CN112080609A - Composite nitrogen core-spun yarn for steelmaking and preparation and use methods thereof - Google Patents

Composite nitrogen core-spun yarn for steelmaking and preparation and use methods thereof Download PDF

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CN112080609A
CN112080609A CN202011052685.6A CN202011052685A CN112080609A CN 112080609 A CN112080609 A CN 112080609A CN 202011052685 A CN202011052685 A CN 202011052685A CN 112080609 A CN112080609 A CN 112080609A
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nitrogen
alloy
bin
iron sheet
percentage
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CN112080609B (en
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马玉婷
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Zhongye Liaoning New Materials Technology Research Co ltd
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Shenyang Steel Zhongbao Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C22/00—Alloys based on manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The invention relates to a composite nitrogen core-spun yarn for steelmaking and a preparation and use method thereof, wherein the composite nitrogen core-spun yarn for steelmaking comprises an alloy bin, a blind plate, a gas bin and an iron sheet shell, wherein the outermost layer is the iron sheet shell, the alloy bin and the gas bin are arranged in the iron sheet shell at intervals along the length direction, the alloy bin and the gas bin are separated by the blind plate, the circumference of the blind plate is connected with the inner wall of the iron sheet shell, and the alloy bin, the blind plate and the gas bin are wrapped and sealed by the iron sheet shell at the outermost layer along the circumferential direction; the raw materials of the inner core are randomly distributed in an alloy bin sealed by the iron sheet shell and the blind plate, and nitrogen is filled in the gas bin. The composite nitrogen cored wire provided by the invention can increase nitrogen in steel, can obviously improve the uniform distribution state of micro-alloying elements in a molten steel pool, improves the utilization rate of the alloying elements, reduces the consumption of the alloying elements and the steelmaking cost on the premise of ensuring the good performance of the steel, and is beneficial to energy conservation and emission reduction.

Description

Composite nitrogen core-spun yarn for steelmaking and preparation and use methods thereof
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a composite nitrogen cored wire for steelmaking and a preparation method and a use method thereof.
Background
The microalloying of vanadium and nitrogen is the main method for producing low-alloy high-strength steel, the addition of nitrogen element in the vanadium-containing steel can form vanadium carbide or nitride in the steel, and the yield strength of the steel can be greatly improved through the dual functions of precipitation, strengthening and grain refinement, and the steel has good plasticity, toughness and weldability. However, because the price of V alloying is high and the market fluctuation is large, the controllability of the production cost of steel mills is poor, so many steel mills are actively developing low-cost microalloying methods under the condition of ensuring good performance of steel. Chinese patent (publication No. CN1818086A, published: 2006, 08/16) discloses a cored wire made of vanadium-nitrogen alloy powder, which can improve the recovery rate of vanadium-nitrogen alloy, but the cored wire of the patent only contains vanadium-nitrogen alloy and a small amount of niobium-titanium alloy, and does not add nitrogen-rich alloy, so when the cored wire provided by the patent is used for microalloying molten steel, if the nitrogen content in the steel is increased, the vanadium content must be increased at the same time, the V/N ratio in the steel cannot be adjusted to the optimal ratio, and the utilization rate of vanadium is still low. Chinese patent (publication No. CN1405351A, published: 03/26/2003) discloses a method for microalloying vanadium and nitrogen by adding blocky nitrogen-rich alloy and vanadium-containing alloy respectively, aiming at increasing the nitrogen content and reducing the V/N ratio by the nitrogen-rich alloy. The nitrogen-rich alloy disclosed in the patent has low density, even lower than that of slag, and can float on steel slag after being added into molten steel, so that part of the alloy is burnt, and the recovery rate of the alloy is low and unstable. Therefore, a steel-making product with good smelting effect and low cost is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a composite nitrogen cored wire for steelmaking and a preparation method and a use method thereof.
A composite nitrogen cored wire for steelmaking comprises an alloy bin, a blind plate, a gas bin and an iron sheet shell, wherein the iron sheet shell is arranged on the outermost layer; the raw materials of the inner core are randomly distributed in an alloy bin sealed by the iron sheet shell and the blind plate, and nitrogen is filled in the gas bin.
The alloy bin is internally provided with a material blocking boss, one end of the material blocking boss is connected to the inner wall of the iron sheet shell, and the material blocking boss is in one of a circular truncated cone, a trapezoidal table, a frustum or a cube and used for preventing the inner core raw material from slipping.
The inner core in the alloy bin comprises the following raw material components in percentage by weight: 3-30% of nitrogen capsule, 50-90% of nitriding alloy, 1-15% of nitrogen fixing agent, 5-10% of cosolvent and 0-10% of slow release agent.
The nitrogen capsule comprises a rubber shell and nitrogen, and the nitrogen is sealed inside the rubber shell.
The nitrided alloy comprises, by weight, 10-30% of an aluminum-silicon-manganese alloy, 5-15% of an iron-silicon-aluminum alloy, 5-15% of medium-carbon ferromanganese, 50-80% of ferrosilicon nitride, 5-15% of a silico-calcium alloy, 0-20% of an aluminum-manganese alloy, 0-6% of zirconium silicate, 0-6% of a titanium-zirconium-molybdenum alloy and 0-4% of rare earth;
the aluminum-silicon-manganese alloy comprises the following elements in percentage by weight: 55-75% of Si, 10-25% of Al, 15-25% of Mn and the balance of Fe and inevitable other impurity elements;
the iron-silicon-aluminum alloy comprises the following elements in percentage by weight: 25-40% of Si, 15-25% of Al, and the balance of Fe and inevitable other impurity elements;
the medium carbon ferromanganese comprises the following elements in percentage by weight: the Mn content is 75-82%, the C content is less than or equal to 2%, and the balance is a small amount of Si and inevitable other impurity elements;
the ferrosilicon nitride comprises the following elements in percentage by weight: 27-30% of N, 45-50% of Si, and the balance of Fe and other inevitable impurity elements;
the silicon-calcium alloy comprises the following elements in percentage by weight: the content of Ca is more than or equal to 28 percent, the content of Si is 55 to 65 percent, and the balance is inevitable other impurity elements;
the aluminum-manganese alloy comprises the following elements in percentage by weight: 85-95% of Al, 1-5% of manganese and the balance of small amount of Mg, C and inevitable other impurity elements;
the zirconium silicate comprises the following elements in percentage by weight: ZrO (ZrO)2The content is 67 percent; SiO 22The content is 33%;
the titanium-zirconium-molybdenum alloy comprises the following elements in percentage by weight: 85-95% of Mo, 1-5% of Ti, 1-3% of Zr and the balance of small amount of inevitable other impurity elements.
