CN105986053A - Industrial pure iron production method - Google Patents
Industrial pure iron production method Download PDFInfo
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- CN105986053A CN105986053A CN201510079814.3A CN201510079814A CN105986053A CN 105986053 A CN105986053 A CN 105986053A CN 201510079814 A CN201510079814 A CN 201510079814A CN 105986053 A CN105986053 A CN 105986053A
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Abstract
The invention relates to an industrial pure iron production method which comprises the following production steps of oxygen converter smelting, LF refining, molten steel slag removal, LF refining, RH refining, and casting, wherein in the step of oxygen converter smelting, molten iron containing less than or equal to 0.001% of S is adopted, total iron smelting is carried out, the tapping temperature is controlled at 1670-1690 degrees, an oxygen value is controlled at 600-900ppm, terminal C is controlled below 0.04%, P is controlled below 0.015%, and boiling tapping is carried out; in the step of LF refining, lime and fluorite are adopted for slag making and dephosphorization, after slag removal, aluminium wire sections and lime are added for making reducing slag for desulfurization, and top slag FeO+MnO is controlled below 1.5%. The industrial pure iron production method has the advantages that an oxygen converter adopts molten iron containing ultralow S content for total iron smelting, so that the content of residual elements of steel is effectively controlled; at the terminal of the oxygen converter, high temperature, high oxygen and low carbon boiling tapping is realized, so that the effects of external refining dephosphorization and decarburization are ensured; and by adopting an oxygen converter and external refining smelting technology, the cost of pure iron is relatively low.
Description
Technical field
The present invention relates to a kind of production ingot iron method, particularly relate to a kind of employing oxygen coverter+furnace outer refining process and produce
The method of ingot iron.
Background technology
Ingot iron is a kind of important iron and steel basic material, is mainly used in smelting various high temperature alloy, heat-resisting alloy, precision
The Aero-Space such as alloy, Maraging steel, military project and civilian alloy or steel, the most at home and abroad undergo an unusual development swift and violent.
But limited by the super purity that ingot iron is strict, the most only can at Special Steel Works use electric arc furnace, vaccum sensitive stove etc.
Carrying out the smelting of ingot iron, its manufacturing process itself needs to use pure steel scrap, and its manufacturing process is complicated simultaneously, price is high
Expensive.
Summary of the invention
For overcoming the deficiencies in the prior art, it is an object of the invention to provide a kind of ingot iron method that produces, employing oxygen coverter
+ furnace outer refining process produces pure iron, the smelting process of the ingot iron that breaks traditions and limiting element, promotes that ingot iron produces
Development the most faster.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of produce ingot iron method, comprise the following production steps that oxygen coverter-LF refine-molten steel is skimmed-LF essence
Refining-RH refine-cast；
1) oxygen coverter uses the molten iron of S≤0.001%, and full ferrum is smelted, and smelting process adds Calx；Tapping temperature controls
1670-1690 DEG C, oxygen value controls at 600-900ppm, and terminal C controls at 0 ＜ C≤0.04%, P control 0 ＜ P≤
0.015%, boiling tapping；
2) refine of LF stove uses white lime and fluorite to carry out slag making and take off P, and before skimming, P controls at 0 ＜ P≤0.002%；Through skimming
After, adding aluminum steel section and white lime is made reducing slag and taken off S, take out of S and control at 0 ＜ S≤0.001%, top slag FeO+MnO controls
At 0 ＜ (FeO+MnO)≤1.5%；
3) RH refine, takes out of C, Als composition according to LF stove and determines that decarburization blowing oxygen quantity, decarburization terminal C control at 0 ＜ C
≤ 0.001%, then carry out calm deoxidation, and reduce T [O] content in steel by circulation+weak two ways of blowing, reach 0 ＜
T[O]≤20ppm。
Step 3) described in decarburization blowing oxygen quantity computing formula:
Decarburization blowing oxygen quantity (m3)={ Als (ppm)+0.75 × [C] (ppm)+350} × 0.3.
Step 3) described in circulation+weak mode of blowing be: during circulating deoxidation, argon blowing rate controls at 115-125Nm3/ h, time
Between control at 8-12min；During weak stripping oxygen, argon blowing rate controls at 15-25 Nm3/ h, the time controls at 10-15min.
