CN114855074A - High-temperature-resistant alloy steel and preparation method thereof - Google Patents
High-temperature-resistant alloy steel and preparation method thereof Download PDFInfo
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- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000005242 forging Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 230000032683 aging Effects 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 11
- 229910001068 laves phase Inorganic materials 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 11
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 11
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 11
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 6
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 6
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 6
- 229910052745 lead Inorganic materials 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 229910052718 tin Inorganic materials 0.000 claims abstract description 6
- 230000001808 coupling effect Effects 0.000 claims abstract description 5
- 239000006104 solid solution Substances 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 25
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 8
- 238000005204 segregation Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 4
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000001307 helium Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 claims description 4
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000000265 homogenisation Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 101000912561 Bos taurus Fibrinogen gamma-B chain Proteins 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 1
- 229910000601 superalloy Inorganic materials 0.000 description 5
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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
-
- 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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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/20—Arc remelting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
The invention discloses high-temperature-resistant alloy steel which is prepared from the following raw materials in percentage by mass: c: 0.2 to 0.25%, Si: 0.2-0.3%, Mn: 3.2-3.5%, Cr: 2-3%, Ni: 0.1 to 0.5%, Nb: 1-1.5%, Ti: 1-1.8%, Mg: 2-2.8%, Re: 0.05-0.08%, V: 0.1-0.4%, W: 0.2-0.3%, Co: 1.2 to 1.5 percent of P, less than or equal to 0.008 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.0008 percent of As, less than or equal to 0.0008 percent of Sb, less than or equal to 0.00003 percent of Bi, less than or equal to 0.0005 percent of Sn, less than or equal to 0.0008 percent of Pb, less than or equal to 12PPM of O, 0.2 to 0.28 percent of N and the balance of Fe; the preparation method comprises the following steps: composition design → electric furnace smelting → vacuum carbon deoxidation → LF refining → VD vacuum → casting → steel ingot heating → forging → heat treatment after forging → flaw detection. The coupling effect of large-deformation multidirectional pier pulling and temperature gradient drop of each step is integrated, and precipitated phases and grain sizes are controlled; solid solution treatment and graded aging treatment are adopted to optimize the precipitation behavior of a gamma 'phase and a gamma' phase; the microstructure of the obtained forged piece has no Laves phase, and the grain size is 7 grade; the performance is excellent at room temperature and 650 ℃.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy manufacturing, in particular to high-temperature-resistant alloy steel and a preparation method thereof.
Background
The high-temperature alloy is widely applied to core hot end parts of aviation and aerospace engines, ships and industrial gas turbines due to the outstanding performance of the high-temperature alloy in a high-temperature working environment, and the consumption of the high-temperature alloy in modern aviation engines accounts for 40-60% of the quality of the engines, so that the high-temperature alloy is known as 'base stone of advanced engines'. For various superalloys used in aircraft engines, the forged superalloy comprises about 75% of the total weight of the superalloy blank, the cast superalloy about 20%, and the powdered superalloy about 5%.
Military engines are generally rated at their state of the art in a thrust-to-weight ratio, with increasing turbine front temperature being the most direct way to increase the thrust-to-weight ratio. From the first generation aircraft engines to the fifth generation engines at present, the pre-turbine temperature has been raised from the initial 1200-1300K to 1850-2000K. With the gradual increase of the temperature in front of the turbine, the dependence on the high-temperature alloy is larger and larger, and the performance requirements are more and more strict. High temperature alloys have become a key factor in determining the technological development of aircraft engines.
