CN118600326B - Heat-resistant steel for metal smelting equipment and preparation method thereof - Google Patents
Heat-resistant steel for metal smelting equipment and preparation method thereof Download PDFInfo
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- CN118600326B CN118600326B CN202411092818.0A CN202411092818A CN118600326B CN 118600326 B CN118600326 B CN 118600326B CN 202411092818 A CN202411092818 A CN 202411092818A CN 118600326 B CN118600326 B CN 118600326B
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/06—Rolling hollow basic material, e.g. Assel mills
- B21B19/10—Finishing, e.g. smoothing, sizing, reeling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention relates to the technical field of metal smelting, and discloses heat-resistant steel for metal smelting equipment and a preparation method thereof, wherein the heat-resistant steel for metal smelting equipment comprises the following chemical components in percentage by mass of ：C：0.35～0.45％、Mn：1.5～2.3％、Si：≤0.15％、P：≤0.025％、S：≤0.015％、Cr：8.5～10.0％、Mo：0.4～1.0％、N：0.040～0.080％、Ni：≤0.40%、Nb：0.04～0.08％、Al：≤0.005％、Cu：≤0.25%、Ti：≤0.01％、Zr：≤0.01％, percent, the balance of Fe and unavoidable impurity elements, and the good room-temperature mechanical property, high-temperature tensile property and lasting creep property of the heat-resistant steel for metal smelting equipment are ensured by controlling the range of alloy elements such as Cr, mo, nb, N and strictly controlling the upper limit of Cu, al, ti, zr, and meanwhile, the comprehensive performance of the metal smelting equipment is improved, the service life of the heat-resistant steel is prolonged and the manufacturing cost of the heat-resistant steel is reduced by tube blank smelting, steel tube rolling and heat treatment processes.
Description
Technical Field
The invention relates to the technical field of metal smelting, and discloses heat-resistant steel for metal smelting equipment and a preparation method thereof.
Background
The metal smelting equipment has more severe requirements on the self material, and the metal magnesium belongs to a light metal structure material, has good metal performance, can be combined with various metals to produce light high-strength alloy materials, and is widely applied to aviation, aerospace, metallurgy, traffic and other departments. Along with the increase of the demand of metal magnesium, the magnesium smelting equipment also puts higher demands, in the prior art, the main production process for preparing magnesium is a silicothermic method and an electrolytic method, in the process equipment of the silicothermic method magnesium smelting technology, a reduction tank is an important equipment unit, at present, the steel for the metal magnesium smelting reduction tank is mainly made of ZG35Cr24Ni7SiN, and a reduction tank made of a centrifugal casting pipe is adopted, because the reduction tank made of the material contains a large amount of noble elements such as nickel, molybdenum and the like, the furnace burden is high in price, so that the production cost is high, due to the fact that the working condition of the reduction tank is bad, periodic production is carried out at the high temperature of 1180-1230 ℃ and the vacuum negative pressure in the tank of about 10pa for a long time, serious oxidation corrosion and strength reduction at the high temperature are easily caused, the structure performance at the high temperature is unstable, creep, deformation and crack are easy to occur to the tank body, the tank body is enabled to fail prematurely, and the service life is only 60-70 days. The reduction tank has a low service life and high price, which is a great difficulty in magnesium smelting industry, improves the comprehensive performance of the reduction tank, prolongs the service life of the reduction tank, and reduces the manufacturing cost of the reduction tank, which has become an important subject in magnesium smelting industry.
Disclosure of Invention
The invention aims to provide heat-resistant steel for metal smelting equipment and a preparation method thereof, so as to improve the comprehensive performance of the metal smelting equipment, prolong the service life of the metal smelting equipment and reduce the manufacturing cost of the metal smelting equipment.
