ISO 16468:2015

INTERNATIONAL ISO
STANDARD 16468
Second edition
2015-10-01
Investment castings (steel, nickel
alloys and cobalt alloys) — General
technical requirements
Pièces moulées en cire perdue (acier, alliages de nickel et alliages de
cobalt) — Exigences techniques générales
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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 on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Materials and manufacture . 2
4.1 Melting process. 2
4.2 Remelting process . 2
5 Inspection and testing . 2
5.1 General requirements . 2
5.2 Sampling . 2
6 Retests . 8
7 Cleaning and dressing . 8
8 Quality . 8
9 Production welds . 8
10 Supplementary requirements . 8
10.1 General . 8
10.2 Agreed manufacturing procedure . 8
10.3 Magnetic particle inspection . 8
10.4 Radiographic inspection . 8
10.5 Liquid penetrant inspection . 9
10.6 Ultrasonic inspection . 9
10.7 Inspection of weld preparation . 9
10.8 Prior agreement relating to major finishing welds . 9
10.9 Impact test at low temperatures . 9
10.10 Hardness test . 9
10.10.1 Brinell . 9
10.10.2 Rockwell . 9
10.10.3 Vickers . 9
10.11 Specified ferrite range in austenitic and austenitic ferritic stainless steels . 9
10.12 Unspecified elements .10
10.13 Test material removed from castings .10
10.14 Tensile test blocks and specimen locations for castings .10
10.15 Weld maps (sketches) .10
10.16 Chemical analysis — Testing frequency .10
10.17 Tensile test — Testing frequency .10
10.18 Inspection documents .10
10.19 Marking .10
10.20 Decarburization .10
10.21 Metallurgical cleanliness .10
Bibliography .12
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
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
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
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 11, Steel castings.
This second edition replaces the first edition (ISO 16468:2005), which has been technically revised
with the following changes:
— Clause 2, two standards added;
— 3.3, revised;
— 3.4, deleted;
— 10.6, reference made to ISO 4992-1 and ISO 4992-2.
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 16468:2015(E)
Investment castings (steel, nickel alloys and cobalt
alloys) — General technical requirements
1 Scope
This International Standard specifies technical requirements for castings (steel, nickel alloys, and
cobalt alloys) produced by the investment-casting process. The International Standards specifying
metallurgical material requirements for steel, nickel alloy, and cobalt alloy casting grades are listed in
the Bibliography.
The requirements stated in this International Standard form an integral part of the material
specification. In cases of conflict, the requirements of this specification take precedence over the
individual material specification requirements.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 4986, Steel castings — Magnetic particle inspection
ISO 4987, Steel castings — Liquid penetrant inspection
ISO 4990, Steel castings — General technical delivery requirements
ISO 4992-1, Steel castings — Ultrasonic examination — Part 1: Steel castings for general purposes
ISO 4992-2, Steel castings — Ultrasonic examination — Part 2: Steel castings for highly stressed components
ISO 4993, Steel castings — Radiographic inspection
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO
...