CN105087857A - Method for reducing oxygen content of molten steel by controlling decarbonization speed during process of smelting in acidic electric arc furnace - Google Patents
Method for reducing oxygen content of molten steel by controlling decarbonization speed during process of smelting in acidic electric arc furnace Download PDFInfo
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- CN105087857A CN105087857A CN201410193503.5A CN201410193503A CN105087857A CN 105087857 A CN105087857 A CN 105087857A CN 201410193503 A CN201410193503 A CN 201410193503A CN 105087857 A CN105087857 A CN 105087857A
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Abstract
The invention discloses a method for reducing the oxygen content of molten steel by controlling the decarbonization speed during the process of smelting in an acidic electric arc furnace, and belongs to the technical field of steel smelting. The method is characterized by comprising the following steps: loading materials, smelting the materials, carrying out decarbonization after smelting, wherein the decarbonization speed is 0.05 wt% C/min, 0.08 wt% C/min, 0.011 wt% C/min, 0.014 wt% C/min, and 0.017 wt% C/min in different periods; when the carbon content is reduced to 0.15 to 0.20 wt%, discharging part of steel slag, at the same time, adding a proper amount of limestone to carry out static boiling, then adding a proper amount of limestone and a proper amount of silicon-iron powder, maintaining for 5 minutes to carry out reduction; when the temperature reaches 1660 to 1680 DEG C, adding manganese iron; and when the temperature reaches 1710 to 1730 DEG C, discharging the steel; wherein adding 1 kilogram of aluminum into the steel discharge groove for each ton of steel during the steel discharging process, and before casting a composite rare earth alterant is added into each casting ladle.
Description
Technical field
The invention belongs to smelting iron and steel technical field, refer in particular to a kind of melting in acid arc furnace and control the method that decarbonization rate reduces molten steel oxygen level.
Background technology
Steel-making is an important step in Steel Castings.Quality and the molten steel of steel casting have much relations.Mechanical properties of cast steel determined by the chemical composition of molten steel to a great extent.And a variety of casting flaw, as: molten steel oxygen level, pore, hot tearing etc. also all have much relations with the quality of molten steel.Therefore, ensure that casting quality just must smelt high-quality molten steel.In molten steel, oxygen level increases, then the gas in molten steel and oxide inclusion increase, and this kind of oxide inclusion can be formed in ladle metallurgy process, also can generate between casting cycle; In addition the residue oxygen level that solidificating period is separated also can generate oxide inclusion.The main component of oxide compound is Al
2o
3, CaO, SiO
2, and MgO.The increase of oxide inclusion, worsens quality of molten steel, the final mechanical property reducing steel.Therefore be necessary to control the oxygen level in molten steel, thus reduce oxide inclusion, cleaning molten steel.
The present invention develops a kind of melting in acid arc furnace and controls the method that decarbonization rate reduces molten steel oxygen level.
Summary of the invention
Melting in acid arc furnace controls the method that decarbonization rate reduces molten steel oxygen level, it is characterized in that, controls decarbonization rate.Decarburization is a significant process in steel-making, and the oxidation of carbon causes molten steel to seethe with excitement, and can remove the gas in molten steel and inclusion, play cleaning molten steel.And, boiling the stirring action that rises, the homogeneous temperature of molten steel in molten bath can be made.Therefore, process for making specifies, the mean carbon content of furnace charge should exceed the regulation carbon content of steel, to be fallen by this part unnecessary oxidation of coal in oxidation period.Decarburization we adopt be ore deoxidation method.In fact being no matter which kind of method, in order to reach the object of cleaning molten steel effectively, suitable decarbonization rate must being had, to be formed active in molten steel but be not too violent boiling.
ZG31Mn2Si steel is smelted on 5T acid electric arc furnace, Composition Control scope: C0.26-0.36wt%, Si0.5-0.9wt%, Mn1.1-1.6wt%, S, P≤0.05wt%.Main technique main points are as follows.
