EN 4465:2007

Overview

EN 4465:2007 is a European standard developed by CEN that specifies the technical requirements for Steel FE-PM1506 (X5CrNiMoAl13-8-2), tailored specifically for aerospace applications. This high-performance steel grade is vacuum induction melted and consumable electrode remelted, ensuring superior metallurgical quality and consistency. The material is supplied as forgings with dimensions (a or diameter) up to 150 mm and satisfies a minimum tensile strength (Rm) of 1300 MPa.

This standard ensures that the steel meets stringent aerospace quality and safety criteria through specific heat treatments including solution treatment and precipitation treatment. EN 4465:2007 is part of a wider aerospace metallic materials series, organized under EN 4258, and follows guidelines outlined in EN 4500-5 for steel standard preparation.

Key Topics

• Material Composition: Defines the precise chemical makeup of Steel FE-PM1506, including chromium, nickel, molybdenum, aluminum, and other elemental limits, optimized for aerospace-grade corrosion resistance and mechanical performance.
• Melting and Production Methods:
  • Vacuum induction melting to reduce impurities and improve homogeneity.
  • Consumable electrode remelting for enhanced steel cleanliness.
  • Forgings made from controlled forging stock as per EN 4347.
• Dimensions and Form: Forgings with a thickness or diameter up to 150 mm (a or D ≤ 150 mm).
• Heat Treatment:
  • Solution treatment within 830 °C to 930 °C range followed by rapid cooling (oil, air, or water quench).
  • Precipitation aging between 530 °C to 550 °C for a minimum of 4 hours to achieve required mechanical properties.
• Mechanical Properties:
  • Minimum ultimate tensile strength (Rm) ≥ 1300 MPa.
  • Proof stress (Rp0.2) not less than 1200 MPa.
  • Specified elongation and reduction of area ensuring good ductility.
  • Hardness requirements between 363 HB and 380 HB depending on heat treatment.
• Testing and Inspection:
  • Comprehensive evaluation including grain size, external/internal defect inspection, batch uniformity, and dimensional checks in accordance with EN 4700-6.
  • Specific test sample orientations for strength and impact resistance.
• Certification: Qualification programmes between manufacturers and purchasers ensure consistent compliance.

Applications

EN 4465 steel Grade FE-PM1506 is designed primarily for aerospace components requiring exceptional strength, corrosion resistance, and structural reliability. Typical applications include:

• Aerospace structural forgings in critical load-bearing parts.
• Engine components subjected to high thermal and mechanical stress.
• Landing gear parts where strength and toughness are critical.
• Safety-critical fasteners and fittings needing superior fatigue resistance.
• High-performance aerospace assemblies demanding uniform material properties and traceability.

The material’s qualification under this standard guarantees its suitability for demanding environments encountered in aerospace and defense sectors.

Related Standards

• EN 4258: General organization of aerospace metallic material standards, providing a framework linking EN 4465 to other material specifications.
• EN 4347: Details specifications for similar steel forging stocks with larger dimensions.
• EN 4500-5: Rules for drafting and presenting steel material standards consistently.
• EN 4700-6: Technical specifications including pre-production and production forging guidelines aligned with EN 4465 requirements.

Conclusion

EN 4465:2007 provides a comprehensive and rigorous framework ensuring the quality, performance, and reliability of Steel FE-PM1506 forgings for aerospace use. Manufacturers and suppliers adhering to this standard deliver high-strength, precisely heat-treated, and defect-controlled steel components critical for modern aerospace engineering challenges. This standard is essential for aerospace engineers, metallurgists, and quality assurance professionals focusing on advanced steel materials for safety-critical aerospace applications.