Effect of Antioxidant on Resistance to Ammonia Erosion of Carbon Sleeve in Continuous Annealing Furnace for Low-Temperature Grain-Oriented Silicon Steel Production

In continuous annealing furnace for low-temperature grain-oriented silicon steel production, carbon sleeve is used as one kind of the best hearth rolls to support and convey steel strip. However, the surface of carbon sleeve in nitriding zone is seriously corroded after a period of time, the surface roughness of carbon sleeve increases, the edge wears and even buildups appear, which seriously affects the surface quality of products. Based on the working conditions of carbon sleeve, the causes and mechanism of corrosion on carbon sleeve by ammonia, and effects of antioxidants on surface quality of low-temperature grain-oriented silicon steel are discussed. In terms of the resistance to ammonia, phosphate is not a good antioxidant for carbon sleeve in continuous annealing furnace for low temperature grain-oriented silicon steel production.