描述
UHP石墨电极用于电弧炉工业中的钢的再循环。其主要成分是高价值的针状焦，由石油或煤焦油制成。石墨电极以圆柱形状加工，并在每端加工有螺纹区域。以这种方式，可以使用电极接头将石墨电极组装到电极柱中。
为了满足更高工作效率和更低总成本的要求，大容量超高功率电弧炉正变得越来越流行。因此，直径超过500毫米的UHP石墨电极将占据市场主导地位。
特征
耐大电流，放电率高。
尺寸稳定性好，不易变形。
耐开裂和剥落。
高抗氧化和抗热冲击性。
High mechanical strength, low electrical resistance.
High machining accuracy, good surface finishing.
APPLICATION
Graphite electrodes are widely used for production of alloy steels, metal and other nonmetallic materials, etc.
DC electric arc furnace.
AC electric arc furnace.
Submerged arc furnace.
Ladle furnace.
A worker is operating the eccentric bottom tapping electric furnace with UHP graphite electrodes.Eccentric bottom tapping electric furnace
A picture about vacuum induction melting process.Graphite electrode for vacuum ladle furnace
Graphite electrodes are used in electric arc furnace steelmaking.Graphite electrode for electric arc furnace
SPECIFICATION
Table 1: Technical Specification of UHP Graphite Electrode
Dia.
(inch) Resistance
(≤, μ?·m) Density
(≥, g/cm3) Flexure Strength
(≥, MPa) Elastic Modulus
(≤, GPa) Ash Content
(≤, %) CTE
(100 °C – 600 °C)
(≤, 10-6/°C) Current Load
(A) Current Density
(A/cm2)
10 5.5 1.67 11 14 0.3 1.5 8100–12200 20–30
12 5.5 1.67 11 14 0.3 1.5 15000–22000 20–30
14 5.5 1.67 11 14 0.3 1.5 20000–30000 20–30
16 5.5 1.67 11 14 0.3 1.5 25000–40000 19–30
18 5.5 1.66 11 14 0.3 1.5 32000–45000 19–27
20 5.5 1.66 11 14 0.3 1.4 38000–55000 18–27
22 5.5 1.66 11 14 0.3 1.4 42000–66000 17–26
24 5.5 1.66 11 14 0.3 1.4 49000–76000 17–26
Table 2: Graphite Electrode Size & Tolerance
Diameter (mm) Length (mm)
Nominal Diameter Actual Diameter Nominal Length Tolerance Short Length
(inch) (mm) (max.) (min.) (rough spot)
10 250 256 251 248 1600/1800 ±100 -275
12 300 307 302 299 1600/1800
14 350 357 352 349 1600/1800
16 400 409 403 400 1600/1800/2000/2200
18 450 460 454 451 1600/1800/2000/2200
20 500 511 505 502 1800/2000/2200/2400
22 550 562 556 553 1800/2000/2200/2400
24 600 613 607 604 2000/2200/2400
SURFACE QUALITY
There should be less than two defects or holes on the electrode surface, the maximum size of which is mentioned in the below chart.
There should be no transverse crack on the electrode surface. For the longitudinal crack, the length should be less than 5% of the electrode circumference and the width should be 0.3 to 1.0 mm.
电极表面的黑色区域宽度应小于电极周长的1/10，长度应小于电极的1/3。
规格缺陷尺寸公称直径石墨电极（mm）
300-400 450-600
直径（mm）20-40
（<20 mm应该可以忽略不计）30-50
（<30 mm应该可以忽略不计）
深度（mm）5-10
（<5 mm应该可以忽略不计）10-15
（<10 mm应该可以忽略不计）
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