EN ISO 683-3:2022/prA1
(Amendment)Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening steels - Amendment 1 (ISO 683-3:2022/DAM 1:2026)
General Information
- Abstract
- Status
- Not Published
- Publication Date
- 12-Mar-2028
- Current Stage
- 4020 - Submission to enquiry - Enquiry
- Start Date
- 20-Aug-2026
- Completion Date
- 20-Aug-2026
Overview
EN ISO 683-3:2022/prA1 is the draft Amendment 1 to the international standard for heat-treatable steels, alloy steels, and free-cutting steels - specifically focusing on case-hardening steels. Developed by CEN and ISO/TC 17/SC 4, this amendment updates ISO 683-3:2022 and introduces key changes to definitions, heat treatment conditions, and technical requirements for case-hardening steels widely used in the manufacturing and engineering sectors.
The amendment brings precise additions and clarifications to heat treatment terminology, revised requirements for product forms and machinability, and new provisions for hardness verification. These updates enhance the standard's relevance for both manufacturers and users, supporting quality assurance and process optimization in steel production and downstream applications.
Key Topics
Addition of Rapid Cooled and Tempered (+RCT) Treatment:
- Defines "+RCT" as heat treatment involving rapid cooling followed by tempering, resulting in a ferritic matrix with homogeneously distributed tempered martensitic or bainitic phases.
- "+RCT" is now included alongside existing delivery conditions such as soft-annealed, normalized, and treated to hardness range.
Updated Definitions and Terms:
- New and revised terms under clause 3, enhancing clarity for users.
- Specific definitions ensure correct application in technical communications and procurement.
Changes in Product Condition Requirements:
- The inclusion of "+RCT" in product form and delivery condition tables, such as Table 1, expanding accepted treatment methods.
- Hardness and machinability updates reflect modern manufacturing practices.
Revised Verification and Testing Protocols:
- Hardness verification for products in "+RCT" condition now falls under ISO 6506-1.
- QA protocols align with industry best practices and regulatory expectations.
Applications
EN ISO 683-3:2022/prA1 is essential for industries relying on case-hardening steels, such as:
Automotive manufacturing:
- Gears, shafts, and transmission components that require high surface hardness and fatigue resistance.
Mechanical engineering:
- Machine parts and tools exposed to cyclic stresses and wear.
Aerospace components:
- Lightweight but durable assemblies needing precise control over steel properties.
General steel production and supply:
- Ensures reliable product specifications for steel producers, distributors, and users.
With the inclusion of the "+RCT" treatment condition and updated technical tables, manufacturers can optimize production processes for specific mechanical properties and improved machinability. The amendment also supports procurement departments in drafting precise material specifications that comply with the latest industry norms.
Related Standards
When working with EN ISO 683-3:2022/prA1, it is useful to consider the following related international standards:
ISO 6506-1:
- Specifies the Brinell hardness test method for metallic materials, now referenced for the "+RCT" condition.
EN ISO 4954:
- Covers steel products intended for cold heading and cold extrusion, with references to annealed conditions.
Other Parts of EN ISO 683 Series:
- Standards defining requirements for other classes of heat-treatable, alloy, and free-cutting steels.
These standards together provide a robust framework for consistent quality, compliance, and interoperability in international steel supply chains.
Keywords:
EN ISO 683-3:2022/prA1, case-hardening steels, heat-treatable steels, alloy steels, free-cutting steels, rapid cooled and tempered, +RCT, steel standard amendment, hardness verification, Brinell hardness, machinability, steel manufacturing standards, CEN, ISO 683 series.
Relations
- Effective Date
- 15-Apr-2026
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Frequently Asked Questions
EN ISO 683-3:2022/prA1 is a draft published by the European Committee for Standardization (CEN). Its full title is "Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening steels - Amendment 1 (ISO 683-3:2022/DAM 1:2026)". This standard covers: Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening steels - Amendment 1 (ISO 683-3:2022/DAM 1:2026)
Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening steels - Amendment 1 (ISO 683-3:2022/DAM 1:2026)
EN ISO 683-3:2022/prA1 is classified under the following ICS (International Classification for Standards) categories: 77.140.10 - Heat-treatable steels; 77.140.20 - Stainless steels. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 683-3:2022/prA1 has the following relationships with other standards: It is inter standard links to EN ISO 683-3:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 683-3:2022/prA1 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)
SLOVENSKI STANDARD
01-oktober-2026
Toplotno obdelana, legirana in avtomatna jekla - 3. del: Cementacijska jekla -
Dopolnilo A1 (ISO 683-3:2022/DAM 1:2026)
Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening steels
- Amendment 1 (ISO 683-3:2022/DAM 1:2026)
Für eine Wärmebehandlung bestimmte Stähle, legierte Stähle und Automatenstähle -
Teil 3: Einsatzstähle - Änderung 1 (ISO 683-3:2022/DAM 1:2026)
Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 3:
Aciers pour cémentation - Amendement 1 (ISO 683-3:2022/DAM 1:2026)
Ta slovenski standard je istoveten z: EN ISO 683-3:2022/prA1
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.20 Visokokakovostna jekla Stainless steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
Amendment
ISO 683-3:2022/
DAM 1
ISO/TC 17/SC 4
Heat-treatable steels, alloy steels
Secretariat: DIN
and free-cutting steels —
Voting begins on:
Part 3:
2026-08-20
Case-hardening steels
Voting terminates on:
2026-11-12
AMENDMENT 1
Aciers pour traitement thermique, aciers alliés et aciers pour
décolletage —
Partie 3: Aciers pour cémentation
AMENDEMENT 1
ICS: 77.140.20; 77.140.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
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RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO 683-3:2022/DAM 1:2026(en)
DRAFT
ISO 683-3:2022/DAM 1:2026(en)
Amendment
ISO 683-3:2022/
DAM 1
ISO/TC 17/SC 4
Heat-treatable steels, alloy steels
Secretariat: DIN
and free-cutting steels —
Voting begins on:
Part 3:
Case-hardening steels
Voting terminates on:
AMENDMENT 1
Aciers pour traitement thermique, aciers alliés et aciers pour
décolletage —
Partie 3: Aciers pour cémentation
AMENDEMENT 1
ICS: 77.140.20; 77.140.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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BE CONSIDERED IN THE LIGHT OF THEIR
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or ISO’s member body in the country of the requester.
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Published in Switzerland Reference number
ISO 683-3:2022/DAM 1:2026(en)
ii
ISO 683-3:2022/DAM 1:2026(en)
Heat-treatable steels, alloy steels and free-cutting steels —
Part 3:
Case-hardening steels
AMENDMENT 1
Addition of heat treatment +RCT
Addition to cause 3 2 “Terms and definitions”
Change definition 3.2 to 3.3 and 3.3 to 3.4 and add a new definition 3.2 with following wording:
3.2
rapid cooled and tempered (+RCT)
heat treatment first by rapid cooling and followed by tempering to produce a ferritic matrix with
homogeneously distributed high tempered martensitic/bainitic phase
Change to 6.3.2 “Particular heat-treatment conditions”
Replace “row numbers 3 to 8” by “row numbers 3 to 9”
Change to 7.2 “Machinability”
Replace first sentence by “All steels are machinable in the conditions “soft-annealed”, “treated to hardness
range”, “treated to ferrite/pearlite structure”, “normalized” and “rapid cooled and tempere
...