GB/T 229-2020 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 229-2020 | English | 365 |
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Metallic materials - Charpy pendulum impact test method
| Valid |
| GB/T 229-2007 | English | 85 |
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Metallic materials -- Charpy pendulum impact test method
| Obsolete |
| GB/T 229-1994 | English | 279 |
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Metallic materials--Charpy notch impact test
| Obsolete |
| GB 229-1984 | English | 199 |
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2 days
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Metallic materials--Charpy impact test (U-notch)
| Obsolete |
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GB/T 229-2020: Metallic materials - Charpy pendulum impact test method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT229-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.10
H 22
Replacing GB/T 229-2007
Metallic materials - Charpy pendulum impact test
method
(ISO 148-1.2016, Metallic materials - Charpy pendulum impact test - Part 1.
Test method, MOD)
Issued on. SEPTEMBER 29, 2020
Implemented on. APRIL 04, 2021
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 4
1 Scope... 8
2 Normative references... 8
3 Terms and definitions... 8
3.1 Energy-related definitions... 8
3.2 Definitions related to specimens... 9
4 Symbols and description... 11
5 Test principle... 12
6 Specimen... 13
6.1 General requirements... 13
6.2 Notch geometry... 14
6.3 Deviation of specimen size... 14
6.4 Preparation of specimens... 15
6.5 Marking of specimens... 15
7 Test equipment... 15
7.1 General requirements... 15
7.2 Installation and calibration... 15
7.3 Pendulum blade... 16
8 Test procedure... 16
8.1 General requirements... 16
8.2 Determination of friction loss... 16
8.3 Test temperature... 18
8.4 Transfer of specimens... 18
8.5 Capability range of testing machine... 19
8.6 Incomplete fracture of specimen... 20
8.7 Pendulum jammed by specimen... 20
8.8 Post-fracture inspection... 20
8.9 Test results... 21
9 Test report... 21
9.1 Necessary content... 21
9.2 Optional content... 21
Appendix A (Informative) Self-centering clamp... 23
Appendix B (Informative) Lateral expansion value... 24
Appendix C (Informative) Shear section rate... 28
Appendix D (Informative) Absorbed energy-temperature curve and transition
temperature... 31
Appendix E (Informative) Measurement uncertainty of absorbed energy value
K... 33
References... 42
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 229-2007 "Metallic materials - Charpy pendulum
impact test method". Compared with GB/T 229-2007, the main technical
changes are as follows.
- In the scope, ADD the unnotched specimens; MAKE requirements for the
terms and definitions, symbols and descriptions, dimensional deviations,
specimen installation of unnotched specimens (see Chapter 1, 3.2.1, Table
1, Table 2, 8.1, Appendix A);
- MODIFY and ADD some terms and definitions (see 3.1.3, 3.2.1, 3.2.2; 3.2.1,
3.2.2 of the 2007 edition);
- ADD the symbol B of specimen thickness; ADD the symbol α of the angle
when the pendulum is released; ADD the description of the elevation angle
β1 and β2; ADD the symbol KN of the nominal value of the initial potential
energy; ADD the symbol M of the moment; ADD the energy loss symbol p
caused by pointer friction, the energy loss symbol p' caused by bearing
friction and air resistance, the correction symbol pβ for the energy loss
caused by the elevation angle β; MODIFY the symbol of shear section rate,
which is changed to SFA; ADD the transition temperature symbol Tt27
corresponding to the specified absorption energy value of 27J, the
transition temperature symbol Tt50%US corresponding to 50% of the energy
absorbed on the upper platform, the transition temperature symbol Tt50%SFA
corresponding to the shear section rate of 50%, the transition temperature
symbol Tt0.9 corresponding to lateral expansion value 0.9 mm (see Table 1;
Table 1 of the 2007 edition);
- SUPPLEMENT and IMPROVE the principle of impact test (see Chapter 5;
Chapter 5 of the 2007 edition);
- ADD the determination of friction loss (see 8.2);
- MODIFY the test temperature requirements (see 8.3.3; 8.2.3 of the 2007
edition);
- ADD the necessary and optional content of the test report [see 9.1 g), 9.2
j), k)];
- ADD the Informative Appendix E "Measuring uncertainty of absorbed
energy value K" (see Appendix E);
- DELETE the Informative appendix of the high temperature or low
temperature compensation value (see Appendix E of the 2007 edition).
This standard uses the redrafting method to amend and adopt ISO 148-1.2016
"Metallic materials - Charpy pendulum impact test - Part 1.Test method".
Compared with ISO 148-1.2016, this standard has structural differences,
adding clause 8.9 test results.
Compared with ISO 148-1.2016, this standard has technical differences. The
terms involved in these differences have been marked by a vertical single line
(|) on the outer margins.
The technical differences between this standard and ISO 148-1.2016 and the
reasons are as follows.
- In the scope of Chapter 1, ADD the unnotched specimens to suit China's
national conditions;
- Regarding normative references, this standard has adjusted the technical
differences to adapt to Chinese technical conditions. The adjustments are
reflected in Chapter 2 "Normative references". The specific adjustments are
as follows.
● USE GB/T 3808 which adopts the international standard through
modification to replace ISO 148-2 (see 7.2, E.2.1.2);
● ADD the reference to GB/T 2975 (see 6.4);
● ADD the reference to GB/T 8170 (see 8.9);
● ADD the reference to JJG 145 (see 7.2);
● DELETE the ISO 268-1 (see Table 2 of ISO 148-1).
