Effect of Expansion Deformation on the Mechanical Properties and Corrosion Resistance of an AISI 304 Stainless Steel Tube in Water from an Oilfield
Round 1
Reviewer 1 Report
The study presented in the article, for the most part, duplicates the results already obtained by other various research teams. For example, the following works are known (Onur Ay, Investigation of Mechanical Properties of AISI 304 Stainless Steel Depending on Cold Deformation Rate, Phase Quantity and Heat Treatment Processes, 2020; Yang Li, Effects of Surface Severe Plastic Deformation on the Mechanical Behavior of 304 Stainless Steel, 2020; Ingmar Bösing, The influence of microstructure deformation on the corrosion resistance of cold formed stainless steel, 2018) as well as similar works were published in the framework of the studies described in the article. It is not clear from the text of the article what the novelty of the performed research is? The review of works in the field of research needs to be radically finalized. Also, the text of the article needs to be radically revised, to add new results in the field of research on 304 steels.
Author Response
Thank you very much for your suggestions. I think I need to clarify my research background with you. Unlike the other researches as you mentioned, our paper pays more attention to the study ofthe influence of the existing expansion process of solid expandable tube on the corrosion resistance and mechanical properties of 304 stainless steel tube was studied. The solid expandable tube must undergo a certain amount of plastic deformation before formal service because of its usage, and the deformation degree is mainly controlled by the well profile. In our paper, we are mainly discussing the feasibility of 304 stainless steel pipe used as solid expandable tube because we know that 304 stainless steel has excellent work-hardening ability, and the plastic deformation will reduce its corrosion resistance. High work-hardening ability may lead to the increase of the working pressure of the expansion field operation, which is an undesirable result for the field operators. As for corrosion resistance, we would like to know the extent of corrosion resistance reduction caused by expansion deformation and whether it can meet our expectations for corrosion resistance. So a series of experiments were designed to verify these problems. According to the experimental results, 304 stainless steel pipe can be qualified as solid expandable tube for the corrosion conditions mentioned in this paper, although its corrosion resistance will be reduced due to expansion deformation.
However, your suggestions have made us pay more attention to the frontier research results in this field. These days, we have also read a certain number of relevant literatures, which is very beneficial to our follow-up research. For example, we can try to reduce the adverse effect of expansion deformation on the corrosion resistance of 304 stainless steel by controlling the expansion deformation parameters, and try to use the anticorrosion alloys with high stacking fault energy to reduce the adverse effect of plastic deformation on the corrosion resistance. According to your suggestions, we have also revised our manuscript.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Thanks to the authors for the interesting manuscript. The manuscript needs some minor changes for improvement.
1. In the introduction and discussion part, more references are to be added to provide corrosion resistance values of other alloys which are currently in use for the SET application.
2. Line 287 - a reference to 10 - The referred article talks about titanium alloys, whereas the sentence is discussing stainless steel. The authors are required to find and add relevant references.
3. Reference to figure numbers - In lines 248 and 274, figure 2 is referred wrongly. Please check and correct.
4. The sentence in lines 236-238 is not clear. Please rephrase.
Author Response
Please see the attachment.
Author Response File: 
Author Response.docx
Reviewer 3 Report
Title: Effect of expansion deformation on mechanical properties and corrosion resistance in oil-field produced water of AISI 304 stainless steel tube
Journal: Coatings (ISSN 2079-6412)
Manuscript ID: coatings-1850015
In the manuscript, the authors have reported the changes in microstructure, mechanical properties and corrosion resistance of AISI 304 SS tube before and after expansion deformation were tested, especially its corrosion behavior in the representative produced water of an oilfield in China. However, after careful evaluation of this manuscript, I recommend it for publication in this journal after major revisions as suggested.
Authors can consider the following comments as given below,
1. It is not mentioned that the XRD of the samples was performed with which target material/radiation. The peak position will be changed according to the radiation used.
2. The TEM images are shown in Fig.3. But in the Results as well as Discussion section they are referred to as Fig.2.
3. Several features like dislocation, stacking fault, twin, and shear band should be labeled properly in the TEM images.
4.In line 179 it is mentioned that the elongation before expansion is 65%, but in table 3 it is mentioned as 62.5%. But in the stress-strain plot (Fig.4) the curve shows the strain till fracture is less than 60%. Please justify the data.
5. Line 292,301: what is stain-induce martensite? Is it a typo error or any other special feature?
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The authors of the article did not drastically change the text of the article in accordance with the previously mentioned remarks.
The study presented in the article, for the most part, duplicates the results already obtained by other various research teams. For example, the following works are known (Onur Ay, Investigation of Mechanical Properties of AISI 304 Stainless Steel Depending on Cold Deformation Rate, Phase Quantity and Heat Treatment Processes, 2020; Yang Li, Effects of Surface Severe Plastic Deformation on the Mechanical Behavior of 304 Stainless Steel, 2020; Ingmar Bösing, The influence of microstructure deformation on the corrosion resistance of cold formed stainless steel, 2018) as well as similar works were published in the framework of the studies described in the article. It is not clear from the text of the article what the novelty of the performed research is? The review of works in the field of research needs to be radically finalized. Also, the text of the article needs to be radically revised, to add new results in the field of research on 304 steels.
Author Response
Please see the attachment.
Author Response File: Author Response.docx
Reviewer 3 Report
The authors have made detailed improvements. Now the manuscript can be accepted in its current form for journal publication.
Author Response
Thank you very much.
