Novel medium manganese steel casting powder for automobile and application thereof

A technology of mold slag and medium manganese steel, which is applied in the field of continuous casting of iron and steel, can solve problems such as unstable heat flow and poor quality of billet, and achieve the effects of inhibiting interface reaction, strengthening control, and better controlling heat transfer capacity

Active Publication Date: 2015-05-13
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the design of these mold fluxes has not fully considered that the reaction of slag steel will lead to mold flux crystallization, the influence of viscosity and other physical and chemical properties, and the resulting problems such as unstable heat flow and poor quality of casting slabs, so these mold fluxes are not suitable for use. Production of Medium Manganese Steel by Slab Continuous Casting Machine
Especially unsuitable for slab continuous casting machine to produce medium-manganese steel for automobiles containing active metal elements such as aluminum and titanium

Method used

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  • Novel medium manganese steel casting powder for automobile and application thereof

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Effect test

Embodiment 1

[0037] A medium and high manganese steel continuous casting mold mold powder for automobiles, its composition mass percentage is: CaO 32.1%, Al 2 o 3 21.3%, SiO 2 11.8%, MgO 3.8%, Na 2 O 12.7%, Li 2 O 1.4%, MnO 4.8%, F - 12.1%. The mold flux CaO / Al 2 o 3 is 1.5. The main physical properties of the mold flux measured by the above method are shown in Table 1. The mold powder designed in this embodiment is used in the continuous casting process of medium-manganese steel for automobile steel with a mass percentage content of 0.5% C, 6.5% Mn and 3.5% Al; the equiaxed crystal ratio of the obtained slab is 88%, and the Longitudinal cracks and inclusions occur less than 0.55% of the time.

Embodiment 2

[0039] A medium and high manganese steel continuous casting mold mold powder for automobiles, its composition mass percentage is: CaO 35.8%, Al 2 o 3 18.1%, SiO 2 11.5%, MgO 4.8%, Na 2 O 11.5%, Li 2 O 1.5%, MnO 5.0%, F - 11.8%. The mold flux CaO / Al 2 o 3 is 2.0. The main physical properties of the mold flux measured by the above method are shown in Table 1. The mold powder designed in this embodiment is used in the continuous casting process of medium-manganese steel for automobile steel with a mass percentage content of 0.6% C, 7.3% Mn, and 5.5% Al; the equiaxed crystal ratio of the obtained slab is 90%, and the slab The probability of occurrence of longitudinal cracks and inclusions is less than 0.34%.

Embodiment 3

[0041] A medium and high manganese steel continuous casting mold mold powder for automobiles, its composition mass percentage is: CaO 32.7%, Al 2 o 3 16.8%, SiO 2 13.5%, MgO 5.0%, Na 2 O 13.1%, Li 2 O 1.9%, MnO 5.5%, F - 11.5%. The mold flux CaO / Al 2 o 3 is 1.9. The main physical properties of the mold flux measured by the above method are shown in Table 1. The mold flux designed in this embodiment is used in the continuous casting process of medium-manganese steel for automobile steel with a mass percentage content of C 1.0%, Mn 10.0%, and Al 2.5%; the equiaxed crystal ratio of the obtained slab is 91%, and the slab The probability of occurrence of longitudinal cracks and inclusions is less than 0.28%.

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Abstract

The invention relates to a novel medium manganese steel casting powder for an automobile and application of the novel medium manganese steel casting powder and belongs to the technical field of continuous casting of iron and steel. The casting powder comprises, by mass, CaO 29%-37%, Al2O3 16%-25%, SiO2 11%-15%, MgO 2%-7%, Na2O 10%-14%, Li2O 1%-5%, MnO 1%-7% and F- 9%-13%. The melting point of the casting powder is 1,100-1,200 DEG C; at 1,300 DEG C, the viscosity of the casting powder is 0.10-0.30 Pa*s, and the crystallizing rate is 40%-70%; the heat flow is 1.1-1.6 MW / m<2> in the continuous casting process. The designed casting powder can be well used in the medium manganese steel continuous casting process for the automobile with the mass percentage of Mn being 3.0%-15.0%.

Description

technical field [0001] The invention relates to a novel medium manganese steel mold slag for automobiles and its application, belonging to the technical field of iron and steel continuous casting. Background technique [0002] With the development of my country's automobile industry, the demand for ultra-high-strength steel is getting higher and higher, and the requirements for its formability are also getting higher and higher. Manganese can improve the strength and plasticity of steel, so manganese steel has gradually become the development direction of automobile steel. For example, the second-generation automotive steel TWIP steel not only has high strength and formability, but also has a good ability to absorb impact energy; High strength and high elongation, and moderate cost, has excellent application prospects. [0003] At present, medium manganese steel for automobile steel has been produced by steelmaking-continuous casting-steel rolling technology route, especia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 王万林周乐君赵欢马范军黄道远
Owner CENT SOUTH UNIV
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