项目 | 指标 | ||||||||
N-1 | N-2a | N-2b | N-3a | N-3b | N-4 | N-5 | N-6 | ||
耐火度,锥号CN | ≥176 | ≥174 | ≥174 | ≥172 | ≥172 | ≥170 | ≥166 | ≥158 | |
荷重软化开始温度/℃(0.2MPa) | ≥1400 | ≥1350 | ≥1320 | ≥1300 | |||||
重烧线变化/% | 1400℃,2h |
+0.1 -0.4 |
+0.1 -0.5 |
+0.2 -0.5 |
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1350℃,2h |
+0.2 -0.5 |
+0.2 -0.5 |
+0.2 -0.5 |
+0.2 -0.5 |
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显气孔率/% | ≤22 | ≤24 | ≤26 | ≤24 | ≤26 | ≤24 | ≤26 | ≤28 | |
常温耐压强度/MPa | ≥30 | ≥25 | ≥20 | ≥20 | ≥15 | ≥20 | ≥15 | ≥15 | |
抗热震性次数 | N-2b、N-3b必须进行此项检验,将实测数据在质量证明书中注明 |