Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel
Abstract
:1. Introduction
2. Material and Methods of Experiments
3. Results and Discussion
4. Conclusions
- (1)
- In the SCR system, ferritic stainless steel will be affected by high-temperature urea corrosion, forming an oxide layer and intergranular corrosion zone along the thickness direction. Nitrogen atoms penetrate into the matrix and combine with Cr to produce intergranular precipitation and intergranular corrosion. At the same time, a layer of oxide film will be formed on the surface during high-temperature oxidation process. Due to the thermal fatigue effect, the oxide film will gradually fall off, thus aggravating the corrosion of stainless steel.
- (2)
- As an unfavorable factor in steel, inclusions also seriously affect the high-temperature urea corrosion resistance. The results show that refining inclusions and reducing their content by slightly increasing of Nb content can improve the high-temperature urea corrosion resistance of ferritic stainless steel. The underlying mechanism is that the interface between inclusions and the matrix can induce the precipitation of chromium nitrides, resulting in the chromium equivalent of the matrix decrease and inducing micro interface corrosion. Accompanying with the effect of thermal fatigue, the corrosion thinning rate of ferritic stainless steel increases and the service life decreases.
- (3)
- Nb(C,N) encapsulates inclusions such as TiN to inhibit its coarsening, thus reducing the precipitation of chromium nitride at the interface of inclusions and matrix, so as to ensure the high-temperature urea corrosion resistance of ferritic stainless steel and reduce the tendency of crack initiation induced by inclusions.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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No. | C | Si | Mn | S | P | Cr | Nb | Ti | Al |
---|---|---|---|---|---|---|---|---|---|
steel-1 | 0.01 | 0.33 | 0.24 | 0.001 | 0.016 | 17.59 | 0.18 | 0.19 | 0.035 |
steel-2 | 0.01 | 0.24 | 0.13 | 0.001 | 0.017 | 17.93 | 0.33 | 0.22 | 0.032 |
steel-3 | 0.01 | 0.29 | 0.16 | 0.001 | 0.015 | 17.37 | 0.35 | 0.25 | 0.022 |
No. | Before Heat Treatment | After Heat Treatment | ∆Weight (g) | Thinning Rate (g/(s∙mm2)) | ||
---|---|---|---|---|---|---|
Weight (g) | Thickness (mm) | Weight (g) | Thickness (mm) | |||
steel-1 | 12.90 | 1.12 | 12.35 | 1.09 | 0.55 | 1.70 × 10−7 |
steel-2 | 13.37 | 1.16 | 13.01 | 1.14 | 0.36 | 1.11 × 10−7 |
steel-3 | 13.01 | 1.14 | 12.90 | 1.13 | 0.11 | 0.34 × 10−7 |
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Wang, X.; Lu, Q.; Zhang, W.; Xie, Z.; Shang, C. Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel. Metals 2021, 11, 1823. https://doi.org/10.3390/met11111823
Wang X, Lu Q, Zhang W, Xie Z, Shang C. Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel. Metals. 2021; 11(11):1823. https://doi.org/10.3390/met11111823
Chicago/Turabian StyleWang, Xuelin, Qingsong Lu, Wei Zhang, Zhenjia Xie, and Chengjia Shang. 2021. "Investigation on the Correlation between Inclusions and High Temperature Urea Corrosion Behavior in Ferritic Stainless Steel" Metals 11, no. 11: 1823. https://doi.org/10.3390/met11111823