CN111621617A - Titanium iron nitride, manufacturing method thereof and cored wire - Google Patents
Titanium iron nitride, manufacturing method thereof and cored wire Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 title claims description 21
- 229910001337 iron nitride Inorganic materials 0.000 title claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 103
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 81
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000010936 titanium Substances 0.000 claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 claims abstract description 47
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 46
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 29
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 16
- 238000005049 combustion synthesis Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 14
- 239000010439 graphite Substances 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000011812 mixed powder Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000000498 ball milling Methods 0.000 claims abstract description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 40
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 35
- 238000002844 melting Methods 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 150000004767 nitrides Chemical class 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 239000003085 diluting agent Substances 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 30
- 239000010959 steel Substances 0.000 description 30
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- 229910052758 niobium Inorganic materials 0.000 description 10
- 239000010955 niobium Substances 0.000 description 10
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 10
- 229910052720 vanadium Inorganic materials 0.000 description 10
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 10
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 8
- 239000000047 product Substances 0.000 description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 229910001199 N alloy Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- UGACIEPFGXRWCH-UHFFFAOYSA-N [Si].[Ti] Chemical compound [Si].[Ti] UGACIEPFGXRWCH-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910000592 Ferroniobium Inorganic materials 0.000 description 1
- 229910000628 Ferrovanadium Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 1
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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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
-
- B22F1/0003—
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a titanium nitride iron, a manufacturing method thereof and a cored wire, wherein the titanium nitride iron comprises, by mass, 25-55% of Ti, 7-15% of N, less than or equal to 0.2% of C, less than or equal to 0.04% of S, less than or equal to 0.06% of P, less than or equal to 3.5% of Si, less than or equal to 8.5% of Al, less than or equal to 1.5% of Mn, and the balance of iron. The method comprises the following steps: 1. crushing and ball-milling FeTi30 or FeTi40 ferrotitanium and FeTi70 ferrotitanium to proper fineness; 2. mixing FeTi30 or FeTi40 with FeTi70 ferrotitanium powder; 3. adding a heating agent or a diluent into the ferrotitanium mixed powder and uniformly mixing; 4. the mixture is bulk-packed in a graphite crucible; 5. placing the graphite crucible in a high-pressure synthesis furnace, vacuumizing and then filling nitrogen; 6. igniting after the nitrogen pressure in the high-pressure synthesis furnace reaches a certain pressure; 7. cooling to the temperature below 100 ℃ in the furnace after combustion synthesis; 8. discharging, and crushing the titanium nitride iron to the required size.
Description
Technical Field
The invention belongs to the technical field of ferroalloy, and particularly relates to titanium nitride iron, a manufacturing method thereof and a cored wire containing the titanium nitride iron.
Background
With the continuous development of the world building industry, the requirements of engineering structures such as infrastructure, high-rise buildings and the like on the performance of the reinforcing steel bars are higher and higher. The high strength is the development direction of concrete reinforcing steel bars; it is understood that the utilization rate of the reinforcing steel bars of 400MPa in developed countries such as the United states, the British, Australia and the like reaches 80-90%, and the utilization ratio of the reinforcing steel bars of 400MPa and above also reaches more than 65% in the period of comprehensively promoting the upgrading and updating of the building steel.
The microalloying treatment process is a common means for producing hot-rolled steel bars with the strength of 400MPa or more. Niobium, vanadium and titanium are microalloying elements, and the current process technical route using vanadium and niobium is well developed and widely used by various steel mills. However, the vanadium and niobium resources on earth are very limited, the prices of vanadium and niobium rise all the way with the increase of the use amount of vanadium and niobium, the prices of ferroniobium and ferrovanadium reach 30 ten thousand yuan/ton at present, the price of vanadium-nitrogen alloy reaches 40 ten thousand yuan/ton more, and hot rolled steel bar manufacturers are forbidden. The reserves of titanium in nature are abundant, the price of titanium in the current market is only 1/5-1/8 of niobium and vanadium, and if titanium is used for replacing elements of vanadium and niobium to produce hot rolled steel bars by micro alloying, the manufacturing cost of the steel bars is greatly reduced.
