EN 4500-003:2026

• Abstract:

  The EN 4500 series specifies the rules for the drafting and presentation of metallic material standards for aerospace applications.; This Part 003 specifies the "Specific rules for heat resisting alloys".

• Status: Not Published
• Publication Date: 06-Oct-2026
• ICS: 01.120 - Standardization. General rules
• Technical Committee: ASD-STAN - Aerospace
• Current Stage: 6055 - CEN Ratification completed (DOR) - Publishing
• Start Date: 26-Jul-2026
• Completion Date: 26-Jul-2026
• Ref Project: kSIST FprEN 4500-003:2026 - Aerospace series - Metallic materials - Rules for drafting and presentation of material standards - Part 003: Specific rules for heat-resisting alloys

• Revises: EN 4500-003:2024 - Aerospace series - Metallic materials - Rules for drafting and presentation of material standards - Part 003: Specific rules for heat resisting alloys
• Effective Date: 11-Jun-2025

EN 4500-003:2026 is a CEN European Standard in the Aerospace series. It sets the rules for drafting and presenting metallic material standards for aerospace applications, with specific rules for heat-resisting alloys. It is used by the people who prepare, review, or apply those material standards so that the title, scope, references, Table 1, and annex examples are presented in the same way.

What does EN 4500-003:2026 specify?

EN 4500-003:2026 specifies the rules for drafting and presenting European standards for aerospace metallic materials, and Part 003 gives the specific rules for heat-resisting alloys. The document is a drafting aid, so its main purpose is to standardize how a material standard is written and organized.

The document is organized into clauses 1 to 4.6, followed by informative annexes A to E and a bibliography. Annexes A to E provide completion examples for the title page, introduction, scope and requirements, Table 1, and bibliography.

Annex	What it covers
A	Completion of title page
B	Completion of the introduction
C	Completion of scope, normative references, terms and definitions, and requirements
D	Completion of Table 1
E	Completion of the bibliography

What are the key requirements of EN 4500-003:2026?

EN 4500-003:2026 tells standards writers how to build a complete aerospace material standard for heat-resisting alloys. The key point is that the document standardizes the template and the wording, so different material standards can be read and applied in the same way.

Title, scope and structure

Clause 4.1 says the annex examples are only illustrations of the drafting rules and may not correspond to real standardized EN semi-finished products. That matters because the examples guide writing, but they are not a list of approved products.

Clause 4.2 controls the title. It gives the permitted wording for the method of melting, the product form, powder metallurgy terms, and additional information entries. In practice, this is how a standard title shows whether the product is vacuum melted, rolled, drawn, forged, cast, powder based, or intended for a use such as structural, pressure, rivets, fasteners, or welding.

Clause 4.3 points to Annex B for the introduction, and clause 4.4 points to Annex C for the scope, references, terms, definitions, and requirements. That means the document expects these front sections to be completed in a consistent template, not written ad hoc.

Table 1 and the material definition

Clause 4.5 is the core of the document. It sets out Table 1, which is the structure used to define the material standard line by line.

The table starts with material designation, chemical composition, and method of melting. For composition, clause 4.5.2 gives the order of presentation of elements, so the composition section reads in a predictable sequence and users can compare standards more easily.

Clause 4.5.9 adds line 5.2, which states the applicable dimensional standard. Clause 4.5.10 gives the allowed delivery condition and heat treatment terms, such as not heat treated, annealed, solution treated, precipitation treated, tempered, cold worked, hot isostatically pressed (hipped), descaled, machined, ground, as cast, and as forged. In practice, these lines tell the reader what condition the product is supplied in and what heat treatment history applies.

Clause 4.5.12 allows the use condition to repeat the delivery condition or to state delivery condition directly. Clause 4.5.17 says thickness of cladding on each face is not applicable to heat-resisting alloys. Clause 4.5.27 says line 27 is not used, and clause 4.5.30 says line 97 is not used.

