CN102212737A - Core-spun thread and method for implementing molten steel vanadium-nitrogen alloying - Google Patents
Core-spun thread and method for implementing molten steel vanadium-nitrogen alloying Download PDFInfo
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- CN102212737A CN102212737A CN 201110121060 CN201110121060A CN102212737A CN 102212737 A CN102212737 A CN 102212737A CN 201110121060 CN201110121060 CN 201110121060 CN 201110121060 A CN201110121060 A CN 201110121060A CN 102212737 A CN102212737 A CN 102212737A
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Abstract
The invention discloses a core-spun thread and method for implementing molten steel vanadium-nitrogen alloying, and the method can be used for feeding the core-spun thread into molten steel conveniently and preventing the thread from being jammed and broken and is beneficial to improving the recovery rate of nitrogen and vanadium. The core-spun thread comprises a core layer and skin, wherein the core layer contains vanadium nitride alloy and fluorite. The method mainly comprises the following steps: adding the fluorite to the core layer of the core-spun thread; and then feeding the core-spun thread into the molten steel. The method has the beneficial effects that the fluorite is added into the core layer, so that the melting point of steel slag is reduced and the steel slag fluidity is improved so as to facilitate the process of feeding the core-spun thread into the molten steel, thus reducing the loss of the core-spun thread in steel slag layers, being beneficial to improving the recovery rate of vanadium and nitrogen and preventing the core-spun thread from being jammed and broken during the feeding process.
Description
Technical field
The present invention relates to a kind of be used to the realize cored-wire of molten steel vanadium, nitrogen alloying and the method that is used to realize molten steel vanadium, nitrogen alloying.
Background technology
Alloy of vanadium nitride is a kind of novel alloy additive, can substitute the production that vanadium iron is used for microalloyed steel.Alloy of vanadium nitride makes an addition to the comprehensive mechanical performances such as intensity, toughness, ductility and thermal fatigue resistance that can improve steel in the steel, and makes steel have good weldability.Reaching under the same intensity, adding vanadium nitride and save vanadium add-on 30～40%, and then reduced cost.Alloy of vanadium nitride can be used for structure iron, tool steel, and pipe line steel is in reinforcing bar and the cast iron.Alloy of vanadium nitride is applied to can carry out effective vanadium, nitrogen microalloying simultaneously in the high-strength low-alloy steel, and what promote carbon in the steel, vanadium, nitrogen compound separates out more effective performance sedimentation reinforcement and crystal grain thinning effect.
Because directly that alloy of vanadium nitride is lower with the rate of recovery that block-shape morphology adds in the molten steel, so mainly be to realize molten steel vanadium, nitrogen alloying in the prior art by the method that in molten steel, feeds cored-wire.This method is block or the physical method fragmentation of spherical alloy of vanadium nitride, packs into cored-wire with iron sheet or sheetmetal again, and alloy of vanadium nitride forms the sandwich layer of cored-wire, and iron sheet or sheetmetal form the crust of cored-wire; Then with above-mentioned cored-wire by in the molten steel in the Yarn feeding device feeding ladle, make molten steel vanadium, nitrogen alloying.This kind method vanadium, the nitrogen alloying element rate of recovery are higher, and vanadium recovery is 88～95%, and nitrogen recovery is 70～90%.But this kind method has the following disadvantages: because the slag on molten steel surface is thicker and have a certain rigidity, make cored-wire difficulty pass in the slag feeding molten steel, and, cored-wire and slag are long duration of contact, cored-wire is melted too early, be unfavorable for the raising of vanadium recovery and nitrogen recovery, also can make the fluctuating range of vanadium recovery and nitrogen recovery bigger, influence the stability of quality product.
In addition, Chinese patent 200610020447.0 discloses a kind of cored-wire that is used to realize molten steel vanadium, nitrogen alloying, and this cored-wire comprises steel crust and the sandwich layer of being made by alloy of vanadium nitride.This cored-wire the problems referred to above can occur when reality is used, just be not easy to pass in the slag feeding molten steel.
Summary of the invention
The technical problem that the present invention solves provides a kind of cored-wire that is used to realize molten steel vanadium, nitrogen alloying of being convenient to feed molten steel.
The technical solution adopted for the present invention to solve the technical problems is: be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer contains alloy of vanadium nitride, and described sandwich layer also contains fluorite.
