Fire resistant brick arch brick monsary

Fire resistant brick brick wall (232x2). The middle of the furnace wall to open a 1500x1500 rectangular door. The door also built a height of about 1 meter wall. The top of the hole with what method of bearing a little better, and can not be made arched, with a strip of fire prefabricated block afraid of strength is not enough, because often come in and out. Direct use of steel, the furnace internal temperature is higher, up to 1000 ℃ or so, is the carbon steel can not stand, heat-resistant steel and too expensive. Like low-cement castables with steel made of prefabricated blocks, heat after the metal and refractory heat expansion coefficient of a great difference, may be resistant to cracking.