Oxidation refers to the role of CO2, H2O, and O2 in the furnace gas during heating. That is, burning), reduce the material rate, and at the same time, the accumulation of iron oxide skin will cause the erosion of refractory materials and reduce the service life of the stove. In addition, the heating rate of iron oxide skin is much lower than the metal, affecting the heating of the billet.
Iron oxide skin is the oxidation product of steel, which is divided into three layers of Fe2O3, Fe3O4, and Feo from the outside to the inside. The test results proved that FE2O3 accounted for 10%, Fe3O4 accounted for 50%, FEO accounted for 40%, and the melting point was about 1300-13501 ° C.
Factors affecting metal oxidation are tube billet heating temperature, heating time, and gas building in the furnace. Among them, the atmosphere and heating temperature in the furnace have a greater impact, and the heating time mainly affects the amount of steel burning.
(1) The temperature of the steel pipe temperature steel does not oxidation before 800 ° C, and the temperature of the tube is significantly accelerated by the temperature above 800 ° C;
(2) High temperature stay time, the longer the tube's blank stay in the high temperature area, the more oxidized and burning, the more serious;
(3) The more intense the atmosphere of the furnace gas building, the more severe the oxidation and burning.