- In Table 1, ADD the symbols KT and descriptions that were missed in the
ISO standard; ADD the symbols and descriptions of the unnotched
specimens correspondingly due to the addition of unnotched specimen in
the Scope; CLARIFY the units of β1 and β2 as "°" and the unit of K1, K2, KN
as "J", to avoid unit confusion;
- MODIFY the last two paragraphs of the principle of Chapter 5 to be a note,
because this part of the content is a further explanation of the principle;
- In 6.1.2, ADD the "specimens of other thicknesses can also be used through
agreement", to expand the scope of application of this standard;
- In 6.4, ADD that "the cutting of specimen blanks shall be carried out in
accordance with the relevant product standards or the provisions of GB/T
2975" for the convenience of actual operation;
- In Table 2, ADD the size and tolerance of U-notch specimens which have a
ligament width of 8 mm; ADD the notes for unnotched specimens; ADJUST
the angle tolerance between adjacent longitudinal surfaces of the specimen;
DELETE the tolerance grades of the two notches, to meet China's national conditions;
- For the convenience of application, ADD the symbols KW2 and KW8 used
for the pendulum hammer blade of the unnotched specimen in 7.3;
- In order to facilitate the operation of the application of unnotched specimens,
ADD the requirements for the installation position of unnotched specimens
and the pre-test inspection requirements in 8.1;
- ADD the detailed requirements for bearing friction and windage loss in 8.2.2,
to facilitate the implementation of the standard;
- In 8.5, ADD the lower limit of use of the testing machine and the
requirements for resolution; ADD note 2 to explain it, to improve the
operability of the standard and facilitate the implementation of the standard;
- In order to increase the operability, ADD the description in 8.6 when the
pendulum does not break the specimen due to insufficient impact energy of
the testing machine and the measured absorbed energy exceeds the
energy range of the testing machine;
- In 8.9, ADD the energy-absorption rounding-off requirements to improve the standard operability;
- In 9.1, ADD the item c) notch type and ligament width (notch depth); in item
d), ADD the requirement for expression method of specimen size, to improve the standard operability;
- In Appendix A, DELETE the sentence "the size of the centering clamp with
thickness of 5 mm and 3 mm" due to data errors; ADD the requirements for
clamps for unnotched specimens; ADD the requirements for clamps for U-
notches, to improve the standard operability, to facilitate the implementation of standards.
This standard has made the following editorial changes.
- MODIFY the standard name;
- In the note of 3.1.2, ADD the expression that "use the letter W to represent
unnotched specimens".
This standard was proposed by the China Iron and Steel Association.
This standard shall be under the jurisdiction of the National Steel
Standardization Technical Committee (SAC/TC 183).
Drafting organizations of this standard. Central Iron and Steel Research
Institute, Metallurgical Industry Information Standards Institute, Shanxi Taigang
Stainless Steel Co., Ltd., Shanghai Shenli Testing Machine Co., Ltd., Shenzhen
Wance Testing Equipment Co., Ltd., Nanjing Iron and Steel Co., Ltd., National
Iron and Steel Co., Ltd. Product Quality Supervision and Inspection Center,
Pabo Testing Technology Service Co., Ltd., Lixi (Shanghai) Scientific
Instrument Co., Ltd., Qiqihar Huagong Machine Tool Co., Ltd., Minmetals
Yingkou Medium Plate Co., Ltd., Shougang Group Co., Ltd., Chengdu Iron and
Steel Research Institute Testing and Certification Co., Ltd., Dalian Hope
Physical and Chemical Testing Technology Co., Ltd., Shanghai Institute of Materials.
The main drafters of this standard. Liu Tao, Gao Yifei, Dong Li, Wang Liying,
Huang Xing, Li Jianfeng, Zhang Huawei, Zhang Xiaoli, Xu Liang, Wang Bin,
Wang Hongliang, Zhong Yangyang, Qiu Yu, Yin Jianjun, Jia Yuanwei, Zhou Lifu,
Wang Bin, Liang Caimeng, Zhang Qingshui, Hou Huining.
This standard replaces the standard previously issued as follows.
- GB/T 229-1984, GB/T 229-1994, GB/T 229-2007.
1 Scope
This standard specifies the Charpy pendulum impact test method for measuring
the energy absorbed by impact specimens in the impact test of metallic materials.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB/T 2975 Steel and steel products - Location and preparation of
specimens and test pieces for mechanical testing (GB/T 2975-2018, ISO 377.2017, MOD)
GB/T 3808 Verification of pendulum-type impact testing machines (GB/T
3808-2018, ISO 148-2.2008, MOD)
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
JJG 145 Verification regulation of pendulum impact testing machines
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Energy-related definitions
3.1.1
Initial potential energy
Potential energy
Kp
The potential energy of the pendulum before the impact test of the drop
pendulum, which is determined by direct calibration.
3.1.2
Absorbed energy
The energy required by the pendulum impact testing machine to break the
specimen, which is the value after friction correction.
4 Symbols and description
The symbols and descriptions used in this document are as shown in Table 1.
B, mm, Specimen thickness
α, °, Angle when the pendulum is released
5 Test principle
The test specified in this standard uses a single impact of a pendulum to break
the specimen. The test conditions are given in Chapter 6, Chapter 7, Chapter 8.
6 Specimen
The length of the standard size impact specimen is 55 mm; the cross
section is a square cross-section of 10 mm × 10 mm. There is a V-shaped or
U-shaped notch in the middle of the specimen length, see 6.2.1 and 6.2.2.
7 Test equipment
All measuring instruments shall be traceable to national or international
standards. The measuring instrument shall be calibrated within a suitable period.
8 Test procedure
The specimen shall be close to the anvil of the testing machine; the
distance between the symmetry plane of the specimen notch and the middle
plane of the two anvils shall be no more than 0.5 mm.
9 Test report
The test report shall include the following or when the customer allows, the
following information can be traced through the report number provided by the laboratory.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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