Quality Requirements And Characteristics Of High Power Graphite Electrodes
Quality requirements and characteristics of high power graphite electrodes
When purchasing high-power graphite electrodes, we must do a good job of quality inspection, even in the acceptance can not have the slightest relaxation. The surface of the high-power graphite electrode is generally not more than two or two holes, and the joints, joint holes, and electrode surfaces within 100mm from the bottom of the holes are not allowed to have holes or cracks. The thread of the joint and the joint hole shall not exceed one drop, and the length shall not exceed 30mm. The surface of the high-power graphite electrode is not allowed to have transverse cracks, longitudinal cracks with a width of 0.3-1.0mm, and the crack length should not be greater than 5% of the electrode circumference, and should not exceed two pieces; Longitudinal cracks less than 0.3mm in width are not allowed to have two. For the surface area of the high-power graphite electrode, its width is less than one-tenth of the electrode circumference, and its length is less than one-third of the electrode length. In order to ensure the quality of high-power graphite electrodes, in addition to the above details, it is necessary to pay attention to packaging, identification, storage, transportation and quality certificates. Draw a safety line on the surface corresponding to the bottom of the joint hole of the finished high-power graphite electrode.
The degree of graphitization of graphite electrode can be measured by the resistivity of high power graphite electrode. The lower the resistivity of the graphite electrode, the higher the thermal conductivity and the better the oxidation resistance. The allowable current density of the graphite electrode is related to its resistivity and electrode diameter. The lower the resistivity of the graphite electrode, the higher the allowable current density, and the smaller the diameter.
The mechanical strength of high power graphite electrode can be divided into compressive strength, bending strength and tensile strength. The bending strength is a performance index related to the fracture of graphite electrode during use. In electric furnaces, when the electrode is in contact with a non-conductor, or due to collapse collision, strong crack vibration damage, effect, etc., the graphite electrode is often in danger of being broken. Graphite electrode has high bending strength and is not easy to break. When multiple electrodes are connected in series on the electrode column, the connection is subjected to great tension, so the tensile strength index of the joint should be specified.
