CN108866453A - A kind of martensite heat-resistant steel and preparation method thereof - Google Patents
A kind of martensite heat-resistant steel and preparation method thereof Download PDFInfo
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- CN108866453A CN108866453A CN201810794256.2A CN201810794256A CN108866453A CN 108866453 A CN108866453 A CN 108866453A CN 201810794256 A CN201810794256 A CN 201810794256A CN 108866453 A CN108866453 A CN 108866453A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 65
- 239000010959 steel Substances 0.000 title claims abstract description 65
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000005496 tempering Methods 0.000 claims abstract description 30
- 239000002244 precipitate Substances 0.000 claims abstract description 7
- 238000005242 forging Methods 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- 239000006104 solid solution Substances 0.000 claims description 7
- 229910001566 austenite Inorganic materials 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 239000000956 alloy Substances 0.000 claims 1
- 238000005275 alloying Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 10
- 238000013461 design Methods 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229910052758 niobium Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000004627 transmission electron microscopy Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- C22C38/18—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
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
-
- 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
-
- 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
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/18—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
-
- 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
- C22C38/18—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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a kind of martensite heat-resistant steel and preparation method thereof, each element mass percent contained is：C：0.1~0.2%；Cr：9~14%；Ni：2.5~3.5%；Mo：1.0~2.0%；W：0.5~1.0%；Mn：0.5~1.0%；Si：0.10~0.5%；V：0.10~0.5%；Nb：0.1~0.5%；N：0.02~0.05%；Surplus is Fe；The carboritride being wherein precipitated is in Dispersed precipitate state, and the carboritride includes M2X type, M7C3 type, MX type and M6C type carbide.The Alloying Design of martensite heat-resistant steel is accurately controlled with tempering process and is combined by the present invention, by adjusting the content and type of alloying element, it is tempered using lower temperature, it is remarkably improved the high temperature toughness and tenacity of martensite heat-resistant steel, higher-strength and hardness are kept while obtaining high tenacity, avoids temper brittleness.
Description
Technical field
The invention belongs to technical field of heat-resistant steel, it is related to a kind of martensite heat-resistant steel and preparation method thereof.
Background technique
Martensite heat-resistant steel creep strength usually with higher, corrosion resistance, higher heat resistance and thermal conductivity, it is lower
Thermal expansion coefficient is widely used in hot operation component, such as turbine blade, valve, steam boiler, exhaust valve for internal combustion engine, boat
The equipment such as empty space flight and petrochemical industry.These components long services bear various load and (stretch, bending, turn round in hot environment
Turn, impact, fatigue etc.) act on, while with high-temperature steam, air or contacts fuel gas, working environment is very harsh.With combustion gas wheel
The development of machine and other high-temperature and high-pressure techniques, the performance to high temperature resistant component of machine is it is also proposed that increasingly higher demands.Due to
In the high temperature environment, alloying element occurs to spread and cause structural transformation in steel, generates unfavorable shadow to the performance of high temperature components
It rings.
For the high temperature obdurability for improving martensite heat-resistant steel, Alloying Treatment usually is carried out to martensite heat-resistant steel.Pass through
The alloying elements such as Cr, Ni, Mn, Si, Mo are added, generate the reinforcing item of infusibility, and by tempering process, promote to strengthen item disperse analysis
Out, tiny carbonitride or intermetallic compound are precipitated on martensitic matrix, such as MX, M2X, M7C3, M23C6 and
The types such as M6C (M is metallic element, and X is nonmetalloid C, N etc.), to further increase the high temperature toughness and tenacity of heat resisting steel.Add
The type and content of additional element is different, can significantly affect the performance of martensite heat-resistant steel, such as causes brittleness, processing difficulties,
Cost increase etc..Tempering process is different, can also significantly affect the mechanical property of martensite heat-resistant steel.Lonneal causes material tough
Property it is insufficient, easily cause temper brittleness；And tempering temperature is high, energy consumption increases, and the process time extends, and also results in the strength of materials
It is insufficient, it is also possible to cause temper brittleness.
Summary of the invention
Present invention solves the problem in that a kind of martensite heat-resistant steel and preparation method thereof is provided, by martensite heat-resistant steel
Alloying is combined with tempering process, is maintained higher intensity and hardness while obtaining high tenacity, is avoided temper brittleness.
The present invention is to be achieved through the following technical solutions：
A kind of martensite heat-resistant steel, each element mass percent contained are：
C：0.1~0.2%；Cr：9~14%；Ni：2.5~3.5%；Mo：1.0~2.0%；W：0.5~1.0%；Mn：
0.5~1.0%；Si：0.10~0.5%；V：0.10~0.5%；Nb：0.1~0.5%；N：0.02~0.05%；Surplus is
Fe；
The carboritride being wherein precipitated be in Dispersed precipitate state, the carboritride include M2X type, M7C3 type,
MX type and M6C type carbide.
