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Views: 18 Author: Site Editor Publish Time: 2021-09-11 Origin: Site
13.What is the effect of resistivity performance on the use of electrodes in steelmaking?
The resistivity of the graphite electrode is a physical index that reflects the electrical conductivity of the electrode. It is related to the manufacturing process of the electrode. Our country has the qualitative regulation value to the graphite electrode resistivity of different specifications and varieties. In general, steel factories in the selection of a certain specification of the electrode, must choose in the range of national metallurgical standards specified resistivity, excessive electrical resistivity will cause the electrode to become red and hot when energized, increase electrode oxidation consumption.
14.What effect does the bulk density performance have on the use of electrodes in steelmaking?
The bulk density of graphite electrode reflects the dense state of the electrode and is closely related to the manufacturing process of the electrode. Our country has the qualitative regulation value for the bulk density of graphite electrode of different specifications and varieties. Low bulk density products, show that the overall structure of porosity is higher, the product at high temperature oxidation speed faster, easy cause increased electrode consumption, in general, when steel factories choose electrodes, the bulk density value of the electrode should be larger within the specified value. However, the higher the bulk density is not the better, because some electrodes with too high bulk density are sometimes prone to surface peeling, lumps and cracks during steelmaking due to poor thermal shock resistance, which will adversely affect steelmaking.
15. When steel factory use graphite electrodes, why should they prevent multiple products from being mixed?
Graphite electrodes used in steel factory are often supplied by multiple manufacturing companies. When multiple products are used in steelmaking, it will not only make it difficult for the steel factory to calculate the consumption of a single product, but also because of the different raw materials and manufacturing processes used by each manufacturer, the physical and chemical properties and processing tolerances of electrodes and nipples of various manufacturers have certain differences. Therefore, the matching tolerances generated during mixing can easily cause the electrodes to fall off and break off. The correct way is to use the products of one manufacturer alone, and then connect to the products of another manufacturer after the end. It is necessary to reduce the number of electrode replacements using different manufacturers. The electrode of the same manufacturer should be matched with the nipple of the manufacturer to prevent mixed use.
16.What are the characteristics of needle coke?
Needle coke is a high-quality carbon raw material, divided into coal-based and oil-based. Its surface has obvious strip lines. When broken, most of them are long needle-shaped fragments. The fibrous structure can be observed under a microscope. Hence it is called needle coke. Needle coke is easy to graphitize at a high temperature above 2000 degrees. Graphite electrodes made from it have low electrical resistivity, high bulk density, and low thermal expansion coefficient. It is the essential material for the production of ultra-high power electrodes and high power electrodes. The price of needle coke is much more expensive than that of ordinary coke, and is currently about 5-8 times higher.
