CN103614517B - Low-cost deoxidation method for low-aluminum medium-carbon steel - Google Patents
Low-cost deoxidation method for low-aluminum medium-carbon steel Download PDFInfo
- Publication number
- CN103614517B CN103614517B CN201310582160.7A CN201310582160A CN103614517B CN 103614517 B CN103614517 B CN 103614517B CN 201310582160 A CN201310582160 A CN 201310582160A CN 103614517 B CN103614517 B CN 103614517B
- Authority
- CN
- China
- Prior art keywords
- steel
- aluminum
- deoxidation
- converter
- tapping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910000954 Medium-carbon steel Inorganic materials 0.000 title claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 77
- 239000010959 steel Substances 0.000 claims abstract description 77
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000010079 rubber tapping Methods 0.000 claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 238000007670 refining Methods 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000011572 manganese Substances 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000010703 silicon Substances 0.000 claims abstract description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005275 alloying Methods 0.000 claims abstract description 5
- 239000004411 aluminium Substances 0.000 claims description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 238000006392 deoxygenation reaction Methods 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 6
- 241001417490 Sillaginidae Species 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 4
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 3
- 229910001021 Ferroalloy Inorganic materials 0.000 abstract 2
- 238000007664 blowing Methods 0.000 abstract 2
- 239000012535 impurity Substances 0.000 abstract 1
- 238000005272 metallurgy Methods 0.000 abstract 1
- 239000002436 steel type Substances 0.000 abstract 1
- 238000009749 continuous casting Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 8
- 235000011941 Tilia x europaea Nutrition 0.000 description 8
- 239000004571 lime Substances 0.000 description 8
- 239000002893 slag Substances 0.000 description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000720 Silicomanganese Inorganic materials 0.000 description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 4
- 239000010436 fluorite Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a low-cost deoxidation method for low-aluminum medium carbon steel, belonging to the technical field of metallurgy. The method comprises the following specific process steps: 1) in the converter blowing process, controlling the carbon content at the blowing end point to be more than 0.08 percent and controlling the oxygen content of molten steel at the end point to be less than 0.04 percent; 2) adding ferroalloy of silicon and manganese and aluminum for deoxidation alloying during converter tapping, wherein the addition amount of the aluminum is 0.3-1 kg/t of steel, and the addition amount of the ferroalloy of silicon and manganese meets the requirements of steel types; 3) and after tapping, transferring to an LF refining station, feeding 0-1.5 m/t of steel by an aluminum wire at one time according to the deoxidation condition of molten steel, finely adjusting components and removing impurities in the refining process, and controlling the aluminum content at the LF end point within 0.015%. The method has the advantages that: the end point carbon content of the converter is improved, and the amount of aluminum for deoxidation is reduced; a small amount of aluminum is added for weak deoxidation during tapping, the aluminum content of molten steel at the refining end is lower, and the consumption of aluminum for deoxidation is reduced.
Description
Technical field
The present invention relates to a kind of Low-cost deoxygenation method of low aluminium medium carbon steel, belong to metallurgical technology field.
Background technology
Steel industry situation is increasingly serious, and China's steel industry just progressively enters the competition developmental stage of a high cost, low profit.The improvement and bring new ideas of Technology is the important means improving iron and steel enterprise's competitive power, and its final purpose reduces production cost, improves product profit space.
Q235 steel series is common carbon structural steel, and the Production Flow Chart that such steel grade is conventional is " molten iron pre-desulfurization-converter smelting-LF refining-continuous casting ".Converter smelting low-carbon (LC) is tapped, and the oxygen gesture of molten steel is higher, adds enough Al ingots and carries out deep deoxidation, carry out the alloying of Si, Mn, C simultaneously in tapping process, and Al and the fine setting of other alloy are mended in refining afterwards.The shortcoming of this technique is: (1) converter low-carbon (LC) is tapped, the easy peroxidation of molten steel, increases blow loss rate, causes steel technology high; (2) add enough Al and carry out deep deoxidation during tapping, the density due to Al is less than molten steel density, floats over molten steel surface easily, and the oxygen in part Al and air reacts, and the consumption of Al is larger, and burn out rate is higher, causes the consumption of deoxidation Al larger.These reasons cause the production cost of such steel grade higher.If optimize the deoxidization technique of such steel grade, its production cost can be reduced, improve its profit space.
