Pipeline steel with resistance against carbon dioxide and hydrogen sulfide corrosion and preparation method thereof

A carbon dioxide and production method technology, applied in the field of pipeline steel, can solve the problems of short development life, poor economy, limited application, etc., and achieve the effect of improving local corrosion resistance and average corrosion resistance

Active Publication Date: 2013-10-02
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most oilfields in my country are lean ore and low-permeability oilfields, and the development life is mostly about 10 years, and the development life is relatively short. It is not economical to use expensive high-chromium stainless steel or nickel-based alloys. Pipeline steel with a certain resistance to carbon dioxide and hydrogen sulfide corrosion has become the best choice
[0004] After searching, it is found that the patents on carbon dioxide and hydrogen sulfide corrosion-resistant steel are basically used to manufacture oil well pipes and casings, etc. Due to the conditions of use of pipeline steel and the manufacturing The method is quite different from the oil casing, especially the carbon dioxide and hydrogen sulfide partial pressure, temperature, flow rate, etc. in the delivery pipe are very different from the downhole oil casing, and there are also differences in the processing and forming process of oil casing and pipeline steel. There is a big difference, such as the patent No. CN 1487112A, which also has a certain resistance to carbon dioxide and hydrogen sulfide corrosion through alloy design, but it requires quenching and tempering of steel pipes, which limits its use in pipeline steel. Applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A pipeline steel resistant to carbon dioxide and hydrogen sulfide corrosion, comprising the following components: C: 0.064%, Si: 0.20%, Mn: 0.40%, Cr: 2.43%, V+Cu+Ni=0.41%, Al+Nb+Ti =0.057%, P:0.006%, S≤0.0042%, the balance is Fe and unavoidable impurities.

[0018] This example is manufactured by the TMCP rolling process.

[0019] Smelting, forging, forging and pressing the aforementioned steel types into steel billets, rolling process, the steel billet is heated at 1150°C, and after soaking for 3 hours, rough rolling is carried out in the recrystallization temperature region; in the rough rolling step, the rough rolling is The rolling temperature is 1100°C, the final rolling temperature is 950°C, and the cumulative rolling reduction rate is 55%; %; In the cooling process: the final cooling temperature is controlled at 400°C, and the cooling rate is 8°C / s. After the above steps of controlled rolling and controlled cooling, the steel in the rolling state is obtained, a...

Embodiment 2

[0021] A pipeline steel resistant to carbon dioxide and hydrogen sulfide corrosion, including the following components (wt%), C: 0.043%, Si: 0.22%, Mn: 0.35%, Cr: 2.98%, V+ Cu+ Ni = 0.63%, Al + Nb + Ti = 0.066%, P: 0.005%, S≤0.0045%, the balance is Fe and unavoidable impurities.

[0022] This example is manufactured by the TMCP rolling process.

[0023]Smelting, forging, forging and pressing the aforementioned steel types into steel billets, and rolling process. The rolling process adopts TMCP rolling process. The steel billet is heated at 1250°C, and after soaking for 1 hour, roughing is carried out in the recrystallization temperature region. Rolling; in the rough rolling step, the starting rolling temperature of rough rolling is 1200°C, the finishing rolling temperature is 1050°C, and the rolling cumulative reduction rate is 65%; in the finishing rolling process: the starting rolling temperature is 1000°C, The final rolling temperature is 900°C, and the cumulative r...

Embodiment 3

[0025] A pipeline steel resistant to carbon dioxide and hydrogen sulfide corrosion, including the following components (wt%), C: 0.035%, Si: 0.23%, Mn: 0.23%, Cr: 5.01%, V+ Cu+ Ni = 0.57%, Al + Nb + Ti = 0.085%, P: 0.006%, S≤0.0040%, the balance is Fe and unavoidable impurities.

[0026] This example is manufactured by the TMCP rolling process.

[0027] Smelting, forging, forging and pressing the aforementioned steel types into steel billets, rolling process, the rolling process adopts TMCP rolling process, the steel billet is heated at 1200°C, and after soaking for 2 hours, roughing is carried out in the recrystallization temperature region. rolling; in the rough rolling step, the starting rolling temperature of the rough rolling is 1150°C, the finish rolling temperature is 1000°C, and the rolling cumulative reduction rate is 65%; in the finishing rolling process: the starting rolling temperature is 950°C, The final rolling temperature is 850°C, and the cumulative rolling re...

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Abstract

The invention relates to a pipeline steel, especially to a pipeline steel with resistance against carbon dioxide and hydrogen sulfide corrosion, and also relates to a preparation method thereof, and belongs to the field of pipeline steel manufacturing technology. The pipeline steel with resistance against carbon dioxide and hydrogen sulfide corrosion comprises following chemical compositions in mass percent, C 0.02 to 0.08%, Si 0.10 to 0.50%, Mn 0.10 to 0.50%, V 0.01 to 0.20%, Al 0.01 to 0.05%, Cu 0.10 to 0.50%, Cr 2.0 to 6.0%, Ni 0.3% or less, Nb 0.3% or less, Ti 0.3% or less, P 0.02% or less, and S 0.005% or less, with the balance being Fe or impurity elements which are unavoidable. The pipeline steel is resistant against both carbon dioxide and hydrogen sulfide corrosion, and can be used in an environment with both of the two corrosive gases, and the resistance against carbon dioxide and hydrogen sulfide corrosion of the pipeline steel is 2 times or more of that of currently used carbon steel.

Description

technical field [0001] The invention relates to a pipeline steel, in particular to a pipeline steel resistant to carbon dioxide and hydrogen sulfide corrosion, and also relates to a production method thereof, which belongs to the technical field of pipeline steel manufacture. Background technique [0002] With the in-depth development of my country's western development, the development of oil and natural gas is intensified, and the gathering and transportation pipeline steel used in petrochemical industry is facing a strong corrosion environment (such as high temperature and high pressure, high carbon dioxide content, hydrogen sulfide and chloride ions coexist ), resulting in many accidents such as well pipeline breakage and gas gathering trunk leakage in the petroleum industry, causing huge losses to the country and the petroleum industry. [0003] Among them, the corrosion of carbon dioxide and hydrogen sulfide is a long-standing major problem in the extraction and transpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/24C22C38/50C22C33/04C21D8/00
Inventor 尹雨群赵晋斌苑阳阳李多红
Owner NANJING IRON & STEEL CO LTD
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