EN 3365:2025
(Main)Aerospace series - Steel X15CrNi17-3 (1.4057) - Air melted - Softened - Forging stock - a or D ≤ 300 mm
Aerospace series - Steel X15CrNi17-3 (1.4057) - Air melted - Softened - Forging stock - a or D ≤ 300 mm
This document specifies the requirements relating to:
Steel X15CrNi17-3 (1.4057)
Air melted
Softened
Forging stock
a or D ≤ 300 mm
for aerospace applications.
NOTE ASD-STAN designation: FE-PM3901
Material number: 1.4057
Luft- und Raumfahrt - Stahl X15CrNi17-3 (1.4057) - Lufterschmolzen - Weichgeglüht - Schmiedevormaterial - a oder D ≤ 300 mm
Dieses Dokument legt die Anforderungen an:
Stahl X15CrNi17 3 (1.4057)
Lufterschmolzen
Weichgeglüht
Schmiedevormaterial
a oder D ≤ 300 mm
für Anwendungen in der Luft- und Raumfahrt fest.
ASD-STAN-Bezeichnung: FE-PM3901
Werkstoffnummer: 1.4057
Série aérospatiale - Acier X15CrNi17-3 (1.4057) - Élaboré à l’air - Adouci - Produits destinés à la forge - a ou D ≤ 300 mm
Le présent document spécifie les exigences relatives à :
Acier X15CrNi17-3 (1.4057)
Élaboré à l’air
Adouci
Produits destinés à la forge
a ou D ≤ 300 mm
pour les applications aérospatiales.
Désignation ASD-STAN : FE-PM3901
Numéro de matériau : 1.4057
Aeronavtika - Jeklo X15CrNi17-3 (1.4057) - Taljeno - Mehčano - Material za kovanje - a ali D ≤ 300 mm
Ta dokument določa zahteve, ki se navezujejo na: jeklo X15CrNi17-3 (1.4057), taljeno, mehčano, material za kovanje, a ali D ≤ 300 mm za uporabo v aeronavtiki. OPOMBA: Oznaka ASD-STAN: FE-PM3901. Številka materiala: 1.4057.
General Information
- Status
- Published
- Publication Date
- 09-Sep-2025
- 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
- 10-Sep-2025
- Completion Date
- 10-Sep-2025
Relations
- Effective Date
- 22-May-2024
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3365:2025 is a European standard developed by the European Committee for Standardization (CEN) within the aerospace series. This standard specifies the requirements for steel X15CrNi17-3 (material number 1.4057) - an austenitic-martensitic stainless steel. The scope includes air melted, softened, forging stock material for aerospace applications, with cross-section or diameter (a or D) not exceeding 300 mm. The standard ensures consistent quality and performance of these forgings, supporting their safe and reliable use in aerospace manufacturing.
Key Topics
- Material Specification: EN 3365:2025 covers steel X15CrNi17-3, also designated ASD-STAN FE-PM3901, primarily intended for aerospace components requiring excellent mechanical properties and corrosion resistance.
- Melting and Delivery Condition: The steel must be air melted and supplied in a softened condition, which facilitates subsequent processing such as forging and heat treatment.
- Dimension Limits: The standard applies to forging stocks where the shortest cross-sectional dimension or diameter is 300 mm or less.
- Test Methods and Quality Control: It references EN 4700-005 for technical product specifications and includes requirements for ultrasonic and visual inspection, as well as limits on imperfection and inclusion content.
- Traceability and Consistency: The standard enforces marking, dimensional inspection, and delivery condition controls for robust traceability.
Applications
EN 3365:2025 is primarily used within the aerospace industry for the production of forged components such as:
- Aircraft structural parts
- Engine parts
- Landing gear components
- High-strength fasteners
The use of air melted, softened X15CrNi17-3 forging stock provides:
- Consistent quality for safety-critical aerospace parts
- Improved machinability during component manufacturing
- Excellent mechanical strength and good corrosion resistance suitable for demanding environments
Selecting materials that comply with EN 3365:2025 ensures alignment with recognized European aerospace quality standards, aids in supplier qualification, and supports international trade within the sector.