The nitrogen fixing agent comprises 100-500 mesh powder prepared by crushing and screening any one of zeolite, magnesium powder, medical stone, bentonite and sepiolite.
The cosolvent comprises any one of cryolite and NaCl.
The slow release agent comprises any one of iron powder and ferrosilicon powder mixture.
The preparation method of the composite nitrogen cored wire for steelmaking comprises the following steps:
the method comprises the following steps: preparation of Nitrogen capsules
Heating the rubber tube with the closed bottom end in a cylindrical cavity die with a U-shaped inner cavity to soften the rubber tube, then filling nitrogen into the rubber tube from an opening at the top end of the rubber tube, flattening and sealing the opening of the rubber tube according to a length L, and cutting the opening to prepare a nitrogen capsule, wherein L is less than or equal to D/3, and D is the diameter of the core-spun yarn;
step two: preparation of core Material
Weighing inner core raw materials
Weighing inner core raw materials of a nitrogen capsule, a nitralloy, a nitrogen fixing agent, a cosolvent and a slow release agent according to the weight percentage;
② mechanical mixing
Putting the weighed nitrogen capsules, the nitrided alloy, the nitrogen fixing agent, the cosolvent and the sustained-release agent into a stirrer, and stirring and mixing uniformly;
step three: arranging a blind plate and preparing a gas cabin
Rolling up the two wide edges of the tiled iron sheet shell under the nitrogen atmosphere to enable the two sides of the tiled iron sheet shell to upwarp, and then welding the blind plate on the inner side of the iron sheet shell in a manner that the blind plate is perpendicular to the length direction of the iron sheet shell, so that a nitrogen gas bin for sealing the ambient nitrogen is formed, the nitrogen gas bins are sealed in a manner that the nitrogen gas bins are separated one by one, and a vacant bin is arranged between every two nitrogen gas bins and is used as an alloy bin for simultaneously filling the alloy inner core;
step four: is provided with a material blocking boss
Welding the prepared material blocking bosses on the inner wall of the iron sheet shell at the position of the alloy bin at intervals A, wherein A is less than D/5, and D is the diameter of the cored wire; the number of the material blocking bosses in each alloy bin is more than or equal to three;
step five: preparing core-spun yarn
And (3) uniformly arranging the inner core material uniformly stirred in the step (II) in an alloy bin consisting of the two blind plates and the iron sheet shell through a blanking opening distributor of a core-spun yarn unit by using the iron sheet shell provided with the blind plates, and then coating the core-spun yarn by using the core-spun yarn unit to form the composite nitrogen core-spun yarn for steelmaking.
The use method of the composite nitrogen cored wire for steelmaking comprises the following steps:
the method comprises the following steps: slag breaking
The slag covering the surface of the ladle and positioned around the wire feeding position is broken, so that the cored wire can stably penetrate through the slag and enter molten steel in the wire feeding process;
step two: wire feeding device
Feeding the composite nitrogen cored wire into molten steel at a certain speed by using a cored wire machine to enable the composite nitrogen cored wire to reach the depth of below 1.5m of the surface of a molten steel pool;
step three: dispersion of inner core raw material
The nitrogen in the nitrogen capsule in the gas bin and the alloy bin entering the molten pool expands after being heated, the nitrogen in the gas bin breaks the bin and the nitrogen in the nitrogen capsule breaks the pill to be discharged, a driving force is generated, the alloy bin is pushed to a position far away from the wire feeding position by the gas bin, and the inner core raw material in the alloy bin is pushed to the periphery by the nitrogen capsule, so that the distribution range of the inner core raw material in the molten pool is expanded;
step four: the core raw materials react in molten steel
The nitrogen in the broken gas bin and the nitrogen capsule and the inner core raw material of the core-spun yarn pushed to all positions of the molten pool react with the molten steel, so that nitrogen increase and component microalloying of the molten steel are realized.
The invention has the beneficial effects that: the composite nitrogen cored wire provided by the invention can increase nitrogen in steel, can obviously improve the uniform distribution state of micro-alloying elements in a molten steel pool, improves the utilization rate of the alloying elements, reduces the consumption of the alloying elements and the steelmaking cost on the premise of ensuring the good performance of the steel, and is beneficial to energy conservation and emission reduction.
Drawings
FIG. 1 is a schematic view of a composite nitrogen cored wire for steelmaking according to an embodiment;
FIG. 2 is a schematic view of the position of the material blocking boss inside the cored wire;
FIG. 3 is a schematic diagram of a nitrogen capsule in a composite nitrogen cored wire for steelmaking according to an embodiment;
wherein,
the device comprises an alloy bin 1, a blind plate 2, a gas bin 3, a nitrogen capsule 4, a rubber shell 41, nitrogen 42, a nitralloy 5, an iron sheet shell 6, a nitrogen fixing agent 7, a cosolvent 8, a slow-release agent 9 and a material blocking boss 10.
Detailed Description
For better understanding of the present invention, the technical solutions and effects of the present invention will be described in detail by the following embodiments with reference to the accompanying drawings.