Charging, fusing, fusing latter stage should slag making in time according to fusing situation, molten complete after: C0.3-0.45wt%, S, P≤0.04wt%; The iron ore adding furnace charge 0.5wt% oxidation period carries out oxidation and decarbonization (in smelting process, decarbonization rate is undertaken by 0.005wt%C/min, 0.008wt%C/min, 0.011wt%C/min, 0.014wt%C/min, 0.017wt%C/min), when carbon is down to 0.15-0.20wt%, flow out part slag, and the 0.3wt% Wingdale adding furnace charge carries out pool boiling, the ready-made mark of pool boiling: slag specimen surface is brown; Molten steel temperature 1620-1640 DEG C; Molten steel is after abundant pool boiling, and the 0.1wt% ferrosilicon powder of the 0.3wt% Wingdale and furnace charge that add furnace charge keeps 5min, reduces; The 0.1wt% ferromanganese of furnace charge is added: tapping temperature 1710-1730 DEG C during temperature 1660-1680 DEG C; On tapping spout, the aluminium of 1Kg/t steel is added during tapping.Before cast, the 0.1wt% composite rare-earth modifier of furnace charge is added in cast parcel, composite rare-earth modifier is, Nd10 ~ 15wt%, Ce10 ~ 15wt%, Y8 ~ 12wt%, Tb6 ~ 8wt%, Sc5 ~ 7wt%, Pr5 ~ 7wt%, La+Yb+Gd+Er+Tm+Lu+Dy+Ho are 10 ~ 20wt%, B4 ~ 6wt%, V2 ~ 4wt%, W2 ~ 4wt%, Yu Weitie.
As can be seen from Fig. 1,2 and 3, when decarbonization rate controls at 0.008-0.012wt%C/min, the oxygen level in molten steel is lower; And when decarbonization rate too low or too high time, be all unfavorable for reducing the oxygen level in molten steel.Decarbonization rate is low, and molten bath boiling is inviolent, can not play good agitation molten pool effect, be unfavorable for the floating of gas and slag inclusion, cause oxygen level in molten steel higher, cause later stage oxygen content in steel always higher, is unfavorable for the final deoxygenation of molten steel and the rotten of alterant; Decarbonization rate too high (>0.014wt%C/min), to flux overlong time due to melting period oxygen blast, and just start when melting period, bath temperature did not come up pressure add ore deposit oxidation, cause ferrous oxide content in oxidation initial stage slag too high, and after oxidation bath temperature in mid-term is gone up, causing molten bath there is violent reaction between carbon and oxygen, cause large boiling, a part of bits and gas are involved in molten steel again, not only do not play active effect, have negative interaction on the contrary.
accompanying drawing explanation
Fig. 1 decarbonization rate is on the impact of molten steel oxygen level
Fig. 2 decarbonization rate is on the impact of residual Re content
In figure, "●" is I type for steel telogenesis product oxide form; " ▲ " represents Finished Steel oxide form is II type
The relation of Fig. 3 decarbonization rate and impelling strength
In figure, "●" represents Finished Steel oxide form is I type; " ▲ " represents Finished Steel oxide form is II type
embodiment
ZG31Mn2Si steel is smelted on 5T acid electric arc furnace, Composition Control scope: C0.26-0.36wt%, Si0.5-0.9wt%, Mn1.1-1.6wt%, S, P≤0.05wt%.
Main technique main points are as follows.
Charging, fusing, fusing latter stage should slag making in time according to fusing situation, molten complete after: C0.3-0.45wt%, S, P≤0.04wt%; The iron ore adding furnace charge 0.5wt% oxidation period carries out oxidation and decarbonization (in smelting process, decarbonization rate is undertaken by 0.005wt%C/min, 0.008wt%C/min, 0.011wt%C/min, 0.014wt%C/min, 0.017wt%C/min), when carbon is down to 0.15-0.20wt%, flow out part slag, and the 0.3wt% Wingdale adding furnace charge carries out pool boiling, the ready-made mark of pool boiling: slag specimen surface is brown; Molten steel temperature 1620-1640 DEG C; Molten steel is after abundant pool boiling, and the 0.1wt% ferrosilicon powder of the 0.3wt% Wingdale and furnace charge that add furnace charge keeps 5min, reduces; The 0.1wt% ferromanganese of furnace charge is added: tapping temperature 1710-1730 DEG C during temperature 1660-1680 DEG C; On tapping spout, the aluminium of 1Kg/t steel is added during tapping.Before cast, the 0.1wt% composite rare-earth modifier of furnace charge is added in cast parcel.As can be seen from Fig. 1,2 and 3, good decarbonization rate should control to be advisable when 0.008-0.012wt%C/min.
