SIST EN 3161:2026

• Abstract:

  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.

• Status: Published
• Public Enquiry End Date: 04-Sep-2024
• Publication Date: 17-Jun-2026
• ICS: 49.025.10 - Steels
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-Jun-2026
• Due Date: 15-Aug-2026
• Completion Date: 18-Jun-2026
• Ref Project: EN 3161:2026 - Aerospace series - Steel X5CrNiCu17-4 (1.4542) - Air melted - Solution treated and precipitation treated - Bars - a or D ≤ 200 mm - Rm ≥ 930 MPa

• Refers: SIST EN 2043:2014 - Aerospace series - Metallic materials - General requirements for semi-finished product qualification (excluding forgings and castings)
• Effective Date: 02-Sep-2026
• Refers: SIST EN 4700-002:2026 - Aerospace series - Steel and heat-resisting alloys - Wrought products - Technical specification - Part 002: Bars and sections
• Effective Date: 02-Sep-2026
• Referred By: SIST EN 4614:2009 - Aerospace series - Spherical plain bearings in corrosion resisting steel with self-lubricating liner, wide series - Dimensions and loads - Inch series
• Effective Date: 27-May-2026
• Referred By: SIST EN 4854-1:2020 - Aerospace series - Bearing, spherical plain, in corrosion resisting steel with self-lubricating liner, low starting torque and low friction coefficient, elevated duty cycles under low oscillations at different operating conditions, narrow series - Part 1: Dimensions and loads for narrow series
• Effective Date: 27-May-2026
• Referred By: SIST EN 4613:2021 - Aerospace series - Spherical plain bearing in corrosion resisting steel with self-lubricating liner, narrow series - Dimensions and loads - Inch series
• Effective Date: 27-May-2026
• Referred By: SIST EN 4538-003:2011 - Aerospace series - Bearings, spherical plain, in corrosion resisting steel with self-lubricating liner elevated load under low oscillations - Narrow series - Dimensions and loads - Part 003: Inch series with low friction coefficient
• Effective Date: 27-May-2026
• Referred By: SIST EN 4632-004:2014 - Aerospace series - Weldability and brazeability of materials in aerospace constructions - Part 004: Welding and brazing of homogeneous assemblies of high alloyed steels
• Effective Date: 27-May-2026
• Referred By: SIST EN 6029:2017 - Aerospace series - Rod-ends, adjustable, single fork with UNJ threaded shank min. engagement: 1,5 x thread diameter in corrosion resisting steel - Dimensions and loads - Inch series
• Effective Date: 27-May-2026
• Referred By: SIST EN 4265:2014 - Aerospace series - Bearing spherical plain, metal to metal in corrosion resisting steel - Wide series - Dimensions and loads - Inch series
• Effective Date: 27-May-2026
• Referred By: SIST EN 4854-2:2020 - Aerospace series - Bearing, spherical plain, in corrosion resisting steel with self-lubricating liner, low starting torque and low friction coefficient, elevated duty cycles under low oscillations at different operating conditions, wide series - Part 2: Dimensions and loads
• Effective Date: 27-May-2026
• Referred By: SIST EN 4614:2021 - Aerospace series - Spherical plain bearing in corrosion resisting steel with self-lubricating liner, wide series - Dimensions and loads - Inch series
• Effective Date: 27-May-2026
• Referred By: SIST EN 4040:2009 - Aerospace series - Bearings, spherical plain in corrosion resisting steel with self-lubricating liner with wide inner ring - Elevated loads at ambient temperature - Dimensions and loads
• Effective Date: 27-May-2026
• Referred By: SIST EN 2287:2022 - Aerospace series - Bush, plain, in corrosion resisting steel with self-lubricating liner - Dimensions and loads
• Effective Date: 27-May-2026
• Referred By: SIST EN 2584:2019 - Aerospace series - Bearings, spherical plain in corrosion resisting steel with self-lubricating liner - Narrow series - Elevated load at ambient temperature - Dimensions and loads
• Effective Date: 27-May-2026
• Referred By: SIST EN 4266:2014 - Aerospace series - Bearing spherical plain, metal to metal, in corrosion resisting steel, cadmium plated - Wide series - Dimensions and loads - Inch series
• Effective Date: 27-May-2026

SIST EN 3161:2026 is the Slovenian adoption of EN 3161:2026, published by SIST and prepared within the CEN aerospace material series. It specifies requirements for air melted, solution treated and precipitation treated steel bars of X5CrNiCu17-4 (1.4542) with a or D ≤ 200 mm and Rm ≥ 930 MPa. The standard is used for aerospace applications where the steel designation, processing condition, dimensions and acceptance checks must be controlled.

What does SIST EN 3161:2026 specify?

SIST EN 3161:2026 specifies the requirements for one aerospace steel product: X5CrNiCu17-4 (1.4542) bars, air melted, solution treated and precipitation treated, in the size range a or D ≤ 200 mm. It is organized into a short document with Clauses 1 to 4 and a bibliography, and Clause 4 points to Table 1 as the central requirements table.

