Manufacturing method of corrosion-resistant steel tubes for natural gas conveying pipelines

A technology for transporting pipelines and natural gas, applied in the field of iron and steel materials, which can solve the problems of high production costs, low P and S content requirements, and high manufacturing costs, and achieve the effects of improving corrosion resistance, ensuring steel performance, and increasing strength

Inactive Publication Date: 2012-07-04
NANTONG BEICHENG SCI & TECH ENTREPRENEURIAL MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of C in CN1811002A is low, no micro-alloying treatment of V element is added, the requirements for the content of P and S are not high, and no new technology is provided to solve the negative effects caused by P and S
The high-toughness anti-hydrogen sulfide gas transmission pipeline steel disclosed by CN1351189 has very low P and S content requirements, high manufacturing cost, and is difficult to realize in the current industrialized production
CN01126611.2 discloses "a kind of low-carbon alloy steel and its produced pipe". The invention relates to a low-carbon low-alloy steel and its produced pipe. The technical problem to be solved is to increase the strength and toughness of the alloy steel and improve the hardenability And welding performance, impact performance is not very ideal, a variety of precious metals are added, the production cost is high, and the corrosion resistance performance is not considered. media requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing a corrosion-resistant steel pipe for natural gas transmission pipelines. The steel is composed of the following components in weight percentage: C: 0.10, Si: 0.8, Mn: 1.30, P: ≤0.008, S: ≤0.003, Cr: 1.5, Ni: 0.3, Nb: 0.45, B: 0.005, Cu: ≤0.15, Al: 0.050, N: 0.030, V: 0.10, and the rest are Fe and unavoidable impurities; the preparation method includes the following steps:

[0021] (1) Steel smelting: steel scrap, sponge iron and molten iron are melted into molten steel in a 150-ton ultra-high-power electric arc furnace, and then enter the refining furnace for out-of-furnace refining, sampling and analysis, and adjust the alloying elements in the steel according to the analysis results content; After degassing in a high vacuum degassing furnace, degassing, desulphurization, removal of inclusions, and wire feeding, pure molten steel is obtained, and the continuous casting machine is cast into a round billet.

[0022] (2) Tube forming: the steel bill...

Embodiment 2

[0026] A method for preparing a corrosion-resistant steel pipe for natural gas transmission pipelines. The steel is composed of the following components in weight percentage: C: 0.14, Si: 0.5, Mn: 1.50, P: ≤0.008, S: ≤0.003, Cr: 1.3, Ni: 0.7, Nb: 0.25, B: 0.01, Cu: ≤0.15, Al: 0.020, N: 0.10, V: 0.05, the rest are Fe and unavoidable impurities; the preparation method includes the following steps:

[0027] (1) Steel smelting: steel scrap, sponge iron and molten iron are melted into molten steel in a 150-ton ultra-high-power electric arc furnace, and then enter the refining furnace for out-of-furnace refining, sampling and analysis, and adjust the alloying elements in the steel according to the analysis results content; After degassing in a high vacuum degassing furnace, degassing, desulphurization, removal of inclusions, and wire feeding, pure molten steel is obtained, and the continuous casting machine is cast into a round billet.

[0028] (2) Tube forming: the steel billet is ...

Embodiment 3

[0032] A method for preparing a corrosion-resistant steel pipe for natural gas transmission pipelines. The steel is composed of the following components in weight percentage: C: 0.12, Si: 0.65, Mn: 1.45, P: ≤0.008, S: ≤0.003, Cr: 1.4, Ni: 0.5, Nb: 0.35, B: 0.008, Cu: ≤0.15, Al: 0.035, N: 0.07, V: 0.08, and the rest are Fe and unavoidable impurities; the preparation method includes the following steps:

[0033] (1) Steel smelting: steel scrap, sponge iron and molten iron are melted into molten steel in a 150-ton ultra-high-power electric arc furnace, and then enter the refining furnace for out-of-furnace refining, sampling and analysis, and adjust the alloying elements in the steel according to the analysis results content; After degassing in a high vacuum degassing furnace, degassing, desulphurization, removal of inclusions, and wire feeding, pure molten steel is obtained, and the continuous casting machine is cast into a round billet.

[0034] (2) Tube forming: the steel bill...

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Abstract

The invention discloses a manufacturing method of corrosion-resistant steel tubes for natural gas conveying pipelines. Steel is composed by the following components: by weight percentage, 0.10-0.14 of C, 0.5-0.8 of Si, 1.30-1.50 of Mn, <=0.008 of P, <=0.003 of S, 1.3-1.5 of Cr, 0.3-0.7 of Ni, 0.25-0.45 of Nb, 0.005-0.01 of B, <=0.15 of Cu, 0.020-0.050 if Al, 0.030-0.10 of N, 0.05-0.10 of V and the balance Fe and inevitable impurities. The manufacturing method includes the following steps: 1 steel smelting; 2 tube molding; 3 heat treatment and straightening; and 4 aftertreatment. Mechanical properties and corrosion resistance of the steel manufacture by the method fully meet requirements of the natural gas conveying pipelines.

Description

technical field [0001] The invention relates to the field of iron and steel materials, in particular to a method for preparing corrosion-resistant steel used for natural gas pipelines. Background technique [0002] Corrosion is a common phenomenon in the oil and gas industry, often causing significant economic losses to oil and gas fields and seriously polluting the environment. Common corrosion damage in sour oil and gas fields is usually divided into two types: one is uniform corrosion and local corrosion caused by the dissolution of anode iron during the electrochemical reaction process, which is manifested as local corrosion such as wall thickness reduction and pitting perforation of metal facilities that are increasing day by day The other type is the cathodic precipitation of hydrogen atoms during the electrochemical reaction process, and after entering the steel, it leads to two different types of cracking in metal components, namely, sulfide stress cracking (Sulfide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C33/04C21D8/10
Inventor 朱育盼
Owner NANTONG BEICHENG SCI & TECH ENTREPRENEURIAL MANAGEMENT
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