CN104818432B - A kind of alloy material for Steam Turbine rotor and preparation method thereof - Google Patents
A kind of alloy material for Steam Turbine rotor and preparation method thereof Download PDFInfo
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Abstract
It is an object of the invention to provide a kind of alloy material for Steam Turbine rotor and preparation method thereof, purpose is that the vapor (steam) temperature and the more existing unit of operating pressure for solving extra-supercritical unit are substantially improved, and current material high temperature endurance performance is difficult to meet desired problem.The alloy material includes the component of following percentage by weight：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.The present invention disclosure satisfy that high temperature, the demand of high stress condition of work, and yield strength RP0.02 >=600Mpa, can be used as supercritical turbine group high pressure, middle pressure rotor alloy material, meet use requirement of the turbine rotor under its working environment.There is the present invention preferable room temperature to draw high performance and high temperature endurance performance, can be used for overcritical, supercritical turbine group high pressure, middle pressure rotor alloy material, for promoting the application of supercritical turbine group and developing significant, worth large-scale promotion and application.
Description
Technical field
It is specially a kind of for Steam Turbine rotor the present invention relates to Material Field, especially steam turbine alloy field
Alloy material and preparation method thereof.The present invention is a kind of alloy material for supercritical turbine group rotor and its preparation side
Method, 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, with the fast development of turbine making technology, steam turbine develops to super-critical and ultra super-critical power unit
Trend is increasingly accelerated.The vapor (steam) temperature and operating pressure of steam turbine supercritical unit are respectively 520 DEG C, 15Mpa；And steam turbine is super
The vapor (steam) temperature of supercritical unit then up to 600 DEG C (higher even up to 650 DEG C), its operating pressure also reaches 26~
30MPa.Relative to steam turbine supercritical unit, the vapor (steam) temperature and operating pressure of extra-supercritical unit are higher, existing steamer
The high temperature endurance performance of machine material has been difficult to meet its requirement.
Therefore, in the urgent need to a kind of new material, to meet extra-supercritical unit the need for.
The content of the invention
Goal of the invention of the invention is：Vapor (steam) temperature and operating pressure for extra-supercritical unit is big compared with existing unit
Width is lifted, and current material high temperature endurance performance is difficult to meet desired problem, there is provided a kind of conjunction for Steam Turbine rotor
Golden material and preparation method thereof.Alloy material of the invention, disclosure satisfy that high temperature, the demand of high stress condition of work, and surrender
Intensity RP0.02>=600Mpa, can be used as supercritical turbine group high pressure, middle pressure rotor alloy material, meets turbine rotor and exists
Use requirement under its working environment.There is the present invention preferable room temperature to draw high performance and high temperature endurance performance, can be used for super facing
Boundary, supercritical turbine group high pressure, middle pressure rotor alloy material, for the application and development that promote supercritical turbine group
It is significant, it is worth large-scale promotion and application.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of alloy material for Steam Turbine rotor, including following percentage by weight component：
Balance of Fe and inevitable impurity.
Further, including following percentage by weight component：
Balance of Fe and inevitable impurity.
The impurity includes 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%；H2≤3.0ppm；O2≤35ppm。
The impurity includes following component：The P of 0.001~0.010wt%；The S of 0.001~0.005wt%；0.001~
The Si of 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%；0.01~3.0ppm
H2；The O of 0.01~35ppm2。
The preparation method of the alloy material of Steam Turbine rotor is previously used for, is comprised the following steps：
(1) by the proportioning of alloy material, raw material is weighed, raw material is placed in melting in vaccum sensitive stove, smelting temperature 1580
~1600 DEG C, in fusion process, the content of each element is adjusted, its weight ratio is met design requirement, and control impurity element
Content, finally pours into consutrode by the solution that melting is obtained；
(2) consutrode of preparation is placed in remelting refining in electroslag furnace, further reduces the content of impurity element, finally
Remelting is into ESR ingot.
The ESR ingot that will be obtained is heated to 850~870 DEG C, is incubated 2~4h, then is warming up to 1150~1170 DEG C, and insulation 3~
After 5h, forged；Annealing heat-treats are carried out after forging, is surface-treated after annealing heat-treats, obtain finished product rod iron.
The step of annealing heat-treats and technological parameter are as follows：
Quenching：1090~1110 DEG C of heating-up temperature, 1~4 hour time, the type of cooling：Water-cooled；
It is tempered for the first time：560~580 DEG C of heating-up temperature, 1~6 hour time, the type of cooling：Air cooling；
It is tempered for second：680~750 DEG C of heating-up temperature, 2~12 hours time, the type of cooling：Air cooling.
It is surface-treated after annealing heat-treats, forging is carried out into surface grinding or the treatment of car light, is eliminated forging surface and lack
Fall into, and the size of forging, shape, surface quality is met design requirement, obtain finished product rod iron.
