CN112626416A - Method for improving production efficiency in RH smelting of ultra-low carbon low alloy steel - Google Patents

Method for improving production efficiency in RH smelting of ultra-low carbon low alloy steel Download PDF

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Publication number
CN112626416A
CN112626416A CN202011469815.6A CN202011469815A CN112626416A CN 112626416 A CN112626416 A CN 112626416A CN 202011469815 A CN202011469815 A CN 202011469815A CN 112626416 A CN112626416 A CN 112626416A
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percent
molten steel
minutes
ultra
steel
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CN202011469815.6A
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Inventor
贾崇雪
胡华东
李士波
许建
吴计雨
王松
佟圣刚
黄诚
董苗翠
赵统国
赵珉
张志男
郝燕森
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SD Steel Rizhao Co Ltd
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SD Steel Rizhao Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Abstract

The invention discloses a method for improving the production efficiency in RH smelting of ultra-low carbon low alloy diamond, which comprises the following chemical components in percentage by weight: c is less than or equal to 0.0050 percent, and Si: 0.080-0.120%, Mn: 1.55-1.80%, Ti: 0.020% -0.050%, Nb: 0.020-0.040%, Alt: 0.025-0.065%, B0.0005-0.0010%, P0.070-0.095%, N: less than or equal to 0.0040 percent; (2) optimizing the composition and temperature of the RH arrival molten steel; (3) optimizing an RH decarburization process; (4) the lift gas flow is improved; (5) shortening the RH treatment period. The invention avoids oxygen blowing operation; the burden of RH alloy addition is reduced, the molten steel circulation speed is accelerated, and the decarburization time is shortened by about 2 minutes.

