SIST EN 2502:2020

Aerospace series - Steel X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1 080 MPa - Bars

This document specifies the requirements relating to:
Steel X5CrNoMoCuNb14-5 (1.4594)
930 MPa ≤ Rm ≤ 1 080 MPa
Bars
De ≤ 150 mm
for aerospace applications.
ASD-STAN designation: FE-PM66.

Luft- und Raumfahrt - Stahl Acier X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1 080 MPa - Stangen - De ≤ 150 mm

Dieses Dokument legt die Anforderungen an:
Stahl X5CrNoMoCuNb14-5 (1.4594)
930 MPa ≤ Rm ≤ 1 080 MPa
Stangen
De ≤ 150 mm
für Anwendungen in der Luft- und Raumfahrt fest.
ASD-STAN-Bezeichnung: FE-PM66.

Série aérospatiale - Acier X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1 080 MPa - Barres

Le présent document spécifie les exigences relatives à :
Acier X5CrNoMoCuNb14-5 (1.4594)
930 MPa ≤ Rm ≤ 1 080 MPa
Barres
De ≤ 150 mm
pour applications aérospatiales.
Désignation ASD-STAN : FE-PM66.

Aeronavtika - Jeklo X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1080 MPa - Palice

Ta dokument določa zahteve, ki se navezujejo na: jeklo X5CrNoMoCuNb14-5 (1.4594), 930 MPa ≤ Rm ≤ 1080 MPa, palice, De ≤ 150 mm.

General Information

• Status: Published
• Publication Date: 16-Dec-2019
• 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: 12-Dec-2019
• Due Date: 16-Feb-2020
• Completion Date: 17-Dec-2019
• Ref Project: EN 2502:2019 - Aerospace series - Steel X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1 080 MPa - Bars - De ≤ 150 mm

Overview

SIST EN 2502:2020 is a European standard issued by CEN that specifies the requirements for aerospace-grade steel bars made of X5CrNoMoCuNb14-5 (1.4594). This stainless steel grade is characterized by its high tensile strength ranging from 930 MPa to 1080 MPa and is available in bar forms with diameters up to 150 mm. It is part of the aerospace series of metallic materials, ensuring consistent quality and performance tailored for aerospace applications.

The standard was developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) and harmonizes key chemical, mechanical, and dimensional properties to meet stringent aerospace requirements. It defines a comprehensive framework for producers and purchasers to ensure reliability, safety, and compatibility in aerospace component manufacturing.

Key Topics

• Material Specification
  Steel grade X5CrNoMoCuNb14-5 (1.4594) is a precipitation hardening stainless steel with a precise chemical composition:

  • Chromium (Cr): 13.2% to 14.7%
  • Molybdenum (Mo): 1.2% to 2.0%
  • Nickel (Ni): 5.0% to 5.8%
  • Niobium (Nb): 0.10% to 0.40%
  • Copper (Cu): 1.2% to 2.0%
    Other elements such as Carbon, Silicon, Manganese, Phosphorus, and Sulfur are controlled to strict maximum levels.

• Mechanical Requirements

  • Tensile strength (Rm) between 930 MPa and 1080 MPa
  • Proof stress (Rp0.2) minimum 780 MPa
  • Elongation at break: minimum 15% for standard condition, and 10% for higher strength range
  • Hardness ranges defined between 277 and 429 HB depending on condition

• Heat Treatment and Delivery Conditions
  The bars undergo solution annealing, primary hardening, and precipitation hardening with specific temperature and time parameters:

  • Solution annealing: 1000°C to 1050°C, quenched in air
  • Precipitation hardening stages between 530°C and 760°C with air cooling

• Dimensional Tolerances
  The standard mandates compliance with aerospace-specific tolerance standards EN 2034 to EN 2042, covering round, hexagonal, rectangular, and square bars ensuring precise form and size accuracy.

• Testing and Quality Assurance
  Requirements include marking inspection, dimensional controls, and optional mechanical testing. A qualification program must be agreed upon between supplier and customer to guarantee material integrity.

Applications

SIST EN 2502:2020 steel bars are designed for aerospace industry use where high strength, corrosion resistance, and reliability are critical. Typical applications include:

• Structural components in aircraft and spacecraft
• Engine parts requiring high mechanical performance and durability
• Landing gear and airframe assemblies demanding consistent material properties
• Precision components in defense and aerospace manufacturing

The steel's combination of toughness, heat resistance, and high strength makes it well-suited for demanding aerospace environments, ensuring safety and long-term operation under stress.

Related Standards

SIST EN 2502:2020 is part of a comprehensive set of aerospace metallic material standards, providing a consistent approach to material selection and quality:

• EN 4258 – General organization of aerospace metallic material standards
• EN 4700-002 – Technical specifications for aerospace series steel and heat resisting alloys
• EN 2034 to EN 2042 – Dimensional and tolerance standards for various bar forms (round, hexagonal, rectangular, square)
• EN 4500-005 – Rules for drafting and presenting steel material standards in aerospace

These related standards collectively support manufacturers and engineers in selecting, testing, and applying suitable materials for aerospace components, ensuring interoperability and compliance across the industry.

---

By adhering to SIST EN 2502:2020, aerospace manufacturers can assure superior quality and performance of steel bars meeting rigorous aerospace demands, optimizing safety and structural integrity in aerospace designs.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2020
Aeronavtika - Jeklo X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1080 MPa -
Palice
Aerospace series - Steel X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1 080 MPa -
Bars
Luft- und Raumfahrt - Stahl Acier X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1
080 MPa - Stangen - De ≤ 150 mm
Série aérospatiale - Acier X5CrNoMoCuNb14-5 (1.4594) - 930 MPa ≤ Rm ≤ 1 080 MPa -
Barres
Ta slovenski standard je istoveten z: EN 2502:2019
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 2502
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2019
EUROPÄISCHE NORM
ICS 49.025.10
English Version
Aerospace series - Steel X5CrNoMoCuNb14-5 (1.4594) -
930 MPa ≤ Rm ≤ 1 080 MPa - Bars
Série aérospatiale - Acier X5CrNoMoCuNb14-5 Luft- und Raumfahrt - Stahl Acier X5CrNoMoCuNb14-5
(1.4594) - 930 MPa ≤ Rm ≤ 1 080 MPa - Barres (1.4594) - 930 MPa ≤ Rm ≤ 1 080 MPa - Stangen - De ≤
150 mm
This European Standard was approved by CEN on 4 February 2019.
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, Turkey 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2502:2019 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 . 8

European foreword
This document (EN 2502:2019) has been prepared by the Aerospace and Defence Industries Association of
Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
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 June 2020, and conflicting national standards shall be withdrawn at the latest by
June 2020.
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.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: 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, Slovak
...