CN111519085B - Antimony-containing weathering steel and smelting method and application thereof - Google Patents
Antimony-containing weathering steel and smelting method and application thereof Download PDFInfo
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- CN111519085B CN111519085B CN202010516231.3A CN202010516231A CN111519085B CN 111519085 B CN111519085 B CN 111519085B CN 202010516231 A CN202010516231 A CN 202010516231A CN 111519085 B CN111519085 B CN 111519085B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Abstract
The invention discloses antimony-containing weathering steel and a smelting method and application thereof, wherein the method comprises the steps of obtaining electric furnace smelting molten steel; carrying out vacuum treatment on the electric furnace smelting molten steel to obtain vacuum treatment molten steel; the vacuum treatment pressure is less than or equal to 67Pa, and the temperature of the vacuum treatment molten steel is 1635-1700 ℃; and adding ferroantimony into the vacuum treated molten steel for component adjustment to obtain molten antimony-containing steel. The method of the invention realizes the uniform components of Sb element, the yield is more than 96 percent, the cost is reduced, and the method is simple and easy to popularize.
Description
Technical Field
The invention belongs to the technical field of steelmaking, and particularly relates to antimony-containing weathering steel, and a smelting method and application thereof.
Background
The weathering steel, i.e. weathering corrosion resistant steel, is made of plain carbon steel with a small amount of corrosion resistant elements such as copper, nickel and the like added. The weather resistance is 2-8 times of that of plain carbon steel, and meanwhile, the weather-resistant steel has the characteristics of rust resistance, corrosion resistance of members and the like. The weathering steel is generally applied to manufacturing structural members such as containers, railway vehicles, oil derricks, harbor buildings, oil production platforms, chemical petroleum equipment and the like. As for the weathering steel for manufacturing the fastener, the weathering steel has the characteristics of groove corrosion due to the adoption of a threaded connection mode, has more severe corrosion adverse conditions compared with a matched plate, and requires that the raw materials of the fastener have higher corrosion resistance matching than the matched material in the service process. Therefore, it is necessary to add Sb element to steel, and the addition of Sb can improve the uniform corrosion resistance of steel and is excellent in pitting corrosion resistance.
At present, Sb-containing weathering steel is added in the smelting process, and the adding time of Sb alloy is generally added in the tapping process of an electric furnace. And because the steel for the fastener needs to be subjected to cold drawing and cold upsetting deformation treatment when a mechanical part is prepared, N element influencing the cold drawing and cold upsetting performance needs to be reduced as much as possible, so that the steel for the weather-resistant fastener needs to be subjected to vacuum treatment in the smelting process, but the content of Sb element with low boiling point in the steel is almost zero after the vacuum treatment, and the yield is low.
Disclosure of Invention
The invention provides a smelting method of antimony-containing weathering steel, which aims to solve the problem that the yield is almost zero when Sb is alloyed in the prior art.
In one aspect, the embodiment of the invention provides a smelting method of antimony-containing weathering steel, which comprises the following steps,
obtaining electric current smelting molten steel;
carrying out vacuum treatment on the electric furnace smelting molten steel to obtain vacuum treatment molten steel; the vacuum treatment pressure is less than or equal to 67Pa, and the temperature of the vacuum treatment molten steel is 1635-1700 ℃;
and adding ferroantimony into the vacuum treated molten steel for component adjustment to obtain molten antimony-containing steel.
Further, the vacuum treatment time is more than or equal to 20 min.
Further, the vacuum treatment is any one of the following: RH vacuum treatment and VD vacuum treatment.
Further, the method for adding the antimony iron into the vacuum treatment molten steel for component adjustment to obtain the antimony-containing molten steel comprises the following steps of,
firstly adding antimony iron, then adding a titanium wire and boron iron into the vacuum-treated molten steel, and simultaneously carrying out soft argon blowing stirring to obtain antimony-containing molten steel;
the flow of the soft argon blowing is 30-50 NL/min, and the time of the soft argon blowing is 10-20 min.
Further, continuously casting the antimony-containing molten steel to obtain antimony-containing weathering steel; in the continuous casting, the superheat degree of the molten antimony-containing liquid is 30-40 ℃.
Further, the temperature of the electric furnace for smelting molten steel is 1620-1650 ℃.
