CN107513605A - The removing method of 35CrNi3MoV steel large forgings arborescent structures based on Composition Control - Google Patents
The removing method of 35CrNi3MoV steel large forgings arborescent structures based on Composition Control Download PDFInfo
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- CN107513605A CN107513605A CN201710721722.XA CN201710721722A CN107513605A CN 107513605 A CN107513605 A CN 107513605A CN 201710721722 A CN201710721722 A CN 201710721722A CN 107513605 A CN107513605 A CN 107513605A
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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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Abstract
A kind of removing method of the 35CrNi3MoV steel large forgings arborescent structures based on Composition Control, it is characterised in that need to control the composition of 35CrNi3MoV steel be：Al element mass percentage contents are below 0.01%, and N element mass percentage content is in below 90ppm；The removing method of arborescent structure is：First, the steel ingot electroslag remelting of progress, experiment steel is then subjected to more fire time forging processing, the method that normalizing+tempering+normalizing+modifier treatment is finally carried out to forging；The method safety of the present invention is reliable, its obvious phenomenon for having cut down dendritic segregation of the forging treated by this method, the combination property of forging is improved, so as to meet China to high-strength, high-ductility, the manufacture needs of high-hardenability large forgings.
Description
Technical field
The present invention relates to a kind of large-scale steel forgings deformation technology, especially a kind of processing of 35CrNi3MoV steel large forgings
Technology, the removing method of specifically a kind of 35CrNi3MoV steel large forgings arborescent structures based on Composition Control.
Background technology
30CrNi3MoV steel has high quenching degree and good comprehensive mechanical property, can cut greatly after quenching high tempering
Uniform intensity, high plasticity, toughness, fatigue strength, low Cold Brittleness Transition Temperature and notch sensitivity are obtained on face.Without obvious
Temper brittleness, cutting ability is medium, and cold deformation plasticity and weldability are poor.Formation to white point is sensitive, slow cooling of being tried one's best after forging.Preferably
Make the larger part in section, such as axial workpiece, banjo fixing butt jointing, gear.
Large forgings must be forged by large-sized casting ingot and formed, and large-sized casting ingot certainly exists the groups such as arborescent structure in manufacturing process
Knit, the inhomogeneities of composition.To meet mechanical property, large forgings must generally use the high steel grade of quenching degree high intensity, such as：
Ni-Cr-Mo-V systems steel etc..But this kind of steel overcooling austenite stability is high, Structure Inheritance tendency is big（That is martensite, bainite etc.
The phenomenon of original coarse grain is inherited and recovered to non-equilibrium original structure in austenite again）, cause large forgings crystal grain
It is thick and uneven, and then influence the performances such as its impact flexibility, brittle transition temperature, the ultrasonic wave property visited and magnetic conductivity.
In order to solve coarse grains and the problem of non-uniform that large forgings Structure Inheritance is brought, generally use complexity is simultaneously at present
And the heat treatment after forging process that the cycle is very long（Multiple normalizing, critical zone high temperature side normalizing, annealing etc. after forging）Improve to add.But
For dendrite critical regions, more serious coarse-grain and mixed crystal phenomenon still occurs.Therefore, fundamentally to block coarse-grain and mix
Brilliant phenomenon, it is necessary to control the harmful structures such as the dendrite in large forgings.
The structure property of forging has very big relation with forging technology.Forged relative to Dan Huoci, more fire time forgings can be with
By adding pyrogenetic recrystallization, austenite phase transformation etc. to improve material structure before repeatedly forging.The size of forging ratio influences forging matter
Amount, forging ratio too small but also can not be the bigger the better, and the former can cause arborescent structure to eliminate, and the latter can cause group
Knit, performance directionality it is obvious.
From the point of view of existing result of study, relevant arborescent structure, forging structural heterogenity, heat-treated sturcture are hereditary and thick
The research of inner link between brilliant mixed crystal phenomenon, at home and abroad there is not yet open report.And developed country is high for high-hardenability
The manufacturing technology of strong steel large forgings, always to the strict block in China.In consideration of it, this project is large-scale for high-hardenability high-strength steel
The international latest development trend of forging manufacture, develops compared with existing manufacturing technology, has coarse-grain and mixed grain structure journey
Degree is lower while has the organizational controls technology of the high-hardenability high-strength steel large forgings manufacture of more Good All-around Property balance,
Entirely autonomous intellectual property is obtained, reaches and keeps the leading level in the world, promotes China in high-hardenability high-strength steel large forgings
Manufacturing field realizes great-leap-forward development.
The content of the invention
The purpose of the present invention is disclosed between arborescent structure, forging structural heterogenity, heat treatment coarse-grain mixed grain structure
Inner link, break through the arborescent structure founding control of Ni-Cr-Mo-V systems high-hardenability high-strength steel large forgings and diffusion annealing and
The key technologies such as machining control, the mixed grain structure control of heat treatment coarse-grain are forged, establish Ni-Cr-Mo-V systems high-hardenability high-strength steel
The organizational controls technology prototype of large forgings, it is the highly reliable of high-performance Ni-Cr-Mo-V systems high-hardenability high-strength steel large forgings
Short route low cost production provides technical foundation and theoretical foundation, promotes the system in China high-hardenability high-strength steel large forgings field
Technological progress is made, invents a kind of removing method of the 35CrNi3MoV steel large forgings arborescent structures based on Composition Control.
