CN110373527A - A kind of heat treatment method improving supercritical turbine heat resisting cast steel material creep rupture strength - Google Patents
A kind of heat treatment method improving supercritical turbine heat resisting cast steel material creep rupture strength Download PDFInfo
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- CN110373527A CN110373527A CN201910820553.4A CN201910820553A CN110373527A CN 110373527 A CN110373527 A CN 110373527A CN 201910820553 A CN201910820553 A CN 201910820553A CN 110373527 A CN110373527 A CN 110373527A
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—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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- 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
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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
- C22C38/18—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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Abstract
A kind of heat treatment method improving supercritical turbine heat resisting cast steel material creep rupture strength, is related to a kind of heat treatment method of steam turbine heat resisting cast steel material.The present invention is to solve the technical problems that existing supercritical turbine can be poor with heat resisting cast steel material permanence.The present invention: one, conditioning treatment；Two, property heat treatment.The present invention passes through the content for limiting each element in hot-cast Steel material, so that Cr equivalent avoids the occurrence of harmful phase δ-ferritic appearance 8%~9%.Present invention process strong operability, for ZG13Cr10Mo1W1VNbN creep rupture performance under 670 DEG C and 98MPa of pressure, rupture time can achieve 464h.The present invention is suitable for steam turbine field.
Description
Technical field
The present invention relates to a kind of steam turbine heat treatment methods of heat resisting cast steel material.
Background technique
ZG13Cr10Mo1W1VNbN is a kind of plus the modified form 9%-12%Cr heat resisting cast steel material of Mo, W, is widely used in
The high-temperature components such as supercritical turbine cylinder, valve casing, valve deck.The composition of steel is complicated, the manufacture work such as smelting, casting, heat treatment
Skill is complicated, and high-temperature behavior requires very high.In actual production, enduring quality is difficult to meet standard requirements.In order to improve persistence
It can, it is necessary to formulate reasonable technological procedure, and accurately be controlled in the actual production process.
Summary of the invention
The present invention is to solve existing supercritical turbine with heat resisting cast steel material permanence can difference technical problem,
And provide a kind of method for improving supercritical turbine heat resisting cast steel material creep rupture strength.
The heat treatment method of raising supercritical turbine heat resisting cast steel material creep rupture strength of the invention presses following step
It is rapid to carry out:
One, conditioning treatment: improving supercritical turbine heat resisting cast steel material in temperature is 750 DEG C~790 DEG C
Under the conditions of keep the temperature 12h~15h, furnace cooling；
Two, property heat treatment: improving supercritical turbine heat resisting cast steel material in temperature is 1090 DEG C~1130 DEG C
Under conditions of keep the temperature 1h~1.5h/25mm, it is then air-cooled or oily cold, temperature be 720 DEG C~740 DEG C under conditions of heat preservation 1h~
1.5h/25mm takes out sample, in air natural cooling from furnace, that is, completes heat treatment；
The supercritical turbine heat resisting cast steel material by mass fraction composition it is as follows: C be 0.12%~
0.14%, Si be 0.3%~0.42%, Mn be 0.6%~1%, S be 0.001%~0.008%, P be 0.015%~
0.02%, Ni be 0.6%~0.75%, Cr be 9.2%~9.7%, Mo be 0.95%~1%, V be V be 0.2%~
It is 0.05%~0.08%, N is 0.045%~0.06% that 0.22%, W, which are 0.95%~1%, Nb, surplus Fe.
The present invention is needed before the heat treatment successively by steel-making and casting, is common process.
Invention effect:
The present invention passes through the content for limiting each element in hot-cast Steel material, so that Cr equivalent avoids out 8%~9%
Existing harmful phase δ-ferritic appearance.
Cr equivalent (Cr-eq) calculation formula is as follows:
Cr-eq=Cr+6Si+4Mo+1.5W+11V+5Nb-40C-30N-4Ni-2Mn, each element represents this in formula
Mass fraction of the element in hot-cast Steel material.
Present invention process strong operability, ZG13Cr10Mo1W1VNbN creep rupture performance are answered 670 DEG C and 98MPa's
Under power, rupture time can achieve 464h.
Specific embodiment
Specific embodiment 1: present embodiment is that a kind of raising supercritical turbine heat resisting cast steel material is persistently strong
The heat treatment method of degree, specifically:
One, conditioning treatment: improving supercritical turbine heat resisting cast steel material in temperature is 750 DEG C~790 DEG C
Under the conditions of keep the temperature 12h~15h, furnace cooling；
Two, property heat treatment: improving supercritical turbine heat resisting cast steel material in temperature is 1090 DEG C~1130 DEG C
Under conditions of keep the temperature 1h~1.5h/25mm, it is then air-cooled or oily cold, temperature be 720 DEG C~740 DEG C under conditions of heat preservation 1h~
1.5h/25mm takes out sample, in air natural cooling from furnace, that is, completes heat treatment；
The supercritical turbine heat resisting cast steel material by mass fraction composition it is as follows: C be 0.12%~
0.14%, Si be 0.3%~0.42%, Mn be 0.6%~1%, S be 0.001%~0.008%, P be 0.015%~
It is 9.2%~9.7%, Mo be 0.95%~1%, V is 0.2%~0.22%, W that 0.02%, Ni, which are 0.6%~0.75%, Cr,
It is 0.05%~0.08%, N for 0.95%~1%, Nb is 0.045%~0.06%, surplus Fe.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: in step 1 temperature be 770
12h, furnace cooling are kept the temperature under conditions of DEG C.Other are same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that: in temperature in step 2
1h/25mm is kept the temperature under conditions of being 1110 DEG C, it is then air-cooled or oily cold, 1h/25mm is kept the temperature under conditions of temperature is 730 DEG C,
Sample is taken out, in air natural cooling from furnace, that is, completes heat treatment.Other are the same as one or two specific embodiments.
