CN101693977A - Vanadium-nitrogen additive for smelting microalloyed steel and method for preparing same - Google Patents
Vanadium-nitrogen additive for smelting microalloyed steel and method for preparing same Download PDFInfo
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- CN101693977A CN101693977A CN200910184822A CN200910184822A CN101693977A CN 101693977 A CN101693977 A CN 101693977A CN 200910184822 A CN200910184822 A CN 200910184822A CN 200910184822 A CN200910184822 A CN 200910184822A CN 101693977 A CN101693977 A CN 101693977A
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Abstract
The invention discloses a vanadium-nitrogen additive for smelting microalloyed steel and a method for preparing same. The vanadium-nitrogen additive and the method are characterized in that the vanadium-nitrogen additive is uniformly mixed by vanadium-contained alloy powder, nitrogen increasing agent powder, and adhesive, wherein the mass ratio of the adhesive is 5-12%, the total mass ratio of the vanadium-contained alloy powder and the nitrogen increasing agent powder is 88-95%, and the ratio of V/N is controlled within 0.1-4. The method for preparing the vanadium-nitrogen additive used for smelting microalloyed steel comprises the following steps: mixing the vanadium-contained alloy powder and the nitrogen increasing agent powder by the weight percentage, mechanically and uniformly blending the mixed powders, subsequently adding 5-12% of the adhesive and uniformly mixing the powders again, finally mechanically forming blocks of spherule shapes or other shapes, and preparing the vanadium-nitrogen additive by drying the blocks. The ratio of V/N of molten steel can be controlled within 3.0-5.0 by the vanadium-nitrogen additive, the enhancement effect of the vanadium can be sufficiently played by utilizing the cheap nitrogen element, and the amount of the vanadium is reduced obviously.
Description
Technical field
The invention belongs to the metallurgic auxiliary materials field, relate in particular to a kind of vanadium-nitrogen additive its preparation method of smelting microalloyed steel.
Background technology
Vanadium can be by forming carbon, nitride generation precipitation strength and crystal grain thinning as micro alloying element in steel.Vanadium and nitrogen add jointly in the steel than adding vanadium separately and carry out microalloying and have better strengthening effect, and this is that its strengthening effect obviously improves because the nitride of vanadium has higher stability than the carbide of vanadium, and precipitated phase is small and dispersed more.Nitrogen is a kind of effectively alloying element in the Vanadium Microalloyed Plate Steels, by making full use of cheap nitrogen element, can significantly improve the strengthening effect of Vanadium Microalloyed Plate Steels, reaches the purpose of saving the alloy consumption, reducing cost.
When steel carried out vanadium, nitrogen microalloying, along with nitrogen content is high more, the strengthening effect effect was also obvious more, and when reaching ideal stoicheiometry 3.64, vanadium can be separated out to greatest extent, reaches the ideal strengthening effect.Therefore from the strengthening effect of giving full play to vanadium, the angle of saving microalloy element consumption, should consider that allowing a small amount of solid solution nitrogen in the steel exists with V/N in the v n micro alloying steel than by 3.64 controls, V/N ratio also controlled being made as is slightly less than 3.64.Certainly V/N should not control too smallly than also, and when V/N＜3.0, the solid solution nitrogen content is too high in the steel, the generation adverse influence.
Carry out at present v n micro alloying method mainly contain three kinds, the one, add VN alloy; The 2nd, add vanadium iron and in smelting process, add nitrogen promoter (as adding silicon nitrogen alloy), the 3rd, add vanadium iron and nitrogen flushing in smelting process.The recovery rate of the two kinds of methods in back nitrogen under present processing condition is extremely unstable, causes the final performance inconsistency of product bigger, seldom is used in actual production.It is the method that can stablize the less expensive that carries out v n micro alloying of generally acknowledging at present that first method promptly adds VN alloy.But, even add the higher VN16 VN alloy of nitrogen content, its V/N ratio is also greater than 5, far above ideal V/N than 3.64, because the rate of recovery of vanadium is apparently higher than the rate of recovery of nitrogen when smelting, so when adding the VN16 VN alloy, per 0.01% vanadium can only be brought the nitrogen of about 13ppm in the steel into, V/N ratio in the real adding steel is approximately greater than 7.69, and this just makes a part of strengthening effect of v element fail to bring into play.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of vanadium-nitrogen additive for smelting microalloyed steel and manufacturing process thereof, can be so that the V/N of additive be more reasonable than control, and can make vanadium and nitrogen stably add in the steel, make that the V/N ratio is controlled at 3.0-5.0 in the steel, thereby utilize cheap nitrogen element to give full play to the strengthening effect of vanadium, reduce the consumption of vanadium significantly.
