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GB/T 27552-2021 PDF in English


GB/T 27552-2021 (GB/T27552-2021, GBT 27552-2021, GBT27552-2021)
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GB/T 27552-2021: PDF in English (GBT 27552-2021)

GB/T 27552-2021
Chi S d d B T PDF A d li P 1 f 15
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.160.40
CCS J 33
Replacing GB/T 27552-2011
Destructive Tests on Welds in Metallic Materials -
Microhardness Testing of Welded Joints
(ISO 9015-2:2016, Destructive Tests on Welds in Metallic Materials - Hardness
Testing - Part 2: Microhardness Testing of Welded Joints, MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 1, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 5 
4 Symbols and Abbreviations ... 6 
5 General Rules ... 6 
6 Specimen Preparation ... 6 
7 Test Procedures ... 7 
7.1 Rows of Indentations (Type-R test) ... 7 
7.2 Individual Indentations (Type-E test) ... 9 
8 Test Results ... 10 
9 Test Report ... 10 
Appendix A (informative) An Example of Hardness Test Report of Rows of
Indentations (Type-R test) on Welded Joints ... 11 
Appendix B (informative) An Example of Hardness Test Report of Individual
Indentations (Type-E test) on Welded Joints ... 13 
Bibliography ... 15 
Foreword
This document was drafted in accordance with the stipulations of GB/T 1.1-2020 Directives for
Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB/T 27552-2011 Destructive Tests on Welds in
Metallic Materials - Microhardness Testing of Welded Joints. In comparison with GB/T 27552-
2011, apart from structural adjustments and editorial modifications, the main technical changes
are as follows:
---The expression of “Scope” is modified (see Chapter 1; Chapter 1 of Version 2011);
---GB/T 4340.1 is used to replace ISO 6507-1 (see Chapter 2; Chapter 2 of Version 2011);
---The Chapter “Terms and Definitions” is added (see Chapter 3);
---“Principle” is modified into “General Rules”; the requirements for the test temperature
are modified (see Chapter 5; Chapter 3 of Version 2011);
---The relevant description of HV 5 in Table 2 is deleted. Figure 2 is modified: the NOTE
in the clause is modified into the main text (see 7.1; 6.1 of Version 2011);
---The description of rows of indentations (Type-R test) and individual indentations (Type-
E test) is modified (see 7.1 and 7.2; 6.1 and 6.2 of Version 2011);
---The expression of test report is modified (see Chapter 9; Chapter 8 of Version 2011);
---The reference of GB/T 39082 is added (see Bibliography).
This document uses the re-drafting method in the modification and adoption of ISO 9015-
2:2016 Destructive Tests on Welds in Metallic Materials - Hardness Testing - Part 2:
Microhardness Testing of Welded Joints.
---The Chapter “Terms and Definitions” is added.
In comparison with ISO 9015-2:2016, the technical differences and the causes for these
differences are as follows:
---GB/T 4340.1, which modifies and adopts the international standard, is used to replace
ISO 6507-1;
---HV 5 in Table 2 is deleted to be consistent with the stipulations of the Scope;
---The position of H in Figure 2 is modified to be consistent with the description of the
symbol H in Table 1.
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
Destructive Tests on Welds in Metallic Materials -
Microhardness Testing of Welded Joints
1 Scope
This document specifies the general rules, specimen preparation, test procedures, test results
and test report of the microhardness testing of welded joints [the range of test force is generally:
0.98 N ~ < 49.03 N (HV 0.1 ~ < HV 5)] performed in accordance with GB/T 4340.1.
This document is applicable to the cross-sectional microhardness test of welded joints of
metallic materials with a large hardness gradient.
NOTE: the hardness test shall ensure that the highest hardness and lowest hardness of the weld
metal and the parent material on both sides (for dissimilar materials) can be measured.
This document is not applicable to the hardness test with the test force greater than or equal to
49.03 N as specified in GB/T 2654.
This document is not applicable to the Vickers hardness test of resistance spot, projection and
seam welds as specified in GB/T 39082.
This document is not applicable to the hardness test of narrow welded joint specimens, such as:
laser and electron beam, whose hardness test shall be performed in accordance with GB/T
35085.
2 Normative References
Through the normative references in this text, the contents of the following documents
constitute indispensable clauses of this document. In terms of references with a specified date,
only versions with a specified date are applicable to this document. In terms of references
without a specified date, the latest version (including all the modifications) is applicable to this
document.
GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1: Test Method (GB/T 4340.1-
2009, ISO 6507-1:2005, MOD)
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Symbols and Abbreviations
The following symbols and abbreviations are applicable to this document (see Table 1).
5 General Rules
The microhardness test shall comply with the requirements of GB/T 4340.1.
The microhardness test may be performed through the mode of rows of indentations (Type-R
test) or individual indentations (Type-E test).
For welded joint types not included in the examples, test procedures applicable to the welded
joint shall be selected.
The test is generally carried out at an ambient temperature of 10 C ~ 35 C. For tests with a
rigorous temperature requirement, the test temperature shall be (23  5) C.
6 Specimen Preparation
The preparation of specimens shall comply with the requirements of GB/T 4340.1.
The cross-section of the test piece shall be prepared by machining and generally perpendicular
to the axis of the weld.
The machining and subsequent specimen surface preparation shall be carried out with care, so
as to ensure that the hardness of the tested surface is not affected by overheating or cold working.
The surface of the specimen shall be prepared and eroded in a reasonable mode, so as to
accurately determine the indentation diagonal lengths in different areas of the welded joint.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.