CN103572004B - RH composite decarburization method - Google Patents
RH composite decarburization method Download PDFInfo
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- CN103572004B CN103572004B CN201310482607.3A CN201310482607A CN103572004B CN 103572004 B CN103572004 B CN 103572004B CN 201310482607 A CN201310482607 A CN 201310482607A CN 103572004 B CN103572004 B CN 103572004B
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- oxygen
- steel
- vacuum
- decarburization
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- 238000005261 decarburization Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002131 composite material Substances 0.000 title abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000001301 oxygen Substances 0.000 claims abstract description 36
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000007787 solid Substances 0.000 claims abstract description 14
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 7
- 150000001875 compounds Chemical class 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 4
- 238000005262 decarbonization Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to an RH composite decarburization method, which comprises the following steps: 1) decarbonizing RH decarbonization oxygen supply by adopting a combination mode of solid oxygen and high-pressure oxygen blowing; 2) when the pressure in the vacuum chamber reaches 20-25 kPa, 0.1-3.0 kg/ton of steel containing Fe is added2O3The solid spheres of (4); 3) controlling the vacuum pressure at 10-15 kpa, and adding 0.1-3.0 kg/ton of steel containing Fe2O3The solid spheres of (4); 4) automatically vacuumizing; 5) the top lance oxygen blowing is started to be reduced; 6) the gas flow is increased in the early stage of oxygen blowing; 7) stopping oxygen blowing when the carbon in the steel reaches below 100 ppm; 8) and the circulation is finished, and the unloading can be realized. Compared with the prior art, the invention has the beneficial effects that: realize quick, stable and safe decarburizationBefore RH decarburization, the carbon content of molten steel is distributed to 1000-2000 ppm, and the carbon content of finished products is below 350 ppm.
Description
Technical field
The present invention relates to metallurgical technology field, particularly to a kind of RH compound decarburization method.
Background technology
The decarburization steel grade of RH process both at home and abroad typically enters RH carbon content less than 650ppm, high-carbon less than 800ppm.Anshan iron and steel plant
Produce low-carbon (LC) special steel, steel making working procedure carrys out carbon and is distributed in 1500～2000ppm, finished product carbon at below 350ppm, this composition model
Enclosing carbon content typically uses VOD decarburization, Steelmaking In Anshan Iron And Steel Company head factory not to have VOD, needs to carry out decarburization at RH, needs to take off carbon
About 100ppm, under the conditions of medium high carbon, RH decarburization exists decarburization time length, interim response acutely the problems such as potential safety hazard,
Do not produce precedent both at home and abroad.
Summary of the invention
It is an object of the invention to provide a kind of RH compound decarburization method quick, steady, safe under the conditions of higher carbon content.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of RH compound decarburization method, comprises the following steps:
1) RH decarburization oxygen supply is taked solid oxygen to add to blow the high pressure oxygen mode of combining and carry out decarburization, enter RH temperature and control
1570～1580 DEG C, it is to avoid too high or too low for temperature when RH deoxidation；
2) carry out Stress control, when vacuum indoor pressure reaches 20～25kPa, add containing Fe2O3Solid ball 0.1～
3.0kg/ ton steel, is continuously added to 1～3 batch；
3) in vacuum chamber after liquid level reacting balance, vacuum indoor pressure is controlled 10～15kPa, add containing Fe2O3Consolidate
Body ball 0.1～3.0kg/ ton steel, is continuously added to 1～3 batch；
4) when vacuum indoor carbon content reaches 800～900ppm, rotate automatic vacuum, vacuum chamber pressure is controlled
0.2±0.01kPa；
5) when vacuum reaches 0.2 ± 0.01kPa, starting to reduce top gun oxygen blast, initial rifle position sets 6.5～8.5m,
Every oxygen blast 50～200Nm3, reduce rifle position 0.1～0.2m, finally reduce minimum rifle position；
6) oxygen blast early stage lift gas flow-control is 500～600Nl/min, and the lift gas flow-control of oxygen blast later stage exists
600～800Nl/min；
7) when in steel dissolved oxygen reach >=100ppm time, in steel, carbon reaches below 100ppm, stops oxygen blast；
8) circulation terminates to add 1.30～1.80kg aluminum steel sections/ton steel-deoxidizing, and non-uniform components 3min can break sky and take out of.
Described containing Fe2O3The Fe of solid ball2O3Content mass percent >=90%.
Compared with prior art, the invention has the beneficial effects as follows:
A kind of RH compound decarburization method, under meeting technological requirement, it is achieved quickly, steadily, decarburization safely, be used for
Produce that carbon content of molten steel before RH decarburization is distributed in 1000～2000ppm, finished product carbon is at the low-carbon (LC) special steel of below 350ppm.
