CN103114235A - Core-spun thread for increasing N and V in molten steel and use method thereof - Google Patents
Core-spun thread for increasing N and V in molten steel and use method thereof Download PDFInfo
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- CN103114235A CN103114235A CN2013100742670A CN201310074267A CN103114235A CN 103114235 A CN103114235 A CN 103114235A CN 2013100742670 A CN2013100742670 A CN 2013100742670A CN 201310074267 A CN201310074267 A CN 201310074267A CN 103114235 A CN103114235 A CN 103114235A
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Abstract
The invention relates to a core-spun thread for increasing N and V in molten steel and a use method thereof. The technical scheme is as follows: a preparation method comprises the following steps of: mixing 10-25 percent by weight of V2O5 powder, 20-30 percent by weight of silicon nitride iron powder, 10-25 percent by weight of reducing agents and 35-50 percent by weight of additives; uniformly stirring; and wrapping by using a cladding steel strip to obtain the core-spun thread for increasing N and V in the molten steel. The use method of the core-spun thread for increasing N and V in the molten steel comprises the step of adding the core-spun thread for increasing N and V in the molten steel to the molten steel by using a thread feeder at the terminal stage of a smelting reduction period when a medium-low carbon vanadium-containing alloy is smelted, wherein the addition amount of the core-spun thread is 3-22 kg in per ton of steel. The core-spun thread for increasing N and V in the molten steel, which is prepared by the method disclosed by the invention, has the advantages of easiness and convenience for operation, easiness for implementation, controllability and environmental friendliness, can be used for increasing the V2O5 reduction speed, achieving high and stable vanadium yield and fast obtaining the medium-low carbon vanadium-containing alloy steel with high comprehensive mechanical property and mechanical property through a single step for one time and has an outstanding economic benefit.
Description
Technical field
The invention belongs to the technical field of the metallurgical cored-wire of DIRECT ALLOYING.Be specifically related to a kind ofly increase cored-wire and the using method thereof that N increases V for molten steel.
Background technology
At present, use the method for low-carbon (LC) vanadium steel in the manufacturing of DIRECT ALLOYING technique to have two kinds, as follows respectively:
The first is " a kind of V
2O
5The DIRECT ALLOYING process for making " (CN101067182A) disclosed patented technology: when with V
2O
5During for the raw material DIRECT ALLOYING, in latter stage oxidation period in that steel melting furnace is smelted, need remove oxidation sludge, with V
2O
5With the mixture of reductive agent, flux and additive behind broken mixing, in the steel melting furnace of packing into, thereby make V
2O
5In vanadium restore and molten steel directly carried out alloying smelt.In reduction process, add and adjust the composition that flux is adjusted slag, in the reduction end of term, slag depletion agent is added in the stove, to containing V
2O
5Slag reduce dilution, the recovery rate of vanadium is improved.
The second be bibliographical information (Li Yujun, Xu Ninghui, Li Bin etc. ferro-silicon nitride is for the production of exploitation and the application of HRB400. steel research, 2008,36 (5): 45-47,55), this technology applies to produce the technology of the HRB400 III level steel that contains V.And production practice show, the HRB400 III level steel of pair rolling is guaranteeing under the condition that mechanical property does not reduce, and needs main ferro-silicon nitride and the ferro-vanadium of adding.Ferro-vanadium needs special-purpose production unit to smelt, and the technique more complicated, that tap to tap time is long, energy consumption is higher is relative with comprehensive cost high.When production contains the HRB400 III level steel of V, need to add in order quantitative silicon carbide, ferro-silicon nitride, manganese-silicon, carbon dust, vanadium iron and ferrosilicoaluminum.It is more to add reagent type, large usage quantity, and the time, order and the consumption that add reagent have strict regulation, operation inconvenience.
In actual smelting technology, adopt two kinds of methods, need to consume a large amount of raw material and energy and make specific alloy, in the process of feeding intake, not only make work under bad environment, and can cause surrounding enviroment to worsen.When producing, need to adopt a plurality for the treatment of steps and technique, to improve mechanical property and the mechanical property of gained steel, production cost is higher.
