EN 3668:2006
(Main)Aerospace series - Heat resisting alloy NI-PH2301 (NiCr21Fe18Mo9) - Non heat treated - Forging stock - a or D ≤ 250 mm
Aerospace series - Heat resisting alloy NI-PH2301 (NiCr21Fe18Mo9) - Non heat treated - Forging stock - a or D ≤ 250 mm
This standard specifies the requirements relating to:
Heat resisting alloy NI-PH2301 (NiCr21Fe18Mo9)
Non heat treated
Forging stock
a or D ≤ 250 mm
for aerospace applications.
Luft- und Raumfahrt - Hochwarmfeste Legierung NI-PH2301 (NiCr21Fe18Mo9) - Nicht wärmebehandelt - Schmiedevormaterial - a oder D ≤ 250 mm
Diese Norm legt die Anforderungen an
Hochwarmfeste Legierung NI-PH2301 (NiCr21Fe18Mo9)
Nicht wärmebehandelt
Schmiedevormaterial
a oder D ≤ 250 mm
für Anwendungen in der Luft- und Raumfahrt fest.
Série aérospatiale - Alliage résistant à chaud NI-PH2301 (NiCr21Fe18Mo9) - Non traité - Produits destinés à la forge - a ou D ≤ 250 mm
Aeronavtika - Zlitina NI-PH2301 (NiCr21Fe18Mo9), odporna proti vročini - Toplotno neobdelana - Material za kovanje - a ali D ≤ 250 mm
General Information
- Status
- Published
- Publication Date
- 19-Dec-2006
- Withdrawal Date
- 19-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 3668:2006 is a CEN (European) aerospace material standard that specifies requirements for the heat resisting alloy NI-PH2301 (NiCr21Fe18Mo9) in non heat treated forging stock form, with a or D ≤ 250 mm. Prepared under ASD‑STAN and adopted by CEN in December 2006, this standard defines chemical composition limits, mechanical property minima, production and inspection requirements, and delivery condition coding for aerospace use.
Key topics and requirements
- Material designation: NI‑PH2301 (NiCr21Fe18Mo9).
- Form & dimensions: Forging stock; maximum section a or diameter D ≤ 250 mm.
- Delivery condition: Non heat treated (delivery code U).
- Melting method: Consumable electrode remelted.
- Chemical composition (typical limits):
- Nickel base, Cr ~20.5–23.0%, Fe ~17.0–20.0%, Mo ~8.0–10.0% plus controlled limits for C, Si, Mn, P, S, Al, Co, Ti, W.
- Mechanical properties (minimums):
- Proof stress Rp0.2 ≥ 270 MPa
- Tensile strength Rm ≥ 690 MPa
- Elongation A ≥ 30%
- Hardness ≤ 255 HB
- High-temperature rupture (typical test):
- Test at 815 °C for tR ≥ 23 h: rupture stress σR = 110 MPa and elongation at rupture ≥ 8% (proportional test piece).
- Inspection & qualification: External/internal defect, macrostructure and dimensional inspections per EN 2860-2; product qualification per EN 2043 to be agreed between manufacturer and purchaser.
- Reference heat treatment (for reference/testing): Solution treat at 1 175 °C ± 10 °C for ≥ 20 min, air cool or faster (note: delivery to customer is non heat treated).
Applications and users
EN 3668:2006 is intended for use in aerospace materials selection, procurement, and quality assurance where a nickel‑based, heat‑resisting forging stock is required. Typical users include:
- Aerospace component manufacturers and forgings suppliers
- Materials and metallurgical engineers specifying high‑temperature alloys
- Procurement and quality/inspection teams ensuring compliance with aerospace standards
- Certification bodies and contractors involved in product qualification
The alloy is suited for aerospace components exposed to elevated temperatures where corrosion and creep resistance are required; the standard ensures consistent chemistry and mechanical performance for forging stock up to 250 mm.
Related standards
- EN 2043 - General requirements for semi‑finished product qualification
- EN 2860-2 - Heat resisting alloys - Forging stock and forgings - Part 2: Forging stock
- EN 4258 - Organization of aerospace metallic material standards
- EN 4500-3 - Rules for drafting heat resisting alloy standards
Keywords: EN 3668:2006, NI‑PH2301, NiCr21Fe18Mo9, heat resisting alloy, forging stock, aerospace materials, non heat treated.
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Frequently Asked Questions
EN 3668:2006 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Heat resisting alloy NI-PH2301 (NiCr21Fe18Mo9) - Non heat treated - Forging stock - a or D ≤ 250 mm". This standard covers: This standard specifies the requirements relating to: Heat resisting alloy NI-PH2301 (NiCr21Fe18Mo9) Non heat treated Forging stock a or D ≤ 250 mm for aerospace applications.
This standard specifies the requirements relating to: Heat resisting alloy NI-PH2301 (NiCr21Fe18Mo9) Non heat treated Forging stock a or D ≤ 250 mm for aerospace applications.
EN 3668:2006 is classified under the following ICS (International Classification for Standards) categories: 49.025.15 - Non-ferrous alloys in general. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 3668:2006 has the following relationships with other standards: It is inter standard links to EN 4258:2024, EN 4632-005:2009. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 3668:2006 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.49.025.15Neželezove zlitine na splošnoNon-ferrous alloys in generalICS:Ta slovenski standard je istoveten z:EN 3668:2006SIST EN 3668:2009en,de01-maj-2009SIST EN 3668:2009SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3668
December 2006 ICS 49.025.15 English Version
Aerospace series - Heat resisting alloy NI-PH2301 (NiCr21Fe18Mo9) - Non heat treated - Forging stock - a or D ≤ 250 mm
Série aérospatiale - Alliage résistant à chaud NI-PH2301 (NiCr21Fe18Mo9) - Non traité -Produits destinés à la forge - a ou D ≤ 250 mm
Luft- und Raumfahrt - Hochwarmfeste Legierung NI-PH2301 (NiCr21Fe18Mo9) - Nicht wärmebehandelt - Schmiedevormaterial - a oder D ≤ 250 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, 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
Management Centre: rue de Stassart, 36
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 3668:2006: ESIST EN 3668:2009
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