CN104818432A - Alloy material for turboset rotor and preparation method thereof - Google Patents
Alloy material for turboset rotor and preparation method thereof Download PDFInfo
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Abstract
The invention aims at providing an alloy material for a turboset rotor and a preparation method thereof and solves the problems that the steam temperature and the work pressure of an ultra supercritical unit are higher than those of the current unit and the high-temperature endurance property of the current material cannot meet the requirement. The alloy material comprises the following components by weight percentage: 0.12-0.14wt% of C, 0.30-0.40wt% of Mn, 9.10-0.50wt% of Cr, 1.45-1.55 wt% of Mo, 0.10-0.20 wt% of Ni, 0.18-0.22 wt% of V, 1.20-1.40 wt% of Co, 0.040-0.060 wt% of Nb, 0.015-0.030wt% of N, and 0.008-0.010wt% of B. By adopting the alloy material, the requirements of high temperature and high stress work condition can be met, the yield strength RP 0.02 is greater than or equal to 600 MPa, the alloy material can be used as an ultra supercritical turboset high-pressure and medium-pressure rotor alloy material, and the using requirement of a steam turbine rotor under the work environment is met. The alloy material is excellent in room-temperature pull-up performance and high-temperature endurance property, can be used as an supercritical and ultra supercritical turboset high-pressure and medium-pressure rotor alloy material, has important meaning for promoting the application and development of the ultra supercritical turboset and is worthy of large-scale popularization and application.
Description
Technical field
The present invention relates to Material Field, especially steam turbine alloy field, be specially a kind of alloy material for Steam Turbine rotor and preparation method thereof.The present invention is a kind of alloy material for supercritical turbine group rotor and preparation method thereof, and further, it is a kind of for supercritical turbine group high pressure, middle pressure rotor alloy material and preparation method thereof.
Background technology
In recent years, along with the fast development of turbine making technology, the trend that steam turbine develops to super-critical and ultra super-critical power unit is accelerated day by day.The vapor temperature of steam turbine supercritical unit and operating pressure are respectively 520 DEG C, 15Mpa; Then up to 600 DEG C (higher even reaches 650 DEG C), its operating pressure also reaches 26 ~ 30MPa to the vapor temperature of steam turbine extra-supercritical unit.Relative to steam turbine supercritical unit, vapor temperature and the operating pressure of extra-supercritical unit are higher, and the high temperature endurance performance of existing turbine materials has been difficult to meet its requirement.
Therefore, in the urgent need to a kind of new material, to meet the needs of extra-supercritical unit.
Summary of the invention
Goal of the invention of the present invention is: significantly promote for the vapor temperature of extra-supercritical unit and the more existing unit of operating pressure, and current material high temperature endurance performance is difficult to the problem that meets the demands, provides a kind of alloy material for Steam Turbine rotor and preparation method thereof.Alloy material of the present invention, can meet the demand of high temperature, heavily stressed working conditions, and yield strength R
p0.02>=600Mpa, can be used as supercritical turbine group high pressure, middle pressure rotor alloy material, meets the service requirements of turbine rotor under its Working environment.The present invention has good room temperature and draws high performance and high temperature endurance performance, can be used for overcritical, supercritical turbine group high pressure, middle pressure rotor alloy material, for promoting that the application and development of supercritical turbine group is significant, be worth large-scale promotion and application.
To achieve these goals, the present invention adopts following technical scheme:
For an alloy material for Steam Turbine rotor, comprise the component of following weight percent:
Surplus is Fe and inevitable impurity.
Further, the component of following weight percent is comprised:
Surplus is Fe and inevitable impurity.
Described impurity comprises following component: P≤0.010wt%; S≤0.005wt%; Si≤0.08wt%; W≤0.08wt%; Al≤0.008wt%; Cu≤0.07wt%; Sb≤0.0012wt%; Sn≤0.007wt%; As≤0.012wt%; H
2≤ 3.0ppm; O
2≤ 35ppm.
Described impurity comprises following component: the P of 0.001 ~ 0.010wt%; The S of 0.001 ~ 0.005wt%; The Si of 0.001 ~ 0.08wt%; The W of 0.001 ~ 0.08wt%; The Al of 0.001 ~ 0.008wt%; The Cu of 0.001 ~ 0.07wt%; The Sb of 0.001 ~ 0.0012wt%; The Sn of 0.001 ~ 0.007wt%; The As of 0.001 ~ 0.012wt%; The H of 0.01 ~ 3.0ppm
2; The O of 0.01 ~ 35ppm
2.
