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Medium manganese steel continuous cast protecting slag used for offshore platform

A technology of continuous casting mold slag and offshore platform, which is applied in the field of iron and steel metallurgical continuous casting, which can solve the problems of billet lubrication and heat transfer condition fluctuations, influence on pouring process, and billet quality defects, etc., to achieve uniform heat transfer and lubrication conditions, The effect of good surface quality and small change in composition of slab

Inactive Publication Date: 2018-02-09
NORTHEASTERN UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of continuous casting of manganese steel, the Mn in the molten steel undergoes oxidation-reduction reaction with some oxides in the mold slag, which significantly increases the MnO content in the mold slag and the alkalinity of the mold slag, thus changing the fluidity of the mold slag. and crystallization performance, destroying the lubrication and heat transfer conditions between the slab and the mold, thereby affecting the smooth flow of the pouring process, causing serious quality defects of the slab, and even causing serious accidents such as breakout
[0004] At present, the development and design of mold flux for manganese steel continuous casting are mainly in two directions. One is to use low alkalinity and low viscosity CaO-SiO 2 Slag-based mold slag, such as Publication No. CN103008590A "A Continuous Casting Mold Mold for Medium-Carbon Manganese Steel", this type of mold slag reacts violently with molten steel due to its low alkalinity, so the composition of the mold slag varies widely. The performance is difficult to control, and it is easy to cause large fluctuations in the lubrication and heat transfer conditions of the slab, and the quality of the slab cannot be guaranteed; the other is to use CaO-Al with different fluxes 2 o 3 Slag-based mold flux, such as Publication No. CN104607608A "A New Medium Manganese Steel Mold Flux for Automobiles and Its Application", this type of mold flux is due to the amphoteric oxide Al in the slag 2 o 3 The content is very high, and it is necessary to add a variety of fluxes to adjust its performance to meet the requirements of continuous casting production. Therefore, the performance of the mold slag is unstable during the casting process, and problems such as high viscosity and insufficient lubrication often occur, and the mold slag seriously corrodes the nozzle. , unable to achieve long-term continuous casting
Therefore, the existing manganese steel mold powder still has many deficiencies, and it is difficult to meet the technical requirements of high-quality and high-efficiency production

Method used

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  • Medium manganese steel continuous cast protecting slag used for offshore platform
  • Medium manganese steel continuous cast protecting slag used for offshore platform
  • Medium manganese steel continuous cast protecting slag used for offshore platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A kind of medium manganese steel composition mass percent for offshore platform is: C 0.07%, Si 0.20%, Mn 5.8%, P0.008%, S 0.002%, N 0.004%, Al 0.30%, Cu 0.30%, Ni 0.30%, Cr 0.40%, Mo 0.40%, Ti 0.02%. The rest is Fe and unavoidable impurities. The section size of the billet is 2300mm×320mm, and the casting speed is 0.8m / min.

[0012] The mass percent of mold flux components described in this example is: CaO 37.8%, SiO 2 28.3%, Al 2 o 3 2.9%, MgO 1.3%, Na 2 O 7.3%, F 9.8%, MnO 2.1%, Fe 2 o 3 1.0%, TC 5.9%. The specific physical and chemical performance indicators are shown in Table 1. The casting process using the mold slag is stable and smooth, the surface quality of the slab is good, and no surface cracks and depressions are formed.

[0013] Table 1 The physical and chemical performance indicators of mold slag described in Example 1

[0014]

Embodiment 2

[0016] A kind of medium manganese steel composition mass percent for offshore platform is: C 0.05%, Si 0.15%, Mn 5.4%, P0.008%, S 0.002%, N 0.006%, Al 0.02%, Cu 0.15%, Ni 0.30%, Cr 0.40%, Mo 0.20%. The rest is Fe and unavoidable impurities. The section size of the slab is 1650mm×230mm, and the casting speed is 1.0m / min.

[0017] The mass percent of mold flux components described in this example is: CaO 35.2%, SiO 2 29.1%, Al 2 o 3 3.5%, MgO 1.0%, Na 2 O10.6%, F13.2%, MnO1.2%, Fe 2 o 3 0.8%, TC 4.8%. The specific physical and chemical performance indicators are shown in Table 2. The casting process using the mold slag is stable and smooth, the surface quality of the slab is good, and no surface cracks and depressions are formed.

[0018] Table 2 The physical and chemical performance indicators of mold slag described in Example 2

[0019]

Embodiment 3

[0021] A kind of medium manganese steel composition mass percent for offshore platform is: C 0.04%, Si 0.22%, Mn 4.9%, P0.007%, S 0.003%, N 0.004%, Al 0.03%, Cu 0.17%, Ni 0.35%, Cr 0.42%, Mo 0.30%. The rest is Fe and unavoidable impurities. The section size of the billet is 1880mm×300mm, and the casting speed is 0.9m / min.

[0022] The mass percent of mold flux components described in this example is: CaO 34.5%, SiO 2 27.3%, Al 2 o 3 4.5%, MgO 1.6%, Na 2 O 11.6%, F 8.8%, MnO 2.6%, Fe 2 o 3 1.1%, TC 6.2%. The specific physical and chemical performance indicators are shown in Table 3. The casting process using the mold slag is stable and smooth, the surface quality of the slab is good, and no surface cracks and depressions are formed.

[0023] Table 3 The physical and chemical performance indicators of mold slag described in Example 3

[0024]

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Abstract

The invention belongs to the technical field of iron and steel metallurgy continuous casting, and provides a medium manganese steel continuous cast protecting slag used for an offshore platform. The protecting slag comprises, by mass, 34.5-39.4% of CaO, 27.3-31.4% of SiO2, 2.6-4.5% of Al2O3, 0.7-1.6% of MgO, 7.2-11.6% of Na2O, 8.8-13.8% of F, 1.1-2.6% of MnO, 0.7-1.1% of Fe2O3 and 4.0-6.2% of TC.The protecting slag has good stability, and high-alkalinity protecting slag restrains the reaction of molten steel and the protecting slag to some extent, meanwhile improves the crystallization capacity of the protecting slag, and also compensates the reduced thickness of a slag layer and the crystallization temperature due to the increase of MnO content in the protecting slag; the low viscosity makes the protecting slag have good fluidity, on the one hand, the contact time of the steel slag is shortened, and on the other hand, the reasonable slag consumption and the uniformity of the slag layer are ensured; and the protecting slag is applied to medium manganese steel continuous casting in the offshore platform, heat transfer and lubrication conditions in a crystallizer are uniform, production is stable and smooth, and the billet surface quality is good.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical continuous casting, and in particular relates to a medium manganese steel continuous casting mold slag for offshore platforms. Background technique [0002] With the sustained and rapid economic development, the progress of industrialization puts forward further requirements on the performance and quality of steel products. Among them, manganese steel has shown great development potential in the marine industry due to its excellent mechanical properties and characteristics (such as high yield strength and tensile strength, excellent delayed fracture performance, low work hardening ability, and low production cost, etc.), Therefore, it has received more and more attention. [0003] There are still some technical difficulties in the production of medium manganese steel for offshore platforms using the high-efficiency "converter-refining-continuous casting" process route. The mo...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 杨杰蔡兆镇朱苗勇孔令种
Owner NORTHEASTERN UNIV
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