FprEN 3161

Aerospace series - Steel X5CrNiCu17-4 (1.4542) - Air melted - Solution treated and precipitation treated - Bars - a or D ≤ 200 mm - Rm ≥ 930 MPa

This document specifies the requirements relating to:
Steel X5CrNiCu17-4 (1.4542)
Air melted
Solution treated and precipitation treated
Bars
a or D ≤ 200 mm
Rm ≥ 930 MPa
for aerospace applications.
W.nr: 1.4542.
ASD-STAN: FE-PM3801.

Luft- und Raumfahrt - Stahl X5CrNiCu17-4 (1.4542) - Lufterschmolzen - Lösungsgeglüht und ausgehärtet - Stangen - a oder D ≤ 200 mm - Rm ≥ 930 MPa

No Scope available

Série aérospatiale - Acier X5CrNiCu17-4 (1.4542) - Élaboré à l'air - Mis en solution et précipité - Barres - a ou D ≤ 200 mm - Rm ≥ 930 MPa

Le présent document spécifie les exigences relatives à :
Acier X5CrNiCu17-4 (1.4542)
Élaboré à l'air
Mis en solution et précipité
Barres
a ou D ≤ 200 mm
Rm ≥ 930 MPa
pour les applications aérospatiales.
W.nr : 1.4542.

Aeronavtika - Jeklo X5CrNiCu17-4 (1.4542) - Taljeno - Topilno žarjeno in izločevalno utrjeno - Palice - a ali D ≤ 200 mm - Rm ≥ 930 MPa

General Information

• Status: Not Published
• Publication Date: 14-Jun-2026
• ICS: 49.025.10 - Steels
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4/S 3 - Steels & Heat Resisting Alloys
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 12-Nov-2025
• Completion Date: 12-Nov-2025
• Ref Project: kSIST FprEN 3161:2025 - Aerospace series - Steel X5CrNiCu17-4 (1.4542) - Air melted - Solution treated and precipitation treated - Bars - a or D ≤ 200 mm - Rm ≥ 930 MPa

Relations

• Revises: EN 3161:2007 - Aerospace series - Steel FE-PM3801 (X5CrNiCu17-4) - Air melted, solution treated and precipitation treated, bar a or D ≤ 200 mm, Rm ≥ 930 MPa
• Effective Date: 18-Jan-2023

Overview

FprEN 3161 (prEN 3161:2024) is a CEN/ASD‑STAN draft standard for aerospace-grade steel X5CrNiCu17‑4 (W.nr. 1.4542). It defines requirements for air‑melted bars with nominal cross-section a or diameter D ≤ 200 mm that are solution treated and precipitation treated, and that deliver a minimum tensile strength Rm ≥ 930 MPa. The document is intended to supersede EN 3161:2007 and is part of the EN aerospace metallic materials series.

Key Topics and Requirements

• Material designation: X5CrNiCu17‑4 (1.4542), Fe = balance.
• Chemical composition (selected limits): C ≤ 0.07%, Si ≤ 1.00%, Mn ≤ 1.00%, P ≤ 0.040%, S ≤ 0.030%, Cr 15.0–17.5%, Mo ≤ 0.50%, Ni ≤ 5.0%, Cu ≤ 5.0%, Nb+Ta ≤ 0.45%.
• Melting method: Air melted (specified).
• Forms and dimensions: Bars (a or D ≤ 200 mm). Mechanical property requirements are given by size ranges (e.g., a or D ≤ 75 mm; 75 < a or D ≤ 150 mm).
• Heat treatments / delivery conditions:
  • Solution treatment: 1 025 °C to 1 055 °C, t ≥ 30 min, air cool or oil quench, cool to ≤ 30 °C.
  • Precipitation (age) treatment: 610 °C to 630 °C, t ≥ 4 h, air cool.
  • Delivery condition codes: W (solution treated) and U (solution + precipitation treated).
• Mechanical properties:
  • Proof stress Rp0.2 ≥ 725 MPa (size-dependent).
  • Tensile strength Rm ≥ 930 MPa.
  • Elongation A% ≥ 10–14% (depending on section size).
  • Reduction of area Z% ≥ 35–50% (depending on size).
  • Hardness limits: overall HB ≤ 363; tighter HB ranges apply for certain diameters.
  • Impact: KV ≥ 40 J (notch direction T) where required.
• Microstructure and inspection:
  • δ‑ferrite ≤ 5% (per EN 4436).
  • Grain size G ≥ 4 (EN 4700‑002).
  • Inclusion category 2 and ultrasonic testing class 2; visual inspection per EN 4700‑002.
• Qualification: Product qualification per EN 2043; test pieces and sampling per EN 4700‑002.

