SIST EN 3971:2009

Aerospace series - Steel FE-PL1507 (40CrMoV12) - Consumable electrode remelted - Annealed - Forging stock - a or D ≤ 350 mm

This standard specifies the requirements relating to:
Steel FE-PL1507 (40CrMoV12)
Consumable electrode remelted
Annealed
Forging stock
a or D ≤ 350 mm
for aerospace applications.

Luft- und Raumfahrt - Stahl FE-PL1507 (40CrMoV12) - Mit selbstverzehrender Elzektrode umgeschmolzen - Geglüht - Schmiedevormaterial - a oder D ≤ 350 mm

Diese Norm legt die Anforderungen an
Stahl FE-PL1507 (40CrMoV12)
Mit selbstverzehrender Elektrode umgeschmolzen
Geglüht
Schmiedevormaterial
a oder D ≤  350 mm
für die Anwendung in der Luft  und Raumfahrt fest.

Série aérospatiale - Acier FE-PL1507 (40CrMoV12) - Refondu à l'électrode consommable - Recuit - Produits destinés à la forge - a ou D ≤ 350 mm

Aeronavtika - Jeklo FE-PL1507 (40CrMoV12) - Pretaljeno s talilno elektrodo - Žarjeno - Material za kovanje - a ali D ≤ 350 mm

General Information

• Status: Published
• Publication Date: 31-Mar-2009
• ICS: 49.025.10 - Steels
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 20-Mar-2009
• Due Date: 25-May-2009
• Completion Date: 01-Apr-2009
• Ref Project: EN 3971:2006 - Aerospace series - Steel FE-PL1507 (40CrMoV12) - Consumable electrode remelted - Annealed - Forging stock - a or D ≤ 350 mm

Relations

• Refers: SIST 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
• Refers: SIST EN 2157-2:2001 - Aerospace series - Steel - Forging stock and forgings - Technical specification - Part 2: Forging stock
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 4098:2007 - Aerospace series - Steel FE-PL1507 (40CrMoV12) - Remelted, hardened and tempered, forgings De <= 50 mm, 1 250 MPa <= Rm <= 1 400 MPa
• Effective Date: 28-Jan-2026
• Referred By: SIST 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
• Referred By: SIST EN 4098:2026 - Aerospace series - Steel 40CrMoV12 (1.8523) - Consumable electrode remelted - Hardened and tempered - Forgings - De ≤ 50 mm - 1 250 MPa ≤ Rm ≤ 1 400 MPa
• Effective Date: 28-Jan-2026

Overview

SIST EN 3971:2009 is a European standard that specifies the requirements for steel FE-PL1507 (40CrMoV12) intended for use in aerospace applications. This document outlines the material specification for forgings stock produced via consumable electrode remelting and annealing, with limiting dimensions where the diameter or side (a or D) is less than or equal to 350 mm. Developed by the Slovenski inštitut za standardizacijo (SIST), this standard supports the aerospace sector by ensuring material consistency, reliability, and adherence to stringent safety and performance criteria.

Key Topics

• Material Specification: Covers steel FE-PL1507 (known as 40CrMoV12), a low alloy general-purpose steel favored for its mechanical properties and suitability for further processing, such as nitriding.
• Manufacturing Process: Specifies the use of consumable electrode remelting-a process that improves material cleanliness and homogeneity.
• Condition and Form: Details the supply condition as annealed forging stock, which enhances machinability and prepares the material for subsequent processes.
• Dimensional Limits: Applies to products with cross-sectional diameter or side length up to 350 mm.
• Testing and Qualification: References standard test methods for grain size, macrostructure, and mechanical properties. Qualification processes are agreed upon between manufacturer and purchaser, ensuring fit-for-purpose materials.

Applications

SIST EN 3971:2009 plays a crucial role in the aerospace industry by providing:

• Reliable Forging Stock: The standard is designed for steel products that will undergo forging processes to create high-strength, durable, and precision aerospace components such as gears, shafts, fasteners, and structural parts.
• Consistent Raw Material Quality: By specifying detailed production and inspection criteria, the standard helps aerospace manufacturers minimize defects, reduce risk, and ensure traceability in critical applications.
• Enhanced Performance: Consumable electrode remelted and annealed steel exhibits improved toughness, homogeneity, and resistance to fatigue and wear - essential for demanding aerospace environments.
• Suitability for Surface Treatments: The steel covered by SIST EN 3971:2009 is suitable for nitriding and other surface treatments, making it adaptable for components requiring hard, wear-resistant surfaces without losing core toughness.

Related Standards

This document is part of an integrated series of EN standards governing metallic materials for aerospace use. Relevant and referenced standards include:

• EN 2157-2: Aerospace series - Steel - Forging stock and forgings - Technical specification.
• EN 2002-8: Aerospace series - Metallic materials - Test methods (Grain size determination).
• EN 2003-7: Aerospace series - Steel - Macrographic test methods.
• EN 2043: General requirements for qualification of semi-finished products.
• EN 2957: Preparation of forged samples for metallic materials.
• EN 4258: General organization of standardization for metallic materials in aerospace.
• EN 4500-5: Rules for drafting and presentation of material standards - Specific rules for steels.

SIST EN 3971:2009 is identical to EN 3971:2006, ensuring harmonized technical requirements across European aerospace sectors.

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Adopting SIST EN 3971:2009 ensures material traceability, process control, and compliance with aerospace quality management systems, supporting aerospace manufacturing reliability and safety.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2009
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Ta slovenski standard je istoveten z: EN 3971:2006
ICS:
49.025.10 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 3971
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2006
ICS 49.025.10
English Version
Aerospace series - Steel FE-PL1507 (40CrMoV12) -
Consumable electrode remelted - Annealed - Forging stock - a
or D ≤ 350 mm
Série aérospatiale - Acier FE-PL1507 (40CrMoV12) - Luft- und Raumfahrt - Stahl FE-PL1507 (40CrMoV12) - Mit
Refondu à l'électrode consommable - Recuit - Produits selbstverzehrender Elektrode umgeschmolzen - Geglüht -
destinés à la forge - a ou D ≤ 350 mm Schmiedevormaterial - a oder D ≤ 350 mm
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,
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Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

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EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3971:2006: E
worldwide for CEN national Members.

Foreword
This document (EN 3971:2006) 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 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 2007, and conflicting national standards shall be withdrawn at
the latest by June 2007.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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 the United Kingdom.
Introduction
This standard is part of the series of EN metallic material standards for aerospace applications. The general
organization of this series is described in EN 4258.
This standard has been prepared in accordance with EN 4500-5.
1 Scope
This standard specifies the requirements relating to:
Steel FE-PL1507 (4
...