Tests, inspection and qualification

Clauses 4.5.18 to 4.5.26 organize the property requirements, including tensile, hardness, shear strength, bending, impact strength, and creep. That matters because the resulting material standard has to state which properties are checked and under what conditions they are measured.

Clause 4.5.26 defines reference heat treatment, which is the heat-treatment condition used as the basis for the stated properties. Clause 4.5.28 and 4.5.29 cover marking inspection and dimensional inspection, so the standard can specify how the product is verified before delivery.

Clauses 4.5.31 to 4.5.33 cover notes, typical use, and product qualification. The qualification line is especially practical: Annex D shows that the qualification programme is agreed between manufacturer and purchaser, and that the exact route depends on whether the technical specification includes qualification requirements.

Clause 4.5.27 and the later lines from 30 to 94 are completed in accordance with EN 4500-001. Annex D shows how those lines are used for items such as microstructure, macrostructure, fatigue, fracture toughness, density, elastic modulus, internal imperfections, surface contamination, cleanliness of powder, and crack propagation.

What terms does EN 4500-003:2026 define?

EN 4500-003:2026 uses the terms and definitions from EN 4259 and EN 4500-001, and several recurring drafting terms are central to the document.

• Heat-resisting alloy - A metallic material covered by Part 003, used for aerospace applications where the standard must describe its form, condition, and qualification clearly.
• Delivery condition - The state in which the product is supplied, such as solution treated and precipitation treated, which matters because purchasers need the supplied condition, not only the alloy name.
• Reference heat treatment - The heat-treatment condition used as the reference for properties and testing, so results are tied to one agreed thermal history.
• Product qualification - The agreed qualification programme between manufacturer and purchaser, used to show that the product meets the technical specification.
• Dimensional standard - The standard named in line 5.2 that governs the product dimensions, so the material standard points to the correct dimensional document.
• Method of melting - The melting route named in the title and Table 1, such as vacuum melted or vacuum arc remelted, which is important because melt route affects material identity and acceptability.
• Use condition - The condition stated for intended use, which helps link the standard to how the product will actually be supplied or applied.

Who uses EN 4500-003:2026?

EN 4500-003:2026 is used by standards writers and technical committees preparing aerospace material standards, especially within the EN 4500 series. It is also used by aerospace materials engineers, quality managers, laboratories, purchasers, and manufacturers when they draft or check a specification for heat-resisting alloys.

In practice, these users rely on it to decide how to write the title, how to complete Table 1, which test and inspection lines to include, and how to structure qualification requirements. That helps when defining forgings, wrought products, castings, or powder-based products for aerospace supply chains.

What changed in EN 4500-003:2026 from the previous edition?

The foreword states that this edition supersedes EN 4500-003:2024. It also lists these changes compared with that edition:

• addition of line 4.3, "Further intended processing", and line 5.2, "Dimensional standard", in the body of the document and in Annex D;
• addition of introductory sentences to Table 1 in Annex C to make clear that the table is a normative element and that all listed documents shall be applied;
• editorial clarifications on whether references to other documents or annexes are normative or informative;
• restructuring and simplification of the template to create a single continuous table.

Which standards are used with EN 4500-003:2026?

EN 4500-003:2026 is used together with a set of general, companion, and test standards that support drafting, designation, qualification, and testing.

• EN 4500-001 - the general rules for drafting and presentation; it is the base document for the series and is used throughout Table 1.
• EN 4259 - the source of general aerospace metallic-material terms and definitions.
• EN 10027-1 and EN 10027-2 - designation systems used for material designation in Table 1.
• EN 4258 - explains the general organization of aerospace metallic-material standardization and the link between standard types.
• EN 2002-001 - gives the tensile test method at ambient temperature, used in the supporting test lines.
• EN 2043 - covers general requirements for semi-finished product qualification, outside forgings and castings.
• EN 2950:2008 and EN 2957 - support micrographic/macrographic examination and preparation of forged samples.
• EN 6018 and EN ISO 643 - support density measurement and grain size determination.
• EN 4700-001 to EN 4700-004 - provide technical specifications for wrought products such as plate, sheet and strip, bars and sections, tube, and wire that appear in the examples.