Further, also contain B：0.10~0.5%, Co：0.10~0.5% element.
MX, M7C3 the type carbonitride being precipitated, are uniformly distributed in martensite lath.
, when carrying out tempering, tempering temperature is 560~610 DEG C for it, keeps the temperature 1.5~4 hours.
A kind of preparation method of martensite heat-resistant steel, including following operation：
1) the element ratio melting of following mass percent is become into steel ingot：
C：0.1~0.2%；Cr：9~14%；Ni：2.5~3.5%；Mo：1.0~2.0%；W：0.5~1.0%；Mn：
0.5~1.0%；Si：0.10~0.5%；V：0.10~0.5%；Nb：0.1~0.5%；N：0.02~0.05%；Surplus is
Fe；
2) by the steel ingot of melting in 1150 DEG C~1050 DEG C progress higher temperature solid solutions, and 10~30 minutes are kept the temperature, makes to close
Gold element is dissolved completely in austenite；High temperature forging is carried out later, and forging temperature is 1050~900 DEG C, to refine original Austria
Family name's body tissue；
3) steel ingot is quenched after forging, the quenching oil that hardening media is 60 DEG C obtains the group based on martensite
It knits；Finally carry out tempering：Tempering temperature is 560~610 DEG C, keeps the temperature 1.5~4h；
By tempering, the second-phase strength particle for being distributed small and dispersed is precipitated from martensitic matrix, obtains more
Strengthening effect is dissipated, the martensite heat-resistant steel of obdurability is obtained.
Microelement B is also added into melting steel ingot：0.10~0.5%, Co：0.10~0.5% element.
MX, M7C3 type carbonitride of tiny distribution are precipitated in prepared martensite heat-resistant steel, is uniformly distributed in geneva
In body lath.
Compared with prior art, the invention has the following beneficial technical effects：
Martensite heat-resistant steel provided by the invention and preparation method thereof, by the Alloying Design and tempering of martensite heat-resistant steel
Technique is accurately controlled and is combined, and by adjusting the content and type of alloying element, is tempered using lower temperature, is remarkably improved horse
The high temperature toughness and tenacity of family name's body heat resisting steel keeps higher-strength and hardness while obtaining high tenacity, avoids temper brittleness.
Martensite heat-resistant steel provided by the invention and preparation method thereof, in added alloying element, trace V, Nb, N can
Significantly improve the creep rupture strength of material；The elements such as W, B, Co are added, it is appropriate to reduce Mo content, it can be mentioned by optimizing heat treatment
High creep resistance energy；Cr can enhance creep rupture strength and creep strength；Si can improve inoxidizability；In melting, steel ingot is first
Higher temperature solid solution is carried out, is dissolved completely in alloying element in austenite, carries out high temperature forging later with thinning microstructure；Forging
After be quenched, obtain martensite based on tissue；Tempering is finally carried out, keeps the second of small and dispersed distribution mutually strong
Change particle (such as V/Nb carboritride MX, M2X, M7C3 and M6C) to be precipitated from martensitic matrix, obtains dispersion-strengtherning effect
Fruit.Carboritride of disperse educt etc. can play the role of pinning dislocation at high temperature, hinder dislocation motion, significantly improve horse
The obdurability of family name's body heat resisting steel.
Martensite heat-resistant steel provided by the invention passes through metallographic, scanning electron microscope and transmission electron microscope observation
Analysis, carboritride precipitation quantity is more, is in Dispersed precipitate state, predominantly M2X and M7C3 type carbide, while with few
MX the and M6C type carboritride of amount；Martensite lath obtains replys to a certain extent, is distributed in fine uniform.Mechanical property into
Row test shows that ballistic work is 132J, hardness 371HBW, tensile strength 1087MPa.
Detailed description of the invention
Fig. 1 is martensite heat-resistant steel metallographic microscope；
Fig. 2 is martensite heat-resistant steel scanning electron microscopy (SEM)；
Fig. 3 martensite heat-resistant steel transmission electron microscopy figure (TEM).
