The difference between UHP graphite electrode and HP graphite electrode

The raw materials of UHP and HP graphite electrodes are different, resulting in different physical and chemical indicators of the graphite electrodes produced. They are suitable for steelmaking in ultra-high-power electric arc furnaces and high-power electric arc furnaces. Let's introduce what uhp electrodes represent. The difference between UHP graphite electrode and HP graphite electrode.

1. What does the uhp electrode represent?

UHP is the abbreviation of ultra high power in English, representing the category of ultra-high power graphite electrodes. According to the power, graphite electrodes are divided into: RP ordinary power graphite electrodes, HP high power graphite electrodes and UHP ultra-high power graphite electrodes.

The three graphite electrode models are suitable for electric arc furnaces of different power levels. RP is suitable for ordinary power electric arc furnaces with a melting capacity of 300Kv.A/t per ton, and HP is suitable for high-power electric arc furnaces with a melting capacity of 400Kv.A/t per ton. UHP is suitable for ultra-high power electric arc furnaces with a melting capacity of 500~1200Kv.A/t per ton.

RP electrode is produced by ordinary grade petroleum coke, which has low requirements on raw materials and low graphitization temperature, so it has high resistivity, large linear expansion coefficient, poor thermal shock resistance, and low allowable current. It is suitable for ordinary steelmaking. use.

HP electrode uses high-quality petroleum coke plus needle coke and coal pitch, etc. After impregnation treatment, the performance is higher than that of RP electrode, the resistivity is relatively low, and the allowable current density is large.

UHP graphite electrode is produced by high-grade needle coke, the graphitization temperature is as high as 2800~3000°C, and the graphitization heat treatment is carried out in the inner string graphitization furnace, so it has lower resistivity, small linear expansion coefficient and excellent resistance to The thermal shock performance makes it free from cracking and breaking, allowing the passage of high current density, which will shorten the melting time and improve production efficiency.

2. The difference between UHP graphite electrode and HP graphite electrode

1. The raw materials of the two are different, resulting in different physical and chemical indicators and allowable current capacity

2. The production cycle of UHP graphite electrode is longer than that of HP electrode, and it needs to go through three immersion and four bakes, which also leads to higher cost than HP graphite electrode.

3. There are few manufacturers of graphite electrodes with specifications above UHP 600mm. In the early days, they relied on imports for a long time. Now the production diameter of Dan carbon graphite electrodes can reach up to 800mm.

4. The smelting time is shortened. For example, it takes 60 minutes for a 10T ton electric arc furnace to smelt molten steel with HP electrodes, and only 45 minutes for UHP graphite electrodes, which not only shortens the time, reduces power consumption, but also consumes less electrodes.