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Steel resistant to sulfate-reducing bacteria corrosion, its application and its preparation method

A sulfate and raw material technology, applied in the field of anti-bacterial corrosion steel and its preparation, can solve problems that have not been seen yet, achieve good anti-SRB performance, eliminate segregated structures, and meet the requirements of harsh environments

Active Publication Date: 2021-12-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because sulfate-reducing bacteria are not easy to find in the flowing fluid, they adhere to the pipeline in groups or colonies
Therefore, once present, it is difficult to completely remove it by using fungicides
There are no reports on steels that can effectively resist SRB corrosion

Method used

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  • Steel resistant to sulfate-reducing bacteria corrosion, its application and its preparation method
  • Steel resistant to sulfate-reducing bacteria corrosion, its application and its preparation method
  • Steel resistant to sulfate-reducing bacteria corrosion, its application and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this embodiment, a steel resistant to sulfate-reducing bacteria corrosion has the following weight percentages of its main chemical components: C: 0.02%; Si: 0.1%; Mn: 0.3%; Cr: 20.5%; Cu: 0.15% ; Al: 3.1%; Ce: 0.1%; V: 0.15%; Nb: 0.05%; the rest is Fe and unavoidable impurities.

[0047] In this embodiment, the preparation method of steel resistant to sulfate-reducing bacteria corrosion in this embodiment includes the following steps:

[0048] a. Carry out raw material proportioning according to the weight percent of the main chemical composition of the steel material resistant to sulfate-reducing bacteria corrosion:

[0049] C: 0.02%; Si: 0.1%; Mn: 0.3%; Cr: 20.5%; Cu: 0.15%; Al: 3.1%; Ce: 0.1%; V: 0.15%; Nb: 0.05%; Avoid impurities; after mixing the raw materials of the above chemical components, smelting is carried out, and after smelting, alloy steel billets are made by continuous casting process, and then processed into alloy steel round billets by rolling;

...

Embodiment 2

[0053] This embodiment is basically the same as Embodiment 1, especially in that:

[0054] In this embodiment, a steel resistant to sulfate-reducing bacteria corrosion has the following weight percentages of its main chemical components: C: 0.01%; Si: 0.2%; Mn: 0.3%; Cr: 18.1%; Cu: 0.98% ; Al: 2.4%; Ce: 0.02%; Mo: 0.3%; V: 0.07%; the rest is Fe and unavoidable impurities.

[0055] In this embodiment, the preparation method of steel resistant to sulfate-reducing bacteria corrosion in this embodiment includes the following steps:

[0056] a. Carry out raw material proportioning according to the weight percent of the main chemical composition of the steel material resistant to sulfate-reducing bacteria corrosion:

[0057] C: 0.01%; Si: 0.2%; Mn: 0.3%; Cr: 18.1%; Cu: 0.98%; Al: 2.4%; Ce: 0.02%; Mo: 0.3%; V: 0.07%; Avoid impurities; after mixing the raw materials of the above chemical components, smelting is carried out, and after smelting, alloy steel billets are made by continu...

Embodiment 3

[0061] This embodiment is basically the same as the previous embodiment, and the special features are:

[0062] In this embodiment, a steel resistant to sulfate-reducing bacteria corrosion has the following weight percentages of its main chemical components: C: 0.04%; Si: 0.5%; Mn: 0.5%; Cr: 16%; Cu: 1.5% ; Al: 3.5%; Ce: 0.05%; Mo: 0.6%; Ti: 0.03%; the rest is Fe and unavoidable impurities.

[0063] In this embodiment, the preparation method of steel resistant to sulfate-reducing bacteria corrosion in this embodiment includes the following steps:

[0064] a. Carry out raw material proportioning according to the weight percent of the main chemical composition of the steel material resistant to sulfate-reducing bacteria corrosion:

[0065] C: 0.04%; Si: 0.5%; Mn: 0.5%; Cr: 16%; Cu: 1.5%; Al: 3.5%; Ce: 0.05%; Mo: 0.6%; Ti: 0.03%; Avoided impurities; after mixing the raw materials of the above chemical components, they are smelted, and after smelting, they are made into alloy st...

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Abstract

The invention discloses a steel for corrosion resistance to sulfate-reducing bacteria, its application and its preparation method. The weight percentages of the main chemical components of the steel are: C≤0.04%; Si: 0.1-0.5%; Mn≤0.5%; Cr: 16-24%; Cu: 0.15-1.5%; Al: 1.5-3.5%; Ce: 0.01-0.1%. The rest is Fe and unavoidable impurities. The manufacturing method of the sulfate-reducing bacteria corrosion-resistant steel of the present invention comprises: mixing raw materials, smelting, casting and forming into final product components; followed by high-temperature annealing heat treatment, the heating temperature is 1150-1250° C., and the holding time is 60-120 minutes. The steel produced by the invention can effectively resist the corrosion of SRB in the external environment, and the yield strength is greater than 380 MPa, meeting the requirements of J55 steel grade, and can well meet the problem of premature failure of oil production pipes for water injection wells due to SRB corrosion.

Description

technical field [0001] The invention relates to a stainless steel and a preparation method thereof, in particular to a bacterial corrosion-resistant steel and a preparation method thereof, which are applied in the technical field of steel for fossil energy exploration, mining and transportation pipelines and other process components resistant to sulfate-reducing bacteria corrosion . Background technique [0002] High pour point oil reservoirs are widely distributed in the world, with extremely rich geological reserves. my country's Liaohe, Jilin, Dagang, Henan and other oilfields all have high pour point oil reservoirs with considerable reserves, and their common characteristics are high wax content and high freezing point. Due to the special properties of high pour point oil reservoirs, normal temperature water injection development can effectively improve the ultimate recovery of reservoirs. Due to the long-term large-scale water injection, a low-temperature zone is form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/20C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/28C22C38/26C21D1/26
CPCC21D1/26C22C38/005C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28
Inventor 田青超任忠鸣
Owner SHANGHAI UNIV
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