CN102851442B - Low-nitrogen and ultra-low-sulfur steel control method - Google Patents
Low-nitrogen and ultra-low-sulfur steel control method Download PDFInfo
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- CN102851442B CN102851442B CN201110177868.5A CN201110177868A CN102851442B CN 102851442 B CN102851442 B CN 102851442B CN 201110177868 A CN201110177868 A CN 201110177868A CN 102851442 B CN102851442 B CN 102851442B
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- molten steel
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- target temperature
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 94
- 239000010959 steel Substances 0.000 title claims abstract description 94
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 15
- 239000011593 sulfur Substances 0.000 title claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229910052786 argon Inorganic materials 0.000 claims abstract description 22
- 239000002893 slag Substances 0.000 claims abstract description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 11
- 239000004411 aluminium Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000012141 concentrate Substances 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 6
- 230000023556 desulfurization Effects 0.000 abstract description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000008188 pellet Substances 0.000 abstract 1
- 239000005864 Sulphur Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a low-nitrogen and ultra-low-sulfur steel control method, which comprises the steps of slagging off molten steel, adding aluminum slagging pellets, and covering a tank top; then, the molten steel in the LF furnace is heated to a target temperature in a centralized manner, argon is introduced for stirring, and then aluminum wire segments are added into the molten steel; and modulating the LF top slag component, adding an aluminum wire segment again, and finally, maintaining the pressure by VD and introducing argon. Compared with the prior art, the invention has the beneficial effects that: according to the method, refining process parameters are optimized, large-flow argon stirring desulfurization operation is not performed in the LF treatment process, deep desulfurization is transferred to VD equipment to be completed, the contents of sulfur and nitrogen in steel are effectively reduced, the purity of the steel is improved, and the product quality is ensured.
Description
Technical field
The present invention relates to steel-making refining art, particularly the low nitrogen of one, ultralow-sulfur steel control method.
Background technology
At present, high-level fine work steel requires higher for sulphur, nitrogen element in steel.For employing " desulfurizing iron-converter-LF-casting machine " production technique, in refining controlling process, especially LF stove mainly completes dark desulfurization task, can sulphur be controlled at below 15ppm, but treating processes nitrogen pick-up is serious, generally increases about 50ppm, causes nitrogen content high.The large argon gas stirring desulphurization of LF is the major cause of nitrogen pick-up, in order to reduce nitrogen in steel content, and completes dark desulfurization task, is badly in need of improving technique.
Summary of the invention
The object of this invention is to provide a kind of low nitrogen, ultralow-sulfur steel control method, the method is by the optimization of processing parameter, and LF treating processes does not carry out the operation of large discharge argon gas stirring desulphurization, dark desulfurization is transferred in VD equipment and completes, effectively control nitrogen in steel content.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of low nitrogen, ultralow-sulfur steel control method, is characterized in that, comprise the following steps:
1) converter adopts the mode of skimming to remove oxidisability top slag to molten steel after adopting tapping, then adds 1.6 ~ 2.4kg/ ton steel spherical Al slag, builds tank deck;
2) LF adopts and concentrates type of heating, and molten steel heats 18 ~ 25 minutes, to measuring temp of molten steel by first time; Molten steel heats 8 ~ 12 minutes, to measuring temp of molten steel by second time; Compare according to the temperature recorded after the heating of the second time of molten steel and target temperature T (steel grade liquidus line+80 DEG C), if the temperature value of the molten steel recorded is within the scope of target temperature T ± 5 DEG C, then no longer molten steel is carried out Temperature Treatment; If the temperature of the molten steel recorded is higher than target temperature T+5 DEG C, then by molten steel naturally cooling until temperature reaches target temperature T ± 5 DEG C scope; If the liquid steel temperature recorded is lower than target temperature T-5 DEG C, then molten steel is heated again until reach within the scope of target temperature T ± 5 DEG C;
3) pass into argon gas and stir molten steel, the argon flow amount scope passed into is 200 ~ 350NL/min;
4) in molten steel, add the aluminium of content more than 99.9%, the add-on of aluminium is 0.6 ~ 1.0kg/ ton steel;
5) modulate LF and push up slag component, top basicity of slag scope is the Al that 3.5 ~ 4.5, LF pushes up slag
2o
3mass content scope is 27 ~ 35%;
6) in molten steel, add content aluminium more than 99.9% again, the add-on of aluminium is 1.4 ~ 2.0kg/ ton steel;
7) scope is 15 ~ 20 minutes the VD equipment dwell time, and pass into argon gas to molten steel in pressure maintaining period, the argon flow amount scope passed into is 400 ~ 500NL/min,
8) VD is broken empty.