Summary of the invention:
The present invention is intended to overcome the prior art defective, purpose provide a kind of easy and simple to handle, easily go controlledly, eco-friendlyly increase the cored-wire that N increases V for molten steel; Use this cored-wire can improve V
2O
5Reduction rate, the recovery rate of vanadium is high and stable, can single step once obtain fast the high middle low-carbon (LC) vanadium steel of comprehensive mechanical property and mechanical property.
For achieving the above object, the technical solution used in the present invention is: first with the V of 10 ~ 25wt%
2O
5The additive of the silicon nitride iron powder of powder, 20 ~ 30wt%, the reductive agent of 10 ~ 25wt% and 35 ~ 50wt% mixes, and stirs, and wraps up with coated steel band again, namely gets for molten steel to increase the cored-wire that N increases V.
Described silicon nitride iron powder is technical grade; In the silicon nitride iron powder: Si content is 48 ~ 51wt%, and N content is 30 ~ 32wt%, and all the other are Fe.
Described reductive agent is that the aluminium powder of 70 ~ 80wt% and the magnesium powder of 20 ~ 30wt% mix composition; Aluminium powder and magnesium powder are technical grade.
Described additive is the iron powder of 70 ~ 85wt%, the CaF of 5 ~ 20wt%
2The CaO powder of powder and 5 ~ 10wt% mixes and forms; Wherein: the Fe content 〉=95wt% in the iron powder, CaF
2Powder and CaO powder are technical grade.
Described V
2O
5V in the powder
2O
5Content 〉=90wt%.
The molten steel that is used for of the present invention preparation increases the using method that N increases the cored-wire of V and is: in smelting during the low-carbon (LC) vanadium steel, in the phase in the smelting reducing end of term, add in the molten steel with feeding wire machine and describedly to increase the cored-wire that N increases V for molten steel, the add-on of steel per ton is 3 ~ 22kg.
Because adopt technique scheme, the present invention compared with prior art has following positively effect:
The silicon nitride iron powder that the present invention adopts is the product that carries out take FeSi75 as raw material behind the nitriding treatment, wherein contains 75% the Si of having an appointment
3N
4, about 20% FeSi and 5% free state Fe.So the silicon nitride iron powder had both had Si
3N
4Character, have again the character of metal Fe and intermetallic compound FeSi, namely the silicon nitride iron powder can be as the nitrogen promoter in the steel, have again weak reductibility.
After the prepared cored-wire line feeding of the present invention enters in the molten steel, because the hot environment of molten steel is brought out FeSi and V in Al, Mg and the silicon nitride iron powder
2O
5Reaction, this reaction is the reduction reaction of heat release, so so that the FeSi in the silicon nitride iron powder and reductive agent and V
2O
5React V
2O
5Can be gone out V by fast restore.
Silicon nitride iron powder among the present invention at high temperature can make and contain more N in the steel.During the molten steel cooling, N and V are preferential in conjunction with generating VN, so can have a large amount of VN in the steel.When follow-up rolling grade was processed operation, the VN solid solution had been played the effect of precipitation strength and inhibiting grain growth in austenite and ferrite.The nitrogen that is present in matrix is more, and the VN that separates out when rolling is more, and particle size is less, and the refined crystalline strengthening effect is more obvious, thereby has greatly improved intensity and the toughness of steel.Can also improve simultaneously welding property and the forming property of steel, namely steel is after the operation such as rolling, and strength and toughness obviously promotes, and can improve comprehensive mechanical property and mechanical property.
The V that reduction produces is unstable, easily is reoxidized.Behind the iron powder in adding additive, Fe and V can form unlimited solid solution.The vanadium that reduction produces is combined with iron and is formed FeV sosoloid, and FeV sosoloid is higher than elemental vanadium stability, is difficult for oxidizedly in molten steel, so has improved the rate of reduction of vanadium and the recovery rate of vanadium.
