Manufacturing method of corrosion-resistance alloy hot-rolled steel pipe

A technology of corrosion-resistant alloys and manufacturing methods, applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as poor corrosion resistance, lack of galvanizing equipment, and peeling off of the anti-corrosion layer, so as to avoid electrochemical corrosion and maintenance work The effect of ensuring corrosion resistance in a small amount

Inactive Publication Date: 2017-04-05
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned sulfuric acid dew point corrosion-resistant steels only have the ability to prevent acid liquid corrosion, and are not effective for other types of corrosion in crude oil. Oilfield corrosion has the following characteristics: gas, water, hydrocarbons, and solid coexistence multiphase flow corrosion The medium includes both general corrosion and local corrosion, including carbon dioxide gas and acid solution corrosion, hydrogen sulfide corrosion, stress corrosion cracking and microbial corrosion, etc. In order to further improve the comprehensive corrosion resistance of the inner wall of the oil pipeline, it is generally used Pickling, but pickling cannot effectively prevent various corrosions on the inner wall of the pipeline, the corrosion resistance is poor, and the pickling time is not easy to control, resulting in uneven pickling thickness of the inner wall of the pipeline. Another technique is to paint the inner wall with anti-corrosion layer, but the anti-corrosion layer is not easy to paint evenly, and under the impact of the flow of crude oil, the anti-corrosion layer is easy to fall off from the inner wall of the oil pipeline. Another technology is to use galvanized pipe as the oil transportation pipeline, but for larger diameter , for long pipes, there is no galvanizing equipment of corresponding size, and galvanizing is expensive

Method used

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  • Manufacturing method of corrosion-resistance alloy hot-rolled steel pipe
  • Manufacturing method of corrosion-resistance alloy hot-rolled steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The composition of the steel pipe by weight percentage is: C 0.05%, Mo 0.1%, Mn: 1.1%, P≦0.02%, S≦0.002%, N≦0.005%, O≦0.001%, Ni 0.08%, Cu 1.0%, Sb 0.04%, V 0.1%, Zr 0.2%, Als 0.01%, Nb 0.02%, Ti 0.08%, W 0.05%, light rare earth LREE 0.01%, and satisfy 1.0%≤Cu+Zr+Als+Ti≤ 1.4%, the balance is Fe and unavoidable impurities;

[0035] The cooling step is to place the corrected steel pipe in a vacuum cooling furnace with a pressure of 10KPa and cool it to 850°C, then spray water on the surface of the steel pipe to cool it down to 650°C, and finally air-cool it. In the heating step, the steel pipe blank is heated to 1090°C, and then the piercing step is performed, the temperature of the steel pipe blank in the continuous rolling step is 1055°C, and the temperature of the steel pipe blank in the tension sizing step is 955°C.

Embodiment 2

[0037] The composition of the steel pipe by weight percentage is: C 0.07%, Mo 0.1%, Mn: 1.1%, P≦0.02%, S≦0.002%, N≦0.005%, O≦0.001%, Ni 0.1%, Cu 0.8%, Sb 0.07%, V 0.12%, Zr 0.15%, Als 0.01%, Nb 0.05%, Ti 0.05%, W 0.1%, light rare earth LREE 0.01%, and satisfy 1.0%≤Cu+Zr+Als+Ti≤ 1.4%, the balance is Fe and unavoidable impurities;

[0038] The cooling step is to place the corrected steel pipe in a vacuum cooling furnace with a pressure of 15KPa and cool it to 870°C, then spray water on the surface of the steel pipe to cool it down to 630°C, and finally air-cool it. In the heating step, the steel pipe blank is heated to 1090°C, and then the piercing step is performed, the temperature of the steel pipe blank in the continuous rolling step is 1055°C, and the temperature of the steel pipe blank in the tension sizing step is 940°C.

Embodiment 3

[0040] The composition of the steel pipe by weight percentage is: C 0.05%, Mo 0.15%, Mn: 0.7%, P≦0.02%, S≦0.002%, N≦0.005%, O≦0.001%, Ni 0.12%, Cu 1.0%, Sb 0.1%, V 0.15%, Zr 0.2%, Als 0.02%, Nb 0.07%, Ti 0.05%, W 0.2%, light rare earth LREE 0.02%, and satisfy 1.0%≤Cu+Zr+Als+Ti≤ 1.4%, the balance is Fe and unavoidable impurities;

[0041] The cooling step is to place the corrected steel pipe in a vacuum cooling furnace with a pressure of 30KPa and cool it to 900°C, then spray water on the surface of the steel pipe to cool it down to 600°C, and finally air-cool it. In the heating step, the steel pipe blank is heated to 1080°C, and then the piercing step is performed, the temperature of the steel pipe blank in the continuous rolling step is 1035°C, and the temperature of the steel pipe blank in the tension sizing step is 935°C.

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Abstract

The invention aims to provide a manufacturing method of a corrosion-resistance alloy hot-rolled steel pipe with high acid resistance and excellent comprehensive corrosion resistance. The manufacturing method of the steel pipe comprises the steps of: iron smelting by a blast furnace, predesulfurization of molten steel, converter top-bottom compound blowing, LF furnace refining, continuous casting of a steel pipe blank, heating, perforation, continuous rolling, tension diameter determination, correction, cooling and prewashing; the prewashing is performed for the inner wall of the steel pipe by a corrosion inhibitor; after the corrosion inhibitor is contacted with the inner wall of the steel pipe, a layer of uniform protective film is formed on the inner wall of the steel pipe, so that the corrosion resistance of the inner wall of the steel pipe is improved; sodium gluconate preferably realizes absorption of such metal ions as aluminum and copper in the steel pipe to form ion complex compounds to prevent electrochemical corrosion; the corrosion inhibitor has multiple slow release mechanisms to preferably realize the corrosion resisting effect; and when the pipe conveys crude oil, the corrosion inhibitor has no need to continuously feed, so that the maintenance workload is low.

Description

technical field [0001] The invention relates to the field of oil pipeline manufacturing, in particular to a method for manufacturing a corrosion-resistant alloy hot-rolled steel pipe. Background technique [0002] Corrosion is one of the problems that plague the development of the oil and gas industry. According to a rough estimate, the loss caused by corrosion to my country's oil industry accounts for about 6% of the total output value of the industry, and taking appropriate anti-corrosion measures can at least recover 30%-40% of the loss . At present, the common installation method of oil pipelines for transportation in my country is buried underground, and some oil pipelines are placed in the open environment, which further improves the corrosion resistance requirements of oil pipelines, and must meet the anti-corrosion requirements of the inner wall of the pipeline , but also meet the requirements of atmospheric corrosion resistance. [0003] Acid gas corrosion is the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/12C22C38/04C22C38/08C22C38/16C22C38/14C22C38/06C21D8/10C21D9/08C23F11/173C23F11/16C23F11/14C23F11/12
CPCC21D8/105C21D9/08C22C38/005C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/60C23F11/12C23F11/141C23F11/16C23F11/173
Inventor 徐士祺郝上京王勇
Owner XI'AN PETROLEUM UNIVERSITY
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