EN 4450:2005

Overview

EN 4450:2005 is a European Standard published by CEN that specifies the requirements for aluminium alloy AL-P7050-T762 in sheet form with thicknesses ranging from 0.8 mm to 6 mm. This standard is part of the aerospace series, targeting materials used specifically for aerospace applications. The AL-P7050-T762 alloy is a high-strength aluminium alloy optimized for critical aerospace structural components, ensuring reliability, durability, and compliance with stringent quality standards.

The standard includes detailed chemical composition limits, manufacturing processes, mechanical property requirements, and testing methods to guarantee performance. It aligns with related aerospace standards, making it essential for manufacturers and suppliers of aluminium sheets intended for the aviation and aerospace industries.

Key Topics

• Material Specification
  Defines aluminium alloy AL-P7050-T762 sheet with thickness between 0.8 mm and 6 mm intended for aerospace use.

• Chemical Composition
  Specifies precise limits on elements such as Silicon (Si), Iron (Fe), Copper (Cu), Manganese (Mn), Magnesium (Mg), Chromium (Cr), Zinc (Zn), Zirconium (Zr), Titanium (Ti), and Aluminium (Al) to maintain alloy consistency and performance.

• Manufacturing Processes
  Covers rolling methods for producing sheets and heat treatment cycles, including the delivery condition (O) and use condition (T762), ensuring optimal mechanical properties.

• Mechanical Properties
  Includes key mechanical requirements such as

  • Proof stress (>460 MPa for thicker sheets)
  • Tensile strength (>500 MPa)
  • Elongation (minimum 7% for thicknesses above 1.6 mm)
    These properties guarantee structural integrity and fatigue resistance in aerospace components.

• Testing and Inspection
  References EN 4400-2 for test samples, dimensional inspection, marking, and checking for external defects, ensuring compliance with rigorous aerospace quality standards.

• Heat Treatment Details
  Specific heat treatment regimes provided to achieve the T762 temper condition, critical for taking full advantage of the alloy's mechanical performance.

Applications

EN 4450:2005 aluminium alloy AL-P7050-T762 sheets are widely used in aerospace manufacturing where lightweight, high-strength metal sheets are essential. Typical applications include:

• Aircraft structural components such as wing skins, fuselage panels, and bulkheads
• Aerospace frames and supports requiring high fatigue resistance
• High-performance aerospace assemblies subjected to dynamic loading
• Parts where corrosion resistance combined with mechanical strength is necessary

The standard ensures that materials used in these applications meet stringent aerospace requirements, contributing to aircraft safety and performance.

Related Standards

EN 4450:2005 is part of a comprehensive series of aerospace metallic material standards and references several key standards for proper implementation:

• EN 4258 - General organization of aerospace metallic material standards, defining the framework and relationships between different material specifications.
• EN 4400-2 - Technical specifications for aluminium and aluminium alloy wrought products, giving rules on sheet and strip materials testing.
• EN 4500-2 - Rules for drafting and presenting aluminium and magnesium alloy material standards, ensuring consistent documentation.

These related documents provide additional guidance on testing, quality assurance, and material handling for aerospace aluminium alloys.

Keywords: EN 4450:2005, aluminium alloy AL-P7050-T762, aerospace aluminium sheet, aerospace materials standard, aluminium sheet 0.8 to 6 mm, aerospace structural materials, aluminium alloy mechanical properties, aerospace manufacturing standards, CEN aluminium standards, aerospace grade aluminium sheet.