Analysis of the Causes of Broken Stainless Steel Mesh Belt in Towel Production Line

The stainless steel mesh belt is usually used for 8 weeks, and the stainless steel mesh belt begins to break due to nitriding and carbonization. In the common 304 stainless steel conveyor, it is usually operated for 28 hours under normal conditions in 870 flowing air, then switch to N2-3H2, and then hold for 2 hours, gradually increase to 1120 within 14 hours, and hold for 8 hours. At the beginning of the sintering of the parts, the oxygen contained in the atmosphere is about 3 ppm, which is about -55. (That includes about 20 ppm of water vapor). After about 8 weeks of use, the metal mesh belt began to break.






The thin chromium oxide layer on the surface of the stainless steel mesh belt is oxidized in the preheating zone. After entering the high temperature environment, it is reductive. Therefore, the surface oxide is reduced. After entering the cooling zone, the atmosphere is the same, but the oxidation is restored due to the temperature drop. The stainless steel mesh belt decomposes to produce CO in the high temperature area, which will cause carburization. The CO reacts with Cr in the stainless steel conveyor belt to form chromium carbide, and the nitrogen in the atmosphere also reacts with chromium to form chromium nitride. These compounds are hard and brittle compounds, and the life of the stainless steel mesh belt is greatly shortened.

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