SIST EN 4293:2014

Overview

SIST EN 4293:2014 is a European standard developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) and ratified by CEN. It specifies the technical requirements for aluminium alloy AL-P7175 in the T73511 temper, focusing on extruded bars and sections with cross-sectional dimensions (a or D) up to 150 mm. This standard is part of the broader aerospace series of metallic materials standards designed to ensure high-quality, reliable materials for aerospace applications.

The standard covers chemical composition, mechanical properties, heat treatment, delivery conditions, and testing protocols for this specific aluminium alloy, widely used for structural aerospace components due to its excellent strength-to-weight ratio and durability.

Key Topics

• Material Designation and Composition: Aluminium alloy AL-P7175 in the T73511 heat treatment condition is defined with precise chemical composition limits, including elements such as copper (max 2.0%), magnesium (2.1%), zinc (max 6.1%), chromium, and trace elements.

• Form and Production: Specifies extruded bars and sections up to 150 mm in diameter or thickness, produced via extrusion processes that ensure consistent structural integrity.

• Heat Treatment (T73511 Condition):

  • Solution heat treatment at 455 °C to 475 °C followed by water quenching below 40 °C.
  • Controlled stretching of 1% to 3%, minor straightening adjustments.
  • Artificial aging processes at 105 °C to 125 °C for 6 to 24 hours, and then 172 °C to 182 °C for 6 to 16 hours to achieve desired mechanical properties.

• Mechanical Properties:

  • Proof stress (Rp0.2) ranges from ≥370 MPa to ≥420 MPa depending on cross-section size.
  • Ultimate tensile strength (Rm) from ≥450 MPa to ≥485 MPa.
  • Elongation rates typically above 7–8%, ensuring adequate ductility.

• Testing and Quality Control:

  • Requirements for tensile, bending, hardness, and fracture toughness tests according to EN 4400-3.
  • Dimensional and surface defect inspections to prevent nonconformities.
  • Electrical conductivity criteria linked to material quality and stress corrosion resistance.

• Documentation and Compliance:

  • Adherence to EN 4258 for standardization frameworks.
  • Normative references include EN 4400-3 and EN 4500-2 standards.
  • Product qualification and batch uniformity inspections mandated through agreed testing programs between manufacturers and purchasers.

Applications

En 4293:2014 aluminium alloy AL-P7175 T73511 is tailored for aerospace applications, where lightweight yet high-strength materials are critical. Typical uses include:

• Aircraft structural components such as frames, longerons, and wing spars.
• High-performance extruded bars and sections for aerospace assemblies.
• Components requiring excellent fatigue resistance and dimensional stability.
• Parts exposed to demanding operational environments where mechanical and corrosion resistance properties are vital.

This standard ensures that aerospace manufacturers receive consistent, high-quality aluminium materials that meet stringent international performance and safety requirements.

Related Standards

For comprehensive aerospace material compliance, SIST EN 4293:2014 references and aligns with:

• EN 4258 – General organization of aerospace metallic material standards.
• EN 4400-3 – Technical specification for aluminium alloy bars and sections.
• EN 4500-2 – Rules for drafting and presenting material standards specific to aluminium and magnesium alloys.

These related standards provide the framework and detail necessary for material selection, testing, and certification within the aerospace industry.

Keywords: SIST EN 4293:2014, aluminium alloy AL-P7175, T73511, aerospace aluminium standards, extruded aluminium bar, aerospace materials certification, aluminium alloy specifications, aerospace extrusions, aerospace metallurgical standards, CEN aerospace standards.