SIST EN 3115:2009

Overview

EN 3115:2009 is a CEN (Aerospace series) material standard that specifies requirements for aluminium alloy 7050‑T73 wire intended for solid rivets with diameter D ≤ 10 mm used in aerospace applications. It forms part of the EN metallic materials series for aerospace and defines material designation, production form, delivery and use heat treatment, key mechanical and physical requirements, and inspection/testing conventions.

Key topics and requirements

• Material and form: Aluminium alloy 7050, delivered as cold‑drawn wire for solid rivets, maximum diameter D ≤ 10 mm.
• Heat treatment / condition: Use condition T73 (reference heat treatment sequence is specified, including solution heat, water quench and multi‑step ageing). Delivery condition code and heat‑treatment details are provided in the standard.
• Mechanical properties (as specified in the standard): proof stress, tensile strength, elongation and shear strength limits are given for the appropriate test pieces and conditions (e.g., Rp0,2, Rm, A%).
• Physical and microstructural controls:
  • Electrical conductivity requirements referenced to AMS 2658B.
  • Grain size inspection using ASTM E112 (reference grain size G is given).
  • Limits on external defects, dimensional tolerances and marking, with inspection procedures referenced to EN 2070‑6.
• Sampling and testing: Test-piece selection and test methods are referenced to EN 2070‑6 and other normative documents; full‑cross‑section tests and sample-per-batch provisions apply.
• Production and specification linkage: The standard links to general organization rules (EN 4258) and drafting rules for aluminium alloys (EN 4500‑2). Product qualification programs are to be agreed between manufacturer and purchaser.

Applications and users

• Primary application: Manufacture and procurement of solid rivets for airframe and aerospace structural assemblies where 7050‑T73 rivets are required.
• Who uses it:
  • Aircraft OEMs and Tier‑1 manufacturers specifying rivet materials.
  • Rivet and fastener manufacturers producing aluminium rivet wire.
  • Materials and metallurgical engineers involved in heat treatment and quality control.
  • Procurement, quality assurance and certification authorities verifying compliance for aerospace parts.
• Practical value: Ensures consistent mechanical performance (strength, ductility, shear), microstructure, and traceable inspection for rivet wire used in safety‑critical aerospace joints.

Related standards

• EN 2070‑6 (rivet wire technical specification)
• EN 4258 (organization of aerospace metallic standards)
• EN 4500‑2 (rules for drafting aluminium alloy material standards)
• ASTM E112 (grain size)
• AMS 2658B (conductivity inspection)

Keywords: EN 3115:2009, aluminium alloy 7050‑T73, rivet wire, solid rivets, aerospace material standard, D ≤ 10 mm, T73 heat treatment, cold‑drawn wire, mechanical properties, inspection.