EN 2320:2019

Overview

EN 2320:2019 is a CEN (ASD‑STAN) aerospace series standard that specifies requirements for aluminium alloy 2024‑T4 drawn bars with a cross‑section dimension a ≤ 75 mm. It defines chemical composition limits, form and production method (drawn bar), delivery condition (T4 heat treatment), and inspection/qualification expectations for use in aerospace applications.

Key topics and technical requirements

• Material designation: Aluminium alloy 2024‑T4 (drawn bar).
• Form and production: Bars produced by drawing; specified form is “Bar”.
• Limit dimension: Cross‑section dimension a ≤ 75 mm (as per title).
• Chemical composition (typical limits from table):
  • Si ≤ 0.50%, Fe ≤ 0.50%
  • Cu 3.8% – 4.9%
  • Mn ≈ 0.30% – 0.90%
  • Mg ≈ 1.20% – 1.80%
  • Cr ≤ 0.10%, Zn ≤ 0.25%, Ti ≤ 0.15%, Ti+Zr ≤ 0.20%
  • Other elements: each ≤ 0.05%, total ≤ 0.15%; aluminium remainder
• Heat treatment / delivery condition: T4 - solution treated (specified 495 °C ± 5 °C), water quenched and naturally aged.
• Mechanical / test references: Direction of test pieces = longitudinal (L); hardness listed as 120 (for information). Other mechanical properties and detailed testing (proof stress, tensile strength, elongation) are identified in the standard layout but are to be applied per purchaser agreement or referenced technical specifications.
• Testing and inspection: Electrical conductivity testing referenced to EN 2004‑1. Dimensional tolerances and forms reference EN 2044–EN 2046 (round, square, hexagonal drawn bar dimensions). Marking and dimensional inspection required; product qualification program to be agreed between manufacturer and purchaser.

Applications and users

• Primary use: Structural and mechanically loaded components in aerospace assemblies where high‑strength aluminium (2024‑T4) drawn bar is required.
• Who uses this standard:
  • Aerospace materials engineers and designers specifying raw materials
  • Manufacturers of drawn aluminium bars and aerospace parts
  • Purchasing and quality assurance teams validating incoming material
  • Metallurgists and testing laboratories performing conformity tests
• Practical value: Ensures consistent chemical composition, production route (drawn), heat treatment (T4) and inspection criteria for aluminium 2024 bars used in safety‑critical aerospace structures.

Related standards

• EN 2004‑1 - Test method for electrical conductivity of wrought aluminium alloys
• EN 2044, EN 2045, EN 2046 - Dimensional standards for round, square and hexagonal drawn bars (tolerance class h11)
• EN 4258 - Organization of metallic materials standards in aerospace series
• EN 4500‑003 - Rules for drafting material standards (used in preparation of this document)

Keywords: EN 2320:2019, Aluminium alloy 2024‑T4, drawn bar, aerospace standard, T4 heat treatment, EN 2004‑1, EN 2044, drawn bars a ≤ 75 mm.