EN 4904:2022
(Main)Aerospace series - Steel 36NiCrMo16 (1.6773) - 1 000 MPa ≤ Rm ≤ 1 200 MPa - Bars - 100 mm ≤ D ≤ 250 mm
Aerospace series - Steel 36NiCrMo16 (1.6773) - 1 000 MPa ≤ Rm ≤ 1 200 MPa - Bars - 100 mm ≤ D ≤ 250 mm
This document specifies the requirements relating to:
Steel 36NiCrMo16
1 000 MPa ≤ Rm ≤ 1 200 MPa
Bars
100 mm ≤ D ≤ 250 mm
for aerospace applications.
Luft- und Raumfahrt - Stahl 36NiCrMo16 (1.6773) - 1 000 MPa ≤ Rm ≤ 1 200 MPa - Stangen - 100 mm ≤ D ≤ 250 mm
Dieses Dokument legt die Anforderungen an:
Stahl 36NiCrMo16 (1.6773)
1 000 MPa ≤ Rm ≤ 1 200 MPa
Stangen
100 mm ≤ D ≤ 250 mm
für Anwendungen in der Luft- und Raumfahrt fest.
Série aérospatiale - Acier 36NiCrMo16 (1.6773) - 1 000 MPa ≤ Rm ≤ 1 200 MPa - Barres - 100 mm ≤ D ≤ 250 mm
Le présent document spécifie les exigences relatives à :
Acier 36NiCrMo16
1 000 MPa ≤ Rm ≤ 1 200 MPa
Barres
100 mm ≤ D ≤ 250 mm
pour les applications aérospatiales.
Aeronavtika - Jeklo 36NiCrMo16 (1.6773) - 1000 MPa ≤ Rm ≤ 1200 MPa - Palice - 100 mm ≤ D ≤ 250 mm
Ta dokument določa zahteve, ki se navezujejo na:
jeklo 36NiCrMo16,
1000 MPa ≤ Rm ≤ 1200 MPa,
palice,
100 mm ≤ D ≤ 250 mm,
za uporabo v aeronavtiki.
General Information
- Status
- Published
- Publication Date
- 20-Dec-2022
- 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
- 21-Dec-2022
- Completion Date
- 21-Dec-2022
Overview
EN 4904:2022 is a European Standard developed by the Aerospace and Defence Industries Association of Europe (ASD-STAN) and ratified by CEN. It specifies stringent requirements for Steel 36NiCrMo16 (1.6773) bars primarily used in aerospace applications. The standard addresses mechanical properties, chemical composition, dimensional tolerances, and quality control protocols for bars with diameters ranging from 100 mm to 250 mm, and tensile strength between 1,000 MPa and 1,200 MPa. This standard ensures reliability and uniformity in aerospace-grade steel materials, supporting high-performance and safety-critical aerospace components.
Key Topics
- Material Specification: Steel 36NiCrMo16 (1.6773), designed for high-strength aerospace applications requiring tensile strength (Rm) between 1,000 MPa and 1,200 MPa.
- Dimension Range: Bars with diameters from 100 mm to 250 mm, suitable for manufacturing robust aerospace components.
- Chemical Composition:
- Carbon (C): 0.30% to 0.40%
- Silicon (Si): 0.15% to 0.40%
- Manganese (Mn): 0.30% to 0.60%
- Chromium (Cr): 1.60% to 2.00%
- Molybdenum (Mo): 0.25% to 0.60%
- Nickel (Ni): 3.50% to 4.20%
- Phosphorus (P) and Sulfur (S) kept at minimal values to enhance toughness and fatigue resistance.
- Mechanical Properties:
- Yield strength (proof stress Rₚ0.2): ≥ 800 MPa
- Tensile strength (Rm): 1,000 MPa to 1,200 MPa
- Elongation: ≥ 11%
- Reduction of area: ≥ 50%
- Hardness: ≤ 293 HB (Brinell Hardness)
- Impact strength: ≥ 45 J at ambient temperature
- Heat Treatment: Hardened and tempered condition involving quenching between 860 °C and 880 °C followed by tempering at a minimum of 560 °C, to achieve the required strength and toughness.
- Quality Assurance:
- Non-metallic inclusions controlled per EN 2951.
- Ultrasonic inspection compliant with EN 4050-4 for internal imperfection detection.
- Visual inspection in line with EN 4700-002 criteria.
- Grain size and external condition according to EN 4700-002.
