Protective gas for annealing of metal materials
A technology of protective gas and metal materials, applied in the production of hydrogen, etc., can solve the problems of uneven mechanical properties, unsatisfactory surface quality, long annealing cycle, etc., achieve shortened annealing cycle, improve internal quality and surface quality, and improve annealing effect of ability
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[0007] Ammonia decomposition equipment is used to prepare a mixture of hydrogen and nitrogen with a hydrogen content of 75% and a nitrogen content of 25%, which can be used as a protective gas after being dried and purified by a purification system.
[0008] The density of hydrogen is 1 / 14 that of nitrogen, and the thermal conductivity of hydrogen is 7 times that of nitrogen. Hydrogen is light in weight and strong in permeability. It can penetrate between the steel coil layers to give full play to the characteristics of large thermal conductivity and significantly improve heat transfer efficiency. Hydrogen is a reducing gas, which can reduce iron oxide to iron at high temperatures.
[0009] Make full use of the advantages and potential of hydrogen in annealing, improve the quality of annealing products and shorten the annealing cycle.
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