SIST EN 2478:2008

Overview

EN 2478:2008 is a CEN (ASD‑STAN) aerospace series standard that specifies requirements for steel FE-PL2107 (30NiCrMo16) in bar form with an external diameter (De) up to 40 mm. The standard targets high‑strength, low‑alloy steel bars intended for aerospace applications and defines chemical composition, delivery conditions, mechanical properties, heat treatment, inspection and testing requirements. Key searchable terms: EN 2478:2008, FE-PL2107, 30NiCrMo16, aerospace steel bars, high‑strength bars ≤ 40 mm.

Key topics and requirements

• Material designation: FE-PL2107 (30NiCrMo16).
• Chemical composition (typical limits):
  • C: 0.26–0.33%, Si: ≤0.40%, Mn: 0.20–0.60%, P ≤0.025%, S ≤0.020%, Cr: 1.20–1.50%, Mo: 0.30–0.60%, Ni: 3.30–4.30% (balance Fe).
• Mechanical properties:
  • Tensile strength (Rm): 1 220 MPa ≤ Rm ≤ 1 370 MPa
  • Proof stress (Rp0.2): ≥ 1 020 MPa (where applicable)
  • Elongation (A): ≥ 8%
  • Impact requirement: ≥ 25 (as specified in the standard)
• Hardness: Specified limits for annealed and hardened/tempered conditions (e.g., ranges reported as HB and HV with HV noted for De ≤ 5 mm).
• Delivery conditions:Annealed (A) and Hardened & tempered (U) with prescribed heat‑treatment ranges (e.g., 840–860 °C followed by OQ + tempering ≥ 525 °C as per the standard).
• Manufacture: Bars are air‑melted, produced and supplied to De ≤ 40 mm.
• Inspection & testing: Grain size, micro‑cleanliness (EN 2951 category 2), external/internal defect criteria, dimensional and marking inspections, and product qualification procedures.

Applications and users

• Intended for aerospace material selection where high tensile strength in bar form is required.
• Primary users: materials engineers, procurement specialists, quality/inspection teams, suppliers of aerospace metallic materials, and testing laboratories.
• Typical applications: selection/specification of low‑alloy, high‑strength bars for aerospace engineering parts and assemblies where standardized material performance, traceability and testing are required.

Related standards

• EN 4700‑2 (bar technical specification)
• EN 4258 (organization of aerospace metallic material standards)
• EN 4500‑5 (rules for drafting steel material standards)
• EN 2951 (micrographic determination of non‑metallic inclusions)
• EN 2034 / EN 2042 (dimensional tolerances for round and square bars)

EN 2478:2008 provides the chemical, mechanical and inspection framework necessary to specify and procure FE‑PL2107 (30NiCrMo16) bars (De ≤ 40 mm) for aerospace use, ensuring consistency, traceability and compliance across suppliers and manufacturers.