CN104032080A - Vanadium-containing microalloyed steel, cored wire containing niobium-iron alloy and silicon-calcium alloy, application of cored wire, molten steel and preparation method of molten steel - Google Patents
Vanadium-containing microalloyed steel, cored wire containing niobium-iron alloy and silicon-calcium alloy, application of cored wire, molten steel and preparation method of molten steel Download PDFInfo
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Abstract
The invention provides a cored wire containing a niobium-iron alloy and a silicon-calcium alloy and an application thereof. The cored wire comprises a core and an outer layer wrapping the core, wherein the core is a mixture containing a vanadium-iron alloy, silicon-manganese nitride, the niobium-iron alloy and the silicon-calcium alloy. The invention provides molten steel and a preparation method thereof. The method comprises the step of feeding the cored wire into the molten steel to be subjected to vanadium-nitrogen alloying to carry out vanadium-nitrogen alloying. The invention provides vanadium-containing microalloyed steel. The cored wire is used for achieving vanadium-nitrogen alloying of the molten steel, can effectively increase the nitrogen content according to the requirements, without affecting the vanadium content, and can produce vanadium-containing steel with higher nitrogen content according to the requirement of the molten steel. The vanadium-nitrogen microalloyed steel obtained after casting the vanadium-nitrogen alloyed molten steel obtained by carrying out vanadium-nitrogen alloying on the molten steel by adopting the cored wire has high yield strength, and the relative corrosion rate of steel can not be affected.
Description
Technical field
The present invention relates to a kind of cored-wire and application in molten steel VN alloy thereof containing ferrocolumbium and silicocalcium, and a kind of molten steel and preparation method thereof, and a kind of containing vanadium micro-alloyed steel.
Background technology
Micro-alloyed steel mainly refers to that in steel certain element that adds amount seldom or trace just can obviously carry high performance steel, particularly improves the intensity index of steel.Under prior art condition, micro-alloyed steel mainly obtains by adding seldom amount or trace vanadium, niobium and titanium.The mechanism of action of microalloying is: as micro-vanadium, niobium and titanium, add after molten steel, carbon and nitrogen in molten steel are combined, form carbon, nitrogen compound particle, be V (C, N), Nb (C, N) and Ti (C, N) particle, these particles have certain precipitation strength and the effect of grain refining, can significantly improve the intensity of steel.
Known according to above-mentioned microalloy principle, micro-alloyed steel relates to the chemical element that will control and mainly contains vanadium, niobium, titanium, carbon and nitrogen.Generally in molten steel, do not have vanadium, niobium and titanium elements, the form that conventionally need to add with alloy realizes; Carbon can be by adding certain graphite, hard coal or carbon dust to obtain; Generally the nitrogen in molten steel is the harmful element that does not need existence, but be very important beneficial element at microalloy nitrogen in steel, it is inadequate only relying on nitrogen content residual in molten steel, generally adopt converter smelting steel, residual nitrogen content is within the scope of 0.004%-0.06%, adopt electrosmelting steel, residual nitrogen content, within the scope of 0.06%-0.08%, can be realized by adding nitrogenous class alloy in necessary situation.
In micro-alloyed steel, increasing in early days nitrogen, is to realize by adding the nitrogenize class alloy of 3%-6%, but because nitrogenize class alloy is nitrogenous very low, cause alloy addition large and, recovery rate is unstable, is replaced gradually by the higher alloy of vanadium nitride of nitrogen content.In the production of micro-alloyed steel, be almost difficult to re-use the nitrogenize class alloy of 3%-6% in front, almost all use containing vanadium and nitrogen content high alloy of vanadium nitride again.
