CN104357614A - Ferro-silicon nitride alloy core-spun wire and production method thereof - Google Patents
Ferro-silicon nitride alloy core-spun wire and production method thereof Download PDFInfo
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Abstract
The invention discloses a ferro-silicon nitride alloy core-spun wire and a production method thereof, belonging to the technical field of core-spun wires. The ferro-silicon nitride alloy core-spun wire is formed by coating core powder with a steel belt, wherein the core powder comprises the following components in parts by mass: 70-95 parts of ferro-silicon nitride alloy, 4.9-29.7 parts of nitrogen-fixation alloy element ferric alloy, and 0.1-0.3 part of silicon-based rare earth alloy powder. The production method of the ferro-silicon nitride alloy core-spun wire comprises the following steps: preparing the ferro-silicon nitride alloy; preparing nitrogen-fixation alloy element ferric alloy; preparing silicon-based rare earth alloy powder; preparing the core powder; coating the core powder with the steel belt, namely coating the core powder by adopting the steel belt with the thickness of 0.34-0.45mm to obtain the core-spun wire with the diameter of 9-13mm. According to the ferro-silicon nitride alloy core-spun wire and the production method thereof, the nitrogen fixation effect and action can be obviously improved, the yield of nitrogen element in molten steel can be greatly increased, and the deficiency existing when the core-spun wire made of nitrogen-containing materials in the prior art serves as a nitrogen enhancement fortifier during production of microalloy steel can be overcome.
Description
Technical field
The invention belongs to the cored wire technology field that the nitrogen pick-up of ferrous metallurgy V-bearing microalloyed steel steelmaking process furnace outer refining process improves steel alloy intensity, particularly relate to a kind of ferro-silicon nitride alloy claded wire and preparation method thereof.Make nitrogen pick-up reinforcer production field at V-bearing microalloyed steel, RHB400 and more than RHB400E rank high-strength screw-thread steel and silicon steel to have broad application prospects.
Background technology
Usually add in micro-alloyed steel production process and there is the trace elements such as V, Nb, Al, Ti that crystal grain thinning and Precipitation pretend, after making steel hot rolling, obtain high strength, high weldability and good processability.Weak point is that micro-V, Nb, Al, Ti of adding in steel are expensive, and its production cost is remained high, simultaneously because Al, Ti belong to active element, oxygen reaction in Yi Yugang generates high-melting-point oxide inclusion, be difficult to remove, thus pollute molten steel, affect continuous casting and normally produce.
21st century removes, steel mill starts to promote the use of VN alloy and substitutes vanadium iron, ferrocolumbium, because C atom in N, the V in VN alloy and steel forms high-melting-point, high strength carbon compound, nitride and carbonitride, crystal grain thinning and Precipitation are pretended with more obvious than trace element effects such as V, Nb, Al, Ti, effectively can reduce micro-V, Nb, Al, Ti add-on, reduce micro-alloyed steel production cost.Thus VN alloy is as the most economical effective additive of a kind of high-strength low-alloy steel, is widely used in the steel such as non-hardened and tempered steel, high-strength thick H profile steel, tool steel, high-strength hot rolled ribbed steel bar and produces.But harsh to temperature control requirement in VN alloy production process, complex manufacturing, and also investment is large, and quality product and stability are not high, cause VN alloy price up to more than 10 ten thousand yuan/ton, are unfavorable for that steel mill taps the latent power and fall this.Meanwhile, because of the restriction of VN alloy production technique, in alloy, N maximum level only has 14%, and thus only have 35.5% vanadium to form V (N, C), in steel, a large amount of V does not play the effect of precipitation strength and inhibiting grain growth, and in steel, V waste is larger.
Based on the strengthening precipitation effect of N element in V-alloyed steel, in order to improve the utilization ratio of V in V-alloyed steel, further reduction production cost, as: the material that nitrogenize silicomanganese, chromium nitride, titanium nitride, aluminium nitride etc. are rich in N (N content is 20%) is used for doing a nitrogen promoter use in micro-alloyed steel, makes progress with the applied research of the utilization ratio improving micro alloying element V.Nitride material mainly to adopt after stove feed postition together with deoxygenated alloy as the nitrogen pick-up reinforcer of V-alloyed steel, and shape is the same with alloy profile is block, and granularity is 5-50mm.But because the materials such as chromium nitride, titanium nitride, aluminium nitride exist following shortcoming: 1) on the high side, generally at 15000 yuan/more than t, cause micro-alloyed steel production cost higher; 2) in single nitrogenous material, chromium, titanium, aluminium belong to ripple metal of living, add with alloy form after stove, because volume density is little, swim in molten steel surface, fixed nitrogen alloying element very easily scaling loss and by oxidation loss in molten steel, the significantly loss of fixed nitrogen alloying element, N loss through volatilization is large, and nitrogen fixation effect is bad, and molten steel nitrogen increased amount is few, nitrogen recovery rate instability (generally at 0-25%), the strengthening effect of N is limited; 3) higher in nitrogenous material titanium, aluminium content, react with oxygen in steel the oxide inclusion produced, and fusing point is high, viscosity is large, be difficult to float, pollute large to steel quality, affect continuous casting and the shortcoming such as normally to cast, thus limit the practical application of these nitrogenous material in micro-alloyed steel production.
