SIST EN ISO 683-3:2022/oprA1:2026
(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
- Public Enquiry End Date
- 30-Oct-2026
- Technical Committee
- IFEK - Ferrous metals
- Current Stage
- 4020 - Public enquire (PE) (Adopted Project)
- Start Date
- 04-Sep-2026
- Due Date
- 22-Jan-2027
Overview
SIST EN ISO 683-3:2022/oprA1:2026 is an amendment to the internationally harmonized standard concerning heat-treatable steels, alloy steels, and free-cutting steels, specifically addressing case-hardening steels. This amendment incorporates new updates to the classification, definition, and treatment conditions of case-hardening steels to ensure alignment with industry advancements and improve material performance across various applications.
Developed in cooperation with ISO and CEN, and managed by the Slovenian Institute for Standardization (SIST), this document is closely related to ISO 683-3:2022. It is intended for use in industrial, technological, and commercial sectors where heat-treatable and case-hardening steels are integral to manufacturing, engineering, and mechanical applications.
Key Topics
Addition of Heat Treatment +RCT:
The amendment introduces the new condition "rapid cooled and tempered" (+RCT). This heat treatment involves rapid cooling followed by tempering, resulting in a ferritic matrix with well-distributed, highly tempered martensitic or bainitic phases.- This treatment enhances both mechanical properties and performance for case-hardening steels.
Expanded Definitions and Terminology:
Updated terms and definitions structure to include the new +RCT process, ensuring clarity and consistency in technical communication.Modifications in Product and Treatment Tables:
The amendment updates the tables for:- Usual heat-treatment conditions at delivery
- Hardness requirements for various product forms and delivery conditions
- Test conditions and verification processes for hardness, including the new +RCT condition
Machinability Improvements:
The machinability definition is updated to recognize that all steels are machinable in soft-annealed, treated to hardness range, ferrite/pearlite structure, normalized, and rapid cooled and tempered (+RCT) conditions.Harmonization with Test Methods:
Hardness for the new +RCT condition is to be verified using ISO 6506-1, ensuring uniformity in testing procedures.
Applications
This amendment is highly relevant for industries relying on case-hardening steels and other heat-treatable steel products, such as:
- Automotive manufacturing: For gears, shafts, and critical components requiring surface hardness and core toughness.
- Mechanical engineering and machinery: Where high wear resistance and precise mechanical performance are critical.
- Tool and die production: Benefiting from improved material uniformity due to advanced heat treatment processes.
- Aerospace and energy sectors: Where safety and reliability demand stringent material properties and verified performance.
By providing clear updates to heat treatment options and verification methods, the amendment supports improved process control, better end-product quality, and compliance with evolving international and regional market needs.
Related Standards
- ISO 683-3:2022: The primary standard for case-hardening steels, covering main requirements, properties, and product forms.
- ISO 6506-1: Method for Brinell hardness testing, referenced for verifying steel hardness under the updated conditions.
- SIST EN ISO 4954: Relevant for annealed steel conditions required for cold heading and extrusion.
- Standards under ICS 77.140.10 and 77.140.20: Covering other categories of heat-treatable steels and stainless steels, ensuring comprehensive specification and compatibility for various steel grades and processes.
This amendment to SIST EN ISO 683-3 advances the standardization of case-hardening steels, facilitating better materials engineering, manufacturing reliability, and seamless integration into global supply chains.
Relations
- Effective Date
- 15-Apr-2026
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Frequently Asked Questions
SIST EN ISO 683-3:2022/oprA1:2026 is a draft published by the Slovenian Institute for Standardization (SIST). 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)
SIST EN ISO 683-3:2022/oprA1:2026 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.
SIST EN ISO 683-3:2022/oprA1:2026 has the following relationships with other standards: It is inter standard links to SIST EN ISO 683-3:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 683-3:2022/oprA1:2026 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
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STANDARDS MAY ON OCCASION HAVE TO
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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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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
...