GB/T 14992-2025 Superalloys and intermetallic compounds—Designation and chemical composition English, Anglais, Englisch, Inglés, えいご
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ICS 77.140.99 CCS H57
People's Republic of China National Standard
GB/T 14992-2025
Replacing GB/T 14992-2005
Superalloys and intermetallic compounds-Designation and chemical composition
Issued on August 29, 2025
Implemented on March 1, 2026
Issued by State Administration for Market Regulation
Standardization Administration of China
Contents
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Designation rules and methods
6 Designation representation and application
7 Unified digital code system
8 General rules for determining significant digits of chemical composition
9 Designation, unified digital codes, chemical composition, and application
Superalloys and intermetallic compounds-Designation and chemical composition
1 Scope
This document specifies the classification, designation rules and methods, designation representation, unified digital code system, and designations with their chemical compositions for superalloys and intermetallic compound high-temperature materials.
This document serves as a guideline for the formulation and revision of product standards and technical agreements for wrought superalloys, equiaxed cast superalloys, directionally solidified columnar cast superalloys, single-crystal cast superalloys, additively manufactured superalloys, powder metallurgy superalloys, dispersion-strengthened superalloys, welding consumable superalloys, and intermetallic compound high-temperature materials.
This document does not apply independently as ordering technical requirements for superalloy and intermetallic compound high-temperature material products.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies; for undated references, the latest edition (including any amendments) applies.
GB/T 17616 Unified digital code system for designations of iron and steel
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Superalloy
An alloy based on iron, nickel, chromium, or cobalt, capable of long-term service at temperatures above 600°C under stress, with excellent high-temperature strength, oxidation resistance, thermal corrosion resistance, fatigue performance, and fracture toughness.
3.2 Intermetallic compound high-temperature materials
High-temperature materials based on intermetallic compounds, capable of maintaining superior performance at elevated temperatures.
4 Classification
4.1 Superalloy classification
Based on base elements, superalloys are classified into four types: iron-based (iron-nickel-based), nickel-based, chromium-based, and cobalt-based.
Based on primary strengthening mechanisms, they are categorized into solid-solution-strengthened and age-hardenable superalloys.
Based on forming methods or special applications, they are classified into wrought superalloys, equiaxed cast superalloys, directionally solidified columnar cast superalloys, single-crystal cast superalloys, powder metallurgy superalloys, dispersion-strengthened superalloys, additively manufactured superalloys, and welding consumable superalloys.
4.2 Intermetallic compound high-temperature material classification
Based on intermetallic compound composition, they are classified into nickel-aluminum-based and titanium-aluminum-based intermetallic compound high-temperature materials.
5 Designation Rules and Naming Methods
5.1 Designation Rules
5.1.1 High-temperature alloys and intermetallic high-temperature materials that have undergone research, trial production, and official evaluation by competent authorities before transitioning to mass production, as well as alloys or materials officially approved for development with stable production processes and supply availability, shall apply for designation registration through the primary production or development unit to the designated standards authority.
5.1.2 During the research and trial production stages, high-temperature alloys and intermetallic high-temperature materials may be designated according to the naming methods specified in this document.
5.2 Naming Methods
5.2.1 Designation Structure
The designations for high-temperature alloys and intermetallic high-temperature materials shall be represented by a combination of Chinese phonetic alphabet letters and Arabic numerals, with no spaces between letters and numbers. The general structure is shown in Figure 1.
5.2.4 Number
A two- or three-digit Arabic numeral is used to designate different designations within the same material category.
5.2.5 Suffix
When required, English letters may be used to indicate specific processing methods or chemical compositions for a particular designation.
6 Designation Representation and Application
6.1 Designations for high-temperature alloys and intermetallic high-temperature materials shall be formulated according to the following rules:
a) Wrought high-temperature alloys, additive-manufactured high-temperature alloys, welding-grade high-temperature alloys, powder metallurgy high-temperature alloys, and dispersion-strengthened high-temperature alloys:
A four-digit number follows the prefix.
The first digit indicates the classification number.
The second to fourth digits represent the designation number.
If the designation number has fewer than three digits, it shall be padded with "0" (placed between the first digit of the classification number and the designation number).
b) Cast high-temperature alloys:
A three- or four-digit Arabic numeral follows the prefix.
The first digit indicates the classification number.
The second to fourth digits represent the designation number.
If the designation number has fewer than three digits, it shall be padded with "0" (placed between the first digit of the classification number and the designation number).
c) Intermetallic high-temperature materials:
A four-digit Arabic numeral follows the prefix.
The first digit indicates the classification number.
The second to fourth digits represent the designation number.
If the designation number has fewer than three digits, it shall be padded with "0" (placed between the first digit of the classification number and the designation number).