Further be: the alloy of vanadium nitride of described sandwich layer and fluorite all are powder, and the particle diameter of described powder is smaller or equal to 5mm.
Further be: described sandwich layer also contains the iron alloy additive, described alloy of vanadium nitride, the content of fluorite and iron alloy additive is by weight percentage: alloy of vanadium nitride: 70%～95%, fluorite: 5%～15%, the iron alloy additive: 0～25%, wherein, described iron alloy additive is at least a in the following alloy: ferro-titanium, ferrocolumbium, ferro-vanadium.
Further be: the iron alloy additive of described sandwich layer is a powder, and the particle diameter of described powder is smaller or equal to 5mm.
The present invention also provides a kind of method that is used to realize molten steel vanadium, nitrogen alloying, and this method is convenient to cored-wire is fed in the molten steel.
This method may further comprise the steps:
A, make cored-wire, comprise the sandwich layer of making cored-wire and sandwich layer is wrapped to form cored-wire by crust, wherein, the sandwich layer of described cored-wire contains alloy of vanadium nitride and fluorite;
B, cored-wire that steps A is made are by the molten steel in the Yarn feeding device feeding ladle.
Further be: the alloy of vanadium nitride of the sandwich layer in the described steps A and fluorite all are powder, and the particle diameter of described powder is smaller or equal to 5mm.
Further be: the sandwich layer in the described steps A also contains the iron alloy additive, described alloy of vanadium nitride, the content of fluorite and iron alloy additive is by weight percentage: alloy of vanadium nitride: 70%～95%, fluorite: 5%～15%, the iron alloy additive: 0～25%, wherein, described iron alloy additive is at least a in the following alloy: ferro-titanium, ferrocolumbium, ferro-vanadium.
Further be: the iron alloy additive of described sandwich layer is a powder, and the particle diameter of described powder is smaller or equal to 5mm.
Further be: among the described step B, on one side with cored-wire by the molten steel in the Yarn feeding device feeding ladle, on one side ladle is rocked.
Further be: among the described step B, on one side with cored-wire by the molten steel in the Yarn feeding device feeding ladle, on one side to cored-wire and the molten steel contact area rare gas element of jetting.
The invention has the beneficial effects as follows: by in sandwich layer, adding fluorite, can reduce the fusing point of slag, improve the flowability of slag, the slag flowability better can be convenient to cored-wire is fed in the molten steel, reduce the loss of cored-wire at the slag layer, help improving vanadium recovery and nitrogen recovery, also can prevent card line and the broken string of cored-wire in feeding molten steel process.
Description of drawings
Fig. 1 is the synoptic diagram of cored-wire.
Be labeled as among the figure: 1-crust, 2-sandwich layer.
Embodiment
The present invention is further described below in conjunction with embodiment.
As shown in Figure 1, the cored-wire that is used to realize molten steel vanadium, nitrogen alloying of the present invention comprises sandwich layer 2, and described sandwich layer 2 contains alloy of vanadium nitride, and described sandwich layer 2 also contains fluorite.By in sandwich layer, adding fluorite, can reduce the fusing point of slag, improve the flowability of slag, the slag flowability better can be convenient to cored-wire is fed in the molten steel, reduce the loss of cored-wire at the slag layer, help improving vanadium recovery and nitrogen recovery,, can prevent that therefore cored-wire from card line and broken string taking place in the feeding process because the slag flowability improves.
Fuse into fast in the molten steel for the ease of alloy of vanadium nitride, also for the ease of fluorite fast and slag-metal reaction, the alloy of vanadium nitride of described sandwich layer and fluorite all are powder, and the particle diameter of described powder is smaller or equal to 5mm.
For when being convenient to the alloy of vanadium nitride adding, also be convenient to other alloying element is added molten steel, also contain the iron alloy additive in the sandwich layer 2 of above-mentioned cored-wire, described alloy of vanadium nitride, the content of fluorite and iron alloy additive is by weight percentage: alloy of vanadium nitride: 70%～95%, fluorite: 5%～15%, the iron alloy additive: 0～25%, wherein, described iron alloy additive is at least a in the following alloy: ferro-titanium, ferrocolumbium, ferro-vanadium.The weight percent of above-mentioned iron alloy additive is: 0～25%, that is to say that the content of iron alloy additive can be zero.Cored-wire adopts the said ratio mode, on the one hand can be by the adding of fluorite, be convenient to cored-wire and pass slag feeding molten steel, the feeding efficient that can guarantee alloy of vanadium nitride on the other hand is higher, if fluorite too high levels, then the content of alloy of vanadium nitride is corresponding lower, can make the feeding efficient of alloy of vanadium nitride lower, so the content of alloy of vanadium nitride and fluorite should be controlled in the reasonable proportioning scope.In addition, when not containing the iron alloy additive in the cored-wire, just only contain alloy of vanadium nitride and fluorite, then alloy of vanadium nitride and fluorite can be alloy of vanadium nitride by weight percentage: 85%～95%, and fluorite: 5%～15%.
