CN107400761A - The heat treatment method of advanced ultra supercritical rotor forging - Google Patents
The heat treatment method of advanced ultra supercritical rotor forging Download PDFInfo
- Publication number
- CN107400761A CN107400761A CN201610341760.8A CN201610341760A CN107400761A CN 107400761 A CN107400761 A CN 107400761A CN 201610341760 A CN201610341760 A CN 201610341760A CN 107400761 A CN107400761 A CN 107400761A
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- forging
- heat treatment
- furnace
- cooled
- stove
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Classifications
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D2211/009—Pearlite
Abstract
The invention discloses a kind of heat treatment method of the advanced ultra supercritical rotor forging of COST FB2 steels, for carrying out crystal grain refinement heat treatment to the advanced ultra supercritical rotor forging of COST FB2 steels, comprises the following steps：The first step, austenitizing processing；Second step, it is furnace-cooled to balance change temperature and carries out isothermal processes；3rd step, speed limit, which is furnace-cooled to, comes out of the stove.The present invention directly enters stove progress influence of high austenizing temp processing after making forging process for fuel, makes full use of waste heat after forging, the heat time is short, and austenitizing effect is good, can make even tissue inside and outside forging.Invention can obtain pearlite type balance change tissue, crystal grain thinning degree, cut off original thick Structure Inheritance after equilibrium temperature isothermal transformation processing.Subsequent speed limit stove is cold, can avoid the excessive internal stress of rotor forging and produce cracking.
Description
Technical field
The present invention relates to a kind of heat treatment method of forging, and in particular to a kind of advanced ultra supercritical rotor forging of COST-FB2 steels
Heat treatment method.
Background technology
Ultra supercritical coal-fired unit is current advanced generation technology ripe in the world, has significant efficient, energy-conservation and environmental protection excellent
Gesture, current developed country all competitively use and developed this new technology.Chinese clean coal generation technology is also with Development of Ultra-Supercritical fire
Group of motors is Main way, while it is also to solve electricity shortage, improve energy utilization rate and curb environmental pollution to develop the technology
The most real and effective approach of problem.The advanced ultra supercritical rotor forging of COST-FB2 steels surpasses for 625 DEG C of double reheats
Supercritical thermal power unit.
COST-FB2 steel belongs to 9wt%~10wt%Cr Ascalloys, have alloying element species is more, alloy content height and
The good feature of quenching degree.But heavy forging Structure Inheritance is serious made of the steel grade, crystal grain need to be carried out to rotor forging after forging
Refinement is heat-treated to meet forging detection and requirement.
Existing crystal grain refinement heat-treatment technology method has：(1) critical zone is quickly heated, and obtains spherical austenite；(2) repeatedly
Austenitizing recrystallizes normalized treatment.But by COST-FB2 steel forgings advanced ultra supercritical rotor forging section is big, tonnage
Greatly, need to control its heating and cooling velocity in heat treatment process, to avoid internal stress in heat treatment process excessive and cracked,
Therefore can not quickly be heated by existing critical zone to control the grain size of forging.
In addition, COST-FB2 steel rotor forging Structure Inheritances are serious, normalized treatment is recrystallized using existing repeatedly austenitizing,
The original thick tissue of meeting heredity after one side normalized treatment, can not effective crystal grain thinning；On the other hand, meeting in normalizing cooling procedure
Greatly tissue and thermal stress superposition are produced, easily causes forging cracking.Therefore, above two prior heat treatment process method without
Method meets COST-FB2 steel forgings crystal grain refinement heat treatment requirements.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of heat treatment of the advanced ultra supercritical rotor forging of COST-FB2 steels
Method, it can make rotor forging obtain preferable grain refining effect in the case of not easy to crack.
In order to solve the above technical problems, the technology of the heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steels of the present invention
Solution is to comprise the following steps：
The first step, austenitizing processing；
It is 850 ± 10 DEG C of stove to be expected that the forging for forging completion is directly inserted into temperature, 1070 are warming up to≤30 DEG C/h speed~
1100 DEG C of progress soaking isothermal holdings, realize that influence of high austenizing temp is handled；The soaking time of soaking isothermal holding be 1.5~
2.0h/100mm。
Second step, it is furnace-cooled to balance change temperature and carries out isothermal processes；
Rotor forging is furnace-cooled to 700~780 DEG C of balance change temperature and carries out isothermal structural transformation, and soaking time is at least 300h；
3rd step, speed limit, which is furnace-cooled to, comes out of the stove；
After isothermal structural transformation terminates, it is furnace-cooled to≤200 DEG C with≤8 DEG C/h speed limits and comes out of the stove, completes crystal grain refinement heat treatment.