The technical scheme is that：
A kind of removing method of the 35CrNi3MoV steel large forgings arborescent structures based on Composition Control, it is characterised in that enter first
Row composition controls, and is then forged and is heat-treated to eliminate arborescent structure.Composition needs to control 35CrNi3MoV steel when controlling
Composition be：Al element mass percentage contents are below 0.01%, and N element mass percentage content is in below 90ppm；Eliminate
The method of arborescent structure is：First, the steel ingot electroslag remelting of progress, experiment steel is then subjected to more fire time forging processing, finally
The method that normalizing+tempering+normalizing+modifier treatment is carried out to forging；
Described more fire time forgings include the 2 upsetting pulls forging carried out successively, and 2 upsetting pulls forging refers to a single upsetting pull i.e. upsetting one
Pull out progress twice, the forging ratio of single upsetting pull is 2-4, total forging ratio 8 of more fire time forgings.
Described normalizing heat treatment technique is to carry out air cooling after 920 DEG C of h of ± 10 DEG C × 4h ± 0.5 are incubated.
Described tempering heat treatment process is progress oil cooling tempering after the 610 DEG C of h of ± 10 DEG C × 8h ± 0.5 insulations.
Described modifier treatment technique is to carry out oil quenchinng and 610 DEG C after 860 DEG C of h of ± 10 DEG C × 4h ± 0.5 are incubated
Oil cooling tempering is carried out after ± 10 DEG C × 8h ± 0.5 h insulations.
Beneficial effects of the present invention：
（1）The removing method of the 35CrNi3MoV steel large forgings arborescent structures based on Composition Control of the present invention, using electroslag
Remelting method can reduce nonmetal inclusion in steel, improve the hot-working character of steel, improve the processing lumber recovery of steel ingot.
（2）The removing method of the 35CrNi3MoV steel large forgings arborescent structures based on Composition Control of the present invention, a side
Face, by the recrystallization after more fire time forgings, eliminate dendritic segregation；On the other hand, the multiple of normalizing+tempering+normalizing is passed through
Heat treatment eliminates Structure Inheritance and has refined crystal grain by phase transformation.
（3）The removing method of the 35CrNi3MoV steel large forgings arborescent structures based on Composition Control of the present invention, can
Control the content of Al and N element so that the content of Al elements is less than 0.01%, and the content of N element is less than 90ppm, reduces AlN's
Generation, pinning effect is reduced, dendritic segregation element homogenization is easier, and the recrystallization ability of steel is improved, so as to effectively eliminate branch
Crystalline substance segregation.
Brief description of the drawings
Fig. 1 is that the present invention implements electroslag after electroslag remelting, more fire time forgings, normalizing+tempering+normalizing+modifier treatment process
Ingot macroetch after homogenizing annealing.
Fig. 2 is that the present invention implements forging after electroslag remelting, more fire time forgings, normalizing+tempering+normalizing+modifier treatment process
Metallographic structure electron scanning micrograph.
Fig. 3 is that the present invention implements Al members after electroslag remelting, more fire time forgings, normalizing+tempering+normalizing+modifier treatment process
The exceeded ESR ingot of element, N element macroetch after homogenizing annealing.
Fig. 4 is that the present invention implements Al members after electroslag remelting, more fire time forgings, normalizing+tempering+normalizing+modifier treatment process
The metallographic structure electron scanning micrograph of the exceeded forging of element, N element.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 1, 2.
A kind of removing method of the 35CrNi3MoV steel large forgings arborescent structures based on Composition Control, its preparation method：
First, the electroslag remelting of steel ingot is carried out successively to 35CrNi3MoV steel, the composition for controlling 35CrNi3MoV steel is：Al elements
Mass percentage content is below 0.01%, and N element mass percentage content is in below 90ppm；
Then, more fire time forgings are carried out（More fire time forgings include the 2 upsetting pulls forging carried out successively, and 2 upsetting pulls forging refers to list
Secondary upsetting pull is that a upsetting one pulls out progress twice, and the forging ratio of single upsetting pull is 2-4, total forging ratio 8 of more fire time forgings）
+ 920 DEG C × 4h of oil cooling tempering insulations are carried out after finally carrying out+610 DEG C of air cooling normalizing after 920 DEG C × 4h is incubated × 8h insulations
Air cooling normalizing+modifier treatment afterwards（Oil cooling tempering is carried out after+610 DEG C of oil quenchinng × 8h insulations are carried out after 860 DEG C × 4h insulations）；
Forging macroetch photo after above-mentioned processing（Fig. 1）With the metallographic structure using Scanning Electron microscope photographing（Fig. 2）.
