Study on high temperature oxidation behavior of weathering steel Q235NH

Gong Li; Bao Siqian; Zhao Gang; Mei Peng; Cao Shuwei; Deng Hangzhou; Chen Quan

doi:10.7513/j.issn.1004-7638.2021.04.028

Volume 42 Issue 4

Aug. 2021

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Gong Li, Bao Siqian, Zhao Gang, Mei Peng, Cao Shuwei, Deng Hangzhou, Chen Quan. Study on high temperature oxidation behavior of weathering steel Q235NH[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 169-174. doi: 10.7513/j.issn.1004-7638.2021.04.028

Citation:

Gong Li, Bao Siqian, Zhao Gang, Mei Peng, Cao Shuwei, Deng Hangzhou, Chen Quan. Study on high temperature oxidation behavior of weathering steel Q235NH[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(4): 169-174. doi: 10.7513/j.issn.1004-7638.2021.04.028

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Study on high temperature oxidation behavior of weathering steel Q235NH

doi: 10.7513/j.issn.1004-7638.2021.04.028

1.
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei,China
2.
The Second Rolling Plant of Anyang Steel, Anyang 455006, Henan,China

Received Date: 2021-03-22
Publish Date: 2021-08-10

Abstract

Abstract

To clarify the high temperature oxidation behavior of weathering steel Q235NH containing Si and Cr, the oxidation experiment of weathering steel Q235NH was carried out at 700 ～ 1 200 ℃. The composition of iron oxide scale was analyzed by optical microscope (OM),scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The evolution process of oxidation structure was analyzed by investigating oxidation kinetics curve. The results show that the iron oxide scale formation of Q235NH steel complies with the parabolic law, and its activation energy is 146 kJ/mol. The iron oxide scale structure consists of thin Fe₂O₃ and Fe₃O₄ layers in the outermost layer and thick FeO and massive proeutectoid Fe₃O₄ layers in the middle layer. In addition, when the heating temperature is lower than 1 100 ℃, a thin continuous silicon chromium rich layer will be formed between the scale and the substrate, which will hinder the outward diffusion of iron ions, making the oxidation more difficult. However, when the heating temperature is greater than 1100 ℃, the silicon chromium layer will be destroyed, which will promote the oxidation.
- weathering steel,
- high temperature oxidation,
- ferrous silicate,
- section morphology

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References(10)

References

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