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项 目
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单位
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公称直径，mm
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普通功率石墨电极
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高功率石墨电极
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超高功率石墨电极
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300
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350～600
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300/350/400
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450/500
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400/450/500/550/600/700
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优级
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一级
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优级
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一级
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电阻率
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电极
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μΩ·m
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≤9.0
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≤10.5
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≤9.0
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≤10.5
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≤7.0
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≤7.5
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≤5.8
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接头
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≤8.5
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≤8.5
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≤6.5
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≤6.5
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≤4.3
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抗折强度
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电极
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ΜРa
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≥7.8
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≥6.4
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≥10.5
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≥9.8
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≥8.3
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接头
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≥13.0
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≥13.0
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≥14.0
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≥14.0
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≥20.7
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弹性模量
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电极
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GРa
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≤9.3
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≤9.3
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≤12.0
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≤12.0
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≤12.0
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接头
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≤14.0
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≤14.0
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≤16.0
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≤16.0
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≤19.0
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体积密度
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电极
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g∕㎝3
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≥1.52
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≥1.52
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≥1.60
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≥1.60
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≥1.68
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接头
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≥1.68
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≥1.68
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≥1.70
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≥1.70
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≥1.78
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热膨胀系数
（100～600℃）
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电极
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10-6∕℃
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≤2.9
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≤2.9
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≤2.4
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≤2.4
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≤1.8
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接头
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≤2.8
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≤2.8
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≤2.2
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≤2.2
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≤1.4
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灰分
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%
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≤0.5
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≤0.5
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≤0.3
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≤0.3
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≤0.3
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