EN 3332:2005

Overview

EN 3332:2005 is a CEN (European) aerospace material standard that specifies requirements for aluminium alloy AL‑P7475 in the T762 temper, supplied as clad sheet and strip with nominal thicknesses in the range 1.0 mm ≤ a ≤ 6 mm. Prepared by AECMA‑STAN and adopted by CEN, the standard defines chemical limits, production form, heat treatments, mechanical performance, corrosion and fracture‑toughness expectations, and inspection/testing references for aerospace use.

Key topics and technical requirements

• Material designation: Aluminium alloy AL‑P7475‑T762, clad.
• Form and dimensions: Rolled sheet and strip, clad, thickness 1.0–6 mm (sub‑ranges used for property limits).
• Chemical composition: Elemental limits given for Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti and Al (e.g., Cu ~1.2–1.9%, Mg ~1.9–2.6%, Zn ~5.2–6.2%, Cr ~0.18–0.25% - see standard for exact limits).
• Cladding: Cladding alloy AL‑P7072 with composition controls specified.
• Heat treatment / delivery conditions: Solution heat treatment at ≈460–485 °C with quench (θ ≤ 40 °C) and subsequent ageing cycles (e.g., ~115–125 °C for 3–6 h and ~158–178 °C for 14–70 h) to achieve T762 temper.
• Mechanical properties: The standard sets minimum/maximum limits for proof stress (Rp0.2) and tensile strength (Rm) in O and T762 conditions (e.g., Rm up to ≈268 MPa in O; Rm ≥ ~450–470 MPa in T762 depending on thickness). Consult the standard tables for thickness‑dependent values.
• Fracture toughness: Specified minima (K_IC) - ≥95 MPa·m^0.5 for 1.0–3.2 mm and ≥85 MPa·m^0.5 for 3.2–6 mm.
• Corrosion and conductivity: Exfoliation corrosion acceptance per EN 4400‑2; electrical conductivity thresholds (e.g., γ ≥ 22.7 MS/m acceptable; lower bands subject to conditions).
• Testing & inspection: Tensile, dimensional, marking, corrosion and other tests referenced to EN 4400‑2 and standardized sampling/qualification rules.

Applications and users

• Intended for aerospace applications where high‑strength, clad aluminium sheet/strip is required. Typical users include:
  • Aerospace material engineers and specifiers
  • Aircraft structural designers and manufacturers
  • Procurement and quality engineers in aero supply chains
  • Material testing and certification laboratories
• Use cases include structural components and assemblies where strength, fracture toughness and controlled corrosion performance are critical (refer to OEM/component specifications before selection).

Related standards

• EN 4400‑2 - Aerospace series: Aluminium wrought products - Part 2: Sheet and strip (technical specification and testing)
• EN 4258 - Organization of metallic aerospace material standards
• EN 4500‑2 - Rules for drafting material standards (aluminium alloys)
• AECMA (now ASD-STAN) prestandards and CEN implementation documents

For design, procurement and certification, always consult the full EN 3332:2005 text and referenced documents to apply the detailed tables, sampling frequencies and acceptance criteria.