CN107587080B - A kind of precipitation strength heat resisting steel and its preparation process - Google Patents
A kind of precipitation strength heat resisting steel and its preparation process Download PDFInfo
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- CN107587080B CN107587080B CN201710965439.1A CN201710965439A CN107587080B CN 107587080 B CN107587080 B CN 107587080B CN 201710965439 A CN201710965439 A CN 201710965439A CN 107587080 B CN107587080 B CN 107587080B
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Abstract
A kind of precipitation strength heat resisting steel and its preparation process, alloying component meet following area requirement: C:0.03-0.06%, Ni:6-10% by mass percentage, Cr:8-13%, Al:1.5-2.4%, Co :≤3%, Nb :≤0.1%, Zr :≤0.1%, surplus Fe；By the alloy melting of preparation at alloy mother liquor, it is finally prepared to alloy cast ingot；By alloy cast ingot in 850-1100 DEG C of range roll forming plate；Plate after rolling is passed through into solution treatment, ageing treatment, obtains precipitation strength heat resisting steel.While heat resisting steel of the invention has excellent in strength performance, there is good Toughness.Alloy At Room Temperature tensile strength is not less than 1000MPa, and yield strength is more than 900MPa, and room temperature elongation percentage is higher than 12%, and the contraction percentage of area is higher than 50%.
Description
Technical field
The invention belongs to metal material fields, and in particular to a kind of precipitation strength heat resisting steel and its preparation process.
Background technique
High martensitic chromium heat resisting steel is widely applied due to its cheap cost and excellent performance.Higher chromium
Content ensures that alloy has good anti-oxidant, corrosion resistance, further ensures that alloy makes under harsh working condition
Use performance.Further to improve alloy mechanical property, there is research to attempt to add Ni, Al element into alloy recently, pass through promotion
The formation of the NiAl phase of small and dispersed in alloy, and alloy is made to obtain more preferably mechanical property.However, when alloying level is higher
When, often cause high temperature ferrite to be formed, and improve the ductile-brittle transition temperature of alloy simultaneously, cause alloy plasticity sharply under
Drop seriously affects alloy service performance composition.Current result of study thinks that the addition of Al element influences alloy plasticity aobvious
It writes, a small amount of Al element addition will cause alloy ductile-brittle transition temperature and improve rapidly.Therefore, Al element content does not surpass generally
Cross 1%.
Summary of the invention
The object of the present invention is to provide a kind of precipitation strength heat resisting steel and its preparation processes, and adjust simultaneously alloy at
Point, and reasonable processing and heat treatment process are combined, amplitude peak reduces alloy ductile-brittle transition temperature, so that it is good to obtain alloy
Good intensity is matched with plasticity.
In order to realize the above goal of the invention, the technical scheme adopted by the invention is as follows:
A kind of precipitation strength heat resisting steel, alloying component meet following area requirement: C:0.03- by mass percentage
0.06%, Ni:6-10%, Cr:8-13%, Al:1.5-2.4%, Co :≤3%, Nb :≤0.1%, Zr :≤0.1%, surplus is
Fe。
A further improvement of the present invention lies in that alloying component meets following area requirement: C:0.05- by mass percentage
0.06%, Ni:6%, Cr:8.5-11%, Al:2%, Co :≤3%, Nb :≤0.1%, Zr :≤0.1%, surplus Fe；
A kind of preparation process of precipitation strength heat resisting steel, comprising the following steps:
1) alloyage: alloying component meets following area requirement: C:0.03-0.06%, Ni:6- by mass percentage
10%, Cr:8-13%, Al:1.5-2.4%, Co :≤3%, Nb :≤0.1%, Zr :≤0.1%, surplus Fe；
2) melting step: by the alloy melting of preparation at alloy mother liquor, it is finally prepared to alloy cast ingot；
3) high temperature hot rolling: by alloy cast ingot in 850-1100 DEG C of range roll forming plate；
4) alloy is heat-treated: the plate after rolling being passed through solution treatment, ageing treatment, obtains precipitation strength heat resisting steel.
A further improvement of the present invention lies in that carrying out melting using vaccum sensitive stove in step 2).
A further improvement of the present invention lies in that the vacuum degree of vaccum sensitive stove is not higher than 5 × 10-3MPa。
A further improvement of the present invention lies in that being prepared into alloy cast ingot using negative pressure casting technique in step 2).
A further improvement of the present invention lies in that rolling pushing deflection is not less than 30% per pass in step 3) when rolling,
Deflection is not less than 70% after the completion of rolling.
A further improvement of the present invention lies in that the temperature of solution treatment is 1050-1200 DEG C, the time is 0.5-2 hours.