Clause 1 gives the scope and identifies the material by designation, W.nr 1.4542 and ASD-STAN FE-PM3801. Clause 2 lists the documents that become requirements when referenced. Clause 3 has no terms and definitions, and Clause 4 collects the technical requirements in Table 1.

What are the key requirements of SIST EN 3161:2026?

SIST EN 3161:2026 uses Table 1 to define the material, the processing route, the acceptance properties and the inspection checks. For a supplier, this means the product has to match the table across chemistry, heat treatment, mechanical properties and verification methods. For a buyer, it is the checklist for specifying and accepting the bar product.

Material identification and product form

The standard applies to steel X5CrNiCu17-4 (1.4542) in bar form, with the stated size limit a or D ≤ 200 mm, and for aerospace use. This matters because it fixes the exact product family and the dimensions covered by the specification.

Chemical composition and melting route

Table 1 gives the chemical composition limits for the alloying elements and requires air melted steel. In practice, this tells the manufacturer what melt route and chemistry window the material must meet before any further processing.

Heat treatment and delivery condition

The standard requires solution treatment and precipitation treatment, with the delivery condition and heat treatment shown in Table 1. This matters because the final properties depend on the thermal cycle, so the producer has to control temperature, holding time and cooling route and document them.

Mechanical properties and test directions

Table 1 assigns minimum mechanical properties such as proof stress, tensile strength, elongation, reduction of area and hardness, with values shown by size range and test direction. For users, this means the bar is not accepted on chemistry alone - the delivered condition must also achieve the listed performance in testing.

Microstructure, grain size and internal quality

The standard includes requirements for microstructure, grain size, external imperfections, inclusion content and internal imperfections. Table 1 also refers to EN 4436 for δ ferrite content, which shall not exceed 5%. In practice, this is the part that limits metallurgical anomalies and visible or internal flaws that could affect aerospace service.

Inspection and qualification

Table 1 refers to visual testing (VT), ultrasonic testing (UT), dimensional inspection and marking inspection, and it links product qualification to EN 2043. The qualification programme is to be agreed between manufacturer and purchaser, so the standard supports controlled approval rather than a loose supply arrangement.

Who uses SIST EN 3161:2026?

SIST EN 3161:2026 is used by aerospace material producers, bar suppliers, heat-treatment operations, purchasers and quality teams that need a controlled specification for stainless steel bars. It is also used by inspection and test laboratories that perform VT, UT, dimensional checks and property testing. The mention of manufacturer and purchaser in product qualification shows that it is relevant both to supply contracts and to acceptance testing.

What changed in SIST EN 3161:2026 from the previous edition?

SIST EN 3161:2026 supersedes EN 3161:2007. The documented technical changes are an updated material designation, a corrected Table 1 format to align with the EN 4500 series, an updated Clause 2, the addition of a bibliography, and a change in Table 1 from “a or D ≤ 150” to “a or D ≤ 200”.

Which standards are used with SIST EN 3161:2026?

The following referenced and companion standards are named in the document:

• EN 2043 - gives the qualification requirements for semi-finished products, excluding forgings and castings.
• EN 4436 - gives the test method for determining δ ferrite content.
• EN 4700-002 - gives the technical specification for wrought bars and sections.
• EN 4258 - describes the general organization of the aerospace metallic material standards series.
• EN 4500-005 - gives the drafting and presentation rules used for steel material standards.

What does the SIST EN 3161:2026 document contain?

SIST EN 3161:2026 is built around Table 1, which gathers the technical requirements in one place. The table covers chemical composition, melting method, form, size limit, delivery condition, heat treatment, mechanical properties, microstructure, grain size, external and internal imperfections, marking inspection, dimensional inspection and product qualification.

It also identifies the test methods and checks tied to those requirements, including VT, UT and the δ ferrite method from EN 4436. For a buyer or supplier, this makes the document a practical specification for ordering, making, testing and accepting aerospace bars.

SLOVENSKI STANDARD
01-julij-2026
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: EN 3161:2026
ICS:
49.025.10 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3161
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2026
EUROPÄISCHE NORM
ICS 49.025.10 Supersedes 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
ou D  200 mm - Rm  930 MPa ausscheidungsgehärtet - Stangen - a oder D  200 mm -
Rm  930 MPa
This European Standard was approved by CEN on 13 April 2026.

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, Türkiye 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3161:2026 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 . 9

European foreword
This document (EN 3161:2026) 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 shall be given the status of a national standard, either by publication of an identical text
or by endorsement, at the latest by November 2026, and conflicting national standards shall be
withdrawn at the latest by November 2026.
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.
This document supersedes EN 3161:2007.
— update of the material designation;
— correction of the format of Table 1 to comply with the requirements of the EN 4500 series;
— update of Clause 2;
— addition of a bibliography;
— modification of Table 1, line 9, “a or D ≤ 150” with “a or D ≤ 200”.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bo
...