For foregoing problems, the present invention provides a kind of alloy material for Steam Turbine rotor and preparation method thereof.It is right
Steel of the invention carry out tensile test at room temperature, and its testing index reaches following requirement：Tensile strength Rm≥820Mpa；Surrender is strong
Degree RP0.2≥700Mpa；Yield strength RP0.02≥600Mpa；Elongation A5>=15%；Contraction percentage of area Z >=35%；Charpy (V-type
Breach) ballistic work >=14.1J.
Hot test is carried out to steel of the invention, its high temperature endurance performance is tested, index reaches following requirement：
575 DEG C of test temperature, proof stress 308Mpa, rupture time >=100h；
600 DEG C of test temperature, proof stress 264Mpa, rupture time >=100h；
625 DEG C of test temperature, proof stress 215Mpa, rupture time >=100h；
650 DEG C of test temperature, proof stress 171Mpa, rupture time >=100h.
Meanwhile, as can be seen that the performance of the alloy material in embodiment is as follows from embodiments of the invention：Tensile strength
RmIt is 834~867Mpa；Yield strength RP0.2Up to 720~737Mpa；Yield strength RP0.02Up to 616~641Mpa；Elongation A5It is situated between
Between 16%~17%；Charpy (v-notch) ballistic work is up to 15~21J.The experimental result of embodiment further demonstrates that, this hair
Bright material has preferable performance, and high temperature endurance performance is more preferably, disclosure satisfy that the job requirement of extra-supercritical unit rotor,
Can be used as overcritical, supercritical turbine group high pressure, middle pressure rotor alloy material, with preferable application prospect, for promoting
Enter the application of supercritical turbine group and develop significant.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine by any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be equivalent or with similar purpose by other
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics
.
Embodiment
The embodiment of the present invention comprises the following steps.
1st, ESR ingot is prepared
(1) raw material is weighed by proportioning, the content of chemical element is adjusted in vacuum induction furnace smelting, fusion process, make it
Percentage by weight is as shown in table 1.
The percentage by weight of the embodiment 1-5 of table 1
In fusion process, control the content of impurity element as far as possible low, and the solution that melting is obtained is poured into from power consumption
Pole.
(2) consutrode of preparation is placed in remelting refining in electroslag furnace, further reduces the content of impurity element, make it
Meet following requirements：
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；
Balance of 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%；
H2≤3.0ppm；O2≤35ppm。
After sampling analysis each component content is qualified, ESR ingot is made.
2nd, ESR ingot is made forging
(1) ESR ingot heats forged is made forging, step and technological parameter are as follows：ESR ingot is heated to 850~870
DEG C, after being incubated 2~4 hours, 1150 DEG C~1070 DEG C are warming up to, 3~5 hours are incubated, start forging.
(2) after forging, the step of carry out annealing heat-treats, annealing heat-treats and technological parameter is as follows：
Quenching：1090~1110 DEG C of heating-up temperature, 1~4 hour time, the type of cooling：Water-cooled；
It is tempered for the first time：560~580 DEG C of heating-up temperature, 1~6 hour time, the type of cooling：Air cooling；
It is tempered for second：680~750 DEG C of heating-up temperature, 2~12 hours time, the type of cooling：Air cooling.
(3) after annealing heat-treats, roughing treatment is carried out to finished product forging surface, eliminates surface defect and make forging chi
Very little, shape, surface quality meet design requirement, finished product forging.
(4) the inspection by sampling mechanical property on finished product forging, carries out corresponding mechanical property test.
3rd, mechanical property test experiment
Tensile test at room temperature is carried out 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 2 embodiment of table 1~4
| Rm(Mpa) | 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 |
Hot test is carried out 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 the embodiment 1 of table 3
| Temperature | Stress | Test requirements document | Testing result |
| ℃ | Mpa | h | h |
| 575 | 308 | ≥100 | 102、102 |
| 600 | 264 | ≥100 | 102、102 |
| 625 | 215 | ≥100 | 102、102 |
| 650 | 171 | ≥100 | 102、102 |
Hot test is carried out 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 the embodiment 2 of table 4
| Temperature | Stress | Test requirements document | Testing result |
| ℃ | Mpa | h | h |
| 575 | 308 | ≥100 | 102、102 |
| 600 | 264 | ≥100 | 102、102 |
| 625 | 215 | ≥100 | 102、102 |
| 650 | 171 | ≥100 | 102、102 |
Hot test is carried out 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 the embodiment 3 of table 5
| Temperature | Stress | Test requirements document | Testing result |
| ℃ | Mpa | h | h |
| 575 | 308 | ≥100 | 101、101 |
| 600 | 264 | ≥100 | 101、101 |
| 625 | 215 | ≥100 | 101、101 |
| 650 | 171 | ≥100 | 101、101 |
Hot test is carried out 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 the embodiment 4 of table 6
| Temperature | Stress | Test requirements document | Testing 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 |
Result of the test shows：The mechanical property of alloy material prepared by the embodiment of the present invention fully meets ultra supercritical steam turbine
The use requirement of unit high pressure, middle pressure rotor under relevant work environment, can be used to making supercritical turbine group, overcritical
The high pressure of Steam Turbine, middle pressure rotor.