In order to solve the technical problems, the invention provides a technical scheme of heat-resistant steel for metal smelting equipment, which comprises the following steps:
A heat-resistant steel for metal smelting equipment comprises the chemical components of ：C：0.35～ 0.45％、Mn：1.5～2.3％ 、Si：≤ 0.15％ 、P：≤ 0.025％、S：≤ 0.015％ 、Cr：8.5～10.0％ 、Mo：0.4～1.0％ 、N：0.040 ～ 0.080％、Ni：≤0.40%、Nb：0.04～0.08％、 Al：≤ 0.005％ 、Cu：≤0.25%、Ti：≤ 0.01％ 、Zr：≤ 0.01％ , mass percent of Fe and unavoidable impurity elements as the rest.
Further, the yield strength Rp0.2 is more than or equal to 700MPa, the tensile strength Rm is more than or equal to 850MPa, and the elongation A is more than or equal to 12% at room temperature of the heat-resistant steel for metal smelting equipment.
Further, when the temperature of the heat-resistant steel for metal smelting equipment is 1250 ℃, the yield strength Rp0.2 is more than or equal to 12MPa, the tensile strength Rm is more than or equal to 20MPa, and the elongation A is more than or equal to 40%.
Further, the heat-resistant steel for metal smelting equipment has a continuous strength of not less than 3000 hours at 1250 ℃ and 12 Mpa.
The invention also provides a preparation method of the heat-resistant steel for the metal smelting equipment, which comprises the following steps:
Smelting the raw materials of the heat-resistant steel for the metal smelting equipment by adopting a smelting process of an EAF electric furnace or a BOF converter, LF refining and RH vacuum treatment, precisely controlling the chemical component ranges of the raw materials, and continuously casting the raw materials into a round tube blank;
annealing the round pipe blank, and manufacturing a seamless steel pipe by adopting a pipe manufacturing method of oblique rolling perforation or hot extrusion after annealing;
and carrying out normalizing tempering heat treatment on the sized pierced billet by adopting a car bottom type LPG heat treatment furnace.
And further, after heat treatment, carrying out roughness processing on the inner surface and the outer surface of the steel pipe, wherein the roughness is 12.5-50 mu m.
Further, the round tube blank is annealed by adopting an annealing process of 870 ℃ plus or minus 10 ℃ furnace cooling.
Further, the pipe making method adopting the oblique rolling perforation or hot extrusion to manufacture the seamless steel pipe comprises the following steps:
An annular heating furnace is used for the round tube blank, and the heating temperature is controlled to be 1120-1180 ℃;
After the round tube blank is perforated by a conical roller perforating machine, a blank tube is manufactured, and the temperature of the steel tube is controlled to be 1150-1180 ℃ during perforation;
carrying out uniform wall expanding rolling on the hollow billet by using a two-roller leveling machine to obtain a hollow billet, wherein the temperature of the steel pipe is controlled to be 1020-1150 ℃ during pipe rolling;
sizing the rolled pierced billet by using a five-frame sizing mill.
Further, the normalizing and tempering heat treatment is carried out on the sized pierced billet by adopting the car bottom type LPG heat treatment furnace, and the method comprises the following steps:
carrying out normalizing and tempering heat treatment on the sized pierced billet by adopting a car bottom type LPG heat treatment furnace, wherein the normalizing heat treatment temperature is controlled to be 1020-1050 ℃, the heat preservation time is 1-1.5 minutes per 1mm wall thickness, the total heat preservation time is not less than 30 minutes, and discharging and blowing are rapidly cooled to be below 93 ℃ after the heat preservation is finished;
The tempering heat treatment temperature is controlled to 690-710 ℃, the heat preservation time is 3-4 minutes per 1mm wall thickness, the total heat preservation time is not less than 90 minutes, and the furnace is taken out for air cooling to 600 ℃ or below after the heat preservation is finished, and the furnace is straightened.
