Blowing of First Reheating Furnace
Blowing is a crucial operation in heat treatment, which requires stringent quality management and control. Blowing of first reheating furnace is one of the most important operations, which should not be ignored. Good blowing will ensure the strength, stability and quality of the product; while poor blowing may significantly reduce the strength and quality of the product, leading to increased cost and decrease safety.
Therefore, in order to ensure the quality of the product after blowing of the first reheating furnace, certain requirements must be met. Firstly, the temperature of the furnace should be strictly controlled. It is generally recommended to keep the temperature of the furnace between 1100℃ and 1200℃. Secondly, there should be an adequate oxygen supply in order to sustain the combustion temperature and to allow for efficient and complete burning of the fuel. The oxygen supply should be sufficient for about 20 minutes at 125-150 psi. Thirdly, proper use of the fireproof material should be observed to prevent the overheating of the furnace lining and the oxidation of the steel. Fourthly, after the blowing is finished, the furnace should be cooled down slowly to around 800℃ in order to minimize thermal shock and prevent temperature gradients in the material. This process should be monitored to ensure that no cracks form due to sudden cooling.
Finally, the furnace should be inspected after every procedure. A thermocouple should be used to measure the temperature of the furnace at specific points, and these readings should be logged in order to ensure the uniformity of the temperature and other conditions in the furnace. Moreover, the interior of the furnace should be inspected for any signs of damage due to overheating, pin hole formation, oxidation, or other problems.
In summary, blowing of first reheating furnace is an important operation that requires strict quality control and management. The temperature, oxygen supply, fireproof material, cooling and inspection should all be given careful attention in order to ensure the strength and quality of the product and to prevent unnecessary costs.