In order to meet the requirements of ultra high speed, large lift limit, long endurance and long range of the advanced aero-engine, the temperature design index of the engine combustion chamber is further increased, and the existing high-temperature alloy parts cannot fully meet the performance requirements of the advanced aero-engine.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided is a high temperature resistant alloy steel.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the high-temperature-resistant alloy steel is characterized by being prepared from the following raw materials in percentage by mass: 0.2 to 0.25%, Si: 0.2-0.3%, Mn: 3.2 to 3.5%, Cr: 2-3%, Ni: 0.1 to 0.5%, Nb: 1-1.5%, Ti: 1-1.8%, Mg: 2-2.8%, Re: 0.05-0.08%, V: 0.1-0.4%, W: 0.2-0.3%, Co: 1.2 to 1.5 percent of P, less than or equal to 0.008 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.0008 percent of As, less than or equal to 0.0008 percent of Sb, less than or equal to 0.00003 percent of Bi, less than or equal to 0.0005 percent of Sn, less than or equal to 0.0008 percent of Pb, less than or equal to 12PPM of O, 0.2 to 0.28 percent of N and the balance of Fe;
the high-temperature resistant alloy steel has a microstructure without Laves phase and a grain size of 7 grades; room temperature tensile properties: rm is more than or equal to 1300MPa, Rp0.2 is more than or equal to 1080MPa, A is more than or equal to 15 percent, Z is more than or equal to 25 percent, and Kv is more than or equal to 38J; tensile properties at 650 ℃: rm is more than or equal to 1080MPa, Rp0.2 is more than or equal to 900MPa, A is more than or equal to 16 percent, and Z is more than or equal to 30 percent.
Preferably, the high-temperature-resistant alloy steel is characterized in that: the high-temperature resistant alloy steel is prepared from the following raw materials in percentage by mass: 0.23 to 0.25%, Si: 0.2 to 0.25%, Mn: 3.2 to 3.4%, Cr: 2.4-2.8%, Ni: 0.3 to 0.4%, Nb: 1.2-1.4%, Ti: 1.3-1.6%, Mg: 2.3-2.5%, Re: 0.06-0.08%, V: 0.3-0.4%, W: 0.22-0.3%, Co: 1.4-1.5%, P is less than or equal to 0.006%, S is less than or equal to 0.0012%, As is less than or equal to 0.0006%, Sb is less than or equal to 0.0006%, Bi is less than or equal to 0.00002%, Sn is less than or equal to 0.0004%, Pb is less than or equal to 0.0006%, O is less than or equal to 10PPM, N is 0.2-0.23%, and the balance is Fe.
Further preferably, the high-temperature-resistant alloy steel is characterized in that: the high-temperature-resistant alloy steel is prepared from the following raw materials in percentage by mass: 0.23%, Si: 0.2%, Mn: 3.2%, Cr: 2.4%, Ni: 0.3%, Nb: 1.2%, Ti: 1.3%, Mg: 2.3%, Re: 0.06%, V: 0.3%, W: 0.22%, Co: 1.4 percent of P is less than or equal to 0.006 percent, S is less than or equal to 0.0012 percent, As is less than or equal to 0.0006 percent, Sb is less than or equal to 0.0006 percent, Bi is less than or equal to 0.00002 percent, Sn is less than or equal to 0.0004 percent, Pb is less than or equal to 0.0006 percent, O is less than or equal to 10PPM, N is 0.2 percent, and the balance is Fe.
Further preferably, the high-temperature-resistant alloy steel is characterized in that: the high-temperature-resistant alloy steel is prepared from the following raw materials in percentage by mass: 0.25%, Si: 0.25%, Mn: 3.4%, Cr: 2.8%, Ni: 0.4%, Nb: 1.4%, Ti: 1.6%, Mg: 2.5%, Re: 0.08%, V: 0.4%, W: 0.3%, Co: 1.5 percent of P is less than or equal to 0.006 percent, S is less than or equal to 0.0012 percent, As is less than or equal to 0.0006 percent, Sb is less than or equal to 0.0006 percent, Bi is less than or equal to 0.00002 percent, Sn is less than or equal to 0.0004 percent, Pb is less than or equal to 0.0006 percent, O is less than or equal to 10PPM, N is 0.23 percent, and the balance is Fe.