Further, the vacuum processing of the molten steel includes,
carrying out LF refining and vacuum treatment on the molten steel; and in the LF refining, slagging is controlled, so that the alkalinity of slag after slagging is 4-6.
Further, in the LF refining, an aluminum wire is fed into the molten steel, so that the mass fraction of Al in the molten steel is more than or equal to 0.04%.
In a second aspect, the invention provides antimony-containing weathering steel which is prepared by the smelting method of the antimony-containing weathering steel, wherein the mass fraction of antimony in the antimony-containing weathering steel is 0.09-0.11%.
In a third aspect, the invention provides application of the antimony-containing weathering steel, and the antimony-containing weathering steel is used for manufacturing fasteners.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the embodiment of the invention provides antimony-containing weathering steel and a smelting method and application thereof, wherein the method comprises the steps of obtaining electric furnace smelting molten steel; carrying out vacuum treatment on the electric furnace smelting molten steel to obtain vacuum treatment molten steel; the vacuum treatment pressure is less than or equal to 67Pa, and the temperature of the vacuum treatment molten steel is 1635-1700 ℃; and adding ferroantimony into the vacuum treated molten steel for component adjustment to obtain molten antimony-containing steel. The boiling point of the antimony element is low, which is only 1635 ℃, the conventional alloy adding time is in the electric furnace tapping process, the conventional adding time can lead the low-boiling antimony element to be converted into gaseous state under the condition of high-temperature molten steel, and meanwhile, the Sb is difficult to be added into the molten steel due to low gas phase partial pressure and violent evaporation under the condition of vacuum refining of the gaseous antimony, so that the yield of the antimony element is almost zero. According to the method, after vacuum breaking, the antimony iron is added, on one hand, the molten steel is subjected to vacuum treatment, the temperature can be reduced, and on the other hand, the vacuum treatment is avoided after antimony alloying, so that the yield of antimony is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a diagram illustrating the steps of a method for smelting antimony-containing weathering steel according to an embodiment of the present invention;
FIG. 2 is the effect of corrosion resistance of steel for fasteners with added Sb element;
fig. 3 is a corrosion diagram of the fastener steel to which no Sb element is added.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
in one aspect, the invention provides a method for smelting antimony-containing weathering steel, fig. 1 is a step diagram of a method for smelting antimony-containing weathering steel according to an embodiment of the invention, and with reference to fig. 1, the method includes,
and S1, obtaining electric furnace smelting molten steel.
Further, the mass fraction of the electric furnace smelting end point C is 0.05-0.10%.
Further, the temperature of the electric furnace for smelting molten steel is 1620-1650 ℃.
Further, after the electric furnace smelting is finished, tapping the molten steel, and adding an aluminum product into the tapped molten steel for deoxidation to ensure that the concentration of the oxygen in the tapped molten steel per million is less than or equal to 10 ppm. The aluminum product can be selected from aluminum iron and aluminum ingot.
And S2, performing LF refining and vacuum treatment on the molten steel to obtain vacuum treated molten steel.
Further, in the LF refining, slagging is controlled, so that the alkalinity of slag after slagging is 4-6. Slag basicity in this application refers to CaO and SiO in the slag2The ratio of the mass fraction of (c). The high-alkalinity furnace slag is beneficial to removing sulfur in the molten steel. The slag comprises the following components in percentage by mass: CaO: 45.0-55.0% of SiO2：10.0～15.0％，MgO：7.0～11.0％，Al2O3:20.0-25.0％。
Further, in the slagging, a deoxidizer is added into the slag to deoxidize the slag, and the deoxidizer is at least one of the following: aluminum particles and calcium carbide. The oxygen in the slag can be removed by adding a deoxidizer, which is more beneficial to removing sulfur in the molten steel. In actual operation, the aluminum particles and the calcium carbide are added into the slag in 2-3 batches for slag deoxidation. The carbide in this application refers to silicon carbide.
Further, the vacuum treatment pressure is less than or equal to 67Pa, and the temperature of the vacuum treatment molten steel is 1635-1700 ℃;
after the vacuum treatment is finished, the lower the temperature of the molten steel is, the more beneficial the improvement of the yield of the antimony element is, but the temperature of the molten steel cannot be too low, otherwise, the molten steel is solidified and cannot be cast smoothly. And under the influence of on-site furnace volume and different station distances, the lower the temperature of the vacuum treatment molten steel is, the more beneficial the improvement of the yield of the antimony element is on the premise of meeting the superheat degree. The lower the vacuum treatment pressure is, the more beneficial the nitrogen in the molten steel can be removed.
