CN102827989A - Production method of low-carbon high-chromium steel - Google Patents
Production method of low-carbon high-chromium steel Download PDFInfo
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- CN102827989A CN102827989A CN2012103576983A CN201210357698A CN102827989A CN 102827989 A CN102827989 A CN 102827989A CN 2012103576983 A CN2012103576983 A CN 2012103576983A CN 201210357698 A CN201210357698 A CN 201210357698A CN 102827989 A CN102827989 A CN 102827989A
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- steel
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- chromium
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 48
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000011651 chromium Substances 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 5
- 239000010436 fluorite Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- -1 be heated to 1600 °C Substances 0.000 claims description 2
- 238000005261 decarburization Methods 0.000 abstract description 3
- 239000002912 waste gas Substances 0.000 abstract 1
- 238000003723 Smelting Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a production method of low-carbon high-chromium steel, wherein the carbon content of converter tapping is controlled to be 0.15-0.25wt%, the tapping temperature is 1660-; the RH furnace adopts high lance position manual pressure control, the lance position and the oxygen flow are dynamically adjusted at any time according to the carbon content in steel, and the waste gas flow is controlled to be less than or equal to 3000Nm3Step-type pressure reduction is adopted, the liquid level of the molten steel in the vacuum chamber is always controlled below the boundary line of the bottom groove and the middle groove, when the RH furnace is used for light treatment to reduce the carbon content in the steel to 0.10wt%, the pressure is adjusted, and the oxygen lance is operated at a low lance position to reduce the lance position to the optimal decarburization position; and adding fluorite and aluminum powder into the LF furnace, and reducing chromium in the slag. The invention can reduce the carbon content to be less than 0.01 percent and the chromium content to be more than or equal to 5 percent, thereby realizing the production of the qualified low-carbon high-chromium steel with pure steel quality by the RH furnace.
Description
Technical field
The invention belongs to the process for making technical field, relate in particular to the method for a kind of employing converter-vacuum degassing furnace (RH stove)-ladle refining furnace (LF stove) explained hereafter low-carbon (LC) high chromium steel.
Background technology
So-called low-carbon (LC) high chromium steel is meant the one type of steel grade that contains C≤0.01%, Cr>=5% in the steel.At present, the ultra low-carbon steel of Cr content in the converter smelting steel >=5 wt% need add high carbon ferro-chrome in converter, and for guaranteeing the yield of chromium, tapping carbon requires more than 0.2%.Because carbon content is higher in the steel, therefore be not adopt the RH stove to handle mostly, but through vacuum degassing furnace (VOD stove) process for producing Ultra-low carbon high chromium steel, so domestic special steel factory adopts the VOD stove to produce the low-carbon (LC) high chromium steel.
Domestic RH stove for the security that guarantees to produce, requires stove C≤0.10% when producing soft steel, at present still useless RH stove is produced the precedent of high carbon steel.And in the production practice according to metal active, owing in the steel when having chromium to exist, will suppress the rapid reaction of carbon; Reaction is controlled when making the decarburization of RH stove; Therefore, for the general steel mill with RH stove, exploitation RH stove is handled the low-carbon (LC) high chromium steel and is had more vast market prospect and economic worth.
Summary of the invention
The object of the invention aims to provide a kind of method of producing the low-carbon (LC) high chromium steel, through converter smelting control carbon content, yield of alloy behind the raising stove; Handle through RH stove carbon drop, carbon content is reduced to below 0.01%; Make white slag reduction increasing chromium through LF furnace roof slag upgrading again, thereby realize the purified qualified low-carbon (LC) high chromium steel of RH stove production steel.
For this reason, the solution that the present invention taked is:
A kind of working method of low-carbon (LC) high chromium steel, the production process route of employing converter-RH stove-LF stove, its concrete grammar is:
1, the converter tapping carbon content is controlled at 0.20-0.25wt%, and tapping temperature 1660-1670 ℃, take half calm tapping, the tapping back adds the quickened lime granule according to the ratio of steel 1.2-3kg per ton;
2, RH gently handles: the RH stove adopts the Manual pressure control of high rifle position, dynamically adjusts rifle position, oxygen flow and pressure at any time according to the variation of carbon content in the steel, and exhaust gas flow is controlled at≤2000Nm
3/ h, liquid steel level is controlled at base channel and below the [line line of delimitation all the time in the Vakuumkammer; Concrete corresponding relation according to carbon content adjustment rifle position, oxygen flow, pressure is:
| Carbon content wt% | Rifle position m | Oxygen flow Nm 3/h | Pressure kPa |
| C≥0.20 | 6.9-7.3 | 770-880 | 40-50 |
| 0.20＜C≥0.15 | 6.7-6.9 | 890-1030 | 30-39 |
| 0.15＜C≥0.12 | 6.4-6.6 | 1040-1090 | 20-29 |
| 0.12＜C≥0.10 | 6-6.3 | 1100 | 15-19 |
3, RH depths reason: begin to adjust pressure when carbon content is reduced to 0.10wt% in the RH stove is gently handled steel, get into the dark vacuum-oxygen decarbonizing stage, with the rifle potential drop to 5.8-6m;
4, the reduction of LF stove is handled: go into LF stove steel per ton and add the 3-3.5kg fluorite, be heated to 1600 ℃, steel per ton then adds the chromium in 4 ~ 5kg aluminum reduction slag.
