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Method for reducing edge serration defects in thin slabs

A technology of serrated edges and thin slabs, applied in metal rolling and other directions, can solve problems such as productivity decline and steel damage, and achieve the effects of improving quality, increasing yield, improving reliability and productivity

Inactive Publication Date: 2011-07-27
HYUNDAE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In particular, steels containing niobium (Nb) and 0.20 wt% to 0.28 wt% carbon produced in a continuous thin slab casting process may have many jagged defects
In this case, the steel is susceptible to damage even at stresses below the strength of the raw material
[0008] This leads to a decrease in productivity as steel producers need to do additional processing of this hot rolled coil with edge jagged defects

Method used

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  • Method for reducing edge serration defects in thin slabs
  • Method for reducing edge serration defects in thin slabs
  • Method for reducing edge serration defects in thin slabs

Examples

Experimental program
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Effect test

Embodiment

[0047] casting a thin slab containing niobium (Nb) and 0.20% to 0.28% by weight of carbon; then reheating in a heat treatment furnace so that the temperature of the thin slab output from the heat treatment furnace is 1040°C to 1090°C; Hot rolling is performed to prepare hot rolled coils.

[0048] From image 3 It can be seen that niobium carbide (NbC) begins to precipitate at a temperature of 1060 ° C to 1080 ° C; when the temperature of the thin slab output from the heat treatment furnace is equal to or higher than the precipitation temperature of niobium carbide (NbC), the edge jagged The defect index decreased rapidly.

[0049] In addition, when the temperature of the thin slab output from the heat treatment furnace is lower than 1060° C., niobium carbide (NbC) is precipitated rapidly, thus causing an increase in the edge serration index of the hot-rolled coil.

[0050] From Figure 4 It can be seen that although the microstructure of the thin slab varies with the temper...

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Abstract

In the present invention, a thin slab having an alloy composition comprising carbon (C), niobium (Nb) and aluminium (Al) and a remainder of iron (Fe) and unavoidable impurities is reheated in a heat-treatment furnace where it is homogenised to an austenitic structure, and the production of precipitates is controlled by maintaining the heat-treatment-furnace extraction temperature of the thin slab at no lower than the NbC precipitation temperature and no higher than the AlN precipitation temperature, and then hot rolling is carried out. The present invention is advantageous in that it improves productivity since edge serration defects in thin slabs are reduced by controlling the heat-treatment-furnace extraction temperature of thin slabs.

Description

technical field [0001] The present invention relates to a method for reducing edge jagged defects in thin slabs, and more particularly, the present invention relates to a method for reducing edge jagged defects which are typical defects of thin slabs. Background technique [0002] Among the various slab casting methods, the thin slab casting process is used to produce thin slabs with dimensions close to those of the final product. In the thin slab casting process, since the rough rolling step can be omitted, the process can be simplified. [0003] In this continuous thin slab casting process, thin slabs can be produced at high speeds compared to typical continuous casting processes. The molten steel in the liquid state solidifies completely in the mold and mold holder into a thin slab with finer grains than normally produced slabs. [0004] However, since the slab is thin, it cools rapidly, especially the edges of the thin slab cool faster than the middle part, thus formin...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/00B21B1/40
CPCC22C38/00C21D6/02C22C38/06B21B1/40C22C38/12C21D2211/004C21D8/0263C21D8/0215
Inventor 柳奭铉文洪佶张进洙
Owner HYUNDAE STEEL CO LTD
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