A low-cost magnesium-treated microalloyed steel and its preparation method

A low-cost technology for microalloyed steel, applied in the field of low-cost magnesium-treated microalloyed steel and its preparation, can solve the problems of unfavorable microstructure and properties of low-carbon microalloyed steel, difficult inclusion control, etc., and achieve significant economic benefits, fine Crystallization, adding a stable effect

Active Publication Date: 2021-08-27
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, micro-magnesium treatment technology has attracted widespread attention. At present, there are three main achievements related to magnesium treatment technology at home and abroad: the purification effect of magnesium treatment on molten steel, and the effect of magnesium treatment on the properties of steel for high-energy-input welding. The improvement effect of magnesium treatment on the equiaxed grain ratio of steel solidification structure; however, the application of magnesium treatment in low-carbon micro-alloyed steel has not been seen, mainly because the inclusions precipitated by magnesium are difficult to control, and the low-carbon micro-alloyed steel However, due to the obvious advantages in the cost of magnesium treatment, it is necessary to develop new methods, tap the potential of magnesium treatment technology, and realize the large-scale industrial application of magnesium treatment in low-carbon microalloyed steel

Method used

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  • A low-cost magnesium-treated microalloyed steel and its preparation method
  • A low-cost magnesium-treated microalloyed steel and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027]The steel grade is HR60 wheel steel. The 250t converter smelting process is adopted, and Si-Mn weak deoxidation is used after the furnace, and the oxygen content in the steel is controlled at 0.01wt%; then LF slagging is used to raise the temperature, and Al is used for deep deoxidation, and then the alloying design is carried out, and the Nb content in the steel is adjusted during alloying. Reduce from 0.03wt% of the benchmark steel to 0.02wt%, Ti content from 0.02wt% to 0.01wt%, vacuum degassing in RH after alloying, break the vacuum after the treatment, and feed Mg-Al into the ladle - Fe cored wire (where the magnesium content is 10wt%, the Al content is 60wt%, and the Fe content is 30wt%), the wire feeding speed is 3m / s, and the feeding amount is 250m; The conventional continuous casting process casts a slab continuous casting slab with a thickness of 230mm. The continuous casting slab is heated in a high-temperature furnace at a heating temperature of 1220°C, and th...

Embodiment 2

[0030] The production steel grade is X65 pipeline steel. The 250t converter smelting process is adopted, and Si-Mn weak deoxidation is used after the furnace, and the oxygen content in the steel is controlled at 0.015wt%. LF slagging and heating, using Al deep deoxidation, and then alloying design; during alloying, the Nb content in the steel is reduced from 0.045wt% of the benchmark steel to 0.030wt%, and the V content is reduced from 0.045wt% to 0.030wt%. Vacuum degassing in RH after alloying, break the vacuum after treatment, and feed Mg-Al-Fe cored wire into the ladle (the content of magnesium is 15wt%, the content of Al is 55wt%, and the content of Fe is 30wt%) , the feeding line speed is 3m / s, and the feeding amount is 300m. Soft blow for 8 minutes after wire feeding, and then use conventional continuous casting technology to cast slab continuous casting slab with a thickness of 230mm. The continuous casting slab is heated in a high-temperature furnace at a heating tem...

Embodiment 3

[0032] The production steel grade is QSTE500. The 250t converter smelting process is adopted, and Si-Mn weak deoxidation is used after the furnace, and the oxygen content in the steel is controlled at 0.012wt%. LF makes slag and heats up, uses Al deep deoxidation, and then carries out alloying design. During alloying, the Nb content in the steel was reduced from 0.06wt% to 0.04wt%, and the Ti content was reduced from 0.04wt% to 0.025wt%. Vacuum degassing in RH after alloying, break the vacuum after treatment, and feed Mg-Al-Fe cored wire into the ladle (the content of magnesium is 15wt%, the content of Al is 60wt%, and the content of Fe is 25wt%) , the feeding line speed is 3m / s, and the feeding amount is 280m. Soft blow for 8 minutes after wire feeding, and then use conventional continuous casting technology to cast slab continuous casting slab with a thickness of 230mm. The continuous casting slab is heated in a high-temperature furnace at a heating temperature of 1220°C ...

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Abstract

The invention discloses a low-cost magnesium-treated micro-alloy steel and a preparation method thereof, including steel smelting, alloying, cored wire feeding, continuous casting, rolling and the like. After RH refining is finished, Mg-Al-Fe alloy is fed into molten steel at a certain speed, which is used to partially replace Nb, V, Ti and other elements used for alloying in the refining process, which can promote the solidification and rolling process of steel A large amount of precipitation of the second phase particles in the medium partially replaces the microalloying of Nb, V, Ti, and improves the structure and performance of the steel; due to the low price of metal magnesium, replacing the expensive alloying elements Nb, V, Ti reduces the energy efficiency of the steel production cost. The performance of the magnesium-treated low-carbon microalloy steel obtained by the invention is close to or exceeds that of the reference steel without adding magnesium, and the alloying cost per ton of steel is reduced by more than 25 yuan, which is a new steel microalloying technology.

Description

technical field [0001] The invention relates to the field of steelmaking production, in particular to a low-cost magnesium-treated microalloy steel and a preparation method thereof. Background technique [0002] Low-carbon micro-alloyed steel is a steel in which trace alloy elements (mainly strong carbide-forming elements, such as Nb, V, Ti, Al, etc.) are added to the matrix of ordinary carbon steel and high-strength low-alloy steel. After adding trace alloy elements, the performance of steel can be significantly improved. As users continue to improve the performance of steel, higher requirements are placed on traditional low-carbon micro-alloyed steel. Many companies continue to develop new varieties that meet user needs. Increasing the content of alloying elements or adopting TMCP process to meet the high-performance requirements of steel will increase the cost pressure sharply. In recent years, micro-magnesium treatment technology has attracted widespread attention. At p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/10C22C33/06C22C35/00
CPCC21C7/0006C21C7/0056C21C7/06C21C7/10C22C33/06C22C35/005
Inventor 王德永田俊屈天鹏王慧华
Owner SUZHOU UNIV
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