Beneficial effect of the present invention is:
The present invention can be controlled at 0.15-0.25% with carbon content through converter smelting, yield of alloy behind the raising stove; After the processing of RH stove carbon drop, carbon content is reduced to below 0.01%; Make white slag reduction through LF furnace roof slag upgrading again and increase chromium, in the steel chromium content can reach >=5%, thereby realize that the RH stove produces the purified qualified low-carbon (LC) high chromium steel of steel.
Embodiment
Be example with 100 tons of converters, production SUS410 steel grade below, the present invention is described further.
Embodiment 1:
1, the converter tapping carbon content is controlled at 0.20wt%, and tapping temperature is controlled at 1660 ℃, takes half calm tapping, and the tapping back adds quickened lime granule 120kg.
2, RH gently handles: the RH stove adopts the control of high rifle position Manual pressure, according to carbon content 0.20wt% with the rifle position be controlled at 7 m, oxygen flow is 800 Nm
3/ h, exhaust gas flow is controlled at 1500Nm
3/ h, liquid steel level is controlled at base channel and below the [line line of delimitation all the time in the Vakuumkammer.Then, adjust oxygen lance position, oxygen flow and pressure at any time according to the variation of carbon content in the molten steel, concrete corresponding relation is:
| Carbon content wt% | Rifle position m | Oxygen flow Nm 3/h | Pressure kPa |
| 0.20＜C≥0.15 | 6.7-6.9 | 890-1030 | 30-39 |
| 0.15＜C≥0.12 | 6.4-6.6 | 1040-1090 | 20-29 |
| 0.12＜C≥0.10 | 6-6.3 | 1100 | 15-19 |
3, RH depths reason: when carbon content is reduced to 0.10wt% in the RH stove gently is handled steel, pressure is adjusted to 67Pa, get into the dark vacuum-oxygen decarbonizing stage, the rifle bit manipulation is hanged down in the employing of oxygen rifle, with the rifle potential drop to 6m.
4, the reduction of LF stove is handled: go into the LF stove and add the 300kg fluorite, be heated to 1600 ℃, add the chromium in the 500kg aluminum reduction slag then.
Embodiment 2:
1, the converter tapping carbon content is controlled at 0.24wt%, and tapping temperature is controlled at 1670 ℃, takes half calm tapping, and the tapping back adds quickened lime granule 300kg.
2, RH gently handles: the RH stove adopts the Manual pressure control of high rifle position, and exhaust gas flow is controlled at 2000Nm
3/ h takes staged step-down mode, and liquid steel level is controlled at base channel and below the [line line of delimitation all the time in the Vakuumkammer, and adjusts rifle position, oxygen blast flow and pressure at any time according to the variation of carbon content in the RH stove.
The concrete corresponding relation of carbon content and rifle position, oxygen blast flow and pressure adjustment is:
| Carbon content wt% | Rifle position m | Oxygen flow Nm 3/h | Pressure kPa |
| C≥0.20 | 6.9-7.3 | 770-880 | 40-50 |
| 0.20＜C≥0.15 | 6.7-6.9 | 890-1030 | 30-39 |
| 0.15＜C≥0.12 | 6.4-6.6 | 1040-1090 | 20-29 |
| 0.12＜C≥0.10 | 6-6.3 | 1100 | 15-19 |
3, RH depths reason: when carbon content is reduced to 0.10wt% in the RH stove is gently handled steel, pressure is adjusted to 75 Pa, get into the dark vacuum-oxygen decarbonizing stage, the oxygen rifle adopts low rifle bit manipulation, with rifle potential drop to 5.8 m, makes it be in the decarburization optimum position.
4, the reduction of LF stove is handled: go into the LF stove and add the 350kg fluorite, be heated to 1600 ℃, add the chromium in the 400kg aluminum reduction slag then.
