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Smelting method of high-strength IF steel

A smelting method and high-strength technology, applied in the field of low-cost and high-efficiency production of high-cleanliness and high-strength IF steel, can solve problems such as the inability to meet the cleanliness of molten steel and the matching of production rhythms at the same time, shorten the RH refining cycle, reduce OB oxygen blowing, and reduce The effect of smelting cost

Active Publication Date: 2014-11-19
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for smelting high-strength IF steel, which solves the problem that the traditional method for smelting high-strength IF steel cannot simultaneously satisfy the cleanliness of molten steel and the matching of production rhythm

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  • Smelting method of high-strength IF steel
  • Smelting method of high-strength IF steel
  • Smelting method of high-strength IF steel

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Embodiment Construction

[0023] In the following, the smelting method of the high-strength IF steel provided by the embodiment of the present invention will be further explained in combination with 6 furnaces of molten steel in a certain steelmaking plant.

[0024] In the smelting method of high-strength IF steel provided by the present invention, the target composition of the smelted steel is: [%C]<0.003, [%Mn]: 1.5-1.7, [%P]: 0.07-0.09, [%S]<0.015 , [%Nb]: 0.015~0.030, [%Ti]: 0.015~0.025, [%B]: 0.0005~0.0015, [%N]<0.004, this smelting method includes: adding desulfurized molten iron into dephosphorization and decarburization double Combined with the converter for smelting, the temperature and composition of the end point of the converter and the amount of slag alloy added during the tapping process are controlled. The amount of slag alloy added is shown in Table 3. The order of adding slag and alloy is small-grained lime, medium-carbon ferromanganese and slow-release deoxidizer. Small-grain lime an...

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Abstract

The invention discloses a smelting method of high-strength IF steel, which comprises the following steps of: adding the desulfurized molten iron into a dephosphorization converter and a decarbonization converter to perform duplex smelting, and then performing RH refining; controlling the blowing of the decarbonization converter until the concentration of O is 800-1,000ppm, the concentration of C is 0.025-0.04% and the destination temperature is 1,715-1,730 DEG C; directly tapping steel after the blowing of the decarbonization converter ends, wherein mid-carbon ferromanganese alloy and slag material for modifying slag are added in the steel tapping process at the same time, the slag material includes small-particle lime and controlled-release deoxidizing agent, and the RH refining is in a deep decarbonization mode; and after the decarbonization and vacuum breaking, adding the controlled-release deoxidizing agent to modify the slag respectively, wherein the controlled-release deoxidizing agent contains 40-50% of metal aluminum.

Description

technical field [0001] The invention relates to the technical field of high-strength IF steel smelting, in particular to a method for producing high-strength IF steel with high cleanliness and high efficiency at low cost, which can reduce the smelting cost of high-strength IF steel on the premise of ensuring the cleanliness of molten steel. Background technique [0002] The traditional high-strength IF steel smelting process usually adopts the converter-RH vacuum decarburization-slab continuous casting smelting process. Converter smelting does not deoxidize and boils steel, and RH performs decarburization treatment. The characteristic is that ferromanganese alloy is not added at the end of converter smelting, molten steel is not deoxidized, and top slag is not modified. [0003] However, if the ladle slag is not treated, the top slag of IF steel is highly oxidizable, which will easily lead to secondary oxidation of molten steel during the pouring process, resulting in alumi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/14C21C5/28C21C7/04
Inventor 李一丁李永林崔阳朱立新田志红赵长亮黄财德黄学启
Owner SHOUGANG CORPORATION
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