EN 2947:2006

Overview

EN 2947:2006 is a CEN aerospace series material standard that specifies requirements for Steel FE-PA3004 (X10CrNi18-09) supplied as air-melted, non heat-treated, cold-drawn wire with a or D ≤ 2,3 mm. The standard targets aerospace applications where high tensile strength, dimensional control and consistent testing protocols are essential.

This material standard is part of the EN aerospace metallic materials series and refers to general rules and qualification procedures in complementary EN documents.

Key Topics

• Material designation: Steel FE-PA3004 (X10CrNi18-09).
• Melting method: Air melted.
• Heat treatment / Delivery condition: Non heat treated (delivery code U).
• Form and production: Cold drawn wire, nominal wire dimension a or D ≤ 2,3 mm.
• Chemical composition (as given):
  • Carbon (C): min 0,05 % - max 0,15 %
  • Silicon (Si): max 1,5 %
  • Manganese (Mn): max 2,00 %
  • Phosphorus (P): max 0,035 %
  • Sulfur (S): max 0,015 %
  • Chromium (Cr): min 16,0 % - max 19,0 %
  • Molybdenum (Mo): max 0,75 %
  • Nickel (Ni): min 6,0 % - max 9,5 %
  • Copper (Cu): max 0,35 %
  • Iron (Fe): balance (base)
• Mechanical requirements (tensile strength Rm by diameter):
  • a or D ≤ 0,62 mm: Rm ≥ 1 750 MPa
  • 0,62 < a or D ≤ 0,81 mm: Rm ≥ 1 650 MPa
  • 0,81 < a or D ≤ 0,99 mm: Rm ≥ 1 550 MPa
  • 0,99 < a or D ≤ 1,11 mm: Rm ≥ 1 450 MPa
  • 1,11 < a or D ≤ 1,79 mm: Rm ≥ 1 350 MPa
  • 1,79 < a or D ≤ 2,30 mm: Rm ≥ 1 250 MPa
  • Proof stress Rp0,2 is specified between 0,80·Rm and 0,90·Rm (ambient test temperature, longitudinal test pieces).
• Testing and inspection: Mechanical and functional tests reference EN 4700-4 (wire specific tests such as reverse torsion, bending, wrapping), visual inspection for external defects, dimensional checks and marking requirements.

Applications

EN 2947:2006 targets aerospace components requiring high-strength, small-diameter wire. Typical uses cited in the standard include:

• Wire thread inserts
• High-performance springs

Practical benefits for design and procurement:

• Reliable tensile strength grades tied to wire diameter
• Traceable chemical limits for corrosion-resistant stainless steel (Cr–Ni alloy)
• Defined production and delivery conditions to ensure repeatable performance

Related Standards

• EN 4700-4 - Technical specification for wire (tests and sampling referenced).
• EN 2043 - General requirements for semi-finished product qualification.
• EN 4258 - Organization of aerospace metallic material standards.
• EN 4500-5 - Rules for drafting presentation of steel material standards.

For product qualification and procurement, the standard references EN 2043 and requires agreement between manufacturer and purchaser on qualification programmes. Use EN 2947:2006 when specifying FE-PA3004 cold-drawn wire for aerospace threaded inserts, springs and other high-strength small-diameter wire applications.