prEN 10250-2

Open die steel forgings for general engineering purposes - Part 2: Non-alloy quality and special steels

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 non-alloy quality and special steels and supplied in the normalized, normalized and tempered, quenched and tempered or annealed condition.
The majority of steels listed in this document, with properties in the quenched and tempered condition up to 160 mm thickness, 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.

Freiformschmiedestücke aus Stahl für allgemeine Verwendung - Teil 2: Unlegierte Qualitäts- und Edelstähle

Dieses Dokument legt die technischen Lieferbedingungen für Freiformschmiedestücke, geschmiedete Stangen und Erzeugnisse, die in Ringwalzwerken vorgeschmiedet und fertiggestellt werden, die aus unlegierten Qualitäts- und Sonderstählen hergestellt und im normalisiertem und vergütetem oder geglühtem Zustand geliefert werden.
Die meisten Stähle, die in diesem Dokument mit Eigenschaften im vergüteten Zustand für bis zu 160 mm Dicke aufgeführt sind, sind mit Stählen identisch, die in ENISO683-1 und ENISO683-2 festgelegt sind. Umfassendere Angaben über die Härtbarkeit und technologische Eigenschaften werden in jenen Normen gegeben.
Allgemeine Angaben über die technischen Lieferbedingungen enthält EN10021.

Pièces forgées en acier pour usage général - Partie 2: Aciers de qualité non alliés et aciers spéciaux

Le présent document spécifie les exigences techniques de livraison des pièces obtenues par forgeage libre, des barres forgées et des produits pré-forgés et finis par laminage circulaire, fabriqués en acier de qualité non allié et en aciers spéciaux et livrés à l'état normalisé, normalisé et revenu, trempé et revenu ou recuit.
La majorité des aciers cités dans le présent document, avec des caractéristiques à l'état trempé et revenu jusqu'à une épaisseur de 160 mm, sont identiques aux aciers spécifiés dans l'EN ISO 683-1 et l'EN ISO 683-2 et des informations plus complètes sur la trempabilité et les propriétés technologiques sont données dans ces normes.
Les informations générales sur les conditions techniques de livraison sont données dans l'EN 10021.

Prosto kovani jekleni izkovki za splošno tehnično uporabo - 2. del: Nelegirana kakovostna in plemenita jekla

Ta dokument določa tehnične zahteve za dobavo prostih odkovkov, kovanih palic in izdelkov, predkovanih in dokončanih v obročnih valjarnah, izdelanih iz nelegiranih kakovostnih in posebnih jekel ter dobavljenih v normaliziranem, normaliziranem in popuščenem, kaljenem in popuščenem ali žarjenem stanju.
Večina jekel, navedenih v tem dokumentu, z lastnostmi v kaljenem in popuščenem stanju do debeline 160 mm, je enaka jeklom, določenim v EN ISO 683-1 in EN ISO 683-2, pri čemer so v teh standardih podane obsežnejše informacije o kaljivosti in tehnoloških lastnostih.
Splošne informacije o tehničnih pogojih dobave so podane v EN 10021.

General Information

• Status: Not Published
• Publication Date: 10-Jan-2028
• ICS: 77.140.45 - Non-alloyed steels
• ICS: 77.140.85 - Iron and steel forgings
• Technical Committee: ECISS/TC 111 - Steel castings and forgings
• Drafting Committee: CEN/TC 459/SC 11/WG 2 - Steel forgings
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 11-Jun-2026
• Due Date: 25-Aug-2026
• Completion Date: 11-Jun-2026
• Ref Project: oSIST prEN 10250-2:2026 - Open die steel forgings for general engineering purposes - Part 2: Non-alloy quality and special steels

Relations

• Revises: EN 10250-2:2022 - Open die steel forgings for general engineering purposes - Part 2: Non-alloy quality and special steels
• Effective Date: 07-Apr-2025

Overview

prEN 10250-2: Open Die Steel Forgings for General Engineering Purposes - Part 2: Non-alloy Quality and Special Steels is a draft European Standard developed by CEN, covering the technical requirements for open die steel forgings, forged bars, and ring-rolled products manufactured from non-alloy quality and special steels. This document addresses steel products supplied in normalized, normalized and tempered, quenched and tempered, or annealed conditions. It replaces the 2022 edition, refining steel designations, mechanical values, and technical references to ensure quality and consistency in general engineering applications.

Key Topics

• Chemical Composition: Specifies requirements for cast and product analyses, consistent with referenced standards. Manufacturers must control elemental additions to guarantee steel hardenability and property consistency.
• Heat Treatment: Outlines supply conditions, including normalization, tempering, quenching, and annealing, depending on grade and end-use.
• Mechanical Properties: Provides guidelines on tensile strength, yield strength, elongation, impact value, and hardness according to steel grade and product thickness.
• Delivery Conditions: Details on technical documentation, product compliance, and conformity to European delivery requirements.

