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Steel, preparation method and application thereof

A manufacturing method and steel technology, applied in the field of alloy steel manufacturing, can solve the problems of resistance to sulfide stress corrosion, resistance to microbial corrosion, and inability to meet high strength at the same time

Active Publication Date: 2020-11-20
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 the present invention is to provide a kind of steel, preparation method and application thereof, to solve the problem that existing steel cannot simultaneously meet high strength, high toughness, resistance to sulfide stress corrosion (SSC) and resistance to microbial corrosion (MIC)

Method used

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  • Steel, preparation method and application thereof

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Effect test

Embodiment 1

[0046] In terms of weight percentage, the chemical composition of steel is: C 0.091%, Si 0.24%, Mn 0.51%, Cu0.92%, Al 0.32%, Ce 0.12%, Cr 1.0%, Mo 0.82%, Nb 0.004%, V 0.20 %, Ti 0.001%, N 0.003%, S 0.001%, P 0.002%, O 0.002%, Ca 0.005%, and the balance is Fe. Wherein, the sum of the content of Cu element, Al element and Ce element is 1.36%.

Embodiment 2

[0048] In terms of weight percentage, the chemical composition of steel is: C 0.14%, Si 0.21%, Mn 0.50%, Cu 0.93%, Al 0.42%, Ce 0.15%, Cr 1.0%, Mo 0.85%, Nb 0.003%, V 0.005% , Ti 0.002%, N0.005%, S 0.001%, P 0.002%, O 0.004%, B 0.001%, and the balance is Fe. Wherein, the sum of the contents of Cu element, Al element and Ce element is 1.50%.

Embodiment 3

[0050] In terms of weight percentage, the chemical composition of steel is: C 0.097%, Si 0.22%, Mn 0.59%, Cu1.17%, Al 0.22%, Ce 0.13%, Cr 1.02%, Mo 0.80%, V 0.10%, 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 content of Cu element, Al element and Ce element is 1.52%.

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Abstract

The invention provides steel, a preparation method and application thereof. The preparation method comprises the following steps: batching according to the following chemical compositions to obtain araw material, wherein the raw material comprises the following chemical compositions in percentage by weight: 0.08-0.30% of C, equal to or less than 0.5% of Si, equal to or less than 1.0% of Mn, 0.5-2.0% of Cu, equal to or less than 1.0% of Al, 0.01-0.2% of Ce, 0.5-1.5% of Cr, 0.5-1.5% of Mo, equal to or less than 0.3% of V, equal to or less than 0.005% of N, equal to or less than 0.005% of O, equal to or less than 0.005% of S, equal to or less than 0.005% of P and the balance of Fe; sequentially carrying out smelting, pouring and aftertreatment on the raw material to obtain steel; and when the content of each of O and S in a reaction product system is equal to or less than 0.005wt%, adding the element Ce in the reaction product system. The prepared steel has the advantages of being high in strength and toughness and resisting sulfide stress corrosion and microbiological corrosion and realizes integration of structure and function.

Description

technical field [0001] The invention relates to the field of alloy steel manufacturing, in particular to a steel material, a preparation method and an application thereof. Background technique [0002] Pipeline corrosion is a serious problem in the process of oil and gas exploration, gathering and transportation. Hydrogen sulfide (H 2 S) caused by sulfide stress corrosion (SSC) and microbial corrosion (MIC) are two important forms of pipeline corrosion. MIC is mainly based on localized corrosion (pitting corrosion). The occurrence and development of corrosion are unpredictable, and there are no rules to follow in the corrosion site. In recent years, frequent pipeline leakage accidents caused by MIC have caused huge economic losses to the oil and gas industry. At the same time, the pitting corrosion caused by MIC is also the crack source of SSC cracking, and the two promote each other, which brings great challenges to corrosion protection. In addition to corrosion resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C21D8/00C21D1/18
CPCC22C38/02C22C38/04C22C38/20C22C38/06C22C38/005C22C38/22C22C38/24C22C38/001C21D1/18C21D8/005C21D2211/008
Inventor 邹喜洋史显波田研严伟周正平杨柯李端正单以银曾天翼
Owner HENGYANG VALIN STEEL TUBE
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