ISO 5002:2013

Overview

ISO 5002:2013 specifies requirements for hot-rolled and cold-reduced electrolytic zinc‑coated carbon steel sheet of commercial and drawing qualities. It covers sheets supplied in cut lengths or coils, with zinc coatings applied by electrolytic deposition. The standard defines coating thickness (expressed in micrometres per side), chemical composition limits for common grades, manufacturing conditions, testing, inspection and marking. Typical product ranges described include base‑metal thicknesses normally from 0.36 mm to 4.0 mm and coil widths 600 mm and over, though other sizes can be agreed between purchaser and supplier.

Key topics and technical requirements

• Coating specification: Zinc coating is expressed in µm per surface for equally coated, differentially coated, or one‑side coated products (examples include ZE 10 ≈ 1.0 µm/surface, ZE 25 ≈ 2.5 µm/surface). Coatings are generally not intended for long‑term outdoor exposure without chemical treatment and painting.
• Base metal and thickness rules: Thickness may be specified as base metal alone or as combined base metal + coating; purchaser must indicate preference (Annex A covers base‑metal thickness specification).
• Steel grades and chemistry: Defines hot‑rolled (HR1–HR4) and cold‑rolled (CR1–CR5) quality designations and maximum elemental limits (carbon, manganese, phosphorus, sulfur, stabilizers such as Ti/Nb/V for deep‑drawing grades).
• Mechanical and fabrication properties: Requirements for bendability, weldability, skin‑pass effects, and strain‑ageing considerations for drawing qualities. Mandrel/bend test requirements and mechanical testing per referenced methods.
• Surface treatment & finishing: Options for chemical treatment to improve paintability, oiling, and painting guidance.
• Quality control & testing: Heat and product chemical analyses, tensile and coating tests, sampling, inspection, acceptance criteria, retest and resubmission processes.
• Coil and product marking: Rules for coil size, marking and purchaser information required at order.

Practical applications and users

• Typical applications: formed parts, stamped components, appliance shells, automotive inner panels, and miscellaneous formed steel parts where corrosion protection and paintability are required.
• Primary users: steel producers, galvanizing/electroplating lines, OEMs (automotive, appliances), fabricators, purchasers/inspectors, and quality engineers specifying coated steel for forming and painting operations.

Related standards

• ISO 6892‑1 (tensile testing at room temperature)
• ISO 7438 (bend test)
• ISO 16160 / ISO 16162 (dimensional and shape tolerances for hot‑ and cold‑rolled sheet)

ISO 5002 is a practical reference for specifying electrolytic zinc‑coated sheet for forming, painting and general fabrication - helping ensure consistent coating, chemistry and mechanical behavior for downstream manufacturing and finishing processes.