What the present invention can reach has the technical effect that：
The present invention, which makes directly to enter stove after forging process for fuel, carries out influence of high austenizing temp processing, makes full use of waste heat after forging, during heating
Between it is short, austenitizing effect is good, can make even tissue inside and outside forging.Invention, can after equilibrium temperature isothermal transformation processing
Pearlite type balance change tissue is obtained, crystal grain thinning degree, cuts off original thick Structure Inheritance.Subsequent speed limit stove is cold, can avoid
The excessive internal stress of rotor forging and produce cracking.
The present invention is simple to operate, and cost reduces, and energy resource consumption is few, disclosure satisfy that workpiece requirement.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description：
Fig. 1 is the schematic diagram of the heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steels of the present invention.
Embodiment
As shown in figure 1, the heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steels of the present invention, for COST-FB2
The advanced ultra supercritical rotor forging of steel carries out crystal grain refinement heat treatment, comprises the following steps：
The first step, austenitizing processing；
After forging process for fuel completion, without air cooling；The forging for forging completion is directly inserted into the stove to be expected that temperature is 850 ± 10 DEG C,
With≤30 DEG C/h speed be warming up to 1070~1100 DEG C progress soaking isothermal holdings, soaking time be 1.5~2.0h/100mm (i.e.
Forging is incubated 1.5~2.0 hours per 100mm net sectional areas, if net sectional area is 1000mm forging, need to be incubated 15~20
Hour), realize that influence of high austenizing temp is handled, to eliminate forging stress, simultaneously uniform formation is good to obtain for adjustment forging grain size
Matrix；
Second step, it is furnace-cooled to balance change temperature and carries out isothermal processes；
Rotor forging is furnace-cooled to 700~780 DEG C of balance change temperature and carries out isothermal structural transformation, and soaking time is at least 300h, with
Obtain and change complete pearlite type balance change tissue, crystal grain thinning degree, cut off original thick Structure Inheritance；
3rd step, speed limit, which is furnace-cooled to, comes out of the stove；
After isothermal structural transformation terminates, it is furnace-cooled to≤200 DEG C with≤8 DEG C/h speed limits and comes out of the stove, completes crystal grain refinement heat treatment.
The present invention makes COST-FB2 steel grades held for some time at 1070~1100 DEG C, and crystal grain will not drastically grow up；The present invention
Consider COST-FB2 Steel material characteristics, the factor such as forging final forging temperature and effective cross-section size, determine COST-FB2 steel forgings
Part crystal grain refinement heat treatment process parameter.
The present invention abandons critical zone and quickly heated, and obtains spherical austenite and multiple austenitizing recrystallization two kinds of tradition of normalized treatment
Crystal grain refinement heat-treatment technology method, employ austenite Homogenization Treatments add isothermal processes obtain balance change tissue method
To refine COST-FB2 steel forgings coarse grains.
The present invention makes full use of waste heat after forging, can not only save the energy, and forging can be made to reach austenitizing guarantor in the short period
Temperature, adjustment forging grain size and homogeneous wrought tissue, good basic organization is provided for follow-up isothermal transformation.Isothermal processes
After can obtain the complete pearlite type balance change tissue of transformation, crystal grain thinning degree, cut off original thick Structure Inheritance, improve and turn
Sub- forging ultrasonic flaw detection detection sensitivity, good basic organization is provided for lower step property heat treatment.It is simultaneously subsequent
Speed limit cooling can reduce forging internal stress, avoid forging cracking.
