The international standard refractory brick code for SK at the beginning of the model, which, SK-34 aluminum content corresponding to the domestic 48 content, SK-36 corresponding to the domestic 55 content, SK-38 content of 75 refractory bricks. There are 48%, 55%, 60%, 65%, 73%, 75% and 80% of the high alumina bricks according to their aluminum oxide (Al2O3) content.
According to the content of alumina,55 or less called clay brick, is a neutral refractory material, from bauxite or other high alumina content of the material made from the firing. With high thermal stability, fire temperature at 1700 C, for glass melting furnace, cement rotary kiln, steel furnace lining. Of course, there are some high-soft, low creep, low porosity of high-alumina clay brick, high-alumina brick products, according to the use of different needs in the production of raw materials on the ratio is essential. ǀ grade and ǁ grade high alumina brick firing temperature is also much higher than the clay brick, in the actual test ǀ grade and ǁ grade high alumina brick almost used for the temperature of 1500-1600 C tunnel kiln.
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Item |
Index |
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|
International Code Name |
SK34 |
SK36 |
SK37 |
SK38 |
SK40 |
|
Chinese Code Name |
LZ-48 |
LZ-55 |
LZ-65 |
LZ-75 |
LZ-80 |
|
Al2O3 ,% |
≥48 |
≥55 |
≥65 |
≥75 |
≥80 |
|
Fe2O3, % |
≤2 |
≤2 |
≤2 |
≤2 |
≤2 |
|
Refractoriness ℃, min |
1750 |
1770 |
1790 |
1790 |
1790 |
|
Apparent Porosity % |
≤22 |
≤22 |
≤23 |
≤23 |
≤21 |
|
Bulk Density g/cm3 |
2.25-2.35 |
2.25-2.35 |
2.25-2.35 |
2.25-2.35 |
2.25-2.35 |
|
Cold Crushing Strength Mpa |
≥39 |
≥44 |
≥49 |
≥54 |
≥65 |
|
0.2Mpa Refractoriness Under Load |
≥1420 |
≥1470 |
≥1500 |
≥1520 |
≥1530 |
|
Permanent Linear Change On Reheating （%）1500℃X2h |
+0.1~-0.4 2hx1450℃ |
+0.1~-0.4 |
+0.1~-0.4 |
+0.1~-0.4 |
+0.1~-0.4 |
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