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
To overcome the problems, such as conventional martensitic heat resisting steel obdurability deficiency and temper brittleness, a kind of novel martensitic of the present invention
Heat resisting steel and preparation method thereof.The solution of the present invention main feature is shown as：
(1) based on martensite heat-resistant steel, by alloying adjust the elements such as C, Cr, Mo (reduce C content to 0.2%,
It mentions high-Cr and is up to 14%, reduce Mo content most down to 0.5%), and the elements such as appropriate W, Nb, Co, N are added, formed new
Type martensite heat-resistant steel；
(2) by tempering process control carboritride be precipitated type, pattern and distribution, diffusion-precipitation strengthen MC and
The tiny carbide of M7C3 obtains dispersion-strengthened effect, avoids temper brittleness, reach high tenacity, while keeping higher-strength and hard
Degree；
(3) it is tempered using lower temperature, simple process, high production efficiency, save the cost.
Martensite heat-resistant steel of the invention, the trade mark are represented by 15Cr12Ni2Mo2WMnSiVNbN, wherein each element content
Percentage is C：0.1~0.2；Cr：9~14；Ni：2.5~3.5；Mo：0.5~1.5；W：0.5~1.0；Mn：0.5~1.0；
Si：0.10~0.5；V：0.10~0.5；Nb：0.1~0.5；N：0.02~0.05, remaining is Fe；The carbon nitrification being wherein precipitated
Object is in Dispersed precipitate state, and the carboritride includes M2X type, M7C3 type, MX type and M6C type carbide.
Further, while the elements (B such as micro B, Co may be contained：0.10~0.5%, Co：0.10~0.5%)
Alloying element added by the present invention, wherein trace V, Nb, N are remarkably improved the creep rupture strength of material；Add
Enter the elements such as W, B, Co, it is appropriate to reduce Mo content, creep-resistant property can be improved by optimizing heat treatment；Cr can enhance high-temperature and durable
Intensity and creep strength；Si can improve inoxidizability.
MX, M7C3 the type carbonitride being precipitated, are uniformly distributed in martensite lath.
Preparation method of the invention：
First to meeting the steel ingot of 15Cr12Ni2Mo2WMnSiVNbN alloying element in 1150 DEG C~1050 DEG C temperature ranges
Higher temperature solid solution is carried out, alloying element is dissolved completely in austenite, carries out high temperature forging, forging temperature 1050 later
~900 DEG C, to reach thinning microstructure；It is quenched after forging, the quenching oil that hardening media is 60 DEG C, obtaining martensite is
Main tissue；Finally carry out tempering：Tempering temperature is 560~610 DEG C, keeps the temperature 1.5~4 hours.
Further, including following operation：
1) the element ratio melting of following mass percent is become into steel ingot：
C：0.1~0.2%；Cr：9~14%；Ni：2.5~3.5%；Mo：1.0~2.0%；W：0.5~1.0%；Mn：
0.5~1.0%；Si：0.10~0.5%；V：0.10~0.5%；Nb：0.1~0.5%；N：0.02~0.05%；Surplus is
Fe；
2) by the steel ingot of melting in 1150 DEG C~1050 DEG C progress higher temperature solid solutions, and 10~30 minutes are kept the temperature, makes to close
Gold element is dissolved completely in austenite；High temperature forging is carried out later, and forging temperature is 1050~900 DEG C, to refine original Austria
Family name's body tissue；
3) steel ingot is quenched after forging, the quenching oil that hardening media is 60 DEG C obtains the group based on martensite
It knits；Finally carry out tempering：Tempering temperature is 560~610 DEG C, keeps the temperature 1.5~4h；
By tempering, the second-phase strength particle for being distributed small and dispersed is precipitated from martensitic matrix, obtains more
Strengthening effect is dissipated, the martensite heat-resistant steel of obdurability is obtained.
MX, M7C3 type carbonitride of tiny distribution are precipitated in prepared martensite heat-resistant steel, is uniformly distributed in geneva
In body lath.
The present invention is by tempering process, the second-phase strength particle for being distributed small and dispersed, as V/Nb carboritride MX,
M2X, M7C3 and M6C etc. are precipitated from martensitic matrix, obtain dispersion-strengthened effect.Carboritride of disperse educt etc. is in height
Temperature is lower can be played the role of pinning dislocation, hinder dislocation motion, and the obdurability of martensite heat-resistant steel is significantly improved.
Specific embodiment is given below.
Embodiment 1
Novel martensitic heat resisting steel and its preparation process
Smelting steel ingot alloying element percentage is：C：0.17；Cr：14；Ni：2.8；Mo：0.7；W：0.6；Mn：0.7；Si：
0.2；V：0.15；Nb：0.17；N：0.046；Co：0.12.Steel ingot weight 12Kg.After high temperature solid solution, high temperature forging and quenching,
Tempering is carried out to blank.Tempering temperature is 575 DEG C, and tempering insulation time is 1.5 hours.
