Overview
ISO 5002:2025 - Hot-rolled and cold-reduced electrolytic zinc-coated carbon steel sheet of commercial and drawing qualities - specifies requirements for electrolytic zinc-coated carbon steel sheet intended for formed or miscellaneous parts. This fifth edition updates terminology and introduces a new designation system. The product can be supplied chemically treated to improve paintability and is produced primarily in thicknesses from 0.36 mm to 4.0 mm and widths of 600 mm and over (coils or cut lengths).
Keywords: ISO 5002:2025, electrolytic zinc-coated, carbon steel sheet, hot-rolled, cold-reduced, commercial quality, drawing quality, coating mass, coating thickness.
Key topics and technical requirements
ISO 5002:2025 covers technical subjects essential to manufacturing, inspection and procurement of electrolytically zinc-coated sheet:
- Material scope and definitions - commercial, drawing, deep-drawing and interstitial-free steels; lot and differential coating definitions.
- Dimensions and tolerances - thickness specification options (base-metal alone or base-metal plus coating) and dimensional/shape tolerances for coils and cut lengths.
- Steelmaking and chemical composition - requirements for base-metal chemistry and agreed analysis methods (heat and product analysis).
- Coating requirements - coating mass, coating thickness, and coating adherence (including differential coatings).
- Mechanical properties and formability - tensile properties, bend/drawing characteristics and strain-ageing considerations.
- Fabrication characteristics - weldability, skin passing, and fabrication qualities for forming or drawing.
- Surface treatment and paintability - mill passivation, surface preparation for painting, chemical treatments, oiling and painting notes.
- Sampling and test methods - tensile testing (see ISO 6892-1), bend tests (ISO 7438), coating mass and adherence tests, inspection, retests and resubmission.
- Marking, coil size and purchaser information - requirements for marking and information to be supplied with orders; Annex A on thickness specified as base-metal.
Applications and who uses it
ISO 5002:2025 is used by:
- Steel producers and galvanizing plants specifying electrolytic zinc-coated sheet.
- OEMs and fabricators in automotive, appliances, HVAC, and general sheet-metal forming where corrosion protection and formability matter.
- Procurement, quality and inspection teams verifying coating mass, thickness and mechanical properties.
- Paint and surface-treatment suppliers ensuring pre-treatment and passivation meet painting requirements.
Related standards
Standards referenced within ISO 5002:2025 include:
Use ISO 5002:2025 to align specifications, testing and acceptance criteria for electrolytic zinc-coated carbon steel sheet across supply chains while ensuring paintability and formability for manufactured parts.