A further improvement of the present invention lies in that the temperature of ageing treatment is 700-780 DEG C, the time is 8-24 hours.
Compared with prior art, the invention has the benefit that
The present invention improves higher Ni, Al content on the basis of 9-12Cr alloy, so promoting small and dispersed in alloy
NiAl phase is precipitated；C element content is reduced to reduce influence of the chromium carbide roughening to alloy property；Cancel the ferrites such as W, Mo to be formed
The addition of element, to achieve the purpose that reduce alloy ductile-brittle transition temperature.
Have good comprehensive performance and structure stability, prolonged heat exposure item by alloy prepared by the method for the invention
Precipitate size variation is little under part.It is 80-160 microns of alloy average grain size, mainly double by martensite and reversed austenite
It mutually constitutes, wherein Martensite Volume Fraction is not less than 60%.Alloy is precipitated big after ageing treatment in intra-die even dispersion
The spherical NiAl phase of fine size is measured, precipitated phase average-size is no more than 70nm, and its volume fraction is not less than 10%.Alloy tool
While having excellent in strength performance, there is good Toughness.Alloy At Room Temperature tensile strength is not less than 1000MPa, and surrender is strong
Degree is more than 900MPa, and room temperature elongation percentage is higher than 12%, and the contraction percentage of area is higher than 50%.The alloy adapts to be used for supercritical thermal power machine
Group turbo blade, can also be applied to the fields such as aerospace, nuclear reactor and petrochemical industry, such as aircraft components, reactor component and petroleum
Tooling is standby etc..
Specific embodiment
Below with reference to embodiment, invention is further described in detail.
The present invention relates to a kind of high alumina martensitic stain less steels.
Embodiment 1
The heat-resisting steel material of the present embodiment includes: C:0.05%, Ni:6%, Cr:8.5%, Al by mass percentage:
2%, Co:3%, Nb:0.06%, Zr:0.05%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: ingredient includes: C:0.05%, Ni:6%, Cr:8.5%, Al:2%, Co by mass percentage:
3%, Nb:0.06%, Zr:0.05%, surplus Fe.
2) 5 × 10 melting step: are not higher than in vacuum degree using vaccum sensitive stove-3Under MPa by the alloy melting of preparation at
Alloy mother liquor is finally prepared into alloy cast ingot using negative pressure casting technique.
3) high temperature hot rolling: by alloy cast ingot, in 1050 DEG C of roll forming plates, rolling, rolling reduction is not low per pass
In 30%, final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1050 DEG C after solution treatment 2 hours it is air-cooled, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
Embodiment 2
The heat-resisting steel material of the present embodiment includes: C:0.05%, Ni:6%, Cr:8.5%, Al by mass percentage:
2%, Nb:0.06%, Zr:0.05%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: ingredient includes: C:0.05%, Ni:6%, Cr:8.5%, Al:2%, Nb by mass percentage:
0.06%, Zr:0.05%, surplus Fe.
2) 5 × 10 melting step: are not higher than in vacuum degree using vaccum sensitive stove-3Under MPa by the alloy melting of preparation at
Alloy mother liquor is finally prepared into alloy cast ingot using negative pressure casting technique.
3) high temperature hot rolling: by alloy cast ingot in 1050 DEG C of roll forming plates, rolling, rolling reduction is not low per pass
In 30%, final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1050 DEG C after solution treatment 2 hours it is air-cooled, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
Embodiment 3
The heat-resisting steel material of the present embodiment includes: C:0.05%, Ni:6%, Cr:11%, Al by mass percentage:
2%, Co:3%, Nb:0.06%, Zr:0.05%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: ingredient includes: C:0.05%, Ni:6%, Cr:11%, Al:2%, Co by mass percentage:
3%, Nb:0.06%, Zr:0.05%, surplus Fe.
2) 5 × 10 melting step: are not higher than in vacuum degree using vaccum sensitive stove-3Under MPa by the alloy melting of preparation at
Alloy mother liquor is finally prepared into alloy cast ingot using negative pressure casting technique.
3) high temperature hot rolling: by alloy cast ingot, in 1050 DEG C of roll forming plates, rolling, rolling reduction is not low per pass
In 30%, final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1050 DEG C after solution treatment 2 hours it is air-cooled, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
Comparative example 1
The heat-resisting steel material of the present embodiment includes: C:0.05%, Ni:6%, Cr:8.5%, Al by mass percentage:
1%, Co:3%, Nb:0.06%, Zr:0.05%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: ingredient includes: C:0.05%, Ni:6%, Cr:8.5%, Al:1%, Co by mass percentage:
3%, Nb:0.06%, Zr:0.05%, surplus Fe.
2) melting step: using vaccum sensitive stove by the alloy melting of preparation at alloy mother liquor, negative pressure casting is finally used
Technique is prepared into alloy cast ingot.
