CN105969949A - 18CrNiMo7-6 gear shaft forging preheating isothermal annealing process - Google Patents
18CrNiMo7-6 gear shaft forging preheating isothermal annealing process Download PDFInfo
- Publication number
- CN105969949A CN105969949A CN201610390732.5A CN201610390732A CN105969949A CN 105969949 A CN105969949 A CN 105969949A CN 201610390732 A CN201610390732 A CN 201610390732A CN 105969949 A CN105969949 A CN 105969949A
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- CN
- China
- Prior art keywords
- forging
- 18crnimo7
- heat treatment
- gear shaft
- isothermal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
-
- 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
- C21D2211/005—Ferrite
-
- 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 provides an 18CrNiMo7-6 gear shaft forging preheating isothermal annealing process, and belongs to the field of heat treatment of metal materials. The process comprises the following steps: (a) preheating: an 18CrNiMo7-6 wind power gear shaft forging is preheated to 930-950 DEG C at a heating speed of lower than 150 DEG C/h by a trolley type heat treatment furnace; (b) insulation: the insulation time of 930-950 DEG C is calculated according to the section size of 1.5 min/mm of the forging; a furnace door is opened after insulation, and a trolley is driven out; and after the surface of the forging is cooled to 600-650 DEG C, the trolley is driven in, the door is closed, and the forging is heated to 750 DEG C for insulation by 1 hour; and (c) cooling: the forging is cooled to 550 DEG C at a speed of lower than 10 DEG C/h in the furnace, and is discharged from the furnace for air cooling. The 18CrNiMo7-6 gear shaft forging preheating isothermal annealing process, provided by the invention, can enable a preheated ferrite-pearlite metallographic structure to satisfy the microscope structure requirements needed by the 18CrNiMo7-6 gear shaft forging.
Description
Technical field
The present invention relates to metal material Field of Heat-treatment, particularly relate to a kind of 18CrNiMo7-6
Gear shaft forging the pre-heat treatment isothermal annealed processes.
Background technology
Gear shaft forging, is the main member of wind power generation gear case, and technology requires higher.
Wherein conventional gear shaft forging material is 18CrNiMo7-6.18CrNiMo7-6 is Germany's board
Number, the former trade mark is 17CrNiMo6, along with decelerator machinery industry and wind-powered electricity generation industry, high ferro row
The fast development of industry, 18CrNiMo7-6 is as gear or the leading application material of gear shaft key component
Material, for guaranteeing that the high efficiency of its product, safety run, technology requires as gold after the pre-heat treatment
Phase constitution is ferrite+pearlite.
Conventional the pre-heat treatment technique is normalizing+tempering, or isothermal normalizing, but for
18CrNiMo7-6 material, the metallographic structure after normalizing+tempering is bainite tempered structure.Deng
Temperature normalizing is by workpiece heat to austenitizing temperature, keeps certain time, subsequently with certain
Mode is cooled to isothermal temperature, and keeps certain time to make it complete ferrite+pearlite or pearl
Body of light phase transformation, the technical process of air cooling of then coming out of the stove.Isothermal normalizing needs isothermal tens hours
Rear air cooling, just can obtain ferrite+pearlite, if isothermal time is not enough, although major part gold
Phase constitution is ferrite+pearlite, also has a small amount of non-equilibrium microstructure bainite and is formed.Often
The pre-heat treatment technique normalizing+tempering of rule, or isothermal normalizing is all not easy to realize technology requirement
The metallographic structure of the ferrite+pearlite obtained.
Summary of the invention
It is an object of the present invention to provide at a kind of 18CrNiMo7-6 gear shaft forging preheating
Reason isothermal annealed processes, it is possible to obtain ferrite+pearlite metallographic structure after making the pre-heat treatment,
Meet the microstructural requirements of 18CrNiMo7-6 gear shaft forging needs.
Especially, the invention provides a kind of 18CrNiMo7-6 gear shaft forging the pre-heat treatment
Isothermal annealed processes, comprises the following steps:
A, preheating process, by 18CrNiMo7-6 wind power gear forging, the pre-heat treatment is selected
Car-type heat treating furnace, is heated to 930～950 DEG C with the firing rate less than 150 DEG C/h；
B, isothermal holding, by calculating 930～950 DEG C of guarantors of forging sectional dimension 1.5min/mm
The temperature time, insulation end is opened fire door, is outputed by chassis；Treat that forging surface is cooled to
600～650 DEG C, chassis left into and closes the door, being heated to 750 DEG C and be incubated 1 hour；
C, cooling process, and are as cold as 550 DEG C of air coolings of coming out of the stove with the speed stove less than 10 DEG C/h.
