GB/T 24521-2018 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 24521-2018 | English | 85 |
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Method for the determination of specific resistance of carbon raw materials and coke
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| GB/T 24521-2009 | English | 180 |
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Method for the determination of specific resistance of coke
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GB/T 24521-2018: Method for the determination of specific resistance of carbon raw materials and coke
---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/GBT24521-2018
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.160.10
H 32
Replacing GB/T 24521-2009
Method for the determination of specific resistance of
carbon raw materials and coke
Issued on. MAY 14, 2018
Implemented on. FEBRUARY 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Method principle... 4
4 Instruments and equipment... 4
5 Sampling and specimen preparation... 5
6 Test steps... 6
7 Results calculation... 7
8 Precision... 7
9 Inspection report... 7
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 24521-2009 “Method for the determination of
specific resistance of coke”. Compared with GB/T 24521-2009, main content
changes in this Standard are as follows.
-- modified the standard’s name to “Method for the determination of specific
resistance of carbon raw materials and coke”;
-- modified the scope (see Clause 1 of this Edition, Clause 1 of Edition 2009);
-- modified the instruments and equipment (see Clause 4 of this Edition,
Clause 4 of Edition 2009);
-- modified the requirements for preparation of particle size of specimen (see
5.3 of this Edition, 5.2 of Edition 2009);
-- modified the test steps (see Clause 6 of this Edition, Clause 6 of Edition
2009);
-- modified the results calculation (see Clause 7 of this Edition, Clause 7 of
Edition 2009);
-- modified the precision (see Clause 8 of this Edition, Clause 7 of Edition
2009).
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee
on Steels of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Standard. Ningxia Ningping Carbon Co., Ltd.,
China Pingmei Shenma Group Kaifeng Carbon Co., Ltd., Shanghai Institute of
Materials, Aiken Carbon (China) Co., Ltd., Shanxi Jinyang Carbon Co., Ltd.,
Metallurgical Industry Information Standards Institute.
Main drafters of this Standard. Liu Zhen, Cao Peifeng, Zhang Chi, Zhang
Xiaohong, Shi Xiaoxia, Wang Wendong, Liu Yunping, Feng Junjie, Wu Feng,
Duan Xueliang, Wu Jianguo, Dong Wei, Zhao Hengjun, Chen Xiaowu, Zhang
Chao, Wang Fei, Zheng Jingxu, Zhang Jinying, Cui Shuya.
Version of standard substituted by this Standard is.
-- GB/T 24521-2009.
Method for the determination of specific resistance of
carbon raw materials and coke
1 Scope
This Standard specifies method for the determination of specific resistance of
carbon raw materials and coke powders.
This Standard is applicable to the determination of specific resistance of raw
materials for carbon production such as anthracite, graphite, roasted and
crushed, calcined petroleum coke, graphitized coke, needle coke, as well as
coke powders.
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 1997, Coke-sampling and preparation of samples
3 Method principle
Put a dry specimen with a certain particle size into the specimen tank. Pass a
certain intensity of current under a certain pressure.
4 Instruments and equipment
4.1 Powder resistance measuring instrument
4.1.1 See Figure 1 for the schematic diagram of specimen device.
Figure 1 -- Schematic diagram of specimen device
4.1.2 Height measuring device. measuring range is 15mm~17mm, precision is
0.01mm.
4.1.6 Specimen cylinder. inner diameter is 16.0mm~16.3mm.
4.2 Drying oven
The temperature can be controlled at 0°C~300°C. Temperature control
precision is ±5°C, with blast.
5 Sampling and specimen preparation
5.1 For cokes, it shall be carried out according to GB/T 1997.Others may refer
5.3 Crush the shrunken specimen 3~4 times to make them all pass the 0.5mm
square hole standard sieve.
6 Test steps
6.1 Specimen weighing
Weigh 3.3g of specimen. In order to ensure the specimen height is between
15mm~17mm, the specimen volume can be adjusted if necessary.
6.2 Determination
6.2.1 Short-circuit the bottom of the specimen cylinder and the indenter. Then
apply a pressure of 3.9MPa ± 0.03MPa. Connect the wires and turn on the
power.
6.2.2 Add a specimen in the specimen cylinder (see 4.16). After compacting
and smoothing the upper surface of the specimen, place the specimen tube in
the testing machine (see 4.1.3).
6.3 Determination times
Determine twice independently. Each determination shall use the untested new
specimen. Take the average value.
7 Results calculation
Calculate the resistance of powder, ρ, according to formula (1).
8 Precision
8.1 Repeatability
Under repeatability conditions, the difference between the two measurement
results of the specimen greater than 300μΩ·m is not more than 5%. The relative
deviation of the two measurement results of the specimen less than 300μΩ·m
is not more than 8%.
9 Inspection report
The inspection report shall at least contain the following information.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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