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A carbon dioxide corrosion resistant seamless steel pipe and its preparation method

A seamless steel pipe and carbon dioxide technology, applied in the field of pipeline steel manufacturing, can solve problems such as early corrosion failure, high cost, and shortened service life of pipelines, and achieve good corrosion resistance and economy, excellent carbon dioxide corrosion resistance, and low cost low effect

Active Publication Date: 2021-10-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbon dioxide corrosion may greatly shorten the actual service life of the pipeline, cause early corrosion failure, and cause serious corrosion damage such as pitting and perforation on the surface of the pipeline. Whether at home or abroad, carbon dioxide corrosion has become a problem that cannot be ignored
Conventional anti-corrosion technologies used in some oilfields, such as the use of high-alloy corrosion-resistant steel, continuous injection of corrosion inhibitors and other anti-corrosion technologies, are costly and complicated, and are difficult to promote and apply on a large scale

Method used

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  • A carbon dioxide corrosion resistant seamless steel pipe and its preparation method
  • A carbon dioxide corrosion resistant seamless steel pipe and its preparation method
  • A carbon dioxide corrosion resistant seamless steel pipe and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0037] Prepare the preparation method of above-mentioned carbon dioxide corrosion resistant seamless steel pipe, such as figure 1 As shown, the steps include:

[0038] Step 1, smelting and pouring steel ingots according to the composition of the above-mentioned seamless steel pipe;

[0039] Step 2. After smelting, the steel billet needs to be forged. The characteristics are: the heating temperature is not less than 1150°C, followed by forging, and the forging billet is annealed after forging. The temperature is 800-900°C, and the holding time is set at 3-5min / mm, cooling rate≤30℃ / h;

[0040] Step 3. Tube rolling process after forging, which is characterized in that: after forging, the round billet is annealed at 650-750°C, the annealing process is heat preservation in the furnace for 3-4 hours, and the annealed tube billet is heated at 1150-1200°C for 1.5-1.5 hours After 2 hours, use a conical piercer to perforate, and then pass through a sizing machine or a stretching and ...

Embodiment 1

[0069] The microstructure and morphology of the seamless steel pipe prepared in embodiment 1 and embodiment 2 are as follows: figure 2 and image 3 shown. As can be seen from the figure, in Example 1, the Cr content is close to the lower limit, and the Ni content is close to the upper limit. In Example 2, the Cr content is close to the upper limit, and the Ni content is close to the lower limit. near the endpoint. The structures of the two examples are both bainite + a small amount of ferrite, the structure is uniform, there is no obvious inclusion, and the comprehensive mechanical properties and corrosion resistance are good, which also shows that the present invention can achieve the expected effect within the composition range of the application.

[0070] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0071] Since Cr and C in steel are easy to form Cr carbides, adding Cr to carbon steel alone cannot achieve the expected co...

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Abstract

The invention provides a carbon dioxide corrosion-resistant seamless steel pipe and a preparation method thereof, and relates to the technical field of pipeline steel manufacturing. The prepared steel pipe has excellent carbon dioxide corrosion resistance, the corrosion rate is lower than 0.06mm / a, and the cost is low; The composition of the steel pipe includes C 0.03~0.08%, Cr 5.50~8.5%, Ni 0.1~2%, Nb 0.010~0.055%, P≤0.012%, S≤0.006%, N≤0.010%, the balance is Fe and not Avoided impurities; the method includes: S1, smelting according to the mass ratio of each component, and pouring into steel ingots; S2, forging and annealing for the first time; S3, annealing for the second time; S4, rolling pipes to obtain waste pipes; S5, heat treatment . The technical scheme provided by the invention is applicable to the process of preparing seamless steel pipes.

Description

【Technical field】 [0001] The invention relates to the technical field of pipeline steel manufacturing, in particular to a carbon dioxide corrosion-resistant seamless steel pipe and a preparation method thereof. 【Background technique】 [0002] In recent years, with the gradual increase in the demand for oil and gas energy, the development of deep oil and gas wells has been intensified. The traditional mining and transportation technology can no longer meet the demand, and the use of CO 2 Oil flooding can effectively enhance the recovery of low-permeability oilfields. Generally speaking, dry carbon dioxide is not corrosive, but it is extremely corrosive to steel in a humid environment or after being dissolved in water. After being dissolved in water, its total acidity is higher than that of hydrochloric acid at the same concentration, and its corrosion of steel is more serious than that of strong acid. Carbon dioxide corrosion may greatly shorten the actual service life of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/48B21C37/06C21D8/10
CPCB21C37/06C21D8/105C22C38/48
Inventor 武会宾顾洋张鹏程宋帅张志慧袁睿
Owner UNIV OF SCI & TECH BEIJING
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