Specific embodiment 4: unlike one of present embodiment and specific embodiment one to three: described is super
Critical steam turbine is as follows by the composition of mass fraction with heat resisting cast steel material: C 0.13%, Si 0.3%, Mn 0.83%, S
For 0.004%, P 0.018%, Ni 0.67%, Cr 9.55%, Mo 0.95%, V 0.21%, W 0.95%, Nb
For 0.072%, N 0.45%, surplus Fe.Other are identical as one of specific embodiment one to three.
Specific embodiment 5: present embodiment is unlike specific embodiment four: the ultra supercritical steam turbine
Machine is as follows by the composition of mass fraction with heat resisting cast steel material: C 0.13%, Si 0.41%, Mn 0.77%, S are
0.006%, P 0.019%, Ni 0.75%, Cr 9.52%%, Mo 0.98%, V 0.2%, W 0.99%, Nb are
0.061%, N 0.48%, surplus Fe.Other are identical as specific embodiment four.
The present invention is verified with following tests:
Test one: this test is a kind of heat treatment side for improving supercritical turbine heat resisting cast steel material creep rupture strength
Method, specifically:
One, it conditioning treatment: improves supercritical turbine and is protected under conditions of temperature is 770 DEG C with heat resisting cast steel material
Warm 12h, furnace cooling；
Two, property heat treatment: supercritical turbine heat resisting cast steel material is improved under conditions of temperature is 1110 DEG C
1h/25mm is kept the temperature, it is then air-cooled, 1h/25mm is kept the temperature under conditions of temperature is 730 DEG C, sample is taken out from furnace, in air
Middle natural cooling completes heat treatment；
The supercritical turbine is as follows by the composition of mass fraction with heat resisting cast steel material: C 0.13%, Si are
0.3%, Mn 0.83%, S 0.004%, P 0.018%, Ni 0.67%, Cr 9.55%, Mo 0.95%, V are
0.21%, W 0.95%, Nb 0.072%, N 0.45%, surplus Fe.
By calculating, Cr equivalent is 8.355 in this test.
Test two: this test is comparative test:
One, conditioning treatment: supercritical turbine heat resisting cast steel material is improved under conditions of temperature is 1070 DEG C
Keep the temperature 15h, furnace cooling；Then 50h, furnace cooling are kept the temperature under conditions of temperature is 710 DEG C；
Two, property heat treatment: supercritical turbine heat resisting cast steel material is improved under conditions of temperature is 1070 DEG C
15h is kept the temperature, sample is taken out from furnace, in air natural cooling；Then 50h is kept the temperature under conditions of temperature is 710 DEG C, with
Furnace is cooling, that is, completes heat treatment；
The supercritical turbine is as follows by the composition of mass fraction with heat resisting cast steel material: C 0.13%, Si are
0.3%, Mn 0.83%, S 0.004%, P 0.018%, Ni 0.67%, Cr 9.55%, Mo 0.95%, V are
0.21%, W 0.95%, Nb 0.072%, N 0.45%, surplus Fe.
The test of creep rupture performance is carried out to the cast steel material after two heat treatment of test one and test respectively, the results are shown in Table
1。
1 creep rupture performance test data of table
| Temperature, DEG C | Stress, MPa | Rupture time, h | |
| Test two | 670 | 98 | 108 |
| Test one | 670 | 98 | 458 |
From table 1 it follows that the heat treatment process of test one is easier than test two, and creep rupture performance is big
Amplitude improves.
Test three: this test is a kind of heat treatment side for improving supercritical turbine heat resisting cast steel material creep rupture strength
Method, specifically:
One, it conditioning treatment: improves supercritical turbine and is protected under conditions of temperature is 770 DEG C with heat resisting cast steel material
Warm 12h, furnace cooling；
Two, property heat treatment: supercritical turbine heat resisting cast steel material is improved under conditions of temperature is 1110 DEG C
1h/25mm is kept the temperature, it is then oily cold, 1h/25mm is kept the temperature under conditions of temperature is 730 DEG C, sample is taken out from furnace, in air
Middle natural cooling completes heat treatment；
The supercritical turbine is as follows by the composition of mass fraction with heat resisting cast steel material: C 0.13%, Si are
0.41%, Mn 0.77%, S 0.006%, P 0.019%, Ni 0.75%, Cr 9.52%%, Mo 0.98%, V
For 0.2%, W 0.99%, Nb 0.061%, N 0.48%, surplus Fe.