Applications and Who Uses It

• Typical applications: High‑strength stainless steel bars for structural and mechanical aerospace components (shafts, landing gear parts, fasteners, and other load‑bearing parts where corrosion resistance and high strength are required).
• Primary users:
  • Aerospace material suppliers and steel producers (specification and production control).
  • OEMs and Tier‑1 manufacturers (material procurement and acceptance).
  • Design and structural engineers (material selection and specification for parts).
  • Quality assurance, testing laboratories, and certification bodies (inspection, testing, and qualification).
  • Purchasing and contract teams (commercial and contractual material requirements).

Related Standards

• EN 4700‑002 (technical specification for bars and sections)
• EN 4436 (δ‑ferrite determination)
• EN 2043 (product qualification)
• EN 4258 and EN 4500‑005 (organization and drafting rules for aerospace metallic material standards)

Keywords: FprEN 3161, EN 3161, X5CrNiCu17‑4, 1.4542, aerospace steel bars, solution treated, precipitation treated, air melted, Rm ≥ 930 MPa, ASD‑STAN, CEN.

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 3161:2024
01-september-2024
Nadomešča:
SIST EN 3161:2007
Aeronavtika - Jeklo X5CrNiCu17-4 (1.4542) - Taljeno - Topilno žarjeno in
izločevalno utrjeno - Palice - a ali D ≤ 200 mm - Rm ≥ 930 MPa
Aerospace series - Steel X5CrNiCu17-4 (1.4542) - Air melted - Solution treated and
precipitation treated - Bars - a or D ≤ 200 mm - Rm ≥ 930 MPa
Luft- und Raumfahrt - Stahl X5CrNiCu17-4 (1.4542) - Lufterschmolzen - Lösungsgeglüht
und ausgehärtet - Stangen - a oder D ≤ 200 mm - Rm ≥ 930 MPa
Série aérospatiale - Acier X5CrNiCu17-4 (1.4542) - Élaboré à l'air - Mis en solution et
précipité - Barres - a ou D ≤ 200 mm - Rm ≥ 930 MPa
Ta slovenski standard je istoveten z: prEN 3161
ICS:
49.025.10 Jekla Steels
oSIST prEN 3161:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 3161:2024
oSIST prEN 3161:2024
DRAFT
EUROPEAN STANDARD
prEN 3161
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2024
ICS 49.025.10 Will supersede EN 3161:2007
English Version
Aerospace series - Steel X5CrNiCu17-4 (1.4542) - Air
melted - Solution treated and precipitation treated - Bars -
a or D  200 mm - Rm  930 MPa
Série aérospatiale - Acier X5CrNiCu17-4 (1.4542) - Luft- und Raumfahrt - Stahl X5CrNiCu17-4 (1.4542) -
Élaboré à l'air - Mis en solution et précipité - Barres - a Lufterschmolzen - Lösungsgeglüht und ausgehärtet -
ou D  200 mm - Rm  930 MPa Stangen - a oder D  200 mm - Rm  930 MPa
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 3161:2024 E
worldwide for CEN national Members.

oSIST prEN 3161:2024
prEN 3161:2024 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 5
Bibliography . 9

oSIST prEN 3161:2024
prEN 3161:2024 (E)
European foreword
This document (prEN 3161:2024) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 3161:2007.
The main changes with respect to the previous edition are as follows:
— update of the material designation;
— corr
...