Added aluminium powder and magnesium powder in the reductive agent that the present invention adopts, the reducing power of aluminium and magnesium is stronger, is easy to V
2O
5Be reduced into vanadium; While V
2O
5With magnesium and reactive aluminum, externally emit a large amount of heats, can so that the temperature of molten steel do not reduce.
The present invention is prepared is used for molten steel and increases in the cored-wire that N increases V, and the reductive agent that adds and the kind of additive are less, and reagent dosage is less.Adopting the purpose of wire-feeding technique is exactly to join light specific gravity, low, the easy oxidation of boiling point and the little vanadium of the solubleness in molten steel in the molten steel, and this method is more more economical and effective than additive method.
When low-carbon (LC) contained the vanadium micro-alloyed steel in smelting, owing to adopt wire-feeding technique and the prepared molten steel that is used for of the present invention to increase the cored-wire that N increases V, it was less to generate the quantity of slag, and does not introduce other impurity.Acquired results is stable, favorable reproducibility.Can the flue gas that operation produces be managed, eliminate the pollution to environment; Simple to operate, standard is controlled, and is easy to maintenance.
In actual mechanical process, only need according to required content of vanadium in the steel, calculate the cored-wire quality, enter ladle in reduction period direct line feeding in latter stage, after it reacts completely, again through refining, casting, forging and the technique such as rolling, can obtain the vanadium alloy steel of required content of vanadium.Be equivalent to single step and once obtain fast required vanadium alloy steel, and the recovery rate of vanadium is stabilized in more than 95%.
Therefore, the present invention is prepared be used for molten steel increase N increase the cored-wire of V easy and simple to handle, easily go controlled and the border is friendly, use this cored-wire can improve V
2O
5Reduction rate, the recovery rate of vanadium is high and stable, can single step once obtain fast the high middle low-carbon (LC) vanadium steel of comprehensive mechanical property and mechanical property, has significant economic benefit.
Embodiment
The invention will be further described below in conjunction with embodiment, is not the restriction to its protection domain.
For avoiding repetition, the first raw material unification that this embodiment is involved is described below, and repeats no more among the embodiment:
The silicon nitride iron powder is technical grade; In the silicon nitride iron powder: Si content is 48 ~ 51wt%, and N content is 30 ~ 32wt%, and all the other are Fe.
Reductive agent is that the aluminium powder of 70 ~ 80wt% and the magnesium powder of 20 ~ 30wt% mix composition; Aluminium powder and magnesium powder are technical grade.
Additive is the iron powder of 70 ~ 85wt%, the CaF of 5 ~ 20wt%
2The CaO powder of powder and 5 ~ 10wt% mixes and forms; Wherein: the Fe content 〉=95wt% in the iron powder, CaF
2Powder and CaO powder are technical grade.
V
2O
5V in the powder
2O
5Content 〉=90wt%.
Embodiment 1
A kind ofly increase cored-wire and the using method thereof that N increases V for molten steel.First with the V of 10 ~ 15wt%
2O
5The additive of the silicon nitride iron powder of powder, 24 ~ 28wt%, the reductive agent of 10 ~ 15wt% and 45 ~ 50wt% mixes, and stirs, and wraps up with coated steel band again, namely gets for molten steel to increase the cored-wire that N increases V.
The molten steel that is used for of present embodiment preparation increases the using method that N increases the cored-wire of V and is: smelt non-hardened and tempered steel 40Mn2V, adopt 20 tons electric arc furnace smelting, the content of vanadium of non-hardened and tempered steel 40Mn2V is 0.1 ~ 0.12wt%.
