ISO 11950:2026

Overview

ISO 11950:2026 is an international standard developed by ISO that specifies the requirements for single and double cold-reduced electrolytic chromium/chromium oxide-coated steel (ECCS), also commonly known as tinmill steel or "tin-free steel". This standard covers ECCS products in the form of sheets and coils, intended primarily for packaging and industrial applications. The content addresses cold-reduced, non-alloy quality steels that undergo electrolytic coating to achieve specific surface characteristics and protective qualities, making them suitable for further processing and specialized end uses.

Key Topics

• Product Types and Dimensions

  • Covers both single cold-reduced ECCS (thickness: 0.150 mm to 0.600 mm) and double cold-reduced ECCS (thickness: 0.100 mm to 0.390 mm)
  • Applies to coils and sheets cut from coils, generally in minimum rolling widths of 600 mm (or 500 mm by agreement)

• Coating Processes

  • Specifies coating via either the hexavalent or trivalent chromium process, resulting in a duplex layer: metallic chromium adjacent to the steel and a hydrated chromium oxide or hydroxide top layer
  • Minimum and maximum coating masses for both total chromium and chromium in oxide are clearly defined

• Surface Finishes

  • Multiple surface finishes are available: bright, fine stone, stone, and matt, each with their own visual and tactile properties
  • Finish type influences downstream printability and lacquer adhesion

• Mechanical Properties and Test Methods

  • ECCS grades are classified by either hardness (Rockwell HR30Tm) or tensile properties (yield strength, proof strength)
  • Test methods and acceptance criteria for hardness, tensile strength, and flatness are provided

• Dimensional and Shape Tolerances

  • Tight tolerances on thickness, width, length, edge camber, and flatness to ensure compatibility with high-speed, automated manufacturing processes

• Purchaser's Information

  • Orders must specify grade, surface finish, dimensions, annealing method, and intended application
  • Options exist for further buyer-manufacturer agreement on rolling width, coating process, and other special requirements

Applications

Electrolytic chromium/chromium oxide-coated steel produced in accordance with ISO 11950:2026 offers critical performance in the following sectors:

• Food and Beverage Packaging

  • Widely used for can bodies, ends, lids, bottle caps, and closures due to its resistance to corrosion, suitability for printing/lacquering, and regulatory compliance for food contact
  • Both single and double cold-reduced ECCS perform well in stamping, drawing, bending, and beading processes

• Industrial Containers

  • Employed for aerosol cans, paint cans, oil cans, and other chemical containers where robust mechanical properties and clean surface finishes are essential

• Component Manufacturing

  • Used in making electronics enclosures, automotive components, and specialty metal packaging that requires excellent surface appearance and precise dimensional tolerances

• Print and Decorative Applications

  • Preferred for products requiring high-quality printed surfaces and protective coatings

Related Standards

Manufacturers and users of ECCS in compliance with ISO 11950:2026 should also consider the following related international standards for complementary requirements and testing methods:

• ISO 404 - Steel and steel products - General technical delivery requirements
• ISO 6508-1 - Metallic materials - Rockwell hardness test - Part 1: Test method
• ISO 6892-1 - Metallic materials - Tensile testing - Part 1: Method of test at room temperature
• ISO 10474 - Steel and steel products - Inspection documents

Summary

ISO 11950:2026 establishes clear and robust requirements for the manufacture, delivery, and quality control of cold-reduced electrolytic chromium/chromium oxide-coated steel. By adhering to this standard, producers and purchasers ensure consistent product quality, process compatibility, and a reliable basis for international trade in high-performance steel packaging materials.