Alloy of vanadium nitride mainly contains VN12, VN14 and tri-trades mark of VN16.Generally the ratio of these three trade mark nitrogen and vanadium is basic fixing, is respectively 12:78 (N:V); 14:78 (N:V); 16:78 (N:V), the ratio of nitrogen and vanadium is up to the 16:78 of VN16, in alloy, contains 16% N, contains 78% vanadium.Although alloy of vanadium nitride is high again containing vanadium and nitrogen content, for micro-alloying technology routes, particularly composite micro-alloyed steel different in micro-alloyed steel, V-Ti-N for example, V-Ti-Nb-N, also can not satisfy the demands even.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of cored-wire that contains vanadium and nitrogen for realizing the alloying of molten steel vanadium and nitrogen, in this kind of cored-wire, contained nitrogen is not by obtaining with addition of VN alloy, but by obtaining with addition of other nitrogenous higher nitride separately, and find to use this nitrogenate can't affect the relative corrosion rate of steel.
For realizing aforementioned object, according to a first aspect of the invention, the invention provides a kind of cored-wire containing ferrocolumbium and silicocalcium, this cored-wire comprises: the skin of sandwich layer and the described sandwich layer of parcel, wherein, described sandwich layer is the mixture that contains ferro-vanadium, nitrogenize silicomanganese, ferrocolumbium and silicocalcium.
According to a second aspect of the invention, the invention provides the application of cored-wire of the present invention in molten steel VN alloy.
According to a third aspect of the invention we, the invention provides a kind of preparation method of molten steel, the method comprises: cored-wire of the present invention is fed in the molten steel for the treatment of VN alloy and carries out VN alloy.
According to a forth aspect of the invention, the invention provides the molten steel obtaining according to the preparation method of molten steel of the present invention.
According to a fifth aspect of the invention, the invention provides a kind of vanadium micro-alloyed steel that contains, wherein, should by molten steel casting of the present invention, be formed containing vanadium micro-alloyed steel.
Cored-wire of the present invention, for realizing the alloying of molten steel vanadium and nitrogen, can effectively increase nitrogen content and not affect content of vanadium according to needs, can in the situation that molten steel needs, produce nitrogen content higher containing vanadium steel.And it is high to adopt cored-wire of the present invention to carry out the V-N Microalloy Steel yield strength that obtains after molten steel casting that molten steel VN alloy obtains.
The usefulness of the technology of the present invention is, can be molten steel more nitrogen content is provided, and is adapted to especially produce the composite micro-alloyed steel containing vanadium, titanium and niobium, and the steel obtaining can guarantee that relative corrosion rate remains unchanged substantially and yield strength improves greatly.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the cross section view of cored-wire of the present invention.
Description of reference numerals
1---sandwich layer 2---skin
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
As shown in Figure 1, the invention provides a kind of cored-wire, this cored-wire comprises: the skin 2 of sandwich layer 1 and the described sandwich layer 1 of parcel, wherein, the mixture of described sandwich layer 1 for containing ferro-vanadium, nitrogenize silicomanganese, ferrocolumbium and silicocalcium.
According to cored-wire of the present invention, on the one hand by add nitrogenize silicomanganese in sandwich layer, can improve the nitrogen content of unit sandwich layer, be beneficial to produce nitrogen content higher containing vanadium steel, for example produce containing vanadium 0.06 % by weight, weather resisting steel more than nitrogenous 0.010 % by weight, can avoid the excessive phenomenon of noble metal vanadium that adds to occur, reduce production cost.On the other hand, nitrogenize silicomanganese, ferrocolumbium and silicocalcium add the use properties that does not affect cored-wire, and the rate of recovery of nitrogen is high and stable in preparation VN alloy molten steel, and further, on the basis of same content of vanadium, adopt cored-wire of the present invention to carry out the V-N Microalloy Steel yield strength that obtains after VN alloy molten steel casting that molten steel VN alloy obtains high, corrosion rate can remain unchanged relatively.
According to cored-wire of the present invention, in preferred described mixture, the content of ferro-vanadium is 65-80 % by weight, and the content of nitrogenize silicomanganese is 10-15 % by weight, and the content of ferrocolumbium is 1-10 % by weight, the content 5-15 % by weight of silicocalcium.Adopt aforementioned cored-wire to carry out molten steel VN alloy, can produce nitrogen content higher containing vanadium steel, and the yield strength of the V-N Microalloy Steel obtaining after the VN alloy molten steel casting obtaining is high.