For solving the problems of the technologies described above, vanadium-nitrogen additive for smelting microalloyed steel provided by the invention, by vanadium-containing alloy powder, nitrogen promoter powder and binding agent uniform mixing, described weight of binder ratio is 5～12%, described vanadium-containing alloy powder and nitrogen promoter powder sum part by weight are 88～95%, and wherein the V/N ratio is controlled to be 0.1～4.
Described vanadium-containing alloy powder is ferrovanadium dust or VN alloy powder.
Described nitrogen promoter powder is alpha-silicon nitride powders or silicon nitride manganese powder end or ferro-silicon nitride powder or nitrogenized manganese iron powder.
Described binding agent is water glass or pitch or resin or phosphoric acid salt
The preparation method who the invention provides vanadium-nitrogen additive for smelting microalloyed steel is: vanadium-containing alloy powder and nitrogen promoter powder are mixed in above-mentioned certainweight ratio, even with mechanical thorough mixing, and then add 5～12% binding agent, thorough mixing is even again, at last with mechanical-moulded be the bulk of coccoid or other shape, promptly make vanadium-nitrogen additive after the drying.
Pass through the part by weight of control vanadium-containing alloy powder and nitrogen promoter powder in the vanadium-nitrogen additive of the present invention, V/N ratio in the vanadium-nitrogen additive can be controlled to be 0.1～4, thereby further the V/N ratio with molten steel is controlled at 3.0-5.0, utilize cheap nitrogen element to give full play to the strengthening effect of vanadium, reduce the consumption of vanadium significantly.Because vanadium-containing alloy and nitrogen promoter all are powder, and mix, so increased reaction area, improved metallurgical reaction speed, also improve the homogeneity of microalloy element composition in steel, thereby guaranteed vanadium and nitrogen are stably added in the steel, had the higher and stable rate of recovery.
Embodiment
Vanadium-nitrogen additive of the present invention is a kind of by vanadium-containing alloy powder, nitrogen promoter powder and binding agent uniform mixing composition together, weight of binder ratio wherein is 5～12%, vanadium alloy powder and nitrogen promoter powder sum part by weight are 88～95%, and the V/N ratio is controlled to be 0.1～4.
The vanadium-containing alloy powder is: ferrovanadium dust, VN alloy powder;
The nitrogen promoter powder is: alpha-silicon nitride powders, silicon nitride manganese powder end, ferro-silicon nitride powder, nitrogenized manganese iron powder;
Binding agent is: water glass, pitch, resin, phosphoric acid salt.
For guaranteeing that the V/N ratio is controlled to be 0.1～4, the part by weight of vanadium-containing alloy powder and nitrogen promoter powder can followingly be determined:
Suppose vanadium-containing alloy powder weight ratio X%, the part by weight Y% of nitrogen promoter powder, the V/N in the vanadium-nitrogen additive is m than target value, and weight of binder is than being a%, and the weight ratio of vanadium is V% in the vanadium-containing alloy powder, and the weight ratio of nitrogen is N
1%, the weight ratio of nitrogen is N in the nitrogen promoter powder
2%, then can followingly calculate:
X％+Y％+a％＝1
(X％×V％)/(Y％×N
2％+X％×N
1％)＝m
Solve an equation and obtain:
X％＝(1-a)mN
2/(V-mN
1+mN
2) (％)
Y％＝1-a-(1-a)mN
2/(V+mN
2-mN
1) (％)
The concrete manufacture method of vanadium-nitrogen additive of the present invention is: vanadium-containing alloy powder and nitrogen promoter powder are mixed in above-mentioned certainweight ratio, even with mechanical thorough mixing, and then add 5～12% binding agent, thorough mixing is even again, at last with mechanical-moulded be the bulk of coccoid or other shape, promptly make vanadium-nitrogen additive after the drying, the V/N ratio in the vanadium-nitrogen additive is controlled to be 0.1～4.
Further specify the present invention with embodiment 1-7 below.
