It has been proven that many factors affect the efficiency of the daily rolling mill also including the environmental elements of temperature and humidity, primary or ambient.
Therefore, in order to improve the working efficiency of the rolling mill, the narrow furnace tap hole has strict requirements for humidity, and in the case of no steel, when the door is closed, it can reduce air consumption and heat transfer, and can also reduce the cost of fuel coal and natural gas. If the humidity around the rolling mill is relatively high, it will cause the partial pressure of the water vapor to increase in the rolling mill furnace, and the furnace is reduced to make the uniform driving force to maintain the same heating. At this time, it is necessary to increase the length and width of the furnace, and then increase cost of investment.
Regarding the selection of the heating furnace is different, the appropriate relative temperature value is not the same, if the rolling mill is a walking furnace, because the residence time of the billet in the furnace is short, the rolling type in the same billet, the demand The greater the force of driving the heating rate in progress, the partial pressure of water at the general gas outlet must be less than half of the water vapor pressure of the external material at the outlet; if the regeneration furnace is replaced, the water vapor fraction at the outlet gas pressure is equal to that of the billet The water vapor pressure of the appearance is generally about 60%. Some grinding machines must ensure the required air velocity, therefore, when heating the structure of the furnace, the gas should be considered relative humidity and relative contact, in order to meet the requirements of a large gas velocity, more air volume can be used to reduce The relative humidity value increases the heating rate of the billet, reducing the temperature loss.
The reason is to control the inlet temperature of the rolling mill. The first is that the reinforced billet can quickly reach deformation rolling. Typically, the inlet temperature of the grinder should be maintained within the appropriate temperature range allowable within the slab, a temperature of 1150 degrees. Plates of the same type are allowed to pass through and vary with the furnace at the same inlet temperature. Depending on the same billet, the quenching heating temperature and holding time will be affected, so in the actual rolling process, the rolling temperature must be adjusted according to different requirements.