EN 3761:2020

Aerospace series - Heat resisting alloy FE-PA2601 - Softened and cold worked - Bar for forged fasteners - D ≤ 50 mm - 1 100 MPa ≤ Rm ≤ 1 300 MPa

This document specifies the requirements relating to:
Heat resisting alloy FE-PA2601
Softened and cold worked
Bar for forged fasteners
D ≤ 50 mm
1 100 MPa ≤ Rm ≤ 1 300 MPa
for aerospace applications.

Luft- und Raumfahrt - Hochwarmfeste Legierung FE-PA2601 - Weichgeglüht und kaltverfestigt - Stange für geschmiedete Verbindungselemente - D ≤ 50 mm - 1 100 MPa ≤ Rm ≤ 1 300 MPa

Dieses Dokument legt die Anforderungen an:
Hochwarmfeste Legierung FE-PA2601
weichgeglüht und kaltverfestigt
Stange zum Stauchen für Verbindungselemente
D ≤ 50 mm
1 100 MPa ≤ Rm ≤ 1 300 MPa
für Anwendungen in der Luft- und Raumfahrt fest.

Série aérospatiale - Alliage résistant à chaud FE-PA2601 - Adouci et écroui - Barre pour éléments de fixations forgés - D ≤ 50 mm - 1 100 MPa ≤ Rm ≤ 1 300 MPa

Le présent document spécifie les exigences relatives à :
Alliage résistant à chaud FE-PA2601
Adouci et écroui
Barre pour éléments de fixation forgés
D ≤ 50 mm
1 100 MPa ≤ Rm ≤ 1 300 MPa
pour applications aérospatiales.

Aeronavtika - Toplotno odporna zlitina FE-PA2601 - Popuščana in hladno obdelana - Palice za kovane vezne elemente - D ≤ 50 mm - 1100 MPa ≤ Rm ≤ 1300 MPa

Ta standard določa zahteve, ki se navezujejo na: toplotno odporno zlitino FE-PA2601, popuščana in hladno obdelana, palice za kovane vezne elemente D ≤ 50 mm, 1100 MPa ≤ Rm ≤ 1300 MPa za uporabo v aeronavtiki.

General Information

• Status: Published
• Publication Date: 14-Jan-2020
• Withdrawal Date: 30-Jul-2020
• ICS: 49.025.05 - Ferrous alloys in general
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4 - Metallic
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-Jan-2020
• Completion Date: 15-Jan-2020
• Ref Project: SIST EN 3761:2020 - Aerospace series - Heat resisting alloy FE-PA2601 - Softened and cold worked - Bar for forged fasteners - D ≤ 50 mm - 1 100 MPa ≤ Rm ≤ 1 300 MPa

Relations

• Refers: EN 2002-16:2019 - Aerospace series - Metallic materials - Test methods - Part 16: Non-destructive testing - Penetrant testing
• Effective Date: 28-Jan-2026
• Refers: EN 4700-002:2025 - Aerospace series - Steel and heat-resisting alloys for wrought products - Technical specification - Part 002: Bars and sections
• Effective Date: 28-Jan-2026
• Referred By: EN 3687:2026 - Aerospace series - Bolt, normal hexagon head, relieved shank, long thread, in heat resisting steel FE-PA2601 (A286), silver plated - Classification: 1 100 MPa/650 °C
• Effective Date: 25-Mar-2026
• Referred By: EN 4844:2022 - Aerospace series - Screws, 100° countersunk normal head, Spiral Drive Recess, threaded to head, in heat and corrosion resisting steel, passivated - Classification : 1 100 MPa (at ambient temperature) / 425 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 4846:2022 - Aerospace series - Screws, pan head, Spiral Drive Recess, threaded to head, in heat and corrosion resisting steel, passivated - Classification : 1 100 MPa (at ambient temperature) / 425 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 7010:2020 - Aerospace series - Configuration - Definition and designation for product standards for externally threaded fasteners
• Effective Date: 28-Jan-2026
• Referred By: EN 4853:2022 - Aerospace series - Externally threaded fastener, 100° countersunk normal head, Spiral Drive Recess - Classification: 1 100 MPa (at ambient temperature)/425 °C
• Effective Date: 28-Jan-2026

Overview

EN 3761:2020 is a European standard developed by CEN for the aerospace industry, specifying the requirements for bars made from heat resisting alloy FE-PA2601 in a softened and cold worked condition. These bars are intended specifically for the manufacturing of forged fasteners with diameters up to 50 mm, and with tensile strength in the range of 1,100 MPa to 1,300 MPa. The standard ensures consistent quality and performance of metallic bars used in critical aerospace applications, supporting the reliability and safety of fastener components in demanding operational environments.

