SIST EN 4262:2014

Overview

EN 4262:2013 specifies requirements for the aerospace heat-resisting alloy FE‑PA4901 (X12CrNiCoMoW21‑20) in the as‑forged forging‑stock condition. Published by CEN/ASD‑STAN, the standard covers material designation, chemical composition, allowable dimensions (a or D ≤ 200 mm), delivery condition (as forged, code U) and mechanical properties for aerospace applications. It is part of the EN aerospace metallic materials series and links to general drafting and qualification rules.

Key topics and technical requirements

• Material designation: FE‑PA4901 (X12CrNiCoMoW21‑20), an alloyed heat‑resisting steel containing Cr, Ni, Co, Mo, W and other minor elements. Composition ranges are given in the standard (e.g., C 0.08–0.16%, Co ~18.5–21.0%, Cr ~20.0–22.5%, Ni ~19.0–21.0%, Mo ~2.5–3.5%, W ~2.0–3.0%; Fe balance).
• Form & production: Forging stock, produced by air melting, delivered as forged (no post‑delivery heat treatment required unless specified).
• Dimensions: Applicable to pieces with a or D ≤ 200 mm.
• Mechanical properties:
  • Tensile strength (Rm): 690 MPa ≤ Rm ≤ 880 MPa
  • Proof stress (Rp0.2): ≥ 305 MPa
  • Elongation (A): ≥ 35%
  • Hardness: ≤ 229 HB
• High‑temperature property: C‑temperature test at 815 °C with time tR ≥ 30 h; specified rupture stress σR = 125 MPa and elongation at rupture ≥ 10%.
• Quality & inspection: External/internal defect classes and macrostructure follow EN 2860‑2; sampling from forging stock; product qualification per EN 2043 agreed between manufacturer and purchaser.
• Delivery code: U (as forged). Heat treatment reference: solution treated option given per manufacturing schedule.

Applications and users

• Intended for aerospace components requiring high‑temperature strength and resistance (turbine parts, structural/engine forgings where heat resistance is critical).
• Primary users:
  • Aerospace materials engineers specifying forging stock and procurement teams.
  • Forging manufacturers and heat‑treatment specialists producing FE‑PA4901 components.
  • Quality assurance and inspection teams responsible for acceptance testing and certification.
  • Design engineers selecting materials for high‑temperature aerospace applications.

Practical value

• EN 4262:2013 gives clear, standardized mechanical and chemical limits to ensure interchangeability, predictable performance, and regulatory compliance for aerospace forgings. Using this standard reduces procurement risk and streamlines material qualification.

Related standards

• EN 2860‑2 - Forging stock and forgings technical specification
• EN 2043 - Semi‑finished product qualification programme
• EN 4258 - Organization of aerospace metallic standards
• EN 4500‑003 - Rules for drafting heat resisting alloy standards

Keywords: EN 4262:2013, FE‑PA4901, X12CrNiCoMoW21‑20, heat resisting alloy, aerospace forging stock, as forged, mechanical properties, forging specification