Refractory for steel rolling

The refractory materials used in steel rolling and forging are mainly heat treatment furnaces. According to the use of steel rolling heat treatment furnace and forging with a variety of heat treatment furnace. The heat treatment furnaces for intermittent operation include chamber furnace, car bottom furnace, hood furnace, well furnace, flowing ion furnace, muff furnace, etc. For continuous operation of heat treatment furnaces have straight (push rod) furnace, roller bottom furnace, rotary bottom furnace, stepping furnace, chain furnace, etc. The temperature of these heat treatment furnace is not high, heating furnace general service temperature does not exceed 1300℃, so for the general refractory resistance to such a temperature is no problem, but the insulation and service life become the main body of these equipment. That is, the heat treatment furnace to more heat preservation, more durable and convenient construction direction. Specifically, the lining of these equipment is made of aluminum-silicon refractories with an alumina content of 36% to 75%. For reducing atmosphere in the furnace, the requirement of lining material of iron oxide content as low as possible, so that to avoid in the process of using the reduction of Fe2O3 in the refractory metal iron and Fe3C, occurring under the catalysis of Fe3C co = CO2 + C (sedimentary) reaction, fibrous carbon deposition in refractory porosity, crack and defect caused by carbon deposition volume expansion of refractory material embrittlement, crack extension, eventually making material split even pulverization. For heat preservation with light brick, light castable material, fiber felt and fiber coating, because of small bulk density, low thermal conductivity and small heat capacity, after construction without oven and direct use, improve heat preservation performance and reduce energy consumption, this is heat treatment furnace to improve the most significant place, this is also the development trend in recent years. But in the construction aspect, develops from the brick masonry to the pouring material aspect. Overall casting furnace lining, that is, improve the sealing and heat preservation effect of the furnace, also improve the service life, the general brick heating furnace lining service life of a year, and castable lining service life of 2~3 years, or even longer. Or castable lining less stop furnace, repair times than the brick lining less than 50%, for improving the operation rate of the furnace is very meaningful.