Related Standards
Organizations and engineers working to EN 3365:2025 may also reference related standards for broader compliance and process integration:
- EN 2043 - General requirements for qualification of metallic semi-finished products in aerospace applications.
- EN 4050-1 - Test method for ultrasonic inspection of metallic bars, plates, forging stock, and forgings.
- EN 4700-005 - Technical specification for steel and heat resisting alloys, specifically regarding wrought products and forging stocks.
- EN 4258 - General organization of metallic material standards and the links between different types of European standards for aerospace.
Practical Value
Adoption of EN 3365:2025 supports:
- Supplier consistency: Clear requirements for forging stock reduce variability between suppliers
- Safety assurance: Rigorous testing methods and material requirements help prevent in-service failures
- Regulatory compliance: Meeting CEN aerospace material standards is essential for certifications and quality management audits
- Competitive edge: Allows manufacturers to supply the European and global aerospace markets with certified, high-quality forging materials
By using EN 3365:2025-compliant steel forging stock, aerospace manufacturers and suppliers demonstrate commitment to quality, reliability, and industry best practices in their products and processes.
Get Certified
Connect with accredited certification bodies for this standard
BUREAU VERITAS Certification Germany
Bureau Veritas certification in Germany.
Element Materials Technology
Materials testing and product certification.
AQMS Ltd.
AQMS provides ISO certification to SMEs across the UK.
Sponsored listings
Frequently Asked Questions
EN 3365:2025 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Steel X15CrNi17-3 (1.4057) - Air melted - Softened - Forging stock - a or D ≤ 300 mm". This standard covers: This document specifies the requirements relating to: Steel X15CrNi17-3 (1.4057) Air melted Softened Forging stock a or D ≤ 300 mm for aerospace applications. NOTE ASD-STAN designation: FE-PM3901 Material number: 1.4057
This document specifies the requirements relating to: Steel X15CrNi17-3 (1.4057) Air melted Softened Forging stock a or D ≤ 300 mm for aerospace applications. NOTE ASD-STAN designation: FE-PM3901 Material number: 1.4057
EN 3365:2025 is classified under the following ICS (International Classification for Standards) categories: 49.025.10 - Steels. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3365:2025 has the following relationships with other standards: It is inter standard links to EN 3365:2007, EN 4050-1:2012, EN 2043:2013, EN 4700-005:2025, EN 4632-004:2012, EN 3491:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3365:2025 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2025
Aeronavtika - Jeklo X15CrNi17-3 (1.4057) - Taljeno - Mehčano - Material za kovanje
- a ali D ≤ 300 mm
Aerospace series - Steel X15CrNi17-3 (1.4057) - Air melted - Softened - Forging stock -
a or D ≤ 300 mm
Luft- und Raumfahrt - Stahl X15CrNi17-3 (1.4057) - Lufterschmolzen - Weichgeglüht -
Schmiedevormaterial - a oder D ≤ 300 mm
Série aérospatiale - Acier X15CrNi17-3 (1.4057) - Élaboré à l’air - Adouci - Produits
destinés à la forge - a ou D ≤ 300 mm
Ta slovenski standard je istoveten z: EN 3365:2025
ICS:
49.025.10 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 3365
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 49.025.10 Supersedes EN 3365:2007
English Version
Aerospace series - Steel X15CrNi17-3 (1.4057) - Air melted
- Softened - Forging stock - a or D 300 mm
Série aérospatiale - Acier X15CrNi17-3 (1.4057) - Luft- und Raumfahrt - Stahl X15CrNi17-3 (1.4057) -
Élaboré à l'air - Adouci - Produits destinés à la forge - a Lufterschmolzen - Weichgeglüht -
ou D 300 mm Schmiedevormaterial - a oder D 300 mm
This European Standard was approved by CEN on 18 August 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 NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
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 3365:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 5
Bibliography . 9
European foreword
This document (EN 3365:2025) 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 March 2026, and conflicting national standards shall be withdrawn
at the latest by March 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 3365:2007.
This document includes the following significant technical changes with respect to EN 3365:2007:
— EN 3365 (P2), 07/2007 – Update of the material designation, correction of the format of Table 1 to
comply with the requirements of the EN 4500 series, upda
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...