The main differences between clay refractory bricks for coke ovens and ordinary clay refractory bricks are as follows:

I. Chemical composition

Clay refractory brick for coke oven: The Al₂O₃ content is usually above 40%, and some models such as JN-42 can reach more than 42%. This higher Al₂O₃ content makes it have higher fire resistance and corrosion resistance.

Ordinary clay refractory brick: Al₂O₃ content is generally between 30% and 48%. Its fire resistance and corrosion resistance are relatively low.

II. Fire resistance

Clay refractory brick for coke oven: The fire resistance is usually above 1730℃, and some models such as JN-42 can reach 1750℃.

Ordinary clay refractory brick: the fire resistance is generally between 1580℃ and 1770℃.

III. Apparent porosity

Clay refractory brick for coke oven: the apparent porosity is low, such as JN-42 ≤21.8% and JN-40 ≤22.3%. Low porosity makes it have better corrosion resistance and stability in high temperature environment.

Ordinary clay refractory brick: the apparent porosity is usually between 20% and 28%, with high porosity and relatively weak corrosion resistance.

IV. Load softening temperature

Clay refractory brick for coke oven: The load softening temperature (0.2MPa) is relatively high, such as JN-42≥1410℃ and JN-40≥1390℃.

Ordinary clay refractory brick: the softening temperature under load is generally between 1300℃ and 1350℃, and its stability in high temperature environment is relatively poor.

V. Thermal shock stability

Clay refractory brick for coke oven: It has good thermal shock stability, such as thermal shock stability of JN-42 ≥15 times (water cooling at 1100℃), and is suitable for use in environments with frequent temperature changes.

Ordinary clay refractory brick: thermal shock stability is average, usually about 10 times.

VI. Uses

Clay refractory brick for coke oven: specially designed for coke oven, suitable for high temperature parts of coke oven, such as carbonization chamber and combustion chamber. Its performance can meet the requirements of coke oven under high temperature, high pressure and frequent temperature changes.

Ordinary clay refractory brick: it is widely used in general industrial furnaces such as hot blast stove, blast furnace, glass kiln and cement kiln. Because of its relatively low fire resistance and corrosion resistance, it is usually used in parts with low temperature or low requirements for fire resistance.

VII. Economy

Clay refractory brick for coke oven: Because of its higher performance index and stricter production technology, the price is relatively high.

Ordinary clay refractory brick: the price is relatively low, suitable for cost-sensitive application scenarios.

VIII. Summary

Clay refractory bricks for coke ovens are superior to ordinary clay refractory bricks in chemical composition, refractoriness, apparent porosity, load softening temperature and thermal shock stability, and are more suitable for coke ovens with high requirements on fire resistance. Ordinary clay refractory bricks are suitable for the middle and low temperature parts of general industrial furnaces and have high economy.