SIST EN 3160:2026

• 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 ≥ 1 310 MPa; for aerospace applications.; W.nr: 1.4542.; ASD-STAN: FE-PM3801.

• Status: Published
• Public Enquiry End Date: 04-Sep-2024
• Publication Date: 15-Jun-2026
• ICS: 49.025.10 - Steels
• ICS: 77.140.60 - Steel bars and rods
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 09-Jun-2026
• Due Date: 14-Aug-2026
• Completion Date: 16-Jun-2026
• Ref Project: EN 3160:2026 - Aerospace series - Steel X5CrNiCu17-4 (1.4542) - Air melted - Solution treated and precipitation treated - Bars - a or D ≤ 200 mm - Rm ≥ 1 310 MPa

• 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
• 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
• 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
• Revised: SIST EN 3160:2007 - Aerospace series - Steel FE-PM3801 (X5CrNiCu17-4) - Air melted, solution treated and precipitation treated, bar a or D <= 200 mm, Rm >= 1 310 MPa
• Effective Date: 19-Jan-2023

SIST EN 3160:2026 is the Slovenian adoption of EN 3160:2026, a CEN aerospace material standard for steel X5CrNiCu17-4 (1.4542). It specifies requirements for air-melted, solution treated and precipitation treated bars with a or D ≤ 200 mm and Rm ≥ 1 310 MPa, for aerospace applications. In practice, it tells suppliers, purchasers and test labs which material condition, product size and verification methods apply.

What does SIST EN 3160:2026 specify?

SIST EN 3160:2026 specifies one aerospace bar product in one defined metallurgical condition. Clause 1 gives the scope: steel X5CrNiCu17-4 (1.4542), air melted, solution treated and precipitation treated, for bars with a or D ≤ 200 mm.

The document is organized into four clauses:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Terms and definitions
• Clause 4 - Requirements

Clause 4 is where the technical content sits. It points to Table 1, which brings together the material designation, composition, melting route, delivery condition, mechanical properties, inspection methods and product qualification requirements.

What are the key requirements of SIST EN 3160:2026?

SIST EN 3160:2026 is built around Table 1, which sets the material condition and the checks needed before release. For a buyer or quality manager, the important point is that compliance is not just about the alloy name - it also depends on heat treatment, size, test direction and acceptance criteria.

Material identity and delivery condition

The standard applies to steel X5CrNiCu17-4 (1.4542) produced by air melting and supplied as bars. Table 1 also fixes the delivery condition as solution treated or solution treated and precipitation treated, with defined heat-treatment routes and delivery condition codes.

In practice, this means the producer must control the full metallurgical state, not just chemistry. A purchase order or inspection plan should therefore name the exact condition required for the intended aerospace use.

Chemical and metallurgical control

Table 1 specifies the chemical composition limits for the alloying elements and impurity elements. It also includes microstructure control, grain size, external imperfections and inclusion content.

This matters because aerospace bars are often accepted only if the chemistry and internal quality stay within a narrow window. The document also links microstructure examination to EN 4436 and sets a δ-ferrite limit in the table notes.

Mechanical properties and test orientation

Table 1 gives proof stress, tensile strength, elongation, reduction of area and hardness requirements. The limits depend on the size range and on whether the test piece is taken in the L or T direction.

For a reader, this means the bar is not accepted on tensile strength alone. The manufacturer has to test the right orientation and size category, and the purchaser needs to match those conditions to the part design and load direction.

Inspection and qualification

Table 1 requires visual testing, ultrasonic testing, marking inspection and dimensional inspection, with methods taken from EN 4700-002. It also points to EN 2043 for product qualification, with the qualification programme agreed between manufacturer and purchaser.

In practice, this creates a controlled release route: confirm the product dimensions, inspect surface and internal quality, then agree qualification before regular supply.

What terms does SIST EN 3160:2026 define?

SIST EN 3160:2026 does not list separate terms and definitions in Clause 3, but it uses several key technical expressions in its requirements.