- Delivery Condition: Bars are supplied in an annealed, hardened, and tempered state, ensuring consistent mechanical performance.
Applications
EN 4904:2022 steel bars are engineered to serve critical aerospace industry needs, offering excellent mechanical properties, fatigue resistance, and structural integrity. Key applications include:
- Aerospace Structural Components: Manufacturing of high-strength structural parts where dimensional stability and mechanical reliability are paramount.
- Landing Gear and Shock Absorber Components: Steel bars that endure high loads and impact, thanks to the required toughness and strength.
- Engine and Transmission Shafts: Components exposed to cyclic stress, benefiting from the standard’s stringent mechanical and metallurgical requirements.
- Fasteners and Aircraft Frames: Where uniformity in material characteristics instantly impacts safety and operational efficiency.
- Specialized Aerospace Equipment: Any application demanding robust metallic bars with minimum defects and guaranteed performance.
Related Standards
EN 4904:2022 integrates with several aerospace material standards to ensure comprehensive quality and consistency across aerospace manufacturing:
- EN 4258: Describes the general organization of aerospace metallic material standards and their interrelations.
- EN 4700-002: Specifies technical requirements for wrought steel products such as bars and sections relevant to aerospace use.
- EN 2951: Relates to the micrographic determination of non-metallic inclusions affecting steel purity.
- EN 4050-4: Establishes acceptance criteria and ultrasonic testing methods for inspecting metallic bars to detect internal flaws.
- EN 4500-005: Provides rules for drafting steel material standards within the aerospace series.
These standards collectively ensure the steel bars meet the highest aerospace material integrity, traceability, and performance standards necessary for critical applications.
Keywords: EN 4904, aerospace steel standard, Steel 36NiCrMo16, high-strength steel bars, aerospace material requirements, steel bars 100 mm to 250 mm, aerospace applications steel, tensile strength 1000-1200 MPa, aerospace material testing, hardened and tempered steel bars.
Frequently Asked Questions
EN 4904:2022 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Steel 36NiCrMo16 (1.6773) - 1 000 MPa ≤ Rm ≤ 1 200 MPa - Bars - 100 mm ≤ D ≤ 250 mm". This standard covers: This document specifies the requirements relating to: Steel 36NiCrMo16 1 000 MPa ≤ Rm ≤ 1 200 MPa Bars 100 mm ≤ D ≤ 250 mm for aerospace applications.
This document specifies the requirements relating to: Steel 36NiCrMo16 1 000 MPa ≤ Rm ≤ 1 200 MPa Bars 100 mm ≤ D ≤ 250 mm for aerospace applications.
EN 4904:2022 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 4904:2022 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-marec-2023
Aeronavtika - Jeklo 36NiCrMo16 (1.6773) - 1000 MPa ≤ Rm ≤ 1200 MPa - Palice - 100
mm ≤ D ≤ 250 mm
Aerospace series - Steel 36NiCrMo16 (1.6773) - 1 000 MPa ≤ Rm ≤ 1 200 MPa - Bars -
100 mm ≤ D ≤ 250 mm
Luft- und Raumfahrt - Stahl 36NiCrMo16 (1.6773) - 1 000 MPa ≤ Rm ≤ 1 200 MPa -
Stangen - 100 mm ≤ D ≤ 250 mm
Série aérospatiale - Acier 36NiCrMo16 (1.6773) - 1 000 MPa ≤ Rm ≤ 1 200 MPa - Barres
- 100 mm ≤ D ≤ 250 mm
Ta slovenski standard je istoveten z: EN 4904:2022
ICS:
49.025.10 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 4904
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2022
EUROPÄISCHE NORM
ICS 49.025.10
English Version
Aerospace series - Steel 36NiCrMo16 (1.6773) - 1 000 MPa
≤ Rm ≤ 1 200 MPa - Bars - 100 mm ≤ D ≤ 250 mm
Série aérospatiale - Acier 36NiCrMo16 (1.6773) - 1 000 Luft- und Raumfahrt - Stahl 36NiCrMo16 (1.6773) - 1
MPa ≤ Rm ≤ 1 200 MPa - Barres - 100 mm ≤ D ≤ 250
000 MPa ≤ Rm ≤ 1 200 MPa - Stangen - 100 mm ≤ D ≤
mm 250 mm
This European Standard was approved by CEN on 2 October 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4904:2022 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 4904:2022) 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 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 European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2023, and conflicting national standards shall be
withdrawn at the latest by June 2023 .
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
...
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