CN1818094A - Steel liquid cleaner for steel smelting - Google Patents
Steel liquid cleaner for steel smelting Download PDFInfo
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- CN1818094A CN1818094A CN 200610065838 CN200610065838A CN1818094A CN 1818094 A CN1818094 A CN 1818094A CN 200610065838 CN200610065838 CN 200610065838 CN 200610065838 A CN200610065838 A CN 200610065838A CN 1818094 A CN1818094 A CN 1818094A
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- steel
- powder
- ferromanganese
- slag
- barium strontium
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Abstract
The invention is about the cleaned agent of the liquid steel. It is composed of the aluminous powder 30-70%, the magnesium powder 2-15%, the manganese iron powder 15-60% or the Si-Al-Ba-Sr-Ca-Mn-Fe slag powder 15-60%. The material is made to the agglomerant powder and press to model. It can reach the need of the deoxidate and the desulphurization. Also it can improve the percent recovery of the alloy. The invention can increase the clean degree of the liquid steel and improve the quality of the steel.
Description
Technical field
The present invention is a kind of molten steel purificant, belongs to field of steel-making, is used for deoxidation, desulfurization, alloying and the slag making of molten steel.
Background technology
Deoxidation to molten steel in steelmaking process is one of vital task, if deoxidation, desulfurization are not thorough, can cause cracking when rolling, is difficult to produce qualified product.In addition, when oxygen exists with the inclusion form, the mechanical property of steel is reduced.Traditional deoxidization technique: (1) bulk deoxidation method, aluminium ingot or composite deoxidant (Fe-Si-Al, Fe-Al-Mn etc.) are directly dropped into deoxidation in the stove, in deoxidation process, can generate a part of Al like this
2O
3, in molten steel, form dystectic aluminate, cause the influence of tap hole dross to produce easily, simultaneously because aluminium is that more valuable metal has improved steel-making cost.And use composite deoxidant aluminium and iron alloy remelting will need be had process cost, power consumption, fire consumption etc., than using its cost of aluminium deoxidation what do not reduce, in the secondary smelting process, also to cause the pollution of environment simultaneously; (2) diffusive deoxidation will add a large amount of various iron alloys in the steelmaking process, can produce the slag of some amount so again, and these slag major parts are oxide compounds, for improving the recovery rate of alloy, reduces slag oxidation [%O] reduced.Need directly to add in the slag, make X with deoxidation materials such as Al powder and Fe-Si powder
FeOReduce, do not stain molten steel.But its deoxidation dynamic conditions is poor, and deaeration time is long, influences the output of steel.Magnesium is the best element of deoxidation in steel making and desulfurization, contains the toughness that trace magnesium can strengthen steel in the steel simultaneously, but because its vapour pressure is big, can not directly use in molten steel.The applicant once developed Al-Mg-Fe alloy and obtained national patent (ZL01109847.3).Form alloy owing to magnesium is difficult with iron, the content of magnesium can surpass 5%, reach the requirement of steel-making, and production simultaneously is very difficult and dangerous, is difficult to promote the use of.
The polynary composite steel-smelting reductor of commonplace use in recent years--sial barium strontium calcium ferromanganese (quality standard sees Table 1) produces a large amount of slags when producing, because its fusing point height, viscosity are big, melt down utilization and can cause furnace bottom rising, influence the working of a furnace, therefore can only discard, cause the pollution of surrounding enviroment.Contain a large amount of oxide compounds and a spot of alloy ingredient in the slag, throwing away in vain, and it to be the steelmaking slagging good material be not utilized.
Table 1 sial barium strontium calcium ferromanganese quality standard (weight %)
| Element | Si | Al | Ba | Sr | Ca | Mn | Impurity ≯ | Fe | ||
| C | S | P | ||||||||
| Weight % | 45-50 | 8-10 | 12-15 | 5-7 | 5-7 | 8-10 | 0.5 | 0.04 | 0.04 | Surplus |
Summary of the invention
The purpose of this invention is to provide the lower molten steel purificant of price.Being used for deoxidation, desulfurization and slag making improves the rate of recovery of alloy, reaches the alloying requirement.On the basis that reduces steel-making cost, improve the purpose of steel product quality.
