EN 4571:2020

Aerospace series - Heat resisting alloy X12CrNiCoMoW21-20 - Solution treated - Bars and sections - De ≤ 100 mm

This document specifies the requirements relating to:
Heat resisting alloy X12CrNiCoMoW21-20
Solution treated
Bars and sections
De ≤ 100 mm
for aerospace applications.
ASD-STAN Designation: FE-PA4901.

Luft- und Raumfahrt - Hochwarmfeste Legierung X12CrNiCoMoW21-20 - Lösungsgeglüht - Stangen und Profile - De ≤ 100 mm

Dieses Dokument legt die Anforderungen an:
Hochwarmfeste Legierung X12CrNiCoMoW21-20
Lösungsgeglüht
Stangen und Profile
De ≤ 100 mm
für Anwendungen in der Luft- und Raumfahrt fest.
ASD-STAN-Bezeichnung: FE-PA4901.

Série aérospatiale - Alliage résistant à chaud X12CrNiCoMoW21-20 - Mis en solution - Barres et profilés - De ≤ 100 mm

Le présent document spécifie les exigences relatives à :
Alliage résistant à chaud X12CrNiCoMoW21-20
Mis en solution
Barres et profilés
De ≤ 100 mm
pour applications aérospatiales.
Désignation ASD-STAN : FE-PA4901.

Aeronavtika - Toplotno odporna zlitina X12CrNiCoMoW21-20 - Topilno žarjena - Palice in profili - De ≤ 100 mm

General Information

• Status: Published
• Publication Date: 18-Feb-2020
• Withdrawal Date: 30-Aug-2020
• ICS: 49.025.05 - Ferrous alloys in general
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4/S 3 - Steels & Heat Resisting Alloys
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 19-Feb-2020
• Completion Date: 19-Feb-2020
• Ref Project: SIST EN 4571:2020 - Aerospace series - Heat resisting alloy X12CrNiCoMoW21-20 - Solution treated - Bars and sections - De ≤ 100 mm

Overview

EN 4571:2020 is a CEN (ASD‑STAN) aerospace material standard that specifies requirements for the heat resisting alloy X12CrNiCoMoW21-20 in the solution treated condition for bars and sections with a maximum external diameter (De) of ≤ 100 mm. ASD‑STAN designation: FE‑PA4901. The standard defines chemical composition, heat treatment, mechanical and creep/rupture properties, inspection and qualification references tailored for aerospace use.

Key topics and requirements

• Material and form
  • Alloy: X12CrNiCoMoW21-20 (heat resisting alloy)
  • Form: bars and sections, wrought
  • Maximum dimension: De ≤ 100 mm
  • Melting: air or vacuum melted
• Chemical composition (typical limits)
  • C: 0.08–0.16% | Si ≤ 1.00% | Mn ≤ 2.00% | P ≤ 0.020% | S ≤ 0.015%
  • Co: 18.5–21.0% | Cr: 20.0–22.5% | Ni: 19.0–21.0%
  • Mo: 2.50–3.50% | W: 2.00–3.00% | Nb: 0.75–1.25% | N: 0.10–0.20% | Cu ≤ 0.50%
  • Balance: Fe
• Delivery condition and heat treatment
  • Delivery condition: Solution treated (code U)
  • Heat treatment: 1100 °C to 1180 °C, t = 1 h, water quench (WQ)
• Mechanical properties
  • Proof stress Rp0.2 ≥ 305 MPa
  • Tensile strength Rm between 690 and 880 MPa
  • Elongation A ≥ 35%
  • Hardness HB ≤ 229
• Creep/rupture requirement
  • Test temperature: 730 °C
  • Time to rupture tR ≥ 23 h
  • Rupture stress σR = 220 MPa
  • Elongation at rupture ≥ 10%
• Inspection and quality
  • Grain size: G ≥ 4 for ≥ 95% area (per EN 4700‑002)
  • Non‑destructive and visual checks (UT class 4, VT, macrostructure) as referenced to EN 4700‑002
  • Product qualification per EN 2043; test samples and specimen directions per EN 4700‑002

Applications and users

• Relevant to aerospace manufacturers, material suppliers, heat treatment shops, quality assurance engineers, design engineers and procurement teams specifying high‑temperature components.
• Typical uses include hot‑section structural parts, high temperature fasteners, shafts and sections in aerospace propulsion and thermal systems where heat resisting alloy performance, traceable composition and certified mechanical/creep properties are required.

Related standards

• EN 4700‑002 - Technical specification for wrought bars and sections (referenced for tests and specimen preparation)
• EN 2043 - Semi‑finished product qualification (aerospace series)
• EN 4258, EN 4500‑003 - Organization and drafting rules for aerospace metallic material standards

This standard ensures consistent material chemistry, heat treatment and mechanical/creep performance for X12CrNiCoMoW21-20 bars and sections used in critical aerospace high‑temperature applications.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2020
Aeronavtika - Toplotno odporna zlitina X12CrNiCoMoW21-20 - Topilno žarjena -
Palice in profili - De ≤ 100 mm
Aerospace series - Heat resisting alloy X12CrNiCoMoW21-20 - Solution treated - Bars
and sections - De ≤ 100 mm
Luft- und Raumfahrt - Hochwarmfeste Legierung X12CrNiCoMoW21-20 -
Lösungsgeglüht - Stangen und Profile - De ≤ 100 mm
Série aérospatiale - Alliage résistant à chaud X12CrNiCoMoW21-20 - Mis en solution -
Barres et profilés - De ≤ 100 mm
Ta slovenski standard je istoveten z: EN 4571:2020
ICS:
49.025.05 Železove zlitine na splošno Ferrous alloys in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4571
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 49.025.05
English Version
Aerospace series - Heat resisting alloy X12CrNiCoMoW21-
20 - Solution treated - Bars and sections - De ≤ 100 mm
Série aérospatiale - Alliage résistant à chaud Luft- und Raumfahrt - Hochwarmfeste Legierung
X12CrNiCoMoW21-20 - Mis en solution - Barres et X12CrNiCoMoW21-20 - Lösungsgeglüht - Stangen und
profilés - De ≤ 100 mm Profile - De ≤ 100 mm
This European Standard was approved by CEN on 8 December 2019.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4571:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 5
Bibliography . 8

European foreword
This document (EN 4571:2020) has been prepared by the Aerospace and Defence Industries Association
of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
ASD, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2020, and conflicting national standards shall be
withdrawn at the latest by August 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
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