Method for directly loading casting blank of thick plate containing microalloy elements

A technology of microalloying and billet, which is applied in the field of metallurgical technology, can solve the problems of not providing thick plates containing microalloying elements, different phase transition temperatures, and affecting the direct loading and hot delivery process of different steel types, so as to reduce oxidation and burning. The effect of low loss, simple operation, and improving the pass rate of cold bending performance

Inactive Publication Date: 2013-10-09
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different characteristics of steel grades, the phase transition temperature of different steel grades is also different, which will inevitably affect the direct loading and hot delivery process of different steel grades. This quality defect is unique to the hot delivery and hot charging process. However, existing literature and reports And the patent does not provide a solution to the problems encountered in the direct assembly process of thick plates containing microalloying elements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The smelting process route is: BOF—LF—RH. The content of Mn and S in the steel is controlled during the smelting process, and 41.6kg of rare earth is added to the molten steel, while the oxygen content in the molten steel is controlled. The molten steel composition sample was taken from the tundish for testing, and the molten steel composition wt% was: C 0.15%, Si 0.35%, Mn 1.37%, P 0.018%, S 0.0088%, Ti 0.0145%, O 0.0021%, Re 0.016%. The slab exits the casting machine for on-line forced cooling. The temperature of the slab exiting the straightening section is 900°C. After entering the forced cooling section, the slab cooling rate is 10°C / min, and the cooling time is 10min. Then the cast slab is air-cooled, and then enters the heating furnace after being cut once along the conveying roller, cut to length twice, and the surface temperature of the cast slab before entering the heating furnace is 620°C. There is no crack on the surface of the steel plate after rolling, an...

Embodiment 2

[0020] The smelting process route is: BOF—LF—RH. The content of Mn and S in the steel is controlled during the smelting process, and the molten steel composition samples are taken from the tundish for testing. The molten steel composition wt% is: C 0.16%, Si 0.28%, Mn 1.30%, P 0.02%, S 0.0067%, Ti 0.013%. The slab exits the casting machine for online forced cooling, the temperature of the slab leaving the straightening section is 910°C, and after entering the forced cooling section, the cooling rate of the slab is controlled at 15°C / min, and the cooling time is 10min. Then the cast slab is air-cooled and is cut along the conveying roller once, cut to length twice, and then enters the heating furnace. The surface temperature of the cast slab before entering the heating furnace is 540°C. There is no crack on the surface of the steel plate after rolling, and the cold bending performance is qualified.

Embodiment 3

[0022] The smelting process route is: BOF—LF—RH. During the smelting process, the content of Mn and S in the steel is controlled, and 47kg of rare earth is added to the molten steel, while the oxygen content in the molten steel is controlled. The molten steel composition sample was taken from the tundish for testing, and the molten steel composition wt% was: C 0.12%, Si 0.18%, Mn 1.35%, P 0.017%, S 0.0077%, Ti 0.010%, O 0.0024%, Re 0.018%. The slab exits the casting machine for online forced cooling, and the temperature of the slab exiting the straightening section is 920°C. After entering the forced cooling section, the cooling rate of the slab is controlled at 15°C / min, and the cooling time is 15min. Then the cast slab is air-cooled and is cut along the conveying roller once, cut to length twice, and then enters the heating furnace. The surface temperature of the cast slab before entering the heating furnace is 640°C. There is no crack on the surface of the steel plate afte...

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PUM

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Abstract

The invention provides a method for directly loading a casting blank of a thick plate containing microalloy elements. The method comprises the steps that the content of Mn and S in steel is controlled, the casting blank gets out of a casting machine to be strongly cooled in an on-line mode, the temperature when the casting blank gets out of a straightening section is controlled, the cooling rate and the cooling time when the casting blank gets out of a strongly-cooling section are controlled, then air cooling is conducted on the casting blank, the casting blank is cut for the first time and the second time along a conveying roller and then enters a heating furnace after the size is fixed, and the surface temperature before the casting blank enters the heating furnace is controlled. The measures that rare earth is added in liquid steel in the smelting process and the oxygen content in the liquid steel is controlled at the same time can be adopted. According to the method, existing devices and processes are fully utilized, investment does not need to be increased, operation is easy, the problems of cold bending and cracking of directly-loaded rolled metal containing the microalloy elements can be solved, qualified rate of the cold bending performance of steel plates is improved, combustion consumption of the heating furnace is reduced, oxidation burning loss of the casting blank is reduced, the capacity of the heating furnace is improved, surface cracks do not exist on the steel plates which are rolled, and all performance indexes meet the standard requirement.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for direct loading of thick slabs containing microalloy elements. Background technique [0002] Billet direct loading is a technology that has many economic benefits such as reducing fuel consumption of heating furnace, reducing oxidation and burning loss of billet and increasing production. The so-called slab direct loading refers to the operation in which the slab cut by continuous casting is directly transported to the heating furnace through the roller table, and loaded into the heating furnace at a relatively high temperature. In the process of direct loading of thick plates containing microalloying elements, the temperature of the billet before entering the heating furnace is controlled at Ar 1 ~ Ar 3 In between, there is a problem of cold bending of the rolled plate, mainly due to the existence of cold bending cracks, and the cracks spread lateral...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
Inventor 康伟于赋志李超方恩俊尚德礼张宁吕志升苏小利
Owner ANGANG STEEL CO LTD
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