Compared with prior art, the invention has the beneficial effects as follows:
Converter uses ultralow S molten iron to carry out full ferrum smelting, effectively controls steel grade residual element content.Converter terminal high temperature hyperoxia
Low carbon boil is tapped, it is ensured that external refining takes off P, de-C effect.Use oxygen coverter+furnace outer refining process smelting process pure
Ferrum relative low price, according to the current market price, ton steel can reduce cost 500-1000 unit.
Detailed description of the invention
Below the present invention is described in detail, it should be noted that the enforcement of the present invention is not limited to following embodiment.
A kind of produce ingot iron method, comprise the following production steps that oxygen coverter-LF refine-molten steel is skimmed-LF essence
Refining-RH refine-cast；
1) oxygen coverter uses the molten iron of S≤0.001%, and full ferrum is smelted, and smelting process adds Calx；Tapping temperature controls
1670-1690 DEG C, oxygen value controls at 600-900ppm, and terminal C controls at 0 ＜ C≤0.04%, P control 0 ＜ P≤
0.015%, boiling tapping；
2) refine of LF stove uses white lime and fluorite to carry out slag making and take off P, and before skimming, P controls at 0 ＜ P≤0.002%；Through skimming
After, adding aluminum steel section and white lime is made reducing slag and taken off S, take out of S and control at 0 ＜ S≤0.001%, top slag FeO+MnO controls
At 0 ＜ (FeO+MnO)≤1.5%；
3) RH refine, takes out of C, Als composition according to LF stove and determines that decarburization blowing oxygen quantity, decarburization terminal C control at 0 ＜ C
≤ 0.001%, then carry out calm deoxidation, and reduce T [O] content in steel by circulation+weak two ways of blowing, reach 0 ＜
T[O]≤20ppm。
Step 3) described in decarburization blowing oxygen quantity computing formula:
Decarburization blowing oxygen quantity (m3)={ Als (ppm)+0.75 × [C] (ppm)+350} × 0.3.
Step 3) described in circulation+weak mode of blowing be: during circulating deoxidation, argon blowing rate controls at 115-125Nm3/ h, time
Between control at 8-12min；During weak stripping oxygen, argon blowing rate controls at 15-25 Nm3/ h, the time controls at 10-15min.
Embodiment 1:
A kind of produce ingot iron method, comprise the following production steps that oxygen coverter-LF refine-molten steel is skimmed-LF essence
Refining-RH refine-cast；
1) oxygen coverter uses the molten iron of S≤0.001%, and full ferrum is smelted, and smelting process adds Calx 45Kg/ ton steel；Tapping
Temperature controls at 1680 DEG C, and oxygen value controls at 800ppm, and terminal C controls 0.035%, and P controls 0.013%, boiling
Tapping；
2) refine of LF stove uses white lime and fluorite to carry out slag making and take off P, and before skimming, P controls 0.0015%；After skimming,
Add aluminum steel section 2.5Kg/ ton steel, white lime 15Kg/ ton steel is made reducing slag and is taken off S, takes out of S and controls 0.0009%, pushes up slag
FeO+MnO controls 1.4%；
3) RH refine, takes out of C, Als composition according to LF stove and determines decarburization blowing oxygen quantity, { blowing oxygen quantity (m3)=[Als (ppm)
+ 0.75 × [C] (ppm)+350] × 0.3}, decarburization terminal C controls below 0.001%, then carries out calm deoxidation,
And blow two ways by circulation+weak and reduce T [O] content in steel (during circulating deoxidation, argon blowing rate controls at 120Nm3/ h,
Time controls at 10min；During weak stripping oxygen, argon blowing rate controls at 18Nm3/ h, the time controls at 10min, and RH takes out of
T [O] content is reduced to 15ppm.
By above production technology, it is achieved C≤0.005%, Si≤0.02%, P≤0.005%, S≤0.003%, T [O]≤
0.003% stability contorting, residual elements meet ingot iron standard-required.
