Nickel and nickel alloy castings

This document specifies requirements for nickel and nickel alloy castings. The grades specified represent types of alloys suitable for a broad range of application in a wide variety of corrosive and high temperature environments.

Pièces moulées en nickel et alliages de nickel

General Information

Status
Published
Publication Date
04-Mar-2019
Current Stage
6060 - International Standard published
Start Date
07-Feb-2019
Completion Date
05-Mar-2019
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ISO 12725:2019 - Nickel and nickel alloy castings
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INTERNATIONAL ISO
STANDARD 12725
Second edition
2019-03
Nickel and nickel alloy castings
Pièces moulées en nickel et alliages de nickel
Reference number
ISO 12725:2019(E)
ISO 2019
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ISO 12725:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

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
ii © ISO 2019 – All rights reserved
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ISO 12725:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Alloy identification ............................................................................................................................................................................................. 1

5 General requirements for delivery .................................................................................................................................................... 1

5.1 Information to be supplied by the purchaser ............................................................................................................... 1

5.2 Additional information to be supplied ............................................................................................................................... 2

6 Manufacture .............................................................................................................................................................................................................. 2

6.1 Melting ........................................................................................................................................................................................................... 2

6.2 Heat treatment ........................................................................................................................................................................................ 2

6.3 Welding .......................................................................................................................................................................................................... 2

6.3.1 General...................................................................................................................................................................................... 2

6.3.2 Restriction ............................................................................................................................................................................. 2

7 Requirements .......................................................................................................................................................................................................... 2

7.1 Composition .............................................................................................................................................................................................. 2

7.2 Mechanical properties ...................................................................................................................................................................... 5

7.3 Supplementary requirements .................................................................................................................................................... 5

8 Marking .......................................................................................................................................................................................................................... 6

9 Supplementary requirements ................................................................................................................................................................ 6

Annex A (informative) Rules for nickel and nickel alloys identification based on chemical

symbols .......................................................................................................................................................................................................................... 7

Annex B (informative) Supplementary requirements ....................................................................................................................... 9

Bibliography .............................................................................................................................................................................................................................12

© ISO 2019 – All rights reserved iii
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ISO 12725:2019(E)
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 of the voluntary nature of standards, the meaning of ISO specific terms and

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 155, Nickel and nickel alloys.

This second edition cancels and replaces the first edition (ISO 12725:1997) which has been technically

revised. The main changes compared with the previous edition are as follows:
— the normative references have been updated;
— Clause 5, “General requirements for delivery”, has been added.

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
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INTERNATIONAL STANDARD ISO 12725:2019(E)
Nickel and nickel alloy castings
1 Scope
This document specifies requirements for nickel and nickel alloy castings.

The grades specified represent types of alloys suitable for a broad range of application in a wide variety

of corrosive and high temperature environments.
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 6372, Nickel and nickel alloys — Terms and definitions

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 6372 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 Alloy identification

For the purposes of this document, the principles for alloy identification are as given in Annex A.

5 General requirements for delivery
5.1 Information to be supplied by the purchaser
The enquiry and order should include the following information.

a) A description of the casting(s) by pattern number and/or drawing. When a pattern is supplied, a

complete list of the pattern equipment should be included. When a drawing is not supplied, the

casting is purchased on the basis of the pattern. In this case, the foundry shall not be responsible

for the dimensions of the part.

NOTE Machining allowances, dimensional tolerances, and geometrical tolerances can be selected from

ISO 8062-3.

All modifications to be made to the drawing, for the technical requirements of the manufacturer,

shall be agreed between the manufacturer and the purchaser.
b) The material standard, delivery condition and grade.
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ISO 12725:2019(E)
5.2 Additional information to be supplied

Where appropriate, the enquiry and order should include additional information, for example:

a) any supplementary requirements in accordance with Annex B;

b) the non-destructive testing procedures to be used, the extent of the non-destructive testing and

the acceptance criteria;
c) the type of inspection document to be provided at the time of supply;
d) the size of a test lot, (see B.2.2);

e) the procedures for marking (in accordance with Clause 8), machining, protection, packaging,

loading, dispatching and the destination;

f) the submission of sample castings for approval before production quantities are produced;

g) the methods of statistical control to be used.
6 Manufacture
6.1 Melting

Nickel and nickel alloys shall be melted by the electric furnace process with or without separate

refining, such as argon-oxygen decarburization (AOD) or by the vacuum induction melting process.

6.2 Heat treatment

Castings shall be heat treated in accordance with the procedures given in Table 1.

6.3 Welding
6.3.1 General

Selection of welding material, which shall be compatible with the casting composition, is generally left

to the discretion of the manufacturer. However, as a supplementary requirement, selection of weld

material may be agreed between the manufacturer and the purchaser.

NOTE ISO 11970 gives terms and definitions used for welding purposes for steel castings.

6.3.2 Restriction
Castings made from grades NC2000 and NC4030 shall not be welded.
7 Requirements
7.1 Composition

Materials shall conform to the chemical composition requirements given in Table 2.

The methods of determination of the chemical composition shall be at the discretion of the

manufacturer. However, in cases of dispute, the method specified in an appropriate document shall be

used. If no International Standard exists, an analytical method appropriately validated and acceptable

by the purchaser shall be used.
2 © ISO 2019 – All rights reserved
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ISO 12725:2019(E)
Table 1 — Heat treatment for nickel and nickel alloy castings
Alloy identification
Heat treatment
Number Description
NC2100 C-Ni99, -HC As cast.
NC4020 C-NiCu30Si As cast.
NC4135 C-NiCu30 As cast.
NC4030 C-NiCu30Si3 As cast.
NC4130 C-NiCu30Nb2Si2 As cast.

NC0012 C-NiMo31 Heat to 1 095 °C minimum, hold for sufficient time to bring castings

to temperature and quench in water or rapid cool by other means.

NC0007 C-NiMo30Fe5 Heat to 1 095 °C minimum, hold for sufficient time to bring castings

to temperature and quench in water or rapid cool by other means.

NC6985 C-NiCr22Fe20Mo7Cu2 Heat to 1 095 °C minimum, hold for sufficient time to bring castings

to temperature and quench in water or rapid cool by other means.

NC6625 C-NiCr22Mo9Nb4 Heat to 1 175 °C minimum, hold for sufficient time to bring castings to

temperature and quench in water or rapid cool by other means.

NC6455 C-NiCr16Mo16 Heat to 1 175 °C minimum, hold for sufficient time to bring castings to

temperature and quench in water or rapid cool by other means.

NC0002 C-NiMo17Cr16Fe6W4 Heat to 1 175 °C minimum, hold for sufficient time to bring castings to

temperature and quench in water or rapid cool by other means.
NC6022 C-NiCr21Mo14Fe4W3 Heat to 1 205 °C m
...

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