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Method for improving high temperature plasticity of steel

A technology of high-temperature plasticity and high-strength steel, which is applied in the field of steelmaking and continuous casting, can solve the problems that the pro-eutectoid ferrite structure cannot be suppressed at the same time, and the segregation behavior cannot be effectively eliminated, so as to achieve the effect of improving high-temperature plasticity

Active Publication Date: 2018-04-06
SUZHOU UNIV
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AI Technical Summary

Problems solved by technology

The existing technology cannot simultaneously suppress the precipitation of pro-eutectoid ferrite structure and the precipitation of the second phase particles at the grain boundary, and cannot effectively eliminate its segregation behavior at the grain boundary

Method used

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  • Method for improving high temperature plasticity of steel

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Embodiment 1

[0045] A domestic steel plant uses a 240t converter to smelt steel micro-alloy steel. The composition of the steel is 0.09%C-0.25%Si-1.53%Mn-0.035%Nb-0.021%Ti. Because the aluminum deoxidized steel contains 0.35%Al element . The steel production route is BOF→LF→Mg treatment→CC. After the alloying of converter tapping is completed, it is sent to the LF station for desulfurization and refining treatment, adding alloy elements to obtain micro-alloyed molten steel, and the wire feeding operation is carried out in the later stage of refining. The aluminum-magnesium-iron composite cored wire contains 10% magnesium and 35% aluminum , the rest is iron, with a diameter of 15mm, wrapped by 0.5mm iron sheet, the wire feeding speed is 3.0m / s, the feeding amount is 350 m / furnace, and then the argon gas blowing volume is 45L / min. The magnesium content in it is kept at 20ppm. Send it to the continuous casting platform for pouring, the tundish capacity is 45t, the stable liquid level height...

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Abstract

The invention belongs to the field of steel-making continuous casting production of micro-alloy high-strength steel, and discloses a method for improving the high temperature plasticity of steel basedon a synergistic effect of magnesium treatment and two-times cooling. By the synergistic effect of a magnesium treatment process and a novel two-times cooling control process, components, the size and the distribution state of second-phase particles in a micro-alloy high-strength steel casting blank can be effectively controlled, the thickness of a proeutectoid ferrite film distributed along an original austenite grain boundary is controlled, the percentage reduction of area of the casting blank is increased significantly through detection with Gleeble3800 and is higher than 50%. Thus the effects that method can significantly improve the high temperature plasticity of the micro-alloy high-strength steel and the surface crack defects of the casting blank can be overcome effectively are verified.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, and in particular relates to a method for improving high-temperature plasticity of steel, which is suitable for suppressing transverse crack defects on the surface of casting slabs in the production process of microalloy high-strength steel for steelmaking and continuous casting. Background technique [0002] Corner transverse cracks are the most prominent quality problem in the continuous casting and hot rolling process of high-strength micro-alloyed steel (HSLA), and it is also a technical problem that domestic iron and steel enterprises have not completely solved for many years. With the increase of the hot charging ratio of continuous casting slabs, the corner cracks of high-strength steel slabs containing Nb-Ti microalloys have become the main defects that limit the continuous casting and rolling production. The cause of this defect is extremely complex, and it is ...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/10B22D11/22
CPCB22D11/22B22D11/225C21C7/0006C21C7/0056C21C7/10
Inventor 屈天鹏王德永田俊王慧华苏丽娟徐周陈开来
Owner SUZHOU UNIV
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