Shortcoming is there is as the nitrogen pick-up reinforcer of V-alloyed steel with alloy feed postition for solving the material such as chromium nitride, titanium nitride, aluminium nitride, nitriding silicon-manganese alloy particle is made alloy claded wire, and the technology added in molten steel in line feeding mode when LF refining as V-alloyed steel nitrogen pick-up reinforcer succeeds at production RHB400E V-alloyed steel.Due to the effect of steel medium trace element V, in steel, N recovery rate significantly improves 40%, the precipitation strength effect of nitrogen is more obvious, under equal manufacturing condition, after feeding nitriding silicon-manganese alloy cored-wire in steel, the mechanical performance index such as the surrender of RHB400E steel, tension, unit elongation produced is better than the RHB400E adopting vanadium micro-alloying explained hereafter, can reduce vanadium alloy more than 20%.But the silicon in nitriding silicon-manganese alloy, manganese easily react with steel water oxygen, do not contain in steel or content few V, Nb, Al, Ti nitrogen killer, the silicon in nitrogenize silicomanganese, manganese almost do not have nitrogen fixation.Therefore, adopt nitriding silicon-manganese alloy line do nitrogen pick-up reinforcer be only confined on production V-alloyed steel as: RHB400E steel grade uses, add that nitriding silicon-manganese alloy price is up to 15000 yuan/t, it is not obvious that this advantage falls in production micro-alloyed steel, promotes the use of be restricted in steel mill.
Related art scheme is had open about cored-wire, as: Chinese Patent Application No. 201210377151.X, October 8 2012 applying date, invention disclosed name was called: the technical scheme of the cored-wire of a kind of metallurgy v n micro alloying and complex deoxidization; Chinese Patent Application No. 201410131544.1, April 3 2014 applying date, invention disclosed name was called: the technical scheme of Vanadium Microalloyed Plate Steels nitrogen pick-up nitrogenize silicomanganese cored-wire; Chinese Patent Application No. 201320280835.8, May 22 2013 applying date, invention disclosed name was called: the technical scheme of the cored-wire of a kind of metallurgy v n micro alloying and complex deoxidization.But, technical scheme disclosed in above-mentioned patent document is taped the latent power to fall for iron and steel enterprise and originally also be there is certain space, its key technical problem is: the recovery rate of nitrogen element in molten steel is low, causes nitrogenous material to make alloy and cored-wire and in micro-alloyed steel is produced, makes nitrogen pick-up reinforcer use Shortcomings.
Summary of the invention
1. invent the technical problem that will solve
The object of the invention is to overcome nitrogenous material and make nitrogen pick-up reinforcer use existence done by cored-wire deficiency in micro-alloyed steel production, provide a kind of ferro-silicon nitride alloy claded wire and preparation method thereof, adopt technical scheme of the present invention, nitrogen fixation effect and effect be improved significantly, the recovery rate of nitrogen element in molten steel improves greatly.
2. technical scheme
For achieving the above object, technical scheme provided by the invention is:
One, a kind of ferro-silicon nitride alloy claded wire of the present invention, this ferro-silicon nitride alloy claded wire is formed by the coated core powder of steel band, described core powder is made up of ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy, wherein: each components in mass portion of core powder is composed as follows: ferro-silicon nitride alloy 70-95 part, fixed nitrogen alloying element iron alloy 4.9-29.7 part, silicon base lanthanon powdered alloy 0.1-0.3 part, above-mentioned fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are used for nitrogen element to be fixed in molten steel.
Further, described fixed nitrogen alloying element iron alloy is one or more the mixing in ferro-vanadium, ferrocolumbium, ferroaluminium, ferro-titanium.The present invention selects ferro-vanadium, ferrocolumbium, ferroaluminium, ferro-titanium as fixed nitrogen alloying element iron alloy, and coordinate silicon base lanthanon powdered alloy to devise new formula, cored-wire of the present invention is made both to have reduced the probability reacted with oxygen in steel, stability is better, nitrogen fixation effect is more obvious with effect, N recovery rate, more than 40%, again reduces the use cost of nitrogen pick-up reinforcer, and ton steel can cost declining 5-60 unit.As the breakthrough point that the present invention gives prominence to, the present invention adopts fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy by achieving the best fixed action of nitrogen element in molten steel, the recovery rate of nitrogen element in molten steel is guaranteed, change fixed nitrogen mode of the prior art completely, the present invention proposes the fixed nitrogen mode of innovation, this is patent applicant organizational technology expert years of researches achievements.