Further, in the LF refining, an aluminum wire is fed into the molten steel, so that the mass fraction of Al in the molten steel is more than or equal to 0.04%.
Feeding an aluminum wire, on one hand, controlling oxygen in steel, creating a low-oxidation environment and being beneficial to desulfurization; on the other hand, the acid-soluble aluminum can fix nitrogen in the molten steel during the solidification of the molten steel. In the third aspect, acid-soluble Al in the steel is precipitated in the rolling process to fix free N elements, so that the work hardening rate is reduced, the cold processing performance of the steel is improved, and the effects of fixing N and protecting B are achieved. The mass fraction of Al in molten steel is made to be more than or equal to 0.04%, which means that the mass fraction of Al is kept to be more than or equal to 0.04% in LF refining. The specific operation can be that after sampling every time, whether an aluminum wire is fed or not is selected according to the detection result of the components.
Further, the vacuum treatment time is more than or equal to 20 min. The vacuum refining can remove nitrogen in the molten steel, thereby improving the cold drawing and cold upsetting performance of the steel for the stibium-containing fastener.
Further, the vacuum treatment is any one of the following: RH vacuum treatment and VD vacuum treatment. The vacuum refining mode can be flexibly selected according to the requirements of steel types, for example, RH vacuum refining can be selected for steel with the carbon content of less than or equal to 0.02%, and VD vacuum refining can be selected for steel with the carbon content of more than or equal to 0.1%.
And S3, adding antimony iron, titanium wires and boron iron into the vacuum treated molten steel, and simultaneously carrying out soft argon stirring to obtain antimony-containing molten steel.
Sufficient time and kinetic conditions are needed for the antimony and iron to be alloyed uniformly, so that the antimony and iron are added firstly after the vacuum is broken. The order of addition of the titanium wire and ferroboron is not required. It should be noted that, when the titanium wire is fed, the molten steel may be turned over, and the liquid level is exposed, so that the molten steel is polluted, and if ferroboron is added first and then the titanium wire is fed, the yield of boron element may be reduced; if the titanium wire is fed first and then the ferroboron is added, the Ti element is more active in the steel, the activity of the boron element is increased, and the uniformity is easier. In actual production, calcium wires are required to be fed after vacuum breaking to denature the inclusions, and in order to save time, the calcium wires and the titanium wires can be fed at the same time. The specific operation condition can be controlled according to the equipment and the production rhythm of the production field.
The Ti element is more active in steel, has strong binding capacity with the N element and plays a role of fixing N and protecting B by matching with the Al element; the trace B can greatly improve the hardenability of the steel, has low price and replaces precious elements such as Mo, Ni, Cr and the like, and reduces the cost.
Further, the flow rate of the soft argon blowing is 30-50 NL/min, and the time of the soft argon blowing is 10-20 min. Through soft blowing, the antimony, titanium and boron in the molten steel are uniform, the temperature is uniform, and the floating of inclusions is promoted.
And S4, continuously casting the antimony-containing molten steel to obtain the antimony-containing weathering steel.
The boiling point of the antimony element is low, which is only 1635 ℃, and the conventional alloy adding time is in the electric furnace tapping process. Because the electric furnace smelting raw material is scrap steel, the nitrogen content at the end point of the electric furnace smelting is high, and therefore the electric furnace smelting-LF refining-vacuum refining-continuous casting process flow is required to be adopted, two refining processes of LF refining and vacuum refining are arranged under the process flow, and the vacuum pressure maintaining time is limited by strict duration, so that the molten steel temperature at the beginning of vacuum refining also needs to be controlled at 1670 ℃ for the continuous casting starting times on the premise that the temperature of the molten steel in a tundish can enable continuous casting to be carried out smoothly; the minimum starting temperature for continuous casting intermediate furnace vacuum refining is 1640 ℃. The starting temperature of vacuum refining exceeds the boiling point of Sb, and vacuum treatment at the temperature can lead Sb to sublimation and can not be smoothly added into molten steel, so that the yield of the Sb is almost zero. According to the method, after vacuum breaking, the antimony iron is added, on one hand, the temperature of the molten steel is lower than that of LF refining, and on the other hand, vacuum refining treatment is avoided after antimony alloying, so that the yield of antimony is improved.