The preparation method of the aforementioned alloy material for Steam Turbine rotor, comprises the steps:
(1) by the proportioning of alloy material, take raw material, raw material is placed in vacuum induction furnace melting, smelting temperature 1580 ~ 1600 DEG C, in fusion process, regulate the content of each element, make its weight ratio meet design requirements, and control impurity content, finally the solution casting that melting obtains is become consumable electrode;
(2) consumable electrode of preparation is placed in electroslag furnace remelting refining, reduce the content of impurity element further, final remelting becomes ESR ingot.
The ESR ingot obtained is heated to 850 ~ 870 DEG C, insulation 2 ~ 4h, then is warming up to 1150 ~ 1170 DEG C, after insulation 3 ~ 5h, forge; Carry out annealing thermal treatment after forging, carry out surface treatment after annealing thermal treatment, obtain finished product rod iron.
Heat treated step of annealing and processing parameter as follows:
Quenching: Heating temperature 1090 ~ 1110 DEG C, 1 ~ 4 hour time, the type of cooling: water-cooled;
First time tempering: Heating temperature 560 ~ 580 DEG C, 1 ~ 6 hour time, the type of cooling: air cooling;
Second time tempering: Heating temperature 680 ~ 750 DEG C, 2 ~ 12 hours time, the type of cooling: air cooling.
Carry out surface treatment after annealing thermal treatment, forging is carried out surface grinding or car optical processing, eliminate forging surface imperfection, and the size of forging, shape, surface quality are met design requirement, obtain finished product rod iron.
For foregoing problems, the invention provides a kind of alloy material for Steam Turbine rotor and preparation method thereof.Carry out tensile test at room temperature to steel of the present invention, its testing index reaches following requirement: tensile strength R
m>=820Mpa; Yield strength R
p0.2>=700Mpa; Yield strength R
p0.02>=600Mpa; Elongation A
5>=15%; Relative reduction in area Z>=35%; Summer ratio (v-notch) ballistic work>=14.1J.
Carry out high temperature test to steel of the present invention, test its high temperature endurance performance, index reaches following requirement:
Test temperature 575 DEG C, proof stress 308Mpa, rupture time >=100h;
Test temperature 600 DEG C, proof stress 264Mpa, rupture time >=100h;
Test temperature 625 DEG C, proof stress 215Mpa, rupture time >=100h;
Test temperature 650 DEG C, proof stress 171Mpa, rupture time >=100h.
Meanwhile, as can be seen from embodiments of the invention, the performance of the alloy material in embodiment is as follows: tensile strength R
mbe 834 ~ 867Mpa; Yield strength R
p0.2reach 720 ~ 737Mpa; Yield strength R
p0.02reach 616 ~ 641Mpa; Elongation A
5between 16% ~ 17%; Summer ratio (v-notch) ballistic work reaches 15 ~ 21J.The experimental result of embodiment shows further, material of the present invention has good performance, and high temperature endurance performance is better, the job requirement of extra-supercritical unit rotor can be met, can be used as overcritical, supercritical turbine group high pressure, middle pressure rotor alloy material, there is good application prospect, for promoting that the application and development of supercritical turbine group is significant.
Embodiment
All features disclosed in this specification sheets, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification sheets, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Embodiment
The embodiment of the present invention comprises the steps.
1, ESR ingot is prepared
(1) take raw material by proportioning, at vacuum induction furnace smelting, in fusion process, regulate the content of chemical element, make its weight percent as shown in table 1.
The weight percent of table 1 embodiment 1-5
In fusion process, the content controlling impurity element is as far as possible low, and solution casting melting obtained becomes consumable electrode.
(2) consumable electrode of preparation is placed in electroslag furnace remelting refining, reduces the content of impurity element further, make it meet following requirement:
The C of 0.12 ~ 0.14wt%; The Mn of 0.30 ~ 0.40wt%;
The Cr of 9.10 ~ 9.50wt%; The Mo of 1.45 ~ 1.55wt%;
The Ni of 0.10 ~ 0.20wt%; The V of 0.18 ~ 0.22wt%;
The Co of 1.20 ~ 1.40wt%; The Nb of 0.040 ~ 0.060wt%;
The N of 0.015 ~ 0.030wt%; 0.008 ~ 0.010wt%B;
Surplus is Fe and inevitable impurity.
