Niobium-titanium microalloyed acid medium corrosion-resistant steel plate with yield strength of 600MPa and production method thereof

A technology of microalloying and yield strength, which is applied in the field of steel materials and its manufacturing, can solve the problems of low strength and high manufacturing cost of acid-resistant steel, and achieve excellent strength and toughness matching, good atmospheric corrosion resistance, and good acid medium corrosion resistance Effect

Inactive Publication Date: 2021-01-05
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned patent adopts wide and thick plate rolling mill for single-sheet rolling, and the strength of acid-resistant steel is low, and precious metal element Mo is added, so the manufacturing cost is relatively high

Method used

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  • Niobium-titanium microalloyed acid medium corrosion-resistant steel plate with yield strength of 600MPa and production method thereof
  • Niobium-titanium microalloyed acid medium corrosion-resistant steel plate with yield strength of 600MPa and production method thereof
  • Niobium-titanium microalloyed acid medium corrosion-resistant steel plate with yield strength of 600MPa and production method thereof

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Embodiment Construction

[0025] The technical solutions of the present invention will be further described below through specific examples.

[0026] According to the chemical composition requirements provided by the present invention, molten iron pretreatment→converter steelmaking→LF refining→continuous casting process is adopted for smelting. Take wherein 3 furnace steels as 3 embodiments of the present invention. After refining outside the LF furnace, the chemical composition in the steel meets the weight percentage (wt%): C: 0.06-0.10%; Si: 0.20%-0.40%; Mn: 1.30-1.70%; P: ≤0.015%; S: ≤ 0.005%; Cr: 0.70-1.00%; Ni: 0.10-0.20%; Cu: 0.25-0.30%; Nb: 0.045-0.060%; Ti: 0.025-0.045%; Sb: 0.08-0.10%; %; the balance is Fe and unavoidable inclusions.

[0027] The chemical composition of each embodiment of the present invention is as shown in table 1, and weather resistance index I>6.0, I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P )-7.29(%Cu)×(%Ni)-9.10(%Ni)×(%P)-33.39(%Cu) 2 . Composition detectio...

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Abstract

The invention discloses a niobium-titanium microalloyed acid medium corrosion-resistant steel plate with the yield strength of 600 MPa and a production method thereof. The steel plate comprises the following chemical components of, in percentage by weight, 0.06% to 0.10% of C, 0.20% to 0.40% of Si, 1.30% to 1.70% of Mn, P less than or equal to 0.015%, S less than or equal to 0.005%, 0.70% to 1.00%of Cr, 0.10% to 0.20% of Ni, 0.25% to 0.30% of Cu, 0.045% to 0.060% of Nb, 0.025% to 0.045% of Ti, 0.08% to 0.10% of Sb, 0.020% to 0.040% of Als and the balance Fe and inevitable impurities, the weather resistance index I of the steel plate is greater than 6.0; and the steel plate is obtained by adopting the technological processes of molten iron pretreatment deep desulfurization, converter smelting, LF furnace refining, continuous casting, plate blank heating, rough rolling, finish rolling, laminar cooling and coiling. According to the niobium-titanium microalloyed acid medium corrosion-resistant steel plate with the yield strength of 600 MPa, the yield strength reaches 600 MPa, the cost is low, and the steel plate has good acid medium resistance and atmospheric corrosion resistance andmeanwhile has excellent strength and toughness matching and cold bending forming performance.

Description

technical field [0001] The invention belongs to the field of iron and steel materials and their manufacture, and in particular relates to a niobium-titanium microalloyed steel plate with a yield strength of 600 MPa and acid medium corrosion resistance and a production method thereof. Background technique [0002] In metallurgy, electric power, petrochemical and other industrial fields, heavy oil or coal usually contains 2% to 3% sulfur, which produces SO after combustion 2 , SO 3 , and then combine with the moisture contained in the combustion gas or the moisture contained in the air to generate highly corrosive sulfuric acid. Acid corrosion generally occurs in boiler preheaters, coal burner equipment, and transmission pipelines, flues, chimneys, etc., causing great harm to industrial production equipment and tools. [0003] Due to the poor corrosion resistance of ordinary carbon steel in acidic media and its short service life, corrosion problems in the use of steel have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/48C22C38/50C22C38/60C22C38/06C22C38/58C21D8/02
CPCC21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58C22C38/60
Inventor 胡学文郭锐张建朱涛何博王海波汪飞石践舒宏富郑晴
Owner MAANSHAN IRON & STEEL CO LTD
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