What does the EN 4500-003:2026 document contain?

EN 4500-003:2026 contains the drafting framework for an aerospace material standard and worked examples showing how to complete it. Annex A shows a completed title page, Annex B shows the introduction, Annex C completes the scope, normative references, terms and definitions, and requirements, and Annex D gives a line-by-line example for Table 1.

Annex D is the most practical part for day-to-day use because it shows how the template handles chemical composition, heat treatment, mechanical properties, microstructure, macrostructure, fatigue, fracture toughness, surface condition, cleanliness, density, elastic modulus, and product qualification. Annex E completes the bibliography, so a standards writer can see how the supporting documents are listed.

SLOVENSKI STANDARD
oSIST prEN 4500-003:2025
01-oktober-2025
Aeronavtika - Kovinski materiali - Pravila za načrtovanje in predstavljanje
standardov za materiale - 003. del: Posebna pravila za toplotno odporne zlitine
Aerospace series - Metallic materials - Rules for drafting and presentation of material
standards - Part 003: Specific rules for heat-resisting alloys
Luft- und Raumfahrt - Metallische Werkstoffe - Regeln für das Erstellen und die
Gestaltung von Werkstoffnormen - Teil 003: Besondere Regeln für hochwarmfeste
Legierungen
Série aérospatiale - Matériaux métalliques - Règles pour la rédaction et la présentation
des normes de matériaux - Partie 003 : Règles spécifiques aux alliages résistant à chaud
Ta slovenski standard je istoveten z: prEN 4500-003
ICS:
01.120 Standardizacija. Splošna Standardization. General
pravila rules
49.025.05 Železove zlitine na splošno Ferrous alloys in general
49.025.15 Neželezove zlitine na Non-ferrous alloys in general
splošno
oSIST prEN 4500-003:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 4500-003:2025
oSIST prEN 4500-003:2025
DRAFT
EUROPEAN STANDARD
prEN 4500-003
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2025
ICS 01.120 Will supersede EN 4500-003:2024
English Version
Aerospace series - Metallic materials - Rules for drafting
and presentation of material standards - Part 003: Specific
rules for heat-resisting alloys
Série aérospatiale - Matériaux métalliques - Règles Luft- und Raumfahrt - Metallische Werkstoffe - Regeln
pour la rédaction et la présentation des normes de für das Erstellen und die Gestaltung von
matériaux - Partie 003 : Règles spécifiques aux alliages Werkstoffnormen - Teil 003: Besondere Regeln für
résistant à chaud hochwarmfeste Legierungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

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. prEN 4500-003:2025 E
worldwide for CEN national Members.

