SIST EN 4464:2009

Overview

EN 4464:2007 (CEN) defines material and production requirements for the aerospace series steel FE-PM1506 (X5CrNiMoAl13-8-2). It covers vacuum induction melted (VIM) and consumable electrode remelted (CEM) material, supplied as forgings with maximum section a or D ≤ 150 mm and a minimum ultimate tensile strength Rm ≥ 1 200 MPa. The standard specifies chemical composition, melting route, heat treatments (solution and precipitation), mechanical property limits, testing references and acceptance criteria for aerospace applications.

Key topics and requirements

• Material designation: FE-PM1506 (X5CrNiMoAl13-8-2).
• Chemical composition (typical limits given):
  • C ≤ 0.05%, Si ≤ 0.10%, Mn ≤ 0.10%, P ≤ 0.010%, S ≤ 0.005%
  • Cr ≈ 12.25–13.25%, Mo ≈ 2.00–2.50%, Ni ≈ 7.50–8.50%, Al ≈ 0.8–1.10%, Ti ≈ 0.50%, N ≤ 0.010%
• Melting method: Vacuum induction melted and consumable electrode remelted to ensure low impurity levels and high cleanliness.
• Form and dimensions: Forgings (forged from forging stock per EN 4347), maximum section a or D ≤ 150 mm.
• Heat treatment:
  • Solution treatment: 820–860 °C followed by quench (OQ, AQ or WQ) to ≤ 20 °C.
  • Precipitation treatment (when required): 545–565 °C for ≥ 4 h (after solution treatment and quench).
• Mechanical properties (minimums/limits):
  • Proof stress Rp0.2 ≥ 1 100 MPa
  • Tensile strength Rm ≥ 1 200 MPa
  • Elongation A and reduction of area Z and Charpy impact minima specified for delivery/use conditions (e.g., A ≥ 10–12%, Z ≥ 45–50% depending on test direction and condition).
  • Hardness limits referenced (around 360 HB range) and impact energy requirements included for ambient and low-temperature conditions.
• Testing and inspection: Test sample and test-piece requirements follow EN 4700-6; grain size, internal/external defect classes, marking and dimensional inspection are referenced to EN 4700-6 and EN 4347.

Applications and users

EN 4464:2007 is intended for specification of high-strength aerospace forgings where strict chemical cleanliness, mechanical strength and heat-treatment control are required. Typical users include:

• Aerospace materials engineers and specification writers
• Forging manufacturers and heat-treatment processors
• Quality assurance and procurement teams for aerospace components
• Certification bodies and testing laboratories

Related standards

• EN 4258 (series organization for aerospace metallic materials)
• EN 4347 (forging stock and related FE-PM1506 soft condition)
• EN 4700-6 (pre-production and production forgings testing/specs)
• EN 4500-5 (rules for drafting steel material standards)

Keywords: EN 4464:2007, FE-PM1506, X5CrNiMoAl13-8-2, aerospace steel, vacuum induction melted, consumable electrode remelted, forgings, precipitation treated, Rm ≥ 1200 MPa.