For the ease of above-mentioned iron alloy additive is fused in the molten steel, also be convenient to the making of the sandwich layer 2 of cored-wire, the iron alloy additive of described sandwich layer 2 is a powder, the particle diameter of described powder is smaller or equal to 5mm.
Of the present inventionly be used to realize that the method for molten steel vanadium, nitrogen alloying may further comprise the steps:
A, make cored-wire, comprise the sandwich layer 2 of making cored-wire and sandwich layer is wrapped to form cored-wire by crust 1, wherein, the sandwich layer 2 of described cored-wire contains alloy of vanadium nitride and fluorite;
B, cored-wire that steps A is made are by the molten steel in the Yarn feeding device feeding ladle.
Adopt aforesaid method, when feeding cored-wire in the molten steel, if the slag on molten steel top layer is better mobile, then cored-wire can feed in the molten steel smoothly; If the slag on molten steel top layer is thicker, mobile relatively poor, cored-wire also can feed in the molten steel smoothly, and this is because the fluorite that the sandwich layer of cored-wire contains has increased the flowability of slag, the resistance that has run into when having reduced the cored-wire feeding.And, continuing in the process of feeding molten steel at cored-wire, the sustainable and slag-metal reaction of fluorite in the sandwich layer of cored-wire guarantees that the flowability of slag is all better in the whole feeding process.In addition, in the cored-wire course of processing, alloy of vanadium nitride can be uniformly mixed to form sandwich layer with fluorite, forms cored-wire by sheetmetal or iron sheet parcel sandwich layer then; Can also for: fluorite as skin, alloy of vanadium nitride adopts the form of fluorite parcel alloy of vanadium nitride to make sandwich layer as internal layer, the crust of being made by sheetmetal or iron sheet in fluorite layer external parcel forms cored-wire then.
In the aforesaid method, fuse into fast in the molten steel for the ease of alloy of vanadium nitride, also for the ease of fluorite fast and slag-metal reaction, the alloy of vanadium nitride of the sandwich layer 2 in the described steps A and fluorite all are powder, and the particle diameter of described powder is smaller or equal to 5mm.
In the aforesaid method, for when being convenient to the alloy of vanadium nitride adding, also to be convenient to other alloying element is added molten steel, the sandwich layer 2 in the described steps A also contains the iron alloy additive, described alloy of vanadium nitride, the content of fluorite and iron alloy additive is by weight percentage: alloy of vanadium nitride: 70%～95%, and fluorite: 5%～15%, iron alloy additive: 0～25%, wherein, described iron alloy additive is at least a in the following alloy: ferro-titanium, ferrocolumbium, ferro-vanadium.On the basis of the above, for the ease of above-mentioned iron alloy additive is fused in the molten steel, also be convenient to the making of core-spun yarn core layer, the iron alloy additive of described sandwich layer is a powder, and the particle diameter of described powder is smaller or equal to 5mm.In addition, but above-mentioned alloy of vanadium nitride, iron alloy additive, fluorite uniform mixing are made the sandwich layer of cored-wire, by sheetmetal or iron sheet parcel sandwich layer, form cored-wire then; Also can be alloy of vanadium nitride and iron alloy additive uniform mixing and make the internal layer of sandwich layer, fluorite is as the skin of sandwich layer, and the crust of being made by sheetmetal or iron sheet in fluorite layer external parcel forms cored-wire then.
In order further to improve the flowability of slag, help cored-wire and feed fast in the molten steel, among the described step B, on one side with cored-wire by the molten steel in the Yarn feeding device feeding ladle, on one side ladle is rocked.If do not contain fluorite in the sandwich layer of cored-wire, rock ladle merely, though also can improve the flowability of slag, DeGrain; Effect by fluorite and slag and to the rocking of ladle, then the flowability of slag obtains fairly obvious improvement, is convenient to feed cored-wire, helps preventing that cored-wire from card line and broken string taking place.