Molten steel purificant of the present invention is that the aluminium of deoxidation in steel making, desulfurization, magnesium and alloying ferromanganese and polynary composite steel-smelting reductor (sial barium strontium calcium ferromanganese) slag are made powder, with the compression moulding of tackiness agent (as the silicates tackiness agent) bonding.
The present invention is a kind of molten steel purificant that is used to make steel, and its composition weight % proportioning is:
Aluminium powder: 30-70% wherein contains Al 25-68% (make the used aluminium content of aluminium powder and press the GB3190-82 standard-required, also available secondary aluminum Al content 〉=80%);
Magnesium powder: 2-15% wherein contains Mg 2-15% (used magnesium is pressed the YB86-60 standard-required when making the magnesium powder);
Ferromanganese powder: 15-60% wherein contains Mn 10-45%, Fe 5-20% (make used low, middle carbon of ferromanganese powder and carbon element ferromanganese and press the YB59-65 standard-required, press the YB66-65 standard-required with blast furnace ferromanganese);
The polynary reductor pulverized slag of sial barium strontium calcium ferromanganese (the slag composition sees Table 2): 15-60%.
The contained composition of table 2 slag (weight %)
| Element | SiO 2 | Al 2O 3 | BaO | SrO | CaO | MnO | Impurity | FeO | ||
| C | S | P | ||||||||
| Weight % | 30- 60 | 2-12 | 5-12 | 1-5 | 1-5 | 2-6 | 0.5- 1.34 | 0.05- 6 | 0.05- 0.72 | Surplus |
The slag composition is comparatively complicated in the table 2, and major part is an oxide compound, and the alloy ingredient of the non-oxidized substance of 10-20% is still arranged.
Can choose wherein one or both full choosings wantonly in described ferromanganese powder and the sial barium strontium calcium ferromanganese pulverized slag, when selecting entirely for two kinds, described ferromanganese powder and sial barium strontium calcium ferromanganese pulverized slag respectively account for 50% among the raw material weight proportioning 15-60%.Ferromanganese powder and the choosing of sial barium strontium calcium ferromanganese powder be one or both full usefulness wherein, decide as required.If it is just can not use sial barium strontium calcium ferromanganese pulverized slag when producing low-silicon steel, siliceous higher because of it.
Preparation method of the present invention is with above-mentioned substance powder bonding, press forming with the silicates tackiness agent.
With above-mentioned raw materials selectable allotment ratio in specialized range as required.
Add molten steel purificant of the present invention during steel-making and combine the low-melting eutectic of generation with slag.Under the situation that has magnalium to participate in, very easily with the oxygen removal in the slag, restore useful steel-making alloying element, participate in the alloying of molten steel.Because multiple element coexistence interacts in participating in deoxidation, desulfurization and slagging process, can improve the ability of deoxidation, desulfurization and slag making, this meets deoxidation, desulphurization mechanism.
Production technique of the present invention
Above-mentioned required starting material are stirred with pressing machine extrusion molding, oven dry by certain fineness (0.01-5mm) allotment and silicates tackiness agent.
Intensity 〉=the 10-20MPa of this product, its proportion 4～6g/cm
3, fusing point 900-1100 ℃.
Embodiment
Embodiment 1: be used for the molten steel purificant of soft steel, its composition weight proportion is:
Aluminium powder 45% (Al content 98%), magnesium powder 5% (Mg content 99%), ferromanganese powder 50% (mid-carbon fe-mn Mn content 75%, Fe 24%).Above-mentioned substance is added silicate adhesive (accounting for gross weight 5%) stir, with press coldmoulding oven dry.
Embodiment 1 molten steel purificant Chemical Composition table 3
| Element | Al | Mg | Mn | Impurity | Fe | ||
| C | S | P | |||||
| Weight % | 44.10 | 4.96 | 37.51 | 0.8 | 0.15 | 0.09 | 12.31 |
In 210 tons of converters, produce SDHD soft steel, adopt in the original production process in tapping process, to add the technology pattern that the aluminium ingot mode is carried out deoxidation and slag making always.Use the molten steel purificant of the above-mentioned composition of the present invention, compare experiment, the results are shown in Table 4
Table 4
| The project heat | The stove number | Molten steel amount (t) | Converter add-on kg/t.s | Refining add-on kg/t.s | |||||
| Al | The molten steel purificant | FeMn | Al | The Al powder | The Al line | FeMn | |||
| Experimental furnace | 7 | 1403 | -- | 5.203 | 0.612 | -- | -- | 0.016 | -- |
| The contrast stove | 6 | 1197 | 2.649 | -- | 1.572 | 0.434 | 0.535 | 0.072 | 1.263 |
Test conditions is suitable substantially, and data have comparability, and continuous casting steel supply is normal.
