ISO 10679:2019

Steels - Cast tool steels

This document specifies tool steel compositions for castings. NOTE Annex A gives information on ISO grade designation and available UNS numbers which are similar to the ISO grade designation.

Aciers — Aciers moulés à outil

General Information

• Status: Published
• Publication Date: 03-Sep-2019
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: ISO/TC 17/SC 11 - Steel castings
• Drafting Committee: ISO/TC 17/SC 11 - Steel castings
• Current Stage: 9060 - Close of review
• Completion Date: 04-Mar-2030

Relations

• Revises: ISO 10679:2010 - Steel - Cast tool steel
• Effective Date: 14-Jan-2017

Overview

ISO 10679:2019 - Steels - Cast tool steels specifies accepted tool steel compositions for castings. The second edition updates grade numbering and (where available) lists similar UNS cast grades in Annex A. This standard sets the baseline chemical composition, delivery information, and heat-treatment guidance for cast tool steels used in tooling, dies, molds and wear-resistant components.

Key Topics

• Scope and purpose: Defines chemical composition requirements for a wide range of cast tool-steel grades intended for manufacturing castings.
• Chemical composition (Table 1): Specifies elemental mass-fraction ranges (C, Si, Mn, P, S, Cr, Mo, Ni, V, Co, W) for each ISO grade (examples: GX100CrMoV5-1, G50CrMo12-14, GX83WMoCrV6-5-4-2). These composition limits are mandatory for conformity.
• Heat treatment (Table 2): Provides annealing temperatures and indicative Brinell hardness values for many grades. The standard notes heat treatment shall be agreed between manufacturer and purchaser; annealing data are informational.
• Purchaser information requirements: The purchaser must specify the required grade, delivery heat-treatment condition (including “as-cast” if applicable), Brinell hardness requirements if needed, machined surfaces, and part drawings or solid models.
• Delivery and marking: Materials delivered under ISO 10679 shall conform to the general technical delivery requirements in ISO 4990; marking follows ISO 4990 provisions.
• Supplementary requirements: Optional normative supplementary requirements from ISO 4990 can be applied by agreement between purchaser and manufacturer.
• Annex A (informative): Lists UNS numbers similar to ISO cast grades for cross-referencing; a note clarifies these UNS grades may not be fully equivalent.

Applications and Users

ISO 10679 is used where consistent, specified cast tool-steel compositions are required:

• Tool, die and mold manufacturers needing cast tool-steel materials for forging dies, extrusion tooling, die-casting inserts and wear parts
• Foundries producing cast tool-steel components and specifying composition and heat-treatment options
• Procurement, quality and metallurgical engineers who must verify chemical composition, hardness and delivery conditions
• Design and manufacturing teams requiring standardized grade designation and cross-references to UNS numbers

Related Standards

• ISO 4990 - Steel castings - General technical delivery requirements (normative reference for delivery, marking and supplementary requirements)
• EN 10027-1 / EN 10027-2 - Steel designation systems (referenced by Annex A grade naming)

ISO 10679:2019 helps ensure reliable selection, specification and verification of cast tool steels by standardizing composition ranges, delivery conditions and cross-references to other designation systems - improving quality control and interoperability across foundries and toolmakers.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 10679
Second edition
2019-09
Steels — Cast tool steels
Aciers — Aciers moulés à outil
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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below or ISO’s member body in the country of the requester.
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Information to be supplied by the purchaser. 1
5 General conditions for delivery . 1
6 Chemical composition . 1
7 Heat treatment . 2
8 Marking . 2
9 Supplementary requirements . 2
Annex A (informative) UNS cast grades similar to ISO cast grades . 6
Bibliography . 7
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 11, Steel
castings.
This second edition cancels and replaces the first edition (ISO 10679:2010) which has been technically
revised. It also incorporates the Technical Corrigendum ISO 10679:2010/Cor.1:2010. The main changes
compared to the previous edition are as follows:
— Grade numbers have been added to Tables 1 and 2 and Annex A;
— When available, UNS numbers have been added to Annex A.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 10679:2019(E)
Steels — Cast tool steels
1 Scope
This document specifies tool steel compositions for castings.
NOTE Annex A gives information on ISO grade designation and available UNS numbers which are similar to
the ISO grade designation.
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.
ISO 4990, Steel castings — General technical delivery requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4990 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Information to be supplied by the purchaser
The purchaser shall supply, in the enquiry and order, the following information:
a) the grade required (see Table 1);
b) the heat treatment condition, including none or as-cast, for delivery to purchaser and, if required,
Brinell hardness related to composition and heat treatment;
c) the surfaces which will be machined by the purchaser or user;
d) part drawings or solid model for each casting
...