Overview
ISO 11950:2016 defines requirements for cold‑reduced electrolytic chromium / chromium oxide coated steel (ECCS) in the form of sheets and coils. It is a tinmill‑products standard primarily intended for packaging steels. The standard covers both single and double cold‑reduced ECCS, including nominal thickness ranges and minimum rolling widths, and specifies technical delivery conditions, testing and inspection, tolerances, packaging and labelling.
Key facts:
- Standard: ISO 11950:2016
- Product: Electrolytic chromium/chromium oxide‑coated steel (ECCS)
- Forms: Coils and sheets cut from coils
- Thickness ranges: Single cold‑reduced ECCS: 0.150–0.600 mm; Double cold‑reduced ECCS: 0.100–0.360 mm (multiples of 0.005 mm)
- Minimum rolling width: Nominal 600 mm (500 mm by agreement)
Key topics and technical requirements
ISO 11950:2016 addresses practical and quality aspects necessary for specification, procurement and testing:
- Designation and purchaser information - what must be supplied when ordering ECCS.
- Manufacturing features - manufacture, annealing, surface finish and oiling.
- Coating mass - requirements and methods to determine metallic chromium and chromium in surface oxides.
- Mechanical properties - hardness and tensile property requirements and related test methods (Annexes provide normative details).
- Dimensional tolerances and shape - thickness, feather edge, width, length, flatness (edge wave, bow, centre fullness), edge camber and out‑of‑squareness.
- Imperfection limits for coils and sheets and rules for joints within coils.
- Sampling, test methods and retesting - procedural details for laboratory verification.
- Inspection documentation, packaging and labelling - coil and sheet dispatch requirements.
- Annexes - normative and informative annexes include hardness and tensile requirements, methods for chromium determination, and Rockwell equivalents.
Practical applications and users
ISO 11950:2016 is relevant to anyone specifying, producing, testing or using ECCS for packaging applications:
- Steel producers and tinplate mills - for manufacturing and quality control of ECCS coils and sheets.
- Packaging manufacturers - especially food and beverage canmakers and other tinplate users who require coated, formable steel.
- Procurement and quality engineers - to define purchase specifications, acceptance criteria and supplier audits.
- Testing laboratories and conformity assessors - for sampling, test methods and certification evidence.
- Design and tooling engineers - to ensure material meets forming, hardness and tensile requirements.
Related standards
ISO 11950 is part of the family of tinmill and packaging steel standards developed under ISO/TC 17 (Steel). Users should consult other tinplate/blackplate and packaging‑steel standards and regional specifications for complete product and regulatory compliance.