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A method for preparing low-sulfur, low-nitrogen, and low-hydrogen steel at low cost and its product

A low-cost, high-quality steel technology, applied in the field of steelmaking, can solve the problems of long process cycle and high production cost, and achieve the effect of speeding up production rhythm, reducing process cost, and facilitating rapid desulfurization

Active Publication Date: 2022-02-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the method provided by the Chinese patent meets the requirements of low-sulfur, low-hydrogen and low-nitrogen content of steel grades, it adopts LF+RH double refining treatment, which has a long process cycle and high production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this example, steel type L245DP is used, and the steel volume is 213T, the liquid phase temperature is 1516 ° C, oxygen activity A 0 It is 580 ppm; the slag thickness D of the steel slag is 0.04m, the thickness of the slag is 0.01 M, the thickness of the slag is 0.03 m; the use of the process is the primary refining furnace smelting, VD furnace vacuum refining and continuous casting.

[0056] Specifically, a method of preparing low-cost low-sulfur low hydrogen steel in this embodiment includes:

[0057] (1) Transforceral startlight: Using normal circumference to the line baking steel bag, the steel temperature before the steel is 1698 ° C; the steel temperature after the end of the steel is 1650 ° C; after the end of the steel, the S% of the steel is 46 ppm, steel slag The slag thickness is 0.04m; the internal wall temperature before the steel bag is 1050 ° C; the steel and steel slag are deoxidized and alloyed; deoxidation, including: adding aluminum to steel and steel ...

Embodiment 2

[0061] In this example, the steel type Q345DH, the steel volume is 302T, the liquid phase temperature 1517 ° C, oxygen activity A 0 It is 556 ppm; the slag thickness D of the steel slag is 0.05m, the thickness of the slag is 0.01 m, the thickness of the slag is 0.04 m; the use of the process is the primary refining furnace smelting, VD furnace vacuum refining and continuous casting.

[0062] Specifically, a method of preparing low-cost low-sulfur low hydrogen steel in this embodiment includes:

[0063] (1) Transforceral primary refining: Using normal circumference to the line baking steel bag, the steel temperature before the steel is 1705 ° C; the steel temperature after the end of the steel is 1640 ° C; after the end of the steel, the S% of the steel is 69 ppm, steel slag The slag thickness is 0.05m; the internal wall temperature before the steel bag is 1080 ° C; the steel and steel slag are deoxidized and alloyed; deoxidation, including: adding aluminum to steel and steel slag,...

Embodiment 3

[0067] This example is selected from the steel type Q345Z-25, the steel volume is 152T, the liquid phase temperature is 1517 ° C, oxygen activity A 0 It is 541 ppm; the slag thickness D of the steel slag is 0.04m, the thickness of the slag is 0.01 M, the thickness of the slag is 0.03 m; the use process is the electric furnace primary, VD furnace vacuum refining and continuous casting.

[0068] Specifically, a method of preparing low-cost low-sulfur low hydrogen steel in this embodiment includes:

[0069] (1) Transforcerard: The steel bag before the normal turn is used. The steel temperature before the steel is 1706 ° C; the steel temperature after the end of the steel is 1654 ° C; after the end of the steel, the S% of the steel is 38 ppm, steel slag The slag thickness is 0.04m; the inner wall temperature before the steel bag is 1180 ° C; the steel and steel slag are deoxidized and alloyed; deoxidation, including: adding aluminum to steel and steel slag, the aluminum After the amou...

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PUM

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Abstract

The invention discloses a low-cost method for preparing low-sulfur, low-nitrogen, and low-hydrogen steel, which comprises: smelting in a primary furnace, vacuum refining in a VD furnace and continuous casting. The temperature of molten steel before smelting and tapping in the primary smelting furnace is (T L +180℃)±10℃; the temperature of molten steel at the end of tapping is (T L +130°C)±10°C; S% in the molten steel after tapping is ≤80ppm, and the slag thickness of the steel slag is less than 0.07m; the temperature of the molten steel when VD enters the station is (T L +120℃)±10℃; the temperature of molten steel after vacuum refining in VD furnace is (T L +60℃)±10℃; the temperature of molten steel in the continuous casting tundish is (T L +20℃)±5℃; T L is the liquidus temperature. In the low-cost method for preparing low-sulfur, low-nitrogen, and low-hydrogen steel provided by the present invention, the contents of sulfur, hydrogen, and nitrogen in molten steel can be efficiently reduced to below the target value, and at the same time, the process cost is greatly reduced, and the refining time is reduced , to speed up the production rhythm and improve the refining efficiency.

Description

Technical field [0001] The present invention belongs to the technical field of steelmaking, particularly relates to the preparation of low-cost low-sulfur low-nitrogen-hydrogen furnace volume VD large a steel material refining process method and fast-paced product. Background technique [0002] Sulfur, usually in the form of MnS inclusions in the molten steel. MnS inclusions in the steel base compared to having good plasticity, which is easily deformed elongated during rolling. MnS inclusions will have a very serious impact on the performance of steel Z. Thus, high-quality steel required to have strict requirements for the sulfur content, the sulfur content must be controlled 0.005% or less. Further, MnS in the steel in the acidic environment that generates a major factor SSCC and HIC cracks, sulfur content should be controlled 0.002% or less, 0.0015% or less even in control. [0003] For the steel plate, the hydrogen and nitrogen content of the steel material also affect the tes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C21C7/10C21C7/00C21C7/06C21C7/076C21C7/072C21C7/064C22C38/06
CPCC22C33/04C21C7/10C21C7/0006C21C7/06C21C7/076C21C7/072C21C7/064C22C38/06Y02P10/20
Inventor 朱志远朱国森刘金刚李海波孙齐松刘厚权王国连闫占辉郝宁高宠光王勇马跃陈涛丁宁李战军周磊王宏宇关春阳李阳邓小旋胡显堂石树东初仁生杨荣光王东柱
Owner SHOUGANG CORPORATION