Use of waste iron and steel industry in the preparation of materials used in construction, such as sand-lime brick, can significantly save energy. An integral part of the process in the manufacture of sand-lime brick is a heat treatment to a large extent determines the construction and mechanical properties of finished products. To simulate the process of heating the work piece using a technique based on the solution of differential equations of the temperature field in the absence of internal heat sources. Offer a solution to the equation of temperature field with certain conditions for the unique method of finite differences. Aquarter of the work piece based on the conditions of geometrical and thermal symmetryis consideredin the modeling process.