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GB/T 46654-2025Radiographic testing for titanium alloy castings - Defect levels (English PDF)

钛合金铸件射线照相检测　缺陷分级

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

October 31, 2025

Implementation date

May 1, 2026

Scope

GB/T 46654-2025 is the English-translated version of 钛合金铸件射线照相检测　缺陷分级.

GB/T 46654-2025 is the Chinese standard "Radiographic testing for titanium alloy castings - Defect levels". Its scope clause reads: This document specifies the basic requirements for radiographic testing of titanium and titanium alloy castings (hereinafter referred to as "castings"), and describes the defect classification and grade.

The corresponding methods for grade assessment. This document applies to radiographic inspection of defects such as porosity, inclusions, and shrinkage in titanium alloy castings with a thickness not exceeding 50.8 mm.

For castings with a thickness greater than 50.8 mm, the classification should be followed accordingly. This document is not applicable to the classification of defects such as cracks, segregation, cold shuts, and incomplete penetration and fusion caused by weld repairs. Its clauses include terms and definitions.

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Document preview — GB/T 46654-2025

National Standard of the People's Republic of China

ICS: 77.120.50
Classification: J 31

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

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
3.

1 Scope

This document specifies the basic requirements for radiographic testing of titanium and titanium alloy castings (hereinafter referred to as "castings"), and describes the defect classification and grade.

The corresponding methods for grade assessment.

This document applies to radiographic inspection of defects such as porosity, inclusions, and shrinkage in titanium alloy castings with a thickness not exceeding 50.8 mm.

For castings with a thickness greater than 50.8 mm, the classification should be followed accordingly.

This document is not applicable to the classification of defects such as cracks, segregation, cold shuts, and incomplete penetration and fusion caused by weld repairs.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 5611 Casting Terminology

GB/T 5677 Radiographic Inspection of Castings

GB/T 12604.2 Nondestructive Testing Terminology. Radiographic Testing

3 Terms and Definitions

The terms and definitions defined in GB/T 5611 and GB/T 12604.2, as well as the following terms and definitions, apply to this document.

3.1 single gashole

The casting contains isolated, non-interacting pores formed by gas inside.

3.2 Scattered gasholes

The casting contains a sparsely distributed, weakly interconnected pore structure formed by gas.

3.3 Clustered gasholes

The casting contains a densely distributed group of strongly interacting pores formed by gas.

3.4 Low-density inclusions

Foreign matter present inside the casting that has a lower density than the matrix and causes less attenuation of radiation.

3.5 High-density inclusions

Foreign matter present inside the casting that is denser than the matrix and has a greater attenuation effect on radiation.

3.6

During the solidification process of a casting, a dispersed, non-dense area is formed by multiple point-like and strip-like micropores due to cooling and shrinkage.

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

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 57 pages — is available in the English PDF.

Referenced standards

Normative references

Editions of GB/T 46654

Edition	Title	Revision	Status
GB/T 46654-2025	Radiographic testing for titanium alloy castings - Defect levels	current edition	Current

This page sells the current edition, GB/T 46654-2025. Earlier editions are listed for reference only.

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