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Steel pipe, its preparation method and application

A manufacturing method and technology for steel pipes, applied in the field of steel pipe manufacturing, can solve the problems that steel pipes cannot meet the requirements of high strength, high toughness, SSC resistance and MIC resistance at the same time

Active Publication Date: 2022-03-11
HENGYANG VALIN STEEL TUBE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of this application is to provide a steel pipe, its preparation method and application, so as to solve the problem that the steel pipe prepared by the existing method cannot meet the characteristics of high strength, high toughness, SSC resistance and MIC resistance at the same time

Method used

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  • Steel pipe, its preparation method and application
  • Steel pipe, its preparation method and application
  • Steel pipe, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In terms of weight percentage, the chemical composition of oil well pipe is: C 0.12%, Si 0.22%, Mn 0.55%, Cu0.97%, Al0.35%, Ce 0.15%, Cr 1.02%, Mo 0.83%, Nb 0.002%, V 0.21%, Ti 0.001%, N 0.003%, S 0.001%, P 0.002%, O 0.002%, Ca 0.005%, and the balance is Fe; the sum of the weight percentages of elements Cu, Al and Ce is 1.47 %.

[0045] The manufacturing method of the oil well pipe of the present application is as follows:

[0046] (1) The raw materials are mixed according to the chemical composition described in this application, and the oil pipe steel is smelted through the smelting methods of electric furnace and out-of-furnace refining. The oxygen content (O) and the sulfur content (S) are both not greater than 0.005wt%, and then the Ce element is added, Stir evenly and cast to obtain a steel ingot with a diameter of 220mm;

[0047] (2) The steel ingot is electroslag remelted, cast into a steel ingot with a diameter of 220mm, and the chemical composition of the st...

Embodiment 2

[0056] The difference with embodiment 1 is:

[0057] In terms of weight percentage, the chemical composition of oil well pipe is: C 0.15%, Si 0.23%, Mn 0.56%, Cu0.98%, Al0.45%, Ce 0.15%, Cr 1.03%, Mo 0.85%, Nb 0.003%, V 0.005%, Ti0.002%, N 0.004%, S 0.001%, P 0.002%, O 0.003%, B 0.001%, and the balance is Fe; among them, the sum of the weight percentages of Cu, Al and Ce is 1.58%.

Embodiment 3

[0059] The difference with embodiment 1 is:

[0060] In terms of weight percentage, the chemical composition of the oil well pipe is: C 0.14%, Si 0.24%, Mn 0.59%, Cu1.19%, Al0.25%, Ce 0.15%, Cr 1.01%, Mo 0.82%, V 0.13%, N 0.004%, S 0.001%, P 0.002%, O 0.003%, B 0.001%, and the balance is Fe; wherein, the sum of the weight percentages of Cu, Al and Ce is 1.59%.

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Abstract

The application provides a steel pipe, its preparation method and application. It includes: dosing according to the following chemical composition to obtain raw materials: by weight percentage, the raw materials include C 0.08-0.30%, Si≤0.5%, Mn≤1.0%, Cu 0.5-2.0%, Al≤1.0%, Ce 0.01 ~0.2%, Cr 0.5~1.5%, Mo 0.5~1.5%, V≤0.3%, N≤0.005%, O≤0.005%, S≤0.005%, P≤0.005%, the balance is Fe; Melting, pouring, electroslag remelting, rolling and heat treatment to obtain steel pipes, when the contents of O and S in the reaction product system are not greater than 0.005wt%, Ce is added. The steel pipe prepared by the above method has the advantages of high strength, high toughness, resistance to sulfide stress corrosion and microbial corrosion, and realizes the integration of structure and function.

Description

technical field [0001] The present application relates to the field of steel pipe manufacturing, in particular, to a steel pipe, its preparation method and application. Background technique [0002] With the deepening of wells and the harshness of corrosive environments, oil and gas well pipes should have high strength and high corrosion resistance. Steel pipes exposed to H 2 In the acidic environment of S, hydrogen brittle fractures from sulfide stress corrosion cracking (SSC) will occur, and the higher the strength of the steel, the easier it is to cause SSC. In addition, in recent years, oil and gas pipeline breakage accidents caused by microbial corrosion (MIC) have occurred frequently, causing huge economic losses to the oil and gas industry. The pitting corrosion caused by MIC is also the crack source of SSC cracking, and the two corrosions promote each other, which brings great challenges to corrosion protection. Therefore, the oil and gas field industry is eager t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C21D1/18C21D6/00C21D8/10C21D9/08C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/005C22C38/20C22C38/22C22C38/24C22C38/001C22C38/002C22C33/04C22C38/26C22C38/28C22C38/32C21D1/18C21D6/002C21D6/005C21D6/008C21D8/105C21D9/08
Inventor 田研严伟邹喜洋史显波卓钊杨柯单以银郑秋燕
Owner HENGYANG VALIN STEEL TUBE
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