Adopt the prepared molten steel that is used for of present embodiment to increase N and increase the cored-wire of V as the source of vanadium.In the reduction period latter stage of smelting, increase the cored-wire that N increases V with feeding wire machine feeding in the molten steel for molten steel, the add-on of steel per ton is 12 ~ 20kg, after cored-wire reacts completely in molten steel, can obtain the molten steel that vanadiumcontent is 0.1 ~ 0.12wt%.Then carry out slag making, refining, casting, forging and rolling technology, namely get the 40Mn2V non-hardened and tempered steel.
Embodiment 2
A kind ofly increase cored-wire and the using method thereof that N increases V for molten steel.First with the V of 13 ~ 19wt%
2O
5The additive of the silicon nitride iron powder of powder, 22 ~ 26wt%, the reductive agent of 13 ~ 19wt% and 42 ~ 47wt% mixes, and stirs, and wraps up with coated steel band again, namely gets for molten steel to increase the cored-wire that N increases V.
The molten steel that is used for of present embodiment preparation increases the using method that N increases the cored-wire of V and is: smelt non-hardened and tempered steel 36Mn2V, adopt 20 tons electric arc furnace smelting, the content of vanadium of non-hardened and tempered steel 36Mn2V is 0.11 ~ 0.16 wt%.
Adopt the prepared molten steel that is used for of present embodiment to increase N and increase the cored-wire of V as the source of vanadium.In the reduction period latter stage of smelting, increase the cored-wire that N increases V with feeding wire machine feeding in the molten steel for molten steel, the add-on of steel per ton is 10 ~ 22kg, after cored-wire reacts completely in molten steel, can obtain the molten steel that vanadiumcontent is 0.11 ~ 0.16wt%.Then carry out slag making, refining, casting, forging and rolling technology, namely get the 36Mn2V non-hardened and tempered steel.
Embodiment 3
A kind ofly increase cored-wire and the using method thereof that N increases V for molten steel.First with the V of 15 ~ 22wt%
2O
5The additive of the silicon nitride iron powder of powder, 26 ~ 30wt%, the reductive agent of 15 ~ 22wt% and 37 ~ 43wt% mixes, and stirs, and wraps up with coated steel band again, namely gets for molten steel to increase the cored-wire that N increases V.
The molten steel that is used for of present embodiment preparation increases the using method that N increases the cored-wire of V and is: smelt non-hardened and tempered steel F35MnVN, adopt 20 tons electric arc furnace smelting, the content of vanadium of non-hardened and tempered steel F35MnVN is 0.06 ~ 0.13 wt%.
Adopt the prepared molten steel that is used for of present embodiment to increase N and increase the cored-wire of V as the source of vanadium.In the reduction period latter stage of smelting, increase the cored-wire that N increases V with feeding wire machine feeding in the molten steel for molten steel, the add-on of steel per ton is 5 ~ 19kg, after cored-wire reacts completely in molten steel, can obtain the molten steel that vanadiumcontent is 0.06 ~ 0.13wt%.Then carry out slag making, refining, casting, forging and rolling technology, namely get the F35MnVN non-hardened and tempered steel, N% 〉=90ppm in the gained steel.
Embodiment 4
A kind ofly increase cored-wire and the using method thereof that N increases V for molten steel.First with the V of 20 ~ 25wt%
2O
5The additive of the silicon nitride iron powder of powder, 20 ~ 24wt%, the reductive agent of 20 ~ 25wt% and 35 ~ 40wt% mixes, and stirs, and wraps up with coated steel band again, namely gets for molten steel to increase the cored-wire that N increases V.
The molten steel that is used for of present embodiment preparation increases the using method that N increases the cored-wire of V and is: smelt structure iron 15MnV, adopt 20 tons electric arc furnace smelting, the content of vanadium of structure iron 15MnV is 0.04 ~ 0.12 wt%.
Adopt the prepared molten steel that is used for of present embodiment to increase N and increase the cored-wire of V as the source of vanadium.The reduction period latter stage of target for smelting increases the cored-wire that N increases V with feeding wire machine feeding in the molten steel for molten steel, and the add-on of steel per ton is 3 ~ 10kg, after cored-wire reacts completely in molten steel, can obtain the molten steel that vanadiumcontent is 0.04 ~ 0.12 wt%.Then carry out slag making, refining, casting, forging and rolling technology, namely get the 15MnV structure iron.