Example 1
As shown in fig. 1, a composite nitrogen cored wire for steelmaking comprises an alloy bin 1, a blind plate 2, a gas bin 3 and an iron sheet shell 6, wherein the iron sheet shell 6 is arranged on the outermost layer, the alloy bin 1 and the gas bin 3 are arranged in the iron sheet shell 6 at intervals along the length direction, the alloy bin 1 and the gas bin 3 are separated by the blind plate 2, the circumference of the blind plate 2 is connected with the inner wall of the iron sheet shell 6, and the alloy bin 1, the blind plate 2 and the gas bin 3 are wrapped and sealed by the iron sheet shell 6 on the outermost layer along the circumferential direction; the inner core raw materials are randomly distributed in an alloy bin 1 which is formed by sealing an iron sheet shell 6 and a blind plate 2, and nitrogen is filled in a gas bin 3.
As shown in fig. 2, a material blocking boss 10 is arranged in the alloy bin 1, one end of the material blocking boss 10 is connected to the inner wall of the iron sheet shell 6, and the material blocking boss 10 is in one of a circular truncated cone, a trapezoidal truncated cone, a frustum or a cube and is used for preventing the inner core raw material from slipping.
In this embodiment, the inner core in the alloy bin 1 comprises the following raw material components in percentage by weight: 3 percent of nitrogen capsule 4, 90 percent of nitralloy 5, 2 percent of nitrogen fixing agent 7, 5 percent of cosolvent 8 and 0 percent of sustained-release agent 9.
As shown in fig. 3, the nitrogen gas capsule 4 includes a rubber case 41 and nitrogen gas 42, and the nitrogen gas 42 is sealed inside the rubber case 41.
The nitriding alloy 5 comprises, by weight, 10% of an aluminum-silicon-manganese alloy, 5% of an iron-silicon-aluminum alloy, 5% of medium-carbon ferromanganese, 75% of silicon-iron nitride, 5% of a silicon-calcium alloy, 0% of an aluminum-manganese alloy, 0% of zirconium silicate, 0% of a titanium-zirconium-molybdenum alloy and 0% of rare earth.
The aluminum-silicon-manganese alloy comprises the following elements in percentage by weight: the alloy comprises 60% of Si, 10% of Al, 25% of Mn and the balance of Fe and inevitable other impurity elements;
the iron-silicon-aluminum alloy comprises the following elements in percentage by weight: the content of Si is 40%, the content of Al is 15%, and the balance is Fe and other inevitable impurity elements;
the medium carbon ferromanganese comprises the following elements in percentage by weight: the content of Mn is 75 percent, the content of C is 2 percent, and the balance is a small amount of Si and inevitable other impurity elements;
the ferrosilicon nitride comprises the following elements in percentage by weight: 30% of N, 45% of Si and the balance of Fe and other inevitable impurity elements;
the silicon-calcium alloy comprises the following elements in percentage by weight: the content of Ca is 28 percent, the content of Si is 65 percent, and the balance is inevitable other impurity elements;
the aluminum-manganese alloy comprises the following elements in percentage by weight: 95% of Al, 1% of manganese and the balance of small amount of Mg, C and inevitable other impurity elements;
the zirconium silicate comprises the following elements in percentage by weight: ZrO (ZrO)2The content is 67 percent; SiO 22The content is 33%;
the titanium-zirconium-molybdenum alloy comprises the following elements in percentage by weight: the content of Mo is 95%, the content of Ti is 1%, the content of Zr is 1%, and the balance is small amount of inevitable other impurity elements.
The nitrogen fixing agent 7 is 100-500 mesh powder prepared by crushing and screening any one of zeolite, magnesium powder, medical stone, bentonite and sepiolite. Zeolites were used in this example.
The cosolvent 8 comprises any one of cryolite and NaCl. Cryolite is used in this example.
The slow release agent 9 comprises any one of iron powder and ferrosilicon powder mixture. In this example, iron powder is used.
The preparation method of the composite nitrogen cored wire for steelmaking comprises the following steps:
the method comprises the following steps: preparation of Nitrogen capsules 4
Heating the rubber tube with the closed bottom end in a cylindrical cavity die with a U-shaped inner cavity to soften the rubber tube, then filling nitrogen into the rubber tube from an opening at the top end of the rubber tube, flattening and sealing the opening of the rubber tube according to a length L, and cutting the opening to prepare a nitrogen capsule 4, wherein L is less than or equal to D/3, and D is the diameter of the core-spun yarn;
step two: preparation of core Material
Weighing inner core raw materials
Weighing inner core raw materials of a nitrogen capsule 4, a nitralloy 5, a nitrogen fixing agent 7, a cosolvent 8 and a sustained release agent 9 according to the weight percentage;
② mechanical mixing
Putting the weighed nitrogen capsule 4, the nitrided alloy 5, the nitrogen fixing agent 7, the cosolvent 8 and the sustained-release agent 9 into a stirrer, and stirring and mixing uniformly;
step three: a blind plate 2 is arranged, and a gas cabin 3 is prepared
Rolling up the wide edges on two sides of a tiled iron sheet shell 6 in a nitrogen atmosphere to enable the two sides of the tiled iron sheet shell to upwarp, welding a blind plate 2 perpendicular to the length direction of the iron sheet shell 6 on the inner side of the iron sheet shell 6, so as to form a nitrogen gas bin 3 for sealing the nitrogen gas in the environment, wherein the nitrogen gas bin 3 is sealed in a manner of being empty and spaced one by one, and an empty bin is arranged between every two nitrogen gas bins 3 and is used as an alloy bin 1 for simultaneously loading alloy inner cores;
step four: a material blocking boss 10 is arranged
Welding prepared material blocking bosses 10 on the inner wall of an iron sheet shell 6 at the position of an alloy bin 1 at intervals A, wherein A is less than D/5, and D is the diameter of a cored wire; in the embodiment, the number of the material blocking bosses 10 in each alloy bin 1 is seven;
step five: preparing core-spun yarn
And (3) uniformly arranging the inner core material uniformly stirred in the step (II) in an alloy bin 1 consisting of the two blind plates 2 and the iron sheet shell 6 through a feed opening distributor of a core-spun yarn unit by using the iron sheet shell 6 with the mounted blind plates 2, and then coating the core-spun yarn by using a core-spun yarn unit to form the composite nitrogen core-spun yarn for steelmaking.