Compared with the prior art, the heat-resistant steel for the metal smelting equipment and the preparation method thereof ensure good room-temperature mechanical property, high-temperature tensile property and lasting creep property of the heat-resistant steel for the metal smelting equipment by selecting and controlling the range of steel chemical components and strictly controlling the upper limit of Cu, al, ti, zr by controlling the range of Cr, mo, nb, N and other alloy elements, reduce the content of noble metals Cr and Ni in the materials of the heat-resistant steel for the magnesium smelting reduction tank, effectively reduce the production cost of the heat-resistant steel for the magnesium smelting reduction tank, and improve the comprehensive performance of the metal smelting equipment, prolong the service life and reduce the manufacturing cost of the heat-resistant steel by tube blank smelting, steel tube rolling and heat treatment processes.
Drawings
FIG. 1 is a diagram showing a heat-resistant steel alloy for a metal smelting apparatus according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present application, numerous technical details have been set forth in order to provide a better understanding of the present application. The technical solutions claimed in the claims of the present application can be realized without these technical details and various changes and modifications based on the following embodiments.
The invention provides heat-resistant steel for metal smelting equipment, which comprises the following chemical components in percentage by mass ：C：0.35～ 0.45％、Mn：1.5～2.3％ 、Si：≤ 0.15％ 、P：≤ 0.025％、S：≤ 0.015％ 、Cr：8.5～10.0％ 、Mo：0.4～1.0％ 、N：0.040 ～ 0.080％、Ni：≤0.40%、Nb：0.04～0.08％、 Al：≤ 0.005％ 、Cu：≤0.25%、Ti：≤ 0.01％ 、Zr：≤ 0.01％ ,, and the balance of Fe and unavoidable impurity elements.
According to the heat-resistant steel for the metal smelting equipment, through controlling the composition range of the heat-resistant steel, good room-temperature mechanical property of the heat-resistant steel for the metal smelting equipment is guaranteed, meanwhile, good high-temperature tensile property and long-lasting creep property of the heat-resistant steel for the metal smelting equipment are obtained under 1250 ℃, through experimental verification, the yield strength Rp0.2 is more than or equal to 700MPa, the tensile strength Rm is more than or equal to 850MPa, the elongation A is more than or equal to 12%, the yield strength Rp0.2 is more than or equal to 12MPa, the tensile strength Rm is more than or equal to 20MPa, the elongation A is more than or equal to 40%, and the long-lasting strength of the heat-resistant steel for the metal smelting equipment is not lower than 3000 hours under 1250 ℃ and 12MPa pressure.
The selection mechanism of the content range of the heat-resistant steel chemical components for the metal smelting equipment is as follows, the precipitation strengthening effect of C, N compounds is strengthened by controlling the range of alloy elements such as Cr, mo, nb, N and the high-temperature creep capability is improved, the residual content of micro alloys such as Cu, ti, al, zr and the like is strictly controlled, the elements are easy to form compounds with C, N, the precipitation strengthening effect of Nb and C, N is affected, meanwhile, tiN compounds are formed, and the size of the TiN cannot be regulated and controlled because the melting temperature of the TiN is high, and the re-dissolution and secondary precipitation cannot be carried out by a heat treatment method. In order to avoid forming TiN precipitates, reduce the content of Ti and Zr, and ensure stronger combination tendency of Al and N and adverse effect on the action of N element in steel, the Al content is controlled, the Al content is reduced as much as possible, the martensite lath structure is higher in proportion, the high-temperature toughness and the durable creep property of the steel are ensured, and the use temperature and the efficiency requirement of a magnesium smelting reduction tank can be met.
The invention also provides a preparation method of the heat-resistant steel for the metal smelting equipment, which comprises the following steps:
smelting a tube blank by adopting a smelting process of an EAF electric furnace or a BOF converter, LF refining and RH vacuum treatment, smelting a heat-resistant steel raw material for metal smelting equipment, precisely controlling the chemical component range of the heat-resistant steel raw material, continuously casting the heat-resistant steel raw material into a round tube blank, and smelting and casting the round tube blank by adopting other suitable process flows, wherein the annealing process is 870 ℃ plus or minus 10 ℃ furnace cooling.