Claims (3)
1. one kind produce ingot iron method, it is characterised in that comprise the following production steps that oxygen coverter-LF refine-
Molten steel is skimmed-LF refine-RH refine-cast；
1) oxygen coverter uses the molten iron of S≤0.001%, and full ferrum is smelted, and smelting process adds Calx；Tapping temperature controls
1670-1690 DEG C, oxygen value controls at 600-900ppm, and terminal C controls at 0 ＜ C≤0.04%, P control 0 ＜ P≤
0.015%, boiling tapping；
2) refine of LF stove uses white lime and fluorite to carry out slag making and take off P, and before skimming, P controls at 0 ＜ P≤0.002%；Through skimming
After, adding aluminum steel section and white lime is made reducing slag and taken off S, take out of S and control at 0 ＜ S≤0.001%, top slag FeO+MnO controls
At 0 ＜ (FeO+MnO)≤1.5%；
3) RH refine, takes out of C, Als composition according to LF stove and determines that decarburization blowing oxygen quantity, decarburization terminal C control at 0 ＜ C
≤ 0.001%, then carry out calm deoxidation, and reduce T [O] content in steel by circulation+weak two ways of blowing, reach 0 ＜
T[O]≤20ppm。
The most according to claim 1 a kind of produce ingot iron method, it is characterised in that step 3) described in de-
Carbon blowing oxygen quantity computing formula:
Decarburization blowing oxygen quantity (m3)={ Als (ppm)+0.75 × [C] (ppm)+350} × 0.3.
The most according to claim 1 a kind of produce ingot iron method, it is characterised in that step 3) described in follow
Ring+weak mode of blowing is: during circulating deoxidation, argon blowing rate controls at 115-125Nm3/ h, the time controls at 8-12min；Weak blow
During deoxidation, argon blowing rate controls at 15-25Nm3/ h, the time controls at 10-15min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510079814.3A CN105986053A (en) | 2015-02-13 | 2015-02-13 | Industrial pure iron production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510079814.3A CN105986053A (en) | 2015-02-13 | 2015-02-13 | Industrial pure iron production method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350631A (en) * | 2016-09-30 | 2017-01-25 | 首钢总公司 | Production method of armco iron for amorphous soft magnetic materials |
| CN108277316A (en) * | 2017-01-05 | 2018-07-13 | 鞍钢股份有限公司 | A kind of production method of pure iron |
| CN108559905A (en) * | 2018-03-09 | 2018-09-21 | 邢台钢铁有限责任公司 | High amorphized silicon pure iron as raw material and its production method |
| CN109852761A (en) * | 2019-03-07 | 2019-06-07 | 包头钢铁（集团）有限责任公司 | A kind of production method of ingot iron |
| CN110629118A (en) * | 2019-10-29 | 2019-12-31 | 成都先进金属材料产业技术研究院有限公司 | Medium-low carbon industrial ultra-pure iron and production method thereof |
| CN113774285A (en) * | 2020-06-10 | 2021-12-10 | 宝武特种冶金有限公司 | Ultra-low carbon industrial pure iron and preparation method thereof |
| CN115044820A (en) * | 2022-05-30 | 2022-09-13 | 鞍钢股份有限公司 | Smelting method of ultra-low carbon and ultra-low sulfur pure iron |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350631A (en) * | 2016-09-30 | 2017-01-25 | 首钢总公司 | Production method of armco iron for amorphous soft magnetic materials |
| CN108277316A (en) * | 2017-01-05 | 2018-07-13 | 鞍钢股份有限公司 | A kind of production method of pure iron |
| CN108277316B (en) * | 2017-01-05 | 2020-01-07 | 鞍钢股份有限公司 | Production method of pure iron |
| CN108559905A (en) * | 2018-03-09 | 2018-09-21 | 邢台钢铁有限责任公司 | High amorphized silicon pure iron as raw material and its production method |
| CN109852761A (en) * | 2019-03-07 | 2019-06-07 | 包头钢铁（集团）有限责任公司 | A kind of production method of ingot iron |
| CN110629118A (en) * | 2019-10-29 | 2019-12-31 | 成都先进金属材料产业技术研究院有限公司 | Medium-low carbon industrial ultra-pure iron and production method thereof |
| CN113774285A (en) * | 2020-06-10 | 2021-12-10 | 宝武特种冶金有限公司 | Ultra-low carbon industrial pure iron and preparation method thereof |
| CN115044820A (en) * | 2022-05-30 | 2022-09-13 | 鞍钢股份有限公司 | Smelting method of ultra-low carbon and ultra-low sulfur pure iron |
| CN115044820B (en) * | 2022-05-30 | 2023-09-26 | 鞍钢股份有限公司 | Smelting method of ultralow-carbon ultralow-sulfur pure iron |
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