Preparation method of ultra-low carbon steel and ultra-low carbon steel plate

A technology of ultra-low carbon steel and molten steel, applied in the direction of improving process efficiency, etc., can solve the problems of streak-like defects of cold-rolled galvanized sheet, easy occurrence of network cracks and transverse cracks in cast slab, and low crack occurrence rate, etc. Achieve the effect of eliminating surface micro-crack defects, eliminating strip defects and improving quality

Inactive Publication Date: 2011-01-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the ultra-low carbon steel cast slab produced by the existing method is prone to network cracks and transverse cracks, which makes the crack occurrence rate of the cast slab relatively high, and will cause cold-rolled galvanized strips In order to solve the problem of scar-like defects, a preparation method for ultra-low carbon steel and ultra-low carbon steel plates with a low incidence of slab cracks is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] According to the present invention, the preparation method of the ultra-low carbon steel comprises:

[0017] (1) The molten steel obtained by smelting is subjected to extra-furnace refining, and the method of said extra-furnace refining includes carrying out pre-deoxidation alloying and desulfurization of the molten steel, so that the active oxygen content in the molten steel is 0.04-0.06% by weight, and the S content is 0.06- 0.015% by weight; and the molten steel is subjected to temperature adjustment treatment, decarburization and alloy fine-tuning, so that the total weight of the molten steel is used as a benchmark, and the contents of each substance in the molten steel are respectively 0.003-0.005% by weight for C content and 0.002-0.03% by weight for Si content %, the content of Mn is 0.10-0.25% by weight, the content of P is 0.006-0.015% by weight, the content of S is 0.006-0.015% by weight, the content of Ti is 0.050-0.085% by weight, the content of Als is 0.02-0...

Embodiment 1

[0051] This example is used to illustrate the preparation of ultra-low carbon steel and ultra-low carbon steel plate provided by the present invention.

[0052] In this embodiment, the method of the present invention is used to control the streak-like defects of the IF3 brand ultra-deep drawn cold-rolled steel sheet. The chemical composition of the IF3 brand ultra-deep drawn steel is shown in Table 1 (unit: weight %).

[0053] After IF3 steel is smelted in the converter, alkalinity (CaO / SiO 2 (weight ratio) is 84 refining slag mixed with molten steel, and the addition is 5.0 kg / ton of molten steel, while adding medium carbon ferromanganese (the Mn content is 80% by weight, the Fe content is 18.5% by weight, and the C content is 1.4% by weight, S content is 0.01% by weight) 2.3 kg / ton of molten steel carries out pre-deoxidation, so that the total weight of molten steel is used as a benchmark, so that the active oxygen content in molten steel is 0.045% by weight, and the S conte...

Embodiment 2

[0058] This example is used to illustrate the preparation of ultra-low carbon steel and ultra-low carbon steel plate provided by the present invention.

[0059] In this embodiment, the method of the present invention is used to control the streak-like defects of the IF4 brand ultra-deep drawn cold-rolled steel sheet. The chemical composition of the IF4 brand ultra-deep drawn steel is shown in Table 2 (unit: weight %).

[0060] After IF4 steel is smelted in the converter, alkalinity (CaO / SiO 2 ) 95 high alkalinity refining slag mixed with molten steel, the addition is 6.0 kg / ton of molten steel, while adding medium carbon ferromanganese (Mn content is 80% by weight, Fe content is 18.5% by weight, C content is 1.4% by weight, S content is 0.01% by weight) 2.2 kg / ton of molten steel is carried out pre-deoxidation, make the total weight of molten steel as a benchmark, make oxygen activity in molten steel be 0.038% by weight, S content be 0.008% by weight; Tapping is completed Fin...

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Abstract

The invention provides a preparation method of ultra-low carbon steel, comprising the following steps: carrying out pre-deoxidation and alloying, desulfuration, thermoregulation, decarburization and alloy fine adjustment on molten steel; before thermoregulation of the molten steel, adding a slag-adjusting agent containing A1 which accounts for 8-12% of the total weight of the slag-adjusting agent to the surface of ladle slag so that the content of (FeO+MnO) in the ladle slag is not more than 20wt% of the total weight of the ladle slag; after decarburization and alloy fine adjustment, circulating the molten steel under a vacuum condition so that the content of T[O] in the steel is 0.0025-0.004wt% of the total weight of the steel; continuously injecting the obtained molten steel into a crystallizer, and adding casting powder; and continuously drawing out the molten steel with a hard shell from the outlet of the crystallizer to obtain a continuous casting billet. In the method, the viscosity of the casting powder at 1300 DEG C is 0.2-0.3Pa.S, alkalinity is 0.8-1.1, and melting point is 1040-1130 DEG C; the broad-face heat flux density and the narrow-face heat flux density of the cooling crystallizer are 1350-1416kw / sq.m. and 1122-1174kw / sq.m. respectively, and the heat flux ratio of the broad face to the narrow face of the crystallizer is 0.8-0.85; and continuous casting speed is 0.8-1.3m / min.

Description

technical field [0001] The invention relates to a preparation method of ultra-low carbon steel and a preparation method of ultra-low carbon steel plate. Background technique [0002] Ultra-low carbon deep-drawing steel is mainly used for the production of cold-rolled galvanized sheets with strict surface quality requirements such as automobile sheets and home appliance sheets. Because the thickness of this type of sheet is relatively thin, generally 0.8-1.6mm, the rolling compression ratio reaches more than 120 Therefore, if the inclusion content in the slab is high or the inclusion size is large, after rolling with a large reduction ratio, the surface of the cold-rolled sheet will have inclusion streak defects, which will affect the product quality. In addition, ultra-low carbon deep-drawing steel generally contains a certain amount of microalloying elements, such as Al, V, Ti, etc. During the continuous casting production process, due to the solid solution of Al, V, and Ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21C7/06C21C7/064B22D11/111B22D11/20
CPCY02P10/20
Inventor 吴国荣陈永曾建华周海龙杨金成
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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