Effect of Annealing Atmosphere on Scale Formation and Pickling Performance of 410 SS |
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| Authors: | Cheng S-Y Juan C-T Kuan S-L Tsai WT |
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| Affiliation: | (1) Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan, ROC;(2) Walsin Lihwa Steel Company, Tainan, Taiwan, ROC |
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| Abstract: | The compositions and microstructures of scales formed on the surface of 410 stainless steel after annealing at 850°C in dry air, moist air, N2 and 10% H2+N2 atmospheres were investigated. The pickling performances in 25 wt.% H2SO4 solution of hot-rolled and annealed 410 SS were also evaluated. The experimental results indicate that the scale formed in the moist air was the most difficult to remove, while descaling was easy when the stainless steel was annealed in a reducing atmosphere (10% H2+N2). The composition and microstructure of the oxides formed during annealing strongly affected the descaling performance. Both the stability of the scale in pickling solution and the effectiveness of descaling could be evaluated and predicted by measuring the change of electrochemical potential during acid pickling. The reactivation time determined from the potential-decay curve was found strongly dependent on the atmosphere in which 410 SS was annealed. |
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| Keywords: | 410 SS annealing atmosphere pickling H2SO4 |
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