Further, in the continuous casting, the superheat degree of the molten antimony-containing liquid is 30-40 ℃.
In order to increase the yield of antimony, the temperature at which the vacuum treatment is completed is reduced as much as possible, but the temperature should not be too low, and it is necessary to take into consideration that the molten steel needs a certain degree of superheat to allow smooth casting.
On the other hand, the invention provides antimony-containing weathering steel which is prepared by the smelting method and comprises the following chemical components in percentage by mass: c: 0.20 to 0.25 percent; si: 0.15 to 0.25 percent; mn: 0.78% -0.83%; p is less than or equal to 0.015 percent; s is less than or equal to 0.015 percent; and (3) Alt: 0.020% -0.040%; cu: 0.30 to 0.35 percent; ti: 0.045% -0.055%; b: 0.0010 to 0.0030 percent; sb: 0.09-0.11 percent, less than or equal to 0.0060 percent of N and the balance of Fe and inevitable impurities.
The Sb element can improve the corrosion resistance of the steel, and the main action mechanism is that compact Sb is formed on the surface of the steel2O5A protective rust layer having excellent pitting corrosion resistance and acid resistance (HCl, H)2SO4) Environmental pitting is particularly effective. Fig. 2 is an effect of corrosion resistance of the steel for a fastener to which Sb element is added, and fig. 3 is a corrosion diagram of the steel for a fastener to which Sb element is not added. The Sb element is lower than 0.09%, the local corrosion phenomenon still exists, and the effect is not obvious; sb content is higher than 0.11%, and problems such as grain boundary segregation, hot workability, toughness and the like can occur.
In a third aspect, the invention provides application of the antimony-containing weathering steel to manufacturing of fasteners.
The tropical and subtropical regions of the south of the continental Asia of the south China sea are characterized in that the tropical marine climate is remarkable, belongs to the typical environments of high temperature, high humidity, high salt spray, strong radiation and high chloride ion concentration, and puts higher requirements on the service durability of island reef engineering buildings. The antimony-containing weathering steel is steel for antimony-containing weathering fasteners with the tensile strength of 1000MPa, and can be used for corrosion-resistant capital construction fasteners of island reefs in south China sea.
The application provides antimony-containing weathering steel and a smelting method and application thereof, and in the technical process of electric furnace smelting, LF refining, vacuum refining and continuous casting, Sb element is added after vacuum breaking, so that the Sb element is uniform in component and the yield is more than 96%. Meanwhile, the N in the steel is reduced to 60ppm, so that the steel for the fastener has good cold drawing and cold upsetting performances. The Sb element has high yield, the cost is reduced, and the method is simple and easy to popularize.
The method for producing a steel for an antimony-containing fastener according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
The following examples were used to smelt antimony containing weathering fasteners steel using a 60 ton ladle scrap electric furnace smelting-LF-VD-CC process.
Example 1:
1) electric furnace smelting end point C: 0.07%, molten steel temperature: 1633 deg.C; adding aluminum iron for deoxidation in the tapping process until the oxygen activity of molten steel in an LF station is 5 ppm;
2) LF refining, feeding aluminum wires into molten steel, adjusting the content of C, Si, Mn, Cu, P and S elements to a control range, adding aluminum particles and calcium carbide on the slag surface for indirect deoxidation, wherein the alkalinity R of refining slag is 4.7, and the slag comprises the following components in percentage by mass: CaO: 52.3% of SiO2：11.1％，MgO：8.6％，Al2O323.7 percent, and the balance of impurities. The mass fractions of the elements in the sampled molten steel in the LF refining process are shown in Table 1;
TABLE 1
| Location and time of sampling | C/％ | Si/％ | Mn/％ | Cu/％ | P/％ | S/％ | Alt/％ |
| End point of electric furnace smelting | 0.07 | - | - | 0.05 | 0.003 | 0.032 | - |
| LF first sampling | 0.13 | 0.13 | 0.74 | 0.28 | 0.006 | 0.007 | 0.0451 |
| LF second sampling | 0.18 | 0.17 | 0.78 | 0.33 | 0.006 | 0.002 | 0.0470 |
| LF third sampling | 0.2 | 0.19 | 0.83 | 0.31 | 0.006 | 0.01 | 0.0421 |
3) VD refining at the station entering temperature of 1692 ℃, wherein the gas pressure P is 67Pa during vacuum treatment, and the pressure maintaining time is 21 min;
4) after vacuum breaking by VD, the temperature is 1645 ℃, and the alloy is added according to the following sequence: SbFe → feeding Ca-Fe line + Ti line → adding BFe to realize alloying, wherein the mass fraction of Sb in SbFe is 99.4%, adding SbFe66kg, and the mass percentages of Sb, Ti and B elements in molten steel are shown in Table 2 after the alloying components reach the standard.