In recent years, metallurgists have studied the production of hot rolled steel bars by titanium microalloying. The research result shows that when the nitrogen content in the steel is too low, a large amount of Ti is dissolved into the matrix, on one hand, the matrix is strengthened to reduce the toughness of the material, and on the other hand, TiN particles precipitated in the steel are coarsened, so that the growth of austenite grains cannot be limited. The effect of improving strength by simply adding titanium in microalloyed steel is limited. The yield strength of the steel can be obviously improved by increasing the nitrogen content of the titanium microalloyed steel. The nitrogen increasing method of titanium microalloyed steel generally has two methods, one is that the nitrogen is blown to the molten steel, the method needs special devices, the yield of the nitrogen is low and the nitrogen content is difficult to control; secondly, the density of the synthetic titanium nitride material is low (the apparent density is lower than 3.0 g/cm) by adding the artificially synthesized titanium nitride into the molten steel3) The melting point is as high as 2950 ℃, and the yield of titanium and nitrogen in steel is low and unstable; titanium nitride is difficult to synthesize and expensive (the current market price is more than 20 ten thousand yuan/ton), and the cost of using titanium nitride to increase the content of titanium and nitrogen in steel is high, so that the aim of reducing the cost by replacing niobium and vanadium with titanium cannot be achieved.
The invention discloses a core-spun yarn high-titanium nitride silicon alloy powder (application number 201611015749.9), which comprises the following elements in percentage by mass: 1.0-2.5% of Al, 5-15% of N, 2.5-5.0% of Mn, 1.0-2.5% of Mg, 40-60% of Ti, less than or equal to 0.1% of P, less than or equal to 0.1% of S, 35-50% of Si and the balance of Fe. The cored wire made of the alloy powder is fed into molten steel for titanium alloying, and has the following defects: 1. the alloy powder contains 35-50% of Si, and for low silicon steel, molten steel is generated to increase silicon, so that the toughness of steel is reduced; for the silicon-containing steel, because the Si content in the steel is high enough, the titanium silicon nitride in the alloy powder is difficult to decompose after the alloy powder is added into the molten steel, and N, Si and Ti in the undecomposed titanium silicon nitride alloy cannot enter the molten steel; 2. the alloy powder has high melting point and low density, and is easy to float upwards and enter slag to be burnt.
In order to achieve the purpose of replacing niobium and vanadium with titanium and reducing the production cost in microalloyed steel, a titanium-nitrogen alloy with low melting point, high compactness and low cost is needed to meet the requirements of titanium and nitrogen increase of titanium microalloyed steel.
Disclosure of Invention
The invention aims to provide the titanium-nitrogen alloy which has the advantages of low production cost, low melting point, high density, high yield of titanium and nitrogen in steel, energy conservation and environmental protection.
The technical problem to be solved can be implemented by the following technical scheme.
The titanium nitride iron comprises 25-55% of Ti, 7-15% of N, and the balance of iron and inevitable impurities by mass percent; wherein, in the inevitable impurities, the mass percent of C is less than or equal to 0.2 percent, the mass percent of S is less than or equal to 0.04 percent, the mass percent of P is less than or equal to 0.06 percent, the mass percent of Si is less than or equal to 3.5 percent, the mass percent of Al is less than or equal to 8.5 percent, and the mass percent of Mn is less than or equal to 1.5 percent relative to the. Ti and N are elements required in titanium microalloyed steel, and a certain content of Fe is added to form a solid solution with titanium and nitrogen, so that the melting point of the alloy is reduced, and the true density and the apparent density of the alloy are improved. The titanium nitride iron can be used as an additive of titanium and nitrogen elements in low-alloy high-strength steel.
As a further improvement of the technical scheme, the content of N (mass%)/the content of Ti (mass%) in the titanium nitride iron is more than or equal to 0.22.
As a further improvement of the technical scheme, the content (mass%) of Fe in the titanium nitride iron is more than or equal to 15, so that a titanium nitride-iron solid solution can be formed, and the low melting point and high density of the alloy are ensured.
As a further improvement of the technical scheme, the titanium nitride iron is a compact blocky substance, and the apparent density is more than or equal to 4.0g/cm3。
As a further improvement of the technical scheme, the melting point of the titanium nitride iron is less than or equal to 1580 ℃.
As a preferred embodiment of the invention, the titanium nitride iron contains 25 to 40 percent of Ti, 7 to 12 percent of N, and the balance of iron and inevitable impurities in percentage by mass; wherein, in the inevitable impurities, the mass percentage of C is less than or equal to 0.2 percent, the mass percentage of S is less than or equal to 0.04 percent, the mass percentage of P is less than or equal to 0.06 percent, the mass percentage of Si is less than or equal to 3.5 percent, the mass percentage of Al is less than or equal to 8.5 percent, and the mass percentage of Mn is less than or equal to 1.5 percent relative to the. The titanium nitride ferrotitanium with the composition is particularly suitable for titanium microalloying in high-strength deformed steel.
Also as a preferred embodiment of the invention, the titanium nitride iron contains 40-55% of Ti, 11-15% of N, and the balance of iron and inevitable impurities by mass percent; wherein, in the inevitable impurities, the mass percent of C is less than or equal to 0.2 percent, the mass percent of S is less than or equal to 0.04 percent, the mass percent of P is less than or equal to 0.06 percent, the mass percent of Si is less than or equal to 3.5 percent, the mass percent of Al is less than or equal to 8.5 percent, and the mass percent of Mn is less than or equal to 1.5 percent relative to the whole titanium. The titanium nitride ferrotitanium is more suitable for titanium microalloying in low-alloy high-strength strip steel.
The invention also aims to provide a method for manufacturing the titanium iron nitride.
In order to solve the technical problems, the invention adopts the following technical scheme.
The production process of titanium nitride iron is characterized by adopting self-propagating high-temperature combustion synthesis process, including the following steps:
1) respectively crushing and ball-milling FeTi30 (or FeTi40) ferrotitanium and/or FeTi70 ferrotitanium to proper fineness;
2) mixing the ball-milled FeTi30 (or FeTi40) ferrotitanium powder and/or FeTi70 ferrotitanium powder into ferrotitanium mixed powder according to a certain proportion according to the titanium content to be achieved by the titanium nitride ferrotitanium;
3) adding a certain proportion of aluminum powder or titanium nitride powder (the titanium nitride powder can be purchased externally, or the titanium nitride obtained by the manufacturing method can be preferably adopted, namely, the titanium nitride obtained by the manufacturing method is continuously circulated from step 3) to step 8) according to the titanium content in the titanium-iron mixed powder, so that the optimization of the titanium content is realized, and fully and uniformly mixing;
4) the uniformly mixed mixture is bulk-loaded in a graphite crucible;
5) placing the graphite crucible in a high-pressure synthesis furnace, sealing, vacuumizing to reach a certain vacuum degree, and filling high-purity nitrogen;
6) igniting when the nitrogen pressure in the high-pressure synthesis furnace reaches a certain pressure, and supplementing nitrogen in time in the reaction process when the reaction is performed spontaneously to keep the nitrogen pressure in the furnace stable;
7) after the combustion synthesis is finished, naturally cooling to the temperature below 100 ℃ in the furnace;
8) and opening the high-pressure synthesis furnace, discharging, and crushing the titanium nitride iron to the required size.
As a further improvement of the technical scheme, 1-5% of aluminum powder is added to supplement heat when the Ti content of the ferrotitanium mixed powder is less than or equal to 32%, and the lower the Ti content is, the higher the aluminum powder adding proportion is. When the Ti content of the ferrotitanium mixed powder is more than or equal to 45 percent, 5 to 25 percent of titanium nitride powder is required to be added as a diluent, and the higher the Ti content is, the higher the adding proportion of the titanium nitride powder is. As a further improvement of the technical scheme, the titanium nitride powder is obtained from the titanium nitride iron prepared by the titanium nitride iron manufacturing method.
As a further improvement of the technical scheme, the granularity of the uniformly mixed mixture is controlled to be less than 80 meshes by mass percent 100 percent, wherein the mass percent of less than 200 meshes is 40-70 percent. Too coarse grain size makes ignition difficult, and too fine grain size not only increases abrasive cost, but also has large nitrogen permeation resistance.
As a further improvement of the technical scheme, the high-pressure synthesis furnace is vacuumized to be below 0.06MPa, titanium oxidation is prevented, and the nitridation rate is improved.
As a further improvement of the technical scheme, the high-pressure synthesis furnace is filled with high-purity nitrogen with the purity of 99.9-99.999 percent, titanium oxidation is prevented, and the nitridation rate is improved.
As a further improvement of the technical scheme, the nitrogen pressure in the high-pressure synthesis furnace reaches more than 8MPa for ignition, and the nitrogen pressure in the furnace is controlled to be 7-9MPa in the synthesis process. Too low a pressure results in a low nitriding rate, and too high a pressure results in waste of nitrogen gas and an increase in production cost.
The invention also aims to provide a cored wire taking the powder of the titanium iron nitride as core powder.
Compared with the prior art, the titanium nitride iron alloy, the manufacturing method thereof and the cored wire adopting the technical scheme have the following beneficial effects:
using low melting point (less than or equal to 1580 ℃) and high apparent density (more than or equal to 4.0 g/mm)3) The titanium nitride iron or titanium nitride iron core-spun yarn is added into molten steel, the titanium yield reaches about 75 percent, the nitrogen yield reaches about 60 percent, the yield is stable, and the requirements of increasing Ti and N of titanium microalloyed steel are met; the titanium nitride iron is manufactured by adopting a self-propagating high-temperature synthesis method, the process is simple, energy is saved and the method is environment-friendly, does not need to provide energy in the nitridation reaction process, has low cost and high density, can realize the purpose of reducing the cost of microalloyed steel by substituting titanium for niobium and vanadium, and has high economic benefit and social benefit.
Drawings
FIG. 1 is a process flow of the method for producing titanium iron nitride according to the present invention.
Detailed Description
The following will further explain the specific embodiments of the present invention in detail with reference to the process flow of the method for manufacturing titanium nitride iron according to the present invention in the attached FIG. 1.
The following specific examples are provided to illustrate the present invention, but the scope of the present invention is not limited to the following examples.
Example 1:
the FeTi30 ferrotitanium and the FeTi70 ferrotitanium are respectively crushed and ball-milled. 68kg of FeTi30 ferrotitanium powder and 12kg of FeTi70 ferrotitanium powder are taken, and the total weight is 80 kg. Mixing with 1.6kg of aluminum powder. The granularity of the mixture is controlled to be less than 80 meshes and 100 percent by mass, wherein the mass percent of less than 200 meshes is 40-70 percent. And (3) the mixture is bulk-loaded in a graphite crucible, the graphite crucible is placed in a high-pressure synthesis furnace, the furnace is sealed and vacuumized to 0.06MPa, and then 99.99% high-purity nitrogen is filled. When the nitrogen pressure in the furnace reaches 8.5MPa, starting an ignition device to carry out self-propagating combustion synthesis reaction. The pressure is maintained at 7.5-8.5 MPa by supplementing nitrogen into the furnace until the combustion synthesis is finished. After the combustion synthesis is finished, naturally cooling to the temperature below 100 ℃ in the furnace. Discharging, and crushing the titanium nitride iron to the required size.
The prepared titanium nitride iron product comprises the following components (mass%): ti31.96, N7.43, Fe 49.67, C0.092, P0.008, S0.015, Si 3.23, Al 7.03 and Mn 0.78, and the apparent density of the product is 5.32g/cm3Melting point 1484 ℃.
Example 2:
the FeTi40 ferrotitanium was crushed and ball milled. 80kg of FeTi40 ferrotitanium powder is taken and mixed with 0.8kg of aluminum powder. The granularity of the mixture is controlled to be less than 80 meshes and 100 percent by mass, wherein the mass percent of less than 200 meshes is 40-70 percent. And (3) the mixture is bulk-loaded in a graphite crucible, the graphite crucible is placed in a high-pressure synthesis furnace, the furnace is sealed and vacuumized to 0.06MPa, and then 99.99% high-purity nitrogen is filled. And when the nitrogen pressure in the furnace reaches 8.5MPa, starting an ignition device to carry out self-propagating combustion synthesis reaction. The pressure is maintained at 7.5-8.5 MPa by supplementing nitrogen into the furnace until the combustion synthesis is finished. After the combustion synthesis is finished, naturally cooling to the temperature below 100 ℃ in the furnace. Discharging, and crushing the titanium nitride iron to the required size.
The prepared titanium nitride iron product comprises the following components (mass%): ti35.48, N8.06, Fe 46.14, C0.084, P0.010, S0.012, Si 2.87, Al 8.11, Mn 0.65, and apparent density of product 4.99g/cm3Melting point 1506 ℃.
Example 3:
the FeTi40 ferrotitanium and the FeTi70 ferrotitanium are respectively crushed and ball-milled. 64kg of FeTi40 titanium powder iron and 16kg of FeTi70 titanium iron powder are taken, and 80kg of the total weight is mixed uniformly. The granularity of the mixture is controlled to be less than 80 meshes and 100 percent by mass, wherein the mass percent of less than 200 meshes is 40-70 percent. And (3) the mixture is bulk-loaded in a graphite crucible, the graphite crucible is placed in a high-pressure synthesis furnace, the furnace is sealed and vacuumized to 0.06MPa, and then 99.99% high-purity nitrogen is filled. And when the nitrogen pressure in the furnace reaches 8.5MPa, starting an ignition device to carry out self-propagating combustion synthesis reaction. The pressure is maintained at 7.5-8.5 MPa by supplementing nitrogen into the furnace until the combustion synthesis is finished. After the combustion synthesis is finished, naturally cooling to the temperature below 100 ℃ in the furnace. Discharging, and crushing the titanium nitride iron to the required size.
The prepared titanium nitride iron product comprises the following components (mass%): ti 41.08, N9.46, Fe 37.52, C0.088, P0.009, S0.014, Si 2.85, Al 7.54, Mn 0.61, and the product apparent density is 4.82g/cm3Melting point 1523 ℃.
Example 4:
the FeTi30 ferrotitanium and the FeTi70 ferrotitanium are respectively crushed and ball-milled. 23kg of FeTi30 ferrotitanium powder and 49kg of FeTi70 ferrotitanium powder are taken, and the total weight is 72 kg. And mixed with 8kg of titanium nitride iron powder. The granularity of the mixture is controlled to be less than 80 meshes and 100 percent by mass, wherein the mass percent of less than 200 meshes is 40-70 percent. And (3) the mixture is bulk-loaded in a graphite crucible, the graphite crucible is placed in a high-pressure synthesis furnace, the furnace is sealed and vacuumized to 0.06MPa, and then 99.99% high-purity nitrogen is filled. And when the nitrogen pressure in the furnace reaches 8.5MPa, starting an ignition device to carry out self-propagating combustion synthesis reaction. The pressure is maintained at 7.5-8.5 MPa by supplementing nitrogen into the furnace until the combustion synthesis is finished. After the combustion synthesis is finished, naturally cooling to the temperature below 100 ℃ in the furnace. Discharging, and crushing the titanium nitride iron to the required size.
The prepared titanium nitride iron product comprises the following components (mass%): ti 50.73, N11.52, Fe 30.47, C0.095, P0.014, S0.011, Si 2.38, Al 4.24, Mn 0.59, and apparent density of product 4.68g/cm3Melting point 1532 ℃.
Example 5: the method for manufacturing the cored wire by using the titanium nitride iron
Crushing the titanium iron nitride to titanium iron nitride powder with the granularity of less than 2mm, and then winding the titanium iron nitride powder into cored wires on a cored wire machine by using a steel strip. The core-spun yarn uses high-quality carbon structural steel with the grade of 08 in the national standard GB/T699-2015 as a steel belt, and comprises the following chemical components: 0.05 to 0.12 percent of C, 0.17 to 0.37 percent of Si, 0.35 to 0.65 percent of Mn, less than or equal to 0.035 percent of S, less than or equal to 0.035 percent of P, less than or equal to 0.1 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.25 percent of Cu, and 0.35 to 0.45mm of steel strip thickness. The technical indexes of the titanium nitride iron core-spun yarn are that the outer diameter is 13.5 +/-0.8 mm, the core powder quality is 400-500 g/m, and the powder-iron ratio is (2.3-2.8): 1.
according to the manufacturing method of the titanium nitride iron core-spun yarn, the titanium nitride iron powder in the titanium nitride iron core-spun yarn can penetrate through the slag layer and enter molten steel, burning loss caused by contact with the slag layer is avoided, and the utilization rate of nitrogen and titanium is high.
Claims (10)
1. The titanium nitride iron is characterized by comprising 25-55% of Ti, 7-15% of N and the balance of iron and inevitable impurities by mass percent; wherein, in the inevitable impurities, the mass percent of C is less than or equal to 0.2 percent, the mass percent of S is less than or equal to 0.04 percent, the mass percent of P is less than or equal to 0.06 percent, the mass percent of Si is less than or equal to 3.5 percent, the mass percent of Al is less than or equal to 8.5 percent, and the mass percent of Mn is less than or equal to 1.5 percent relative to the.
2. A titanium iron nitride according to claim 1, characterized in that the N content (mass%)/Ti content (mass%) > 0.22.
3. A titanium iron nitride according to claim 1, characterized in that the Fe content (mass%) is equal to or more than 15.
4. Titanium iron nitride according to claim 1, characterised in that the titanium iron nitride is a dense mass with an apparent density of 4.0g/cm or more3。
5. A titanium iron nitride according to claim 1, characterized in that the melting point of the titanium iron nitride is 1580 ℃.
6. A titanium iron nitride according to claim 1, wherein the titanium iron nitride contains, in mass%, 25-40% Ti, 7-12% N, and the balance being Fe and unavoidable impurities; wherein the N content/Ti content is more than or equal to 0.22; wherein, in the inevitable impurities, the mass percentage of C is less than or equal to 0.2 percent, the mass percentage of S is less than or equal to 0.04 percent, the mass percentage of P is less than or equal to 0.06 percent, the mass percentage of Si is less than or equal to 3.5 percent, the mass percentage of Al is less than or equal to 8.5 percent, and the mass percentage of Mn is less than or equal to 1.5 percent relative to the.
7. A titanium iron nitride according to claim 1, wherein the titanium iron nitride contains, in mass%, 40-55% Ti, 11-15% N, and the balance being iron and unavoidable impurities; wherein the N content/Ti content is more than or equal to 0.22; wherein, in the inevitable impurities, the mass percentage of C is less than or equal to 0.2 percent, the mass percentage of S is less than or equal to 0.04 percent, the mass percentage of P is less than or equal to 0.06 percent, the mass percentage of Si is less than or equal to 3.5 percent, the mass percentage of Al is less than or equal to 8.5 percent, and the mass percentage of Mn is less than or equal to 1.5 percent relative to the.
8. A process for the production of titanium iron nitride according to any one of claims 1 to 7 which comprises the steps of:
1) crushing and ball-milling one of FeTi30 and FeTi40 ferrotitanium and/or FeTi70 ferrotitanium to proper fineness;
2) mixing one or two ferrotitanium raw materials ball-milled in the step 1) into ferrotitanium mixed powder according to the titanium content required by the ferrotitanium nitride; the granularity of the mixture is controlled to be 100 percent in mass percent of less than 80 meshes, wherein the mass percent of less than 200 meshes is 40-70 percent;
3) adding 1-5% of aluminum powder or 5-30% of titanium nitride powder into the ferrotitanium mixed powder according to the titanium content in the ferrotitanium mixed powder, and fully and uniformly mixing;
4) the uniformly mixed mixture is bulk-packed in a graphite crucible;
5) placing the graphite crucible in a high-pressure synthesis furnace, sealing, vacuumizing to below 0.06MPa, and filling high-purity nitrogen with the purity of 99.9-99.999%;
6) igniting when the nitrogen pressure in the high-pressure synthesis furnace reaches more than 8MPa, and supplementing nitrogen in time during the reaction process when the reaction is performed spontaneously, and controlling the nitrogen pressure in the furnace to be 7-9 MPa;
7) after the combustion synthesis is finished, naturally cooling to the temperature below 100 ℃ in the furnace;
8) and opening the high-pressure synthesis furnace, discharging, and crushing the titanium nitride iron to the required size.
9. The manufacturing method according to claim 8, characterized in that 1-5% of aluminum powder is added when the Ti content of the ferrotitanium mixed powder is less than or equal to 32%, and 5-25% of titanium nitride powder is added when the Ti content of the ferrotitanium mixed powder is more than or equal to 45%; the titanium nitride powder is taken from the titanium nitride iron prepared in claim 8.
10. A cored wire using titanium nitride iron, wherein the core powder is processed from the titanium nitride iron as claimed in any one of claims 1 to 7.
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