Claims (2)
- A kind of 1. heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steels, for first to COST-FB2 steels Enter ultra supercritical rotor forging and carry out crystal grain refinement heat treatment, it is characterised in that comprise the following steps：The first step, austenitizing processing；It is 850 ± 10 DEG C of stove to be expected that the forging for forging completion is directly inserted into temperature, 1070 are warming up to≤30 DEG C/h speed~ 1100 DEG C of progress soaking isothermal holdings, realize that influence of high austenizing temp is handled；Second step, it is furnace-cooled to balance change temperature and carries out isothermal processes；Rotor forging is furnace-cooled to 700~780 DEG C of balance change temperature and carries out isothermal structural transformation, and soaking time is at least 300h；3rd step, speed limit, which is furnace-cooled to, comes out of the stove；After isothermal structural transformation terminates, it is furnace-cooled to≤200 DEG C with≤8 DEG C/h speed limits and comes out of the stove, completes crystal grain refinement heat treatment.
- 2. the heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steels according to claim 1, its feature It is, the soaking time of soaking isothermal holding is 1.5~2.0h/100mm in the first step.
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| CN201610341760.8A CN107400761B (en) | 2016-05-20 | 2016-05-20 | The heat treatment method of advanced ultra supercritical rotor forging |
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| CN201610341760.8A CN107400761B (en) | 2016-05-20 | 2016-05-20 | The heat treatment method of advanced ultra supercritical rotor forging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109402365A (en) * | 2018-12-21 | 2019-03-01 | 扬州龙川钢管有限公司 | A kind of conditioning treatment process solving T/P91, T/P92 mixed grain structure |
| CN113667807A (en) * | 2020-05-15 | 2021-11-19 | 上海电气电站设备有限公司 | Heat-resistant steel, heat treatment method and application |
| CN114875214A (en) * | 2022-06-01 | 2022-08-09 | 东北大学 | Heat treatment method of COST-FB2 steel large forging |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5716468A (en) * | 1994-12-26 | 1998-02-10 | The Japan Steel Works, Ltd. | Process for producing high-and low-pressure integral-type turbine rotor |
| CN101831535A (en) * | 2009-03-12 | 2010-09-15 | 上海重型机器锻件厂 | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel |
| CN102134637A (en) * | 2011-01-18 | 2011-07-27 | 上海交通大学 | Method for refining grains of large medium high alloy steel forgings |
| CN103305673A (en) * | 2013-07-01 | 2013-09-18 | 江阴市恒业锻造有限公司 | Method for manufacturing fine-grain 35CrNi3MoV steel large forging stock |
| CN103343200A (en) * | 2013-07-01 | 2013-10-09 | 江阴市恒业锻造有限公司 | Short-process thermal treatment method of large 35CrNi3MoV steel forgings |
-
2016
- 2016-05-20 CN CN201610341760.8A patent/CN107400761B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5716468A (en) * | 1994-12-26 | 1998-02-10 | The Japan Steel Works, Ltd. | Process for producing high-and low-pressure integral-type turbine rotor |
| CN101831535A (en) * | 2009-03-12 | 2010-09-15 | 上海重型机器锻件厂 | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel |
| CN102134637A (en) * | 2011-01-18 | 2011-07-27 | 上海交通大学 | Method for refining grains of large medium high alloy steel forgings |
| CN103305673A (en) * | 2013-07-01 | 2013-09-18 | 江阴市恒业锻造有限公司 | Method for manufacturing fine-grain 35CrNi3MoV steel large forging stock |
| CN103343200A (en) * | 2013-07-01 | 2013-10-09 | 江阴市恒业锻造有限公司 | Short-process thermal treatment method of large 35CrNi3MoV steel forgings |
Non-Patent Citations (2)
| Title |
|---|
| 刘志祥: "12%Cr超超临界转子钢热处理基础研究与工艺模拟", 《中国优秀硕士学问论文全文数据库 工程科技I辑》 * |
| 王晓芳: "620℃汽轮机转子锻件用钢晶粒细化热处理工艺研究", 《大型铸锻件》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109402365A (en) * | 2018-12-21 | 2019-03-01 | 扬州龙川钢管有限公司 | A kind of conditioning treatment process solving T/P91, T/P92 mixed grain structure |
| CN113667807A (en) * | 2020-05-15 | 2021-11-19 | 上海电气电站设备有限公司 | Heat-resistant steel, heat treatment method and application |
| CN114875214A (en) * | 2022-06-01 | 2022-08-09 | 东北大学 | Heat treatment method of COST-FB2 steel large forging |
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| CN107400761B (en) | 2019-02-12 |
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