The silicon nitride iron powder that this embodiment adopts is the product that carries out take FeSi75 as raw material behind the nitriding treatment, wherein contains 75% the Si of having an appointment
3N
4, about 20% FeSi and 5% free state Fe.So the silicon nitride iron powder had both had Si
3N
4Character, have again the character of metal Fe and intermetallic compound FeSi, namely the silicon nitride iron powder can be as the nitrogen promoter in the steel, have again weak reductibility.
After the prepared cored-wire line feeding of this embodiment enters in the molten steel, because the hot environment of molten steel is brought out FeSi and V in Al, Mg and the silicon nitride iron powder
2O
5Reaction, this reaction is the reduction reaction of heat release, so so that the FeSi in the silicon nitride iron powder and reductive agent and V
2O
5React V
2O
5Can be gone out V by fast restore.
Silicon nitride iron powder in this embodiment at high temperature can make and contain more N in the steel.During the molten steel cooling, N and V are preferential in conjunction with generating VN, so can have a large amount of VN in the steel.When follow-up rolling grade was processed operation, the VN solid solution had been played the effect of precipitation strength and inhibiting grain growth in austenite and ferrite.The nitrogen that is present in matrix is more, and the VN that separates out when rolling is more, and particle size is less, and the refined crystalline strengthening effect is more obvious, thereby has greatly improved intensity and the toughness of steel.Can also improve simultaneously welding property and the forming property of steel, namely steel is after the operation such as rolling, and strength and toughness obviously promotes, and can improve comprehensive mechanical property and mechanical property.
The V that reduction produces is unstable, easily is reoxidized.Behind the iron powder in adding additive, Fe and V can form unlimited solid solution.The vanadium that reduction produces is combined with iron and is formed FeV sosoloid, and FeV sosoloid is higher than elemental vanadium stability, is difficult for oxidizedly in molten steel, so has improved the rate of reduction of vanadium and the recovery rate of vanadium.
Added aluminium powder and magnesium powder in the reductive agent that this embodiment adopts, the reducing power of aluminium and magnesium is stronger, is easy to V
2O
5Be reduced into vanadium; While V
2O
5With magnesium and reactive aluminum, externally emit a large amount of heats, can so that the temperature of molten steel do not reduce.
This embodiment is prepared is used for molten steel and increases in the cored-wire that N increases V, and the reductive agent that adds and the kind of additive are less, and reagent dosage is less.Adopting the purpose of wire-feeding technique is exactly to join light specific gravity, low, the easy oxidation of boiling point and the little vanadium of the solubleness in molten steel in the molten steel, and this method is more more economical and effective than additive method.
When low-carbon (LC) contained the vanadium micro-alloyed steel in smelting, owing to adopt wire-feeding technique and the prepared molten steel that is used for of this embodiment to increase the cored-wire that N increases V, it was less to generate the quantity of slag, and does not introduce other impurity.Acquired results is stable, favorable reproducibility.Can the flue gas that operation produces be managed, eliminate the pollution to environment; Simple to operate, standard is controlled, and is easy to maintenance.
In actual mechanical process, only need according to required content of vanadium in the steel, calculate the cored-wire quality, enter ladle in reduction period direct line feeding in latter stage, after it reacts completely, again through refining, casting, forging and the technique such as rolling, can obtain the vanadium alloy steel of required content of vanadium.Be equivalent to single step and once obtain fast required vanadium alloy steel, and the recovery rate of vanadium is stabilized in more than 95%.
Therefore, this embodiment is prepared be used for molten steel increase N increase the cored-wire of V easy and simple to handle, easily go controlled and the border is friendly, use this cored-wire can improve V
2O
5Reduction rate, the recovery rate of vanadium is high and stable, can single step once obtain fast the high middle low-carbon (LC) vanadium steel of comprehensive mechanical property and mechanical property, has significant economic benefit.