According to cored-wire of the present invention, in preferred described ferro-vanadium, V content is 38-82 % by weight, and all the other are Fe and inevitable other impurity element.(V content is 38.0-45.0 % by weight to the ferro-vanadium that aforementioned ferro-vanadium can be FeV40A for the trade mark, all the other are Fe and inevitable other impurity element), (V content is 48.0-55.0 % by weight to the ferro-vanadium of FeV50A, all the other are Fe and inevitable other impurity element), (V content is 58.0-65.0 % by weight to the ferro-vanadium of FeV60A, all the other are Fe and inevitable other impurity element), the ferro-vanadium of FeV80A (V content is 78.0-82.0 % by weight, and all the other are Fe and inevitable other impurity element).
According to cored-wire of the present invention, described nitrogenize silicomanganese is FeSiMnN, follows the ferrosilicon of minute quantity free iron, not nitrogenize, the mixture that the ferro-silico-manganese of not nitrogenize and inevitably some other impurity element form, and wherein the main component of FeSiMnN is Si
3n
4and Mn
5n
2.For the present invention, in preferred described nitrogenize silicomanganese, N content is 25.0-33.0 % by weight, and Si content is 38.0-45.0 % by weight, and Mn content is 10.0-15.0 % by weight, and all the other are a small amount of Fe and inevitable other impurity element.
According to cored-wire of the present invention, in preferred described ferrocolumbium, Nb+Ta content is 60.0-80.0 % by weight, all the other are Fe and inevitable other impurity element, aforementioned ferrocolumbium can be for example that (Nb+Ta content is 60.0-70.0 % by weight to FeNb60 for the trade mark, all the other are Fe and inevitable other impurity element), the ferrocolumbium of FeNb70 (Nb+Ta content is 70.0-80.0 % by weight, and all the other be Fe and inevitable other impurity element).
According to cored-wire of the present invention, Ca content >=28 % by weight in preferred described silicocalcium, Si content is 55-65 % by weight, all the other are inevitable other impurity element; Can be for example Ca28Si60 (Ca content >=28 % by weight for the trade mark, Si content is 55.0-65.0 % by weight, all the other are inevitable other impurity element), the trade mark is Ca30Si35 (Ca content >=30 % by weight, Si content is 55.0-65.0 % by weight, and all the other are inevitable other impurity element) silicocalcium.
According to cored-wire of the present invention, described sandwich layer for the ease of the mixture that contains ferro-vanadium, nitrogenize silicomanganese, ferrocolumbium and silicocalcium fuses in molten steel fast, also be convenient to the making of the sandwich layer of cored-wire, simultaneously in order to improve the yield strength of V-N Microalloy Steel, the mixture that contains ferro-vanadium, nitrogenize silicomanganese, ferro-niobium and silicocalcium is preferably powder form, more preferably the grain diameter of described powder, below 5mm, is preferably below 2mm, below 3mm and 2-5mm.
According to cored-wire of the present invention, the described skin of preferred described cored-wire is iron sheet or sheetmetal.
The present invention is to the material of described iron sheet or sheetmetal without particular requirement, and it can be selected for the routine of this area, and the present invention is not described in detail at this.
The cored-wire with aforementioned component of the present invention all can be realized object of the present invention, and its preparation method can be selected for the routine of this area, for example, can carry out as follows:
Ferro-vanadium, nitrogenize silicomanganese, ferrocolumbium and silicocalcium are ground to form to powder, then use crust (thereby forming skin of the present invention) for example can be wrapped to form cored-wire for iron sheet or sheetmetal.
In the present invention, the diameter of cored-wire can be selected for the routine of this area, and for the present invention, preferably the external diameter of cored-wire is 10-20mm.
The invention provides the application of a kind of cored-wire of the present invention in preparing molten steel.
