SIST EN 4216:2026

Aerospace series - Steel GX5CrNiCuNb16-4 (1.4525) - Homogenized, solution treated and precipitation hardened - Investment casting - De ≤ 50 mm - Rm ≥ 900 MPa

This document specifies the requirements relating to:
Steel GX5CrNiCuNb16-4 (1.4525)
Homogenized
Solution treated and precipitation hardened
Investment casting
De ≤ 50 mm
Rm ≥ 900 MPa
for aerospace applications.
ASD-STAN designation FE-CM3801
Material number 1.4525

Luft- und Raumfahrt - Stahl GX5CrNiCuNb16-4 (1.4525) - Diffusionsgeglüht, lösungsgeglüht und ausscheidungsgehärtet - Feingussstücke - De ≤ 50 mm - Rm ≥ 900 MPa

Dieses Dokument legt die Anforderungen an:
Stahl GX5CrNiCuNb16 4 (1.4525)
Diffusionsgeglüht
Lösungsgeglüht und ausscheidungsgehärtet
Feingussstücke
De ≤ 50 mm
Rm ≥ 900 MPa
für Anwendungen in der Luft  und Raumfahrt fest.
ASD-STAN-Bezeichnung: FE-CM3801
Werkstoffnummer: 1.4525

Série aérospatiale - Acier GX5CrNiCuNb16-4 (1.4525) - Homogénéisé, mis en solution et durci par précipitation - Pièces moulées à la cire perdue - De ≤ 50 mm - Rm ≥ 900 MPa

Le présent document spécifie les exigences relatives à :
Série aérospatiale - Acier GX5CrNiCuNb16-4 (1.4525)
Homogénéisé
Mis en solution et durci par précipitation
Pièces moulées à la cire perdue
De ≤ 50 mm
Rm ≥ 900 MPa
pour les applications aérospatiales.
Désignation ASD-STAN : FE-CM3801
Numéro de matériau : 1.4525

Aeronavtika - Jeklo GX5CrNiCuNb16-4 (1.4525) - Homogenizirani, obdelani v raztopini in utrjeni - Precizijsko litje - De ≤ 50 mm - Rm ≥ 900 MPa

Ta dokument določa zahteve v zvezi z:
Jeklo GX5CrNiCuNb16-4 (1.4525)
Homogenizirano
Raztopinsko obdelano in utrjeno s precipitacijo
Natančno litje
De ≤ 50 mm
Rm ≥ 900 MPa
za letalske aplikacije.
ASD-STAN oznaka FE-CM3801
Materialna številka 1.4525

General Information

• Status: Published
• Public Enquiry End Date: 25-Jun-2025
• Publication Date: 07-May-2026
• ICS: 49.025.10 - Steels
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 04-May-2026
• Due Date: 09-Jul-2026
• Completion Date: 08-May-2026
• Ref Project: EN 4216:2026 - Aerospace series - Steel GX5CrNiCuNb16-4 (1.4525) - Homogenized, solution treated and precipitation hardened - Investment casting - De ≤ 50 mm - Rm ≥ 900 MPa

Relations

• Revises: SIST EN 4216:2007 - Aerospace series - Steel FE-CM3801 (GX5CrNiCuNb16-4) - Homogenized, solution treated and precipitation hardened, investment casting De <= 50 mm, Rm >= 900 MPa
• Effective Date: 19-Jan-2023

Overview

kSIST FprEN 4216:2025 is a European Standard developed by CEN that specifies the requirements for the aerospace-grade steel alloy GX5CrNiCuNb16-4 (material number 1.4525). This standard covers homogenized, solution treated, and precipitation hardened investment castings with a maximum outside diameter or thickness (De) of up to 50 mm and a required minimum tensile strength (Rm) of 900 MPa. kSIST FprEN 4216:2025 is designed for aerospace applications, aligning with the ASD-STAN designation FE-CM3801, and constitutes an essential reference for manufacturers, suppliers, and quality assurance professionals in the aerospace supply chain.

Key Topics

• Steel Designation and Composition
  The standard clearly defines the chemical composition and method of production for GX5CrNiCuNb16-4, ensuring consistency and performance across suppliers and manufacturers.

• Heat Treatment and Mechanical Properties
  It covers requirements for homogenization, solution treatment, and precipitation hardening, with focus on achieving mechanical properties such as minimum tensile strength (Rm ≥ 900 MPa) and proof stress.