3) high temperature hot rolling: by alloy cast ingot in 1050 DEG C of roll forming plates, rolling reduction is not less than 30% per pass,
Final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1050 DEG C after solution treatment 2 hours it is air-cooled, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature.
Comparative example 2
The heat-resisting steel material of the present embodiment, includes: C:0.05%, Ni:6%, Cr:11%, Al:1% by mass percentage,
Co:3%, Nb:0.06%, Zr:0.05%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: ingredient includes: C:0.05%, Ni:6%, Cr:11%, Al:1%, Co by mass percentage:
3%, Nb:0.06%, Zr:0.05%, surplus Fe.
2) melting step: using vaccum sensitive stove by the alloy melting of preparation at alloy mother liquor, negative pressure casting is finally used
Technique is prepared into alloy cast ingot.
3) high temperature hot rolling: by alloy cast ingot in 1050 DEG C of roll forming plates, rolling reduction is not less than 30% per pass,
Final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1050 DEG C after solution treatment 2 hours it is air-cooled, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature.
Comparative example 3
The heat-resisting steel material of the present embodiment, includes: C:0.05%, Ni:6%, Cr:11%, Al:3% by mass percentage,
Co:3%, Nb:0.06%, Zr:0.05%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: ingredient includes: C:0.05%, Ni:6%, Cr:11%, Al:3%, Co by mass percentage:
3%, Nb:0.06%, Zr:0.05%, surplus Fe.
2) melting step: using vaccum sensitive stove by the alloy melting of preparation at alloy mother liquor, negative pressure casting is finally used
Technique is prepared into alloy cast ingot.
3) high temperature hot rolling: by alloy cast ingot in 1050 DEG C of roll forming plates, rolling reduction is not less than 30% per pass,
Final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1050 DEG C after solution treatment 2 hours it is air-cooled, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature.
Comparative example 4
The heat-resisting steel material of the present embodiment, includes: C:0.05%, Ni:6%, Cr:13%, Al:3% by mass percentage,
Co:3%, Nb:0.06%, Zr:0.05%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: ingredient includes: C:0.05%, Ni:6%, Cr:13% by mass percentage,
Al:3%, Co:3%, Nb:0.06%, Zr:0.05%, surplus Fe.
2) melting step: using vaccum sensitive stove by the alloy melting of preparation at alloy mother liquor, negative pressure casting is finally used
Technique is prepared into alloy cast ingot.
3) high temperature hot rolling: by alloy cast ingot in 1050 DEG C of roll forming plates, rolling reduction is not less than 30% per pass,
Final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1050 DEG C after solution treatment 2 hours it is air-cooled, then at 780 DEG C
Effect 24 hours, is finally air-cooled to room temperature.
Referring to table 1, the alloy property of embodiment and comparative example is tested respectively.From result as it can be seen that embodiment is closed
Fitting is for good comprehensive strength and toughness.When Al content is lower in alloy, intensity is obviously poor, and toughness has no significantly
It improves.And when Al content is excessively high, alloy ductility sharply declines.
1 alloy mechanical property test result of table
Embodiment 4
The heat-resisting steel material of the present embodiment includes: C:0.03%, Ni:8%, Cr:8%, Al by mass percentage:
1.5%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: pressing mentioned component alloyage raw material.
2) 5 × 10 melting step: are not higher than in vacuum degree using vaccum sensitive stove-3Under MPa by the alloy melting of preparation at
Alloy mother liquor is finally prepared into alloy cast ingot using negative pressure casting technique.
3) high temperature hot rolling: by alloy cast ingot, in 850 DEG C of roll forming plates, rolling, rolling reduction is not less than per pass
30%, final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1100 DEG C after solution treatment 2 hours it is air-cooled, then at 700 DEG C
Effect 20 hours, is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
Embodiment 5
The heat-resisting steel material of the present embodiment includes: C:0.06%, Ni:10%, Cr:13%, Al by mass percentage:
2.4%, Co:1%, Nb:0.01%, surplus Fe.
The preparation method of the present embodiment the following steps are included:
1) raw material is prepared: according to mentioned component alloyage raw material；
2) 5 × 10 melting step: are not higher than in vacuum degree using vaccum sensitive stove-3Under MPa by the alloy melting of preparation at
Alloy mother liquor is finally prepared into alloy cast ingot using negative pressure casting technique.
3) high temperature hot rolling: by alloy cast ingot, in 1100 DEG C of roll forming plates, rolling, rolling reduction is not low per pass
In 30%, final total deformation is not less than 70%.
