prEN 10250-3

SLOVENSKI STANDARD
01-maj-2026
Prosto kovani jekleni izkovki za splošno tehnično uporabo - 3. del: Legirana
plemenita jekla
Open die steel forgings for general engineering purposes - Part 3: Alloy special steels
Freiformschmiedestücke aus Stahl für allgemeine Verwendung - Teil 3: Legierte
Edelstähle
Pièces forgées en acier pour usage général - Partie 3: Aciers spéciaux alliés
Ta slovenski standard je istoveten z: prEN 10250-3
ICS:
77.140.20 Visokokakovostna jekla Stainless steels
77.140.85 Železni in jekleni kovani Iron and steel forgings
izdelki
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2026
ICS 77.140.85 Will supersede EN 10250-3:2022
English Version
Open die steel forgings for general engineering purposes -
Part 3: Alloy special steels
Pièces forgées en acier pour usage général - Partie 3: Freiformschmiedestücke aus Stahl für allgemeine
Aciers spéciaux alliés Verwendung - Teil 3: Legierte Edelstähle
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 459/SC 11.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

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. prEN 10250-3:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Chemical composition . 4
4.1 Cast analysis . 4
4.2 Product analysis . 4
5 Heat treatment . 4
6 Mechanical properties . 4
Annex A (informative) Heat treatment. 9
Bibliography . 10

European foreword
This document (prEN 10250-3:2026) has been prepared by Technical Committee CEN/TC 459/SC 11
“Steel castings and forgings”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document supersedes EN 10250-3:2022.
EN 10250-3:2022:
— updating of normative references;
— editorial corrections;
— updating of mechanical properties of 40CrMoV13-9;
— splitting Table 3 into Table 3a and Table 3b concerning different mechanical properties and ruling
section thickness ranges for different group of steel grades.
EN 10250, Open die steel forgings for general engineering purposes, consists of the following parts:
— Part 1: General requirements;
— Part 2: Non-alloy quality and special steels;
— Part 3: Alloy special steels;
— Part 4: Stainless steels.
1 Scope
This document specifies the technical delivery requirements for open die forgings, forged bars and
products pre-forged and finished in ring rolling mills, manufactured from alloy special steel and supplied
in the quenched and tempered condition.
The majority of steels listed in this document are identical to steels specified in EN ISO 683-1 and
EN ISO 683-2 and more extensive information on hardenability and technological properties is given in
these standards.
General information on technical delivery conditions is given in EN 10021.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 10250-1:2022, Open die steel forgings for general engineering purposes - Part 1: General requirements
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Chemical composition
4.1 Cast analysis
The chemical composition of the steel shall be determined by cast analysis and shall conform to the
analysis given in Table 1 (see EN 10250-1:2022, A.7 and A.8).
Measures should be taken to prevent the addition from the scrap, or other material used in the
manufacture of the steels, of such elements which affect the hardenability, mechanical properties and
applicability of the steel.
4.2 Product analysis
The product analysis shall not deviate from the specified cast analysis (see Table 1) by more than the
values specified in Table 2 (see EN 10250-1:2022, 9.2).
5 Heat treatment
Heat treatment details are given in Annex A, Table A.1 for guidance.
6 Mechanical properties
...