EN 3972:2006

• Abstract:

  This standard specifies the requirements relating to:; Steel FE-PL1507 (40CrMoV12); Consumable electrode remelted; Hardened and tempered; Bar for machining; De  50 mm; 1 250 MPa  Rm  1 400 MPa; for aerospace applications.

• Status: Published
• Publication Date: 19-Dec-2006
• Withdrawal Date: 29-Jun-2007
• ICS: 49.025.10 - Steels
• 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: 30-Sep-2026
• Ref Project: SIST EN 3972:2009 - Aerospace series - Steel FE-PL1507 (40CrMoV12) - Consumable electrode remelted - Hardened and tempered - Bar for machining - De ≤ 50 mm - 1 250 MPa ≤ Rm ≤ 1 400 MPa

• Refers: EN 4258:2024 - Aerospace series - Metallic materials - General organization of standardization - Link between types of European Standards and their use
• Effective Date: 28-Jan-2026
• Referred By: EN 4632-003:2010 - Aerospace series - Weldability and brazeability of materials in aerospace constructions - Part 003: Welding and brazing of homogeneous assemblies of unalloyed and low alloy steels
• Effective Date: 28-Jan-2026

Overview

EN 3972:2006 is a European standard established by CEN, specifying the technical requirements for Steel FE-PL1507 (also known as 40CrMoV12) used in aerospace applications. This high-performance steel is produced using a consumable electrode remelting process and is delivered in a hardened and tempered condition. It is supplied as bars for machining with nominal diameters up to 50 mm. The steel exhibits a high tensile strength range of 1,250 MPa to 1,400 MPa, ensuring robust mechanical properties suitable for demanding aerospace environments.

Key Topics

• Material Composition: Steel FE-PL1507 (40CrMoV12) contains controlled amounts of carbon, silicon, manganese, chromium, molybdenum, vanadium, and trace elements to optimize strength and heat resistance.
• Production Process: Consumable electrode remelting ensures high purity and consistent microstructure suited for aerospace-grade components.
• Heat Treatment: Bars are hardened and tempered with a specific heat treatment cycle (910 °C to 950 °C followed by tempering at ≥ 600 °C), providing the steel with excellent toughness and machinability.
• Mechanical Properties:
  • Tensile strength (Rm): 1,250 to 1,400 MPa
  • Proof stress (Rp0.2): ≥ 1,030 MPa
  • Elongation: ≥ 10%
  • Reduction of area: ≥ 35%
  • Hardness: 375 to 401 HB
• Dimensional Scope: Bars with a diameter (De) of up to 50 mm.
• Testing & Quality Control: Compliance with aerospace-specific testing protocols including dimensional inspection, microstructure evaluation, and cleanliness standards as per related EN aerospace series standards.

Applications

EN 3972 steel bars are designed primarily for aerospace components requiring high strength, wear resistance, and precise machinability. Typical applications include:

• Structural parts subject to high mechanical stress in aircraft and spacecraft.
• Components in landing gear, engine mounts, and other critical aerospace assemblies.
• Tooling and fixtures used within aerospace manufacturing environments.
• Parts needing subsequent surface treatments such as nitriding for enhanced surface hardness and fatigue life.

The standard ensures that all aerospace parts manufactured from this material meet strict requirements for mechanical performance and traceability.

Related Standards

EN 3972:2006 is part of a series of aerospace metallic material standards and is linked to several complementary CEN documents:

• EN 2043 – General requirements for semi-finished product qualification (excluding forgings and castings) in aerospace metallic materials.
• EN 4258 – Organization and linkage of aerospace metallic material standards.
• EN 4500-5 – Rules for drafting and presenting aerospace material standards, specific to steels.
• EN 4700-2 – Technical specifications for wrought steel bars and sections used in aerospace.

Together, these standards create a comprehensive framework ensuring the high quality, safety, and reliability expected of aerospace materials and components.

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Keywords: EN 3972 steel, Steel FE-PL1507, 40CrMoV12, aerospace steel bar, consumable electrode remelted steel, hardened and tempered steel, aerospace material standards, high tensile strength steel, machining steel bars, aerospace-grade steel, European steel standard.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.HFWURGH03D49.025.10JeklaSteelsICS:Ta slovenski standard je istoveten z:EN 3972:2006SIST EN 3972:2009en,de01-maj-2009SIST EN 3972:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3972
December 2006 ICS 49.025.10 English Version
Aerospace series - Steel FE-PL1507 (40CrMoV12) - Consumable electrode remelted - Hardened and tempered -Bar for machining - De ≤ 50 mm - 1 250 MPa ≤ Rm ≤ 1 400 MPa
Série aérospatiale - Acier FE-PL1507 (40CrMoV12) - Refondu à l'électrode consommable - Trempé et revenu - Barres pour usinage - De ≤ 50 mm - 1 250 MPa ≤ Rm ≤ 1 400 MPa
Luft- und Raumfahrt - Stahl FE-PL1507 (40CrMoV12) - Mit selbstverzehrender Elektrode umgeschmolzen - Gehärtet und angelassen - Stangen zur spanenden Bearbeitung -De ≤ 50 mm - 1 250 MPa ≤ Rm ≤ 1 400 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
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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 3972:2006: ESIST EN 3972:2009
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