4) alloy is heat-treated: by the plate after rolling 1200 DEG C after solution treatment 0.5 hour it is air-cooled, then at 750 DEG C
Timeliness 8 hours, it is finally air-cooled to room temperature, obtains precipitation strength heat resisting steel.
In the present invention after the completion of solution treatment, 80-160 microns of alloy average grain size, mainly by martensite and inversion
Austenitic duplex is constituted, and wherein Martensite Volume Fraction is not less than 60%.
The spherical NiAl phase of a large amount of fine sizes is precipitated after ageing treatment, in intra-die even dispersion in alloy, is precipitated
Phase average size is no more than 70nm, and its volume fraction is higher than 10%.
Alloy At Room Temperature tensile strength is not less than 1000MPa, and yield strength is more than 900MPa, and room temperature elongation percentage is higher than 12%,
The contraction percentage of area is higher than 50%.
Claims (5)
1. a kind of precipitation strength heat resisting steel, which is characterized in that alloying component meets following area requirement: C by mass percentage:
0.03-0.06%, Ni:6%, Cr:8-13%, Al:1.5-2.4%, Co:3%, Nb :≤0.1%, Zr :≤0.1%, surplus Fe；Alloy
It 80-160 microns of average grain size, is made of martensite and reversed austenite two-phase, wherein Martensite Volume Fraction is not less than
60%；Alloy At Room Temperature tensile strength is not less than 1000MPa, and yield strength is more than 900MPa, and room temperature elongation percentage is higher than 12%, and section is received
Shrinkage is higher than 50%.
2. a kind of preparation process of precipitation strength heat resisting steel, which comprises the following steps:
1) alloyage: alloying component meets following area requirement: C:0.03-0.06%, Ni:6%, Cr:8- by mass percentage
13%, Al:1.5-2.4%, Co :≤3%, Nb :≤0.1%, Zr :≤0.1%, surplus Fe；
2) melting step: by the alloy melting of preparation at alloy mother liquor, it is finally prepared to alloy cast ingot；Wherein, using vacuum sense
Furnace is answered to carry out melting, and the vacuum degree of vaccum sensitive stove is not higher than 5 × 10-3MPa；
3) high temperature hot rolling: by alloy cast ingot in 850-1100oC range roll forming plate；Wherein, when rolling, under rolling per pass
Compressive strain amount is not less than 30%, and deflection is not less than 70% after the completion of rolling；
4) alloy is heat-treated: the plate after rolling being passed through solution treatment, ageing treatment, obtains precipitation strength heat resisting steel.
3. a kind of preparation process of precipitation strength heat resisting steel according to claim 2, which is characterized in that used in step 2
Negative pressure casting technique is prepared into alloy cast ingot.
4. a kind of preparation process of precipitation strength heat resisting steel according to claim 2, which is characterized in that the temperature of solution treatment
Degree is 1050-1200oC, time are 0.5-2 hours.
5. a kind of preparation process of precipitation strength heat resisting steel according to claim 2, which is characterized in that the temperature of ageing treatment
Degree is 700-780oC, time are 8-24 hours.
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| SE543967C2 (en) * | 2020-02-11 | 2021-10-12 | Blykalla Reaktorer Stockholm Ab | A martensitic steel |
| SE2150379A1 (en) * | 2021-03-29 | 2022-07-19 | Blykalla Reaktorer Stockholm Ab | An overlay welding material |
| CN113699465B (en) * | 2021-08-26 | 2022-06-21 | 华能国际电力股份有限公司 | Ferrite-based high-strength corrosion-resistant dual-phase alloy and preparation method thereof |
| CN113981328B (en) * | 2021-09-18 | 2022-05-24 | 四川大学 | Aluminum-containing austenitic stainless steel with surface spontaneously and continuously generating aluminum oxide film and preparation method thereof |
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| CN101087897A (en) * | 2004-12-23 | 2007-12-12 | 山特维克知识产权股份有限公司 | Precipitation hardenable martensitic stainless steel |
| CN104271787A (en) * | 2012-09-27 | 2015-01-07 | 日立金属株式会社 | Precipitation hardening type martensitic steel and process for producing same |
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| CN1121962A (en) * | 1995-07-25 | 1996-05-08 | 上海钢铁研究所 | Stainless steel for protective shell of flying data recorder and producing method thereof |
| CN101087897A (en) * | 2004-12-23 | 2007-12-12 | 山特维克知识产权股份有限公司 | Precipitation hardenable martensitic stainless steel |
| CN104271787A (en) * | 2012-09-27 | 2015-01-07 | 日立金属株式会社 | Precipitation hardening type martensitic steel and process for producing same |
| CN105568151A (en) * | 2016-01-29 | 2016-05-11 | 北京科技大学 | Aluminum-strengthened maraging steel and preparing method thereof |
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