What is mullite refractory brick?

What is the temperature of an ordinary flame? Generally speaking, the highest temperature of the flame is about 500°C. Of course, the flame temperature of different burning materials will be different. What is the maximum temperature range of mullite refractories? According to the test standard, the refractory temperature of mullite refractory bricks should be around 1200℃-1700℃! What is this concept? The ironmaking temperature is generally around 1300-1500℃. Laishi refractory bricks can withstand the test of molten iron for a certain period of time.

The identification of mullite refractory bricks is mainly divided into 7 grades, mainly mg-23, mg-25, mg-26, mg-27, mg-28, mg-30 and mg-32. When the heating wire change rate is less than 2%, the corresponding test temperature is 1230℃, 1350℃, 1400℃, 1450℃, 1510℃, 1620℃, 1730℃.

Secondly, the physical and chemical test indicators of mullite refractory bricks mainly include alumina content, iron oxide content, bulk density, compressive strength at room temperature, heating permanent linear change rate, thermal conductivity, 0.05Mpa load softening temperature, anti-stripping performance and other indicators. It is pointed out that measuring the linear density and linear density of mullite refractories is the key to measuring its fire resistance.

Then, the inspection indicators for the appearance and allowable deviation of mullite refractory bricks mainly include shape and size, allowable size deviation, twist deviation, corner length, side length, hole diameter, crack length and relative edge deviation. It should be noted that for some special types of mullite refractory bricks, the allowable crack length can be determined according to the supply and demand agreement.