SIST EN 2696:2005

Overview

EN 2696:2005 is a CEN/AECMA aerospace material standard that defines requirements for aluminium alloy AL‑P7075 in tempers T6 or T62, supplied as sheet and strip with thicknesses 0.4 mm ≤ a ≤ 6 mm. It is part of the EN aerospace metallic materials series and links to general rules in EN 4258, EN 4400‑2 and EN 4500‑2.

Key topics and technical requirements

• Scope: Covers chemical composition, production method (rolled sheet/strip), dimensional range and delivery/usage conditions for aerospace applications.
• Chemical composition (limits given in the standard): examples include Si ≤ 0.40%, Fe ≤ 0.50%, Cu 1.2–2.0%, Mg 2.1–2.9%, Cr 0.18–0.28%, Zn 5.1–6.1%, with aluminium as the base. (See EN 2696 table for full element limits.)
• Delivery and use conditions:
  • Solution treatment: 460 °C ≤ θ ≤ 485 °C, water quench (WQ θ ≤ 40 °C).
  • Artificial ageing: 115 °C ≤ θ ≤ 135 °C for 20–30 h to achieve T6 or T62 tempers.
• Mechanical properties: EN 2696 specifies mechanical limits by thickness band. In the annealed/soft condition properties are low (e.g., proof stress and tensile strength limited for O). In T6/T62 the standard requires high proof and tensile strengths (proof stress ≈ ≥460–475 MPa, tensile strength ≈ ≥525–540 MPa, with minimum elongation values varying by thickness - see standard tables).
• Physical/other characteristics: Typical electrical conductivity (19.0 MS/m) and typical hardness (160 HB). Hardness variation limits are specified (e.g., ∆ ≤ 20 per product, ∆ ≤ 30 per batch).
• Testing and inspection: Reference to EN 4400‑2 for test pieces, sampling, external defects, batch uniformity, marking and dimensional inspection. Product qualification programs are to be agreed between manufacturer and purchaser.

Applications and users

• Primary users: aerospace OEMs, structural engineers, materials and metallurgical engineers, procurement/specification teams, and aluminium sheet/strip manufacturers and suppliers.
• Practical uses: specification and procurement of high‑strength aluminium sheet and strip for aircraft structural components, fittings, and other aerospace parts where high strength-to-weight is required and controlled heat-treatment/quality is mandatory.
• Why it matters: EN 2696:2005 ensures consistent chemical, mechanical and processing requirements for AL‑P7075 sheets to meet aerospace safety, performance and traceability expectations.

Related standards

• EN 4400‑2 - Aluminium and aluminium alloy wrought products: technical specification (Part 2: sheet and strip)
• EN 4258 - General organization of aerospace metallic material standardization
• EN 4500‑2 - Rules for drafting/presentation of aluminium alloy material standards

Keywords: EN 2696:2005, AL-P7075-T6, AL-P7075-T62, aerospace aluminium, sheet and strip 0.4–6 mm, mechanical properties, chemical composition, heat treatment, EN 4400-2, CEN.