Further, described ferro-silicon nitride alloy by particle diameter for≤0.5mm, 0.5-1mm, 1-3mm powder forms, wherein the powder of particle diameter≤0.5mm accounts for the 5-10% of ferro-silicon nitride alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 80-90% of ferro-silicon nitride alloy total mass, and the powder of particle diameter 1-3mm accounts for the 5-10% of ferro-silicon nitride alloy total mass.Described fixed nitrogen alloying element iron alloy by particle diameter for≤0.5mm, 0.5-1mm, 1-2mm powder forms, wherein the powder of particle diameter≤0.5mm accounts for the 5-10% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 80-90% of fixed nitrogen alloying element iron alloy total mass, and the powder of particle diameter 1-2mm accounts for the 5-10% of fixed nitrogen alloying element iron alloy total mass.Described silicon base lanthanon powdered alloy by particle diameter for≤0.5mm, 0.5-1mm powder forms, wherein the powder of particle diameter≤0.5mm accounts for the 10-25% of silicon base lanthanon powdered alloy total mass, and the powder of particle diameter 0.5-1mm accounts for the 75-90% of silicon base lanthanon powdered alloy total mass.
In the present invention, ferro-silicon nitride alloy is≤0.5mm by particle diameter, 0.5-1mm, 1-3mm powder forms, fixed nitrogen alloying element iron alloy is≤0.5mm by particle diameter, 0.5-1mm, 1-2mm powder forms, silicon base lanthanon powdered alloy is≤0.5mm by particle diameter, 0.5-1mm powder forms, this is gordian technique means of the present invention, general cored-wire only makes a search in component, applicant finds in component, to consider that the how best fixed nitrogen of cored-wire cannot realize merely, the present invention's innovation propose cooperation by component and by designing the granularity of each component, reduce the probability reacted with oxygen in steel, stability is better, nitrogen fixation effect is more obvious with effect, N recovery rate is more than 40%.
Its two, the making method of a kind of ferro-silicon nitride alloy claded wire of the present invention, the steps include:
Step one, ferro-silicon nitride alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation ferro-silicon nitride alloy, use vibratory screening apparatus that ferro-silicon nitride alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-3mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for the 5-10% of ferro-silicon nitride alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 80-90% of ferro-silicon nitride alloy total mass, the powder of particle diameter 1-3mm accounts for the 5-10% of ferro-silicon nitride alloy total mass, ferro-silicon nitride alloy is obtained after batching mixing, for subsequent use;
Step 2, fixed nitrogen alloying element iron alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation in fixed nitrogen alloying element iron alloy, use vibratory screening apparatus that fixed nitrogen alloying element iron alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-2mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for the 5-10% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 80-90% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 1-2mm accounts for the 5-10% of fixed nitrogen alloying element iron alloy total mass, fixed nitrogen alloying element iron alloy is obtained after batching mixing, for subsequent use;
Step 3, silicon base lanthanon powdered alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation silicon base lanthanon alloy, use vibratory screening apparatus that silicon base lanthanon alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for the 10-25% of silicon base lanthanon powdered alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 75-90% of silicon base lanthanon powdered alloy total mass, silicon base lanthanon powdered alloy is obtained after batching mixing, for subsequent use;
The preparation of step 4, core powder
Take step one to the ferro-silicon nitride alloy 70-95 part in step 3, fixed nitrogen alloying element iron alloy 4.9-29.7 part, silicon base lanthanon powdered alloy 0.1-0.3 part by mass fraction, ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are mixed to get core powder;
The coated core powder of step 5, steel band
Employing thickness is that the core powder in step 4 is overmolding to the cored-wire that diameter is 9-13mm by the steel band of 0.34-0.45mm, obtains ferro-silicon nitride alloy claded wire.
Further, the fixed nitrogen alloying element iron alloy in step 2 is one or more the mixing in ferro-vanadium, ferrocolumbium, ferroaluminium, ferro-titanium.