The preparation method who the invention provides a kind of molten steel, the method comprises: cored-wire of the present invention is fed in the molten steel for the treatment of VN alloy and carries out VN alloy.
According to the preparation method of molten steel of the present invention, in order to be conducive to cored-wire, feed fast in molten steel, simultaneously in order to improve the yield strength of V-N Microalloy Steel, preferably in carrying out VN alloy process, under dynamic condition, carry out VN alloy, dynamic condition can be by rocking ladle or rotating and realize, for example can be in cored-wire feeds the molten steel in ladle by Yarn feeding device in, ladle is rocked.
According to the preparation method of molten steel of the present invention, wherein, in carrying out VN alloy process, preferably in cored-wire is fed to the molten steel in ladle by Yarn feeding device in, the contact area winding-up rare gas element to cored-wire and molten steel.
In the present invention, rare gas element can be selected for the routine of this area, for example, can be nitrogen and/or argon gas.
According to the preparation method of molten steel of the present invention, by to cored-wire and molten steel contact area winding-up rare gas element, can improve the mobility of the slag in this region on the one hand, can prevent that on the other hand the slag beyond this region from collecting towards this zone flows, can improve the yield strength of V-N Microalloy Steel simultaneously, especially ladle is being rocked in process, the slag in other region is likely towards cored-wire Flow Structure Nearby, by near the rare gas element of jetting cored-wire, can effectively guarantee the quick feeding of cored-wire.
According to the preparation method of molten steel of the present invention, wherein, preferably the speed of cored-wire feeding is 2-10 meter per second.
According to the preparation method of molten steel of the present invention, the molten steel for the treatment of VN alloy described in preferably, for to pass through the molten steel of carbon, silicon, alloying of manganese, is preferably the molten steel that passes through carbon, silicon, manganese, chromium, copper and mickel alloying.
According to of the present invention preferred embodiment a kind of, treat that the temperature of the molten steel of VN alloy is 1560-1600 ℃ described in preferably.
The invention provides the molten steel obtaining according to the preparation method of molten steel of the present invention.
The invention provides a kind of vanadium micro-alloyed steel that contains, wherein, should by molten steel casting of the present invention, be formed containing vanadium micro-alloyed steel.
Below in conjunction with embodiment, the present invention is further described, but can not therefore limit the scope of the invention.
In the present invention, nitrogen content records as follows: molten steel is directly got
above pole sample, the cooling post-treatment of sample to be tested becomes
oxygen nitrogen instrument roundlet rod standard, on oxygen nitrogen instrument, measure nitrogen content, the concrete measuring method of nitrogen is pressed the requirement of GB/T20124 (iron and steel, the mensuration of nitrogen content, rare gas element melting heat inducing defecation by enema and suppository) and is carried out.
Content of vanadium records as follows: molten steel is directly got
the cake sample of left and right, after sample to be tested is cooling at any one plane emery wheel scale removal, and polish flat, on spark discharge Atomic Emission SpectrometerAES, by the requirement of GB/T4336 (carbon steel and middle-low alloy steel spark source atomic emission spectrometry analytical procedure), test.
The content of all the other elements can also adopt the method for prior art to measure, the present invention to this without particular requirement.
In the present invention, tensile property carries out according to GB/T228 (metallic substance tensile test at room temperature method), detects yield strength ReL.
In the present invention, the measuring method of the relative corrosion rate of steel is: the rectangle that steel is processed into 60mm * 40mm * 4mm, requiring the surfaceness of largest face is 3.2 μ m, then according to TB/T2375-1993 < < railway, by the method for stipulating in weathering steel period soaking corrosion corrosion test method > >, measures.Specifically condition determination is, test temperature: 45 ± 1 ℃; Relative humidity: 70% ± 5 ℃; Testing liquid: 10-2mol/L NaHSO
3; Test period: 72h, infiltrates the every 60min of 12min/; Test plate (panel) hot face temperature: 70 ℃; Mensuration compared steel is Q345.
