Overview
EN ISO 12215-3:2018 (ISO 12215-3:2002) is the CEN-adopted part of the ISO 12215 series that sets material requirements for the construction of small craft hulls, superstructures and appendages. It covers weldable steels, austenitic stainless steels, wrought aluminium alloys, wood (solid, plywood, veneer) and other suitable materials. The standard applies to small craft with a hull length (LH) up to 24 m (per ISO 8666) and provides guidance to ensure durability, manufacturability and safe long‑term performance.
Key topics and technical requirements
- Material scope: Weldable hot-rolled steels (plates, flats, sections, bars), austenitic stainless steels (plates/profiles), wrought aluminium alloys (plates, sections, extrusions), timber (solid, plywood, veneer) and other demonstrably suitable materials.
- Mechanical properties for steel:
- Normal (mild) steel: minimum yield strength Re ≈ 235 N/mm² and tensile strength Rm ≈ 340 N/mm².
- Higher‑strength steels: specified yield and tensile ranges (e.g., Re ≈ 315–390 N/mm² with corresponding Rm ranges); use requires consideration of welding, heat treatment and fatigue performance.
- Selection and manufacturing: Material selection must account for yard manufacturing practices, welding competence and equipment (see cross-reference to ISO 12215‑4 for workshop/manufacturing).
- Corrosion and compatibility:
- Galvanic potential differences must be considered when combining dissimilar metals to avoid contact corrosion.
- Protect timber from adverse reactions with adjacent metals; insulate or shield incompatible combinations.
- Special design and protection considerations for austenitic stainless steels to mitigate pitting and crevice corrosion.
- Quality and traceability: Materials must be free from prejudicial defects and be traceable via identification systems (stamping, colour coding, documentation).
- Documentation and owner information: Requirements for supplier/manufacturer documentation and information to be provided in the owner’s manual (durability, maintenance, material care).
Applications and users
EN ISO 12215-3 is intended for:
- Naval architects and marine engineers specifying hull materials and scantlings
- Boatbuilders, shipyards and fabricators selecting and fabricating hull materials
- Surveyors, classification societies and regulators assessing material suitability
- Material suppliers and QA teams for traceability and compliance documentation
- Maintenance teams and owners seeking correct care and replacement guidance
Practical applications include material selection for new-build small craft, refurbishment or repair material compatibility checks, and compliance demonstrations for conformity with EU Directive 2013/53/EU where applicable.
Related standards
Keywords: EN ISO 12215-3:2018, small craft standard, hull construction, materials steel aluminium wood, scantlings, ISO 12215.