The preparation method of the high-temperature-resistant alloy steel is also protected, and comprises the following steps: the method comprises the following steps: composition design → electric furnace smelting → vacuum carbon deoxidation → LF refining → VD vacuum → pouring → steel ingot heating → forging → heat treatment after forging → flaw detection.
The electric furnace is used for smelting CaF 2 /Al 2 O 3 /CaO/MgO/TiO 2 Preparing slag for electroslag remelting, carrying out electroslag remelting at a constant melting speed under the protection of argon, and finally adopting a low-segregation vacuum consumable electrode smelting process based on molten drop control helium cooling and shallow flat molten pool control technology to strictly control the content of impurity elements and inhibit element burning loss and segregation so as to obtain a high-purity high-temperature alloy ingot.
The heat treatment after forging is performed by adopting two-stage type long-time sub-temperature homogenizing annealing at 1155 +/-5 ℃ and 1200 +/-10 ℃, and the heat preservation is performed for 24 hours at 1155 +/-5 ℃ and 96 hours at 1200 +/-10 ℃; the brittle laves phase in the steel ingot is eliminated, and the formation of eutectic phase with low melting point is avoided; cooling along with the furnace after the homogenization annealing, reducing the rheological stress of the steel ingot and improving the hot processing performance.
The forging is carried out by integrating the coupling effects of large-deformation multidirectional pier pulling and temperature gradient reduction of each step, and controlling precipitated phases and grain sizes.
The post-forging heat treatment further comprises the steps of post-forging solid solution and graded aging treatment: in the process of the solution treatment, the temperature is kept at 600 ℃ for 1h, and the temperature is kept at 970 +/-8 ℃ for 1.5 h; trace delta phase is separated out in the process of solution treatment, so that high-temperature durable notch sensitivity can be eliminated; in the grading aging treatment process, two times of aging treatment are carried out in sequence at 720 +/-5 ℃ and 620 +/-5 ℃, the temperature is kept at 720 +/-5 ℃ for 8 hours, and the temperature is kept at 620 +/-5 ℃ for 8 hours; so that the particles of the gamma 'phase and the gamma' phase are dispersed and separated out; the microstructure of the obtained forged piece has no Laves phase, the grain size is 7 grade, and the grade difference is less than 1; excellent tensile impact performance at room temperature and 650 ℃.
The invention has the technical effects that: firstly, a multi-connection smelting process is comprehensively adopted, and the intermediate alloy is pre-smelted by vacuum induction and then subjected to CaF 2 /Al 2 O 3 /CaO/MgO/TiO 2 Slag and argon are protected to perform electroslag remelting at a constant melting speed, and finally a low-segregation vacuum consumable electrode smelting process based on molten drop control helium cooling and shallow flat molten pool control technology is adopted to strictly control the content of impurity elements and inhibit element burning loss and segregation so as to obtain a high-purity high-temperature alloy ingot.
Adopting 1155 ℃ and 1200 ℃ two-stage type long-time sub-temperature homogenization annealing to eliminate brittle laves phases in the steel ingot and avoid the formation of eutectic phases with low melting points; cooling along with the furnace after the homogenizing annealing, reducing the flow stress of the steel ingot and improving the hot processing performance.
Combining the coupling effects of large-deformation multidirectional pier pulling and temperature gradient drop of each step, and controlling precipitated phases and grain sizes; solid solution treatment and graded aging treatment are adopted to optimize the precipitation behavior of a gamma 'phase and a gamma' phase; the microstructure of the obtained forge piece has no Laves phase, and the grain size is 7 grade; the performance is excellent at room temperature and 650 ℃.
Drawings
FIG. 1 is a sectional sub-temperature homogenizing annealing heat treatment process diagram;
FIG. 2 is a diagram of a post-forging solution-aging heat treatment process;
FIG. 3 is an electron micrograph of a high temperature resistant alloy steel.