In addition, in order to be convenient to that further cored-wire is fed in the molten steel, among the described step B, on one side with cored-wire by the molten steel in the Yarn feeding device feeding ladle, on one side to cored-wire and the molten steel contact area rare gas element of jetting.By to cored-wire and molten steel contact area winding-up rare gas element, can improve the flowability of the slag in this zone on the one hand, can prevent that on the other hand the slag beyond this zone from compiling towards this zone flows, especially ladle is being rocked in the process, other regional slag might be towards flowing near the cored-wire, by near the rare gas element of cored-wire, jetting, can effectively guarantee the quick feeding of cored-wire, and can prevent that cored-wire from card line or broken string taking place.
Embodiment one:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer is made up of alloy of vanadium nitride and fluorite, the weight proportion of above-mentioned alloy of vanadium nitride and fluorite is: alloy of vanadium nitride: 85%, fluorite: 15%, alloy of vanadium nitride and fluorite all are powder, particle diameter is below the 3mm, the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 12mm.
Embodiment two:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer is made up of alloy of vanadium nitride and fluorite, the weight proportion of above-mentioned alloy of vanadium nitride and fluorite is: alloy of vanadium nitride: 95%, fluorite: 5%, alloy of vanadium nitride and fluorite all are powder, particle diameter is below the 3mm, the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 12mm.
Embodiment three:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer contains alloy of vanadium nitride, fluorite and ferro-vanadium, and the weight proportion of above-mentioned alloy of vanadium nitride and fluorite and ferro-vanadium is: alloy of vanadium nitride: 90%, fluorite: 5%, ferro-vanadium: 5%.Alloy of vanadium nitride, fluorite and ferro-vanadium all are powder, and particle diameter is below the 3mm, and the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 13mm.
Embodiment four:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer contains alloy of vanadium nitride, fluorite and ferro-titanium, and the weight proportion of above-mentioned alloy of vanadium nitride and fluorite and ferro-titanium is: alloy of vanadium nitride: 90%, fluorite: 5%, ferro-titanium: 5%.Alloy of vanadium nitride, fluorite and ferro-titanium all are powder, and particle diameter is below the 3mm, and the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 13mm.
Embodiment five:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer contains alloy of vanadium nitride, fluorite and ferrocolumbium, and the weight proportion of above-mentioned alloy of vanadium nitride and fluorite and ferrocolumbium is: alloy of vanadium nitride: 90%, fluorite: 5%, ferrocolumbium: 5%.Alloy of vanadium nitride, fluorite and ferrocolumbium all are powder, and particle diameter is below the 3mm, and the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 13mm.
Embodiment six:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer contains alloy of vanadium nitride, fluorite, ferrocolumbium and ferro-titanium, the weight proportion of above-mentioned alloy of vanadium nitride, fluorite, ferrocolumbium and ferro-titanium is: alloy of vanadium nitride: 80%, fluorite: 10%, ferrocolumbium: 5%, ferro-titanium: 5%.Alloy of vanadium nitride, fluorite, ferrocolumbium and ferro-titanium all are powder, and particle diameter is below the 3mm, and the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 13mm.
Embodiment seven:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer contains alloy of vanadium nitride, fluorite, ferrocolumbium and ferro-vanadium, the weight proportion of above-mentioned alloy of vanadium nitride, fluorite, ferrocolumbium and ferro-vanadium is: alloy of vanadium nitride: 75%, fluorite: 10%, ferrocolumbium: 5%, ferro-vanadium: 10%.Alloy of vanadium nitride, fluorite, ferrocolumbium and ferro-vanadium all are powder, and particle diameter is below the 3mm, and the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 13mm.
Embodiment eight:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer contains alloy of vanadium nitride, fluorite, ferro-titanium and ferro-vanadium, the weight proportion of above-mentioned alloy of vanadium nitride, fluorite, ferro-titanium and ferro-vanadium is: alloy of vanadium nitride: 75%, fluorite: 10%, ferro-titanium: 5%, ferro-vanadium: 10%.Alloy of vanadium nitride, fluorite, ferro-titanium and ferro-vanadium all are powder, and particle diameter is below the 3mm, and the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 13mm.