Chinese Patent Application No. a kind of electric furnace steel tapping three step deoxidization technique that has been the patent disclosure of 200710031301.0, use carbon dust pre-deoxidation in tapping early stage, and tapping mid-term, the later stage of tapping used aluminium deep deoxidation with the shallow deoxidation of ferrosilicon.The method uses cheap carbon dust, the aluminium of ferrosilicon Some substitute costliness carries out deoxidation, can reduce the consumption of aluminium, reduce production cost.Chinese Patent Application No. is the 201110283535.0 a kind of methods disclosing middle carbon Aluminum steel convertor deacidification, converter low-carbon (LC) is tapped, carbonaceous material pre-deoxidation is first added when tap is 1/6 of tap, after carbonaceous material adds, add Al alloy when tap is 40% ~ 70% and Si, Mn iron alloy carries out deep deoxidation and alloying.The common ground of above-mentioned technique is that the carbon content of tapping in front molten steel is lower, and the oxygen gesture of molten steel is higher, and tapping carbonaceous material in early stage carries out pre-deoxidation, can reduce the consumption of deoxidation Al.The shortcoming that these technique exists is: (1) converter or the tapping of electric furnace low-carbon (LC), and blow loss rate is high, increases the consumption of iron and steel stock; The oxygen gesture of tapping molten steel is higher, increases the consumption of reductor; (2) use carbonaceous material pre-deoxidation can produce a large amount of CO gas, cause molten steel to seethe with excitement, easily occur security incidents such as " turning over bag ".In addition, the CO gas of generation is not easy to collect, and there is certain potential safety hazard.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of Low-cost deoxygenation method of low aluminium medium carbon steel, by improving endpoint carbon content of converter, reducing terminal oxygen level, adopt the two step deoxidization techniques of " tapping adds the weak deoxidation of aluminium+LF and mends aluminium final deoxygenation ", the aluminium content of refining endpoint molten steel is controlled within 0.015%, effectively can reduce the consumption of aluminium alloy class reductor, thus reduce deoxidation cost.
For solving the problems of the technologies described above, the invention provides a kind of Low-cost deoxygenation method of low aluminium medium carbon steel, technique comprises the following steps:
(1) molten iron is after pre-desulfurization process, is blended into converter and smelts, and controls carbon content >=0.08% of converter smelting endpoint, reduces endpoint molten steel oxygen level to≤0.04%;
(2), in converter tapping process, add silicon-containing alloy, carry out deoxidation alloying containing manganese alloy, appropriate aluminium alloy, the weak deoxidation of tapping process.The iron alloy add-on of silicon, manganese is pressed steel grade target component and determines, and the ton steel add-on of aluminium alloy is for containing between fine aluminium 0.3kg ~ 1kg;
(3) after converter tapping terminates, ladle allocation and transportation carry out secondary refining to LF refining station, mend hello aluminum steel carry out final deoxygenation to molten steel after LF arrives at a station according to the aluminium content of molten steel.The ton steel feed quantity of final deoxygenation aluminum steel is between 0m ~ 1.5m, and the linear density of aluminum steel is 0.1kg/m ~ 0.5kg/m.It is 0.002% ~ 0.015% that aluminium content after final deoxygenation in molten steel controls, total oxygen content≤0.004% in molten steel.
The invention has the advantages that, improve endpoint carbon content of converter, deoxydized steel use amount reduces; Tapping adds the weak deoxidation of a small amount of aluminium, decreases the scaling loss of aluminium, and molten steel amount of nitrogen sucking reduces; Aluminium content in refining endpoint molten steel is lower, decreases the consumption of aluminium.When the method being used for the production of Q235, the total oxygen content of LF refining endpoint molten steel, lower than 40ppm, meets this steel grade use properties to the requirement of oxygen level.
Embodiment
The present invention will be described below to enumerate specific embodiment.Embodiment, only for the invention will be further described, does not represent protection scope of the present invention, and the nonessential amendment that other people make according to the present invention and adjustment, still belong to protection scope of the present invention.
Embodiment 1
Object steel grade: Q235
Technical process: molten iron pre-desulfurization-converter smelting-LF refining-continuous casting
Molten iron, after pre-desulfurization process, is blended into converter and smelts, and smelting endpoint carbon content is 0.091%, oxygen level is 0.026%, and temperature is 1607 DEG C.Converter tapping quantity 180t, tap, to adding lime 440kg, fluorite 137kg pre-slag making during 30t, adds ferro-silicon 215kg, silicomanganese 526kg, aluminium ingot 87kg carries out component controlling.Tapping terminates rear allocation and transportation to LF ladle refining station, and mend and feed aluminum steel 50m, add lime 302kg slag making, add silicomanganese 100kg, add carburelant 105kg, refining was tapped after 26 minutes, and during tapping, the aluminium content of molten steel is 0.0132%, total oxygen content is 0.0024%.After tapping, allocation and transportation to continuous casting platform is poured into a mould.With former technics comparing, steel technology saves 3.8kg/t steel, and 0.47kg/t steel is saved in the consumption of aluminium.