Meanwhile, impurity meets following requirement:
P≤0.010wt％；S≤0.005wt％；
Si≤0.08wt％；W≤0.08wt％；
Al≤0.008wt％；Cu≤0.07wt％；
Sb≤0.0012wt％；Sn≤0.007wt％；
As≤0.012wt％；
H
2≤3.0ppm；O
2≤35ppm。
After each component concentration of sampling analysis is qualified, make ESR ingot.
2, ESR ingot is made forging
(1) ESR ingot heats forged is made forging, step and processing parameter as follows: ESR ingot is heated to 850 ~ 870 DEG C, is incubated after 2 ~ 4 hours, is warming up to 1150 DEG C ~ 1070 DEG C, be incubated 3 ~ 5 hours, start forging.
(2) forging after, carry out annealing thermal treatment, heat treated step of annealing and processing parameter as follows:
Quenching: Heating temperature 1090 ~ 1110 DEG C, 1 ~ 4 hour time, the type of cooling: water-cooled;
First time tempering: Heating temperature 560 ~ 580 DEG C, 1 ~ 6 hour time, the type of cooling: air cooling;
Second time tempering: Heating temperature 680 ~ 750 DEG C, 2 ~ 12 hours time, the type of cooling: air cooling.
(3) anneal after thermal treatment, roughing process is carried out to finished product forging surface, eliminate surface imperfection and forging ' s block dimension, shape, surface quality are met design requirement, obtained finished product forging.
(4) inspection by sampling mechanical property on finished product forging, carries out corresponding mechanical property test.
3, mechanical property test test
Carry out tensile test at room temperature to finished product forging prepared by embodiment 1 ~ 4, its measurement result is as shown in table 2 below.
The tensile test at room temperature measurement result of finished product forging prepared by table 2 embodiment 1 ~ 4
| Rm(Mpa) | R p0.02(Mpa) | R p0.2(Mpa) | A 5(％) | Z(％) | Akv(J) | |
| Embodiment 1 | 852 | 636 | 731 | 16 | 57 | 16、21、20 |
| Embodiment 2 | 867 | 641 | 737 | 16.5 | 59 | 15、17、19 |
| Embodiment 3 | 834 | 616 | 725 | 17 | 58 | 18、18、20 |
| Embodiment 4 | 841 | 624 | 720 | 17 | 58 | 19、17、21 |
Carry out high temperature test to finished product forging prepared by embodiment 1, its high temperature endurance performance is as shown in table 3 below.
The high temperature endurance performance of the finished product forging of table 3 embodiment 1
| Temperature | Stress | Test requirements document | Detected result |
| ℃ | Mpa | h | h |
| 575 | 308 | ≥100 | 102、102 |
| 600 | 264 | ≥100 | 102、102 |
| 625 | 215 | ≥100 | 102、102 |
| 650 | 171 | ≥100 | 102、102 |
Carry out high temperature test to finished product forging prepared by embodiment 2, its high temperature endurance performance is as shown in table 4 below.
The high temperature endurance performance of the finished product forging of table 4 embodiment 2
| Temperature | Stress | Test requirements document | Detected result |
| ℃ | Mpa | h | h |
| 575 | 308 | ≥100 | 102、102 |
| 600 | 264 | ≥100 | 102、102 |
| 625 | 215 | ≥100 | 102、102 |
| 650 | 171 | ≥100 | 102、102 |
Carry out high temperature test to finished product forging prepared by embodiment 3, its high temperature endurance performance is as shown in table 5 below.
The high temperature endurance performance of the finished product forging of table 5 embodiment 3
| Temperature | Stress | Test requirements document | Detected result |
| ℃ | Mpa | h | h |
| 575 | 308 | ≥100 | 101、101 |
| 600 | 264 | ≥100 | 101、101 |
| 625 | 215 | ≥100 | 101、101 |
| 650 | 171 | ≥100 | 101、101 |
Carry out high temperature test to finished product forging prepared by embodiment 4, its high temperature endurance performance is as shown in table 6 below.
