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Production process for controlling large inclusions in acid-resistant pipeline steel

A production process and pipeline steel technology, applied in the field of metallurgy, can solve problems such as increasingly stringent service environment requirements, affecting the performance of steel plates, unqualified flaw detection and inclusion inspection, etc., to improve internal quality, good deformation ability, and improve purity Effect

Active Publication Date: 2017-08-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the increasing demand for energy in the world economy, the dependence on pipeline transportation of oil and natural gas is increasing, and the service environment requirements of pipeline transportation pipelines are becoming more and more stringent. For the transportation of acidic oil and natural gas, the base material must have acid and corrosion resistance. , in order to meet the acid resistance, extremely low carbon and extremely low sulfur should be used in the composition design. Desulfurization leads to the production of a large number of aluminum-based inclusions in the steel, which leads to the failure of flaw detection and inclusion inspection, and seriously affects the performance of the steel plate.

Method used

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  • Production process for controlling large inclusions in acid-resistant pipeline steel
  • Production process for controlling large inclusions in acid-resistant pipeline steel
  • Production process for controlling large inclusions in acid-resistant pipeline steel

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Embodiment 1

[0020] This embodiment is a production process for controlling large inclusions in acid-resistant pipeline steel, including the following steps:

[0021] (1) The weight percentage composition of pipeline steel is: C: 0.040%, Si 0.30%, Mn: 1.30%, P: 0.013%, S: 0.0010%, Nb: 0.070%, Ti: 0.020%, Ca: 0.0040%, Al: 0.050%, Cu: 0.30%, Ni: 0.30%, Cr: 0.30%, the balance is Fe;

[0022] (2) The desulfurization station uses lime and magnesium powder for composite desulfurization, and the slag is clean after desulfurization to ensure that the sulfur behind the converter is less than 100ppm;

[0023] (3) After the molten steel reaches RH, the vacuum degree is less than or equal to 3mbar for decarburization, and after the carbon is less than 0.01%, it is alloyed. After the alloying is completed, the vacuum is maintained. No alloying operation is performed during the vacuum treatment;

[0024] (Iv) LF uses lime and aluminum deoxidizer for desulfurization operation, desulfurization to 5-8ppm, to ensur...

Embodiment 2

[0033] This embodiment is a production process for controlling large inclusions in acid-resistant pipeline steel, including the following steps:

[0034] (1) The weight percentage composition of pipeline steel is: C: 0.020%, Si 0.10%, Mn: 1.0%, P: 0.01%, S: 0.0010%, Nb: 0.030%, Ti: 0.006%, Ca: 0.0040%, Al: 0.015%, Cu: 0.10%, Ni: 0.10%, Cr: 0.10%, the balance is Fe;

[0035] (2) The desulfurization station uses lime and magnesium powder for composite desulfurization, and the slag is clean after desulfurization to ensure that the sulfur behind the converter is less than 100ppm;

[0036] (3) After the molten steel reaches RH, the vacuum degree is less than or equal to 3mbar for decarburization. After the carbon is less than 0.01%, the alloying treatment is carried out. After the alloying is completed, the vacuum is maintained. No alloying operation is carried out during the vacuum treatment;

[0037] (Iv) LF uses lime and aluminum deoxidizer for desulfurization operation, desulfurization...

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Abstract

The invention discloses a production process for controlling large inclusions in acid-resistant pipeline steel. Through systematic analysis on a pipeline steel inclusion control mechanism adopting a BOF-RH-LF production process, the component design is reasonably performed; the pipeline steel comprises the following components in percentage by weight: 0.02-0.04 percent of C, 0.10-0.30 percent of Si, 1.00-1.30 percent of Mn, less than or equal to 0.013 percent of P, less than or equal to 0.0010 percent of S, 0.030-0.070 percent of Nb, 0.006-0.020 percent of Ti, 0.10-0.30 percent of Ni, 0.10-0.30 percent of Cr, 0.10-0.30 percent of Cu, 0.015-0.050 percent of Al and the balance of Fe. The production process disclosed by the invention has the benefits that the content of sulfurs in molten steel before calcium treatment is ensured to be less than 10 ppm; the quantitative calcium treatment is performed after the end of LF; the purpose of improving the purity of the molten steel is achieved, so that the internal quality of steels is improved, and the economic benefits are improved.

Description

Technical field [0001] The invention belongs to the field of metallurgy and relates to a production process for controlling large inclusions in acid-resistant pipeline steel. Background technique [0002] With the continuous increase of energy demand in the world economy, the dependence on pipeline transportation of oil and natural gas is increasing, and the service environment of pipeline transportation pipelines is becoming more and more demanding. For the transportation of sour oil and gas, the base material needs to have acid and corrosion resistance. , In order to meet the acid resistance, the composition design needs to adopt extremely low carbon and extremely low sulfur. Desulfurization leads to a large number of aluminum inclusions in the steel, which leads to unqualified flaw detection and inclusion inspection, and seriously affects the performance of the steel plate. . [0003] Acid corrosion-resistant pipeline steel is mainly used to make pipelines for transporting sour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/48C22C38/50C22C38/42C22C38/06C21C7/064C21C7/10C21C7/06C21C7/00
CPCC21C7/0006C21C7/0037C21C7/0056C21C7/06C21C7/064C21C7/10C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50Y02P10/20
Inventor 翟冬雨徐建飞姜金星黄福强
Owner NANJING IRON & STEEL CO LTD
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