GB/T 3074.4-2003 English PDF (GBT3074.4-2003)

This Part specifies the principle, apparatus, specimen preparation, test procedures and calculation method for the determination of the coefficient of thermal expansion of graphite electrodes.

GB/T 3074.4-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.040
Q 51
Replacing GB/T 3074.4-1982
Method for the Determination of the Coefficient
of Thermal Expansion of Graphite Electrodes
ISSUED ON. SEPTEMBER 12, 2003
IMPLEMENTED ON. APRIL 1, 2004
Issued by. General Administration of Quality Supervision, Inspection and Quarantine
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Definition and Principle ... 4
4 Apparatus ... 6
5 Specimen Preparation ... 6
6 Test Procedures ... 7
7 Result Calculation ... 7
8 Test Error ... 8
9 Test Report ... 8
Foreword
GB/T 3074 Method for the Determination of Graphite Electrodes is divided into four parts.
---- Method for the Determination of the Flexure Strength of Graphite Electrodes; --- Method of the Determination of the Elastic Modulus of Graphite Electrode; --- Method of the Determination of the Oxidation of Graphite Electrode; ---- Method of the Determination of the Coefficient of Thermal Expansion (CTE) of Graphite Electrode.
This Part replaces GB 3074.4-1982 Method of the Determination of the Coefficient of Thermal Expansion (CTE) of Graphite Electrode.
Compared with GB 3074.4-1982 Method of the Determination of the Coefficient of Thermal Expansion (CTE) of Graphite Electrode, this Part mainly has the following changes.
--- Prepare the operating method mainly based on the vertical relative method instrument.
--- Change the average coefficient of thermal expansion from 100°C ~ 1000°C to room temperature ~ 600°C.
--- Expand the test range.
--- Add the equipment schematic diagram.
This Part was proposed by China Iron and Steel Association.
This Part shall be under the jurisdiction of China Metallurgical Information and Standardization Research Institute.
Drafting organizations of this Part. Lanzhou Carbon (Group) Co., Ltd., and China Metallurgical Information and Standardization Research Institute.
Chief drafting staffs of this Part. Liu Xinrong, Gao Fengping, Zhang Zhiqiang, Li Tongqin, and Sun Wei.
This Part was first-time published in 1982.
Method for the Determination of the Coefficient of
Thermal Expansion of Graphite Electrodes
1 Scope
This Part specifies the principle, apparatus, specimen preparation, test procedures and calculation method for the determination of the coefficient of thermal expansion of graphite electrodes.
This Part is applicable to the average coefficient of linear thermal expansion of graphite electrode with ordinary power, high-power and ultra-high-power; and other solid carbon materials with total expansion amount not exceeding 1mm at 600°C; the temperature range is room temperature ~ 600°C.
2 Normative References
The provisions in following documents become the provisions of this Part through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Part, however, parties who reach an agreement based on this Part are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB/T 1427 Sample Method of Carbon Material
3 Definition and Principle
3.1 Definition
Coefficient of thermal expansion indicates variable for the degree of thermal expansion of the material; namely, when temperature raises 1°C, the solid material with unit length caused expansion amount along certain direction, which is the linear expansion coefficient of the material along that direction.
3.2 Principle
See schematic diagram (Figure 1), specimen and quartz reference substance are mounted on the same base; while the other end of the specimen is in contact with the mandrel. When furnace is heated, specimen, mandrel, and reference substance are