The relations of temperature to 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.
shengmiao
Harm of too high temperature: when molten steel out of cooper mold, the billet shell is thin and easy to break out; The accelerated erosion of refractory can ea
shengmiao
1. The barrier function (mainly completed by the liquid slag layer) isolates the contact between air and molten steel, blocks the secondary oxidation of molten
shengmiao
In continuous casting, low corrosion resistance often occurs, which directly leads to uneven composition and will eventually affect the smelting quality. In or