The use method of the composite nitrogen cored wire for steelmaking comprises the following steps:
the method comprises the following steps: slag breaking
The slag covering the surface of the ladle and positioned around the wire feeding position is broken, so that the cored wire can stably penetrate through the slag and enter molten steel in the wire feeding process;
step two: wire feeding device
Feeding the composite nitrogen cored wire into molten steel at a certain speed by using a cored wire machine to enable the composite nitrogen cored wire to reach the depth of below 1.5m of the surface of a molten steel pool;
step three: dispersion of inner core raw material
The nitrogen 42 in the nitrogen capsule 4 in the gas bin 3 and the alloy bin 1 entering the molten pool expands after being heated, the nitrogen in the gas bin 3 breaks the bin and the nitrogen 42 in the nitrogen capsule 4 breaks the pill to be discharged, a driving force is generated, the alloy bin 1 is pushed to a position far away from a wire feeding position by the gas bin 3, the inner core raw material in the alloy bin 1 is pushed to the periphery of the inner core raw material by the nitrogen capsule 4, and the distribution range of the inner core raw material in the molten pool is expanded;
step four: the core raw materials react in molten steel
The nitrogen 42 in the broken gas bin 3 and the nitrogen capsule 4 and the inner core raw material of the core-spun yarn pushed to all positions of the molten pool react with the molten steel, so that nitrogen increase and component microalloying of the molten steel are realized.
Example 2
As shown in fig. 1, a composite nitrogen cored wire for steelmaking comprises an alloy bin 1, a blind plate 2, a gas bin 3 and an iron sheet shell 6, wherein the iron sheet shell 6 is arranged on the outermost layer, the alloy bin 1 and the gas bin 3 are arranged in the iron sheet shell 6 at intervals along the length direction, the alloy bin 1 and the gas bin 3 are separated by the blind plate 2, the circumference of the blind plate 2 is connected with the inner wall of the iron sheet shell 6, and the alloy bin 1, the blind plate 2 and the gas bin 3 are wrapped and sealed by the iron sheet shell 6 on the outermost layer along the circumferential direction; the inner core raw materials are randomly distributed in an alloy bin 1 which is formed by sealing an iron sheet shell 6 and a blind plate 2, and nitrogen is filled in a gas bin 3.
As shown in fig. 2, a material blocking boss 10 is arranged in the alloy bin 1, one end of the material blocking boss 10 is connected to the inner wall of the iron sheet shell 6, and the material blocking boss 10 is in one of a circular truncated cone, a trapezoidal truncated cone, a frustum or a cube and is used for preventing the inner core raw material from slipping.
In this embodiment, the inner core in the alloy bin 1 comprises the following raw material components in percentage by weight: 29% of nitrogen capsule 4, 50% of nitriding alloy 5, 1% of nitrogen fixing agent 7, 10% of cosolvent 8 and 10% of sustained-release agent 9.
As shown in fig. 3, the nitrogen gas capsule 4 includes a rubber case 41 and nitrogen gas 42, and the nitrogen gas 42 is sealed inside the rubber case 41.
The nitriding alloy 5 comprises 15% of aluminum-silicon-manganese alloy, 8% of iron-silicon-aluminum alloy, 8% of medium carbon ferromanganese, 50% of silicon nitride iron, 8% of silicon-calcium alloy, 5% of aluminum-manganese alloy, 2% of zirconium silicate, 2% of titanium-zirconium-molybdenum alloy and 2% of rare earth according to weight percentage.
The aluminum-silicon-manganese alloy comprises the following elements in percentage by weight: 55% of Si, 25% of Al, 15% of Mn and the balance of Fe and inevitable other impurity elements;
the iron-silicon-aluminum alloy comprises the following elements in percentage by weight: the content of Si is 35 percent, the content of Al is 20 percent, and the balance is Fe and other inevitable impurity elements;
the medium carbon ferromanganese comprises the following elements in percentage by weight: 82% of Mn, 0.6% of C and the balance of a small amount of Si and inevitable other impurity elements;
the ferrosilicon nitride comprises the following elements in percentage by weight: 27% of N, 50% of Si and the balance of Fe and other inevitable impurity elements;
the silicon-calcium alloy comprises the following elements in percentage by weight: the content of Ca is 40 percent, the content of Si is 55 percent, and the balance is inevitable other impurity elements;
the aluminum-manganese alloy comprises the following elements in percentage by weight: 85% of Al, 5% of manganese and the balance of small amount of Mg, C and inevitable other impurity elements;
the zirconium silicate comprises the following elements in percentage by weight: ZrO (ZrO)2The content is 67 percent; SiO 22The content is 33%;
the titanium-zirconium-molybdenum alloy comprises the following elements in percentage by weight: 85% of Mo, 5% of Ti, 3% of Zr and the balance of small inevitable impurity elements.
The nitrogen fixing agent 7 is 100-500 mesh powder prepared by crushing and screening any one of zeolite, magnesium powder, medical stone, bentonite and sepiolite. In the embodiment, medical stone is adopted.
The cosolvent 8 comprises any one of cryolite and NaCl. NaCl was used in this example.
The slow release agent 9 comprises any one of iron powder and ferrosilicon powder mixture. In this example, a silicon-iron powder mixture was used.
The preparation method and the use method of the composite nitrogen cored wire for steelmaking provided by the embodiment are the same as those of the embodiment 1.