• Air melted - the steel is produced by an air-melting route, so the melting practice is part of the material identity.
• Solution treated - the bar has received a heat treatment intended to place the alloy in a solution-treated condition before further processing or use.
• Precipitation treated - the bar has received an additional ageing-type heat treatment to develop the specified properties.
• Bars - the product form covered by the standard; the requirements apply to bar stock, not forgings or castings.
• Proof stress Rp0,2 - the stress level used to assess resistance to permanent deformation in tensile testing.
• Tensile strength Rm - the maximum stress reached in a tensile test; here it is part of the required property set.
• UT - ultrasonic testing, used to check internal imperfections.
• VT - visual testing, used to check external imperfections.

Who uses SIST EN 3160:2026?

SIST EN 3160:2026 is used by aerospace material suppliers, heat-treatment shops, test laboratories, inspectors, buyers and quality managers. It is relevant when ordering, producing, testing or approving stainless steel bars for aerospace parts.

It helps engineers specify a suitable bar product, helps suppliers set up manufacture and inspection, and helps buyers verify that the delivered material matches the agreed aerospace condition.

What changed in SIST EN 3160:2026 from the previous edition?

SIST EN 3160:2026 supersedes EN 3160:2007. The foreword states these significant changes:

• updated material designation
• revised Table 1 format to match the EN 4500 series
• updated Clause 2
• added a bibliography
• changed the size limit in Table 1 from a or D ≤ 150 to a or D ≤ 200

Which standards are used with SIST EN 3160:2026?

The document relies on these referenced and companion standards:

• EN 2043 - product qualification for semi-finished metallic materials, used for the qualification programme
• EN 4436 - method for determining δ ferrite content
• EN 4700-002 - technical specification for wrought bars and sections, used for test samples, test pieces, grain size, imperfections, marking and dimensional inspection
• EN 4258 - explains the general organization of metallic material standards for aerospace applications
• EN 4500-005 - gives drafting and presentation rules for steel material standards

What does the SIST EN 3160:2026 document contain?

SIST EN 3160:2026 is a short material standard built around one main requirements table. Table 1 combines composition limits, heat treatment, delivery condition codes, size limits, mechanical properties and inspection criteria for the bar product.

The document also points to standard test and inspection methods for microstructure, ultrasonic testing, visual examination, marking and dimensions. For users, this means the standard is meant to be applied as a production-and-acceptance specification, not just as a material name.

SLOVENSKI STANDARD
01-julij-2026
Aeronavtika - Jeklo X5CrNiCu17-4 (1.4542) - Taljeno - Topilno žarjeno in
izločevalno utrjeno - Palice - a ali D ≤ 200 mm - Rm ≥ 1310 MPa
Aerospace series - Steel X5CrNiCu17-4 (1.4542) - Air melted - Solution treated and
precipitation treated - Bars - a or D ≤ 200 mm - Rm ≥ 1 310 MPa
Luft- und Raumfahrt - Stahl X5CrNiCu17-4 (1.4542) - Lufterschmolzen - Lösungsgeglüht
und ausgehärtet - Stangen - a oder D ≤ 200 mm - Rm ≥ 1 310 MPa
Série aérospatiale - Acier X5CrNiCu17-4 (1.4542) - Élaboré à l'air - Mis en solution et
précipité - Barres - a ou D ≤ 200 mm - Rm ≥ 1 310 MPa
Ta slovenski standard je istoveten z: EN 3160:2026
ICS:
49.025.10 Jekla Steels
77.140.60 Jeklene palice in drogovi Steel bars and rods
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3160
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2026
EUROPÄISCHE NORM
ICS 49.025.10 Supersedes EN 3160:2007
English Version
Aerospace series - Steel X5CrNiCu17-4 (1.4542) - Air
melted - Solution treated and precipitation treated - Bars -
a or D  200 mm - Rm  1 310 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  1 310 MPa ausscheidungsgehärtet - Stangen - a oder D  200 mm -
Rm  1 310 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,
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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 3160:2026 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 3160:2026) 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 3160:2007.
— 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 st
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