EN 3351:2012

Aerospace series - Titanium alloy Ti-4Al-4Mo-2Sn - Solution treated and aged - Forgings - De ≤ 150 mm

This European Standard specifies the requirements relating to:  )
Titanium alloy Ti-4Al-4Mo-2Sn
Solution treated and aged
Forgings
De < or = 150 mm
for aerospace application.
NOTE   Other designation: WL: 3.7184   
   Only the chemical composition of this standard must be considered.

Luft- und Raumfahrt - Titanlegierung Ti-4Al-4Mo-2Sn - Lösungsgeglüht und ausgelagert - Schmiedestücke - De ≤ 150 mm

Diese Norm legt die Anforderungen an )
Titanlegierung Ti-4Al-4Mo-2Sn
Lösungsgeglüht und ausgelagert
Schmiedestücke
De 150 mm
zur Anwendung in der Luft- und Raumfahrt fest.
Anmerkung:   Andere gültige Bezeichnungen:
Ti550,
AECMA: TI-P63,
ASD-STAN: TI-P63001.

Série aérospatiale - Alliage de titane Ti-4Al-4Mo-2Sn - Mis en solution et revenu - Pièces forgées ou matricées - De ≤ 150 mm

Cette Norme européenne spécifie les exigences relatives à :  )
Alliage de titane Ti-4Al-4Mo-2Sn
Mis en solution et revenu
Pièces forgées ou matricées
De 150 mm
pour applications aérospatiales.
NOTE   Autre désignation :
   Ti550,   
   AECMA : TI-P63,
   ASD-STAN : TI-P63001.

Aeronavtika - Titanova zlitina Ti-4Al-4Mo-2Sn - Topilno žarjena in starana - Kovani izdelki - De ≤ 150 mm

General Information

• Status: Published
• Publication Date: 09-Oct-2012
• Withdrawal Date: 29-Apr-2013
• ICS: 49.025.30 - Titanium
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4 - Metallic
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-Oct-2012
• Completion Date: 10-Oct-2012
• Ref Project: SIST EN 3351:2014 - Aerospace series - Titanium alloy Ti-4Al-4Mo-2Sn - Solution treated and aged - Forgings - De ≤ 150 mm

Overview - EN 3351:2012 (Titanium alloy Ti-4Al-4Mo-2Sn, forgings)

EN 3351:2012 is a European aerospace material standard published by CEN that specifies requirements for titanium alloy Ti-4Al-4Mo-2Sn in the form of solution treated and aged forgings with an external diameter (De) ≤ 150 mm. It is intended for aerospace applications and links to ASD‑STAN and common alloy designations (e.g., Ti550, AECMA: TI‑P63, WL 3.7184). The standard emphasizes chemical composition as a primary control and defines delivery conditions, heat treatment, mechanical properties and microstructure expectations.

Key topics and technical requirements

• Material and designation
  • Alloy: Ti‑4Al‑4Mo‑2Sn (also Ti550 / TI‑P63).
  • Form: forgings produced from forging stock.
  • Maximum diameter: De ≤ 150 mm.
  • Note: the standard highlights that the chemical composition is a principal element to be considered.
• Chemical composition (typical limits)
  • Al: 3.0–5.0%, Mo: 3.0–5.0%, Sn: 1.5–2.5%, Si ≤ 0.7%
  • Interstitials/impurities: O ≤ 0.25%, N ≤ 0.03%, H ≤ 0.012%, Fe ≤ 0.20%, C ≤ 0.08%, Others ≤ 0.10%
  • Titanium: balance.
• Melting and production
  • Melting quality: Quality Grade 2 per EN 4800‑005.
  • Production: forged from approved forging stock (EN 4800‑005 / EN 4800‑006).
• Heat treatment / delivery condition
  • Solution treat: 880–920 °C, t ≥ 20 min, air cool (AC).
  • Age: 490–510 °C, t = 24 h, air cool (AC).
  • Delivery condition code: U a.
• Mechanical properties
  • Proof stress Rp0.2: ≥ 920 MPa (De ≤ 100 mm) / ≥ 870 MPa (100 < De ≤ 150 mm).
  • Tensile strength Rm: 1 050–1 220 MPa (smaller forgings) / 1 000–1 220 MPa (larger).
  • Elongation A: ≥ 9%; Reduction of area Z: ≥ 20%.
• Microstructure
  • Alpha–beta derived: equiaxed and/or elongated primary alpha in transformed beta; no continuous alpha network at prior grain boundaries is acceptable.

Practical applications and users

EN 3351:2012 is used by:

• Aerospace OEMs and tier suppliers specifying high‑strength titanium forgings for airframe and engine components.
• Forging manufacturers and heat‑treatment shops producing Ti‑4Al‑4Mo‑2Sn parts (De ≤ 150 mm).
• Materials and quality engineers for incoming inspection, testing and acceptance criteria.
• Purchasing and certification teams who define procurement and qualification programs (qualification to be agreed between manufacturer and purchaser).

Related standards

• EN 4800‑005, EN 4800‑006 (forging stock & forgings technical specs)
• EN 2954‑002 (macrostructure)
• EN 4258, EN 4500‑004, EN 2032‑2 (series organization and drafting rules)

EN 3351:2012 is a focused specification for high‑strength titanium forgings in aerospace, combining clear chemical limits, heat treatments and mechanical expectations to ensure consistent performance in critical applications.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.49.025.30TitanTitaniumICS:Ta slovenski standard je istoveten z:EN 3351:2012SIST EN 3351:2014en01-marec-2014SIST EN 3351:2014SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3351
October 2012 ICS 49.025.30 English Version
Aerospace series - Titanium alloy Ti-4Al-4Mo-2Sn - Solution treated and aged - Forgings - De ≤ 150 mm
Série aérospatiale - Alliage de titane Ti-4Al-4Mo-2Sn - Mis en solution et revenu - Pièces forgées ou matricées - De ≤ 150 mm
Luft- und Raumfahrt - Titanlegierung Ti-4Al-4Mo-2Sn - Lösungsgeglüht und ausgelagert - Schmiedestücke - De ≤ 150 mm This European Standard was approved by CEN on 23 June 2012.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3351:2012: ESIST EN 3351:2014
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