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GB/T 44921-2024Casting—Industrial computer radiographic testing (English PDF)

铸件工业计算机射线照相检测

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

November 28, 2024

Implementation date

June 1, 2025

Scope

GB/T 44921-2024 is the English-translated version of 铸件工业计算机射线照相检测.

GB/T 44921-2024 is the Chinese national standard covering radiography of castings onto a storage phosphor imaging plate read by a scanner rather than onto film — the ordering information, the technique levels, the general requirements and the exposure technique for X-ray and gamma sources, the image assessment, the records and reports, and the normalized signal-to-noise ratio, minimum image quality value, minimum grey value and basic spatial resolution that decide whether an image can be judged at all. It covers cast steel and cast iron and the copper, nickel, magnesium, aluminium and titanium alloys, with a separate rule for how many exposures an annular casting needs. First edition. In force from 1 June 2025. Issued on 28 November 2024, it has been in force since 1 June 2025.

Document preview — GB/T 44921-2024

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

PrefaceIII
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Symbols3
5 Ordering information4
6 Computed radiography technology level4
7 General requirements4
8 Detection Technology6
9 Image Assessment21
10 Test records and reports22
Appendix A (Normative) Determination of Normalized Signal-to-Noise Ratio23
Appendix B (Normative) Minimum Image Quality Value24
Appendix C (Normative) Determination of minimum grayscale value28
Appendix D (Normative) Determination of basic spatial resolution31
Appendix E (Informative) Determination of the minimum number of transilluminations for annular castings34

Foreword

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.

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 is proposed and coordinated by the National Casting Standardization Technical Committee (SAC/TC54).

This document was drafted by: China Machinery Engineering Institute Group Shenyang Foundry Research Institute Co., Ltd., Anhui Yangtian Jinsu New Energy Equipment Co., Ltd.

Shanghai Baoyue New Material Technology Co., Ltd., Lanzhou Richgod Measurement and Control Technology Co., Ltd., Lanzhou Lanshi Testing Technology Co., Ltd., Shanghai Wanze Precision Casting Co., Ltd., Luoyang Shuangrui Precision Casting Titanium Co., Ltd., Suzhou Paidens Instrument Equipment Co., Ltd., Deep Sea Precision Technology (Shenzhen) Co., Ltd., Zhejiang Suijin Special Casting Co., Ltd., Zhejiang Mechanical and Electrical Vocational and Technical College, Zhejiang Dongxin Power Co., Ltd., Jiangsu Wan Hengxin Materials Technology Co., Ltd., CRRC Qiqihar Co., Ltd., CRRC Changchun Railway Vehicles Co., Ltd., China Railway Baoqiao Group Co., Ltd., Baoti Group Co., Ltd., Chongqing Rilian Technology Co., Ltd., Nanjing Huajian Testing Technology Co., Ltd., CITIC Dicastal Co., Ltd.

Company, Jinyun County Kelier Testing Equipment Co., Ltd., Fujifilm (China) Investment Co., Ltd., Yantai Hengbang Pump Industry Co., Ltd., Inner Mongolia Baotou Branch of Autonomous Region Special Equipment Inspection Institute, Shandong Longji Machinery Co., Ltd., Shandong Haoxin Co., Ltd., Tongling University, China Ordnance Science Academy Ningbo Branch, Taigang Alloy (Zhongshan) Co., Ltd., Changzhou Savilli Casting Technology Co., Ltd., Guizhou Aerospace Wind Hua Precision Equipment Co., Ltd., Henan Huatan Testing Technology Co., Ltd., Harbin Xinrun Industrial Co., Ltd., Jiangsu Kate Auto Parts Co., Ltd.

Company, Harbin Jiuzhou Group Co., Ltd., Chengdu Runbo Technology Co., Ltd., Botou Yaqi Casting Co., Ltd., Guangdong Zhongtian Chuangzhan Ductile Iron Co., Ltd., Guangdong Hongtu Technology Co., Ltd., Swell Marui (Guangzhou) Auto Parts Co., Ltd., Zhejiang Dalon New Materials Co., Ltd., Sanming Yijun Machinery Casting Co., Ltd., Guangdong Hongtu Nantong Die Casting Co., Ltd., Jiangxi Zhiqiang Fastener Co., Ltd., CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co., Ltd., Titanium (Beijing) Industrial Technology Co., Ltd., Chongqing Changshou Lake Boat Manufacturing Co., Ltd. Manufacturing Co., Ltd.

The main drafters of this document are: Li Xingjie, Sun Chungui, Dong Wenbo, Sun Zhongcheng, Chen Kaimin, Shao Tian, Jin Huaiwei, Wang Chuan, Jiang Chunhong, Xu Xu, Lu Min, Zhang Yanfei, Qi Bing, Xu Liulong, Yang Long, Guan Renfa, Fu Bin, Zhang Jianxiong, Pan Rongguo, Zhang Zhifeng, Cao Qiao, Song Quanzhi, Tian Meng, Wang Hanchao, Chao Xiang, Ye Junchao, Hu Binding, Huang Dehai, Zhang Fuwang, Liu Jun, Lu Qifeng, Yuan Guanjun, Wang Hongguang, Yu Han, Zhang Zhen, Zhu Zhengfeng, Li Xinyue, Meng Xin, Liu Zhendong, Pang Shuai, Lü Jixian, Xu Lifeng, Zhang Lijun, Sun Zhibiao, Zhang Peigen, Yang Mingjun, Hu Kuanming, Peng Yongjie, Gao Yalong, Li Ping, Wang Engang, Lü Guolai, Zhou Mingjun, Guo Xingchun, Ke Zhimin, Yan Feng, Huang Junyuan, Yu Cheng, Liu Yuanyi, Fang Zhonghua, Jiang Tianfang, Yang Mu, Chen Ganyan.

Industrial Computer Radiography Testing of Castings

1 Scope

This document specifies the classification, quality and inspection of castings using industrial computerized X-ray and gamma radiography techniques using stored phosphor imaging plates (IP).

General requirements, testing techniques, image assessment, test records and reports.

This document is applicable to cast steel, cast iron, copper and copper alloys, nickel and nickel alloys, magnesium and magnesium alloys, aluminum and aluminum alloys, titanium and titanium alloys, etc.

Industrial computer radiography inspection of castings, and other castings are used for reference.

2 Normative references

GB/T 5677

GB/T 9445

GB/T 12604.2

GB 18871

GB/T 21355-2022

GB/T 21356

GB/T 23901.1

GB/T 23901.2

GB/T 23901.5

GB/T 23910

GB/T 25758

GB/T 39427

3 Terms and definitions

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

3.1 A system that converts information into digital images

It consists of a storage phosphor imaging plate (IP), a corresponding information readout unit (scanner or reader) and system software.

3.2

A photoluminescent phosphorescent material that absorbs and stores information about the rays transmitted by the object being detected and forms a latent image.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 36 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 5677 · GB/T 9445 · GB/T 12604.2 · GB/T 21355-2022 · GB/T 21356 · GB/T 23901.1 · GB/T 23901.2 · GB/T 23901.5 · GB/T 25758

Editions of GB/T 44921

Edition	Title	Revision	Status
GB/T 44921-2024	Casting - Industrial computer radiographic testing	current edition	Current

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