5) After VD components are adjusted to reach the standard, the steel ladle is stirred by soft argon blowing, the argon flow is 38NL/min, and the holding time is 12 min.
6) And (4) hoisting the steel ladle to a large ladle rotary platform, and continuously casting steel at the superheat degree of 33 ℃ to obtain the antimony-containing weathering steel. Molten steel in the tundish is sampled, and the mass percentages of detected Sb, Ti and B elements are shown in Table 2.
TABLE 2
In this example, the yield of Sb element reached 96%.
Example 2:
1) electric furnace smelting end point C: 0.08%, molten steel temperature: 1631 deg.C; adding aluminum iron for deoxidation in the tapping process until the oxygen activity of molten steel in an LF (ladle furnace) station is 4 ppm;
2) LF refining, feeding aluminum wires into molten steel, adjusting the content of C, Si, Mn, Cu, Ni, Cr, P and S elements to a control range, adding aluminum particles into a slag surface for indirect deoxidation, wherein the alkalinity R of refining slag is 5.2, and the slag comprises the following components in percentage by mass: CaO: 54.5% of SiO2：10.48％，MgO：8.9％，Al2O321.7 percent, and the balance of impurities. The mass percentages of the elements in the sampled molten steel in the LF smelting process are shown in Table 3;
TABLE 3
| Location and time of sampling | C/％ | Si/％ | Mn/％ | Cu/％ | P/％ | S/％ | Alt/％ |
| End point of electric furnace smelting | 0.08 | - | - | 0.04 | 0.003 | 0.045 | - |
| LF first sampling | 0.14 | 0.12 | 0.73 | 0.27 | 0.004 | 0.013 | 0.0515 |
| LF secondSub-sampling | 0.20 | 0.19 | 0.80 | 0.31 | 0.004 | 0.008 | 0.0473 |
| LF third sampling | 0.21 | 0.20 | 0.83 | 0.31 | 0.004 | 0.008 | 0.04553 |
3) VD refining at the station entering temperature of 1692 ℃, wherein the gas pressure P is 63Pa during vacuum treatment, and the pressure maintaining time is 20 min;
4) after breaking vacuum by VD, the temperature is 1655 ℃, and the alloy is added according to the following sequence: SbFe → feeding Ca-Fe line + Ti line → adding BFe to realize alloying, wherein the mass fraction of Sb in SbFe is 99.6%, adding SbFe67kg, and the mass percentages of Sb, Ti and B elements in molten steel are shown in Table 4 after the alloying components reach the standard.
5) After VD components are adjusted to reach the standard, the ladle is stirred by soft argon blowing, the argon flow is 42NL/min, and the holding time is 15 min.
6) And (3) hoisting the steel ladle to a large ladle rotary platform, and continuously casting steel at the superheat degree of 35 ℃ to obtain the antimony-containing weathering steel. Molten steel in the tundish is sampled, and the mass percentages of detected Sb, Ti and B elements are shown in Table 4.
TABLE 4
In this example, the yield of Sb element reached 97%.
Example 3
1) Electric furnace smelting end point C: 0.08%, molten steel temperature: 1631 deg.C; adding aluminum iron for deoxidation in the tapping process until the oxygen activity of molten steel in an LF (ladle furnace) station is 4 ppm;
2) LF refining, feeding an aluminum wire into molten steel, adjusting the content of C, Si, Mn, Cu, Ni, Cr, P and S elements to a control range, adding calcium carbide on a slag surface for indirect deoxidation, wherein the alkalinity R of refining slag is 5.2, and the slag comprises the following components in percentage by mass: CaO: 52.3% of SiO2：10.05％，MgO：10.1％，Al2O324.7 percent, and the balance of impurities. The mass percentages of the elements in the sampled molten steel in the LF refining process are shown in Table 5;
TABLE 5
3) VD refining at 1693 deg.C under vacuum pressure P of 63Pa for 20 min;
4) after breaking vacuum by VD, the temperature is 1658 ℃, and the alloy is added in the following order: SbFe → feeding Ca-Fe line + Ti line → adding BFe to realize alloying, wherein the mass fraction of Sb in SbFe is 98.1%, adding SbFe68kg, and the mass percentages of Sb, Ti and B elements in molten steel are shown in Table 6 after the alloying components reach the standard.