Example 3
As shown in fig. 1, a composite nitrogen cored wire for steelmaking comprises an alloy bin 1, a blind plate 2, a gas bin 3 and an iron sheet shell 6, wherein the iron sheet shell 6 is arranged on the outermost layer, the alloy bin 1 and the gas bin 3 are arranged in the iron sheet shell 6 at intervals along the length direction, the alloy bin 1 and the gas bin 3 are separated by the blind plate 2, the circumference of the blind plate 2 is connected with the inner wall of the iron sheet shell 6, and the alloy bin 1, the blind plate 2 and the gas bin 3 are wrapped and sealed by the iron sheet shell 6 on the outermost layer along the circumferential direction; the inner core raw materials are randomly distributed in an alloy bin 1 which is formed by sealing an iron sheet shell 6 and a blind plate 2, and nitrogen is filled in a gas bin 3.
As shown in fig. 2, a material blocking boss 10 is arranged in the alloy bin 1, one end of the material blocking boss 10 is connected to the inner wall of the iron sheet shell 6, and the material blocking boss 10 is in one of a circular truncated cone, a trapezoidal truncated cone, a frustum or a cube and is used for preventing the inner core raw material from slipping.
In this embodiment, the inner core in the alloy bin 1 comprises the following raw material components in percentage by weight: 30% of nitrogen capsule 4, 39% of nitriding alloy 5, 15% of nitrogen fixing agent 7, 8% of cosolvent 8 and 8% of sustained-release agent 9.
As shown in fig. 3, the nitrogen gas capsule 4 includes a rubber case 41 and nitrogen gas 42, and the nitrogen gas 42 is sealed inside the rubber case 41.
The nitriding alloy 5 comprises 10% of aluminum-silicon-manganese alloy, 15% of iron-silicon-aluminum alloy, 6% of medium carbon ferromanganese, 50% of silicon nitride iron, 15% of silicon-calcium alloy, 1% of aluminum-manganese alloy, 1% of zirconium silicate, 1% of titanium-zirconium-molybdenum alloy and 1% of rare earth according to weight percentage.
The aluminum-silicon-manganese alloy comprises the following elements in percentage by weight: the alloy comprises 70% of Si, 10% of Al, 15% of Mn and the balance of Fe and inevitable other impurity elements;
the iron-silicon-aluminum alloy comprises the following elements in percentage by weight: 25% of Si, 25% of Al and the balance of Fe and other inevitable impurity elements;
the medium carbon ferromanganese comprises the following elements in percentage by weight: 80% of Mn, 1.8% of C and the balance of a small amount of Si and inevitable other impurity elements;
the ferrosilicon nitride comprises the following elements in percentage by weight: 28% of N, 48% of Si and the balance of Fe and other inevitable impurity elements;
the silicon-calcium alloy comprises the following elements in percentage by weight: the Ca content is 35 percent, the Si content is 60 percent, and the balance is inevitable other impurity elements;
the aluminum-manganese alloy comprises the following elements in percentage by weight: 90% of Al, 4% of manganese and the balance of small amount of Mg, C and inevitable other impurity elements;
the zirconium silicate comprises the following elements in percentage by weight: ZrO (ZrO)2The content is 67 percent; SiO 22The content is 33%;
the titanium-zirconium-molybdenum alloy comprises the following elements in percentage by weight: 90% of Mo, 2% of Ti, 2% of Zr and the balance of small amount of inevitable other impurity elements.
The nitrogen fixing agent 7 is 100-500 mesh powder prepared by crushing and screening any one of zeolite, magnesium powder, medical stone, bentonite and sepiolite. Sepiolite was used in this example.
The cosolvent 8 comprises any one of cryolite and NaCl. NaCl was used in this example.
The slow release agent 9 comprises any one of iron powder and ferrosilicon powder mixture. In this example, a silicon-iron powder mixture was used.
The preparation method and the use method of the composite nitrogen cored wire for steelmaking provided by the embodiment are the same as those of the embodiment 1.
Example 4
As shown in fig. 1, a composite nitrogen cored wire for steelmaking comprises an alloy bin 1, a blind plate 2, a gas bin 3 and an iron sheet shell 6, wherein the iron sheet shell 6 is arranged on the outermost layer, the alloy bin 1 and the gas bin 3 are arranged in the iron sheet shell 6 at intervals along the length direction, the alloy bin 1 and the gas bin 3 are separated by the blind plate 2, the circumference of the blind plate 2 is connected with the inner wall of the iron sheet shell 6, and the alloy bin 1, the blind plate 2 and the gas bin 3 are wrapped and sealed by the iron sheet shell 6 on the outermost layer along the circumferential direction; the inner core raw materials are randomly distributed in an alloy bin 1 which is formed by sealing an iron sheet shell 6 and a blind plate 2, and nitrogen is filled in a gas bin 3.
As shown in fig. 2, a material blocking boss 10 is arranged in the alloy bin 1, one end of the material blocking boss 10 is connected to the inner wall of the iron sheet shell 6, and the material blocking boss 10 is in one of a circular truncated cone, a trapezoidal truncated cone, a frustum or a cube and is used for preventing the inner core raw material from slipping.
In this embodiment, the inner core in the alloy bin 1 comprises the following raw material components in percentage by weight: 30% of nitrogen capsule 4, 39% of nitriding alloy 5, 15% of nitrogen fixing agent 7, 8% of cosolvent 8 and 8% of sustained-release agent 9.
As shown in fig. 3, the nitrogen gas capsule 4 includes a rubber case 41 and nitrogen gas 42, and the nitrogen gas 42 is sealed inside the rubber case 41.
