This part specifies the determination principle, instrumentation, sample preparation, test steps and calculation method of thermal expansion coefficient of graphite electrode. This part is applicable to normal power, high power, ultra-high power graphite electrodes and other solid carbon materials with a total expansion of no more than 1 mm at 600°C. The temperature range is the average linear expansion coefficient from room temperature to 600°C. GB/T 3074.4-2003 Determination method of thermal expansion coefficient (CTE) of graphite electrode GB/T3074.4-2003 Standard download decompression password: www.bzxz.net

G4 electrode test method is divided into 4 parts:
positive electrode flexural deformation test head:
do not compare the single pole test method;
white pressure pole oxidizability test method:
stone core pole thermal expansion coefficient (TE) determination method This part replaces YK3374.1982 heat loss H measurement method (CTE test method, CB/T3C74.4-2003
this part is compared with CB/T1.1-1X24.F zero electrode thermal expansion coefficient (CTE> complete, the main changes are as follows: the phase method is set as The prohibition method of writing the ticket is half-heated and the number of tickets is 1800. The room group: expand the state model state,
cross-amplify the principle diagram of the equipment.
This part is proposed by the National Iron and Steel Industry Association. The West Branch of the Shanxi Metallurgical Industry Information Standard is under the jurisdiction of the Research Institute, the South Branch of the driving unit, the State Su Ji Co., Ltd., the Cold Metal Industry Information International Research Institute, most of the single person, Liu Xinhuo, Gao Fengbi Zhang Zhitong, Zhong Yongli, said that the part was first published in 2014:
1 Fan Tian
Determination method of graphite electrode
Determination method of thermal expansion coefficient (CTE) of graphite electrode GB/I 3074.4--2003
This part specifies the principle, apparatus, test preparation, test procedures and methods for the determination of thermal sensitivity coefficient. This part is applicable to the following three types of carbon materials: thermal sensitivity coefficient, power consumption, thermal sensitivity coefficient and total thermal sensitivity coefficient. The temperature range is the average humidity coefficient. 2 Normative references
The following references are also used as references in this part. All subsequent changes (excluding those mentioned above) or revisions are used in the technical part. However, the new version of this document is the new version of the document. The applicable version of the document is GB/T1427 Carbon materials and sampling methods.
3 Definitions and principles
3.1 Definitions| |tt|| The effect of the sensing system refers to the change in the thermal energy of the material. That is, when the temperature rises by 1, the amount of expansion along the specific direction of the material is called the residual expansion of the material along that direction. 3.2 Principle
As shown in the original diagram (see Figure 1), the test group and the test objects are not necessarily installed on the same sheet of paper. When the furnace is activated, the item is recovered. At the same time, the micro-dose is stable and fat-free. The dry and uniform drug material is standard. The space is naturally from the inside and outside of the furnace. There is no heart. Let them be in the middle of the water. There is no bottom between the two doses. The swelling of the two is tested: low consumption, and the area with different materials after the test can be scanned for reference. In this section of the drug shadow account point ten, listen to the reading of the name energy
H1:a0 ar+a
According to the definition
determine the coefficient of quartz crystal at actual temperature
listen: 3
.…The length of this number
special object k point quantity:
——room required~
room temperature one sample length:
CB/T3074,4—2003
Working heat stop
4 Instruments and equipment
Figure 1 Relative method can be used
4.1 Thermosetting instrument: When the temperature reaches C, the error of repeated measurement is no more than C, 1×10, C thermal expansion can be obtained.
4.2 Vernier caliper U2mm
4.3T scale: range 0-1mm rotation.1m. 4.4 The temperature and pressure gauge shall have a measuring range of 0-1250 yuan, and a grade of 0.1. 5. Preparation of test specimens 5.1 The size of the test specimens shall be the same as that of the test specimens, and the upper diameter and side length shall be at least twice the length of the test specimens. However, the diameter or effective length of the test specimen shall not be less than 1 mm. A 5 mm long surface shall be formed into a square, and a hole with a true diameter of 1.3 mm and a depth of 1.3 mm shall be made at 2/3 of its length. 5.2 The test specimen shall have a length of no more than 0.1 mm, and the two end surfaces shall be perpendicular to the direction of the test specimen, and the parallelism shall not be greater than 3..mm/1.8mm. There shall be no visible cracks or cracks on the surface of the test specimens 5.3 The test specimens shall be taken and dug to meet the requirements of the calibration materials collection. 5.4 Number of samples taken
every 1: collect 2 half rows
6 test steps weak
6! Open the thermal imaging tube, only add protection to the village students with Wan Ying tube books, test stone fence English good, stone free plan stone car piece should be on a central axis, then put the thermoelectric test piece into the temperature measuring hole, turn off the state protective cover, also adjust the pointer of the sub-clothing, the small needle of the T meter should indicate that there is a slight swing in the situation (the small needle of the T meter should be at 2mr%.45.2. The heating power is self-sourced in the United States. The current is adjusted. Record the time, resistance change and enough volume. The group selected is dug in - with Huiqi gas when the temperature rises to 0, the gas will be opened and the signature will be changed to 51/6.3. When the short section rises to s0, the protection film (s0) is 5nin.), remember the volume, adjust the voltage to learn a little, when the ancestor raises about \, Xu Zhidao people oxygen, turn off the power. / Calculation of results bZxz.net
Test explosion temporary service effect (1 according to the above calculation, accurate to the small point - position support:
room temperature + a
a test control at a temperature of ~690 degrees of heat tunnel coefficient of the country, half the fire 4 light intensity (1): i. - the length of the column at room temperature, the unit is meter (nA... Cheng's expansion at the time, the unit is meter (m!aga
GB/T 3C74,4-2003
, that is, the average heat of the temperature range of room temperature to 300°C, the error of repeated tests shall not exceed ten! : Meaning "9
Test report
Formal test report shall include the following contents:
a! Sample number, format and source,
b) The thermal expansion coefficient of each sample is half of the average: the test personnel did not test last period.
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