Key Topics

• Material specification: The standard details the grade FE-PA2601, a heat resisting alloy suitable for aerospace fastener applications.
• Mechanical properties: Bars must meet stringent tensile strength (1,100-1,300 MPa) and proof stress requirements, supporting applications with demanding mechanical loads.
• Production and delivery condition: Specifies that bars should be softened, cold worked, straightened, and ground, with a maximum diameter of 50 mm.
• Heat treatment: Details delivery and reference heat treatments to ensure optimal microstructure and mechanical properties suitable for forging into fasteners.
• Testing and inspection: Outlines sampling, non-destructive testing (such as penetrant testing), and inspection for both external and internal defects according to referenced EN standards.
• Compliance and traceability: Bars must conform to additional technical specifications and requirements to ensure full traceability and qualification between manufacturers and purchasers.

Applications

EN 3761:2020 is directly relevant for:

• Aerospace fastener manufacturing: The primary use is for bars that will be forged into fasteners, such as bolts, studs, and other connector components for aircraft and spacecraft assemblies.
• Aerospace component suppliers: Organizations producing metallic raw materials for aviation and aerospace applications use this standard to ensure their products meet sector-specific strength and durability criteria.
• Quality assurance in supply chains: Ensures material consistency, performance, and compliance across different European and international aerospace projects.

Thanks to its focus on high-temperature resistance and specified mechanical performance, FE-PA2601 bars made to EN 3761:2020 are well-suited for structural applications where fasteners must maintain integrity in high-stress, high-heat environments often encountered in aerospace engineering.

Related Standards

Several other standards are referenced and related to EN 3761:2020, including:

• EN 4700-002: Technical specification for steel and heat resisting alloys – provides detailed requirements for bars and sections, including those intended for forging.
• EN 2002-16: Non-destructive testing (penetrant testing) – ensures product integrity through thorough inspection processes.
• EN 4258: Gives general organization and links between metallic material standards for aerospace, placing EN 3761 within a wider family of quality control documents.
• EN 4500-003: Explains material standards drafting and presentation, especially for heat resisting alloys.

Summary

By adhering to EN 3761:2020, aerospace manufacturers and suppliers ensure the consistent production of high-performance, heat resisting forged fastener bars. This supports safety, reliability, and traceability in aerospace assemblies that demand the highest material integrity. Following this standard helps meet regulatory, client, and industry requirements for metallic aerospace products, benefiting both suppliers and end users in the global aerospace sector.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2020
Aeronavtika - Toplotno odporna zlitina FE-PA2601 - Popuščana in hladno obdelana
- Palice za kovane vezne elemente - D ≤ 50 mm - 1100 MPa ≤ Rm ≤ 1300 MPa
Aerospace series - Heat resisting alloy FE-PA2601 - Softened and cold worked - Bar for
forged fasteners - D ≤ 50 mm - 1 100 MPa ≤ Rm ≤ 1 300 MPa
Luft- und Raumfahrt - Hochwarmfeste Legierung FE-PA2601 - Weichgeglüht und
kaltverfestigt - Stangen zum Stauchen für Verbindungselemente - D ≤ 50 mm - 1 100
MPa ≤ Rm ≤ 1 300 MPa
Série aérospatiale - Alliage résistant à chaud FE-PA2601 - Adouci et écroui - Barres
pour éléments de fixations forgés - D ≤ 50 mm - 1 100 MPa ≤ Rm ≤ 1 300 MPa
Ta slovenski standard je istoveten z: EN 3761:2020
ICS:
49.025.05 Železove zlitine na splošno Ferrous alloys in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3761
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2020
EUROPÄISCHE NORM
ICS 49.025.05
English Version
Aerospace series - Heat resisting alloy FE-PA2601 -
Softened and cold worked - Bar for forged fasteners - D ≤
50 mm - 1 100 MPa ≤ Rm ≤ 1 300 MPa
Série aérospatiale - Alliage résistant à chaud FE- Luft- und Raumfahrt - Hochwarmfeste Legierung FE-
PA2601 - Adouci et écroui - Barre pour éléments de PA2601 - Weichgeglüht und kaltverfestigt - Stange zum
fixations forgés - D ≤ 50 mm - 1 100 MPa ≤ Rm ≤ 1 300 Stauchen für Verbindungselemente - D ≤ 50 mm - 1
MPa
100 MPa ≤ Rm ≤ 1 300 MPa
This European Standard was approved by CEN on 14 July 2019.

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, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3761:2020 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 . 8

European foreword
This document (EN 3761:2020) 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 document shall be given the status of a national standard, either by publication of an identical text
or by endorsement, at the latest by July 2020, and conflicting national standards shall be withdrawn at
the latest by July 2020.
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 respons
...