In the present invention, the powder of target particles particle diameter can will be sieved and be obtained by standard sieve after crushing material.
Embodiment 1
A kind of cored-wire A1 (external diameter is 13mm), the skin that comprises sandwich layer and parcel sandwich layer, described sandwich layer is by ferro-vanadium, nitrogenize silicomanganese, the powder of ferrocolumbium and silicocalcium (grain diameter is that 2mm is following) forms, the outer crust of making for cold rolled strip (trade mark St12), wherein, in powder, contain ferro-vanadium (FeV50A, V content is 50.0 % by weight, all the other are Fe and inevitable other impurity element): 80 % by weight, (N content is 28 % by weight to nitrogenize silicomanganese, Si content is 40 % by weight, Mn content is 10 % by weight, all the other are a small amount of Fe and inevitable other impurity element): 10 % by weight, ferrocolumbium (FeNb60, Nb+Ta content is 65 % by weight, all the other are Fe and inevitable other impurity element): 5 % by weight, silicocalcium (Ca28Si60, Ca content is 28 % by weight, Si content is 60 % by weight, all the other are inevitable other impurity element): 5 % by weight.
Embodiment 2
A kind of cored-wire A2 (external diameter is 13mm), the skin that comprises sandwich layer and parcel sandwich layer, described sandwich layer is by ferro-vanadium, nitrogenize silicomanganese, the powder of ferrocolumbium and silicocalcium (grain diameter is that 2mm is following) forms, the outer crust of making for cold rolled strip (trade mark St12), wherein, in powder, contain ferro-vanadium (FeV50A, V content is 50.0 % by weight, all the other are Fe and inevitable other impurity element): 65 % by weight, (N content is 28 % by weight to nitrogenize silicomanganese, Si content is 40 % by weight, Mn content is 10 % by weight, all the other are a small amount of Fe and inevitable other impurity element): 15 % by weight, ferrocolumbium (FeNb60, Nb+Ta content is 65 % by weight, all the other are Fe and inevitable other impurity element): 10 % by weight, silicocalcium (Ca28Si60, Ca content is 28 % by weight, Si content is 60 % by weight, all the other are inevitable other impurity element): 10 % by weight.
Embodiment 3
A kind of cored-wire A3 (external diameter is 12mm), the skin that comprises sandwich layer and parcel sandwich layer, described sandwich layer is by ferro-vanadium, nitrogenize silicomanganese, the powder of ferrocolumbium and silicocalcium (grain diameter is that 2mm is following) forms, the outer crust of making for cold rolled strip (trade mark St12), wherein, in powder, contain ferro-vanadium (FeV50A, V content is 50.0 % by weight, all the other are Fe and inevitable other impurity element): 74 % by weight, (N content is 28 % by weight to nitrogenize silicomanganese, Si content is 40 % by weight, Mn content is 10 % by weight, all the other are a small amount of Fe and inevitable other impurity element): 10 % by weight, ferro-niobium (FeNb60, Nb+Ta content is 65 % by weight, all the other are Fe and inevitable other impurity element): 1 % by weight, silicocalcium (Ca28Si60, Ca content is 28 % by weight, Si content is 60 % by weight, all the other are inevitable other impurity element): 15 % by weight.
Embodiment 4
A kind of cored-wire A4 (external diameter is 12mm), the skin that comprises sandwich layer and parcel sandwich layer, described sandwich layer is by ferro-vanadium, nitrogenize silicomanganese, the powder of ferrocolumbium and silicocalcium (grain diameter is that 2mm is following) forms, the outer crust of making for cold rolled strip (trade mark St12), wherein, in powder, contain ferro-vanadium (FeV50A, V content is 50.0 % by weight, all the other are Fe and inevitable other impurity element): 73 % by weight, (N content is 28 % by weight to nitrogenize silicomanganese, Si content is 40 % by weight, Mn content is 10 % by weight, all the other are a small amount of Fe and inevitable other impurity element): 12 % by weight, ferrocolumbium (FeNb60, Nb+Ta content is 65 % by weight, all the other are Fe and inevitable other impurity element): 10 % by weight, silicocalcium (Ca28Si60, Ca content is 28 % by weight, Si content is 60 % by weight, all the other are inevitable other impurity element): 5 % by weight.
