SIST EN 3527:2025

Aerospace series - Steel 33CrMoV12 (1.8522) - Air melted - Softened - Forging stock - a or D ≤ 300 mm

This document specifies the requirements relating to:
Steel 33CrMoV12 (1.8522)
Air melted
Softened
Forging stock
a or D ≤ 300 mm
for aerospace applications.
NOTE   ASD-STAN designation: FE-PL1504.
Material number: 1.8522.

Luft- und Raumfahrt - Stahl 33CrMoV12 (1.8522) - Lufterschmolzen - geglüht - Schmiedevormaterial - a oder D ≤ 300 mm

Dieses Dokument legt die Anforderungen an:
Stahl 33CrMoV12 (1.8522)
Lufterschmolzen
Weichgeglüht
Schmiedevormaterial
a oder D ≤ 300 mm
für Anwendungen in der Luft- und Raumfahrt fest.
ASD-STAN-Bezeichnung: FE-PL1504
Werkstoffnummer: 1.8522

Série aérospatiale - Acier 33CrMoV12 (1.8522) - Élaboré à l'air - Adouci - Produit destiné à la forge - a ou D ≤ 300 mm

Le présent document spécifie les exigences relatives à :
Acier 33CrMoV12 (1.8522)
Élaboré à l’air
Adouci
Produits destinés à la forge
a ou D ≤ 300 mm
pour les applications aérospatiales.
Désignation ASD-STAN : FE-PL1504
Numéro de matériau : 1.8522

Aeronavtika - Jeklo 33CrMoV12 (1.8522) - Taljeno - Mehčano - Material za kovanje - a ali D ≤ 300 mm

Ta dokument določa zahteve, ki se navezujejo na: jeklo 33CrMoV12 (1.8522), taljeno, mehčano, material za kovanje, a ali D ≤ 300 mm za uporabo v aeronavtiki. OPOMBA: Oznaka ASD-STAN: FE-PL1504. Številka materiala: 1.8522.

General Information

• Status: Published
• Public Enquiry End Date: 11-Sep-2024
• Publication Date: 18-Sep-2025
• ICS: 49.025.10 - Steels
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Sep-2025
• Due Date: 23-Nov-2025
• Completion Date: 19-Sep-2025
• Ref Project: EN 3527:2025 - Aerospace series - Steel 33CrMoV12 (1.8522) - Air melted - Softened - Forging stock - a or D ≤ 300 mm

Relations

• Revises: SIST EN 3527:2009 - Aerospace series - Steel FE-PL1504 (33CrMoV12) - Air melted - Softened - Forging stock - a or D ≤ 300 mm
• Effective Date: 22-May-2024

Overview

EN 3527:2025 defines the material and acceptance requirements for Aerospace series - Steel 33CrMoV12 (1.8522) supplied as air-melted, softened forging stock with section dimensions a or D ≤ 300 mm. Prepared by ASD‑STAN and approved by CEN (September 2025), this standard (ASD‑STAN designation FE‑PL1504) supersedes the earlier edition and is intended specifically for aerospace applications where repeatable chemistry, processing and mechanical performance are required.

Key topics and requirements

• Material designation: Steel 33CrMoV12 (EN material number 1.8522).
• Chemical composition (specified ranges):
  • C 0.29–0.36 %; Si ≤ 0.40 %; Mn 0.40–0.70 %; P ≤ 0.020 %; S ≤ 0.020 %
  • Cr 2.80–3.30 %; Mo 0.70–1.20 %; Ni ≤ 0.30 %; V 0.15–0.35 %; Sn ≤ 0.030 %; balance Fe
• Melting & form: Air melted; supplied as forging stock (delivery condition: softened; code U).
• Dimensional scope: Forging stock with a or D ≤ 300 mm (note: for a or D ≤ 100 mm testing can be on product or earlier manufacturing stage by agreement).
• Mechanical limits (Table 1 highlights):
  • Proof stress Rp0.2 ≥ 1 000 MPa
  • Tensile strength Rm: 1 200 < Rm < 1 350 MPa
  • Elongation A ≥ 10 %
  • Impact energy KV ≥ 40 J (notch direction T; note value in brackets KV ≥ 30 J in some cases)
  • Hardness figures are given in Table 1 (condition-dependent values)
• Heat treatment reference: Hardened and tempered reference heat treatment listed (e.g., austenitizing ~910–950 °C with oil quench and tempering ≥565 °C); nitriding note also included.
• Quality and inspection: Grain size (G ≥ 5), inclusion content Category 1, ultrasonic testing per EN 4050‑1 and visual/external inspections per EN 2157‑2. Product qualification per EN 2043; EN 2157‑2 is the applicable technical specification for forging stock.

Applications and users

• Primary users: Aerospace OEMs, manufacturers of structural and rotating components, forging houses, material suppliers, procurement and quality engineers working in aerospace supply chains.
• Typical applications: High‑strength forged components requiring tight chemistry and mechanical performance such as landing gear parts, shafts, highly stressed fittings and other safety‑critical aerospace forgings where 33CrMoV12’s alloying provides strength and hardenability.
• Why use this standard: Ensures consistent material chemistry, traceable processing (air melted, softened), defined mechanical performance, and agreed non‑destructive inspection criteria - critical for certification and interchangeability in aerospace programs.

Related standards

• EN 2157‑2 - Steel - Forging stock and forgings - Technical specification (applies to forging stock testing and sampling)
• EN 4050‑1 - Ultrasonic inspection of bars, plates, forging stock and forgings (UT requirements)
• EN 2043 - General requirements for semi‑finished product qualification
• EN 4258 and EN 4500‑005 - Series organization and rules for drafting aerospace metallic material standards

Keywords: EN 3527:2025, 33CrMoV12, 1.8522, aerospace steel, forging stock, air melted, softened, EN 2157-2, ultrasonic testing.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2025
Aeronavtika - Jeklo 33CrMoV12 (1.8522) - Taljeno - Mehčano - Material za kovanje -
a ali D ≤ 300 mm
Aerospace series - Steel 33CrMoV12 (1.8522) - Air melted - Softened - Forging stock - a
or D ≤ 300 mm
Luft- und Raumfahrt - Stahl 33CrMoV12 (1.8522) - Lufterschmolzen - geglüht -
Schmiedevormaterial - a oder D ≤ 300 mm
Série aérospatiale - Acier 33CrMoV12 (1.8522) - Élaboré à l'air - Adouci - Produit destiné
à la forge - a ou D ≤ 300 mm
Ta slovenski standard je istoveten z: EN 3527:2025
ICS:
49.025.10 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 3527
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 49.025.10 Supersedes EN 3527:2007
English Version
Aerospace series - Steel 33CrMoV12 (1.8522) - Air melted
- Softened - Forging stock - a or D  300 mm
Série aérospatiale - Acier 33CrMoV12 (1.8522) - Luft- und Raumfahrt - Stahl 33CrMoV12 (1.8522) -
Élaboré à l'air - Adouci - Produit destiné à la forge - a Lufterschmolzen - weichgeglüht -
ou D  300 mm Schmiedevormaterial - a oder D  300 mm
This European Standard was approved by CEN on 27 July 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3527:2025 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 3527:2025) 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 March 2026, and conflicting national standards shall be withdrawn
at the latest by March 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 3527 :2025.
— EN 3527 (P2), 03/2007 – update of the material designation, correction of the format of Table 1 to
comply with the requirements of the EN 4500 series, update of Clause 2, addition of a bi
...