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A converter steelmaking method for producing low-sulfur and phosphorous-containing IF steel by rh single process

A converter steelmaking and process technology, applied in the field of steelmaking, can solve the problems of mismatching casting cycle of casting machines, lack of desulfurization conditions, lack of temperature adjustment means, etc. Effect

Active Publication Date: 2021-09-21
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because RH does not have desulfurization conditions and lacks effective temperature adjustment means, strict requirements are put forward for the oxygen content, sulfur content and temperature of the molten steel at the end of the previous converter process
In addition, when producing this type of steel, the time to add the alloy in the conventional process is to add it after RH decarburization is completed. Because the amount of alloy in this steel type is relatively large, if all the alloy is added in the RH process, it will take about 10 minutes. The RH processing time is shortened, so that the RH does not match the continuous casting production cycle, which is not conducive to the production organization of the steelmaking plant
The existing process used for the production of this steel type mainly has the following disadvantages: 1. The carbon and sulfur content occasionally appear out of bounds; 2. The temperature is not easy to control accurately; 3. The RH treatment cycle is long, which does not match the casting cycle of the casting machine

Method used

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  • A converter steelmaking method for producing low-sulfur and phosphorous-containing IF steel by rh single process
  • A converter steelmaking method for producing low-sulfur and phosphorous-containing IF steel by rh single process
  • A converter steelmaking method for producing low-sulfur and phosphorous-containing IF steel by rh single process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Heat number: 191354500, steel grade: SR250P1, total charge: 241t.

[0056] 1. Conditions of molten iron and steel scrap in the furnace

[0057] Table 1 Situation of molten iron and steel scrap in the furnace

[0058]

[0059] 2. Addition of slag making material

[0060] The amount of lime added: 11.2t, the amount of lightly burned dolomite added: 4.8t. Basicity of final slag of converter: 3.35, MgO content of final slag of converter: 10.3%.

[0061] 3. End point control of converter

[0062] End point oxygen content: 1002ppm, end point sulfur content: 0.0028%, end point temperature: 1738°C.

[0063] 4. Alloy addition during converter tapping

[0064] The amount of ferromanganese added: 3606kg, the amount of ferrophosphorus added: 586kg.

[0065] 5. Molten steel situation at the RH station

[0066] Oxygen content of molten steel at the arrival station: 480ppm, arrival temperature: 1648°C.

[0067] 6. RH treatment

[0068] The RH treatment time is 36 minutes; ...

Embodiment 2

[0070] Heat number: 192423600, steel grade: SR250P1, total charge: 245t.

[0071] 1. Conditions of molten iron and steel scrap in the furnace

[0072] Table 2 Situation of molten iron and steel scrap in the furnace

[0073]

[0074] 2. Addition of slag making material

[0075] The amount of lime added: 12.8t, the amount of lightly burned dolomite added: 5.2t. Basicity of final slag of converter: 3.40, MgO content of final slag of converter: 10.5%.

[0076] 3. End point control of converter

[0077] End point oxygen content: 1142ppm, end point sulfur content: 0.0040%, end point temperature: 1745°C.

[0078] 4. Alloy addition during converter tapping

[0079] The amount of ferromanganese added: 3880kg, the amount of ferrophosphorus added: 610kg.

[0080] 5. Molten steel situation at the RH station

[0081] Oxygen content of molten steel at the arrival station: 465ppm, arrival temperature: 1651°C.

[0082] 6. RH treatment

[0083] The RH treatment time is 35 minutes; ...

Embodiment 3

[0085] Heat number: 191354600, steel grade: SR250P1, total charge: 245t.

[0086] 1. Conditions of molten iron and steel scrap in the furnace

[0087] Table 3 Situation of molten iron and steel scrap in the furnace

[0088]

[0089] 2. Addition of slag making material

[0090] The amount of lime added: 13.4t, the amount of lightly burned dolomite added: 5.7t. Basicity of final slag of converter: 3.38, MgO content of final slag of converter: 10.4%.

[0091] 3. End point control of converter

[0092] End point oxygen content: 978ppm, end point sulfur content: 0.0028%, end point temperature: 1742°C.

[0093] 4. Alloy addition during converter tapping

[0094] The amount of ferromanganese added: 3510kg, the amount of ferrophosphorus added: 580kg.

[0095] 5. Molten steel situation at the RH station

[0096] Oxygen content of molten steel at the arrival station: 426ppm, arrival temperature: 1643°C.

[0097] 6. RH treatment

[0098] The RH treatment time is 37 minutes; t...

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Abstract

The invention discloses a converter steelmaking method for producing low-sulfur and phosphorus-containing IF steel by using RH single process, which comprises the following steps: optimizing converter loading system, optimizing slagging system, converter end point control and deoxidation alloying system; the invention The designed converter steelmaking method selects the appropriate Si content and high-temperature molten iron, and increases the proportion of molten iron, which is conducive to increasing the heat of the converter, creating conditions for increasing the temperature of the molten steel at the end of the converter and making up for the temperature drop of molten steel in subsequent processes, and providing temperature protection for RH treatment Appropriately increase the amount of converter lime added and increase the temperature of molten steel, which is conducive to promoting the desulfurization reaction and ensuring that the sulfur content of molten steel meets the requirements; controlling the high oxygen content of molten steel at the end of the converter is to add some alloys in the converter process and ensure RH molten steel The oxygen content at the arrival station provides a guarantee to meet the decarburization requirements, and reduces the burden of RH alloy addition, which is conducive to shortening the RH treatment cycle.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a converter steelmaking method for producing low-sulfur and phosphorus-containing IF steel by using an RH single-pass process. Background technique [0002] Low-sulfur and phosphorus-containing high-strength IF steel is based on ultra-low carbon steel. It achieves high strength by adding a certain amount of elements such as P, Mn and Si, and adds solid solution strengthening elements such as microalloying elements Nb, Ti and B to obtain Excellent deep drawing performance and non-aging performance, its steelmaking production process is molten iron KR pretreatment→converter→RH→continuous casting. In production, there are problems such as the temperature of each process and the content of carbon and sulfur are not easy to control, the RH treatment cycle is long, and the production cycle of the casting machine does not match. [0003] Ultra-low-carbon, low-sulfur, phosphorus-con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/36C21C7/10C21C7/064C21C7/06C21C7/00C21C7/068
CPCC21C5/28C21C5/36C21C7/0006C21C7/06C21C7/064C21C7/068C21C7/10Y02P10/20
Inventor 梁亚贾崇雪尹翠兰张磊丁中康华伟刘晓美李士波王兴王松
Owner SD STEEL RIZHAO CO LTD
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