Comparative example 1
Identical with the cored-wire of embodiment 2, different, the sandwich layer of cored-wire D1 is the FeV50A ferro-vanadium powder of 100 % by weight.
Preparation example
Adopt cored-wire A1-A4 to produce C content 0.08-0.12 % by weight on 120 tons of converter+120 ton LF stove refining furnace+6 machine, 6 stream billet casters, Si content 0.15-0.35 % by weight, Mn content 1.15-1.40 % by weight, Cr content 0.20-0.60 % by weight, Ni content 0.15-0.35 % by weight, Cu content 0.20-0.60 % by weight, content of vanadium 0.09-0.15 % by weight, acid molten aluminium (Als) 0.01-0.04 % by weight, nitrogen content is not less than the YQ450NQR1 high-strength weathering steel of 0.0100 % by weight, specifically carries out as follows:
First in converter, add 140 tons of molten iron, utilize the function of the de-C of Converter Oxigen Blowing, molten iron is just smelt to molten steel, and the C in molten steel taps in ladle when just refining is to 0.03 % by weight, and now actual tap is 133 tons (in the first refining process of converter, the raw material of approximately 5 % by weight is burnt).In tapping process, in molten steel, add FeSi, FeMn and FeCr, and nickel plate, copper coin and aluminium cake (or feeding aluminum steel by feeding wire machine) to carry out Si, Mn, Cr, Ni, Cu and Al element alloyed, after alloying, in molten steel, Si content is 0.27 % by weight, Cr content is 0.30 % by weight, Ni content is 0.20 % by weight, Cu content is 0.30 % by weight, Als content is 0.25 % by weight, C content is that 0.10 % by weight is (owing to containing certain carbon in FeMn, after adding FeMn, carbon content increases to some extent), now in molten steel, sample, after the sample of taking-up is cooling, be reprocessed into
oxygen nitrogen instrument roundlet rod standard, the nitrogen content of measuring on oxygen nitrogen instrument in molten steel is 0.0050 % by weight.
Molten steel starts electrically heated after arriving LF stove, when being heated to 1580 ℃, liquid steel temperature stops heating, with feeding wire machine feeding cored-wire, also rock ladle simultaneously, contact area winding-up rare gas element (rare gas element is nitrogen) to cored-wire and molten steel simultaneously, to prepare the weather-proof molten steel of VN alloyization of required vanadium nitrogen content; Then on 6 machine 6 stream billet casters, the weather-proof molten steel of VN alloyization is cast into 360mm * 450mm strand, after rolling, become a useful person for thickness 14mm, profile be " second " font containing the weather-proof microalloy shaped steel of vanadium, its nitrogen content and content of vanadium, the relative corrosion rate that embodies weather resistance, yield strength is in Table 1.
Preparation comparative example
Method according to preparation example is prepared Finished Steel, different, uses cored-wire D1 to be prepared.
Data by table 1 can find out, cored-wire of the present invention is for realizing the alloying of molten steel vanadium and nitrogen, can in the situation that molten steel needs, produce nitrogen content higher containing vanadium steel.And it is high to adopt cored-wire of the present invention to carry out the yield strength of the vanadium nitrogen microalloy weathering steel that obtains after the weather-proof molten steel casting of VN alloyization that molten steel VN alloy obtains, for example contrast preparation comparative example 1 is known with the result of preparation example 2 and preparation example 4, for obtaining the suitable Finished Steel of fundamental property (comprising yield strength and relative corrosion rate), adopt the required content of vanadium of steel that cored-wire alloying of the present invention obtains greatly to reduce, this greatly reduces production cost undoubtedly; And for example contrast preparation comparative example 1 is known with the result of preparation example 1 and preparation example 3, adopt the steel that cored-wire alloying of the present invention obtains not increasing under the prerequisite of content of vanadium, can increase nitrogen content, and the Finished Steel yield strength obtaining is higher, corrosion rate can remain unchanged relatively.