Detailed Description
The technical solution of the present invention is further described below with reference to the following examples:
example 1
The high-temperature-resistant alloy steel is characterized in that: the high-temperature resistant alloy steel is prepared from the following raw materials in percentage by mass: 0.23%, Si: 0.2%, Mn: 3.2%, Cr: 2.4%, Ni: 0.3%, Nb: 1.2%, Ti: 1.3%, Mg: 2.3%, Re: 0.06%, V: 0.3%, W: 0.22%, Co: 1.4 percent of P is less than or equal to 0.006 percent, S is less than or equal to 0.0012 percent, As is less than or equal to 0.0006 percent, Sb is less than or equal to 0.0006 percent, Bi is less than or equal to 0.00002 percent, Sn is less than or equal to 0.0004 percent, Pb is less than or equal to 0.0006 percent, O is less than or equal to 10PPM, N is 0.2 percent, and the balance is Fe.
The high-temperature resistant alloy steel has a microstructure without Laves phase and a grain size of 7 grades; room temperature tensile properties: rm is more than or equal to 1300MPa, Rp0.2 is more than or equal to 1080MPa, A is more than or equal to 15 percent, Z is more than or equal to 25 percent, and Kv is more than or equal to 38J; tensile properties at 650 ℃: rm is more than or equal to 1080MPa, Rp0.2 is more than or equal to 900MPa, A is more than or equal to 16 percent, and Z is more than or equal to 30 percent.
The preparation method of the high-temperature-resistant alloy steel is also protected, and comprises the following steps: the method comprises the following steps: composition design → electric furnace smelting → vacuum carbon deoxidation → LF refining → VD vacuum → pouring → steel ingot heating → forging → heat treatment after forging → flaw detection.
The electric furnace is used for smelting CaF 2 /Al 2 O 3 /CaO/MgO/TiO 2 Preparing slag for electroslag remelting, carrying out electroslag remelting at a constant melting speed under the protection of argon, and finally adopting a low-segregation vacuum consumable electrode smelting process based on molten drop control helium cooling and shallow flat molten pool control technology to strictly control the content of impurity elements and inhibit element burning loss and segregation so as to obtain a high-purity high-temperature alloy ingot.
The heat treatment after forging is performed by adopting two-stage type long-time sub-temperature homogenizing annealing at 1155 +/-5 ℃ and 1200 +/-10 ℃, and the heat preservation is performed for 24 hours at 1155 +/-5 ℃ and 96 hours at 1200 +/-10 ℃; the brittle laves phase in the steel ingot is eliminated, and the formation of eutectic phase with low melting point is avoided; cooling along with the furnace after the homogenizing annealing, reducing the rheological stress of the steel ingot and improving the hot-working performance.
The forging is carried out by integrating the coupling effects of large-deformation multidirectional pier pulling and temperature gradient drop in each step and controlling precipitated phases and grain sizes.
The post-forging heat treatment further comprises post-forging solid solution and graded aging treatment: in the process of the solution treatment, the temperature is kept at 600 ℃ for 1h, and the temperature is kept at 970 +/-8 ℃ for 1.5 h; trace delta phase is separated out in the process of solution treatment, so that high-temperature durable notch sensitivity can be eliminated; in the grading aging treatment process, two times of aging treatment are carried out in sequence at 720 +/-5 ℃ and 620 +/-5 ℃, the temperature is kept at 720 +/-5 ℃ for 8 hours, and the temperature is kept at 620 +/-5 ℃ for 8 hours; so that the particles of the gamma 'phase and the gamma' phase are dispersed and separated out; the microstructure of the obtained forged piece has no Laves phase, the grain size is 7 grade, and the grade difference is less than 1; excellent tensile impact performance at room temperature and 650 ℃.
