SIST EN 3339:2009

Overview

EN 3339:2006 is a CEN (ASD‑STAN) aerospace materials standard that specifies requirements for aluminium alloy AL‑P7010 in T76 temper supplied as die forgings with the maximum dimension a ≤ 200 mm. It defines chemical limits, heat treatment/delivery condition (T76), mechanical properties, fracture toughness, inspection and testing requirements specific to aerospace applications.

Key topics and requirements

• Material and form
  • Aluminium alloy: AL‑P7010 in T76 condition.
  • Form: Die forgings, maximum characteristic dimension a ≤ 200 mm.
• Chemical composition
  • Limits for alloying elements (e.g., Cu, Mg, Zn, Zr) and minimum aluminium content as given in the standard.
• Heat treatment / delivery condition
  • Specifies solution treatment and quench plus ageing sequences for T76; includes an alternative single‑stage artificial ageing option (see note b).
  • Notes constraints on quenchants and quench temperature to be agreed between manufacturer and purchaser.
• Mechanical properties
  • Proof stress (Rp0.2), tensile strength (Rm) and elongation (A%) are tabulated by part size (a ranges) and test direction (L, LT, ST). Values vary with dimension and direction (e.g., Rp0.2 values from ≈470 MPa down to ≈390 MPa; Rm from ≈530 MPa down to ≈450 MPa; elongation requirements depend on size and direction).
• Fracture toughness
  • K1C minimums are specified for L–T, T–L and S–L orientations and vary with part size (examples: L–T ≥ 25 MPa·m^0.5 for many size classes).
• Inspection and tests
  • References EN 2082‑3 for production testing, dimensional and marking inspection.
  • Stress‑corrosion susceptibility per EN 4527, electrical conductivity acceptance criteria, macrostructure and internal defect limits, batch uniformity and product qualification are covered or referenced.
• Notes
  • Patent rights caution; product qualification programme to be agreed between manufacturer and purchaser.

Applications and intended users

• Practical applications: structural and highly stressed aerospace components where high strength, fracture toughness and controlled corrosion performance of aluminium forgings are required.
• Who uses this standard:
  • Aerospace materials engineers and designers specifying AL‑P7010‑T76 forgings.
  • Forging manufacturers and heat‑treatment suppliers producing die forgings a ≤ 200 mm.
  • Quality, inspection and procurement teams verifying compliance with aerospace material specifications.
  • Certification bodies and testing laboratories performing mechanical and corrosion testing.

Related standards

• EN 2082‑3 - Aerospace aluminium forgings: pre‑production and production forgings (testing and technical specification).
• EN 4287 - Forging stock for AL‑P7010.
• EN 4258 / EN 4500‑2 - Organization and drafting rules for aerospace metallic material standards.
• EN 4527 - Stress‑corrosion cracking test methods (referenced for susceptibility testing).

Keywords: EN 3339, AL‑P7010‑T76, aluminium alloy, aerospace forgings, die forgings, T76 temper, mechanical properties, fracture toughness, heat treatment, CEN standard.