Further, with the maximum cross-section chi according to described wind power gear forging in described step b
Very little calculating temperature retention time.
Further, described step c uses the heating power of control heating furnace so that lowering the temperature
Speed is less than 10 DEG C/h.
Further, described step c use control the door opened of heating furnace be sized such that
Cooling rate is less than 10 DEG C/h.
Further, the 18CrNiMo7-6 gear shaft that described isothermal annealed processes obtains after processing
Metallographic structure be ferrite+pearlite.
A kind of 18CrNiMo7-6 gear shaft forging the pre-heat treatment isothermal annealing that the present invention provides
Technique, by preheating the processing steps such as process, isothermal holding, cooling process, will
18CrNiMo7-6 wind power gear forging, the pre-heat treatment selects car-type heat treating furnace, to be less than
The firing rate of 150 DEG C/h is heated to 930～950 DEG C；By forging sectional dimension 1.5min/mm
Calculating 930～950 DEG C of temperature retention times, insulation end open fire door, chassis is outputed, waits to forge
Part surface is cooled to 600～650 DEG C, is opened into by chassis and closes the door；It is heated to 750 DEG C of insulations 1
Hour, it is as cold as 550 DEG C of air coolings of coming out of the stove with the speed stove less than 10 DEG C/h.Finally make at preheating
Obtain ferrite+pearlite metallographic structure after reason, meet 18CrNiMo7-6 gear shaft forging need
The microstructural requirements wanted.
Accompanying drawing explanation
Describe the present invention's the most by way of example, and not by way of limitation in detail
Some specific embodiments.Reference identical in accompanying drawing denote same or similar parts or
Part.It should be appreciated by those skilled in the art that what these accompanying drawings were not necessarily drawn to scale.Attached
In figure:
Fig. 1 is a kind of according to an embodiment of the invention 18CrNiMo7-6 gear shaft forging
The schematic flow sheet of the pre-heat treatment isothermal annealed processes.
Detailed description of the invention
For 18CrNiMo7-6 steel, the difficult point processing annealing process is i.e. to ensure to obtain
F+P (F is ferrite, and P is pearlite), the most also must assure that have dehydrogenation function；
The difficult point of Design of Chemical Composition is grain size to be ensured and grain size durability, the most also wants
Must assure that narrow hardenability band, and grain size and grain size durability additionally depend on final forging temperature
Control.
Fig. 1 is a kind of according to an embodiment of the invention 18CrNiMo7-6 gear shaft forging
The schematic flow sheet of the pre-heat treatment isothermal annealed processes.As it is shown in figure 1, the invention provides one
Plant 18CrNiMo7-6 gear shaft forging the pre-heat treatment isothermal annealed processes, comprise the following steps:
A, preheating process, by 18CrNiMo7-6 wind power gear forging shaft, the pre-heat treatment is selected
With car-type heat treating furnace, it is heated to 930～950 DEG C with the firing rate less than 150 DEG C/h；
B, isothermal holding, by calculating 930～950 DEG C of guarantors of forging sectional dimension 1.5min/mm
The temperature time, insulation end is opened fire door, is outputed by chassis；Treat that forging surface is cooled to
600～650 DEG C, chassis left into and closes the door, being heated to 750 DEG C and be incubated 1 hour；
C, cooling process, and are as cold as 550 DEG C of air coolings of coming out of the stove with the speed stove less than 10 DEG C/h.
Specifically, in stepb in terms of the largest cross-sectional sized according to described wind power gear forging
Calculating temperature retention time, the largest cross-sectional sized of the most described wind power gear forging obtains result divided by 1.5
Being the times needing 930～950 DEG C of insulations, unit is minute.
In a specific embodiment, use control heating furnace in step c adds hot merit
Rate is so that cooling rate is less than 10 DEG C/h.It is because completely closing car-type heat treating furnace
Time, its descent of temperature speed is more than 10 DEG C/h, is unsatisfactory for the technological requirement of the present invention, permissible
Suitably unlatching car-type heat treating furnace is with appropriate heating rate, little to control cooling rate
In 10 DEG C/h.
In another particular embodiment of the invention, described step c uses the stove of control heating furnace
Door is opened and is sized such that cooling rate is less than 10 DEG C/h.In fact because completely closing car-type
During heat-treatment furnace, its descent of temperature speed is far smaller than 10 DEG C/h, although meet the present invention's
Technological requirement, but required temperature fall time is long, can suitably open car-type heat treating furnace
Fire door, to a certain degree, increases air circulation, to control cooling rate less than 10 DEG C/h.
