SIST EN 3476:2009

Overview

SIST EN 3476:2009 is a European standard developed by the European Committee for Standardization (CEN) that specifies the requirements for Steel FE-PL1501 (commonly known as 30CrMo12). This steel is air melted, softened, and intended for use as forging stock with dimensions where the smallest cross-sectional measure (a or diameter D) is less than or equal to 300 mm. This standard is part of the aerospace series dedicated to metallic materials used in aerospace applications, ensuring quality, consistency, and suitability for critical aerospace components.

Key Topics

• Material Designation
  Steel FE-PL1501 (30CrMo12) with a precise chemical composition:

  • Carbon (C): 0.28% minimum - 0.35% maximum
  • Silicon (Si): max 0.40%
  • Manganese (Mn): max 0.70%
  • Chromium (Cr): 2.80% - 3.30%
  • Molybdenum (Mo): 0.30% - 0.50%
  • Nickel (Ni): max 0.30%
  • Phosphorus (P) and Sulfur (S): controlled impurity levels for quality assurance

• Production Method
  Air melted steel, softened condition, forged stock.

• Dimensional Limits
  Applicable for forging stock with smallest cross sections or diameter a or D up to 300 mm.

• Mechanical Properties

  • Proof stress (Rp0.2): ≥ 850 MPa
  • Tensile strength (Rm): between 1050 and 1250 MPa
  • Elongation (A): ≥ 10%
  • Hardness: 277 HB maximum
  • Impact toughness: KV ≥ 35 Joules with test notch direction transverse (T) to forging direction

• Heat Treatment
  Reference hardened and tempered treatment at temperatures between 860°C and 920°C, followed by tempering above 560°C to achieve desired properties.

• Testing and Quality Control
  Conforms with related test methods including the Jominy end quench test for hardenability (EN 2003-14), ultrasonic inspection (EN 4050-1), and forging stock specifications (EN 2157-2).

Applications

SIST EN 3476:2009 steel FE-PL1501 is designed specifically for aerospace forging applications where high-performance steel is critical. Its strength, toughness, and dimensional control make it suitable for:

• Structural aerospace components subject to high mechanical loads
• Forged parts in aircraft engines and landing gear assemblies
• High-stress components requiring excellent fatigue resistance and toughness
• Aerospace manufacturing requiring certified materials compliant with international aerospace standards

The use of air melted, softened steel ensures reduced impurities and improved workability during forging processes, enabling reliable component fabrication meeting stringent aerospace safety and performance criteria.

Related Standards

• EN 4258 - Aerospace metallic materials standardization framework and general guidelines.
• EN 2157-2 - Technical specifications for steel forging stock used in aerospace.
• EN 2003-14 - Hardenability test methods for steel products (Jominy test).
• EN 4050-1 - Ultrasonic inspection of metallic bars and forgings ensuring internal integrity.
• EN 4500-5 - Rules for drafting and presenting standards for metallic aerospace materials.
• EN 2043 - General requirements for semi-finished products qualification (excluding forgings and castings).

Keywords: SIST EN 3476:2009, steel FE-PL1501, 30CrMo12, aerospace steel, forging stock, air melted steel, softened steel, aerospace forging standards, mechanical properties steel aerospace, CEN standards aerospace, steel hardenability, aerospace material qualification.