Description

Method for improving production efficiency in RH smelting of ultra-low carbon low alloy steel
Technical Field
The invention belongs to the technical field of metallurgical steelmaking, and particularly relates to a method for improving the production efficiency of RH smelting of ultra-low carbon low alloy steel.
Background
The ultralow-carbon low-alloy high-strength IF steel is used for parts such as inner plate reinforcements of four doors of an automobile, has large processing deformation and strict requirements on inclusions in the steel, and the process route of steel-making production is molten iron KR pretreatment → converter → RH → continuous casting. RH is used as an intermediate process for connecting a converter and continuous casting, and mainly completes the tasks of decarburization, deoxidation, alloying, gas and impurity removal, component adjustment and uniformity, temperature and the like. Because the carbon content of the steel is low, the alloy addition amount is large, and the RH decarburization time and the alloy addition time in the prior art are both longer, the RH treatment period is longer, and is not matched with the casting period of a continuous casting machine, and the continuous casting positive production cannot be met.
With the continuous expansion of the use of steel at home and abroad, the steel requirement for special performance requirements is rapidly increased. Wherein, the products used for automobile parts have strict requirements on the processing performances of stamping, bending and the like. The ultra-low carbon low-alloy high-strength IF steel is mainly based on ultra-low carbon steel, achieves the purpose of high strength by adding certain amounts of Mn and Si elements, and obtains excellent deep drawing performance and non-timeliness by adding micro-alloy elements such as Nb, Ti and B and the like as solid solution strengthening elements, and simultaneously has certain high strength performance, wherein the alloy elements comprise the following components in percentage by weight: c is less than or equal to 0.0050 percent, and Si: 0.080-0.120%, Mn: 1.55-1.80%, Ti: 0.020% -0.050%, Nb: 0.020-0.040%, Alt: 0.025-0.065%, B0.0005-0.0010%, P0.070-0.095%, N: less than or equal to 0.0040 percent. The steel-making production process comprises molten iron KR pretreatment → a converter → RH vacuum treatment → continuous casting. Modern steel works, which are centered on continuous casting, require the casting machine to maintain a constant casting speed in order to ensure the quality of the cast strand, and therefore the casting cycle is substantially constant even when the amount of molten steel per ladle is substantially the same. In order to satisfy the stable production of continuous casting, the RH processing cycle is required to be matched with the casting cycle of continuous casting. When the steel grade is treated by RH, the treatment period is longer due to heavy treatment tasks in the prior art, and the production requirements of a casting machine cannot be met.
Disclosure of Invention
The invention aims to provide a method for improving the production efficiency in RH smelting of ultra-low carbon low alloy steel, by optimizing the oxygen content and the carbon content of RH arrival molten steel, oxygen blowing operation is avoided, and the time can be saved by 2-4 minutes; most ferromanganese and ferrophosphorus are added in the last process, thus lightening the alloy adding burden of RH and shortening the RH treatment time by about 8 minutes; the gas flow is improved after the decarburization lasts for 2 minutes, the molten steel circulation speed is increased, and the decarburization time is shortened by about 2 minutes.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for improving the production efficiency of RH smelting ultra-low carbon low alloy steel,
(1) the chemical components of the ultra-low carbon low alloy steel are as follows by weight percent: c is less than or equal to 0.0050 percent, and Si: 0.080-0.120%, Mn: 1.55-1.80%, Ti: 0.020% -0.050%, Nb: 0.020-0.040%, Alt: 0.025-0.065%, B0.0005-0.0010%, P0.070-0.095%, N: less than or equal to 0.0040 percent;
(2) and (3) optimizing the composition and temperature of RH arrival molten steel:
aRH the oxygen content of the molten steel arriving at the station is not less than 0.040%, and the carbon content is not more than 0.030%;
b, adding most ferromanganese and ferrophosphorus in the converter tapping process, and ensuring that the manganese content of the RH arrival molten steel reaches more than 1.30 percent and the phosphorus content reaches more than 0.070 percent;
cRH the temperature of the arrival molten steel is 1640-1660 ℃;
(3) optimizing an RH decarburization process:
a natural decarburization mode is adopted, and oxygen blowing operation is not carried out;
(4) improving the lift gas flow:
after 2 minutes of RH vacuum decarburization, the lift gas flow rate was adjusted from 80Nm3Increase of/h to 120Nm3/h；
(5) Shortening the RH treatment period:
when the steel grade is produced, the RH treatment period is reduced from 48 minutes to about 35 minutes.
The invention has the following beneficial effects: according to the method for improving the production efficiency in RH smelting of the ultra-low carbon low alloy steel, the oxygen content and the carbon content of RH arrival molten steel are optimized, so that oxygen blowing operation is avoided, and the time can be saved by 2-4 minutes; most ferromanganese and ferrophosphorus are added in the last process, thus lightening the alloy adding burden of RH and shortening the RH treatment time by about 8 minutes; the gas flow is improved after the decarburization lasts for 2 minutes, the molten steel circulation speed is increased, and the decarburization time is shortened by about 2 minutes. By adopting the above measures, the RH treatment period can be shortened by 12 minutes to 14 minutes.
Detailed Description
A method for improving the production efficiency in RH smelting of ultra-low carbon low alloy diamond,
(1) the chemical components of the ultra-low carbon low alloy diamond are as follows by weight percent: c is less than or equal to 0.0050 percent, and Si: 0.080-0.120%, Mn: 1.55-1.80%, Ti: 0.020% -0.050%, Nb: 0.020-0.040%, Alt: 0.025-0.065%, B0.0005-0.0010%, P0.070-0.095%, N: less than or equal to 0.0040 percent;
(2) and (3) optimizing the composition and temperature of RH arrival molten steel:
aRH the oxygen content of the molten steel arriving at the station is not less than 0.040%, and the carbon content is not more than 0.030%;
b, adding most ferromanganese and ferrophosphorus in the converter tapping process, and ensuring that the manganese content of the RH arrival molten steel reaches more than 1.30 percent and the phosphorus content reaches more than 0.070 percent;
cRH the temperature of the arrival molten steel is 1640-1660 ℃;
(3) optimizing an RH decarburization process:
a natural decarburization mode is adopted, and oxygen blowing operation is not carried out;
(4) improving the lift gas flow:
after 2 minutes of RH vacuum decarburization, the lift gas flow rate was adjusted from 80Nm3Increase of/h to 120Nm3/h；
(5) Shortening the RH treatment period:
when the steel grade is produced, the RH treatment period is reduced from 48 minutes to about 35 minutes.
The process flow of the invention comprises the steps of tapping of the converter, adding part of ferromanganese and ferrophosphorus, RH natural deoxidation, alloying, pure degassing and sedation; to ensure the smooth implementation of the new process, the relevant process parameters and operations need to be optimized.
1. Optimizing RH arrival molten steel temperature and oxygen content
Since this steel grade is an ultra-low carbon steel, it is necessary to have sufficient oxygen in the molten steel for deep decarburization at RH. In addition, the temperature of the molten steel is reduced to some extent during the RH treatment. Therefore, if the RH-station melt oxygen content or temperature is not sufficiently high, pre-blowing of oxygen at RH is required. The time is generally 2 minutes to 4 minutes depending on the amount of oxygen blown. In order to avoid oxygen blowing, the oxygen content of the RH arrival molten steel is adjusted to be not less than 0.040 percent, the carbon content is not more than 0.030 percent, and the temperature is 1640-1660 ℃.
2. Optimizing RH inbound molten steel composition
The steel contains a plurality of alloy elements such as silicon, manganese, titanium, niobium, aluminum, boron, phosphorus and the like, the contents of manganese and phosphorus are high, if the alloy is added in RH, the alloying burden of RH is increased, and the RH treatment time is prolonged by about 10 minutes. In order to reduce the adding pressure of the RH alloy, non-precious alloys such as ferromanganese, ferrophosphorus and the like with weak deoxidation capability are added in the tapping process of a converter, so that the content of [ Mn ] in the steel reaches more than 1.30% and the content of [ P ] in the steel reaches more than 0.070% when RH is reached. Therefore, the addition amount of the RH ferromanganese can be reduced by about 16.0 kg/ton steel, the addition amount of the ferrophosphorus can be reduced by about 3.0 kg/ton steel, the addition load of the RH alloy is reduced, and the RH treatment period can be shortened by about 8 minutes.
3. Increasing RH lift gas flow
The RH of the prior art raises the gas flow to 80Nm in the whole course3H, in order to increase the circulating velocity of molten steel, the present invention adjusts the lift gas flow rate to 120Nm 2 minutes after vacuum decarburization3H is used as the reference value. After the process is adjusted, the decarburization time can be shortened by about 2 minutes.

