What factors will influence mechanical strength of graphite electrode
The relations of temperature to mechanical strength of graphite electrode.-- Carbographite
【Factors of influence mechanical strength of GRAPHITE ELECTRODE】
From normal temperature to 2500 ℃, the mechanical strength of GRAPHITE ELECTRODE increases with temperature. The mechanical strength at 2500 ℃ is about 1-2 times that of normal temperature. Figure 3-1 shows the mechanical strength of GRAPHITE ELECTRODE using petroleum coke as raw material with temperature The curve of rising (0-1500 ℃).
The reason why the mechanical strength of graphite products increases with increasing temperature can be explained as follows: 1. Graphite products will not produce local plastic deformation at low temperatures, so even if a relatively low load is given, it will cause cracking due to the very concentrated stress. However, when the temperature rises to a certain degree, due to the plastic state, local deformation occurs near the stress concentration point, and the stress is dispersed, even if a relatively large load is applied, it will not cause cracking. 2. Due to the large anisotropy of the linear expansion coefficient of graphite crystals, after cooling from high temperature, large stress will be generated inside the crystal grains. Due to the large value of the external stress superimposed on the internal stress, the strength of graphite at low temperature is more Low, but the stress gradually decreases when heated to a certain temperature, so the mechanical strength increases with increasing temperature.
【Quality System of Top GRAPHITE ELECTRODE Manufacturer-Carbographite Group】
Ringxing Group is China’s leading supplier of GRAPHITE ELECTRODE, electrode paste, CPC and carbon block. Possessing sophisticated production lines and inspection equipments, providing diverse lines of carbon metallurgical products backed by expert R&D technical support, we develop closer customer relationships and taking on a larger role in the total supply and manufacturing chain. Our products meet and exceed the challenges of thousands of applications, and continue to be innovated. We stand for the maxims of uncompromising quality, outstanding customer service and operational dependability. Our highest priorities for our customers are quality and cost. It is important that our customers benefit from our state-of-the-art products at unbeatable price-performance ratios. We implement custom solutions with the highest flexibility and precision. Our dedicated employees, the true carbon metallurgical material experts, make Carbographite successful globally.
As an influential and responsible supplier, we are able to provide our customers with more thoughtful services and technical support. Carbographite‘s strengths extend far beyond the processing of GRAPHITE ELECTRODE and electrode paste. Depending on customer requirements, the company offers services including: application-engineering consulting, selection of materials, field supervisors, and much more. Carbographite Group offers a complete set of carbon metallurgical products with a range of products for one-stop shopping. Decades of product optimization have turned Carbographite’s products into a highly perfected and cost-effective solution.
Customer’s satisfaction is our ultimate goal. We believe our devotion to carbon metallurgical industry will help us to achieve global leadership in providing world-class cost effective, superior quality services to customer in the world.
Using coal pitch as binder, our GRAPHITE ELECTRODE which is mainly made of petroleum coke and needle coke is being made through the process of calcination, compounding, kneading, pressing, baking, impregnation, graphitization and machining.
【Application of Carbographite GRAPHITE ELECTRODE】
1. Carbographite GRAPHITE ELECTRODE is being used in electric arc steelmaking furnace GRAPHITE ELECTRODE is mainly used in electric furnace steelmaking. Electric furnace steelmaking uses GRAPHITE ELECTRODEs to introduce current into the furnace. A strong current generates an arc discharge through the gas at the lower end of the electrode, and uses the heat generated by the arc to smelt.
2. Carbographite GRAPHITE ELECTRODE is being used in ore-heating furnaces GRAPHITE ELECTRODE ore-heating furnaces are mainly used to produce ferroalloys, pure silicon, yellow phosphorus, matte and calcium carbide, etc., which is characterized by electrical conductivity.
3. For resistance furnaces, graphitization furnaces for producing graphite products, melting furnaces for melting glass, and electric furnaces for producing silicon carbide are all resistance furnaces.
4. Used for processing a large number of GRAPHITE ELECTRODE blanks; also used for processing into various crucibles, graphite boats, hot die casting molds and heating elements for vacuum electric furnaces, etc...
【GRAPHITE ELECTRODE Specifications】
Resistivity: 5.8-6.6 μΩm
Modulus of Rupture: 10.0-13.0 Mpa
Young's Modulus: 8.0-12.0 Gpa
Bulk Density: 1.64-1.68 g/cm3
CTE: 1.6-1.9 10-6/℃
【Main Properties of Carbographite GRAPHITE ELECTRODE】
Strict consumption control；Low GRAPHITE ELECTRODE consumption.
High temperature strength.
Low thermal expansion coefficient.
Good thermal conductivity and electrical conductivity.
Dense and equal structure.
High resistance to oxidation.
High mechanical strength.
High resistance to thermal shocks.
Exact mechanical machining.
Manufacturing within narrow tolerance.
【Using Guide for Carbographite GRAPHITE ELECTRODE】
Being hard and brittle, artificial GRAPHITE ELECTRODE shall be specially handled. Proper operation may reduce the consumption and cost.
A, Use special hoist tools to hoist GRAPHITE ELECTRODE. It is strictly forbidden to prize electrode ends up with crowbar. It must be handled with great care during transportation to avoid damage.
B, GRAPHITE ELECTRODE must be kept away from being moistened or wetted by rain, snow and water, and must be kept dry. It must be dried in the furnace before use. The drying temperature in the furnace shall be less then 100℃.The drying period shall be not less than 48 hours.
C, Not to be stored up near clay,slag etc.to avoid surface pollution and increasing resistivity.
D, Carefully checking before connection, make sure that the socked and nipple thread is not damaged, nipple pitch plug is in. Nipple screw shall not be damaged during lifting.
E, Blow the nipple and socket threads with compressed air.
F,GRAPHITE ELECTRODE must be connected contacted closely and straightly.Use moment spanner for connecting electrode with suitable force.The gap between electrodes shall less than 0.4mm.
G, The holding device must hold the electrode tightly,good contact and no arc.Otherwise,the connecting area will get red and oxidized and thin,leading breakage.
H, Threaded portion of nipple socket shall not be damaged during hoisting by metal plug.Hoisting plug shall spin out and keep nipple socket clean.
I, Lifting device of electrode must move stably when moving electrode.carefully check the position of furnace cover after being repaired.To seal the cover with refractory to prevent up electrode from being oxidized by fire.
J, The holding device of electrode shall hold the electrode beyond the socket area.
For charging the furnace, the large scrap should be put at the bottom, the small one on the top, Charge material with low electric conductivity shall not been put on the top. In the course of melting, un-melted material shall be taken in time to avoid electrode breaking by falling material.