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JB/T 12727.1-2025Nondestructive tesing instruments - Standard testing block - Part 1: Ultrasonic testing block (English PDF)

无损检测仪器试样第1部分：超声检测试样

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Issued by

Ministry of Industry and Information Technology

Level / Type

Industry · Recommended

Issue date

December 17, 2025

Implementation date

July 1, 2026

Scope

JB/T 12727.1-2025 is the English-translated version of 无损检测仪器试样第1部分：超声检测试样.

JB/T 12727.1-2025 is the Chinese standard "Nondestructive tesing instruments - Standard testing block - Part 1: Ultrasonic testing block".

This standard applies to the manufacture of ultrasonic testing standard specimens, test specimens and reference specimens made of steel; the manufacture of specimens made of other materials is subject to this standard.

It was issued by Ministry of Industry and Information Technology. Issued on 2025-12-17, in force from 2026-07-01.

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Document preview — JB/T 12727.1-2025

National Standard of the People's Republic of China

ICS: 19.100
Classification: N77

Issued by: Ministry of Industry and Information Technology

1 Scope
2 Normative references
3 Terms and definitions
4 Classification of specimens
5 Technical requirements
5.1 Material
5.2 Sound velocity
5.3 Sound attenuation
5.4 Natural defects of raw materials
5.5 Natural defects of billets
5.6 Ageing treatment
5.7 Artificial reflectors
5.8 External surface roughness
5.9 External dimensions
5.10 Scale lines
5.11 Specimen sets
6 Test methods
6.1 Raw material inspection
6.2 Sound velocity measurement
6.3 Sound attenuation deviation measurement
6.4 Natural defect detection of raw materials and billets
6.5 Artificial reflector inspection
6.6 External surface roughness inspection
6.7 External dimension inspection
6.8 Scale line depth and position measurement
6.9 Attenuation consistency test of specimen set raw materials
6.10 Fitting curve test of specimen sets
7 Inspection rules
7.1 Factory inspection
7.2 Type inspection
8 Marking, packaging, transportation and storage
8.1 Marking
8.2 Packaging
8.3 Transportation and storage
5.1.1 Chemical composition
5.1.2 Grain size

1 Foreword

JB/T 12727.1-2025 was issued by Ministry of Industry and Information Technology on 17 December 2025 and has been in force since 1 July 2026.

It is one of 5 parts of the JB/T 12727 series.

2 Scope

This standard specifies the classification and technical requirements for ultrasonic testing specimens, describes the corresponding test methods, and specifies inspection rules, marking, packaging, transportation and storage requirements. This standard applies to the manufacture of ultrasonic testing standard specimens, test specimens and reference specimens made of steel; the manufacture of specimens made of other materials is subject to this standard.

3 About this standard

Sector: Mechanical & Machinery Industry Standard (Recommended)

Issued by: Ministry of Industry and Information Technology

English translation: about 15 pages (approximate)

4 Related standards

Other parts of this standard:

JB/T 12727.2-2020 — Non-destructive testing instruments - Test blocks - Part 2: Test blocks for radiographic testing

JB/T 12727.3-2016 — Non-destructive testing instruments - Test blocks - Part 3: Test blocks for electromagnetic (eddy current) testing

JB/T 12727.4-2016 — Non-destructive testing instruments - Test blocks - Part 4: Test blocks for magnetic particle testing

JB/T 12727.5-2016 — Non-destructive testing instruments - Test blocks - Part 5: Test blocks for penetrant testing

5 Classification and status

International classification (ICS): 19.100

Chinese Standard Classification (CCS): N77

Prefix JB/T: recommended standard.

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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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