Separately sampled 3 in blank different parts, pass through metallographic, scanning electron microscope and transmission electron microscope observation
Analyze (result is as shown in Figure 1, Figure 2, Figure 3 shows), carboritride be precipitated quantity it is more, be in Dispersed precipitate state, predominantly M2X and
M7C3 type carbide, while with a small amount of MX and M6C type carboritride；Martensite lath obtain to a certain extent reply (see
Fig. 2), it is distributed in fine uniform.M2X type in the carboritride, M7C3 type carbide, MX type, in M6C type carbide, M
Indicate that the metallic elements such as Fe, V, Mo, X indicate the nonmetalloids such as C, N).
The mechanical property of 1 workpiece of embodiment is tested, ballistic work 132J, hardness 371HBW, tensile strength
1087MPa。
Embodiment 2
Novel martensitic heat resisting steel and its preparation process
Smelting steel ingot alloying element percentage is：C：0.11；Cr：11.3；Ni：3.2；Mo：1.3；W：0.8；Mn：0.55；
Si：0.12；B：0.11；Nb：0.4；N：0.034.Steel ingot weight 15Kg.After high temperature solid solution, high temperature forging and quenching, to blank
Carry out tempering.Tempering temperature is 595 DEG C, and tempering insulation time is 4 hours.
Separately sampled 3 in blank different parts, pass through metallographic, scanning electron microscope and transmission electron microscope observation
Analysis, carboritride precipitation quantity is more, is in Dispersed precipitate state, predominantly M2X and M7C3 type carbide, while with few
MX the and M6C type carboritride of amount；Martensite lath obtains replys to a certain extent, is distributed in fine uniform.
The mechanical property of 2 workpiece of embodiment is tested, ballistic work 137J, hardness 351HBW, tensile strength
973MPa。
Example given above is to realize the present invention preferably example, and the present invention is not limited to the above embodiments.This field
Technical staff's technical solution according to the present invention technical characteristic any nonessential addition, the replacement made, belong to this
The protection scope of invention.
Claims (7)
1. a kind of martensite heat-resistant steel, which is characterized in that its each element mass percent contained is：
C：0.1~0.2%；Cr：9~14%；Ni：2.5~3.5%；Mo：1.0~2.0%；W：0.5~1.0%；Mn：0.5~
1.0%；Si：0.10~0.5%；V：0.10~0.5%；Nb：0.1~0.5%；N：0.02~0.05%；Surplus is Fe；
The carboritride being wherein precipitated is in Dispersed precipitate state, and the carboritride includes M2X type, M7C3 type, MX type
With M6C type carbide.
2. martensite heat-resistant steel as described in claim 1, which is characterized in that also contain B：0.10~0.5%, Co：0.10~
0.5% element.
3. martensite heat-resistant steel as described in claim 1, which is characterized in that MX, M7C3 the type carbonitride being precipitated, uniformly
It is distributed in martensite lath.
4. martensite heat-resistant steel as described in claim 1, which is characterized in that, when carrying out tempering, tempering temperature is for it
560~610 DEG C, keep the temperature 1.5~4 hours.
5. a kind of preparation method of martensite heat-resistant steel, which is characterized in that including following operation：
1) the element ratio melting of following mass percent is become into steel ingot：
C：0.1~0.2%；Cr：9~14%；Ni：2.5~3.5%；Mo：1.0~2.0%；W：0.5~1.0%；Mn：0.5~
1.0%；Si：0.10~0.5%；V：0.10~0.5%；Nb：0.1~0.5%；N：0.02~0.05%；Surplus is Fe；
2) by the steel ingot of melting in 1150 DEG C~1050 DEG C progress higher temperature solid solutions, and 10~30 minutes are kept the temperature, keeps alloy first
Element is dissolved completely in austenite；High temperature forging is carried out later, and forging temperature is 1050~900 DEG C, to refine original austenite
Tissue；
3) steel ingot is quenched after forging, the quenching oil that hardening media is 60 DEG C obtains the tissue based on martensite；Most
After carry out tempering：Tempering temperature is 560~610 DEG C, keeps the temperature 1.5~4h；
By tempering, the second-phase strength particle for being distributed small and dispersed is precipitated from martensitic matrix, and it is strong to obtain disperse
Change effect, obtains the martensite heat-resistant steel of obdurability.
6. the preparation method of martensite heat-resistant steel as claimed in claim 5, which is characterized in that be also added into melting steel ingot
Microelement B：0.10~0.5%, Co：0.10~0.5% element.
7. the preparation method of martensite heat-resistant steel as claimed in claim 5, which is characterized in that prepared martensite heat-resistant steel
Middle MX, M7C3 type carbonitride that tiny distribution is precipitated, is uniformly distributed in martensite lath.
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