Example 2
The high-temperature-resistant alloy steel is characterized in that: the high-temperature resistant alloy steel is prepared from the following raw materials in percentage by mass: 0.25%, Si: 0.25%, Mn: 3.4%, Cr: 2.8%, Ni: 0.4%, Nb: 1.4%, Ti: 1.6%, Mg: 2.5%, Re: 0.08%, V: 0.4%, W: 0.3%, Co: 1.5 percent of P is less than or equal to 0.006 percent, S is less than or equal to 0.0012 percent, As is less than or equal to 0.0006 percent, Sb is less than or equal to 0.0006 percent, Bi is less than or equal to 0.00002 percent, Sn is less than or equal to 0.0004 percent, Pb is less than or equal to 0.0006 percent, O is less than or equal to 10PPM, N is 0.23 percent, and the balance is Fe.
The high-temperature resistant alloy steel has a microstructure without Laves phase and a grain size of 7 grades; room temperature tensile properties: rm is more than or equal to 1300MPa, Rp0.2 is more than or equal to 1080MPa, A is more than or equal to 15 percent, Z is more than or equal to 25 percent, and Kv is more than or equal to 38J; tensile properties at 650 ℃: rm is more than or equal to 1080MPa, Rp0.2 is more than or equal to 900MPa, A is more than or equal to 16 percent, and Z is more than or equal to 30 percent.
The preparation method is the same as that of example 1.
Claims (9)
1. The high-temperature-resistant alloy steel is characterized by being prepared from the following raw materials in percentage by mass: 0.2 to 0.25%, Si: 0.2-0.3%, Mn: 3.2-3.5%, Cr: 2-3%, Ni: 0.1 to 0.5%, Nb: 1-1.5%, Ti: 1-1.8%, Mg: 2-2.8%, Re: 0.05-0.08%, V: 0.1-0.4%, W: 0.2-0.3%, Co: 1.2 to 1.5 percent of P, less than or equal to 0.008 percent of P, less than or equal to 0.0015 percent of S, less than or equal to 0.0008 percent of As, less than or equal to 0.0008 percent of Sb, less than or equal to 0.00003 percent of Bi, less than or equal to 0.0005 percent of Sn, less than or equal to 0.0008 percent of Pb, less than or equal to 12PPM of O, 0.2 to 0.28 percent of N and the balance of Fe;
the high-temperature resistant alloy steel has a microstructure without Laves phase and a grain size of 7 grades; room temperature tensile properties: rm is more than or equal to 1300MPa, Rp0.2 is more than or equal to 1080MPa, A is more than or equal to 15 percent, Z is more than or equal to 25 percent, and Kv is more than or equal to 38J; tensile properties at 650 ℃: rm is more than or equal to 1080MPa, Rp0.2 is more than or equal to 900MPa, A is more than or equal to 16 percent, and Z is more than or equal to 30 percent.
2. The high temperature resistant alloy steel according to claim 1, wherein: the high-temperature resistant alloy steel is prepared from the following raw materials in percentage by mass: c: 0.23 to 0.25%, Si: 0.2 to 0.25%, Mn: 3.2-3.4%, Cr: 2.4-2.8%, Ni: 0.3 to 0.4%, Nb: 1.2-1.4%, Ti: 1.3-1.6%, Mg: 2.3-2.5%, Re: 0.06-0.08%, V: 0.3-0.4%, W: 0.22-0.3%, Co: 1.4-1.5%, P is less than or equal to 0.006%, S is less than or equal to 0.0012%, As is less than or equal to 0.0006%, Sb is less than or equal to 0.0006%, Bi is less than or equal to 0.00002%, Sn is less than or equal to 0.0004%, Pb is less than or equal to 0.0006%, O is less than or equal to 10PPM, N is 0.2-0.23%, and the balance is Fe.
