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GB/T 45981.2-2025: Heavy casting and forging for heavy-duty gas turbine - Part 2: Superalloy die forgings
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 45981.2-2025 | English | 369 |
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Heavy casting and forging for heavy-duty gas turbine - Part 2: Superalloy die forgings
| Valid |
GB/T 45981.2-2025
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Basic data | Standard ID | GB/T 45981.2-2025 (GB/T45981.2-2025) | | Description (Translated English) | Heavy casting and forging for heavy-duty gas turbine - Part 2: Superalloy die forgings | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J32 | | Classification of International Standard | 77.140.85 | | Word Count Estimation | 18,115 | | Date of Issue | 2025-08-01 | | Date of Implementation | 2026-02-01 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 45981.2-2025: Heavy casting and forging for heavy-duty gas turbine - Part 2: Superalloy die forgings
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45981.2-2025
ICS 77.140.85
CCSJ32
National Standard of the People's Republic of China
Large castings and forgings for heavy-duty gas turbines
Part 2.High temperature alloy die forgings
Part 2.Superaloydieforgings
Implementation on February 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction IV
1 Scope 1
2 Normative references 1
3 Terms and Definitions 3
4 Ordering Requirements 4
5 First Article Test 4
6 Manufacturing Process 4
6.1 Smelting 4
6.2 Forging 5
6.3 Heat treatment 5
6.4 Machining 5
6.5 Defect removal and repair welding 5
7 Technical Requirements 6
7.1 Chemical composition 6
7.2 Mechanical properties 6
7.3 Hardness 7
7.4 High-magnification tissue 8
7.5 Low-power tissue 8
7.6 Nondestructive Testing 8
7.7 Shape, size and appearance quality 9
8 Test methods 9
8.1 Test method and sampling method, quantity and location 9
8.2 Chemical composition analysis 9
8.3 Hardness test 9
8.4 Inspection of shape, size and appearance quality 10
9 Inspection Rules 10
9.1 Batch Grouping Principles 10
9.2 Retest 10
10 Acceptance and Quality Certificate 10
11 Labeling and packaging 10
Figure 1 Schematic diagram of chord direction 4
Table 1 Heat treatment system 5
Table 2 Chemical composition (mass fraction) 6
Table 3 Permissible deviation of chemical composition of GH4698 (mass fraction)
Table 4 Mechanical properties at room temperature 7
Table 5 High temperature tensile properties 7
Table 6 High temperature endurance performance 7
Table 7 Standard ultrasonic testing acceptance requirements for forgings 8
Table 8 Test method and sampling method, quantity and location 9
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is Part 2 of GB/T 45981 "Large Castings and Forgings for Heavy-Duty Gas Turbines". GB/T 45981 has been published for the following
part.
--- Part 1.Steel open die forgings;
--- Part 2.High temperature alloy die forgings;
--- Part 3.Steel castings.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Large Castings and Forgings (SAC/TC506).
This document was drafted by. China Second Heavy Machinery Group Deyang Wanhang Die Forging Co., Ltd., China Iron and Steel Research Institute Co., Ltd.
Dongfang Steam Turbine Co., Ltd., Dongfang Electric Corporation, China United Heavy Gas Turbine Technology Co., Ltd., University of Science and Technology Beijing, Fushun Special
Steel Co., Ltd., Sichuan Engineering Vocational and Technical University, Tongyu Heavy Industry Co., Ltd., and China Heavy Machinery Research Institute Co., Ltd.
The main drafters of this document are. Yang Wei, Xie Jing, Xiong Yunsen, Deng Hao, Chang Yueying, Zhang Xin, Jiang Xilai, Qin Heyong, Shu Guogang, Yu Zhiyong, Gong Xiufang,
Bai Xiaolong, Wang Chong, Li Qingsong, Jiang He, Dong Jianxin, Hou Zhiwen, Li Lianpeng, Wu Daijian, Yang Houlei, Xiao Guangshuai, and Qiu Mingjun.
introduction
Heavy-duty gas turbines are the core power equipment of energy efficient conversion and clean utilization systems and are widely used in power generation, distributed energy and electricity.
Heavy-duty gas turbine castings and forgings are the most important products of heavy-duty gas turbines.
The development foundation of the industry, with the development of heavy-duty gas turbine industry, its castings and forgings have made breakthroughs and formed a series of material systems.