Compared with prior art, the invention has the beneficial effects as follows: the method is by optimizing refinery practice parameter, the operation of large discharge argon gas stirring desulphurization is not carried out in LF treating processes, dark desulfurization is transferred in VD equipment and completes, effectively reduce the content of sulphur in steel and nitrogen, improve purity of steel, ensure that quality product.
Embodiment
Embodiment one, adopts the method to produce X70 steel, comprises the following steps:
1) converter adopts the mode of skimming to remove oxidisability top slag to molten steel after adopting tapping, then adds 1.8kg/ ton steel spherical Al slag, builds tank deck;
2) LF adopts and concentrates type of heating, and molten steel is heated 18 minutes, to measuring temp of molten steel by first time; Molten steel is heated 10 minutes by second time, and to measuring temp of molten steel, the temperature recorded is 1622 DEG C, meets the temperature range of X70 steel target temperature 1620 DEG C ± 5 DEG C, so no longer continue heating;
3) pass into argon gas and stir molten steel, the argon flow amount scope passed into is 200NL/min;
4) in molten steel, add aluminum steel section, the add-on of aluminum steel section is 0.7kg/ ton steel;
5) modulate LF and push up slag component, top basicity of slag scope is the Al that 3.5, LF pushes up slag
2o
3mass content scope is 28%;
6) in molten steel, add aluminum steel section again, the add-on of aluminum steel section is 1.6kg/ ton steel;
7) scope is 15 minutes the VD equipment dwell time, and pass into argon gas to molten steel in pressure maintaining period, the argon flow amount scope passed into is 420NL/min,
8) VD is broken empty.
Embodiment two, adopts the method to produce GCr15 steel, comprises the following steps:
1) converter adopts the mode of skimming to remove oxidisability top slag to molten steel after adopting tapping, then adds 2.2kg/ ton steel spherical Al slag, builds tank deck;
2) LF adopts and concentrates type of heating, and molten steel is heated 20 minutes, to measuring temp of molten steel by first time; Molten steel is heated 12 minutes by second time, and to measuring temp of molten steel, the temperature recorded is 1565 DEG C, meets the temperature range of GCr15 steel target temperature 1565 DEG C ± 5 DEG C, so no longer continue heating;
3) pass into argon gas and stir molten steel, the argon flow amount scope passed into is 300NL/min;
4) in molten steel, add aluminum steel section, the add-on of aluminum steel section is 0.8kg/ ton steel;
5) modulate LF and push up slag component, top basicity of slag scope is the Al that 4, LF pushes up slag
2o
3mass content scope is 30%;
6) in molten steel, add aluminum steel section again, the add-on of aluminum steel section is 1.8kg/ ton steel;
7) scope is 18 minutes the VD equipment dwell time, and pass into argon gas to molten steel in pressure maintaining period, the argon flow amount scope passed into is 450NL/min,
8) VD is broken empty.
Above embodiment is two most preferred embodiments selected in numerous specific embodiment, but is not the restriction to protection domain, and the data area limited in detail in the claims all can obtain good effect.
