EN 3973:2006
(Main)Aerospace series - Steel FE-CM3801 (X5CrNiCuNb16-4) - Homogenized, solution treated and precipitation hardened - Investment casting - De ≤ 50 mm - Rm ≥ 1 030 MPa
Aerospace series - Steel FE-CM3801 (X5CrNiCuNb16-4) - Homogenized, solution treated and precipitation hardened - Investment casting - De ≤ 50 mm - Rm ≥ 1 030 MPa
This standard specifies the requirements relating to:
Steel FE-CM3801 (X5CrNiCuNb16-4)
Homogenized, solution treated and precipitation hardened
Investment casting
De £ 50 mm
Rm ³ 1 030 MPa
for aerospace applications.
Luft- und Raumfahrt - Stahl FE-CM3801 (X5CrNiCuNb16-4) - Diffusionsgeglüht, lösungsgeglüht und ausgelagert - Feingussstücke - De = 50 mm - Rm = 1 030 MPa
Série aérospatiale - Acier FE-CM3801 (X5CrNiCuNb16-4) - Homogénéisé, mis en solution et durci par précipitation - Pièces moulées en cire perdue - De = 50 mm - Rm = 1 030 MPa
Diese Norm legt die Anforderungen an
Stahl FE-CM3801 (X5CrNiCuNb16-4)
Diffusionsgeglüht, lösungsgeglüht und ausgelagert
Feingussstücke
De 50 mm
Rm ≥ 1 030 MPa
für die Anwendung in der Luft und Raumfahrt fest.
Aeronavtika - Jeklo FE-CM3801 (X5CrNiCuNb16-4) - Homogenizirani, obdelani v raztopini in utrjeni - Ulitki - De ≤ 50 mm - Rm ≥ 1030 MPa
General Information
- Status
- Published
- Publication Date
- 19-Dec-2006
- Withdrawal Date
- 29-Jun-2007
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 4 - Metallic
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 01-Jun-2017
- Completion Date
- 28-Jan-2026
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 3973:2006 is a CEN aerospace material standard that specifies requirements for steel FE-CM3801 (X5CrNiCuNb16-4) produced by investment casting (lost‑wax process) for aerospace applications. The standard covers castings with a maximum effective diameter De ≤ 50 mm supplied in a homogenized, solution treated and precipitation hardened delivery condition and requiring a minimum tensile strength Rm ≥ 1 030 MPa.
Key topics and requirements
- Material designation & chemistry: Steel FE-CM3801 (X5CrNiCuNb16-4) with specified limits for C, Si, Mn, P, S, Cr, Ni, Cu, N, Nb+Ta (see standard for full table).
- Melting & production: Air-melted, cast from remelting stock; form specified as investment casting (lost-wax).
- Size limit: Effective diameter De ≤ 50 mm (properties for De > 25 mm may require agreement between purchaser and manufacturer).
- Delivery condition: Homogenized, solution treated and precipitation hardened; heat-treatment sequence is defined (e.g., homogenize at 1 150 °C / solution treat ~1 040 °C / precipitation at 540 °C – see standard for exact cycles).
- Mechanical properties: Minimum proof stress Rp0.2 ≥ 900 MPa, tensile strength Rm ≥ 1 030 MPa, elongation A and reduction of area Z minimums, and hardness ≥ 34 HRC.
- Microstructure & defects: δ‑ferrite content ≤ 15 %; requirements for internal/external defects and weld repair follow EN 2103-3.
- Testing & inspection: Specified test specimens, batch testing, dimensional and marking inspection per EN 2103-3 and related documents.
- Product qualification: Qualification program to be agreed between manufacturer and purchaser.
Practical applications
- Intended for aerospace components where very high strength, good toughness and stability after precipitation hardening are required - examples include small high‑stress cast parts in airframes, actuators, hydraulic components and engine accessories (typical applications depend on design and qualification).
- Applicable where investment casting geometry and fine detail are needed together with high mechanical performance.
- Useful for procurement specifications, engineering design data sheets, quality assurance and certification of cast aerospace steels.
Who uses this standard
- Aerospace materials engineers and metallurgists
- Foundries and investment casting manufacturers supplying aerospace parts
- Procurement and quality assurance teams writing purchase specifications
- Certification and testing laboratories performing mechanical and microstructural verification
Related standards
- EN 2103-3 (pre‑production and production castings technical specification)
- EN 3484 (remelting stock and reference heat treatment)
- EN 4258 (organization of aerospace metallic material standards)
- EN 4436 (δ‑ferrite test method)
- EN 4500‑5 (rules for drafting/presentation of steel standards)
Keywords: EN 3973, FE-CM3801, X5CrNiCuNb16-4, aerospace steel, investment casting, precipitation hardened, homogenized, solution treated, Rm ≥ 1030 MPa, De ≤ 50 mm.
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Frequently Asked Questions
EN 3973:2006 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Steel FE-CM3801 (X5CrNiCuNb16-4) - Homogenized, solution treated and precipitation hardened - Investment casting - De ≤ 50 mm - Rm ≥ 1 030 MPa". This standard covers: This standard specifies the requirements relating to: Steel FE-CM3801 (X5CrNiCuNb16-4) Homogenized, solution treated and precipitation hardened Investment casting De £ 50 mm Rm ³ 1 030 MPa for aerospace applications.
This standard specifies the requirements relating to: Steel FE-CM3801 (X5CrNiCuNb16-4) Homogenized, solution treated and precipitation hardened Investment casting De £ 50 mm Rm ³ 1 030 MPa for aerospace applications.
EN 3973:2006 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 3973:2006 has the following relationships with other standards: It is inter standard links to EN 2103-3:1991, EN 4258:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3973:2006 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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Stahl FE-CM3801 (X5CrNiCuNb16-4) - Diffusionsgeglüht, lösungsgeglüht und ausgelagert - Feingussstücke - De = 50 mm - Rm = 1 030 MPaSérie aérospatiale - Acier FE-CM3801 (X5CrNiCuNb16-4) - Homogénéisé, mis en solution et durci par précipitation - Pièces moulées en cire perdue - De = 50 mm - Rm = 1 030 MPa49.025.10JeklaSteelsICS:Ta slovenski standard je istoveten z:EN 3973:2006SIST EN 3973:2009en,de01-maj-2009SIST EN 3973:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3973
December 2006 ICS 49.025.10 English Version
Aerospace series - Steel FE-CM3801 (X5CrNiCuNb16-4) - Homogenized, solution treated and precipitation hardened - Investment casting - De ≤ 50 mm - Rm ≥ 1 030 MPa
Série aérospatiale - Acier FE-CM3801 (X5CrNiCuNb16-4) -Homogénéisé, mis en solution et durci par précipitation - Pièces moulées en cire perdue - De ≤ 50 mm - Rm ≥1 030 MPa
Luft- und Raumfahrt - Stahl FE-CM3801 (X5CrNiCuNb16-4) - Homogenisiet, lösungsgeglüht und ausgelagert - Feingußstücke durch Wachsausschmelzverfahren - De ≤ 50 mm - Rm ≥ 1 030 MPa This European Standard was approved by CEN on 18 October 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
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B-1050 Brussels © 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3973:2006: ESIST EN 3973:2009
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