3. beneficial effect
Adopt technical scheme provided by the invention, compared with prior art, there is following unusual effect:
(1) a kind of ferro-silicon nitride alloy claded wire of the present invention, its core powder is made up of ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy, wherein fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are used for nitrogen element to be fixed in molten steel, cored-wire of the present invention is by the innovative design of core powder component, make nitrogen fixation effect and effect be improved significantly, the recovery rate of nitrogen element in molten steel improves greatly, overcomes nitrogenous material in prior art and makes nitrogen pick-up reinforcer use existence done by cored-wire deficiency in micro-alloyed steel production;
(2) making method of a kind of ferro-silicon nitride alloy claded wire of the present invention, by to component ferro-silicon nitride alloy in core powder, the granularity of fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy does unique design, and it is composed as follows to control each components in mass portion of core powder: ferro-silicon nitride alloy 70-95 part, fixed nitrogen alloying element iron alloy 4.9-29.7 part, silicon base lanthanon powdered alloy 0.1-0.3 part, adopt steel band that core powder is overmolding to the cored-wire that diameter is 9-13mm, can at ar blowing refining station, LF ladle furnace uses, the existing wire-feeding device comprising straightening wire-leading device of steel mill can be made full use of, by cored-wire is fed molten steel deep, under the effect of Argon gas strong stirring, larger with steel contacts area, N distributes more even in molten steel, nitrogen fixation effect is better, the recovery rate of N is higher.
Embodiment
For understanding content of the present invention further, below in conjunction with embodiment, the invention will be further described.
Embodiment 1
The making method of a kind of ferro-silicon nitride alloy claded wire of the present embodiment, its concrete step is:
Step one, ferro-silicon nitride alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation ferro-silicon nitride alloy, use vibratory screening apparatus that ferro-silicon nitride alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-3mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 7% of ferro-silicon nitride alloy total mass, the powder of particle diameter 0.5-1mm accounts for 85% of ferro-silicon nitride alloy total mass, the powder of particle diameter 1-3mm accounts for 8% of ferro-silicon nitride alloy total mass, ferro-silicon nitride alloy is obtained after batching mixing, for subsequent use.In the present embodiment ferro-silicon nitride alloy composition in require that the mass percent of element is: N >=30%, Si >=50%.
Step 2, fixed nitrogen alloying element iron alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation in fixed nitrogen alloying element iron alloy, use vibratory screening apparatus that fixed nitrogen alloying element iron alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-2mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 8% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 0.5-1mm accounts for 85% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 1-2mm accounts for 7% of fixed nitrogen alloying element iron alloy total mass, fixed nitrogen alloying element iron alloy is obtained after batching mixing, for subsequent use.In the present invention, fixed nitrogen alloying element iron alloy can be one or more the mixing in ferro-vanadium, ferrocolumbium, ferroaluminium, ferro-titanium, requires that the mass percent of element is: V >=50% in the composition of ferro-vanadium; Require in the composition of ferrocolumbium that the mass percent of element is: Nb >=60%; Require in the composition of ferroaluminium that the mass percent of element is: Al >=95%; Require in the composition of ferro-titanium that the mass percent of element is: Ti >=30%.Fixed nitrogen alloying element iron alloy in the present embodiment adopts ferro-vanadium.
Step 3, silicon base lanthanon powdered alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation silicon base lanthanon alloy, use vibratory screening apparatus that silicon base lanthanon alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 20% of silicon base lanthanon powdered alloy total mass, the powder of particle diameter 0.5-1mm accounts for 80% of silicon base lanthanon powdered alloy total mass, silicon base lanthanon powdered alloy is obtained after batching mixing, for subsequent use.In the present embodiment silicon base lanthanon powdered alloy composition in require that the mass percent of element is: RE is 30-35%, Si is 30-35%.
The preparation of step 4, core powder
Take step one to the ferro-silicon nitride alloy in step 3 83 parts, 17 parts, fixed nitrogen alloying element iron alloy, silicon base lanthanon powdered alloy 0.2 part by mass fraction, ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are mixed to get core powder.In the present embodiment, ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy mixing process are specific as follows: first the half of the silicon base lanthanon powdered alloy weight taken joined in fixed nitrogen alloying element iron alloy, are uniformly mixed to obtain rare earth-fixed nitrogen alloy mixture in stirrer; Then second half of the silicon base lanthanon powdered alloy weight taken is joined in ferro-silicon nitride alloy, in stirrer, be uniformly mixed to obtain rare earth-ferro-silicon nitride mixture; Again above-mentioned rare earth-fixed nitrogen alloy mixture and rare earth-ferro-silicon nitride mixture are placed in stirrer and are uniformly mixed to obtain core powder.Adopt such mix and blend technique, fully can ensure the mixed effect of ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy, silicon base lanthanon powdered alloy three, and place mat effect can be played for silicon base lanthanon powdered alloy plays a role in molten steel.
