SIST EN 2450:2026
(Main)Aerospace series - Steel 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Bars - De ≤ 40 mm
Aerospace series - Steel 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Bars - De ≤ 40 mm
This document specifies the requirements relating to:
Steel 31NiMoCr10-5-3
1 230 MPa ≤ Rm ≤ 1 420 MPa
Bars
De ≤ 40 mm
for aerospace applications.
ASD-STAN designation: FE-PL73.
Luft- und Raumfahrt - Stahl 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Stangen - De ≤ 40 mm
No Scope available
Série aérospatiale - Acier 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Barres - De ≤ 40 mm
Le présent document spécifie les exigences relatives à :
Acier 31NiMoCr10-5-3
1 230 MPa ≤ Rm ≤ 1 420 MPa
Barres
De ≤ 40 mm
pour les applications aérospatiales.
Désignation ASD-STAN : FE-PL73.
Aeronavtika - Jeklo 31NiMoCr10-5-3 - 1230 MPa ≤ Rm ≤ 1420 MPa - Palice - De ≤ 40 mm
General Information
Relations
Overview
EN 2450:2025 - Aerospace series - Steel 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Bars - De ≤ 40 mm is a CEN/ASD‑STAN standard (ASD‑STAN designation: FE‑PL73) specifying material, mechanical and heat‑treatment requirements for low‑alloy steel bars used in aerospace applications. Published November 2025 (approved 5 October 2025), this standard applies to round, square, rectangular and hexagonal bars with a limiting dimension (De) up to 40 mm.
Key topics and technical requirements
- Material designation: Steel 31NiMoCr10‑5‑3 with defined chemical composition limits (C 0.27–0.35 %, Si 0.15–0.35 %, Mn 0.45–0.70 %, Cr 0.50–0.80 %, Mo 0.45–0.65 %, Ni 2.30–2.80 %, P ≤ 0.025 %, S ≤ 0.020 %).
- Melting method: Air melted.
- Delivery forms and limits: Bars, maximum dimension De ≤ 40 mm. Dimensional tolerance standards referenced (EN 2034–EN 2042 family).
- Heat treatment / delivery conditions:
- Softened (as applicable) or
- Hardened and tempered: austenitise 840 °C ≤ θ ≤ 860 °C / oil quench (OQ) then temper θ ≥ 520 °C.
- Mechanical properties:
- Tensile strength Rm: 1 230 ≤ Rm ≤ 1 420 MPa.
- Proof stress Rp0,2 (hardened): ≥ 1 080 MPa.
- Elongation A ≥ 9 %, reduction of area Z ≥ 40 %.
- Charpy impact (where specified): ≥ 20 J.
- Hardness limits: softened HB ≤ 248; hardened HB 363–415 (HV values given for De ≤ 5 mm).
- Hardenability (Jominy): minimum HRC values at specified distances (e.g., 6 mm → HRC ≥ 49; 40 mm → HRC ≥ 47).
- Testing & inspection: Requirements reference EN 4700‑002 for technical specifications and include marking and dimensional inspection.
Practical applications and users
EN 2450:2025 is intended for the aerospace supply chain where high‑strength, low‑alloy bars are required - typical users include:
- Material and bar manufacturers producing 31NiMoCr10‑5‑3 bars.
- Aerospace component designers and engineers specifying material properties for structural or high‑stress parts.
- Procurement and quality assurance teams requiring certified material and heat‑treatment records.
- Certification bodies and testing laboratories performing mechanical, hardness and Jominy tests.
Use cases include fasteners, shafts, landing‑gear subcomponents and other highly stressed small‑section parts where controlled hardenability and high tensile strength (Rm) are critical.
Related standards
- EN 4700‑002 (technical specification for wrought bars and sections)
- EN 2034–EN 2042 (dimensional and tolerance standards for bars)
- EN 4258 (organization of aerospace metallic material standards)
- EN 4500‑005 (rules for drafting steel material standards)
Keywords: EN 2450:2025, 31NiMoCr10‑5‑3, aerospace steel bars, 1 230 MPa ≤ Rm ≤ 1 420 MPa, De ≤ 40 mm, ASD‑STAN FE‑PL73, heat treatment, Jominy hardenability.
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2026
Aeronavtika - Jeklo 31NiMoCr10-5-3 - 1230 MPa ≤ Rm ≤ 1420 MPa - Palice - De ≤ 40
mm
Aerospace series - Steel 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Bars - De ≤
40 mm
Luft- und Raumfahrt - Stahl 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Stangen -
De ≤ 40 mm
Série aérospatiale - Acier 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Barres - De
≤ 40 mm
Ta slovenski standard je istoveten z: EN 2450:2025
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 2450
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2025
EUROPÄISCHE NORM
ICS 49.025.10 Supersedes EN 2450:2018
English Version
Aerospace series - Steel 31NiMoCr10-5-3 - 1 230 MPa ≤
Rm ≤ 1 420 MPa - Bars - De ≤ 40 mm
Série aérospatiale - Acier 31NiMoCr10-5-3 - 1 230 MPa Luft- und Raumfahrt - Stahl 31NiMoCr10-5-3 - 1 230
≤ Rm ≤ 1 420 MPa - Barres - De ≤ 40 mm MPa ≤ Rm ≤ 1 420 MPa - Stangen - De ≤ 40 mm
This European Standard was approved by CEN on 5 October 2025.
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 NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2450:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements . 6
Bibliography . 10
European foreword
This document (EN 2450:2025) 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 May 2026, and conflicting national standards shall be withdrawn at
the latest by May 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 2450:2018.
— update of Clause 2; and
— addition of a bibliography.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this document: Austria, Belgium, Bulgaria, Croatia, Cyprus,
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
...
Frequently Asked Questions
SIST EN 2450:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Steel 31NiMoCr10-5-3 - 1 230 MPa ≤ Rm ≤ 1 420 MPa - Bars - De ≤ 40 mm". This standard covers: This document specifies the requirements relating to: Steel 31NiMoCr10-5-3 1 230 MPa ≤ Rm ≤ 1 420 MPa Bars De ≤ 40 mm for aerospace applications. ASD-STAN designation: FE-PL73.
This document specifies the requirements relating to: Steel 31NiMoCr10-5-3 1 230 MPa ≤ Rm ≤ 1 420 MPa Bars De ≤ 40 mm for aerospace applications. ASD-STAN designation: FE-PL73.
SIST EN 2450:2026 is classified under the following ICS (International Classification for Standards) categories: 49.025.10 - Steels; 77.140.60 - Steel bars and rods. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 2450:2026 has the following relationships with other standards: It is inter standard links to SIST EN 2450:2019. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase SIST EN 2450:2026 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of SIST standards.
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