Contrast heat oxygen consumption 73.22m
3/ t.s, test heat oxygen consumption 70.44m
3/ t.s, test heat tapping C comparison is on average lower by 0.074 than heat tapping C, contrast heat oxygen content in steel 92ppm.With oxygen level 53ppm in the molten steel purificant deoxidized steel of the present invention, need not add ferromanganese again when simultaneously concise, ton steel cost greatly reduces, and sees Table 5.
Table 5 cost effectiveness analysis table
| The contrast project | Full aluminium deoxidation (unit, kg) | Molten steel purificant (unit, kg) |
| Coverter pig aluminium | 17.60×2.649＝46.62 | -- |
| The coverter pig purificant | -- | 12×5.203＝60.36 |
| Converter ferromanganese (LC) | 7.65×1.572＝12.02 | 7.65×0.712＝5.45 |
| Refining aluminium | 17.60×0.178＝3.13 | -- |
| The refining aluminium powder | 19.00×0.535＝10.16 | -- |
| The refining aluminum steel | 18.00×0.072＝1.29 | 18.00×0.607＝10.926 |
| Refined ferromanganese (LC) | 7.65×1.263＝9.64 | -- |
| Increase the manganese amount in the steel | -- | 0.96 |
| Add up to (tax included price unit) | 82.85 | 76.73 |
It is 6.15 yuan (82.85-76.73) that the ton steel can reduce cost, and favorable economic benefit is arranged.
Embodiment 2 is used for the molten steel purificant of medium carbon steel
Aluminium powder 40% (Al content 98%), magnesium powder 10% (Mg content 99%), sial barium strontium calcium ferromanganese pulverized slag 50% is to detecting before the used slag production: SiO
247.51% (Si content 7.52%), Al
2O
311.36% (Al content 1.23%), BaO 8.32% (Ba content 1.51%), SrO2.36% (Sr content 0.26%), CaO 4.38% (Ca content 0.68%), MnO 2.83% (Mn content 0.33%), FeO 21.69% (Fe 3.90%), all the other are impurity.With above-mentioned raw materials powder and silicate adhesive (accounting for gross weight 5%) mixing and stirring, use pressing machine compression moulding.
Embodiment 2 molten steel purificant Chemical Composition tables 6
| Element | Al | Mg | MnO | SiO 2 | BaO | SrO | CaO | Al 2O 3 | Impurity | FeO | ||
| C | S | P | ||||||||||
| Weight % | 39.20 | 9.96 | 1.41 | 23.70 | 4.18 | 1.18 | 2.19 | 5.68 | 0.63 | 0.09 | 0.08 | 11.34 |
SiO in the table 6
2Contain Si3.76%, FeO contains Fe 2.15%, and remaining alloying element is a trace.
Test at 150 tons of steel-making converters, produce the SS400 thin slab, used the ferro-silicon-aluminium deoxidation originally, its composition is Al 45%, Si 25%, and surplus is Fe, and the ton steel adds 3kg.Use molten steel purificant of the present invention, the ton steel adds 3.5kg and compares test, and the quality of steel is significantly improved.Mg content is 4.2PPM in the steel after testing, sulfide-basedly is mingled with 0.5 grade, and silicate is mingled with 0.5 grade, 10 grades of prior austenite grain sizes, and the Wei Shi group is 0.5 grade.Tensile strength exceeds 15MPa than former technology, the high 19Mpa of the former technology of yield strength ratio, and the ton steel is saved 4.36 yuan simultaneously.
Product of the present invention can satisfy deoxidation in steel making, desulfurization, slag making, when improving the alloy recovery requirement, can effectively utilize polynary steelmaking composite deoxidizer sial barium strontium calcium manganeseirom waste residue again.Production molten steel purificant of the present invention does not need secondary remelting, changes the traditional technology of in the past producing composite deoxidant, reduces the cost of this product, and favorable economic benefit and social benefit are arranged.
