Valid

GB/T 45981.3-2025Heavy casting and forging for heavy-duty gas turbine - Part 3: Steel castings (English PDF)

重型燃气轮机用大型铸锻件　第3部分：铸钢件

Preview PDF

This is a limited preview

Buy now to download the full PDF (17 pages)

Need quotation for your management?

Get a formal quotation for GB/T 45981.3-2025 in 30 minutes.

Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 1, 2025

Implementation date

February 1, 2026

Scope

GB/T 45981.3-2025 is the English-translated version of 重型燃气轮机用大型铸锻件　第3部分：铸钢件.

GB/T 45981.3-2025 is the Chinese standard "Heavy casting and forging for heavy-duty gas turbine - Part 3: Steel castings". Its scope clause reads: This document specifies the ordering requirements, manufacturing process, and technical requirements for large steel castings for heavy-duty gas turbines, and describes the corresponding test methods.

The law stipulates inspection rules, acceptance and quality certificates, labeling and packaging. This document applies to the manufacture of large steel castings for heavy-duty gas turbines using gravity casting using sand molds or molds with thermal conductivity equivalent to sand molds.

Found what you need?

Document preview — GB/T 45981.3-2025

National Standard of the People's Republic of China

ICS: 77.140.80
Classification: J 31

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 Manufacturing Process
5.1 Smelting
5.2 Casting
5.3 Heat treatment
5.4 Machining
5.5 Defect removal and repair welding
6 Technical Requirements
6.1 Chemical composition
6.2 Mechanical properties
6.3 Microstructure
6.4 Hardness
6.5 Surface Quality
6.6 Shape, dimensions and tolerances
6.7 Weight tolerance
6.8 Nondestructive Testing
6.9 Additional test requirements
7 Test methods
7.1 Inspection items, test methods and sampling quantity
7.2 Chemical composition analysis
7.3 Mechanical properties test
7.4 Metallographic Examination
7.5 Surface Quality Inspection
7.6 Shape and size inspection
7.7 Weight Check
7.8 Nondestructive Testing
7.9 Additional test
8 Inspection Rules
8.1 Batch Rules
8.2 Impact energy absorption test
8.3 Hardness test
8.4 Retest
8.5 Reheat treatment
8.6 Provisions for invalid trials
9 Acceptance and Quality Certificate
10 Labeling and Packaging
Appendix A (Normative) Additional test requirements for supplier trial product evaluation

1 Scope

This document specifies the ordering requirements, manufacturing process, and technical requirements for large steel castings for heavy-duty gas turbines, and describes the corresponding test methods.

The law stipulates inspection rules, acceptance and quality certificates, labeling and packaging.

This document applies to the manufacture of large steel castings for heavy-duty gas turbines using gravity casting using sand molds or molds with thermal conductivity equivalent to sand molds.

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 222 Permissible deviations of chemical composition of finished steel products

GB/T 223.3 Methods for chemical analysis of iron, steel and alloys - Diantipyrylmethane phosphomolybdic acid gravimetric method for the determination of phosphorus content

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 223.9 Iron, steel and alloys - Determination of aluminum 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 223.14 Iron, steel and alloys - Determination of vanadium content - Tantalum reagent extraction photometric method

GB/T 223.18 Methods for chemical analysis of iron, steel and alloys - Determination of copper content by iodine titration with sodium thiosulfate separation

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 223.23 Iron, steel and alloys - Determination of nickel content - Dimethylglyoxime spectrophotometric method

GB/T 223.26 Iron, steel and alloys - Determination of molybdenum content - Thiocyanate spectrophotometric method

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 223.31 Iron, steel and alloys - Determination of arsenic content - Separation by distillation - Molybdenum blue spectrophotometric method

GB/T 223.32 Chemical analysis methods for iron, steel and alloys - Sodium hypophosphite reduction-iodine titration method for the determination of arsenic content

GB/T 223.36 Iron, steel and alloys - Determination of nitrogen content - Separation by distillation - Neutralization titration method

GB/T 223.37 Iron, steel and alloys - Determination of nitrogen content - Indigo blue spectrophotometric method using distillation separation

GB/T 223.43 Iron, steel and alloys - Determination of tungsten content - Gravimetric and spectrophotometric methods

GB/T 223.47 Chemical analysis methods for iron, steel and alloys - Molybdenum blue photometric method with support precipitation for the determination of antimony content

GB/T 223.50 Chemical analysis of steel and alloys - Determination by direct photometry with phenylfluorone-cetyltrimethylammonium bromide

Tin amount

GB/T 223.53 Chemical analysis of iron, steel and alloys - Flame atomic absorption spectrophotometric method for the determination of copper content

GB/T 223.54 Iron, steel and alloys - Determination of nickel content - Flame atomic absorption spectrometry

GB/T 223.58 Methods for chemical analysis of iron, steel and alloys - Sodium arsenite-sodium nitrite titration method for the determination of manganese content

GB/T 223.59 Iron, steel and alloys - Determination of phosphorus content - Bismuth phosphomolybdenum blue spectrophotometric method and antimony phosphomolybdenum blue spectrophotometric method

GB/T 223.60 Chemical analysis methods for iron, steel and alloys - Perchloric acid dehydration gravimetric method for the determination of silicon content

GB/T 223.61 Methods for chemical analysis of iron, steel and alloys - Ammonium phosphomolybdate volumetric method for the determination of phosphorus

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 46786 | GB/T 43139 | GB/T 43409 | GB/T 26653 | GB/T 26648 | GB/T 45981.2 | […]

......
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

GB/T 223.53 · GB/T 223.58

Editions of GB/T 45981.3

Edition	Title	Revision	Status
GB/T 45981.3-2025	Heavy casting and forging for heavy-duty gas turbine - Part 3: Steel castings	current edition	Current

This page sells the current edition, GB/T 45981.3-2025. Earlier editions are listed for reference only.

How to Download GB/T 45981.3-2025

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.