Method for heating Ni-containing steel and removing iron oxide scales
An iron oxide scale and heating furnace technology, which is applied in heat treatment furnaces, heat treatment equipment, heat treatment process control and other directions, can solve the problems of excessive scale, high viscosity, and difficult removal of high-pressure water, so as to ensure the surface quality and reduce the waste judgment rate. Effect
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[0032] The material of the slab is container steel plate, the chemical composition is C: 0.15%, Si: 0.30%, Mn: 1.49%, P: 0.014%, S: 0.002%, Ni: 0.90%, Cr: 0.29%, Mo: 0.28%, Nb: 0.014%, V: 0.04%, Ti: 0.009%. It belongs to the steel type with high Ni content. It is heated by a walking beam heating furnace, the thickness of the slab is 250mm, the way of entering the furnace is cold charging, and a weak oxidizing atmosphere (mixed atmosphere of blast furnace gas, coke oven gas and air) is used, and the ratio of blast furnace gas and coke oven gas is 1: 1. The excess air ratio is 1.05:1.1, and the furnace pressure is controlled at 0-15Pa by adopting slight positive pressure. The temperature at the end of the preheating stage is 550°C, the temperature at the end of the first heating stage is 1120°C, the heating time is 100 minutes, the gas hand valve of the burner is opened 50%, the air hand valve is opened 100%, and the flame of the flame adjustment burner is a long flame. The en...
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