Rolling the steel pipe, namely manufacturing a seamless steel pipe by adopting a pipe manufacturing method of oblique rolling perforation or hot extrusion after annealing the round pipe blank;
Wherein, the round tube blank uses an annular heating furnace, the heating temperature is controlled to be 1120-1180 ℃, and the heating temperature is preferably 1160-1180 ℃.
Perforating the round tube blank by adopting a conical roller perforating machine to prepare a blank tube, wherein the temperature of the steel tube is controlled to be 1150-1180 ℃ during perforation;
performing uniform wall expanding rolling on the hollow billet by using a two-roller leveling machine, wherein the temperature of the steel pipe is controlled to be 1020-1150 ℃ during pipe rolling, and obtaining a hollow billet;
The sizing mill with five frames is used for sizing the rolled pierced billet, the contact area of the uniform rolling is large, the deformation is uniform, the spiral lines on the inner and outer surfaces caused by the diameter expansion of the oblique rolling are eliminated to the maximum extent, the uniformity of the wall thickness of the steel pipe is improved, and the steel pipe with excellent size and performance is obtained.
The heat treatment comprises the steps of carrying out normalizing and tempering heat treatment on the sized pierced billet by adopting a car bottom type LPG heat treatment furnace, controlling the temperature of the normalizing heat treatment to be 1020-1050 ℃, keeping the temperature for 1-1.5 minutes per 1mm wall thickness, keeping the total heat preservation time to be not less than 30 minutes, discharging and blowing to quickly cool to be below 93 ℃ after the heat preservation is finished, tempering, controlling the temperature of the tempering heat treatment to be 690-710 ℃, keeping the temperature for 3-4 minutes per 1mm wall thickness, keeping the total heat preservation time to be not less than 90 minutes, discharging and air cooling to be below 600 ℃ after the heat preservation is finished, and straightening with temperature.
Preferably, in order to improve the laser cladding performance of the steel pipe, the roughness processing is carried out on the inner surface and the outer surface of the steel pipe after heat treatment, and the grinding wheel is used for grinding the surface of the steel pipe, so that the roughness is 12.5-50 mu m, and the bonding strength of a cladding layer is improved.
In an exemplary embodiment, a round tube blank is formed through continuous casting by a smelting process of an EAF electric furnace, LF refining and RH vacuum treatment, and the steel is subjected to uniform chemical composition and grain structure and purity of the steel in the continuous casting process of the EAF electric furnace, LF refining and RH vacuum treatment, so that the performance of the steel tube is ensured, and the prepared tube blanks with the serial numbers of 1 to 3 are obtained by sampling and numbering. The chemical composition measurements of the tube blanks of Nos. 1 to 3 excluding Fe and unavoidable impurity elements are shown in Table 1:
TABLE 1 No. 1-3 chemical composition test record Table for tube blank (unit: wt%)
| Sequence number | C | Mn | Si | P | S | Cr | Mo | N | Ni | Nb | Al | Cu | Ti | Zr |
| 1 | 0.42 | 1.83 | 0.05 | 0.012 | 0.002 | 8.88 | 0.48 | 0.050 | 0.05 | 0.05 | 0.005 | 0.02 | 0.001 | 0.010 |
| 2 | 0.38 | 2.23 | 0.09 | 0.011 | 0.002 | 9.50 | 0.43 | 0.060 | 0.05 | 0.05 | 0.002 | 0.02 | 0.001 | 0.003 |
| 3 | 0.40 | 1.50 | 0.15 | 0.012 | 0.003 | 10.0 0 | 1.00 | 0.080 | 0.35 | 0.08 | 0.005 | 0.20 | 0.001 | 0.003 |
The chemical components of the tube blanks with the serial numbers of 1-3 are all in the range selected by the heat-resistant steel chemical components for the metal smelting equipment.