5) After VD components are adjusted to reach the standard, the ladle is stirred by soft argon blowing, the argon flow is 42NL/min, and the holding time is 15 min.
6) And hoisting the steel ladle to a large ladle rotary platform, and continuously casting steel at the superheat degree of 38 ℃ to obtain the antimony-containing weathering steel. Molten steel in the tundish was sampled, and the mass percentages of the detected Sb, Ti and B elements were as shown in Table 6.
TABLE 6
In this example, the yield of Sb element reached 97%.
Comparative example 1
The smelting process comprises electric furnace smelting, LF refining, VD refining and continuous casting in sequence.
1) Electric furnace smelting end point C: 0.08%, molten steel temperature: 1631 deg.C; adding aluminum iron for deoxidation in the tapping process, and adding antimony iron for alloying to ensure that the mass fraction of antimony is 0.11%.
2) LF refining, adjusting the content of C, Si, Mn, Cu, Ni, Cr, P and S elements to a control range.
3) VD refining, wherein the gas pressure P is 63Pa during vacuum treatment, and the pressure maintaining time is 20 min; and after VD refining is finished, sampling and detecting that the mass fraction of the Sb element in the molten steel is 0.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (4)
1. A smelting method of antimony-containing weathering steel is characterized by comprising the following steps,
obtaining electric furnace smelting molten steel;
carrying out vacuum treatment on the electric furnace smelting molten steel to obtain vacuum treatment molten steel; the vacuum treatment pressure is less than or equal to 67Pa, and the temperature of the vacuum treatment molten steel is 1635-1700 ℃;
adding ferroantimony into the vacuum treated molten steel for component adjustment to obtain molten steel containing ferroantimony;
the vacuum treatment time is more than or equal to 20 min;
the vacuum treatment is any one of the following: RH vacuum treatment and VD vacuum treatment;
the method for adding the stibium-iron into the vacuum treatment molten steel for component adjustment to obtain the stibium-containing molten steel comprises the following steps,
firstly adding antimony iron, then adding a titanium wire and boron iron into the vacuum-treated molten steel, and simultaneously carrying out soft argon blowing stirring to obtain antimony-containing molten steel;
the flow of the soft argon blowing is 30-50 NL/min, and the time of the soft argon blowing is 10-20 min;
continuously casting the antimony-containing molten steel to obtain antimony-containing weathering steel; in the continuous casting, the superheat degree of the molten antimony-containing liquid is 30-40 ℃;
the temperature for smelting molten steel by the electric furnace is 1620-1650 ℃;
the vacuum treatment of the molten steel comprises the following steps,
performing LF refining and vacuum treatment on the molten steel; and in the LF refining, slagging is controlled, so that the alkalinity of slag after slagging is 4-6.
2. The smelting method of antimony-containing weathering steel according to claim 1, characterized in that in the LF refining, aluminum wires are fed into the molten steel, so that the mass fraction of Al in the molten steel is more than or equal to 0.04%.
3. The antimony-containing weathering steel is characterized by being prepared by the smelting method of the antimony-containing weathering steel as claimed in any one of claims 1 to 2, wherein the mass fraction of antimony in the antimony-containing weathering steel is 0.09-0.11%.
4. Use of the antimony-containing weathering steel of claim 3 in the manufacture of fasteners.
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| EP1979700A2 (en) * | 2005-12-21 | 2008-10-15 | ExxonMobil Research and Engineering Company | Corrosion resistant material for reduced fouling, heat transfer component with improved corrosion and fouling resistance, and method for reducing fouling |
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| CN106893798A (en) * | 2017-04-02 | 2017-06-27 | 首钢总公司 | A kind of corrosion-resisting steel adds the smelting process of antimony |
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