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GB/T 25932-2025Cast superalloy — Master alloys — Equiaxed crystal (English PDF)

铸造高温合金母合金等轴晶

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2025

Implementation date

March 1, 2026

Scope

GB/T 25932-2025 is the English-translated version of 铸造高温合金母合金等轴晶.

GB/T 25932-2025 is the Chinese national standard covering the remelt stock that a foundry pours into a precision investment casting — the grades and their chemical composition, the mechanical properties of the cast test bar, the electron vacancy number that predicts whether brittle topologically close-packed phases will form in service, the slag float test and its area limit, the surface condition and the shrinkage cavity left by the ingot, and the inspection and certification. It replaces GB/T 25932-2010, under the China Iron and Steel Association. In force from 1 March 2026. Issued on 29 August 2025, it has been in force since 1 March 2026, replacing GB/T 25932-2010.

Document preview — GB/T 25932-2025

National Standard of the People's Republic of China

ICS: 77.140.20
Classification: H 44
Replacing: GB/T 25932-2010

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 Order details
5 Manufacturing process
5.1 Materials and Smelting Methods
5.1.1 Raw materials
5.1.2 Smelting Method
5.2 Delivery Status
6 Technical Requirements
6.1 Grade and Chemical Composition
6.2 Mechanical Properties
6.3 Number of electron vacancies
6.4 Scum
6.5 Surface Quality
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Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.

This document supersedes GB/T 25932-2010 "General Technical Conditions for Casting High-Temperature Alloy Master Alloys" and GB/T 31309-2020 "Casting..." "Method for Calculating Electron Vacancy Numbers in High-Temperature Alloys". This document is based on GB/T 25932-2010 and integrates the content of GB/T 31309-2020.

Compared with GB/T 25932-2010, the main technical changes are as follows, apart from structural adjustments and editorial modifications.

a) Added 49 grades of equiaxed crystal casting high-temperature alloy master alloys and related technical requirements (see Chapter 6);

b) A method for calculating the number of electron vacancies in cast high-temperature alloys has been added (see Appendix A).

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Iron and Steel Association.

This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).

This document was drafted by: Beijing Steel Research Institute of Advanced Technology Co., Ltd., Beijing Institute of Aeronautical Materials Co., Ltd., and Ansteel Technology.

Joint-stock company, Hebei Steel Research Institute Dekai Technology Co., Ltd., Metallurgical Industry Information and Standardization Research Institute, Jiangsu Longda Superalloy Aviation Materials Co., Ltd.

Jiangsu Metering Special Alloy Co., Ltd., Beijing Beiye Functional Materials Co., Ltd., Jiangsu Qina New Materials Technology Co., Ltd., and Shanxi Dongruitai New Materials Technology Co., Ltd.

The main drafters of this document are: Wu Baoping, Wang Kai, Zhang Huaxia, Zhang Chunxiao, Yan Chengming, Chen Huixia, Wang Bo, Li Zhigang, Li Huiwei, and Jin Kaifeng.

Ma Zhonggang, Chen Linjun, Li Liang, Wang Zhen, Zhao Wenqian, Yu Lianxu, Wang Lin.

The release history of this document and the document it replaces is as follows.

— First published in 2010 as GB/T 25932-2010;

— This is the first revision, incorporating the content of GB/T 31309-2020.

1 Scope

This document specifies the ordering details, manufacturing process, technical requirements, inspection rules, packaging, and marking of cast high-temperature alloy equiaxed crystal master alloys.

The quality certificate, transportation, and storage procedures describe the corresponding test methods.

This document applies to equiaxed master alloys (hereinafter referred to as master alloys) of cast high-temperature alloys for general precision castings.

2 Normative references

GB/T 223

GB/T 228.1

GB/T 228.2

GB/T 229

GB/T 230.1

GB/T 2039

GB/T 11261

GB/T 20123

GB/T 20127

GB/T 34209

GB/T 38939

GB/T 45447

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined.

4 Order details

Contracts or orders placed in accordance with this document should include the following.

a) This document number;

b) Product Name;

c) Alloy grade;

d) Raw material acceptance standards or technical agreements.

5 Manufacturing process

5.1 Materials and Smelting Methods

5.1.1 Raw materials

5.1.1.1 The use of raw materials shall comply with the provisions of HB/Z131.

5.1.1.2 The use of recycled or reclaimed high-temperature alloy raw materials is permitted. Reclaimed high-temperature alloy raw materials shall comply with the requirements of GB/T 45447.

The specific proportion and method of use of raw materials or recycled high-temperature alloy raw materials shall be determined by the purchaser based on the technical requirements of the parts and shall be specified in the contract.

5.1.2 Smelting Method

The master alloy should be melted using vacuum induction melting, and the melting process should comply with the specifications in the dedicated process technology documents. If the buyer has special requirements, they can be provided by [the relevant authority/company].

The agreement is determined through negotiation between the supply and demand parties.

5.2 Delivery Status

The master alloy is delivered in the as-cast state.

6 Technical Requirements

6.1 Grade and Chemical Composition

The alloy grade and chemical composition shall conform to the provisions of Table 1.If the buyer has special requirements, they shall be specified in the contract.

6.2 Mechanical Properties

6.2.1 Cast test bars according to the specific process technical documents. If otherwise specified, test bars of other forms may be cast.

6.2.2 The mechanical properties of the test bar shall conform to the provisions of Table 2 and Table 3.

6.3 Number of electron vacancies

If required by the buyer, the supplier shall provide the number of electron vacancies in the alloy. Acceptance criteria shall be determined through negotiation between the supplier and the buyer and specified in the contract.

6.4 Scum

The master alloy should undergo a slag test, and the slag area percentage should not exceed 2%. When there are special requirements, they shall be determined through negotiation between the supplier and the buyer. Specify this in the contract.

6.5 Surface Quality

6.5.1 The surface should be free from inclusions and honeycomb-like defects such as adhered iron, refractory materials, and slag.

6.5.2 The primary shrinkage cavity of the master alloy should be removed, and the diameter of any remaining secondary shrinkage cavity should not exceed 10 mm. The cavity should be free of residue and contaminants. When...

When there are special requirements for the size of the alloy rod, the secondary shrinkage cavity size requirement shall be determined by the supplier and the buyer through negotiation and shall be specified in the contract.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 32 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223 · GB/T 228.2 · GB/T 2039 · GB/T 20123 · GB/T 20127

Editions of GB/T 25932

Edition	Title	Revision	Status
GB/T 25932-2025	Cast superalloy - Master alloys - Equiaxed crystal	current edition	Current
GB/T 25932-2010	General specification of superalloy master alloys for castings	previous edition	In force

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