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GB/T 45981.1-2025Heavy casting and forging for heavy-duty gas turbine - Part 1: Steel open die forgings (English PDF)

重型燃气轮机用大型铸锻件　第1部分：钢质自由锻件

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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 45981.1-2025 is the English-translated version of 重型燃气轮机用大型铸锻件　第1部分：钢质自由锻件.

GB/T 45981.1-2025 is the Chinese standard "Heavy casting and forging for heavy-duty gas turbine - Part 1: Steel open die forgings".

Its scope clause reads: This document specifies the supplier requirements, manufacturing process, technical specifications, and other requirements for large alloy structural steel and martensitic heat-resistant steel free forgings for heavy-duty gas turbines.

It specifies the technical requirements, describes the corresponding test methods, and stipulates the inspection rules, acceptance and quality certificates, as well as labeling and packaging.

This document is applicable to F-class heavy-duty gas turbine shaft heads, center tie rods, compressors, turbine wheels and other steel free forgings (hereinafter referred to as forgings manufacturing of parts).

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Document preview — GB/T 45981.1-2025

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 Supplier Requirements
4.1 Qualification and performance requirements
4.2 First Article Certification
4.3 Certification Project
4.4 Nondestructive testing qualifications and program requirements
4.5 Information negotiation between supply and demand parties
5 Manufacturing Process
5.1 Smelting
5.2 Forging
5.3 Heat Treatment
5.4 Machining
5.5 Defect Removal
6 Technical Requirements
6.1 Chemical composition
6.2 Mechanical properties
6.3 Hardness uniformity
6.4 Metallographic Structure
6.5 Nondestructive Testing
6.6 Residual stress
6.7 Dimensions and surface roughness
7 Test Methods
7.1 Test method and sampling method, quantity and location
7.2 Chemical analysis
7.3 Mechanical properties test
7.4 Hardness test
7.5 Determination of residual stress
8 Inspection Rules
8.1 Batch Rules
8.2 Retest
8.3 Reheat treatment
9 Acceptance and Quality Certificate
9.1 Acceptance
9.2 Quality Certificate
10 Labeling and packaging
Appendix A (Informative) Schematic diagram of sampling for mechanical properties of forgings
Appendix B (Informative) Hardness Test Diagram
Appendix C (Informative) Schematic diagram of residual stress detection

1 Scope

This document specifies the supplier requirements, manufacturing process, technical specifications, and other requirements for large alloy structural steel and martensitic heat-resistant steel free forgings for heavy-duty gas turbines.

It specifies the technical requirements, describes the corresponding test methods, and stipulates the inspection rules, acceptance and quality certificates, as well as labeling and packaging.

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 223.42 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 223.43 Iron, steel and alloys - Determination of tungsten content - Gravimetric and spectrophotometric methods

GB/T 223.79 Determination of multi-element content of steel - X-ray fluorescence spectrometry (conventional method)

GB/T 223.82 Determination of hydrogen content of steel - Inert gas fusion - Thermal conductivity or infrared method

GB/T 223.88 Iron, steel and alloys - Determination of calcium and magnesium content - Inductively coupled plasma atomic emission spectrometry

GB/T 223.90 Iron, steel and alloys - Determination of silicon content - Inductively coupled plasma atomic emission spectrometry

GB/T 228.1 Tensile tests on metallic materials - Part 1.Room temperature test methods

GB/T 228.2 Tensile tests on metallic materials - Part 2.High temperature test methods

GB/T 229 Charpy pendulum impact test method for metallic materials

GB/T 2975 Sampling location and specimen preparation for mechanical property tests on steel and steel products

GB/T 4336 Carbon steel and medium and low alloy steel - Determination of multi-element content - Spark discharge atomic emission spectrometry (conventional method)

GB/T 6394 Determination of average grain size of metals

GB/T 7232 Terminology for Metal Heat Treatment

GB/T 8541 Forging Terminology

GB/T 9445 Qualification and certification of non-destructive testing personnel

GB/T 10561 Determination of non-metallic inclusions in steel - Microscopic examination method using a graded chart

GB/T 11170 Stainless steel - Determination of multi-element content - Spark discharge atomic emission spectrometry (routine method)

GB/T 11261 Determination of oxygen content of iron and steel - Pulsed heating inert gas fusion-infrared absorption method

GB/T 12778 Metal Charpy impact fracture test method

GB/T 13298 Metal microstructure examination methods

GB/T 17394.1 Metallic materials Leeb hardness test Part 1.Test method

GB/T 20066 Sampling and preparation of samples for determination of chemical composition of steel and iron

GB/T 20123 Determination of total carbon and sulfur content of steel - Infrared absorption method after combustion in a high-frequency induction furnace (conventional method)

GB/T 20124 Determination of nitrogen content of steel - Inert gas fusion thermal conductivity method (conventional method)

GB/T 20125 Low alloy steel - Determination of multi-element content - Inductively coupled plasma atomic emission spectrometry

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 — 24 pages — is available in the English PDF.

Referenced standards

Normative references

Editions of GB/T 45981.1

Edition	Title	Revision	Status
GB/T 45981.1-2025	Heavy casting and forging for heavy-duty gas turbine - Part 1: Steel open die forgings	current edition	Current

This page sells the current edition, GB/T 45981.1-2025. Earlier editions are listed for reference only.

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