The nitriding alloy 5 comprises 11 percent of aluminum-silicon-manganese alloy, 6 percent of iron-silicon-aluminum alloy, 15 percent of medium-carbon ferromanganese, 50 percent of silicon-iron nitride, 6 percent of silicon-calcium alloy, 0 percent of aluminum-manganese alloy, 6 percent of zirconium silicate, 6 percent of titanium-zirconium-molybdenum alloy and 0 percent of rare earth according to weight percentage.
The aluminum-silicon-manganese alloy comprises the following elements in percentage by weight: the alloy comprises 70% of Si, 10% of Al, 15% of Mn and the balance of Fe and inevitable other impurity elements;
the iron-silicon-aluminum alloy comprises the following elements in percentage by weight: 25% of Si, 25% of Al and the balance of Fe and other inevitable impurity elements;
the medium carbon ferromanganese comprises the following elements in percentage by weight: 80% of Mn, 1.8% of C and the balance of a small amount of Si and inevitable other impurity elements;
the ferrosilicon nitride comprises the following elements in percentage by weight: 28% of N, 48% of Si and the balance of Fe and other inevitable impurity elements;
the silicon-calcium alloy comprises the following elements in percentage by weight: the Ca content is 35 percent, the Si content is 60 percent, and the balance is inevitable other impurity elements;
the aluminum-manganese alloy comprises the following elements in percentage by weight: 90% of Al, 4% of manganese and the balance of small amount of Mg, C and inevitable other impurity elements;
the zirconium silicate comprises the following elements in percentage by weight: ZrO (ZrO)2The content is 67 percent; SiO 22The content is 33%;
the titanium-zirconium-molybdenum alloy comprises the following elements in percentage by weight: 90% of Mo, 2% of Ti, 2% of Zr and the balance of small amount of inevitable other impurity elements.
The nitrogen fixing agent 7 is 100-500 mesh powder prepared by crushing and screening any one of zeolite, magnesium powder, medical stone, bentonite and sepiolite. Sepiolite was used in this example.
The cosolvent 8 comprises any one of cryolite and NaCl. NaCl was used in this example.
The slow release agent 9 comprises any one of iron powder and ferrosilicon powder mixture. In this example, a silicon-iron powder mixture was used.
The preparation method and the use method of the composite nitrogen cored wire for steelmaking provided by the embodiment are the same as those of the embodiment 1.
Example 5
As shown in fig. 1, a composite nitrogen cored wire for steelmaking comprises an alloy bin 1, a blind plate 2, a gas bin 3 and an iron sheet shell 6, wherein the iron sheet shell 6 is arranged on the outermost layer, the alloy bin 1 and the gas bin 3 are arranged in the iron sheet shell 6 at intervals along the length direction, the alloy bin 1 and the gas bin 3 are separated by the blind plate 2, the circumference of the blind plate 2 is connected with the inner wall of the iron sheet shell 6, and the alloy bin 1, the blind plate 2 and the gas bin 3 are wrapped and sealed by the iron sheet shell 6 on the outermost layer along the circumferential direction; the inner core raw materials are randomly distributed in an alloy bin 1 which is formed by sealing an iron sheet shell 6 and a blind plate 2, and nitrogen is filled in a gas bin 3.
As shown in fig. 2, a material blocking boss 10 is arranged in the alloy bin 1, one end of the material blocking boss 10 is connected to the inner wall of the iron sheet shell 6, and the material blocking boss 10 is in one of a circular truncated cone, a trapezoidal truncated cone, a frustum or a cube and is used for preventing the inner core raw material from slipping.
In this embodiment, the inner core in the alloy bin 1 comprises the following raw material components in percentage by weight: 30% of nitrogen capsule 4, 39% of nitriding alloy 5, 15% of nitrogen fixing agent 7, 8% of cosolvent 8 and 8% of sustained-release agent 9.
As shown in fig. 3, the nitrogen gas capsule 4 includes a rubber case 41 and nitrogen gas 42, and the nitrogen gas 42 is sealed inside the rubber case 41.
The nitriding alloy 5 comprises 30% of aluminum-silicon-manganese alloy, 5% of iron-silicon-aluminum alloy, 5% of medium carbon ferromanganese, 50% of silicon nitride iron, 5% of silicon-calcium alloy, 1% of aluminum-manganese alloy, 0% of zirconium silicate, 0% of titanium-zirconium-molybdenum alloy and 4% of rare earth according to weight percentage.
The aluminum-silicon-manganese alloy comprises the following elements in percentage by weight: the alloy comprises 70% of Si, 10% of Al, 15% of Mn and the balance of Fe and inevitable other impurity elements;
the iron-silicon-aluminum alloy comprises the following elements in percentage by weight: 25% of Si, 25% of Al and the balance of Fe and other inevitable impurity elements;
the medium carbon ferromanganese comprises the following elements in percentage by weight: 80% of Mn, 1.8% of C and the balance of a small amount of Si and inevitable other impurity elements;
the ferrosilicon nitride comprises the following elements in percentage by weight: 28% of N, 48% of Si and the balance of Fe and other inevitable impurity elements;
the silicon-calcium alloy comprises the following elements in percentage by weight: the Ca content is 35 percent, the Si content is 60 percent, and the balance is inevitable other impurity elements;
the aluminum-manganese alloy comprises the following elements in percentage by weight: 90% of Al, 4% of manganese and the balance of small amount of Mg, C and inevitable other impurity elements;
the zirconium silicate comprises the following elements in percentage by weight: ZrO (ZrO)2The content is 67 percent; SiO 22The content is 33%;
the titanium-zirconium-molybdenum alloy comprises the following elements in percentage by weight: 90% of Mo, 2% of Ti, 2% of Zr and the balance of small amount of inevitable other impurity elements.
The nitrogen fixing agent 7 is 100-500 mesh powder prepared by crushing and screening any one of zeolite, magnesium powder, medical stone, bentonite and sepiolite. Sepiolite was used in this example.
The cosolvent 8 comprises any one of cryolite and NaCl. NaCl was used in this example.