Further, the isothermal annealed processes through the present invention obtains after processing
The metallographic structure of 18CrNiMo7-6 gear shaft is ferrite+pearlite.
A kind of 18CrNiMo7-6 gear shaft forging the pre-heat treatment isothermal annealing that the present invention provides
Technique, by preheating the processing steps such as process, isothermal holding, cooling process, will
18CrNiMo7-6 wind power gear forging, the pre-heat treatment selects car-type heat treating furnace, to be less than
The firing rate of 150 DEG C/h is heated to 930～950 DEG C；By forging sectional dimension 1.5min/mm
Calculating 930～950 DEG C of temperature retention times, insulation end open fire door, chassis is outputed, waits to forge
Part surface is cooled to 600～650 DEG C, is opened into by chassis and closes the door；It is heated to 750 DEG C of insulations 1
Hour, it is as cold as 550 DEG C of air coolings of coming out of the stove with the speed stove less than 10 DEG C/h.Finally make at preheating
Obtain ferrite+pearlite metallographic structure after reason, meet 18CrNiMo7-6 gear shaft forging need
The microstructural requirements wanted.
In a specific embodiment, it is forged to 18CrNiMo7-6 wind power gear axle
Example, including following operation:
(1) by 18CrNiMo7-6 wind power gear forging, the pre-heat treatment is selected at car-type heat
Reason stove, is heated to 930～950 DEG C with the firing rate less than 150 DEG C/h；
(2) calculating 930 of forging sectional dimension 1.5min/mm～950 DEG C of temperature retention times are pressed,
Fire door is opened in insulation end, is outputed by chassis, treats that forging surface is cooled to 600～650 DEG C, will
Chassis leaves into and closes the door；
(3) it is heated to 750 DEG C and is incubated 1 hour, be as cold as with the speed stove less than 10 DEG C/h
550 DEG C of air coolings of coming out of the stove.
Use this technique, 18CrNiMo7-6 gear forgings can be efficiently controlled at preheating
Produce bainite structure during reason, obtain ferrite+pearlite metallographic structure, meet
The technology requirement of 18CrNiMo7-6 wind power gear axle.
So far, although those skilled in the art will appreciate that the most detailed illustrate and describing
The exemplary embodiment of the present invention, but, without departing from the spirit and scope of the present invention,
Still can directly determine according to present disclosure or derive and meet being permitted of the principle of the invention
Other variations or modifications many.Therefore, the scope of the present invention is it is understood that and regard as covering institute
There are these other variations or modifications.
Claims (5)
1. a 18CrNiMo7-6 gear shaft forging the pre-heat treatment isothermal annealed processes, its
It is characterised by, comprises the following steps:
A, preheating process, by 18CrNiMo7-6 wind power gear forging, the pre-heat treatment is selected
Car-type heat treating furnace, is heated to 930～950 DEG C with the firing rate less than 150 DEG C/h；
B, isothermal holding, by calculating 930～950 DEG C of guarantors of forging sectional dimension 1.5min/mm
The temperature time, insulation end is opened fire door, is outputed by chassis；Treat that forging surface is cooled to
600～650 DEG C, chassis left into and closes the door, being heated to 750 DEG C and be incubated 1 hour；
C, cooling process, and are as cold as 550 DEG C of air coolings of coming out of the stove with the speed stove less than 10 DEG C/h.
The pre-heat treatment isothermal annealed processes the most according to claim 1, it is characterised in that
When described step b calculates insulation with the largest cross-sectional sized according to described wind power gear forging
Between.
The pre-heat treatment isothermal annealed processes the most according to claim 1 and 2, its feature
It is, described step c uses the heating power controlling heating furnace so that cooling rate is less than
10℃/h。
The pre-heat treatment isothermal annealed processes the most according to claim 1 and 2, its feature exists
In, described step c use control the door opened of heating furnace be sized such that cooling rate is little
In 10 DEG C/h.