Embodiment 2
Object steel grade: Q235
Technical process: molten iron pre-desulfurization-converter smelting-LF refining-continuous casting
Molten iron, after pre-desulfurization process, is blended into converter and smelts, and smelting endpoint carbon content is 0.113%, oxygen level is 0.023%, and temperature is 1617 DEG C.Converter tapping quantity 180t, tap, to adding lime 430kg, fluorite 136kg pre-slag making during 30t, adds ferro-silicon 264kg, silicomanganese 566kg, aluminium ingot 82kg carries out component controlling.Tapping terminates rear allocation and transportation to LF ladle refining station, and mend and feed aluminum steel 0m, add lime 262kg slag making, add carburelant 75kg, refining was tapped after 28 minutes, and during tapping, the aluminium content of molten steel is 0.0131%, total oxygen content is 0.003%.After tapping, allocation and transportation to continuous casting platform is poured into a mould.With former technics comparing, steel technology saves 4.2kg/t steel, and 0.49kg/t steel is saved in the consumption of aluminium.
Embodiment 3
Object steel grade: Q235
Technical process: molten iron pre-desulfurization-converter smelting-LF refining-continuous casting
Molten iron, after pre-desulfurization process, is blended into converter and smelts, and smelting endpoint carbon content is 0.093%, oxygen level is 0.031%, and temperature is 1616 DEG C.Converter tapping quantity 180t, tap, to adding lime 339kg, fluorite 96kg pre-slag making during 30t, adds ferro-silicon 256kg, silicomanganese 551kg, aluminium ingot 72kg, carburelant 61kg carries out component controlling.Tapping terminates rear allocation and transportation to LF ladle refining station, and mend and feed aluminum steel 50m, add lime 223kg slag making, add carburelant 30kg, refining was tapped after 26 minutes, and aluminium content during tapping in molten steel is 0.0081%, total oxygen content is 0.0035%.After tapping, allocation and transportation to continuous casting platform is poured into a mould.With former technics comparing, steel technology saves 2.5kg/t steel, and 0.55kg/t steel is saved in the consumption of aluminium.
Embodiment 4
Object steel grade: Q235
Technical process: molten iron pre-desulfurization-converter smelting-LF refining-continuous casting
Molten iron, after pre-desulfurization process, is blended into converter and smelts, and smelting endpoint carbon content is 0.088%, oxygen level is 0.032%, and temperature is 1617 DEG C.Converter tapping quantity 180t, tap, to adding lime 335kg, fluorite 109kg pre-slag making during 30t, adds ferro-silicon 255kg, silicomanganese 556kg, aluminium ingot 67kg, carburelant 62kg carries out component controlling.Tapping terminates rear allocation and transportation to LF ladle refining station, and mend and feed aluminum steel 100m, add lime 449kg slag making, add ferrosilicon 53kg, refining was tapped after 26 minutes, and aluminium content during tapping in molten steel is 0.0044%, total oxygen content is 0.0024%.After tapping, allocation and transportation to continuous casting platform is poured into a mould.With former technics comparing, steel technology saves 5.1kg/t steel, and 0.58kg/t steel is saved in the consumption of aluminium.
Claims (1)
1. a Low-cost deoxygenation method for low aluminium medium carbon steel, is characterized in that: processing step is as follows,
(1) molten iron is after pre-desulfurization process, is blended into converter and smelts, and controls the carbon content of smelting endpoint, reduces Oxygen Content in Liquid Steel during converter tapping, controls carbon content >=0.08% of converter smelting endpoint, reduces endpoint molten steel oxygen level≤0.04%;
(2), in converter tapping process, add silicon, the iron alloy of manganese and aluminium alloy and carry out deoxidation alloying, the iron alloy add-on of silicon, manganese is pressed steel grade target component and determines, the ton steel add-on of aluminium alloy for containing between fine aluminium 0.3 ~ 1kg, the weak deoxidation of tapping process;
(3) after converter tapping terminates, ladle allocation and transportation carry out secondary refining to LF refining station, mend hello aluminum steel according to the deoxidation situation of molten steel after LF arrives at a station and final deoxygenation is carried out to molten steel, the ton steel feed quantity of final deoxygenation aluminum steel is between 0 ~ 1.5m, the linear density of aluminum steel is 0.1 ~ 0.5kg/m, it is 0.002% ~ 0.015% that aluminium content after final deoxygenation in molten steel controls, total oxygen content≤0.004% in molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310582160.7A CN103614517B (en) | 2013-11-18 | 2013-11-18 | Low-cost deoxidation method for low-aluminum medium-carbon steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310582160.7A CN103614517B (en) | 2013-11-18 | 2013-11-18 | Low-cost deoxidation method for low-aluminum medium-carbon steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103614517A CN103614517A (en) | 2014-03-05 |