Claims (3)
1. one kind is used for molten steel and increases the cored-wire that N increases V, it is characterized in that first the V with 10 ~ 25wt%
2O
5The additive of the silicon nitride iron powder of powder, 20 ~ 30wt%, the reductive agent of 10 ~ 25wt% and 35 ~ 50wt% mixes, and stirs, and wraps up with coated steel band again, namely gets for molten steel to increase the cored-wire that N increases V;
Described silicon nitride iron powder is technical grade; In the silicon nitride iron powder: Si content is 48 ~ 51wt%, and N content is 30 ~ 32wt%, and all the other are Fe;
Described reductive agent is that the aluminium powder of 70 ~ 80wt% and the magnesium powder of 20 ~ 30wt% mix composition; Aluminium powder and magnesium powder are technical grade;
Described additive is the iron powder of 70 ~ 85wt%, the CaF of 5 ~ 20wt%
2The CaO powder of powder and 5 ~ 10wt% mixes and forms; Wherein: the Fe content 〉=95wt% in the iron powder, CaF
2Powder and CaO powder are technical grade.
2. according to claim 1ly increase the cored-wire that N increases V for molten steel, it is characterized in that described V
2O
5V in the powder
2O
5Content 〉=90wt%.
3. one kind as claimed in claim 1ly increases the using method that N increases the cored-wire of V for molten steel, it is characterized in that: in smelting during the low-carbon (LC) vanadium steel, in the phase in the smelting reducing end of term, add in the molten steel with feeding wire machine and describedly to increase the cored-wire that N increases V for molten steel, the add-on of steel per ton is 3 ~ 22kg.
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|---|---|---|---|
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|---|---|---|---|
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| CN103571996A (en) * | 2013-10-18 | 2014-02-12 | 马鞍山中冶钢铁冶金高新技术有限公司 | Vanadium oxide core-spun yarn for smelting vanadium microalloyed steel to increase vanadium content |
| CN104017944A (en) * | 2014-06-10 | 2014-09-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-containing steel, cored wire containing titanium-iron alloy and aluminium shots, application of cored wire, molten steel and preparation method of molten steel |
| CN104032075A (en) * | 2014-06-10 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Weathering steel, cored wire containing niobium-iron alloy, application of cored wire, molten steel and preparation method of molten steel |
| CN104032076A (en) * | 2014-06-10 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Weathering steel, cored wire containing niobium-iron alloy and iron-calcium alloy, application of cored wire, molten steel and preparation method of molten steel |
| CN104032081A (en) * | 2014-06-13 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-containing weathering steel, cored wire containing titanium-iron alloy and iron-calcium alloy, application of cored wire, molten steel and preparation method of molten steel |
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| CN104046735A (en) * | 2013-12-06 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Cored wire, its application, vanadium and nitrogen alloyed molten steel, preparation method of vanadium and nitrogen alloyed molten steel, and vanadium and nitrogen micro-alloyed steel |
| CN104046732A (en) * | 2013-12-06 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Cored wire, its application, vanadium and nitrogen alloyed molten steel, preparation method of vanadium and nitrogen alloyed molten steel, and vanadium and nitrogen micro-alloyed steel |
| CN104726641A (en) * | 2014-04-28 | 2015-06-24 | 浙江宝信新型炉料科技发展有限公司 | Titanium silicon nitride core-spun yarn |
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| CN103571996B (en) * | 2013-10-18 | 2015-08-05 | 马鞍山中冶钢铁冶金高新技术有限公司 | Smelt Vanadium Microalloyed Plate Steels and increase vanadium barium oxide cored-wire and preparation method thereof |
| CN103571996A (en) * | 2013-10-18 | 2014-02-12 | 马鞍山中冶钢铁冶金高新技术有限公司 | Vanadium oxide core-spun yarn for smelting vanadium microalloyed steel to increase vanadium content |
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