EN 2952:2019

Overview

EN 2952:2019 is a CEN (ASD-STAN) aerospace material standard that specifies requirements for the heat resisting alloy NI‑PH2601 in the form of bars for forged fasteners. It covers bars with diameter D ≤ 50 mm, supplied solution treated and cold worked, with required tensile strength Rm between 1 270 MPa and 1 550 MPa. The standard is intended for aerospace applications where high strength and heat resistance are critical.

Key topics and requirements

• Material designation: Heat resisting alloy NI‑PH2601.
• Form & size: Bar for forging fasteners, diameter D ≤ 50 mm.
• Mechanical property: Tensile strength Rm ≥ 1 270 MPa (upper range up to 1 550 MPa indicated).
• Heat treatment / delivery condition: Solution treated and cold worked; delivery condition code U. Reference heat treatment is specified (e.g., solution treat at 995 °C for 1 h + precipitation treatment sequence).
• Chemical composition: Limits given for major elements (examples from the standard): Cr ~17.0–21.0%, Fe ~16.5–20.5%, along with controlled levels of C, Si, Mn, Al, B, Ti, Mo, Nb+Ta, Cu, Ni (base) and others. Exact element ranges are specified in the standard table.
• Melting method: Vacuum induction melted and consumable electrode remelted (vacuum or slag).
• Production: Cold worked, straightened and ground bars for forging; specific microstructure and grain size requirements referenced to EN 4700‑002.
• Inspection & testing: Includes non‑destructive penetrant testing (EN 2002‑016), macro/microstructure, internal defect classification (Class 5), marking and dimensional inspection; sampling and test-piece directions (L / LT) are defined. Notes on hardness vs tensile acceptance are included.

Applications and users

• Typical use is in aerospace forged fasteners where combination of high tensile strength and elevated temperature resistance is required (e.g., bolts, studs and high‑load fasteners after forging).
• Primary users:
  • Aerospace materials engineers and fastener manufacturers
  • Procurement and quality teams in aerospace OEMs and suppliers
  • Metallurgists and heat‑treatment specialists defining material acceptance criteria

Practical value

• Ensures consistent material chemistry, mechanical properties and processing for critical fastener feedstock.
• Facilitates supplier qualification, inspection routines and contractual specifications by providing a harmonized European reference for NI‑PH2601 bars.

Related standards

• EN 4700‑002 - Bar and section technical specification (wrought steels & heat resisting alloys)
• EN 4258 - Organization of aerospace metallic material standards
• EN 2002‑016 - NDT: Penetrant testing
• EN 4500‑003 - Rules for drafting heat resisting alloy standards

For procurement or design, reference EN 2952:2019 directly for precise tables, limits, test methods and the agreed qualification program between manufacturer and purchaser.