered by ISO 4998).

Keywords: ISO 3575:2025, hot-dip zinc-coated, zinc-iron alloy-coated, carbon steel sheet, coating mass, formability, paintability, corrosion resistance.

Key Topics and Technical Requirements

• Scope and product types: Continuous hot-dip zinc-coated and zinc-iron alloy-coated sheet for commercial, drawing, deep-drawing and interstitial-free qualities.
• Dimensions and tolerances: Coil and cut-length dimensional and shape tolerances are specified to ensure interchangeability and fit for fabrication.
• Conditions of manufacture:
  • Steelmaking and chemical composition controls (heat and product analysis).
  • Mechanical properties and fabrication quality designations (commercial, drawing, deep drawing, IF steel).
• Coating requirements:
  • Coating mass classes and notation (new coating mass designations such as Z080, Z120, Z140, Z220, ZF080, ZF120 added in this edition).
  • Coating adherence and coating condition (zinc vs zinc‑iron alloy).
• Surface treatments and finish: Mill passivation, mill phosphating, oiling and painting compatibility for improved paintability and handling.
• Weldability and forming characteristics required for fabrication and assembly.
• Sampling, test methods and inspection:
  • Tensile and bend tests (reference to ISO 6892‑1, ISO 7438).
  • Coating mass measurement methods (ISO 1460, ISO 2178, ISO 3497).
  • Coating adherence and spot tests (single-spot, triple-spot).
• Designation, marking and purchaser information: Standardized naming and information to be supplied by purchaser; requirements for coil size and marking.

Practical Applications and Users

ISO 3575:2025 is used by:

• Steel producers and continuous hot-dip coating lines to define product supply and quality.
• Automotive, household appliance and furniture manufacturers for corrosion‑protected, formable sheet.
• OEMs and fabricators specifying materials for stamping, drawing and painted components.
• Paint shops, coating applicators and contract manufacturers concerned with paintability and surface pre-treatment.
• Inspection bodies and testing laboratories performing conformity checks.

Benefits include predictable corrosion performance, consistent forming behavior and assurance of paint adhesion for downstream manufacturing.

Related Standards

• ISO 4998 - structural quality steels (not covered by ISO 3575)
• ISO 1460, ISO 2178, ISO 3497 - coating measurement methods
• ISO 6892-1 - tensile testing
• ISO 7438 - bend test
• ISO 16163 - continuously hot-dipped coated steel sheet tolerances

For procurement or technical implementation, refer to the full ISO 3575:2025 document from ISO or your national standards body.