The high temperature endurance performance of the finished product forging of table 6 embodiment 4
| Temperature | Stress | Test requirements document | Detected result |
| ℃ | Mpa | h | h |
| 575 | 308 | ≥100 | 101.5、101.5 |
| 600 | 264 | ≥100 | 101.5、101.5 |
| 625 | 215 | ≥100 | 101.5、101.5 |
| 650 | 171 | ≥100 | 101.5、101.5 |
Test-results shows: the mechanical property of alloy material prepared by the embodiment of the present invention meets supercritical turbine group high pressure, the service requirements of middle pressure rotor under relevant work environment completely, can be used for making supercritical turbine group, the high pressure of supercritical steam turbine units, middle pressure rotor.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (8)
1. for an alloy material for Steam Turbine rotor, it is characterized in that, comprise the component of following weight percent:
C 0.12~0.14%；
Mn 0.30~0.40%；
Cr 9.10~9.50%；
Mo 1.45~1.55%；
Ni 0.10~0.20%；
V 0.18~0.22%；
Co 1.20~1.40%；
Nb 0.040~0.060%；
N 0.015~0.030%；
B 0.008~0.010%；
Surplus is Fe and inevitable impurity.
2. according to claim 1 for the alloy material of Steam Turbine rotor, it is characterized in that, comprise the component of following weight percent:
C 0.125%；
Mn 0.37%；
Cr 9.41%；
Mo 1.50%；
Ni 0.15%；
V 0.19%；
Co 1.31%；
Nb 0.054%；
N 0.017%；
B 0.0090%；
Surplus is Fe and inevitable impurity.
3. according to claim 1 or 2 for the alloy material of Steam Turbine rotor, it is characterized in that, described impurity comprises following component: P≤0.010wt%; S≤0.005wt%; Si≤0.08wt%; W≤0.08wt%; Al≤0.008wt%; Cu≤0.07wt%; Sb≤0.0012wt%; Sn≤0.007wt%; As≤0.012wt%; H
2≤ 3.0ppm; O
2≤ 35ppm.
4. according to claim 3 for the alloy material of Steam Turbine rotor, it is characterized in that, described impurity comprises following component: the P of 0.001 ~ 0.010wt%; The S of 0.001 ~ 0.005wt%; The Si of 0.001 ~ 0.08wt%; The W of 0.001 ~ 0.08wt%; The Al of 0.001 ~ 0.008wt%; The Cu of 0.001 ~ 0.07wt%; The Sb of 0.001 ~ 0.0012wt%; The Sn of 0.001 ~ 0.007wt%; The As of 0.001 ~ 0.012wt%; The H of 0.01 ~ 3.0ppm
2; The O of 0.01 ~ 35ppm
2.
5. according to any one of claim 1-4 for the preparation method of the alloy material of Steam Turbine rotor, it is characterized in that, comprise the steps:
(1) by the proportioning of alloy material, take raw material, raw material is placed in vacuum induction furnace melting, smelting temperature 1580 ~ 1600 DEG C, in fusion process, regulate the content of each element, make its weight ratio meet design requirements, and control impurity content, finally the solution casting that melting obtains is become consumable electrode;
(2) consumable electrode of preparation is placed in electroslag furnace remelting refining, reduce the content of impurity element further, final remelting becomes ESR ingot.
6. according to claim 5 or 6 for the preparation method of the alloy material of Steam Turbine rotor, it is characterized in that, the ESR ingot obtained is heated to 850 ~ 870 DEG C, insulation 2 ~ 4h, then is warming up to 1150 ~ 1170 DEG C, after insulation 3 ~ 5h, forges; Carry out annealing thermal treatment after forging, carry out surface treatment after annealing thermal treatment, obtain finished product rod iron.
7. according to claim 5 or 6 for the preparation method of the alloy material of Steam Turbine rotor, it is characterized in that, heat treated step of annealing and processing parameter as follows:
Quenching: Heating temperature 1090 ~ 1110 DEG C, 1 ~ 4 hour time, the type of cooling: water-cooled;
First time tempering: Heating temperature 560 ~ 580 DEG C, 1 ~ 6 hour time, the type of cooling: air cooling;
Second time tempering: Heating temperature 680 ~ 750 DEG C, 2 ~ 12 hours time, the type of cooling: air cooling.
8. according to claim 5 or 6 for the preparation method of the alloy material of Steam Turbine rotor, it is characterized in that, surface treatment is carried out after annealing thermal treatment, forging is carried out surface grinding or car optical processing, eliminate forging surface imperfection, and the size of forging, shape, surface quality are met design requirement, obtain finished product rod iron.
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| CN108359887A (en) * | 2017-01-26 | 2018-08-03 | 国家电投集团科学技术研究院有限公司 | Steel and its preparation method and application |
| CN110819782A (en) * | 2019-11-06 | 2020-02-21 | 江阴市恒润环锻有限公司 | Forging method of high-temperature-resistant ring piece for steam turbine |
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