SIST EN 4286:2005

Overview

SIST EN 4286:2005 is a European Standard developed by CEN, specifying the technical and quality requirements for die forgings made from Aluminium alloy AL-P8090-T89 with a thickness (a) of 125 mm or less. This standard is part of the aerospace series of metallic material standards designed to ensure consistent quality and performance of aerospace materials. It was prepared by the European Association of Aerospace Manufacturers (AECMA-STAN) and has been adopted by multiple national standard bodies across Europe.

The scope of SIST EN 4286:2005 covers the chemical composition, mechanical properties, heat treatment conditions, and testing protocols for AL-P8090-T89 aluminium alloy used in critical aerospace applications. It aligns with related standards such as EN 2082-3 and EN 4258, ensuring compatibility and comprehensive coverage for aerospace manufacturing needs.

Key Topics

• Material Specification: Defines Aluminium alloy AL-P8090-T89 die forgings with hardness and composition limits specifically suited for aerospace components.
• Maximum Dimension: Applies to die forgings with thickness up to 125 mm, focusing on optimizing mechanical properties within this size limit.
• Chemical Composition: Specifies limits for elements such as Silicon (Si), Iron (Fe), Copper (Cu), Magnesium (Mg), Zinc (Zn), Lithium (Li), and others to maintain alloy consistency.
• Heat Treatment: Details the T89 temper-solution heat treatment within 525 °C to 535 °C, water quenching, and artificial aging between 170 °C to 180 °C for 20 to 30 hours, with controlled cold deformation.
• Mechanical Properties: Includes minimum proof stress (R p0.2) of 330 MPa, tensile strength (R m) of 430 MPa, elongation percentages, and fracture toughness values critical for aerospace safety and reliability.
• Testing Methods: Requires fracture toughness, internal/external defects inspections, density measurement by displacement, and other mechanical tests as per referenced standards (EN 2082-3, EN 6018).
• Quality Control: Mandates strict dimensional inspection, batch uniformity checks, and marking requirements to ensure traceability and conformance.
• Product Qualification: Qualification processes are agreed upon between manufacturers and purchasers, supporting custom aerospace manufacturing demands.

Applications

SIST EN 4286:2005 aluminium alloy AL-P8090-T89 die forgings are primarily intended for aerospace applications, where lightweight, high-strength materials are critical. Specific use cases include:

• Aircraft Structural Components: Critical load-bearing parts benefiting from high tensile strength and toughness.
• Engine Components: Parts requiring excellent mechanical performance under thermal and dynamic stresses.
• Aerospace Forgings: Precision die forging products with controlled composition and mechanical properties for airframes and systems.
• Lightweight Assemblies: Aerospace designs emphasizing weight reduction without compromising durability or safety.

Manufacturers and suppliers use EN 4286 to ensure compliance with industry-recognized aerospace materials specifications, promoting reliability and uniformity in aerospace material supply chains.

Related Standards

SIST EN 4286:2005 complements and references several key aerospace standards to provide a complete framework for aluminium alloy forgings:

• EN 2082-3: Aerospace series - Aluminium alloy forging stock and forgings - Technical specification – provides detailed technical requirements and testing methods.
• EN 4258: General organization of metallurgical standardization for aerospace materials - defines how related standards interact and are used.
• EN 4291: Defines specifications for AL-P8090 forging stock, ensuring raw material consistency.
• EN 4500-2: Drafting and presentation rules specific to aluminium and magnesium alloy standards ensuring clarity and uniformity.
• EN 6018: Test method for determining density by displacement for metallic aerospace materials.

These interconnected standards deliver a robust system for controlling the quality, safety, and performance of aerospace aluminium forgings in compliance with international aerospace manufacturing requirements.

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