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prEN 4500-003:2024 (E)
Contents Page
Foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Rules for drafting a European standard for aerospace metallic materials. 6
4.1 General. 6
4.2 Title . 6
4.2.1 General. 6
4.2.2 Method of melting . 6
4.2.3 Form entries . 7
4.2.4 Form entries for powder metallurgy . 8
4.2.5 Additional information entries . 9
4.3 Introduction . 9
4.3.1 General. 9
4.4 Scope, normative references, terms and definitions, requirements . 9
4.5 Table 1 . 9
4.5.1 Line 1: Material designation . 9
4.5.2 Line 2: Chemical composition. 9
4.5.3 Line 3: Method of melting . 9
4.5.4 Line 4.1: Form . 10
4.5.5 Line 4.2: Method of production . 10
4.5.6 Line 4.3: Further intended processing . 10
4.5.7 Line 4.4: Limit dimension(s) . 10
4.5.8 Line 5.1: Technical specification . 10
4.5.9 Line 5.2: Dimensional standard . 10
4.5.10 Line 6.1: Delivery condition and Heat treatment . 10
4.5.11 Line 6.2: Delivery condition code . 11
4.5.12 Line 7: Use condition and Heat treatment . 11
4.5.13 Line 8.1: Test sample(s) . 11
4.5.14 Line 8.2: Test piece(s) . 11
4.5.15 Line 8.3: Heat treatment . 11
4.5.16 Line 9: Dimensions concerned . 11
4.5.17 Line 10: Thickness of cladding on each face . 11
4.5.18 Line 11: Direction of test piece . 11
4.5.19 Lines 12 to 16: Tensile (T) . 11
4.5.20 Line 17: Hardness . 11
4.5.21 Line 18: Shear strength . 12
4.5.22 Line 19: Bending . 12
4.5.23 Line 20: Impact strength . 12
4.5.24 Lines 21 to 26: Creep (C) . 12
4.5.25 Line 27 . 12
4.5.26 Line 29: Reference heat treatment . 12
4.5.27 Lines 30 to 94 . 12
4.5.28 Line 95: Marking inspection . 12
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4.5.29 Line 96: Dimensional inspection . 12
4.5.30 Line 97 . 12
4.5.31 Line 98: Notes . 12
4.5.32 Line 99: Typical use . 12
4.5.33 Line 100: Product qualification . 13
4.6 Bibliography . 13
Annex A (informative) Completion of title page . 14
Annex B (informative) Completion of the introduction . 15
Annex C (informative) Completion of the scope, normative references, terms and definitions,
and requirements . 16
Annex D (informative) Completion of Table 1 . 17
Annex E (informative) Completion of the bibliography. 25
Bibliography . 26
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Foreword
This document (prEN 4500-003:2025) has been prepared by the Technical Committee ASD-STAN/D04
“Material”.
This document is currently submitted to the CEN Enquiry
This document will supersede EN 4500-003:2025
prEN 4500-003:2025 includes the following significant technical changes with respect
to EN 4500-003:2024:
— addition of the lines 4.3 "Further intended processing" and 5.2 "Dimensional standard" in the body
of the document and in Annex D;
— addition of introductory sentences to Table 1 in Annex C to highlight the fact that the table is a
normative element and that all the documents that it lists shall be applied;
— overall editorial modifications to give clarity on the normative or informative nature of the
references made to other documents or Annexes;
— restructuring of the document and simplification of the Template to achieve a single continuous table.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
oSIST prEN 4500-003:2025
prEN 4500-003:2025 (E)
Introduction
This document is part of the series of EN metallic material standards for aerospace applications.
The general organization of this series is described in EN 4258.
The EN 4500 series (Aerospace series — Metallic materials — Rules for drafting and presentation of
material standards) is composed by the following documents:
— General rules EN 4500-001;
— Specific rules for aluminium, aluminium alloys and EN 4500-002;
magnesium alloys
— Specific rules for heat-resisting alloys EN 4500-003;
— Specific rules for titanium and titanium alloys EN 4500-004;
— Specific rules for steels EN 4500-005;
— Specific rules for filler metals for welding EN 4500-002 to EN 4500-005;
— Specific rules for filler metals for brazing EN 4500-006.
Basis for the drafting of all European standards is CEN/CENELEC Internal Regulations — Part 3: Principles
and rules for the structure and drafting of CEN and CENELEC documents.
oSIST prEN 4500-003:2025
prEN 4500-003:2025 (E)
1 Scope
The EN 4500 series specifies the rules for the drafting and presentation of metallic material standards
for aerospace applications.