Claims (1)

1. A method for improving the production efficiency in RH smelting of ultra-low carbon low alloy diamond, which is characterized in that,
(1) the chemical components of the ultra-low carbon low alloy diamond are as follows by weight percent: c is less than or equal to 0.0050 percent, and Si: 0.080-0.120%, Mn: 1.55-1.80%, Ti: 0.020% -0.050%, Nb: 0.020-0.040%, Alt: 0.025-0.065%, B0.0005-0.0010%, P0.070-0.095%, N: less than or equal to 0.0040 percent;
(2) and (3) optimizing the composition and temperature of RH arrival molten steel:
aRH the oxygen content of the molten steel arriving at the station is not less than 0.040%, and the carbon content is not more than 0.030%;
b, adding most ferromanganese and ferrophosphorus in the converter tapping process, and ensuring that the manganese content of the RH arrival molten steel reaches more than 1.30 percent and the phosphorus content reaches more than 0.070 percent;
cRH the temperature of the arrival molten steel is 1640-1660 ℃;
(3) optimizing an RH decarburization process:
a natural decarburization mode is adopted, and oxygen blowing operation is not carried out;
(4) improving the lift gas flow:
after 2 minutes of RH vacuum decarburization, the lift gas flow rate was adjusted from 80Nm3Increase of/h to 120Nm3/h；
(5) Shortening the RH treatment period:
when the steel grade is produced, the RH treatment period is reduced from 48 minutes to about 35 minutes.
CN202011469815.6A 2020-12-14 2020-12-14 Method for improving production efficiency in RH smelting of ultra-low carbon low alloy steel Pending CN112626416A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114807731A (en) * 2022-05-20 2022-07-29 山东钢铁集团日照有限公司 Smelting method of steel grade with ultra-low carbon and large silicon-manganese alloy amount

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102719593A (en) * 2011-03-29 2012-10-10 鞍钢股份有限公司 Method for smelting ultra-low carbon steel
CN104233068A (en) * 2014-09-22 2014-12-24 武汉钢铁(集团)公司 440MPa-tensile-strength and hot-galvanizing high-strength steel for internal structure member of sedan, and production method thereof
CN105648328A (en) * 2014-11-13 2016-06-08 许亚夫 IF steel used for automobile plate
CN108842024A (en) * 2018-06-15 2018-11-20 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of phosphorous IF high-strength steel band of 390MPa grades of cold rolling and its LF-RH duplex production technology
CN109161815A (en) * 2018-09-21 2019-01-08 中北大学 A kind of high phosphorus IF steel and its smelting process
CN109837361A (en) * 2019-04-01 2019-06-04 山东钢铁集团日照有限公司 A kind of RH simply connected technique of the anti-wadding stream of low-carbon unskilled steel
CN110747305A (en) * 2019-11-05 2020-02-04 山东钢铁集团日照有限公司 Converter steelmaking method for producing low-sulfur phosphorus-containing IF steel by using RH single-link process

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102719593A (en) * 2011-03-29 2012-10-10 鞍钢股份有限公司 Method for smelting ultra-low carbon steel
CN104233068A (en) * 2014-09-22 2014-12-24 武汉钢铁(集团)公司 440MPa-tensile-strength and hot-galvanizing high-strength steel for internal structure member of sedan, and production method thereof
CN105648328A (en) * 2014-11-13 2016-06-08 许亚夫 IF steel used for automobile plate
CN108842024A (en) * 2018-06-15 2018-11-20 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of phosphorous IF high-strength steel band of 390MPa grades of cold rolling and its LF-RH duplex production technology
CN109161815A (en) * 2018-09-21 2019-01-08 中北大学 A kind of high phosphorus IF steel and its smelting process
CN109837361A (en) * 2019-04-01 2019-06-04 山东钢铁集团日照有限公司 A kind of RH simply connected technique of the anti-wadding stream of low-carbon unskilled steel
CN110747305A (en) * 2019-11-05 2020-02-04 山东钢铁集团日照有限公司 Converter steelmaking method for producing low-sulfur phosphorus-containing IF steel by using RH single-link process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114807731A (en) * 2022-05-20 2022-07-29 山东钢铁集团日照有限公司 Smelting method of steel grade with ultra-low carbon and large silicon-manganese alloy amount

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Application publication date: 20210409