And rolling and heat treating the tube blank with the sequence numbers of 1-3, and controlling various technological parameters such as heating temperature, perforating temperature, average finishing rolling temperature, sizing and the like of the tube blank in the process of rolling the steel tube so as to meet the index requirements of technological dimensions and performances of the steel tube. The round tube blank is perforated by a conical roller perforating machine to prepare a blank tube, wherein the temperature of the steel tube is controlled to be 1150-1180 ℃ during perforation;
The sizing mill with five frames is used for sizing the rolled pierced billet, the contact area of the uniform rolling is large, the deformation is uniform, the spiral lines on the inner and outer surfaces caused by the diameter expansion of the oblique rolling are eliminated to the maximum extent, the uniformity of the wall thickness of the steel pipe is improved, and the steel pipe with excellent size and performance is obtained.
The method comprises the steps of carrying out normalizing and tempering heat treatment on a sized pierced billet by adopting a car bottom type LPG heat treatment furnace, controlling the normalizing heat treatment temperature to be 1020-1050 ℃, keeping the temperature for 1-1.5 minutes per 1mm wall thickness, taking out from the furnace after the heat preservation is finished, rapidly cooling to 93 ℃ below, tempering again, controlling the tempering heat treatment temperature to be 690-710 ℃, keeping the temperature for 3-4 minutes per 1mm wall thickness, keeping the total heat preservation time to be not less than 90 minutes, taking out from the furnace, cooling to 600 ℃ below by air after the heat preservation is finished, and straightening with temperature.
The heat-resistant steel for metal smelting equipment was produced by rolling and heat-treating the tube blanks of the numbers 1 to 3, and performance test was conducted thereon, and the test results are shown in table 2.
Table 2 table number 1-3 heat-resistant steel performance test record table for metal smelting equipment
| Sequence number | Temperature (temperature) | Yield strength Mpa | Tensile strength Mpa | Elongation percentage% | High temperature | Yield strength Mpa | Tensile strength Mpa | Elongation percentage% |
| 1 | Room temperature | 775 | 950 | 15 | 1250°C | 14 | 20 | 42 |
| 2 | Room temperature | 790 | 995 | 16 | 1250°C | 16 | 24 | 45 |
| 3 | Room temperature | 815 | 1025 | 13 | 1250°C | 14 | 21 | 42 |
As can be seen from tables 1 and 2, the heat-resistant steel seamless steel tube for metal alloy equipment provided by the invention has the advantages of uniform chemical components, stable performance and better comprehensive performance, under the condition of room temperature, the yield strength Rp0.2 of the heat-resistant steel for metal smelting equipment is more than or equal to 700MPa, the tensile strength Rm is more than or equal to 850MPa, the elongation A is more than or equal to 12%, under the condition of 1250 ℃, the yield strength Rp0.2 is more than or equal to 12MPa, the tensile strength Rm is more than or equal to 20MPa, the elongation A is more than or equal to 40%, and the test sample with the number 2 is selected for 1250 ℃ and 12MPa continuous strength test, and the duration is longer than 3000 hours. By adopting the preparation method of the heat-resistant steel for the metal smelting equipment and controlling the chemical components of the heat-resistant steel for the metal smelting equipment, the upper limit of the use temperature of the ferrite heat-resistant steel reaches 1250 ℃, and the equipment requirements of the metal smelting equipment, such as a metal smelting reduction tank and related pipelines, can be met, and particularly compared with the material of a magnesium smelting reduction tank in the prior art, the heat-resistant steel for the metal smelting equipment has more excellent high-temperature performance, prolongs the service life, reduces the use of noble metals Cr and Ni, and reduces the manufacturing cost of the magnesium smelting reduction tank.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A heat-resistant steel for metal smelting equipment is characterized in that the heat-resistant steel for metal smelting equipment comprises the following chemical components in percentage by mass, the balance of ：C：0.35~ 0.45％、Mn：1.5~2.3％ 、Si：≤ 0.15％ 、P：≤ 0.025％、S：≤ 0.015％ 、Cr：8.5~10.0％ 、Mo：0.4~1.0％ 、N：0.040 ～ 0.080％、Ni：≤0.40%、Nb：0.04~0.08％、 Al：≤ 0.005％ 、Cu：≤0.25%、Ti：≤ 0.01％ 、Zr：≤ 0.01％ , of Fe and unavoidable impurity elements, the yield strength Rp0.2 is more than or equal to 12MPa, the tensile strength Rm is more than or equal to 20MPa and the elongation A is more than or equal to 40%, the yield strength Rp0.2 is more than or equal to 700MPa, the tensile strength Rm is more than or equal to 850MPa and the elongation A is more than or equal to 12% at the room temperature.