Embodiment nine:
Be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer, described sandwich layer contains alloy of vanadium nitride, fluorite, ferro-titanium, ferro-vanadium and ferrocolumbium, the weight proportion of above-mentioned alloy of vanadium nitride, fluorite, ferro-titanium, ferro-vanadium and ferrocolumbium is: alloy of vanadium nitride: 70%, fluorite: 5%, ferro-titanium: 5%, ferro-vanadium: 10%, ferrocolumbium 10%.Alloy of vanadium nitride, fluorite, ferro-titanium, ferro-vanadium and ferrocolumbium all are powder, and particle diameter is below the 3mm, and the sandwich layer external packets is wrapped with the crust that cold rolled strip is made, and the external diameter of whole cored-wire is 13mm.
Claims (10)
1. be used to realize the cored-wire of molten steel vanadium, nitrogen alloying, comprise sandwich layer (2), described sandwich layer (2) contains alloy of vanadium nitride, it is characterized in that: described sandwich layer (2) also contains fluorite.
2. the cored-wire that is used to realize molten steel vanadium, nitrogen alloying as claimed in claim 1 is characterized in that: the alloy of vanadium nitride of described sandwich layer (2) and fluorite all are powder, and the particle diameter of described powder is smaller or equal to 5mm.
3. the cored-wire that is used to realize molten steel vanadium, nitrogen alloying as claimed in claim 1 or 2, it is characterized in that: described sandwich layer (2) also contains the iron alloy additive, described alloy of vanadium nitride, the content of fluorite and iron alloy additive is by weight percentage: alloy of vanadium nitride: 70%～95%, and fluorite: 5%～15%, iron alloy additive: 0～25%, wherein, described iron alloy additive is at least a in the following alloy: ferro-titanium, ferrocolumbium, ferro-vanadium.
4. the cored-wire that is used to realize molten steel vanadium, nitrogen alloying as claimed in claim 3 is characterized in that: the iron alloy additive of described sandwich layer (2) is a powder, and the particle diameter of described powder is smaller or equal to 5mm.
5. be used to realize the method for molten steel vanadium, nitrogen alloying, it is characterized in that may further comprise the steps:
A, make cored-wire, comprise the sandwich layer (2) of making cored-wire and sandwich layer (2) is wrapped to form cored-wire by crust (1), wherein, the sandwich layer of described cored-wire (2) contains alloy of vanadium nitride and fluorite;
B, cored-wire that steps A is made are by the molten steel in the Yarn feeding device feeding ladle.
6. the method that is used to realize molten steel vanadium, nitrogen alloying as claimed in claim 5 is characterized in that: the alloy of vanadium nitride of the sandwich layer in the described steps A (2) and fluorite all are powder, and the particle diameter of described powder is smaller or equal to 5mm.
7. the method that is used to realize molten steel vanadium, nitrogen alloying as claimed in claim 5, it is characterized in that: the sandwich layer in the described steps A (2) also contains the iron alloy additive, described alloy of vanadium nitride, the content of fluorite and iron alloy additive is by weight percentage: alloy of vanadium nitride: 70%～95%, and fluorite: 5%～15%, iron alloy additive: 0～25%, wherein, described iron alloy additive is at least a in the following alloy: ferro-titanium, ferrocolumbium, ferro-vanadium.
8. the method that is used to realize molten steel vanadium, nitrogen alloying as claimed in claim 5 is characterized in that: the iron alloy additive of described sandwich layer (2) is a powder, and the particle diameter of described powder is smaller or equal to 5mm.
9. the method that is used to realize molten steel vanadium, nitrogen alloying as claimed in claim 5 is characterized in that: among the described step B, on one side with cored-wire by the molten steel in the Yarn feeding device feeding ladle, on one side ladle is rocked.
10. as any described method that is used to realize molten steel vanadium, nitrogen alloying in the claim 5 to 9, it is characterized in that: among the described step B, on one side with cored-wire by the molten steel in the Yarn feeding device feeding ladle, on one side to cored-wire and the molten steel contact area rare gas element of jetting.
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| CN2011101210605A CN102212737B (en) | 2011-05-11 | 2011-05-11 | Core-spun thread and method for implementing molten steel vanadium-nitrogen alloying |
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| CN2011101210605A CN102212737B (en) | 2011-05-11 | 2011-05-11 | Core-spun thread and method for implementing molten steel vanadium-nitrogen alloying |
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