Table 1
In table 1, be all at C content, Mn content, under Si content, Cr content, the Ni content condition identical with Cu content, the contrast situation of the performance data of each Finished Steel and V and N content.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (13)
1. containing a cored-wire for ferrocolumbium and silicocalcium, this cored-wire comprises: the skin of sandwich layer and the described sandwich layer of parcel, it is characterized in that, and described sandwich layer is the mixture that contains ferro-vanadium, nitrogenize silicomanganese, ferrocolumbium and silicocalcium.
2. cored-wire according to claim 1, wherein, in described mixture, the content of ferro-vanadium is 65-80 % by weight, and the content of nitrogenize silicomanganese is 10-15 % by weight, and the content of ferrocolumbium is 1-10 % by weight, the content 5-15 % by weight of silicocalcium.
3. cored-wire according to claim 1 and 2, wherein, in described ferro-vanadium, V content is 38-82 % by weight, all the other are Fe and inevitable other impurity element.
4. cored-wire according to claim 1 and 2, wherein, in described nitrogenize silicomanganese, N content is 25-33 % by weight, and Si content is 38-45 % by weight, and Mn content is 10-15 % by weight, and all the other are a small amount of Fe and inevitable other impurity element.
5. cored-wire according to claim 1 and 2, wherein, in described ferrocolumbium, Nb+Ta content is 60-80 % by weight, all the other are Fe and inevitable other impurity element.
6. cored-wire according to claim 1 and 2, wherein, Ca content >=28 % by weight in described silicocalcium, Si content is 55-65 % by weight, all the other are inevitable other impurity element.
7. cored-wire according to claim 1 and 2, wherein, described mixture is powder form, and the grain diameter of described powder is below 5mm, and the described skin of cored-wire is iron sheet or sheetmetal.
8. the application of the cored-wire described in any one in preparation VN alloy molten steel in claim 1-7.
9. a preparation method for molten steel, the method comprises: the cored-wire feeding described in any one in claim 1-7 is treated in the molten steel of VN alloy, carry out VN alloy.
10. preparation method according to claim 9, wherein, described in treat VN alloy molten steel be the molten steel of carbon silicomanganese, and described in treat that the temperature of the molten steel of VN alloy is 1560-1600 ℃.
11. according to the preparation method described in claim 9 or 10, wherein, carries out VN alloy under dynamic condition, and when cored-wire feeds in the molten steel for the treatment of VN alloy, the contact area winding-up rare gas element to cored-wire and described molten steel.
The molten steel that method in 12. claim 9-11 described in any one obtains.
13. 1 kinds contain vanadium micro-alloyed steel, it is characterized in that, should by the molten steel casting described in claim 12, be formed containing vanadium micro-alloyed steel.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104032085A (en) * | 2014-06-13 | 2014-09-10 | 攀钢集团研究院有限公司 | Microalloyed weathering steel, cored wire containing iron alloys and silicon-calcium alloy, application of cored wire, molten steel and preparation method of molten steel |
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| JPS5340615A (en) * | 1976-09-27 | 1978-04-13 | Sumitomo Metal Ind Ltd | Steel nitriding agent |
| CN101693977A (en) * | 2009-10-14 | 2010-04-14 | 马鞍山钢铁股份有限公司 | Vanadium-nitrogen additive for smelting microalloyed steel and method for preparing same |
| CN102828000A (en) * | 2012-10-08 | 2012-12-19 | 侯巍 | Metallurgical V-N microalloying and compound deoxidation cored wire |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104032085A (en) * | 2014-06-13 | 2014-09-10 | 攀钢集团研究院有限公司 | Microalloyed weathering steel, cored wire containing iron alloys and silicon-calcium alloy, application of cored wire, molten steel and preparation method of molten steel |
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