Claims (1)
1, a kind of molten steel purificant that is used to make steel, its proportioning components (weight):
Aluminium powder: 30-70% wherein contains Al 25-68%;
Magnesium powder: 2-15% wherein contains Mg 2-15%;
Ferromanganese powder: 15-60% wherein contains Mn 10-45%, Fe5-20%;
Sial barium strontium calcium manganeseirom pulverized slag: 15-60% wherein contains SiO
25-36%, Al
2O
30.5-7%, BaO 1-7%, SrO 0.5-3%, CaO 0.5-3%, MnO 0.5-4% still contains the alloying element and the unavoidable impurities of the non-oxidized substance of 10-20% in these oxide compounds, and surplus is FeO;
Can choose wherein one or both full choosings wantonly in described ferromanganese powder and the sial barium strontium calcium ferromanganese pulverized slag, when selecting entirely for two kinds, described ferromanganese powder and sial barium strontium calcium ferromanganese pulverized slag respectively account for 50% among the described composition weight proportion 15-60%;
And unavoidable impurities, Fe is a surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610065838 CN1818094A (en) | 2006-03-27 | 2006-03-27 | Steel liquid cleaner for steel smelting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610065838 CN1818094A (en) | 2006-03-27 | 2006-03-27 | Steel liquid cleaner for steel smelting |
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|---|---|
| CN1818094A true CN1818094A (en) | 2006-08-16 |
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ID=36918289
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135021B (en) * | 2007-06-21 | 2010-06-16 | 赵宇 | Aluminium magnesium ferroalloy for molten steel deoxidization desulfuration and alloying and preparation method thereof |
| CN101906560A (en) * | 2010-07-15 | 2010-12-08 | 首钢总公司 | Magnesium-aluminum-ferromanganese alloy for steelmaking deoxidization and desulphurization and preparation method thereof |
| CN104630414A (en) * | 2015-01-28 | 2015-05-20 | 巩义市众鑫钙业有限公司 | Cold press molding preparation method of alloy addition material used for molten steel refining |
| TWI498426B (en) * | 2012-09-07 | 2015-09-01 | China Steel Corp | Method for treating liquid steel |
| CN111151721A (en) * | 2020-03-05 | 2020-05-15 | 谢应凯 | Method for preparing molten steel purifying agent |
| CN115505677A (en) * | 2021-06-23 | 2022-12-23 | 宝山钢铁股份有限公司 | Low-silicon niobium-manganese ball and preparation method and application thereof |
-
2006
- 2006-03-27 CN CN 200610065838 patent/CN1818094A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135021B (en) * | 2007-06-21 | 2010-06-16 | 赵宇 | Aluminium magnesium ferroalloy for molten steel deoxidization desulfuration and alloying and preparation method thereof |
| CN101906560A (en) * | 2010-07-15 | 2010-12-08 | 首钢总公司 | Magnesium-aluminum-ferromanganese alloy for steelmaking deoxidization and desulphurization and preparation method thereof |
| CN101906560B (en) * | 2010-07-15 | 2012-07-04 | 首钢总公司 | Magnesium-aluminum-ferromanganese alloy for steelmaking deoxidization and desulphurization and preparation method thereof |
| TWI498426B (en) * | 2012-09-07 | 2015-09-01 | China Steel Corp | Method for treating liquid steel |
| CN104630414A (en) * | 2015-01-28 | 2015-05-20 | 巩义市众鑫钙业有限公司 | Cold press molding preparation method of alloy addition material used for molten steel refining |
| CN104630414B (en) * | 2015-01-28 | 2016-08-24 | 巩义市众鑫钙业有限公司 | Cold moudling preparation method for the alloy additive of liquid steel refining |
| CN111151721A (en) * | 2020-03-05 | 2020-05-15 | 谢应凯 | Method for preparing molten steel purifying agent |
| CN115505677A (en) * | 2021-06-23 | 2022-12-23 | 宝山钢铁股份有限公司 | Low-silicon niobium-manganese ball and preparation method and application thereof |
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