The composition proportion of embodiment 1-7 sees Table 1, vanadium-containing alloy powder and the nitrogen promoter powder part by weight by table 1 is mixed, even with mechanical thorough mixing, and then the part by weight of pressing table 1 adds binding agent, thorough mixing is even again, at last with mechanical-moulded be the bulk of coccoid or other shape, promptly make vanadium-nitrogen additive after the drying, the V/N ratio in the vanadium-nitrogen additive is controlled to be 0.1～4.
The composition proportion of table 1 embodiment of the invention 1-7
The present invention uses in reality can obviously reduce content of vanadium, row specific as follows:
When converter smelting HRB400 reinforcing bar is used steel, add-on with embodiment 1 additive is 1.8 kilograms of/ton steel, contain 0.315 kilogram of/ton steel of pure vanadium, its benefit mainly shows: (1) is if with ferro-vanadium (containing 50%V), add-on is 1.40 kilograms of/ton steel, contain 0.70 kilogram of/ton steel of pure vanadium, embodiment 1 can save 0.385 kilogram of/ton steel of pure vanadium; (2) if (contain 80%V, 16%N), add-on is 0.45 kilogram of/ton steel, contains 0.36 kilogram of/ton steel of pure vanadium with the VN16 VN alloy.Though embodiment 2 saves 0.045 kilogram of/ton steel of pure vanadium only, because VN alloy costs an arm and a leg 10-13 unit/ton so use embodiment 2 can reduce production costs.(3) adding 0.63 kilogram/ton of blocky ferro-vanadium when smelting respectively compares for 1.01 kilograms/ton with blocky ferro-silicon nitride, the rate of recovery of embodiment 1 nitrogen is more stable, the content fluctuation of the former nitrogen in steel is very big, be 47ppm-126ppm, and the fluctuation of the content of embodiment 1 nitrogen in steel is less, is 107ppm-113ppm.
When converter smelting HRB500 reinforcing bar is used steel, are 2.2 kilograms of/ton steel, contain 0.889 kilogram of/ton steel of pure vanadium with the add-on of embodiment 2 additives.If (contain 80%V, 16%N), add-on is 1.40 kilograms of/ton steel, contains 1.12 kilograms of/ton steel of pure vanadium, and embodiment 2 can save 0.231 kilogram of/ton steel of pure vanadium with the VN16 VN alloy.
Claims (5)
1. vanadium-nitrogen additive for smelting microalloyed steel, it is characterized in that, described vanadium-nitrogen additive is by vanadium-containing alloy powder, nitrogen promoter powder and binding agent uniform mixing, described weight of binder ratio is 5～12%, described vanadium-containing alloy powder and nitrogen promoter powder sum part by weight are 88～95%, and wherein the V/N ratio is controlled to be 0.1～4.
2. vanadium-nitrogen additive for smelting microalloyed steel as claimed in claim 1 is characterized in that, described vanadium-containing alloy powder is ferrovanadium dust or VN alloy powder.
3. vanadium-nitrogen additive for smelting microalloyed steel as claimed in claim 1 is characterized in that, described nitrogen promoter powder is alpha-silicon nitride powders or silicon nitride manganese powder end or ferro-silicon nitride powder or nitrogenized manganese iron powder.
4. a vanadium-nitrogen additive for smelting microalloyed steel as claimed in claim 1 is characterized in that, described binding agent is water glass or pitch or resin or phosphoric acid salt.
5. as the preparation method of the described vanadium-nitrogen additive for smelting microalloyed steel of one of claim 1 to 4, it is characterized in that, vanadium-containing alloy powder and nitrogen promoter powder are mixed in above-mentioned certainweight ratio, even with mechanical thorough mixing, and then add 5～12% binding agent, thorough mixing is even again, at last with mechanical-moulded be the bulk of coccoid or other shape, promptly make vanadium-nitrogen additive after the drying.
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| CN200910184822A CN101693977A (en) | 2009-10-14 | 2009-10-14 | Vanadium-nitrogen additive for smelting microalloyed steel and method for preparing same |
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| CN102828000A (en) * | 2012-10-08 | 2012-12-19 | 侯巍 | Metallurgical V-N microalloying and compound deoxidation cored wire |
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| CN104017941A (en) * | 2014-06-10 | 2014-09-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloyed steel, cored wire containing iron alloys and iron-calcium alloy, application of cored wire, molten steel and preparation method of molten steel |
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Application publication date: 20100414 |