Detailed description of the invention
Below the detailed description of the invention of the present invention is further illustrated:
Embodiment one
Producing as a example by stainless steel by 105 tons of ladles, a kind of antivacuum process reduces hydrogen content method in steel, including following step
Rapid:
1) RH decarburization oxygen supply is taked solid oxygen to add to blow the high pressure oxygen mode of combining and carry out decarburization, enter RH temperature and control
1575～1580 DEG C, it is to avoid too high or too low for temperature when RH deoxidation；
2) carry out Stress control, when vacuum indoor pressure reaches 20～22kPa, add 2.0kg/ ton steel at intervals of two minutes
Containing Fe2O3Solid ball, be continuously added to 2 batches；
3), in vacuum chamber after liquid level reacting balance, control vacuum indoor pressure, 10～12kPa, to add at intervals of two minutes
The 2.0kg/ ton steel solid ball containing Fe2O3, is continuously added to 2 batches, often adds 1.0kg/ ton steel containing Fe2O3Solid ball reduce carbon
Content 100ppm；
4) when vacuum indoor carbon content reaches 800ppm, automatic vacuum is rotated, vacuum chamber pressure is controlled 0.2 ±
0.01kPa；
5) when vacuum reaches 0.2 ± 0.01kPa, starting to reduce top gun oxygen blast, oxygen flux control is at 1100Nm3/h,
Initial rifle position sets 6.5m, every oxygen blast 200Nm3, reduce rifle position 0.2m, minimum rifle position 6.15m, average every middle 100Nm3
Oxygen reduces carbon content 150ppm；
6) oxygen blast early stage lift gas flow-control exists in 500Nl/min, the lift gas flow-control of oxygen blast later stage
700Nl/min；
7) when in steel dissolved oxygen reach >=100ppm time, accumulative oxygen blast 500Nm3, in steel, carbon reaches below 100ppm, stops
Oxygen blast；
8) circulation terminates to add 1.50kg aluminum steel section/ton steel-deoxidizing, and non-uniform components 3min can break sky and take out of.
Above-mentioned containing Fe2O3The Fe of solid ball2O3Content mass percent >=90%.
Achieve the molten steel decarburization of initial carbon 1600ppm to 55ppm at RH through above operation.
Claims (2)
1. a RH compound decarburization method, it is characterised in that comprise the following steps:
1) RH decarburization oxygen supply is taked solid oxygen to add to blow the high pressure oxygen mode of combining and carry out decarburization, enter RH temperature and control
1570～1580 DEG C, it is to avoid too high or too low for temperature when RH deoxidation；
2) carry out Stress control, when vacuum indoor pressure reaches 20～25kPa, add containing Fe2O3Solid ball 0.1～
3.0kg/ ton steel, is continuously added to 1～3 batch；
3) in vacuum chamber after liquid level reacting balance, vacuum indoor pressure is controlled 10～15kPa, add containing Fe2O3Consolidate
Body ball 0.1～3.0kg/ ton steel, is continuously added to 1～3 batch；
4) when vacuum indoor carbon content reaches 800～900ppm, forward automatic vacuum to, vacuum chamber pressure is controlled
0.2±0.01kPa；
5) when vacuum reaches 0.2 ± 0.01kPa, starting to reduce top gun oxygen blast, initial rifle position sets 6.5～8.5m,
Every oxygen blast 50～200Nm3, reduce rifle position 0.1～0.2m, be finally reduced to minimum rifle position；
6) oxygen blast early stage lift gas flow-control is 500～600Nl/min, and the lift gas flow-control of oxygen blast later stage exists
600～800Nl/min；
7) when in steel dissolved oxygen reach >=100ppm time, in steel, carbon reaches below 100ppm, stops oxygen blast；
8) circulation terminates to add 1.30～1.80kg aluminum steel sections/ton steel-deoxidizing, and non-uniform components 3min can break sky and take out of.
A kind of RH compound decarburization method the most according to claim 1, it is characterised in that described containing Fe2O3Solid
The Fe of ball2O3Content mass percent >=90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482607.3A CN103572004B (en) | 2013-10-14 | 2013-10-14 | RH composite decarburization method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310482607.3A CN103572004B (en) | 2013-10-14 | 2013-10-14 | RH composite decarburization method |
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| CN103572004A CN103572004A (en) | 2014-02-12 |
| CN103572004B true CN103572004B (en) | 2016-09-07 |
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| CN201310482607.3A Active CN103572004B (en) | 2013-10-14 | 2013-10-14 | RH composite decarburization method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108148945B (en) * | 2017-09-28 | 2019-05-31 | 钢铁研究总院 | A kind of blowing process that RH refining furnace second-time burning efficiency can be improved |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146502A (en) * | 2010-02-05 | 2011-08-10 | 鞍钢股份有限公司 | RH pure steel smelting and deep decarburization process |
| CN102851454A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for rapid deep decarburization in RH refining process |
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2013
- 2013-10-14 CN CN201310482607.3A patent/CN103572004B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102146502A (en) * | 2010-02-05 | 2011-08-10 | 鞍钢股份有限公司 | RH pure steel smelting and deep decarburization process |
| CN102851454A (en) * | 2011-06-29 | 2013-01-02 | 鞍钢股份有限公司 | Method for rapid deep decarburization in RH refining process |
Non-Patent Citations (1)
| Title |
|---|
| RH循环真空除气法的新技术;张鉴;《炼钢》;19960430;第32-48页、第52页 * |
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| CN103572004A (en) | 2014-02-12 |
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