The invention is not limited in foregoing specific embodiment.The present invention is expanded to and any in this manual disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (3)
1. a kind of alloy material for Steam Turbine rotor, it is characterised in that the component including following percentage by weight：
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%；
Balance of Fe and inevitable impurity；
The impurity includes 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%；H2≤3.0ppm；O2≤
35ppm；
The alloy material is prepared from using the method for comprising the following steps：
（1）By the proportioning of alloy material, raw material is weighed, raw material is placed in melting in vaccum sensitive stove, smelting temperature 1580 ~ 1600
DEG C, in fusion process, the content of each element is adjusted, its weight ratio is met design requirement, and impurity content is controlled, most
The solution that melting is obtained is poured into consutrode afterwards；
（2）The consutrode of preparation is placed in remelting refining in electroslag furnace, the content of impurity element, final remelting is further reduced
Into ESR ingot；
The ESR ingot that will be obtained is heated to 850 ~ 870 DEG C, is incubated 2 ~ 4h, then is warming up to 1150 ~ 1170 DEG C, after 3 ~ 5h of insulation, enters
Row forging；Annealing heat-treats are carried out after forging, is surface-treated after annealing heat-treats, obtain finished product rod iron；
The step of annealing heat-treats and technological parameter are as follows：
Quenching：1090 ~ 1110 DEG C of heating-up temperature, 1 ~ 4 hour time, the type of cooling：Water-cooled；
It is tempered for the first time：560 ~ 580 DEG C of heating-up temperature, 1 ~ 6 hour time, the type of cooling：Air cooling；
It is tempered for second：680 ~ 750 DEG C of heating-up temperature, 2 ~ 12 hours time, the type of cooling：Air cooling；
It is surface-treated after annealing heat-treats, forging is carried out into surface grinding or the treatment of car light, is eliminated forging surface defect, and
The size of forging, shape, surface quality is met design requirement, obtain finished product rod iron.
2. the alloy material of Steam Turbine rotor is used for according to claim 1, it is characterised in that including following weight percent
The component of ratio：
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%；
Balance of Fe and inevitable impurity.
3. the alloy material for Steam Turbine rotor according to claim 1 or claim 2, it is characterised in that the impurity includes
Following component：The P of 0.001 ~ 0.010wt%；The S of 0.001 ~ 0.005wt%；The Si of 0.001 ~ 0.08wt%；0.001~0.08wt%
W；The Al of 0.001 ~ 0.008wt%；The Cu of 0.001 ~ 0.07wt%；The Sb of 0.001 ~ 0.0012wt%；0.001 ~ 0.007wt%'s
Sn；The As of 0.001 ~ 0.012wt%；The H of 0.01 ~ 3.0ppm2；The O of 0.01 ~ 35ppm2。
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| JP2018053332A (en) * | 2016-09-30 | 2018-04-05 | 日立金属株式会社 | Method for manufacturing turbine material |
| CN106381374A (en) * | 2016-11-30 | 2017-02-08 | 四川六合锻造股份有限公司 | Method for improving transverse impact toughness of 1Cr12Ni3Mo2VN |
| CN108359887B (en) * | 2017-01-26 | 2019-10-11 | 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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| JPH09287402A (en) * | 1996-04-22 | 1997-11-04 | Hitachi Ltd | Rotor shaft for steam turbine, steam turbine power generating plant, and steam turbine thereof |
| CN102191439A (en) * | 2011-04-27 | 2011-09-21 | 四川六合锻造股份有限公司 | Stainless steel material used for blades and bolts of nuclear power steam turbine and preparation method thereof |
| CN103160745B (en) * | 2013-02-25 | 2015-08-26 | 宝钢特钢有限公司 | A kind of Large-tonnage high-Ta low-activation martensitic steel for nuclear fusion reactor and manufacture method thereof |
| CN103695798A (en) * | 2013-12-12 | 2014-04-02 | 四川六合锻造股份有限公司 | Heat-resisting steel material used as ultra supercritical steam turbine rotor and preparation method thereof |
| CN104498843B (en) * | 2014-12-26 | 2016-09-07 | 上海申江锻造有限公司 | A kind of manufacture method utilizing ferritic stainless steel to produce valve disc forging |
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Address after: 621709 Yanghe Village, Sanhe Town, Jiangyou City, Mianyang City, Sichuan Province Patentee after: Sichuan Liuhe Special Metal Materials Co., Ltd. Address before: 621007 West Section of Baolun Road, Henan Industrial Park, Jiangyou City, Mianyang City, Sichuan Province Patentee before: Sichuan Liuhe Forging Company Ltd. |