The coated core powder of step 5, steel band
Employing thickness is that the core powder in step 4 is overmolding to the cored-wire that diameter is 13mm by the steel band of 0.40mm, obtains ferro-silicon nitride alloy claded wire.Obtained ferro-silicon nitride alloy claded wire requires its core powder rice weight >=200g/m, the meter Chong Liang >=390g/m of ferro-silicon nitride alloy claded wire, and specifically core powder rice weight is 210g/m in the present embodiment, and the meter Chong Liang of ferro-silicon nitride alloy claded wire is 395g/m.
When producing RHB400 steel, after converter tapping alloying, ferro-silicon nitride alloy claded wire prepared by the present embodiment is fed by feeding wire machine at ar blowing refining station, feed quantity presses the feeding of 3.4m/ ton steel, the nitrogen fixation effect of the present embodiment and effect be improved significantly, the recovery rate of nitrogen element in molten steel improves greatly.Cheap ferro-silicon nitride alloy (price is lower than 8500 yuan/t) is selected to make main nitrogen pick-up strengthening material in the present embodiment, add the fixed nitrogen that specific fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy make N in ferro-silicon nitride to use, reach deoxidation simultaneously, sweetening power is strong, inclusion morphology control ability is strong, crystal grain thinning and dispersion-strengthened action obviously, can improve structure of steel performance effectively.The present embodiment employing intensity is high, the high-quality mild-carbon steel strip of good toughness, control covering machine speed and be overmolding to that density is high, core powder full (core powder rice weight >=200g/m), intensity and good toughness, diameter, at the alloy core wire of Ф 9-13mm, is applicable to steel mill's feeding wire machine and uses.The nitrogen killer of good stability is added with in cored-wire of the present invention, can use containing on V, Nb, Al, Ti trace nitrogen killer steel grade in production, also can such as: RHB400 etc. do not use containing on micro-nitrogen killer steel grade, N recovery rate Absorbable organic halogens is more than 40%, pretend in the precipitation of nitrogen and use and rare earth fining crystal grain, under dispersion-strengthened action, greatly can improve the microstructure and mechanical property of steel, thus V-alloyed steel alloy dosage more than 25% can be reduced, do not contain manganese in the steel such as the RHB400 of vanadium and can fall more than 20.Have suitability than nitrogenize silicomanganese cored-wire stronger, the steel grade that application is produced is wider, falls this advantage more obviously, can be widely used in the steel such as non-hardened and tempered steel, high-strength thick H profile steel, tool steel, silicon steel, high-strength hot rolled ribbed steel bar and produce.
For a kind of ferro-silicon nitride alloy claded wire of the present invention, further describe as follows: 1), adopt the particle of the cheaper ferro-silicon nitride of price to be the main cored-wire made, N >=30% in ferro-silicon nitride, will exceed 8% than materials such as nitrogenize silicomanganese, chromium nitride, titanium nitride, aluminium nitride, the precipitation strength effect of nitrogen is more obvious.2) one or more iron alloys of V, Nb, Al, Ti of, adding in heart yearn, compare Al, Ti, Cr, Si, Mn element in nitrogenize silicomanganese, chromium nitride, titanium nitride, aluminium nitride, the probability reacted with oxygen in steel is more reduced under the cooperation of silicon base lanthanon powdered alloy, stability is better, nitrogen fixation effect and effect are more obvious, and N recovery rate is more than 40%.3), one or more iron alloy fixed nitrogen trace elements of V, Nb, Al, Ti in heart yearn, can use containing on V, Nb, Al, Ti trace nitrogen killer steel grade in production, also can such as: RHB400 etc. do not use containing on micro-nitrogen killer steel grade.Suitability is stronger, uses the steel grade produced wider.For current production rate maximum (accounting for reinforcing bar total amount more than 79%), covil construction purposes the most not V-alloyed steel RHB400, it is more obvious to fall this advantage, and ton steel can cost declining 5-60 unit.4), silicon base lanthanon powdered alloy is added in core powder, size composition accounts for 10-25% at≤0.5mm, 0.5-1mm accounts for 75-90%, silicon base lanthanon powdered alloy can be made to be uniformly filled in silicon nitride ferrovanadium particle, make coated cored-wire tightr, key can reach by silicon base lanthanon powdered alloy the effect that auxiliary fixed nitrogen alloying element iron alloy carries out fixed nitrogen, simultaneously, by the effect of rare earth alloy element, can effectively improve containing V micro-alloyed steel structure property and Grain refinement more obvious, V micro-alloyed steel grain size number can improve 1-2 grade, by improving and improve V micro-alloyed steel mechanical property, the effect realizing reducing V micro-alloyed steel alloy production cost is more obvious.5), add in molten steel with cored-wire form, can, by ferro-silicon nitride alloy claded wire feeding molten steel deep, adopt specific fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy to decrease scaling loss or oxidation loss.Avoid nitrogenous material in prior art to be easily oxidized by steel water oxygen, nitrogen fixation effect is poor, N recovery rate wild effect.