5. according to the pre-heat treatment isothermal annealed processes according to any one of claim 1-4, its
It is characterised by, the gold of the 18CrNiMo7-6 gear shaft that described isothermal annealed processes obtains after processing
Phase constitution is ferrite+pearlite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610390732.5A CN105969949B (en) | 2016-06-02 | 2016-06-02 | 18CrNiMo7-6 gear forging shaft the pre-heat treatment isothermal annealed processes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610390732.5A CN105969949B (en) | 2016-06-02 | 2016-06-02 | 18CrNiMo7-6 gear forging shaft the pre-heat treatment isothermal annealed processes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105969949A true CN105969949A (en) | 2016-09-28 |
| CN105969949B CN105969949B (en) | 2018-09-14 |
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|---|---|---|---|
| CN201610390732.5A Active CN105969949B (en) | 2016-06-02 | 2016-06-02 | 18CrNiMo7-6 gear forging shaft the pre-heat treatment isothermal annealed processes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111518996A (en) * | 2020-04-15 | 2020-08-11 | 大冶特殊钢有限公司 | Heat treatment method of 18CrNiMo7-6 steel |
| CN114410947A (en) * | 2022-01-26 | 2022-04-29 | 马鞍山钢铁股份有限公司 | Efficient heat treatment process for carburized driven gear blank for railway locomotive |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11236644A (en) * | 1998-02-24 | 1999-08-31 | Nippon Steel Corp | Steel for induction hardening excellent in high strength characteristic and low heat treating strain characteristic and its production |
| CN101487077A (en) * | 2009-03-04 | 2009-07-22 | 江苏金源锻造股份有限公司 | Isothermal normalizing method for alloy carburizing steel gear and forging shaft for wind power generator |
| CN101704135A (en) * | 2009-11-20 | 2010-05-12 | 株洲齿轮有限责任公司 | Dry gear cutting technology of helical bevel gear |
| CN102424934A (en) * | 2011-11-16 | 2012-04-25 | 东北特殊钢集团有限责任公司 | Manufacturing method of steel forged component of 18CrNiMo7-6 large gear |
| CN102560039A (en) * | 2010-12-07 | 2012-07-11 | 机械科学研究总院先进制造技术研究中心 | After-forging preheat treatment process of large turbine low-pressure rotor forging piece |
| CN102586583A (en) * | 2012-03-20 | 2012-07-18 | 中国重汽集团济南动力有限公司 | Heat treatment process for free forging die for medium carbon steel |
| CN102605159A (en) * | 2012-03-01 | 2012-07-25 | 湖北神力锻造有限责任公司 | Waste heat temperature control quenching process method for front axle of large-scale vehicle |
| CN103589843A (en) * | 2013-11-21 | 2014-02-19 | 上海大学 | On-line control method of banded structure and hardness of gear steel and post-rolling on-line controlled cooling bed device |
-
2016
- 2016-06-02 CN CN201610390732.5A patent/CN105969949B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11236644A (en) * | 1998-02-24 | 1999-08-31 | Nippon Steel Corp | Steel for induction hardening excellent in high strength characteristic and low heat treating strain characteristic and its production |
| CN101487077A (en) * | 2009-03-04 | 2009-07-22 | 江苏金源锻造股份有限公司 | Isothermal normalizing method for alloy carburizing steel gear and forging shaft for wind power generator |
| CN101704135A (en) * | 2009-11-20 | 2010-05-12 | 株洲齿轮有限责任公司 | Dry gear cutting technology of helical bevel gear |
| CN102560039A (en) * | 2010-12-07 | 2012-07-11 | 机械科学研究总院先进制造技术研究中心 | After-forging preheat treatment process of large turbine low-pressure rotor forging piece |
| CN102424934A (en) * | 2011-11-16 | 2012-04-25 | 东北特殊钢集团有限责任公司 | Manufacturing method of steel forged component of 18CrNiMo7-6 large gear |
| CN102605159A (en) * | 2012-03-01 | 2012-07-25 | 湖北神力锻造有限责任公司 | Waste heat temperature control quenching process method for front axle of large-scale vehicle |
| CN102586583A (en) * | 2012-03-20 | 2012-07-18 | 中国重汽集团济南动力有限公司 | Heat treatment process for free forging die for medium carbon steel |
| CN103589843A (en) * | 2013-11-21 | 2014-02-19 | 上海大学 | On-line control method of banded structure and hardness of gear steel and post-rolling on-line controlled cooling bed device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111518996A (en) * | 2020-04-15 | 2020-08-11 | 大冶特殊钢有限公司 | Heat treatment method of 18CrNiMo7-6 steel |
| CN114410947A (en) * | 2022-01-26 | 2022-04-29 | 马鞍山钢铁股份有限公司 | Efficient heat treatment process for carburized driven gear blank for railway locomotive |
| CN114410947B (en) * | 2022-01-26 | 2024-01-16 | 马鞍山钢铁股份有限公司 | Efficient heat treatment process for carburized driven gear blank for railway locomotive |
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| CN105969949B (en) | 2018-09-14 |
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