GB/T 3074.4-2016 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 3074.4-2016 | English | 110 |
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Method for the determination of the coefficient of thermal expansion of graphite electrodes
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| GB/T 3074.4-2003 | English | 90 |
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Method for the determination of the coefficient of thermal expansion of graphite electrodes
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| GB/T 3074.4-1982 | English | 199 |
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Method for the determination of the coefficient thermal expansion of graphite electrodes
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GB/T 3074.4-2016: Method for the determination of the coefficient of thermal expansion of graphite electrodes
---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/GBT3074.4-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.050
Q 51
Replacing GB/T 3074.4-2003
Method for the determination of the coefficient of
thermal expansion of graphite electrodes
Issued on. AUGUST 29, 2016
Implemented on. JULY 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Definitions and principles... 5
4 Instruments and equipment... 6
5 Specimen preparation... 7
6 Test steps... 7
7 Results calculation... 8
8 Test error... 8
9 Test report... 8
Foreword
GB/T 3074 consists of four parts.
- GB/T 3074.1, Method for the determination of the flexure strength of
graphite electrodes;
- GB/T 3074.2, Method for the determination of the elastic modulus of
graphite electrodes;
- GB/T 3074.3, Method for the determination of the oxidation resistance of
graphite electrodes;
- GB/T 3074.4, Method for the determination of the coefficient of thermal
expansion of graphite electrodes.
This Part is Part 4 of GB/T 3074.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 3074.4-2003 “Method for the determination of the
coefficient of thermal expansion of graphite electrodes”. Compared with GB/T
3074.4-2003, main changes in this Part are as follows.
-- deleted the formula derivation process (see 3.2 of Edition 2003);
-- modified the extensometer in Figure 1 to the displacement measuring
device (see Figure 1 of this Edition);
-- added “can be accessed to protective gas” in the part of thermal
dilatometer (see 4.1 of this Edition);
-- modified the device for measuring expansion on thermal dilatometer from
dial indicator to displacement measuring device (see 4.3 of this Edition);
-- modified thermometer to temperature measuring device (see 4.4 of this
Edition);
-- deleted the processing requirements for temperature measuring hole from
the part of test size (see 5.1 of Edition 2003);
-- modified the specimen size from length to “shall not be less than 50mm”;
deleted the requirements for length deviation (see 5.3 of this Edition);
-- deleted the zeroing operation of dial indicator, modified as “record the initial
reading of the displacement measuring device or reset the device to zero”
(see 6.1 of this Edition);
-- modified “room temperature ~ 600°C” to “ΔT” in some calculation formulas
(see Clause 7 of this Edition).
This Part was proposed by China Iron and Steel Association.
This Part shall be under the jurisdiction of National Technical Committee on
Steels of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Part. China Pingmei Shenma Group Kaifeng
Carbon Co., Ltd., Shanxi Simdonghai Carbon Materials Co., Ltd., Chenzhou
City Commodity Quality Supervision and Inspection Institute (National Graphite
Product Quality Supervision and Inspection Center), Metallurgical Industry
Information Standards Institute.
Main drafters of this Part. Liang Ran, Chen Wenlai, Wan Jianmin, Zhang
Xiangjun, Liu Jianhai, Ma Wei, Zhou Zhiyong, Li Jianxin, Zheng Jingxu, Zhang
Baoping, Lu Peizhong.
Versions of standard substituted by this Standard are.
-- GB/T 3074.4-1982, GB/T 3074.4-2003.
Method for the determination of the coefficient of
thermal expansion of graphite electrodes
1 Scope
This Part of GB/T 3074 specifies determination principles, instruments and
equipment, specimen preparation, test steps and results calculation for the
coefficient of thermal expansion of graphite electrodes.
This Part is applicable to the coefficient of other solid carbon materials of which
the ordinary power, high power, ultra-high-power graphite electrode and total
expansion at 600°C does not exceed 1mm, of which the temperature range is
room temperature ~ 600°C. If it needs to test the coefficient of thermal
expansion in other temperature ranges, it may refer to this method.
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 1427, Sampling method for carbon material
3 Definitions and principles
3.1 Definitions
The coefficient of thermal expansion refers to the variable of thermal expansion
of material, that is, when the temperature rises by 1°C, the amount of expansion
in a certain direction caused by the solid material per unit length is called the
coefficient of linear expansion of the material in that direction.
3.2 Principles
As shown in the schematic diagram (see Figure 1), the specimen and the quartz
reference are installed on the same base and the other end of the specimen is
in contact with the ejector pin. When the furnace is heated, the specimen,
ejector pin, and reference are heated and expanded at the same time.
4 Instruments and equipment
4.1 Thermal dilatometer. where the temperature can reach above 600°C,
protective gas (nitrogen or argon) can be introduced. The thermal dilatometer
of which the error of two repeated tests during measurement is not more than
±0.1×10-6°C-1 can be used.
4.2 Vernier caliper. the accuracy is 0.02mm.
4.3 Displacement measuring device. measuring range is 0~1mm; measuring
accuracy is 0.001mm.
5 Specimen preparation
5.1 Sampling
In accordance with GB/T 1427.
5.2 Sampling quantity
Take 2 parallel specimen for each lot.
5.3 Specimen size
For cylindrical or rectangular specimen, its diameter or side length at least is
twice maximum aggregate diameter. For cylinder or cuboid, the specimen
diameter or side length shall not be less than 5mm, the length is not less than
50mm.
6 Test steps
6.1 Turn on the thermal dilatometer heating furnace. Put the specimen into the
quartz tube in the furnace. Use quartz gaskets to cushion both ends of the
specimen. The specimen, quartz dilatometer, and quartz gasket shall be on a
central axis.
6.2 Start the power switch of the heating furnace. Adjust the voltage and current.
Record the time, temperature and expansion. Control the heating rate within
6°C/min. When the temperature rises to 400°C, the protective gas is supplied
to the heating furnace. The flow is 5L/min.
7 Results calculation
The coefficient of thermal expansion of specimen, α (°C-1) is calculated
according to formula (1).
8 Test error
The error of two repeated tests should not exceed ±0.1×10-6°C-1.
9 Test report
The test 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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