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Large-wall-thickness X70-grade anti-acid pipeline steel and preparation method thereof

A pipeline steel, content technology, applied in the field of hot-rolled pipeline steel, can solve the problems of consumption and increase the cost of pipeline steel, and achieve the effects of simple process, fine grain size, and guaranteed low temperature toughness and mechanical properties

Active Publication Date: 2021-06-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of ultra-low Mn elements will lead to the consumption of other alloying elements Nb, Cr, Ti, etc., increasing the cost of pipeline steel

Method used

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  • Large-wall-thickness X70-grade anti-acid pipeline steel and preparation method thereof
  • Large-wall-thickness X70-grade anti-acid pipeline steel and preparation method thereof
  • Large-wall-thickness X70-grade anti-acid pipeline steel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] An X70-grade acid-resistant pipeline steel with a large wall thickness according to an embodiment of the present invention includes the following components in weight percent, C: 0.039wt%, Si: 0.26wt%, Mn: 1.10wt%, P0.0043wt%, S0.0025wt% %, Cr: 0.25wt%, Ti: 0.012wt%, Nb: 0.059wt%, V: 0.043wt%, Mg: 0.003wt%, others are Fe and unavoidable trace impurities.

[0032] See attached figure 1 Shown, preparation method shown in the present invention comprises:

[0033] (1) Hot metal pretreatment, respectively carry out desulfurization, dephosphorization and desiliconization treatment to hot metal, so that the S content in the hot metal is 0.05%, the Si content is reduced to not higher than 0.2wt%, and the P content is reduced to not higher than 0.01wt% %;

[0034] (2) Converter smelting. Converter smelting adopts top blowing and bottom stirring at the same time, adopts slag blocking operation to prevent phosphorus return when tapping, and controls carbon content to be no more ...

Embodiment 2

[0046] A large wall thickness X70 grade acid-resistant pipeline steel in this embodiment, including C: 0.045wt%, Si: 0.28wt%, Mn: 1.11wt%, P0.0045wt%, S0.0026wt%, Cr: 0.26wt% , Ti:0.016wt%, Nb:0.066wt%, V:0.042wt%, Mg:0.003wt%, others are Fe and unavoidable trace impurities.

[0047] See attached figure 1 Shown, preparation method shown in the present invention comprises:

[0048] (1) Hot metal pretreatment, respectively carry out desulfurization, dephosphorization and desiliconization treatment to hot metal, make the S content w in the hot metal be 0.05%, the Si content is reduced to not higher than 0.2wt%, the P content is reduced to not higher than 0.01 wt%;

[0049] (2) Converter smelting. Converter smelting adopts top blowing and bottom stirring at the same time, and adopts slag blocking operation to prevent phosphorus back when tapping, and controls the carbon content to 0.027wt%, and the P content to 0.0038wt%;

[0050] (3) Refining in LF furnace, using silicon-calci...

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Abstract

The invention discloses large-wall-thickness X70-grade anti-acid pipeline steel and a preparation method thereof. The preparation method comprises the steps that desulfurization, dephosphorization and desiliconization treatment is performed on molten iron respectively; top blowing and bottom stirring are performed at the same time in converter smelting, and rephosphorization is prevented by adopting slag stopping operations during tapping; LF furnace refining is performed, specifically, silicon-calcium alloy powder is sprayed to the bottom of molten steel with argon as carrier gas; RH furnace refining is performed; and plate blank pouring is performed. By means of the large-wall-thickness X70-grade anti-acid pipeline steel and the preparation method thereof, the material cost is greatly reduced on the premise of ensuring the material HIC resistance.

Description

technical field [0001] The invention relates to the technical field of hot-rolled pipeline steel, in particular to a X70 grade acid-resistant pipeline steel with large wall thickness and a preparation method thereof. Background technique [0002] Due to my country's vast territory and uneven distribution of resources, in response to the new requirements of the country for energy conservation and emission reduction, oil and gas transportation is developing towards the trend of crude oil, high pressure and high speed. As the main carrier of oil and gas transportation, pipeline steel is bound to have higher requirements on the strength, corrosion resistance and hydrogen-induced cracking resistance of pipeline steel. Therefore, it is of great significance to develop high-grade acid-resistant pipeline steel to improve the efficiency of oil transportation and ensure the service life and safety of oil and gas pipelines. [0003] The technical difficulty of thick-gauge high-strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/26C22C38/28C21C7/10C21C1/02C21C1/04C21D8/02C21C7/06
CPCC22C38/02C22C38/04C22C38/28C22C38/26C22C38/24C22C38/002C21C7/10C21C1/02C21C1/04C21D8/0226C21C7/06Y02P10/20
Inventor 刘静彭志贤黄峰胡骞戴明杰
Owner WUHAN UNIV OF SCI & TECH
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