Overview - ISO 12215-3:2002 (Small craft - Materials)
ISO 12215-3:2002 specifies material requirements for the hull, superstructure and appendages of small craft (hull length LH up to 24 m per ISO 8666). It covers the selection, properties and documentation of materials commonly used in small craft construction: weldable hot‑rolled steels, austenitic stainless steels, wrought aluminium alloys, wood (solid timber, plywood, veneers) and other suitable materials. The part focuses on durability, manufacturability (welding, forming), corrosion risk and traceability for marine use.
Key topics and technical requirements
- Scope and applicability: Applies to small craft up to 24 m LH and complements other ISO 12215 parts on laminates, sandwich cores, workshop practice and scantling determination.
- Material suitability: Materials must be suitable for marine environments and intended manufacturing methods and comply with relevant international/national standards or classification society rules.
- Steel requirements:
- Normal (mild) steel preferred for ductility and weldability. Minimum properties cited: yield R_eH = 235 N/mm², tensile R_m = 340 N/mm².
- Higher‑strength steels allowed with specified yield and tensile ranges (e.g., yield ~315–390 N/mm²) but require consideration of fatigue, welding heat effects and post‑processing.
- Austenitic stainless steels may be used with attention to pitting/crevice corrosion, galvanic isolation and suitable alloy selection for marine service.
- Aluminium alloys:
- Both non‑heat‑treatable (Mg‑containing) and heat‑treatable (Si/Mg) alloys may be used; welding can reduce properties.
- Aluminium‑copper and aluminium‑zinc groups are generally discouraged for hull structure unless specially protected or used only in freshwater.
- Wood and plywood:
- Timber durability classes (1–4) guide species selection; marine‑grade plywood required for exposed structural members.
- Moisture limits and sawing orientation (quarter‑sawn for planking) are specified to reduce warping and ensure dimensional stability (encapsulated timber ≤15% moisture).
- Material combinations & corrosion: Guidance on galvanic potential, contact corrosion, insulation and shielding between dissimilar materials.
- Documentation & traceability: Suppliers must provide data sheets and identification systems; owners’ manual information is required.
Applications - who uses ISO 12215-3
- Boat designers and naval architects specifying hull materials and scantlings for small craft
- Shipyards and boatbuilders choosing steels, aluminium alloys, timber and composites
- Material suppliers, classification societies and surveyors validating marine suitability
- Maintenance teams referencing recommended materials, corrosion control and repair practices
Related standards
- ISO 12215 (other parts: 1, 2, 4, 5, 6) - comprehensive hull construction guidance
- ISO 8666 - principal data for small craft
Keywords: ISO 12215-3, small craft materials, hull construction, steel, aluminium alloys, marine wood, scantlings, marine corrosion, marine-grade plywood, material traceability.
Open preview (PDF)Small craft — Hull construction and scantlings — Part 3: Materials: Steel, aluminium alloys, wood, other materials