JB/T 12727.2-2020Non-destructive testing instruments - Test blocks - Part 2: Test blocks for radiographic testing (English PDF)
无损检测仪器 试样 第2部分：射线检测试样
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
April 16, 2020
Implementation date
January 1, 2021
Scope
JB/T 12727.2-2020 is the English-translated version of 无损检测仪器 试样 第2部分：射线检测试样.
JB/T 12727.2-2020 is the Chinese machinery industry standard covering non-destructive testing instruments - Test blocks, Part 2: Test blocks for radiographic testing.
It was issued on 16 April 2020 and has been in force since 1 January 2021, as a first edition. The document is under the responsibility of the Ministry of Industry and Information Technology.
This page is published from the official record of the 2020 edition. The figures, limits and tables the standard contains are those of the document itself, delivered in full with the English translation.
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Document preview — JB/T 12727.2-2020
National Standard of the People's Republic of China
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Classification
- 5 Technical requirements
- 5.1 Material
- 5.2 Shape and dimensions
- 5.3 Chemical composition and grain size
- 5.4 Natural defects of the raw material and of the blank
- 5.5 Surface roughness
- 5.6 Dimensional deviations
- 6 Inspection methods
- 6.1 Chemical composition and grain size
- 6.2 Natural defects of the raw material and of the blank
- 6.3 Surface roughness
- 6.4 Dimensional deviations
- 7 Inspection rules
- 7.1 Factory inspection
- 7.2 Type inspection
- 7.3 Inspection items
- 8 Marking, packaging, transport and storage
- 8.1 Marking
- 8.2 Packaging
- 8.3 Transport and storage
- Annex A (normative) Specimens for the calibration of the X-ray machine
- Figure 1 Radiographic flat plate specimen
- Figure 2 Two step specimen
- Figure 3 Three step specimen
- Figure 4 Multi step specimen
- Table 1 Items of the type inspection and of the factory inspection
- Table A.1 Thickness of the specimens for the calibration of the penetrating power of the portable industrial X-ray machine
- Table A.2 Thickness of the specimens for the calibration of the penetrating power of the fixed and mobile industrial X-ray machines
3 Terms and definitions
4 Classification
5 Technical requirements
6 Inspection methods
7 Inspection rules
8 Marking, packaging, transport and storage
Foreword
This document was issued on 16 April 2020 by the Ministry of Industry and Information Technology of the People's Republic of China, and has been in force since 1 January 2021.
It is the first edition of this standard.
The document is under the responsibility of the Ministry of Industry and Information Technology.
About this edition
JB/T 12727.2-2020 is the first edition of this standard. It was issued on 16 April 2020 and has been in force since 1 January 2021.
There is no earlier edition to compare it with, so a specification that has to refer to this subject can only cite JB/T 12727.2-2020 itself.
The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one announced by the Ministry of Industry and Information Technology of the People's Republic of China.
Edition history and citation
JB/T 12727.2-2020 is a first edition: there is no earlier version of this standard, so a document that needs to refer to this subject can only cite JB/T 12727.2-2020 itself.
Where an edition is replaced, the Chinese standardization system keeps the number and changes the year: the number identifies the subject, the year identifies the text. That is why a citation without a year is ambiguous and a citation with one is not.
Classification and status
JB/T 12727.2-2020 carries no ICS number in the official record.
The JB/T prefix marks a recommended standard of China's machinery industry, issued by the Ministry of Industry and Information Technology. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it.
The document is under the responsibility of the Ministry of Industry and Information Technology, which is the body that maintains it and that will answer a formal question about its interpretation.
How this standard is designated
The full designation is JB/T 12727.2-2020. A citation should carry the number with its year, because the year identifies the text that applies.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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JB/T 12727.3-2016 — Non-destructive testing instruments - Test blocks - Part 3: Test blocks for electromagnetic (eddy current) testing
JB/T 12727.1-2025 — Nondestructive tesing instruments - Standard testing block - Part 1: Ultrasonic testing block
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