Steel resistant to SRB (sulfate-reducing bacteria) corrosion as well as application and preparation method of steel

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, and achieve good SRB resistance, excellent mechanical properties, and the effect of eliminating segregated structures

Active Publication Date: 2017-11-28
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 SRB (sulfate-reducing bacteria) corrosion as well as application and preparation method of steel
  • Steel resistant to SRB (sulfate-reducing bacteria) corrosion as well as application and preparation method of steel
  • Steel resistant to SRB (sulfate-reducing bacteria) corrosion as well as application and preparation method of steel

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 steel resistant to SRB (sulfate-reducing bacteria) corrosion as well as an application and a preparation method of the steel. The steel is prepared from main chemical components in percentage by weight as follows: smaller than or equal to 0.04% of C, 0.1%-0.5% of Si, smaller than or equal to 0.5% of Mn, 16%-24% of Cr, 0.15%-1.5% of Cu, 1.5%-3.5% of Al, 0.01%-0.1% of Ce and the balance of Fe and inevitable impurities. The preparation method of the steel resistant to SRB corrosion comprises steps as follows: the raw materials are mixed and subjected to smelting and casting, and a final product component is formed; the final product component is subjected to high-temperature annealing heat treatment, the heating temperature is 1150-1250 DEG C, and the heat preservation time is 60-120 min. The prepared steel can effectively resist corrosion of SRB from the external environment, the yield strength is higher than 380 MPa, requirements of J55 steel grade are met, and the problem of premature failure of pipes for oil recovery in a water injection well due to SRB corrosion can be solved very well.

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 Applications(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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