High temperature oxidation resistance of Super304H austenitic stainless steel

doi:10.13251/j.issn.0254-6051.2023.01.014

Abstract

Abstract: Oxidation mechanism of Super304H austenitic stainless steel was studied by high temperature oxidation test at 550-800 ℃ and combining with the law of oxidation kinetics. The results show that the oxidation mass gain curve of the Super304H austenitic stainless steel follows the parabola law at 550-800 ℃, the trend of mass gain is the most obvious within 60 h at 750-800 ℃, and the mass gain is up to 0.005 mg·mm^-2 after 100 h. A dense oxide film is gadually formed at 550-750 ℃, which is mainly composed of Cr₂O₃ and Fe_3-xCr_xNiO₄ mixed oxides and a small amount of CuCrMnO₄. Increasing temperature makes the Super304H austenitic stainless steel promote the selective oxidation of Cr, and make the Cr₂O₃ protective film crack. At 800 ℃, the exposed Fe matrix reacts with oxygen atoms to form tumor Fe₃O₄, and the oxide film is thick and peels off. when strain rate is 3.2×10^-4 s^-1, the tensile strength of the stainless steel decreases with the increase of oxidation temperature, and reaches 350 MPa as the maximum at 600 ℃. The elongation is the best at 700-750 ℃, which is 28%.

Key words: Super304H austenitic stainless steel, high temperature oxidation resistance, oxide film, oxidation mechanism

CLC Number:

TG142

Li Lingxiao, Zhao Yanjun, Zhang Jingrui, Li Pingzhen, Feng Wei, Ye Boxi. High temperature oxidation resistance of Super304H austenitic stainless steel[J]. Heat Treatment of Metals, 2023, 48(1): 80-86.

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