Claims (1)
1. low nitrogen, a ultralow-sulfur steel control method, is characterized in that, comprise the following steps:
1) converter adopts the mode of skimming to remove oxidisability top slag to molten steel after adopting tapping, then adds 1.6 ~ 2.4kg/ ton steel spherical Al slag, builds tank deck;
2) LF adopts and concentrates type of heating, and molten steel heats 18 ~ 25 minutes, to measuring temp of molten steel by first time; Molten steel heats 8 ~ 12 minutes, to measuring temp of molten steel by second time; Compare according to the temperature recorded after the second time heating of molten steel and target temperature T, described target temperature T is steel grade liquidus line+80 DEG C; If molten steel within the scope of target temperature T ± 5 DEG C, is then no longer carried out Temperature Treatment by the temperature value of the molten steel recorded; If the temperature of the molten steel recorded is higher than target temperature T+5 DEG C, then by molten steel naturally cooling until temperature reaches target temperature T ± 5 DEG C scope; If the liquid steel temperature recorded is lower than target temperature T-5 DEG C, then molten steel is heated again until reach within the scope of target temperature T ± 5 DEG C;
3) pass into argon gas and stir molten steel, the argon flow amount scope passed into is 200 ~ 350NL/min;
4) in molten steel, add the aluminium of content more than 99.9%, the add-on of aluminium is 0.6 ~ 1.0kg/ ton steel;
5) modulate LF and push up slag component, top basicity of slag scope is the Al that 3.5 ~ 4.5, LF pushes up slag
2o
3mass content scope is 27 ~ 35%;
6) in molten steel, add content aluminium more than 99.9% again, the add-on of aluminium is 1.4 ~ 2.0kg/ ton steel;
7) scope is 15 ~ 20 minutes the VD equipment dwell time, and pass into argon gas to molten steel in pressure maintaining period, the argon flow amount scope passed into is 400 ~ 500NL/min,
8) VD is broken empty.
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| CN201110177868.5A CN102851442B (en) | 2011-06-29 | 2011-06-29 | Low-nitrogen and ultra-low-sulfur steel control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110177868.5A CN102851442B (en) | 2011-06-29 | 2011-06-29 | Low-nitrogen and ultra-low-sulfur steel control method |
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| Publication Number | Publication Date |
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| CN102851442A CN102851442A (en) | 2013-01-02 |
| CN102851442B true CN102851442B (en) | 2014-12-31 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104862449B (en) * | 2015-06-10 | 2016-08-31 | 武汉钢铁(集团)公司 | The control method of nitrogen in a kind of steel for saw blade substrate |
| CN107794345A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | Secondary slagging method for producing low-silicon aluminum killed steel by using L F furnace |
| CN107630167B (en) * | 2017-11-12 | 2019-04-23 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of extremely low carbon high conductivity steel |
| CN115305306B (en) * | 2021-05-07 | 2023-11-24 | 河北龙凤山铸业有限公司 | Control method for preparing 4N-grade high-purity iron with ultralow sulfur and ultralow nitrogen through fire purification |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760585A (en) * | 2010-02-03 | 2010-06-30 | 衡阳华菱连轧管有限公司 | Deep-desulphurizing slag system containing BaO and Li2O and method for producing ultralow-sulfur steel by adopting same |
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- 2011-06-29 CN CN201110177868.5A patent/CN102851442B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760585A (en) * | 2010-02-03 | 2010-06-30 | 衡阳华菱连轧管有限公司 | Deep-desulphurizing slag system containing BaO and Li2O and method for producing ultralow-sulfur steel by adopting same |
Non-Patent Citations (2)
| Title |
|---|
| EAF_LF_VD_WF_CC工艺生产低氮钢技术;周世祥 等;《特殊钢》;19981231;第19卷(第1期);1-6 * |
| 包钢VD真空脱氢的工艺参数;吴铿 等;《化工冶金》;20001031;第21卷(第4期);426-429 * |
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