3. A high temperature resistant steel alloy according to claim 1 or 2, characterized in that: the high-temperature resistant alloy steel is prepared from the following raw materials in percentage by mass: c: 0.23%, Si: 0.2%, Mn: 3.2%, Cr: 2.4%, Ni: 0.3%, Nb: 1.2%, Ti: 1.3%, Mg: 2.3%, Re: 0.06%, V: 0.3%, W: 0.22%, Co: 1.4 percent of the total weight of the alloy, less than or equal to 0.006 percent of P, less than or equal to 0.0012 percent of S, less than or equal to 0.0006 percent of As, less than or equal to 0.0006 percent of Sb, less than or equal to 0.00002 percent of Bi, less than or equal to 0.0004 percent of Sn, less than or equal to 0.0006 percent of Pb, less than or equal to 10PPM of O, 0.2 percent of N and the balance of Fe.
4. A high temperature resistant steel alloy according to claim 1 or 2, characterized in that: the high-temperature resistant alloy steel is prepared from the following raw materials in percentage by mass: c: 0.25%, Si: 0.25%, Mn: 3.4%, Cr: 2.8%, Ni: 0.4%, Nb: 1.4%, Ti: 1.6%, Mg: 2.5%, Re: 0.08%, V: 0.4%, W: 0.3%, Co: 1.5 percent of P is less than or equal to 0.006 percent, S is less than or equal to 0.0012 percent, As is less than or equal to 0.0006 percent, Sb is less than or equal to 0.0006 percent, Bi is less than or equal to 0.00002 percent, Sn is less than or equal to 0.0004 percent, Pb is less than or equal to 0.0006 percent, O is less than or equal to 10PPM, N is 0.23 percent, and the balance is Fe.
5. The preparation method of the high-temperature-resistant alloy steel as claimed in any one of claims 1 to 4, comprising the following steps of: the method comprises the following steps: composition design → electric furnace smelting → vacuum carbon deoxidation → LF refining → VD vacuum → pouring → steel ingot heating → forging → heat treatment after forging → flaw detection.
6. The method for preparing high-temperature-resistant alloy steel according to claim 5, wherein the method comprises the following steps: the electric furnace is used for smelting CaF 2 /Al 2 O 3 /CaO/MgO/TiO 2 Preparing slag for electroslag remelting, carrying out electroslag remelting at a constant melting speed under the protection of argon, and finally adopting a low-segregation vacuum consumable electrode smelting process based on molten drop control helium cooling and shallow flat molten pool control technology to strictly control the content of impurity elements and inhibit element burning loss and segregation so as to obtain a high-purity high-temperature alloy ingot.
7. The method for preparing high-temperature-resistant alloy steel according to claim 5, wherein the method comprises the following steps: the heat treatment after forging adopts two-section type long-time sub-temperature homogenization annealing at 1155 +/-5 ℃ and 1200 +/-10 ℃, and the heat preservation is carried out at 1155 +/-5 ℃ for 24 hours and at 1200 +/-10 ℃ for 96 hours.
8. The method for preparing high temperature resistant alloy steel according to claim 5, characterized in that: the forging is carried out by integrating the coupling effects of large-deformation multidirectional pier pulling and temperature gradient reduction of each step, and controlling precipitated phases and grain sizes.
9. The method for preparing high-temperature-resistant alloy steel according to claim 5, wherein the method comprises the following steps: the post-forging heat treatment further comprises post-forging solid solution and graded aging treatment: in the process of the solution treatment, the temperature is kept at 600 ℃ for 1h, and the temperature is kept at 970 +/-8 ℃ for 1.5 h; in the process of the graded aging treatment, the aging treatment is carried out twice at 720 plus or minus 5 ℃ and 620 plus or minus 5 ℃ in sequence, the temperature is kept at 720 plus or minus 5 ℃ for 8 hours, and the temperature is kept at 620 plus or minus 5 ℃ for 8 hours.
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| JPH08193240A (en) * | 1994-11-18 | 1996-07-30 | Nippon Steel Corp | Steel material excellent in temper embrittlement resistance and its production |
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| JPH08193240A (en) * | 1994-11-18 | 1996-07-30 | Nippon Steel Corp | Steel material excellent in temper embrittlement resistance and its production |
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