Embodiment 2
The making method of a kind of ferro-silicon nitride alloy claded wire of the present embodiment, its concrete step is:
Step one, ferro-silicon nitride alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation ferro-silicon nitride alloy, use vibratory screening apparatus that ferro-silicon nitride alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-3mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 5% of ferro-silicon nitride alloy total mass, the powder of particle diameter 0.5-1mm accounts for 90% of ferro-silicon nitride alloy total mass, the powder of particle diameter 1-3mm accounts for 5% of ferro-silicon nitride alloy total mass, ferro-silicon nitride alloy is obtained after batching mixing, for subsequent use.
Step 2, fixed nitrogen alloying element iron alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation in fixed nitrogen alloying element iron alloy, use vibratory screening apparatus that fixed nitrogen alloying element iron alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-2mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 10% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 0.5-1mm accounts for 80% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 1-2mm accounts for 10% of fixed nitrogen alloying element iron alloy total mass, fixed nitrogen alloying element iron alloy is obtained after batching mixing, for subsequent use.Fixed nitrogen alloying element iron alloy in the present embodiment adopts the mixing of ferrocolumbium and ferro-titanium, and the mass ratio of its mixing is 1:2.
Step 3, silicon base lanthanon powdered alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation silicon base lanthanon alloy, use vibratory screening apparatus that silicon base lanthanon alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 25% of silicon base lanthanon powdered alloy total mass, the powder of particle diameter 0.5-1mm accounts for 75% of silicon base lanthanon powdered alloy total mass, silicon base lanthanon powdered alloy is obtained after batching mixing, for subsequent use.
The preparation of step 4, core powder
Take step one to the ferro-silicon nitride alloy in step 3 70 parts, 4.9 parts, fixed nitrogen alloying element iron alloy, silicon base lanthanon powdered alloy 0.1 part by mass fraction, ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are mixed to get core powder.
The coated core powder of step 5, steel band
Employing thickness is that the core powder in step 4 is overmolding to the cored-wire that diameter is 9.5mm by the steel band of 0.34mm, obtains ferro-silicon nitride alloy claded wire.Obtained ferro-silicon nitride alloy claded wire requires its core powder rice weight >=200g/m, the meter Chong Liang >=390g/m of ferro-silicon nitride alloy claded wire, and specifically core powder rice weight is 200g/m in the present embodiment, and the meter Chong Liang of ferro-silicon nitride alloy claded wire is 390g/m.
When producing RHB400 steel, after converter tapping alloying, ferro-silicon nitride alloy claded wire prepared by the present embodiment is fed by feeding wire machine at ar blowing refining station, feed quantity presses the feeding of 3.4m/ ton steel, the nitrogen fixation effect of the present embodiment and effect be improved significantly, the recovery rate of nitrogen element in molten steel improves greatly.Other in the present embodiment illustrates with embodiment 1.
Embodiment 3
The making method of a kind of ferro-silicon nitride alloy claded wire of the present embodiment, its concrete step is:
Step one, ferro-silicon nitride alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation ferro-silicon nitride alloy, use vibratory screening apparatus that ferro-silicon nitride alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-3mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 10% of ferro-silicon nitride alloy total mass, the powder of particle diameter 0.5-1mm accounts for 80% of ferro-silicon nitride alloy total mass, the powder of particle diameter 1-3mm accounts for 10% of ferro-silicon nitride alloy total mass, ferro-silicon nitride alloy is obtained after batching mixing, for subsequent use.
Step 2, fixed nitrogen alloying element iron alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation in fixed nitrogen alloying element iron alloy, use vibratory screening apparatus that fixed nitrogen alloying element iron alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-2mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 5% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 0.5-1mm accounts for 90% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 1-2mm accounts for 5% of fixed nitrogen alloying element iron alloy total mass, fixed nitrogen alloying element iron alloy is obtained after batching mixing, for subsequent use.Fixed nitrogen alloying element iron alloy in the present embodiment adopts the mixing of ferro-vanadium, ferrocolumbium, ferroaluminium, and the mass ratio of its mixing is 1:2:1.
Step 3, silicon base lanthanon powdered alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation silicon base lanthanon alloy, use vibratory screening apparatus that silicon base lanthanon alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 10% of silicon base lanthanon powdered alloy total mass, the powder of particle diameter 0.5-1mm accounts for 90% of silicon base lanthanon powdered alloy total mass, silicon base lanthanon powdered alloy is obtained after batching mixing, for subsequent use.
