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A kind of steelmaking production method of 600mpa grade peritectic high alumina trip steel

A production method and peritectic technology, applied in the field of metallurgy, can solve the problems of strong crack sensitivity, large fluctuation of the liquid level of the continuous casting mold, internal segregation of the slab and difficulty in surface cracks, etc. The effect of stable production process control

Active Publication Date: 2021-07-09
唐山钢铁集团高强汽车板有限公司 +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Since the carbon content of the 600MPa grade peritectic high-alumina TRIP steel is in the strong peritectic region in the composition design, it is easy to produce strong peritectic reaction, and the liquid level of the continuous casting mold caused by the peritectic reaction fluctuates greatly, resulting in poor internal quality
The high aluminum content reacts with the mold powder during the casting process, resulting in poor heat transfer in the mold, and the casting slab is prone to crack defects
[0004] The main difficulty of 600MPa peritectic high-alumina TRIP steel lies in the control of surface cracks and internal segregation of the slab. This steel has a high aluminum content and a carbon content in the peritectic region, which is highly sensitive to cracks. According to the traditional process Methods The surface of the slab is prone to crack defects and internal segregation problems, which have a great impact on the quality of hot rolling and cold rolling. How to control the internal segregation and surface cracks of the slab is very difficult

Method used

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  • A kind of steelmaking production method of 600mpa grade peritectic high alumina trip steel
  • A kind of steelmaking production method of 600mpa grade peritectic high alumina trip steel
  • A kind of steelmaking production method of 600mpa grade peritectic high alumina trip steel

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Embodiment 1

[0033] The steelmaking production method of 600MPa peritectic high-alumina TRIP steel in this embodiment includes molten iron desulfurization, converter smelting, LF refining, RH treatment, and continuous casting of medium slabs. The specific process steps are as follows:

[0034] (1) Desulfurization process of molten iron: After spraying magnesium powder and lime on the ladle for desulfurization, the slag is removed, and the molten iron is desulfurized to S: 0.010%;

[0035] (2) Converter smelting process: the temperature of molten iron entering the furnace is 1280°C, C: 4.1%, S: 0.010%, P: 0.110%; S: 0.009%, P: 0.009%, the end point temperature is 1670°C, no steel sample is taken after the first carbon drawing of the converter, the angle of the converter body is restored to 0°, the bottom blowing and strong stirring is 120s, and the bottom blowing intensity is 0.18m 3 / t*min, the steel is tapped directly after bottom blowing and strong stirring, the tapping time is 3min, 2.5...

Embodiment 2

[0041] The steelmaking production method of 600MPa peritectic high-alumina TRIP steel in this embodiment includes molten iron desulfurization, converter smelting, LF refining, RH treatment, and continuous casting of medium slabs. The specific process steps are as follows:

[0042] (1) Desulfurization process of molten iron: After spraying magnesium powder and lime on the ladle for desulfurization, the slag is removed, and the molten iron is desulfurized to S: 0.005%;

[0043] (2) Converter smelting process: The temperature of molten iron entering the furnace is 1350°C, C: 3.5%, S: 0.005%, P: 0.150%; the basicity of the final slag of converter smelting is 4.5, and C: 0.035%, S: 0.005%, P: 0.010%, the end point temperature is 1690°C, no steel sample is taken after the first carbon drawing of the converter, the angle of the converter body is restored to 0°, the bottom blowing and strong stirring is 125s, and the bottom blowing intensity is 0.15m 3 / t*min, the steel is tapped dire...

Embodiment 3

[0049] The steelmaking production method of 600MPa peritectic high-alumina TRIP steel in this embodiment includes molten iron desulfurization, converter smelting, LF refining, RH treatment, and continuous casting of medium slabs. The specific process steps are as follows:

[0050] (1) Desulfurization process of molten iron: After spraying magnesium powder and lime on the ladle for desulfurization, the slag is removed, and the molten iron is desulfurized to S: 0.008%;

[0051] (2) Converter smelting process: the temperature of the molten iron entering the furnace is 1200°C, the molten iron entering the furnace is C: 4.5%, S: 0.008%, P: 0.150%; S: 0.008%, P: 0.008%, the end point temperature is 1680°C, no steel sample is taken after the converter is pulled carbon once, the angle of the converter body is restored to 0°, the bottom blowing and strong stirring is 130s, and the bottom blowing intensity is 0.16m 3 / t*min, the steel is tapped directly after bottom blowing and strong s...

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Abstract

The invention discloses a steelmaking production method of 600MPa peritectic high-alumina TRIP steel. The steelmaking production method comprises the steps of molten iron desulfurization, converter smelting, LF refining, RH treatment and medium slab continuous casting. The invention produces continuous casting slabs that meet the requirements by applying the rapid tapping process of the converter, the LF rapid slagging process, the RH degassing process, and the continuous casting slab control process. The production process is stable and can effectively control the full oxygen and Nitrogen content, O≤5ppm, N≤30ppm, the quality control of the steelmaking slab is good, the segregation grade of the slab is below C class 1.5, and the surface of the slab has no cracks; the slab can be used for hot rolling to produce high-quality hot-rolled coils , cold-rolled to produce high-quality cold-rolled products.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steelmaking production method of 600MPa-level peritectic high-aluminum TRIP steel. Background technique [0002] In recent years, with the rapid development of China's automobile industry, energy conservation and environmental protection have become an inevitable trend in the development of modern automobiles. One of the important measures is to reduce the weight of automobiles. The use of high-strength TRIP steel to replace conventional steel has been adopted by major domestic companies. To carry out research, the composition control range of 600MPa peritectic high-alumina TRIP steel: grade F590QX composition mass percentage content is: C: 0.13~0.15%, Si≤0.40%, Mn≤1.80%, P≤0.020%, S≤0.010%, Als: 0.45-0.60%. [0003] Since the carbon content of the 600MPa grade peritectic high-alumina TRIP steel is in the strong peritectic region in the composition design, it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C33/06C21C1/02C21C5/28C21C7/10B22D11/111B22D11/20B22D11/22
CPCB22D11/111B22D11/20B22D11/225C21C1/02C21C5/28C21C7/10C22C33/06C22C38/02C22C38/04C22C38/06
Inventor 马德刚李经哲李波王建兴王言峰王耐李会亚马旭朝刘焕章
Owner 唐山钢铁集团高强汽车板有限公司
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