To promote common benefits, it is necessary to propose material selection, ordering, manufacturing, testing methods and inspection rules for large castings and forgings used in heavy-duty gas turbines.
GB/T 45981 "Large Castings and Forgings for Heavy-Duty Gas Turbines" was formulated for this purpose.
Provide a basis for manufacturing and technical exchanges, and cultivate and enhance the material supporting capabilities of the heavy-duty gas turbine industry.
Due to the differences in materials, manufacturing and supply chains of components, GB/T 45981 is intended to consist of three parts.
--- Part 1.Steel free forgings. The purpose is to standardize the shaft head, center tie rod, compressor and turbine wheel for heavy-duty gas turbines
Manufacturing of large steel free forgings.
--- Part 2.High-temperature alloy die forgings. The purpose is to standardize high-temperature alloy large die forgings and tie rod forgings for heavy-duty gas turbines
Manufacturing of parts.
--- Part 3.Steel castings. The purpose is to standardize heavy-duty gas turbines gravity cast using sand molds or molds with thermal conductivity equivalent to sand molds
Used in the manufacture of large steel castings.
Large castings and forgings for heavy-duty gas turbines
Part 2.High temperature alloy die forgings
1 Scope
This document specifies the ordering requirements, manufacturing process, and technical requirements for high-temperature alloy large die forgings and tie rod forgings for heavy-duty gas turbines.
It describes the corresponding test methods, stipulates the inspection rules, acceptance and quality certificates, marking and packaging.
This document applies to the manufacture of high-temperature alloy large die forgings and tie rod forgings for heavy-duty gas turbines.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 223.5 Determination of acid-soluble silicon and total silicon content of iron and steel - Reduced molybdenum silico-silicic acid spectrophotometric method
GB/T 223.8 Chemical analysis methods for iron, steel and alloys - Sodium fluoride separation-EDTA titration method for the determination of aluminum content
GB/T 223.9 Iron, steel and alloys - Determination of aluminium content - Chrome azurol S spectrophotometric method
GB/T 223.11 Determination of chromium content in steel and alloys - Visual titration or potentiometric titration method
GB/T 223.17 Chemical analysis methods for iron, steel and alloys - Diantipyryl methane photometric method for the determination of titanium content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloys - Determination of copper content by the new cuproline-chloroform extraction spectrophotometric method
GB/T 223.20 Chemical analysis methods for iron, steel and alloys - Potentiometric titration for the determination of cobalt content
GB/T 223.25 Methods for chemical analysis of iron, steel and alloys - Dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.28 Methods for chemical analysis of iron, steel and alloys - α-Benzoin oxime gravimetric method for the determination of molybdenum content
GB/T 223.29 Iron, steel and alloys - Determination of lead content - Carrier precipitation-xylenol orange spectrophotometric method
GB/T 223.30 Chemical analysis methods for iron, steel and alloys - Determination of arsenazo III by spectrophotometric method using precipitation with bromomandelic acid
Zirconium content
GB/T 223.33 Chemical analysis methods for iron, steel and alloys - Extraction and separation - Chlorophosphonazo mA photometric method for the determination of cerium content
GB/T 223.37 Iron, steel and alloys - Determination of nitrogen content - Indigo blue spectrophotometric method using distillation separation
GB/T 223.38 Methods for chemical analysis of iron, steel and alloys—Ion exchange separation—Gravimetric method for the determination of niobium content
GB/T 223.42 Methods for chemical analysis of iron, steel and alloys—Ion exchange separation—The bromopyrogallol red spectrophotometric method for the determination of tantalum content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloys - Determination of phosphorus content - Spectrophotometric method with butyl acetate extraction
GB/T 223.64 Iron, steel and alloys - Determination of manganese content - Flame atomic absorption spectrometry
GB/T 223.65 Iron, steel and alloys - Determination of cobalt content - Flame atomic absorption spectrometry
GB/T 223.70 Iron, steel and alloys - Determination of iron content - 1,2-phenanthroline spectrophotometric method
GB/T 223.73 Iron, steel and alloys - Determination of iron content - Titanium trichloride-potassium dichromate titration method
GB/T 223.75 Iron, steel and alloys - Determination of boron content - Methanol distillation-curcumin photometric method
GB/T 223.80 Iron, steel and alloys—Determination of bismuth and arsenic content—Hydride generation-atomic fluorescence spectrometry
GB/T 223.85 Iron, steel and alloys - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace
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