The slow release agent 9 comprises any one of iron powder and ferrosilicon powder mixture. In this example, a silicon-iron powder mixture was used.
The preparation method and the use method of the composite nitrogen cored wire for steelmaking provided by the embodiment are the same as those of the embodiment 1.
Example 6
As shown in fig. 1, a composite nitrogen cored wire for steelmaking comprises an alloy bin 1, a blind plate 2, a gas bin 3 and an iron sheet shell 6, wherein the iron sheet shell 6 is arranged on the outermost layer, the alloy bin 1 and the gas bin 3 are arranged in the iron sheet shell 6 at intervals along the length direction, the alloy bin 1 and the gas bin 3 are separated by the blind plate 2, the circumference of the blind plate 2 is connected with the inner wall of the iron sheet shell 6, and the alloy bin 1, the blind plate 2 and the gas bin 3 are wrapped and sealed by the iron sheet shell 6 on the outermost layer along the circumferential direction; the inner core raw materials are randomly distributed in an alloy bin 1 which is formed by sealing an iron sheet shell 6 and a blind plate 2, and nitrogen is filled in a gas bin 3.
As shown in fig. 2, a material blocking boss 10 is arranged in the alloy bin 1, one end of the material blocking boss 10 is connected to the inner wall of the iron sheet shell 6, and the material blocking boss 10 is in one of a circular truncated cone, a trapezoidal truncated cone, a frustum or a cube and is used for preventing the inner core raw material from slipping.
In this embodiment, the inner core in the alloy bin 1 comprises the following raw material components in percentage by weight: 30% of nitrogen capsule 4, 39% of nitriding alloy 5, 15% of nitrogen fixing agent 7, 8% of cosolvent 8 and 8% of sustained-release agent 9.
As shown in fig. 3, the nitrogen gas capsule 4 includes a rubber case 41 and nitrogen gas 42, and the nitrogen gas 42 is sealed inside the rubber case 41.
The nitriding alloy 5 comprises, by weight, 10% of an aluminum-silicon-manganese alloy, 5% of an iron-silicon-aluminum alloy, 5% of medium-carbon ferromanganese, 53.5% of silicon-iron nitride, 5% of a silicon-calcium alloy, 20% of an aluminum-manganese alloy, 0.5% of zirconium silicate, 0.5% of a titanium-zirconium-molybdenum alloy and 0.5% of rare earth.
The aluminum-silicon-manganese alloy comprises the following elements in percentage by weight: the alloy comprises 70% of Si, 10% of Al, 15% of Mn and the balance of Fe and inevitable other impurity elements;
the iron-silicon-aluminum alloy comprises the following elements in percentage by weight: 25% of Si, 25% of Al and the balance of Fe and other inevitable impurity elements;
the medium carbon ferromanganese comprises the following elements in percentage by weight: 80% of Mn, 1.8% of C and the balance of a small amount of Si and inevitable other impurity elements;
the ferrosilicon nitride comprises the following elements in percentage by weight: 28% of N, 48% of Si and the balance of Fe and other inevitable impurity elements;
the silicon-calcium alloy comprises the following elements in percentage by weight: the Ca content is 35 percent, the Si content is 60 percent, and the balance is inevitable other impurity elements;
the aluminum-manganese alloy comprises the following elements in percentage by weight: 90% of Al, 4% of manganese and the balance of small amount of Mg, C and inevitable other impurity elements;
the zirconium silicate comprises the following elements in percentage by weight: ZrO (ZrO)2The content is 67 percent; SiO 22The content is 33%;
the titanium-zirconium-molybdenum alloy comprises the following elements in percentage by weight: 90% of Mo, 2% of Ti, 2% of Zr and the balance of small amount of inevitable other impurity elements.
The nitrogen fixing agent 7 is 100-500 mesh powder prepared by crushing and screening any one of zeolite, magnesium powder, medical stone, bentonite and sepiolite. Sepiolite was used in this example.
The cosolvent 8 comprises any one of cryolite and NaCl. NaCl was used in this example.
The slow release agent 9 comprises any one of iron powder and ferrosilicon powder mixture. In this example, a silicon-iron powder mixture was used.
The preparation method and the use method of the composite nitrogen cored wire for steelmaking provided by the embodiment are the same as those of the embodiment 1.

Claims (10)

1. The utility model provides a compound nitrogen cored wire for steelmaking which characterized in that: the alloy bin, the blind plate and the gas bin are wrapped and sealed by the iron sheet shell at the outermost layer along the circumferential direction; the raw materials of the inner core are randomly distributed in an alloy bin sealed by the iron sheet shell and the blind plate, and nitrogen is filled in the gas bin.
2. The composite nitrogen cored wire for steelmaking as claimed in claim 1, wherein: the alloy bin is internally provided with a material blocking boss, one end of the material blocking boss is connected to the inner wall of the iron sheet shell, and the material blocking boss is in one of a circular truncated cone, a trapezoidal table, a frustum or a cube and used for preventing the inner core raw material from slipping.
3. The composite nitrogen cored wire for steelmaking as claimed in claim 1, wherein: the inner core in the alloy bin comprises the following raw material components in percentage by weight: 3-30% of nitrogen capsule, 50-90% of nitriding alloy, 1-15% of nitrogen fixing agent, 5-10% of cosolvent and 0-10% of slow release agent.
4. The composite nitrogen cored wire for steelmaking as claimed in claim 3, wherein: the nitrogen capsule comprises a rubber shell and nitrogen, and the nitrogen is sealed inside the rubber shell.