This Part 003 specifies the “Specific rules for heat resisting alloys”.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 4500-001, Aerospace series - Metallic materials - Rules for drafting and presentation of material
standards - Part 001: General rules
EN 4259, Aerospace series - Metallic materials - Definition of general terms
EN 10027-1, Designation systems for steels - Part 1: Steel names
EN 10027-2, Designation systems for steels - Part 2: Numerical system
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 4259 and EN 4500-001 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Rules for drafting a European standard for aerospace metallic materials
4.1 General
Examples given in annexes are only intended to illustrate the rules for drafting and presentation and
might not correspond to real standardized EN semi-finished products. Technological development can
require the use of terms additional to those listed.
4.2 Title
4.2.1 General
Shall be according to EN 4500-001.
See also Annex A of this document.
The following are examples of descriptions which shall be used.
4.2.2 Method of melting
Complete in accordance with EN 4500-001 using one or more of the following terms:
— air melted;
— vacuum melted;
— vacuum refined;
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prEN 4500-003:2025 (E)
— vacuum arc melted;
— vacuum arc remelted;
— electro-slag remelted;
— consumable electrode remelted;
— inert gas atomised;
— rotating electrode atomised;
— rotating crucible atomised;
— water atomised.
4.2.3 Form entries
a) Sheets, strips, plates:
The terms may be qualified with one of the following terms:
1) rolled;
2) cold rolled;
3) hot rolled.
b) Bars:
The term may be qualified with one or more of the following terms:
1) hot rolled;
2) cold rolled;
3) drawn;
4) extruded.
c) Sections:
The term may be qualified with one or more of the following terms:
1) extruded;
2) hot rolled.
d) Tubes:
The term may be qualified with one or more of the following terms:
1) rolled;
2) drawn;
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3) extruded;
4) seamless;
5) welded.
e) Wires:
The term may be qualified with one or more of the following terms:
1) drawn;
2) hot rolled.
f) Forging stock;
g) Forgings:
The term may be qualified with one or more of the following terms:
1) die;
2) hand.
h) Remelting stock;
i) Castings:
The term may be qualified with one or more of the following terms:
1) sand;
2) chill;
3) investment;
4) centrifugal;
5) precision;
6) hot isostatically pressed (hipped).
4.2.4 Form entries for powder metallurgy
— Powder;
— Compacted material;
— Part:
The term may be qualified with one or more of the following terms:
o hot isostatically pressed (hipped);
o extruded;
oSIST prEN 4500-003:2025
prEN 4500-003:2025 (E)
o forged.
4.2.5 Additional information entries
— For structural applications;
— For pressure applications;
— For rivets;
— For forged fasteners;
— For forged rings;
— For machined fasteners;
— For welding.
4.3 Introduction
4.3.1 General
Shall be according to EN 4500-001.
See also Annex B of this document.
4.4 Scope, normative references, terms and definitions, requirements
Shall be according to EN 4500-001.
See also Annex C of this document.
4.5 Table 1
4.5.1 Line 1: Material designation
Shall be according to EN 4500-001.
See also Annex D of this document.
For steels, the designation shall be according to EN 10027-1 and EN 10027-2.
4.5.2 Line 2: Chemical composition
The chemical composition shall be written in accordance with EN 4500-001 and the order of presentation
of elements shall conform to the following rules:
— C, Si, Mn, P, S;
— alloying elements in alphabetical order using their chemical symbol;
— ratio and/or total of above elements in alphabetical order;
— trace elements in alphabetical order.
4.5.3 Line 3: Method of melting
Shall be according to EN 4500-001.
See also Annex D of this document.
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The terms listed in 4.2.2 shall be used.
4.5.4 Line 4.1: Form
Shall be according to EN 4500-001.
See also Annex D of this document.
4.5.5 Line 4.2: Method of production
Shall be according to EN 4500-001.
See also Annex D of this document.
The applicable terms given in 4.2 shall be used.
4.5.6 Line 4.3: Further intended processing
Shall be according to EN 4500-001.
See also Annex D of this document.
4.5.7 Line 4.4: Limit dimension(s)
Shall be according to EN 4500-001.
See also Annex D of this document.
4.5.8 Line 5.1: Technical specification
Sha
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