2. The heat-resistant steel for metal smelting equipment according to claim 1, wherein the heat-resistant steel for metal smelting equipment has a continuous strength of not less than 3000 hours at 1250 ℃ and 12 Mpa.
3. The preparation method of the heat-resistant steel for the metal smelting equipment is characterized by comprising the following steps of:
smelting the raw materials of the heat-resistant steel for the metal smelting equipment according to any one of claims 1-2 by adopting a smelting process of an EAF electric furnace or a BOF converter, LF refining and RH vacuum treatment, precisely controlling the chemical component ranges of the raw materials, and continuously casting the raw materials into a round tube blank;
annealing the round pipe blank, and manufacturing a seamless steel pipe by adopting a pipe manufacturing method of oblique rolling perforation or hot extrusion after annealing;
and carrying out normalizing tempering heat treatment on the sized pierced billet by adopting a car bottom type LPG heat treatment furnace.
4. The method for producing heat-resistant steel for metal-smelting facilities according to claim 3, wherein the steel pipe is subjected to internal and external surface roughness processing after heat treatment, and the roughness is 12.5 to 50. Mu.m.
5. The method for producing heat-resistant steel for metal-smelting apparatus according to claim 3, wherein the round tube blank is annealed by a furnace cooling process of 870 ℃ plus or minus 10 ℃.
6. The method for producing a heat-resistant steel for a metal-smelting apparatus according to claim 3, wherein the annealing treatment of the round pipe blank, after annealing, produces a seamless steel pipe by a pipe-making method by piercing with a skew rolling, comprising:
Before the round tube blank is annealed, an annular heating furnace is used for the round tube blank until the temperature is 1120-1180 ℃;
after the round tube blank is annealed, a conical roller perforating machine is used for perforating the round tube blank at 1150-1180 ℃ to prepare a blank tube;
performing uniform wall expanding rolling on the hollow billet at 1020-1150 ℃ by using a two-roller leveling machine to obtain a hollow billet;
sizing the rolled pierced billet by using a five-frame sizing mill.
7. The method for producing heat-resistant steel for metal-smelting equipment according to claim 3, wherein normalizing tempering heat treatment is performed on the sized pierced billet by using a car bottom type LPG heat treatment furnace, comprising:
carrying out normalizing and tempering heat treatment on the sized pierced billet by adopting a car bottom type LPG heat treatment furnace, wherein the normalizing heat treatment temperature is controlled to be 1020-1050 ℃, the heat preservation time is 1-1.5 minutes per 1mm wall thickness, the total heat preservation time is not less than 30 minutes, and discharging and blowing are rapidly cooled to be below 93 ℃ after the heat preservation is finished;
The tempering heat treatment temperature is controlled to 690-710 ℃, the heat preservation time is 3-4 minutes per 1mm wall thickness, the total heat preservation time is not less than 90 minutes, and the furnace is taken out for air cooling to 600 ℃ or below after the heat preservation is finished, and the furnace is straightened.
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| CN102758141A (en) * | 2011-04-25 | 2012-10-31 | 中国科学院金属研究所 | Novel nitride-reinforced martensite heat-resisting steel |
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| CN102758141A (en) * | 2011-04-25 | 2012-10-31 | 中国科学院金属研究所 | Novel nitride-reinforced martensite heat-resisting steel |
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