Novel internal oxidation behavior of new 17Cr2Ni2MoVNb steel

Yi, Huaqing; Yang, Yi; Yin, Bingbing; Yin, Fucheng; Hu, Jing; Liang, Mengtian; Yang, Yijing; Zhang, Jun

doi:10.1016/j.corsci.2023.111126

Cited by 5 publications

(1 citation statement)

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“…[8,9] Diverse oxides with different valence states and structures of FeO, Fe 3 O 4 , and Fe 2 O 3 can form a double-layer structured film on steel during oxidation process. [10][11][12][13][14][15] The FeO in the inner oxide film is prone to softening at high temperatures, providing good lubrication during high-temperature pipe piercing, [16] while the outer film with the main composition of Fe 2 O 3 is brittle and easily peels off. [8,17] In order to improve the quality of the oxide film, Zheng [18] developed a novel two-stage oxidation process for preparation of the piercing plug with the first oxidation stage mainly to promote the rapid growth of the oxide film, and then followed by the second reduction stage to improve the structure of the oxide film to not easy to scale off.…”

Section: Introductionmentioning

confidence: 99%

Influence of Furnace Pressure on the Growth Characteristic of Oxide Film on Piercing Plug Steel

Lu,

Tian

2024

steel research int.

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Different oxidation processes are carried out by using 20Cr2Ni4 piercing plug steel to study the influence of furnace pressure on the growth characteristic of oxide film in high‐temperature C2H5OH–H2O atmosphere. The results show that oxide film under different processes shows clearly two layers. The inner film is porous with the main constituents of FeO and Fe3O4 while the outer film is dense with large bubbles. The elemental Ni aggregates as a dot‐like substance in the inner oxide, where the enrichment of Cr lags behind the frontier boundary of Ni distribution. It is found that the thickness of the oxide film shows a parabolic relationship with product of the square root of oxidation time and furnace pressure. High furnace pressure can keep the pressure balance of the bubbles to swell to sufficient size, but may cause cracking during the relief process of pressure.

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