The preparation of step 4, core powder
Take step one to the ferro-silicon nitride alloy in step 3 95 parts, 29.7 parts, fixed nitrogen alloying element iron alloy, silicon base lanthanon powdered alloy 0.3 part by mass fraction, ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are mixed to get core powder.
The coated core powder of step 5, steel band
Employing thickness is that the core powder in step 4 is overmolding to the cored-wire that diameter is 13mm by the steel band of 0.45mm, obtains ferro-silicon nitride alloy claded wire.Obtained ferro-silicon nitride alloy claded wire requires its core powder rice weight >=200g/m, the meter Chong Liang >=390g/m of ferro-silicon nitride alloy claded wire, and specifically core powder rice weight is 205g/m in the present embodiment, and the meter Chong Liang of ferro-silicon nitride alloy claded wire is 400g/m.
When producing RHB400E steel, after converter tapping alloying, ferro-silicon nitride alloy claded wire prepared by the present embodiment is fed by feeding wire machine at ar blowing refining station, feed quantity presses the feeding of 3.4m/ ton steel, the nitrogen fixation effect of the present embodiment and effect be improved significantly, the recovery rate of nitrogen element in molten steel improves greatly.Other in the present embodiment illustrates with embodiment 1.
Embodiment 4
The making method of a kind of ferro-silicon nitride alloy claded wire of the present embodiment, its concrete step is:
Step one, ferro-silicon nitride alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation ferro-silicon nitride alloy, use vibratory screening apparatus that ferro-silicon nitride alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-3mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 6% of ferro-silicon nitride alloy total mass, the powder of particle diameter 0.5-1mm accounts for 84% of ferro-silicon nitride alloy total mass, the powder of particle diameter 1-3mm accounts for 10% of ferro-silicon nitride alloy total mass, ferro-silicon nitride alloy is obtained after batching mixing, for subsequent use.
Step 2, fixed nitrogen alloying element iron alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation in fixed nitrogen alloying element iron alloy, use vibratory screening apparatus that fixed nitrogen alloying element iron alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-2mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 9% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 0.5-1mm accounts for 85% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 1-2mm accounts for 6% of fixed nitrogen alloying element iron alloy total mass, fixed nitrogen alloying element iron alloy is obtained after batching mixing, for subsequent use.Fixed nitrogen alloying element iron alloy in the present embodiment adopts the mixing of ferrocolumbium and ferro-titanium, and the mass ratio of its mixing is 1:2.
Step 3, silicon base lanthanon powdered alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation silicon base lanthanon alloy, use vibratory screening apparatus that silicon base lanthanon alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for 18% of silicon base lanthanon powdered alloy total mass, the powder of particle diameter 0.5-1mm accounts for 82% of silicon base lanthanon powdered alloy total mass, silicon base lanthanon powdered alloy is obtained after batching mixing, for subsequent use.
The preparation of step 4, core powder
Take step one to the ferro-silicon nitride alloy in step 3 87 parts, 12.6 parts, fixed nitrogen alloying element iron alloy, silicon base lanthanon powdered alloy 0.3 part by mass fraction, ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are mixed to get core powder.
The coated core powder of step 5, steel band
Employing thickness is that the core powder in step 4 is overmolding to the cored-wire that diameter is 12mm by the steel band of 0.40mm, obtains ferro-silicon nitride alloy claded wire.Obtained ferro-silicon nitride alloy claded wire requires its core powder rice weight >=200g/m, the meter Chong Liang >=390g/m of ferro-silicon nitride alloy claded wire, and specifically core powder rice weight is 215g/m in the present embodiment, and the meter Chong Liang of ferro-silicon nitride alloy claded wire is 395g/m.
When producing RHB500E steel, after converter tapping alloying, ferro-silicon nitride alloy claded wire prepared by the present embodiment is fed by feeding wire machine at LF refining furnace, feed quantity presses the feeding of 3.4m/ ton steel, the nitrogen fixation effect of the present embodiment and effect be improved significantly, the recovery rate of nitrogen element in molten steel improves greatly.Other in the present embodiment illustrates with embodiment 1.
Claims (7)
1. a ferro-silicon nitride alloy claded wire, it is characterized in that: this ferro-silicon nitride alloy claded wire is formed by the coated core powder of steel band, described core powder is made up of ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy, wherein: each components in mass portion of core powder is composed as follows: ferro-silicon nitride alloy 70-95 part, fixed nitrogen alloying element iron alloy 4.9-29.7 part, silicon base lanthanon powdered alloy 0.1-0.3 part, above-mentioned fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are used for nitrogen element to be fixed in molten steel.