Applications

Open die steel forgings and forged bars produced according to prEN 10250-2 are widely used in general engineering sectors where high reliability and material integrity are crucial. Typical applications include:

• Machine building: Structural components, shafts, gears, and machinery parts requiring consistent mechanical properties.
• Heavy engineering: Components for construction equipment, mining, and material handling.
• Energy sector: Supporting elements for wind turbines, generators, and other energy infrastructure.
• Transport and automotive: Critical connecting and supporting parts, where controlled properties are vital for safety and durability.
• Ring rolled products: Used in applications demanding robust circular components, such as flanges and bearings.

By adhering to this standard, end users benefit from predictable hardenability, robust mechanical performance, and traceability-essential for demanding engineering environments.

Related Standards

The requirements and guidance in prEN 10250-2 are closely related to several key international standards, promoting interoperability and streamlining procurement:

• EN 10250-1: General requirements for open die steel forgings, used in conjunction with this document for complete specification.
• EN ISO 683-1 & EN ISO 683-2: These standards provide additional details on hardenability and technological properties for non-alloy and alloy steels suitable for quenching and tempering.
• EN 10021: Lays out general technical delivery conditions for steel products, ensuring documentation and compliance.
• EN ISO 6506-1: Defines the Brinell hardness test method for applicable steel grades.
• ISO 4885: Offers terminology and vocabulary on heat treatment processes for ferrous materials.

Practical Value

Companies adopting prEN 10250-2 benefit from:

• Harmonized quality: Meeting European and international market requirements for open die steel forgings.
• Operational efficiency: Streamlined procurement and technical communication through a unified reference.
• Consistent performance: Reliable mechanical and chemical properties tailored to engineering needs.
• Enhanced compliance: Alignment with recognized CEN and ISO standards improves supplier and customer confidence.

By referencing prEN 10250-2 for non-alloy quality and special steel forgings, engineers and procurement specialists ensure their products meet demanding industry expectations for durability, safety, and traceability.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2026
Prosto kovani jekleni izkovki za splošno tehnično uporabo - 2. del: Nelegirana
kakovostna in plemenita jekla
Open die steel forgings for general engineering purposes - Part 2: Non-alloy quality and
special steels
Freiformschmiedestücke aus Stahl für allgemeine Verwendung - Teil 2: Unlegierte
Qualitäts- und Edelstähle
Pièces forgées en acier pour usage général - Partie 2: Aciers de qualité non alliés et
aciers spéciaux
Ta slovenski standard je istoveten z: prEN 10250-2
ICS:
77.140.20 Visokokakovostna jekla Stainless steels
77.140.45 Nelegirana jekla Non-alloyed 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
June 2026
ICS 77.140.45; 77.140.85 Will supersede EN 10250-2:2022
English Version
Open die steel forgings for general engineering purposes -
Part 2: Non-alloy quality and special steels
Pièces forgées en acier pour usage général - Partie 2: Freiformschmiedestücke aus Stahl für allgemeine
Aciers de qualité non alliés et aciers spéciaux Verwendung - Teil 2: Unlegierte Qualitäts- und
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 10250-2:2026 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 . 5
6 Mechanical properties . 5
6.1 Forgings in the normalized, normalized and tempered, and quenched and tempered
condition . 5
6.2 Forgings in the annealed condition (Steels C45, C55 and C60) . 5
Annex A (informative) Heat treatment. 11
Bibliography . 12
European foreword
This document (prEN 10250-2:2026) 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 will supersede EN 10250-2:2022.
In comparison with the previous edition, the following technical modifications have been made:
— updating of normative references;
— correction of wrong steel designations and steel numbers;
— modifications to mechanical values of some steel grades and their attributed wall thicknesses.
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 non-alloy quality and special
steels and supplied in the normalized, normalized and tempered, quenched and tempered or annealed
condition.
The majority of steels listed in this document, with properties in the quenched and tempered condition
up to 160 mm thickness, 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
EN ISO 683-1:2018, Heat-treatable steels, alloy steels and free-cutting steels - Part 1: Non-alloy steels for
quenching and tempering (ISO 683-1:2016)
EN ISO 6506-1, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1)
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 steel, 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 EN ISO 683-1:2018, Table 4 (see EN 10250-1:2022, 9.2).
5 Heat treatment
Heat treatment details are given in Table A.1 for guidance.
6 Mechanical properties
6.1 Forgings in the normalized, normalized and tempered, and quenched and tempered
condition
The mechanical properties determined on test pieces selected, prepared and tested in accordance with
EN 10250-1:2022, Clauses 11 and 12 shall conform to the property requirements gi
...