By calculating, Cr equivalent is 8.71 in this test.
Test four: this test is comparative test:
One, conditioning treatment: supercritical turbine heat resisting cast steel material is improved under conditions of temperature is 1070 DEG C
Keep the temperature 15h, furnace cooling；Then 50h, furnace cooling are kept the temperature under conditions of temperature is 710 DEG C；
Two, property heat treatment: supercritical turbine heat resisting cast steel material is improved under conditions of temperature is 1070 DEG C
15h is kept the temperature, sample is taken out from furnace, in air natural cooling；Then 50h is kept the temperature under conditions of temperature is 710 DEG C, with
Furnace is cooling, that is, completes heat treatment；
The supercritical turbine is as follows by the composition of mass fraction with heat resisting cast steel material: C 0.13%, Si are
0.41%, Mn 0.77%, S 0.006%, P 0.019%, Ni 0.75%, Cr 9.52%%, Mo 0.98%, V
For 0.2%, W 0.99%, Nb 0.061%, N 0.48%, surplus Fe.
The test of creep rupture performance is carried out to the cast steel material after four heat treatment of test three and test respectively, the results are shown in Table
2。
2 creep rupture performance test data of table
| Temperature, DEG C | Stress, MPa | Rupture time, h | |
| Test four | 670 | 98 | 113 |
| Test three | 670 | 98 | 464 |
From Table 2, it can be seen that the heat treatment process of test three is easier than test four, and creep rupture performance is big
Amplitude improves.
Claims (5)
1. a kind of heat treatment method for improving supercritical turbine heat resisting cast steel material creep rupture strength, it is characterised in that improve
The heat treatment method of supercritical turbine heat resisting cast steel material creep rupture strength are as follows:
One, conditioning treatment: the condition that supercritical turbine heat resisting cast steel material is 750 DEG C~790 DEG C in temperature is improved
Lower heat preservation 12h~15h, furnace cooling；
Two, property heat treatment: the item that supercritical turbine heat resisting cast steel material is 1090 DEG C~1130 DEG C in temperature is improved
Under part keep the temperature 1h~1.5h/25mm, it is then air-cooled or oily cold, temperature be 720 DEG C~740 DEG C under conditions of heat preservation 1h~
1.5h/25mm takes out sample, in air natural cooling from furnace, that is, completes heat treatment；
The supercritical turbine heat resisting cast steel material is as follows by the composition of mass fraction: C is 0.12%~0.14%,
It is 0.6%~1%, S be 0.001%~0.008%, P is that 0.015%~0.02%, Ni is that Si, which is 0.3%~0.42%, Mn,
0.6%~0.75%, Cr be 9.2%~9.7%, Mo be 0.95%~1%, V be 0.2%~0.22%, W be 0.95%~
1%, Nb are that 0.05%~0.08%, N is 0.045%~0.06%, surplus Fe.
2. a kind of heat treatment for improving supercritical turbine heat resisting cast steel material creep rupture strength according to claim 1
Method, it is characterised in that keep the temperature 12h, furnace cooling under conditions of temperature is 770 DEG C in step 1.
3. a kind of heat treatment for improving supercritical turbine heat resisting cast steel material creep rupture strength according to claim 1
Method, it is characterised in that 1h/25mm is kept the temperature under conditions of temperature is 1110 DEG C in step 2, it is then air-cooled or oily cold, in temperature
Degree keeps the temperature 1h/25mm under conditions of being 730 DEG C, sample is taken out from furnace, in air natural cooling, that is, completes heat treatment.
4. a kind of heat treatment for improving supercritical turbine heat resisting cast steel material creep rupture strength according to claim 1
Method, it is characterised in that the supercritical turbine is as follows by the composition of mass fraction with heat resisting cast steel material: C is
0.13%, Si 0.3%, Mn 0.83%, S 0.004%, P 0.018%, Ni 0.67%, Cr 9.55%, Mo are
0.95%, V 0.21%, W 0.95%, Nb 0.072%, N 0.45%, surplus Fe.
5. a kind of heat treatment for improving supercritical turbine heat resisting cast steel material creep rupture strength according to claim 1
Method, it is characterised in that the supercritical turbine is as follows by the composition of mass fraction with heat resisting cast steel material: C is
0.13%, Si 0.41%, Mn 0.77%, S 0.006%, P 0.019%, Ni 0.75%, Cr 9.52%%, Mo
For 0.98%, V 0.2%, W 0.99%, Nb 0.061%, N 0.48%, surplus Fe.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114657449A (en) * | 2022-03-28 | 2022-06-24 | 江苏万恒铸业有限公司 | Manufacturing method of ZG13Cr10Ni Mo1W1VNbN |
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Effective date of registration: 20221226 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN TURBINE Co.,Ltd. Patentee after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Patentee before: HARBIN TURBINE Co.,Ltd. |