Claims (2)
1. melting in acid arc furnace controls the method that decarbonization rate reduces molten steel oxygen level, and it is characterized in that, ZG31Mn2Si steel is smelted on 5T acid electric arc furnace, Composition Control scope: C0.26-0.36wt%, Si0.5-0.9wt%, Mn1.1-1.6wt%, S, P≤0.05wt%; Main technique main points are as follows; Charging, fusing, fusing latter stage should slag making in time according to fusing situation, molten complete after: C0.3-0.45wt%, S, P≤0.04wt%; The iron ore adding furnace charge 0.5wt% oxidation period carries out oxidation and decarbonization, in smelting process, decarbonization rate is undertaken by 0.005wt%C/min, 0.008wt%C/min, 0.011wt%C/min, 0.014wt%C/min, 0.017wt%C/min, when carbon is down to 0.15-0.20wt%, flow out part slag, and the 0.3wt% Wingdale adding furnace charge carries out pool boiling, the ready-made mark of pool boiling: slag specimen surface is brown; Molten steel temperature 1620-1640 DEG C; Molten steel is after abundant pool boiling, and the 0.1wt% ferrosilicon powder of the 0.3wt% Wingdale and furnace charge that add furnace charge keeps 5min, reduces; The 0.1wt% ferromanganese of furnace charge is added: tapping temperature 1710-1730 DEG C during temperature 1660-1680 DEG C; On tapping spout, the aluminium of 1Kg/t steel is added during tapping; Before cast, the 0.1wt% composite rare-earth modifier of furnace charge is added in cast parcel, composite rare-earth modifier is, Nd10 ~ 15wt%, Ce10 ~ 15wt%, Y8 ~ 12wt%, Tb6 ~ 8wt%, Sc5 ~ 7wt%, Pr5 ~ 7wt%, La+Yb+Gd+Er+Tm+Lu+Dy+Ho are 10 ~ 20wt%, B4 ~ 6wt%, V2 ~ 4wt%, W2 ~ 4wt%, Yu Weitie.
2. a kind of melting in acid arc furnace controls the method that decarbonization rate reduces molten steel oxygen level according to claim 1, and good decarbonization rate should control to be advisable when 0.008-0.012wt%C/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI778563B (en) * | 2020-04-01 | 2022-09-21 | 日商Ｊｆｅ鋼鐵股份有限公司 | Decarburization refining method of molten steel under reduced pressure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087856A (en) * | 2014-05-07 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Method for reducing oxygen content of molten steel smelted in acidic electric arc furnace through controlling static boiling time |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087856A (en) * | 2014-05-07 | 2015-11-25 | 镇江忆诺唯记忆合金有限公司 | Method for reducing oxygen content of molten steel smelted in acidic electric arc furnace through controlling static boiling time |
Non-Patent Citations (3)
| Title |
|---|
| 司乃潮 等: "《冶炼过程的脱碳速度对硅锰钢性能的影响》", 《铸造》 * |
| 司乃潮 等: "《静沸腾时间对硅锰钢性能的影响及参数优化》", 《铸造 》 * |
| 王晓辉 等: "《硅锰钢履带板冲击韧性的影响因素》", 《拖拉机与农用运输车》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI778563B (en) * | 2020-04-01 | 2022-09-21 | 日商Ｊｆｅ鋼鐵股份有限公司 | Decarburization refining method of molten steel under reduced pressure |
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