Claims (1)
1. the working method of a low-carbon (LC) high chromium steel adopts the production process route of converter-RH stove-LF stove, it is characterized in that:
(1), the converter tapping carbon content is controlled at 0.20-0.25wt%, tapping temperature 1660-1670 ℃, take half calm tapping, the tapping back adds the quickened lime granule according to the ratio of steel 1.2-3kg per ton;
(2), RH gently handles: the RH stove adopts the Manual pressure control of high rifle position, dynamically adjusts rifle position, oxygen flow and pressure at any time according to the variation of carbon content in the steel, and exhaust gas flow is controlled at≤2000Nm
3/ h, liquid steel level is controlled at base channel and below the [line line of delimitation all the time in the Vakuumkammer; Concrete corresponding relation according to carbon content adjustment rifle position, oxygen flow, pressure is:
(3), RH depths reason: begin to adjust pressure when carbon content is reduced to 0.10wt% in the RH stove is gently handled steel, get into the dark vacuum-oxygen decarbonizing stage, with the rifle potential drop to 5.8-6m;
(4), the reduction of LF stove is handled: go into LF stove steel per ton and add the 3-3.5kg fluorite, be heated to 1600 ℃, steel per ton then adds the chromium in 4 ~ 5kg aluminum reduction slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103576983A CN102827989B (en) | 2012-09-25 | 2012-09-25 | Production method of low-carbon high-chromium steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103576983A CN102827989B (en) | 2012-09-25 | 2012-09-25 | Production method of low-carbon high-chromium steel |
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| Publication Number | Publication Date |
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| CN102827989A true CN102827989A (en) | 2012-12-19 |
| CN102827989B CN102827989B (en) | 2013-09-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908056A (en) * | 2016-06-17 | 2016-08-31 | 辽宁科技大学 | Smelting method of low-carbon low-nitrogen high-chrome steel |
| CN106148641A (en) * | 2016-08-25 | 2016-11-23 | 江苏省沙钢钢铁研究院有限公司 | RH decarburization method of ultra-low carbon high chromium corrosion-resistant steel |
| CN106544468A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | Production method of low-carbon high-manganese steel |
| CN107272769A (en) * | 2017-08-02 | 2017-10-20 | 合肥四书电子商务有限公司 | A kind of metallurgical furnace temperature control system |
| CN110484691A (en) * | 2019-07-30 | 2019-11-22 | 江苏省沙钢钢铁研究院有限公司 | A kind of RH vacuum drying oven change rifle position variable-flow decarburization and cr yield method |
| CN114000047A (en) * | 2021-09-28 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Low-carbon high-chromium steel plate blank and continuous efficient production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4474605A (en) * | 1981-03-03 | 1984-10-02 | Sumitomo Metal Industries, Ltd. | Process for refining high-chromium steels |
| CN101768656A (en) * | 2008-12-31 | 2010-07-07 | 宝山钢铁股份有限公司 | Method for refining ultra-low carbon ferritic stainless steel under vacuum |
-
2012
- 2012-09-25 CN CN2012103576983A patent/CN102827989B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4474605A (en) * | 1981-03-03 | 1984-10-02 | Sumitomo Metal Industries, Ltd. | Process for refining high-chromium steels |
| CN101768656A (en) * | 2008-12-31 | 2010-07-07 | 宝山钢铁股份有限公司 | Method for refining ultra-low carbon ferritic stainless steel under vacuum |
Non-Patent Citations (1)
| Title |
|---|
| 姚志超等: "GCr15轴承钢转炉冶炼工艺的研究", 《钢铁研究》, vol. 37, no. 3, 30 June 2009 (2009-06-30), pages 45 - 47 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106544468A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | Production method of low-carbon high-manganese steel |
| CN105908056A (en) * | 2016-06-17 | 2016-08-31 | 辽宁科技大学 | Smelting method of low-carbon low-nitrogen high-chrome steel |
| CN106148641A (en) * | 2016-08-25 | 2016-11-23 | 江苏省沙钢钢铁研究院有限公司 | RH decarburization method of ultra-low carbon high chromium corrosion-resistant steel |
| CN106148641B (en) * | 2016-08-25 | 2018-03-16 | 江苏省沙钢钢铁研究院有限公司 | RH decarburization method of ultra-low carbon high chromium corrosion-resistant steel |
| CN107272769A (en) * | 2017-08-02 | 2017-10-20 | 合肥四书电子商务有限公司 | A kind of metallurgical furnace temperature control system |
| CN110484691A (en) * | 2019-07-30 | 2019-11-22 | 江苏省沙钢钢铁研究院有限公司 | A kind of RH vacuum drying oven change rifle position variable-flow decarburization and cr yield method |
| CN114000047A (en) * | 2021-09-28 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Low-carbon high-chromium steel plate blank and continuous efficient production method thereof |
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| CN102827989B (en) | 2013-09-04 |
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