2. a kind of ferro-silicon nitride alloy claded wire according to claim 1, is characterized in that: described fixed nitrogen alloying element iron alloy is one or more the mixing in ferro-vanadium, ferrocolumbium, ferroaluminium, ferro-titanium.
3. a kind of ferro-silicon nitride alloy claded wire according to claim 2, it is characterized in that: described ferro-silicon nitride alloy by particle diameter for≤0.5mm, 0.5-1mm, 1-3mm powder forms, wherein the powder of particle diameter≤0.5mm accounts for the 5-10% of ferro-silicon nitride alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 80-90% of ferro-silicon nitride alloy total mass, and the powder of particle diameter 1-3mm accounts for the 5-10% of ferro-silicon nitride alloy total mass.
4. a kind of ferro-silicon nitride alloy claded wire according to claim 2, it is characterized in that: described fixed nitrogen alloying element iron alloy by particle diameter for≤0.5mm, 0.5-1mm, 1-2mm powder forms, wherein the powder of particle diameter≤0.5mm accounts for the 5-10% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 80-90% of fixed nitrogen alloying element iron alloy total mass, and the powder of particle diameter 1-2mm accounts for the 5-10% of fixed nitrogen alloying element iron alloy total mass.
5. a kind of ferro-silicon nitride alloy claded wire according to claim 2, it is characterized in that: described silicon base lanthanon powdered alloy by particle diameter for≤0.5mm, 0.5-1mm powder forms, wherein the powder of particle diameter≤0.5mm accounts for the 10-25% of silicon base lanthanon powdered alloy total mass, and the powder of particle diameter 0.5-1mm accounts for the 75-90% of silicon base lanthanon powdered alloy total mass.
6. a making method for ferro-silicon nitride alloy claded wire, is characterized in that, the steps include:
Step one, ferro-silicon nitride alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation ferro-silicon nitride alloy, use vibratory screening apparatus that ferro-silicon nitride alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-3mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for the 5-10% of ferro-silicon nitride alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 80-90% of ferro-silicon nitride alloy total mass, the powder of particle diameter 1-3mm accounts for the 5-10% of ferro-silicon nitride alloy total mass, ferro-silicon nitride alloy is obtained after batching mixing, for subsequent use;
Step 2, fixed nitrogen alloying element iron alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation in fixed nitrogen alloying element iron alloy, use vibratory screening apparatus that fixed nitrogen alloying element iron alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm, 1-2mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for the 5-10% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 80-90% of fixed nitrogen alloying element iron alloy total mass, the powder of particle diameter 1-2mm accounts for the 5-10% of fixed nitrogen alloying element iron alloy total mass, fixed nitrogen alloying element iron alloy is obtained after batching mixing, for subsequent use;
Step 3, silicon base lanthanon powdered alloy are got the raw materials ready
Disintegrating apparatus is used to carry out fragmentation silicon base lanthanon alloy, use vibratory screening apparatus that silicon base lanthanon alloy good for fragmentation is sieved into≤0.5mm, 0.5-1mm powder after broken, prepare burden according to following weight percent again: the powder of particle diameter≤0.5mm accounts for the 10-25% of silicon base lanthanon powdered alloy total mass, the powder of particle diameter 0.5-1mm accounts for the 75-90% of silicon base lanthanon powdered alloy total mass, silicon base lanthanon powdered alloy is obtained after batching mixing, for subsequent use;
The preparation of step 4, core powder
Take step one to the ferro-silicon nitride alloy 70-95 part in step 3, fixed nitrogen alloying element iron alloy 4.9-29.7 part, silicon base lanthanon powdered alloy 0.1-0.3 part by mass fraction, ferro-silicon nitride alloy, fixed nitrogen alloying element iron alloy and silicon base lanthanon powdered alloy are mixed to get core powder;
The coated core powder of step 5, steel band
Employing thickness is that the core powder in step 4 is overmolding to the cored-wire that diameter is 9-13mm by the steel band of 0.34-0.45mm, obtains ferro-silicon nitride alloy claded wire.
7. the making method of a kind of ferro-silicon nitride alloy claded wire according to claim 6, is characterized in that: the fixed nitrogen alloying element iron alloy in step 2 is one or more the mixing in ferro-vanadium, ferrocolumbium, ferroaluminium, ferro-titanium.
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Denomination of invention: A Nitrided Silicon Iron Alloy Core Wire and Its Manufacturing Method Effective date of registration: 20230425 Granted publication date: 20180403 Pledgee: Agricultural Bank of China Limited Ma'anshan Huashan District Branch Pledgor: MAANSHAN XINGDA METALLURGICAL NEW MATERIAL Co.,Ltd. Registration number: Y2023980039131 |