GB/T 43139-2023 PDF in English
GB/T 43139-2023 (GB/T43139-2023, GBT 43139-2023, GBT43139-2023)
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Density detecting method for vacuum solidified samples of casting aluminum alloys liquid
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Standards related to (historical): GB/T 43139-2023
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GB/T 43139-2023: PDF in English (GBT 43139-2023) GB/T 43139-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.10
CCS J 31
Density detecting method for vacuum solidified samples of
casting aluminum alloys liquid
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Principle ... 5
5 Test conditions ... 6
6 Test equipment ... 6
7 Sample preparation requirements ... 7
8 Test steps ... 8
9 Precision ... 10
10 Test report ... 10
Annex A (informative) Reference correspondence between density values and pinhole
levels of different aluminum alloys ... 12
Annex B (informative) Reference comparison between different density values and
low-magnification structure of vacuum solidified samples ... 13
Bibliography ... 16
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by and shall be under the jurisdiction of National
Technical Committee on Casting of Standardization Administration of China (SAC/TC
54).
The drafting organizations of this document: Shenyang University of Technology,
Henan Feilong (Wuhu) Auto Parts Co., Ltd., Tianjin Lizhong Wheel Co., Ltd., Zhejiang
Wanfeng Motorcycle Co., Ltd., Tianjin Xinlizhong Alloy Group Co., Ltd., Guangdong
Hongtu Technology Co., Ltd., Chinalco Material Application Research Institute Co.,
Ltd., CITIC Dicastal Co., Ltd., Foshan Vocational and Technical College, Changsha
Dicastal Technology Co., Ltd., Dongfeng (Shiyan) Nonferrous Casting Co., Ltd.,
Shandong Juncheng Metal Technology Co., Ltd., Shenzhen Lingwei Technology Co.,
Ltd., Hebei New Lizhong Nonferrous Metals Group Co., Ltd., Shandong University,
Ludong University, Dongguan Yi'an Technology Co., Ltd., Sanmenxia Quality and
Technical Supervision, Inspection and Testing Center, Zhejiang Qianjin HVAC
Technology Co., Ltd., Liaoning Zhongkeli Le Testing Technology Service Co., Ltd.
Company, Fengcheng Hexin Machinery Manufacturing Co., Ltd., Zhejiang Bodong
Industry and Trade Co., Ltd., China Aviation Development Harbin Dongan Engine Co.,
Ltd., Ningbo Longyuan Co., Ltd., China Machinery Industry Group Shenyang Casting
Research Institute Co., Ltd., Shenyang Casting Research Technology Co., Ltd., General
Institute of Mechanical Science (Jiangle) Semi-Solid State Technology Research
Institute Co., Ltd., Guangdong Hongtuo Instrument Technology Co., Ltd.
Main drafters of this document: Zhao Zhongxing, Zhang Xianfei, Liu Fengguo, Lu
Shiping, Zhong Gu, Zhang Feng, Zhang Jianliang, Yang Zhaoling, Yan Feng, Bai
Bangwei, Ye Zhen, Liang Xin, Li Zhaohua, Huo Huijuan, Sun Fangfang, Zhu Jiahui,
Wu Yuying, Hu Zhongchao, Li Weirong, Cai Hengzhi, Hou Wei , Dong Zhen, Gao
Zhongyu, Sun Dashu, Yu Zhongjun, Yan Shengyuan, Lu Chenming, Liu Qinshuang,
Yang Jie, Song Wei, Li Dongyu, Sun Pu, Zheng Lijun, Sun Ju, Zhang Chunming, Lin
Guodong, Zhong Conggang, Pan Shuguang.
Density detecting method for vacuum solidified samples of
casting aluminum alloys liquid
WARNING -- Personnel using this document shall have practical experience in
formal laboratory or smelting site work. This document does not identify all
possible security issues. Users are responsible for taking appropriate safety and
health measures and ensuring compliance with relevant national regulations.
1 Scope
This document specifies the principle, test conditions, test equipment, sample
preparation requirements, test steps, precision and test reports for density detecting of
vacuum solidified samples of casting aluminum alloy liquid.
This document is suitable for rapid density detecting for vacuum solidified samples of
casting aluminum alloy liquid.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 5611, Foundry terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 5611 apply.
4 Principle
The method for detecting the density of vacuum solidified samples of casting aluminum
alloy liquid (hereinafter referred to as "vacuum solidified samples") is: Based on the
law of buoyancy (Archimedes' law), the volume of the vacuum solidified sample is
obtained by weighing it completely immersed in water; the density value of the vacuum
solidified sample is obtained through the density relationship.
a preheated pouring spoon to take out the aluminum alloy liquid below 10 cm
from the surface of the aluminum alloy liquid. Pour aluminum alloy liquid into
the crucible. The amount of aluminum alloy liquid poured is less than 80% of the
height in the crucible. The crucible shall not be filled to the brim so that the
vacuum solidified sample can be removed under reduced pressure;
c) After the pouring of the vacuum solidified sample is completed, cover the vacuum
tank. Start the vacuum system. The time relay starts timing. Make the vacuum
degree of the vacuum chamber reach a sample preparation vacuum degree
between -0.092 MPa~-0.099 MPa within 15 s. During this period, the aluminum
alloy liquid in the crucible does not solidify;
d) Observe the gas generation during the solidification process of the aluminum alloy
liquid through the glass window above the vacuum tank. For aluminum alloy
liquids with a large gas content, a large number of bubbles can be observed to
precipitate from the aluminum alloy liquid;
e) After the vacuum solidified sample is solidified, take the vacuum solidified sample
out of the crucible and weigh it;
f) When weighing, first place the vacuum solidified sample frame in the container.
Turn on the electronic scale switch so that the indication is zero. If the indication
is not zero, press the "Tare" key to make the indication zero. Place the vacuum
solidified sample above the electronic scale and weigh its mass in air, as shown
in Figure 4. After the black dot in the lower left corner of the screen disappears,
gently press the "Mode" key. It is displayed on the panel as shown in Figure 5.
8.1.2 Place the vacuum solidified sample in the material frame in the container below
the electronic scale (make sure that the vacuum solidified sample is completely
immersed in water). Weigh the mass in water. After the black dot in the lower left corner
of the screen disappears, gently press the "Mode" key. Displays the density value in the
panel.
NOTE: Refer to Annex A and Annex B for the corresponding relationship between the density value
measured in the test and the pinhole degree and low-magnification structure of aluminum alloy.
9 Precision
Use the following provisions to judge the validity of the results.
a) Repeatability: The same operator performs repeated measurements on the same
vacuum solidified sample on the same instrument. The relative standard deviation
of the two test results shall not exceed 2%. It is based on the premise that the case
that it is greater than 2% of the relative standard deviation value of the two test
results shall not exceed 5%.
b) Reproducibility: Different operators conduct measurements on the same vacuum
solidified sample in different laboratories. The relative standard deviation value
of the two test results shall not exceed 4%. It is based on the premise that the case
that it is greater than 4% of the relative standard deviation value of the two test
results shall not exceed 5%.
10 Test report
The test report shall include but not be limited to the following:
a) Reference to this document;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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