5. The composite nitrogen cored wire for steelmaking as claimed in claim 3, wherein: the nitrided alloy comprises, by weight, 10-30% of an aluminum-silicon-manganese alloy, 5-15% of an iron-silicon-aluminum alloy, 5-15% of medium-carbon ferromanganese, 50-80% of ferrosilicon nitride, 5-15% of a silico-calcium alloy, 0-20% of an aluminum-manganese alloy, 0-6% of zirconium silicate, 0-6% of a titanium-zirconium-molybdenum alloy and 0-4% of rare earth;
the aluminum-silicon-manganese alloy comprises the following elements in percentage by weight: 55-75% of Si, 10-25% of Al, 15-25% of Mn and the balance of Fe and inevitable other impurity elements;
the iron-silicon-aluminum alloy comprises the following elements in percentage by weight: 25-40% of Si, 15-25% of Al, and the balance of Fe and inevitable other impurity elements;
the medium carbon ferromanganese comprises the following elements in percentage by weight: the Mn content is 75-82%, the C content is less than or equal to 2%, and the balance is a small amount of Si and inevitable other impurity elements;
the ferrosilicon nitride comprises the following elements in percentage by weight: 27-30% of N, 45-50% of Si, and the balance of Fe and other inevitable impurity elements;
the silicon-calcium alloy comprises the following elements in percentage by weight: the content of Ca is more than or equal to 28 percent, the content of Si is 55 to 65 percent, and the balance is inevitable other impurity elements;
the aluminum-manganese alloy comprises the following elements in percentage by weight: 85-95% of Al, 1-5% of manganese and the balance of small amount of Mg, C and inevitable other impurity elements;
the zirconium silicate comprises the following elements in percentage by weight: ZrO (ZrO)2The content is 67 percent; SiO 22The content is 33%;
the titanium-zirconium-molybdenum alloy comprises the following elements in percentage by weight: 85-95% of Mo, 1-5% of Ti, 1-3% of Zr and the balance of small amount of inevitable other impurity elements.
6. The composite nitrogen cored wire for steelmaking as claimed in claim 3, wherein: the nitrogen fixing agent comprises 100-500 mesh powder prepared by crushing and screening any one of zeolite, magnesium powder, medical stone, bentonite and sepiolite.
7. The composite nitrogen cored wire for steelmaking as claimed in claim 3, wherein: the cosolvent comprises any one of cryolite and NaCl.
8. The composite nitrogen cored wire for steelmaking as claimed in claim 3, wherein: the slow release agent comprises any one of iron powder and ferrosilicon powder mixture.
9. The method for preparing the composite nitrogen cored wire for steelmaking as claimed in claim 1, characterized by comprising the steps of:
the method comprises the following steps: preparation of Nitrogen capsules
Heating the rubber tube with the closed bottom end in a cylindrical cavity die with a U-shaped inner cavity to soften the rubber tube, then filling nitrogen into the rubber tube from an opening at the top end of the rubber tube, flattening and sealing the opening of the rubber tube according to a length L, and cutting the opening to prepare a nitrogen capsule, wherein L is less than or equal to D/3, and D is the diameter of the core-spun yarn;
step two: preparation of core Material
Weighing inner core raw materials
Weighing inner core raw materials of a nitrogen capsule, a nitralloy, a nitrogen fixing agent, a cosolvent and a slow release agent according to the weight percentage;
② mechanical mixing
Putting the weighed nitrogen capsules, the nitrided alloy, the nitrogen fixing agent, the cosolvent and the sustained-release agent into a stirrer, and stirring and mixing uniformly;
step three: arranging a blind plate and preparing a gas cabin
Rolling up the two wide edges of the tiled iron sheet shell under the nitrogen atmosphere to enable the two sides of the tiled iron sheet shell to upwarp, and then welding the blind plate on the inner side of the iron sheet shell in a manner that the blind plate is perpendicular to the length direction of the iron sheet shell, so that a nitrogen gas bin for sealing the ambient nitrogen is formed, the nitrogen gas bins are sealed in a manner that the nitrogen gas bins are separated one by one, and a vacant bin is arranged between every two nitrogen gas bins and is used as an alloy bin for simultaneously filling the alloy inner core;
step four: is provided with a material blocking boss
Welding the prepared material blocking bosses on the inner wall of the iron sheet shell at the position of the alloy bin at intervals A, wherein A is less than D/5, and D is the diameter of the cored wire; the number of the material blocking bosses in each alloy bin is more than or equal to three;
step five: preparing core-spun yarn
And (3) uniformly arranging the inner core material uniformly stirred in the step (II) in an alloy bin consisting of the two blind plates and the iron sheet shell through a blanking opening distributor of a core-spun yarn unit by using the iron sheet shell provided with the blind plates, and then coating the core-spun yarn by using the core-spun yarn unit to form the composite nitrogen core-spun yarn for steelmaking.
10. The use method of the composite nitrogen cored wire for steelmaking as set forth in claim 1, characterized by comprising the steps of:
the method comprises the following steps: slag breaking
The slag covering the surface of the ladle and positioned around the wire feeding position is broken, so that the cored wire can stably penetrate through the slag and enter molten steel in the wire feeding process;
step two: wire feeding device
Feeding the composite nitrogen cored wire into molten steel at a certain speed by using a cored wire machine to enable the composite nitrogen cored wire to reach the depth of below 1.5m of the surface of a molten steel pool;
step three: dispersion of inner core raw material
The nitrogen in the nitrogen capsule in the gas bin and the alloy bin entering the molten pool expands after being heated, the nitrogen in the gas bin breaks the bin and the nitrogen in the nitrogen capsule breaks the pill to be discharged, a driving force is generated, the alloy bin is pushed to a position far away from the wire feeding position by the gas bin, and the inner core raw material in the alloy bin is pushed to the periphery by the nitrogen capsule, so that the distribution range of the inner core raw material in the molten pool is expanded;
step four: the core raw materials react in molten steel
The nitrogen in the broken gas bin and the nitrogen capsule and the inner core raw material of the core-spun yarn pushed to all positions of the molten pool react with the molten steel, so that nitrogen increase and component microalloying of the molten steel are realized.
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