• Dimensional and Qualitative Limits
  Maximum allowable dimensions (De ≤ 50 mm) and essential qualities such as microstructure, ferrite content, and hardness are established to ensure reliability in aerospace environments.

• Production Controls and Testing
  The document references necessary test methods and inspections, including visual and ultrasonic testing, microstructure analysis, and marking inspection, helping to guarantee compliance and traceability.

Applications

kSIST FprEN 4216:2025 is intended primarily for the aerospace sector, addressing demanding requirements for strength, toughness, and consistency in high-performance steel castings. Typical applications include:

• Aerospace Structural Components
  Investment cast parts such as brackets, supports, housings, and structural fittings where lightweight strength and reliability are crucial for safety and performance.

• Engine Components
  Use in engine casings or accessories requiring dimensional stability and high mechanical properties at various service temperatures.

• Landing Gear and Actuation Systems
  Parts experiencing high cyclic loads and exposure to harsh operational conditions, where precise chemical and mechanical standards are necessary.

The standard’s guidance ensures that components produced under kSIST FprEN 4216:2025 are suitable for critical aerospace applications, contributing to aircraft integrity and safety.

Related Standards

To ensure full compliance and obtain supporting technical information, the following related standards are referenced within kSIST FprEN 4216:2025:

• EN 2103-3: Aerospace series - Steel, nickel base and cobalt base alloy remelting stock and castings - Technical specifications - Part 3: Pre-production and production castings
• EN 3484: Aerospace series - Steel X5CrNiCuNb16-4 - As cast - Reference heat treatment
• EN 4436: Aerospace series - Steel - Test methods - Determination of δ ferrite content
• EN 4258: General organization of metallic materials standardization for aerospace purposes
• EN 4500-005: Rules for drafting and presentation of metallic material standards - steels

Industry professionals looking for high-strength steel investment castings for aerospace projects will find kSIST FprEN 4216:2025 and its referenced documents to be key resources for material selection, process control, and quality assurance.

Keywords: aerospace steel standard, kSIST FprEN 4216:2025, GX5CrNiCuNb16-4, 1.4525, investment casting, precipitation hardened steel, homogenized steel, aerospace quality standards, high-strength steel, mechanical properties, CEN standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2026
Aeronavtika - Jeklo GX5CrNiCuNb16-4 (1.4525) - Homogenizirani, obdelani v
raztopini in utrjeni - Precizijsko litje - De ≤ 50 mm - Rm ≥ 900 MPa
Aerospace series - Steel GX5CrNiCuNb16-4 (1.4525) - Homogenized, solution treated
and precipitation hardened - Investment casting - De ≤ 50 mm - Rm ≥ 900 MPa
Luft- und Raumfahrt - Stahl GX5CrNiCuNb16-4 (1.4525) - Diffusionsgeglüht,
lösungsgeglüht und ausscheidungsgehärtet - Feingussstücke - De ≤ 50 mm - Rm ≥ 900
MPa
Série aérospatiale - Acier GX5CrNiCuNb16-4 (1.4525) - Homogénéisé, mis en solution
et durci par précipitation - Pièces moulées à la cire perdue - De ≤ 50 mm - Rm ≥ 900
MPa
Ta slovenski standard je istoveten z: EN 4216:2026
ICS:
49.025.10 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4216
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2026
EUROPÄISCHE NORM
ICS 49.025.10 Supersedes EN 4216:2007
English Version
Aerospace series - Steel GX5CrNiCuNb16-4 (1.4525) -
Homogenized, solution treated and precipitation hardened
- Investment casting - De  50 mm - Rm  900 MPa
Série aérospatiale - Acier GX5CrNiCuNb16-4 (1.4525) - Luft- und Raumfahrt - Stahl GX5CrNiCuNb16-4
Homogénéisé - Mis en solution et durci par (1.4525) - Diffusionsgeglüht, lösungsgeglüht und
précipitation - Moulage à la cire perdue - De  50 mm - ausscheidungsgehärtet - Feingussstücke - De  50 mm -
Rm  900 MPa Rm  900 MPa
This European Standard was approved by CEN on 6 March 2026.

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, Türkiye 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4216:2026 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 . 9
European foreword
This document (EN 4216:2026) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, 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 October 2026, and conflicting national standards shall be withdrawn
at the latest by October 2026.
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 responsible for identifying any or all such patent rights.
This document supersedes EN 4216:2007.
— editorial revision;
— the titles have been updated;
— addition of a bibliography.
According to the CEN-CENELEC Internal
...