Diffusion deoxidation: powdery deoxidizer added to the slag, Shandong composite silicon carbide deoxidizer, by reducing the oxygen potential slag composite silicon carbide deoxidizer, metastatic spread of oxygen in molten steel to the slag, thereby reducing the molten steel An oxygen content deoxy method. Advantages: deoxygenation reaction is carried out in the slag, Hebei composite silicon carbide deoxidizer, the product is present in the slag; less residual toxic steel inclusions, Liaoning composite silicon carbide deoxidizer, high cleanliness of molten steel; Disadvantages: deoxy slow, long time, consume more oxygen scavenger. Critical temperature control: how to add coolant and adjust the gun position, so that changes in temperature and composition of the molten steel to reconcile, while meeting the requirements of blowing end. The purpose of the temperature control process: to make the process of blowing temperature equilibrium, guaranteed to operate smoothly.