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Production method capable of controlling performance difference in thickness direction of super-thick plate

A technology of thickness direction and production method, which is applied in the field of metallurgy, can solve problems such as the performance difference of ultra-thick steel plates, and achieve the effects of strong stress state, improved impact toughness, and prolonged normalizing holding time

Inactive Publication Date: 2017-12-22
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a production method for controlling the performance difference of ultra-thick plates in the thickness direction. Through innovative smelting technology, steel ingot solidification control technology, steel ingot rolling technology, heat treatment technology and other technological methods, the current situation can be effectively solved. There is a problem of performance difference in the thickness direction of the ultra-thick steel plate, which ensures that the chemical composition and mechanical properties of the ultra-thick steel plate in different positions in the thickness direction show micro-gradient changes, stabilizes the performance of the steel plate, and reaches the leading level in the same industry. Capable of mass production

Method used

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  • Production method capable of controlling performance difference in thickness direction of super-thick plate

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Embodiment 1

[0019] The production method for controlling the performance difference in the thickness direction of the P295GH steel plate with a thickness of 150 mm includes smelting, die casting, rolling, and heat treatment processes. The specific process steps are as follows:

[0020] (1) Smelting process: The molten steel tapped from the converter enters LF refining, adding 1kg / t steel desulfurizer synthetic slag, the basicity is controlled at 4.0, the P content is 0.004%, and the S content is 0.001%; ​​then VD vacuum treatment is carried out , the vacuum degree is 67Pa, the vacuum treatment time is 45min, after breaking the vacuum, add 1.5kg / t steel Mg-containing Ca-Si core wire, N: 55ppm, O: 10ppm, H: 1.5ppm;

[0021] Synthetic slag is mainly CaO-Al 2 o 3 Alkaline slag system, the composition is: CaO: 50%, Al 2 o 3 : 45%, SiO 2 : 5%; Ca-Si core wire containing Mg, the composition is: Ca: 30%, Si: 50%, Mg: 5%, CaC 2 : 15%;

[0022] (2) Die-casting process: during die-casting, the...

Embodiment 2

[0027] The production method for controlling the performance difference in the thickness direction of the S355NL steel plate with a thickness of 250 mm includes smelting, die casting, rolling, and heat treatment processes. The specific process steps are as follows:

[0028] (1) Smelting process: The molten steel tapped from the converter enters LF refining, adding 1.5kg / t steel desulfurizer synthetic slag, the basicity is controlled at 5.0, the P content is 0.005%, and the S content is 0.001%; ​​then VD vacuum Treatment, the vacuum degree is 62Pa, the vacuum treatment time is 50min, after breaking the vacuum, add 1.8kg / t steel Mg-containing Ca-Si core wire, N: 40ppm, O: 8ppm, H: 0.5ppm;

[0029] Synthetic slag is mainly CaO-Al 2 o 3 Alkaline slag system, the composition is: CaO: 55%, Al 2 o 3 : 40%, SiO 2 : 4%, FeO: 1%; Ca-Si core wire containing Mg, the composition is: Ca: 35%, Si: 55%, CaC 2 : 10%;

[0030] (2) Die-casting process: during die-casting, the superheat of ...

Embodiment 3

[0035] The production method for controlling the performance difference in the thickness direction of the S355J2+N steel plate with a thickness of 300 mm includes smelting, die casting, rolling, and heat treatment processes. The specific process steps are as follows:

[0036] (1) Smelting process: The molten steel tapped from the converter enters LF refining, adding 1.4kg / t steel desulfurizer synthetic slag, the basicity is controlled at 5.0, the P content is 0.004%, and the S content is 0.001%; ​​then VD vacuum Treatment, the vacuum degree is 60Pa, the vacuum treatment time is 40min, after breaking the vacuum, add 2.5kg / t steel Mg-containing Ca-Si core wire, N: 60ppm, O: 10ppm, H: 1.0ppm;

[0037] Synthetic slag is mainly CaO-Al 2 o 3 Alkaline slag system, the composition is: CaO: 54.5%, Al 2 o3 : 44.5%, FeO: 1%; Ca-Si core wire containing Mg, the composition is: Ca: 30%, Si: 50%, CaC 2 : 20%;

[0038] (2) Die-casting process: during die-casting, the superheat of molten s...

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Abstract

The invention discloses a production method capable of controlling performance difference in a thickness direction of a super-thick plate. The method comprises the processes of smelting, die casting, rolling and thermal treatment; the smelting process comprises LF refining, wherein P content of molten steel is smaller than or equal to 0.005%, and S content of the molten steel is smaller than or equal to 0.001%; the rolling process adopts a thermal mechanical rolling method; and the thermal treatment process adopts a normalizing treatment process. Through creative technological methods of a smelting technology, a steel ingot condensation control technology, a steel ingot rolling technology, a thermal treatment technology and the like, the performance difference problem in the thickness direction of the existing super-thick plate is effectively solved, chemical components and mechanical properties on different positions in the thickness direction of the super-thick plate are guaranteed to have microinverse changes, performances at each part of a steel plate are stabilized, and strength, plasticity and toughness in the thickness direction of the super-thick plate achieve optimal matching.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method for controlling the performance difference of an ultra-thick plate in the thickness direction. Background technique [0002] Extra-thick steel plates are the key materials required by the high-end equipment manufacturing industry. Especially with the large-scale and high-end equipment, the demand for high-quality special steel plates at home and abroad is increasing day by day, and the important manifestation of high-quality extra-thick steel plates is the performance difference at different positions of the steel plate thickness. Small. However, the overall production technology level of ultra-thick steel plates in my country is still relatively low. Only a few enterprises such as Wugang can produce large-weight and extra-thick steel plates. Among them, steel plates over 150 mm still need to be imported in large quantities. Key processes such a...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/10C21D1/28C21D8/02
CPCC21C7/0645C21C7/0056C21C7/10C21D1/28C21D8/0226
Inventor 邓建军王晓书高雅张朋谷盟森张鹏云耿宽宽
Owner WUYANG IRON & STEEL
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