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GB/T 45981.2-2025Heavy casting and forging for heavy-duty gas turbine - Part 2: Superalloy die forgings (English PDF)

重型燃气轮机用大型铸锻件　第2部分：高温合金模锻件

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 1, 2025

Implementation date

February 1, 2026

Scope

GB/T 45981.2-2025 is the English-translated version of 重型燃气轮机用大型铸锻件　第2部分：高温合金模锻件.

GB/T 45981.2-2025 is the Chinese standard "Heavy casting and forging for heavy-duty gas turbine - Part 2: Superalloy die forgings".

Its scope clause reads: 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.

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Document preview — GB/T 45981.2-2025

National Standard of the People's Republic of China

ICS: 77.140.85
Classification: J 32

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

Preface
Introduction
1 Scope
2 Normative references
3 Terms and Definitions
4 Ordering Requirements
5 First Article Test
6 Manufacturing Process
6.1 Smelting
6.2 Forging
6.3 Heat treatment
6.4 Machining
6.5 Defect removal and repair welding
7 Technical Requirements
7.1 Chemical composition
7.2 Mechanical properties
7.3 Hardness
7.4 High-magnification tissue
7.5 Low-power tissue
7.6 Nondestructive Testing
7.7 Shape, size and appearance quality
8 Test methods
8.1 Test method and sampling method, quantity and location
8.2 Chemical composition analysis
8.3 Hardness test
8.4 Inspection of shape, size and appearance quality
9 Inspection Rules
9.1 Batch Grouping Principles
9.2 Retest
10 Acceptance and Quality Certificate
11 Labeling and packaging

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 - alpha-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

GB/T 41857 | GB/T 40883 | GB/T 37683 | GB/T 32151.51 | GB/T 13320 | GB/T 45981.3 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

Editions of GB/T 45981.2

Edition	Title	Revision	Status
GB/T 45981.2-2025	Heavy casting and forging for heavy-duty gas turbine - Part 2: Superalloy die forgings	current edition	Current

This page sells the current edition, GB/T 45981.2-2025. Earlier editions are listed for reference only.

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