| CN103614517B true CN103614517B (en) | 2016-04-27 |
Family
ID=50165232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310582160.7A Active CN103614517B (en) | 2013-11-18 | 2013-11-18 | Low-cost deoxidation method for low-aluminum medium-carbon steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103614517B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104152631B (en) * | 2014-08-19 | 2016-01-27 | 马鞍山中科冶金材料科技有限公司 | A kind of material for deoxidation of molten steel, microalloying and preparation method and application method |
| CN107142355A (en) * | 2017-05-26 | 2017-09-08 | 攀钢集团攀枝花钢铁研究院有限公司 | One kind reduction converter semi-steel making deoxidation cost method |
| CN111235351A (en) * | 2020-01-14 | 2020-06-05 | 安阳钢铁股份有限公司 | Method for controlling oxygen content in molten steel |
| CN114182156A (en) * | 2020-09-14 | 2022-03-15 | 上海梅山钢铁股份有限公司 | Production method of low-aluminum carbon structural molten steel |
| CN113005258B (en) * | 2021-02-24 | 2022-04-12 | 广东韶钢松山股份有限公司 | Accident alloy disposal method |
| CN115261702B (en) * | 2021-04-29 | 2023-08-11 | 宝山钢铁股份有限公司 | Smelting method of hot-rolled spring steel and hot-rolled spring steel prepared by smelting method |
| CN114410890B (en) * | 2022-02-20 | 2023-05-26 | 山西太钢不锈钢股份有限公司 | Slag forming process of extremely-low aluminum railway rail steel |
| CN115418430B (en) * | 2022-07-17 | 2023-07-28 | 新疆八一钢铁股份有限公司 | Operation method for duplex smelting ladle cold steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597998A (en) * | 2003-09-17 | 2005-03-23 | 首钢总公司 | Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster |
| CN101020940A (en) * | 2007-03-28 | 2007-08-22 | 北京科技大学 | Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel |
-
2013
- 2013-11-18 CN CN201310582160.7A patent/CN103614517B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1597998A (en) * | 2003-09-17 | 2005-03-23 | 首钢总公司 | Process for producing steel containing alumium low carbon low ilicon by small square blank continuous caster |
| CN101020940A (en) * | 2007-03-28 | 2007-08-22 | 北京科技大学 | Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103614517A (en) | 2014-03-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103614517B (en) | Low-cost deoxidation method for low-aluminum medium-carbon steel | |
| CN103937926B (en) | Production method of ultra-low carbon steel and ultra-low oxygen content molten steel | |
| CN105907919B (en) | A kind of smelting process for spring steel Control and Inclusion Removal | |
| CN102787196B (en) | Method for smelting stainless steel by direct reduced iron | |
| CN102994871B (en) | Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron | |
| CN102168160B (en) | Converter steelmaking technology for directly reducing-alloying manganese ore | |
| CN102787195B (en) | Stainless-steel smelting method | |
| WO2018014752A1 (en) | Production process for dephosphorization outside of furnace of molten steel | |
| CN112680565B (en) | By using CO in AOD furnace2Method for smelting high-manganese stainless steel by decarburization | |
| CN105154623A (en) | Efficient alloying method for smelting 38CrMoAl steel | |
| CN107385139A (en) | A kind of smelting process of high-carbon steel | |
| CN105219913A (en) | A kind of method optimizing converter slag-making | |
| CN105420445A (en) | Method for smelting coarse-grained steel | |
| CN107058679B (en) | A method of stablizing half steel quality | |
| CN113981314B (en) | Non-refined 30MnSi steel and production method thereof | |
| CN107630167B (en) | A kind of production method of extremely low carbon high conductivity steel | |
| CN110565030A (en) | low-silicon low-aluminum martensitic stainless steel containing rare earth elements and smelting method thereof | |
| CN107502704B (en) | Method for reducing alumina inclusions in semisteel steelmaking casting blank | |
| CN104109727B (en) | The method of half steel converter smelting Low-phosphorus Steel | |
| CN106521082B (en) | A kind of production technology of high manganese high-aluminum steel continuous casting square billet | |
| CN104099443B (en) | CrMo steel waste material dephosphorization protects chromium smelting technology | |
| CN111411190B (en) | Production method for improving smelting efficiency of converter | |
| CN104946854B (en) | Steel smelting method | |
| CN110205434B (en) | Method for smelting steel bar with low cost | |
| CN103911480A (en) | Deoxidation production technology for smelting H08MnA steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |