CN114774765A - High-nitrogen silicon-titanium alloy and production method thereof - Google Patents
High-nitrogen silicon-titanium alloy and production method thereof Download PDFInfo
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- CN114774765A CN114774765A CN202210418690.7A CN202210418690A CN114774765A CN 114774765 A CN114774765 A CN 114774765A CN 202210418690 A CN202210418690 A CN 202210418690A CN 114774765 A CN114774765 A CN 114774765A
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Abstract
The invention relates to the technical field of alloys, and provides a high-nitrogen silicon-titanium alloy and a production method thereof, wherein the production method comprises the following steps: s1, uniformly mixing ferrotitanium powder and ferrosilicon powder according to the proportion of 1:1-2.5, and grinding to obtain a mixture; s2, adding an auxiliary agent into the mixture, stirring for the second time, uniformly mixing, grinding, and pressing into a blank; s3, putting the blank in a kiln, vacuumizing and introducing nitrogen-containing gas to the pressure of 0.05-0.06 MPa; s4, heating to 1380 and 1450 ℃, preserving the heat for 5-8h, cooling to room temperature, and discharging; in the step S2, the auxiliary agent is a mixture of calcium boride, ammonium ferrous sulfate, and iridium oxide. Through the technical scheme, the problem that the nitrogen content of the alloy in the prior art is not high is solved.
Description
Technical Field
The invention relates to the technical field of alloys, in particular to a high-nitrogen silicon-titanium alloy and a production method thereof.
Background
The high-nitrogen silicon-titanium alloy is a novel steel additive, nitrogen is a strong austenite forming element, the nitrogen is easier to be dissolved in solid solution in an austenite phase than carbon, the effect of inhibiting carbide precipitation in steel is achieved, meanwhile, the strength and corrosion resistance of the steel can be effectively improved, the nitrogen widely exists in the atmosphere, the high-nitrogen silicon-titanium alloy can replace ferrocolumbium, ferrovanadium and the like to carry out steel-making microalloying, the strength of steel is improved, and the like, and the alloy can ensure that the performance of the steel can meet the requirements of technical specifications.
The conventional process for preparing the high-nitrogen silicon-titanium alloy comprises a liquid nitriding process and a solid nitriding process, and the nitrogen content of the alloy obtained by the two methods is relatively low, so that the research on the nitrogen silicon-titanium alloy with the nitrogen content is necessary to improve the performance of steel.
Disclosure of Invention
The invention provides a high-nitrogen silicon-titanium alloy and a production method thereof, which solve the problem of low nitrogen content of the alloy in the prior art.
The technical scheme of the invention is as follows:
a production method of a high-nitrogen silicon-titanium alloy comprises the following steps:
s1, uniformly mixing the ferrotitanium powder and the ferrosilicon powder according to the proportion of 1:1-2.5, and grinding to obtain a mixture;
s2, adding an auxiliary agent into the mixture, stirring for the second time, uniformly mixing, grinding, and pressing into a blank;
s3, putting the blank in a kiln, vacuumizing and introducing nitrogen-containing gas to the pressure of 0.05-0.06 MPa;
s4, heating to 1380 and 1450 ℃, preserving the heat for 5-8h, cooling to room temperature, and discharging;
in the step S2, the auxiliary agent is a mixture of calcium boride, ammonium ferrous sulfate, and iridium oxide.
As a further technical scheme, the auxiliary agent is a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide, and the proportion of the calcium boride, the ammonium ferrous sulfate and the iridium oxide is (2-4): 6-8): 1.
As a further technical scheme, the auxiliary agent is a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide, and the ratio of the calcium boride to the ammonium ferrous sulfate to the iridium oxide is 3:7: 1.
As a further technical scheme, in the step S1, the powder is ground to a particle size smaller than 150 meshes.
As a further technical scheme, in the step S2, the powder is ground to a particle size of less than 100 meshes.
The auxiliary agent and the metal raw material are stirred and ground step by step, so that the difficulty of direct one-step grinding can be reduced, the nitrogen content can be increased, and the absorption rate of nitrogen in steel is reduced when the auxiliary agent and the metal raw material are subsequently applied to steel smelting.
As a further technical scheme, the ferrotitanium powder is FeTi70, and the ferrosilicon powder is TFeSi 75.
As a further technical scheme, the adding mass of the auxiliary agent is 0.5 percent of the mass of the ferrotitanium powder.
The invention also provides the high-nitrogen silicon-titanium alloy obtained by the production method of the high-nitrogen silicon-titanium alloy.
As a further technical scheme, the high-nitrogen silicon-titanium alloy comprises the following chemical compositions in percentage by mass: 14% -30% of titanium, 25% -40% of silicon, 20% -40% of nitrogen and the balance of iron and inevitable impurities.
The beneficial effects of the invention are as follows:
1. the micro-crystallization alloy prepared by the production method has the nitrogen content of 20-30%, the alloy is added into a ton of steel, the hit rate of nitrogen control in the steel is 100%, and the absorption rate of nitrogen in the steel can reach about 82%.
2. The invention provides a method for producing a high-nitrogen silicon-titanium alloy, which adopts step-by-step stirring to reduce the stirring difficulty on one hand, and adds calcium boride, ammonium ferrous sulfate and iridium oxide as auxiliary agents, wherein the three auxiliary agents can synergize synergistically to play a role in nitrogen fixation, the nitrogen content can be greatly improved, the microcrystallization of steel is promoted, and the nitrogen content and the absorption rate of nitrogen in the steel are improved to a certain extent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall relate to the scope of protection of the present invention.
Example 1
A production method of a high-nitrogen silicon-titanium alloy comprises the following steps:
s1, uniformly mixing ferrotitanium powder (FeTi70) and ferrosilicon powder (TFeSi75) according to the proportion of 1:1, grinding the mixture into powder, and grinding the powder into powder with the granularity smaller than 150 meshes to obtain a mixture;
s2, adding an auxiliary agent into the mixture, stirring for the second time, uniformly mixing, grinding to a particle size of less than 100 meshes, and pressing into a blank; adding a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide in a ratio of 3:7:1, wherein the mass of the mixture is 0.5% of that of the ferrotitanium powder, and the auxiliary agent is a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide;
s3, putting the blank in a kiln, vacuumizing, and introducing nitrogen to a pressure of 0.05 MPa;
s4, heating to 1450 ℃, preserving heat for 8 hours, cooling to room temperature, and discharging;
the chemical composition of the material comprises the following components in percentage by mass: 27.6% of titanium, 29.4% of silicon, 21.2% of nitrogen and the balance of iron and inevitable impurities.
The alloy is added into a ton of steel by 0.5kg to produce HRB335 steel bar, and the absorption rate of nitrogen in the steel is 82.31 percent.
Example 2
A production method of a high-nitrogen silicon-titanium alloy comprises the following steps:
s1, uniformly mixing ferrotitanium powder (FeTi70) and ferrosilicon powder (TFeSi75) according to the proportion of 1:2, grinding the mixture into powder, and grinding the powder into powder with the granularity smaller than 150 meshes to obtain a mixture;
s2, adding an auxiliary agent into the mixture, stirring for the second time, uniformly mixing, grinding to a particle size of less than 100 meshes, and pressing into a blank; adding a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide with the mass accounting for 0.5 percent of the mass of the ferrotitanium powder as an auxiliary agent, wherein the ratio of the calcium boride to the ammonium ferrous sulfate to the iridium oxide is 2:8: 1;
s3, putting the blank in a kiln, vacuumizing, and introducing nitrogen to a pressure of 0.06 MPa;
s4, heating to 1450 ℃, preserving heat for 9h, cooling to room temperature, and discharging;
the chemical composition of the material comprises the following components in percentage by mass: 16.3% of titanium, 35.0% of silicon, 29.1% of nitrogen and the balance of iron and inevitable impurities.
0.5kg of the alloy is added into one ton of steel to produce HRB335 reinforced steel bar, and the absorption rate of nitrogen in the steel is 81.95%.
Example 3
A production method of a high-nitrogen silicon-titanium alloy comprises the following steps:
s1, uniformly mixing ferrotitanium powder (FeTi70) and ferrosilicon powder (TFeSi75) according to the proportion of 1:2.2, grinding the mixture into powder, and grinding the powder to the granularity of less than 150 meshes to obtain a mixture;
s2, adding an auxiliary agent into the mixture, stirring for the second time, uniformly mixing, grinding to a particle size smaller than 100 meshes, and pressing into a blank; adding a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide with the mass accounting for 0.5 percent of the mass of the ferrotitanium powder as an auxiliary agent, wherein the ratio of the calcium boride to the ammonium ferrous sulfate to the iridium oxide is 2:6: 1;
s3, putting the blank in a kiln, vacuumizing, and introducing nitrogen to a pressure of 0.05 MPa;
s4, heating to 1450 ℃, preserving heat for 8 hours, cooling to room temperature, and discharging;
the chemical composition of the material comprises the following components in percentage by mass: 14.0% of titanium, 33.3% of silicon, 24.5% of nitrogen, and the balance of iron and inevitable impurities.
When 0.5kg of the alloy is added into one ton of steel to produce HRB335 steel bar, the absorption rate of nitrogen in the steel is 82.08%.
Comparative example 1
A production method of a high-nitrogen silicon-titanium alloy comprises the following steps:
s1, uniformly mixing ferrotitanium powder (FeTi70) and ferrosilicon powder (TFeSi75) according to the proportion of 1:2.2, adding an auxiliary agent, wherein the mass of the auxiliary agent is 0.5% of the mass of the ferrotitanium powder, the auxiliary agent is a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide, the proportion of the three is 2:6:1, uniformly mixing, and grinding until the granularity is smaller than 100 meshes;
s2, pressing into a blank;
s3, putting the blank in a kiln, vacuumizing, and introducing nitrogen to a pressure of 0.06 MPa;
s4, heating to 1450 ℃, preserving heat for 8 hours, cooling to room temperature, and discharging;
the chemical composition of the material comprises the following components in percentage by mass: 17.0% of titanium, 40.1% of silicon, 22.1% of nitrogen and the balance of iron and inevitable impurities.
The alloy is added into a ton of steel by 0.5kg to produce HRB335 steel bar, and the absorption rate of nitrogen in the steel is 80.06%.
Comparative example 2
The process is similar to that of example 2 except that the calcium ammonium boride in the adjuvant is replaced by an equivalent amount of ferrous ammonium sulfate.
The chemical composition of the material comprises the following components in percentage by mass: 17.3% of titanium, 19.8% of silicon, 25.2% of nitrogen and the balance of iron and inevitable impurities.
0.5kg of the alloy is added into one ton of steel to produce HRB335 reinforced steel bar, and the absorption rate of nitrogen in the steel is 80.70%.
Comparative example 3
The difference from example 2 is that the iridium oxide in the adjuvant is replaced by an equivalent amount of ferrous ammonium sulfate, and the other steps are the same as example 2.
The chemical composition of the material comprises the following components in percentage by mass: 17.1% of titanium, 19.6% of silicon, 26.0% of nitrogen and the balance of iron and inevitable impurities.
0.5kg of the alloy is added into one ton of steel to produce HRB335 reinforced steel bar, and the absorption rate of nitrogen in the steel is 80.46%.
Comparative example 4
Compared with the example 2, the difference is that the auxiliary agent is only ferrous ammonium sulfate, and the rest is the same as the example 2.
The chemical composition of the material comprises the following components in percentage by mass: 17.8% of titanium, 20.5% of silicon, 23.3% of nitrogen and the balance of iron and inevitable impurities.
When 0.5kg of the alloy is added into per ton of steel to produce HRB335 steel bar, the absorption rate of nitrogen in the steel is 79.11%.
According to the invention, the auxiliary agent and the metal raw material are stirred and ground step by step, so that the difficulty of direct one-step grinding can be reduced, the nitrogen content can be increased, the nitrogen content of the alloy obtained by directly mixing in the comparative example 1 is reduced compared with that in the example 3, and the absorption rate of nitrogen in steel is reduced when the alloy is subsequently applied to steel smelting. As for the auxiliary agents, the three auxiliary agents are compounded synergistically to play roles in fixing nitrogen and improving the nitrogen content, compared with the embodiment 2, calcium boride and iridium oxide are not added in the comparative example 4, the nitrogen content and the absorption rate of nitrogen in the alloy in steel are greatly reduced, calcium boride is not added in the comparative example 2, iridium oxide is not added in the comparative example 3, and compared with the comparative example 4, the nitrogen content and the absorption rate of nitrogen in steel are improved to a certain extent.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The production method of the high-nitrogen silicon-titanium alloy is characterized by comprising the following steps of:
s1, uniformly mixing ferrotitanium powder and ferrosilicon powder according to the proportion of 1:1-2.5, and grinding to obtain a mixture;
s2, adding an auxiliary agent into the mixture, stirring for the second time, uniformly mixing, grinding, and pressing into a blank;
s3, putting the blank in a kiln, vacuumizing and introducing nitrogen-containing gas to the pressure of 0.05-0.06 MPa;
s4, heating to 1380 and 1450 ℃, preserving the heat for 5-8h, cooling to room temperature, and discharging;
in the step S2, the auxiliary agent is a mixture of calcium boride, ammonium ferrous sulfate, and iridium oxide.
2. The method for producing the high-nitrogen silicon-titanium alloy as claimed in claim 1, wherein the assistant is a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide, and the ratio of the calcium boride to the ammonium ferrous sulfate to the iridium oxide is (2-4): 6-8): 1.
3. The production method of the high-nitrogen silicon-titanium alloy according to claim 2, wherein the auxiliary agent is a mixture of calcium boride, ammonium ferrous sulfate and iridium oxide, and the ratio of the calcium boride to the ammonium ferrous sulfate to the iridium oxide is 3:7: 1.
4. The method for producing a high-nitrogen silicon-titanium alloy according to claim 1, wherein in the step S1, the powder is ground to a particle size of less than 150 meshes.
5. The method for producing a high-nitrogen silicon-titanium alloy according to claim 1, wherein in the step S2, the powder is ground to a particle size of less than 100 meshes.
6. The method for producing the high-nitrogen silicon-titanium alloy according to claim 1, wherein the ferrotitanium powder is FeTi70, and the ferrosilicon powder is TFeSi 75.
7. The method for producing a high-nitrogen silicon-titanium alloy as claimed in claim 1, wherein the mass of the additive added is 0.5% of the mass of the ferrotitanium powder.
8. The high nitrogen silicon titanium alloy obtained by the method for producing the high nitrogen silicon titanium alloy according to any one of claims 1 to 7.
9. The high nitrogen silicon titanium alloy according to claim 8, wherein the chemical composition comprises, in mass percent: 14% -30% of titanium, 25% -40% of silicon, 20% -40% of nitrogen and the balance of iron and inevitable impurities.
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