It can be seen that from the metallographic structure of forging：The field trash of forging organization internal compares less, and field trash is main
For rich O, C, Fe, S, Ca and rich O, Al, Ca field trash, respectively based on iron oxide, aluminum oxide.Crystallite dimension at 10 ~ 30 μm,
Average-size is 20 μm, has refined grain structure.By the content for controlling Al and N element so that the content of Al elements is less than
0.01%, the content of N element is less than 90ppm, reduces AlN generation, when Al content is low, can reduce pinning effect, dendrite is inclined
Analysis element homogenization is easier, and the recrystallization ability of steel is improved, so as to effectively eliminate dendritic segregation.
Comparative example：
A kind of 35CrNi3MoV steel large forgings preparation method, 35CrNi3MoV composition are：Al：0.025%, N：32ppm%,
Cr：1.30%, Ni：3.07%, Mo：0.47%, V：0.16%.
Then, more fire time forgings are carried out（More fire time forgings include the 2 upsetting pulls forging carried out successively, and 2 upsetting pulls forging is
It is that a upsetting one pulls out progress twice to refer to single upsetting pull, and the forging ratio of single upsetting pull is 2-4, total forging ratio 8 of more fire time forgings）
+ 920 DEG C × 4h of oil cooling tempering insulations are carried out after finally carrying out+610 DEG C of air cooling normalizing after 920 DEG C × 4h is incubated × 8h insulations
Air cooling normalizing+modifier treatment afterwards（Oil cooling tempering is carried out after+610 DEG C of oil quenchinng × 8h insulations are carried out after 860 DEG C × 4h insulations）；
Forging macroetch photo after above-mentioned processing（Fig. 3）With the metallographic structure using Scanning Electron microscope photographing（Fig. 4）.
As can be seen from the figure after Al and N element are exceeded, it is suppressed that recrystallization, the segregation of dendrite is still very serious, shadow
The combination property of forging is rung.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.
Claims (3)
1. a kind of removing method of the 35CrNi3MoV steel large forgings arborescent structures based on Composition Control, it is characterised in that need
The composition for controlling 35CrNi3MoV steel is：Al element mass percentage contents are below 0.01%, N element mass percentage content
In below 90ppm；The removing method of arborescent structure is：First, steel ingot electroslag remelting is carried out, experiment steel is then subjected to more fire
Forging processing, the method that normalizing+tempering+normalizing+modifier treatment is finally carried out to forging；Described more fire time forgings are included successively
The 2 upsetting pulls forging carried out；Normalizing heat treatment technique is progress air cooling normalizing after the 920 DEG C of h of ± 10 DEG C × 4h ± 0.5 insulations；
Described tempering heat treatment process is progress oil cooling tempering after the 610 DEG C of h of ± 10 DEG C × 8h ± 0.5 insulations；Described quenched place
Science and engineering skill is the h insulations of ± 10 DEG C × 8h of+610 DEG C of oil quenchinng of progress ± 0.5 after the 860 DEG C of h of ± 10 DEG C × 4h ± 0.5 insulations
Oil cooling tempering is carried out afterwards.
2. according to the method for claim 1, it is characterized in that described 2 upsetting pulls forging refers to that a single upsetting pull i.e. upsetting one is pulled out
Carry out twice, the forging ratio of single upsetting pull is 2-4.
3. according to the method for claim 1, it is characterized in that total forging ratio 8 of described 2 upsetting pulls forging.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117778897A (en) * | 2024-02-28 | 2024-03-29 | 江阴方圆环锻法兰有限公司 | Production method of planet wheel forge piece with high grain size stability |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110162764A1 (en) * | 2010-01-07 | 2011-07-07 | Korea Atomic Energy Research Institute | High-cr ferritic/martensitic steel having improved creep resistance and preparation method thereof |
| 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 |
| CN105603169A (en) * | 2016-03-07 | 2016-05-25 | 江苏大学 | Short-process manufacture method for large 30CrNi2MoV steel piece |
| CN105755236A (en) * | 2016-03-07 | 2016-07-13 | 江苏大学 | Method for improving low temperature impact toughness of 35CrNi3MoV steel forgings |
-
2017
- 2017-08-22 CN CN201710721722.XA patent/CN107513605A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110162764A1 (en) * | 2010-01-07 | 2011-07-07 | Korea Atomic Energy Research Institute | High-cr ferritic/martensitic steel having improved creep resistance and preparation method thereof |
| 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 |
| CN105603169A (en) * | 2016-03-07 | 2016-05-25 | 江苏大学 | Short-process manufacture method for large 30CrNi2MoV steel piece |
| CN105755236A (en) * | 2016-03-07 | 2016-07-13 | 江苏大学 | Method for improving low temperature impact toughness of 35CrNi3MoV steel forgings |
Non-Patent Citations (2)
| Title |
|---|
| 孙文山等: "残铝在35CrNi3MoV钢中的作用", 《兵工学报》 * |
| 王邦杰: "《实用模具材料与热处理速查手册》", 31 January 2014 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117778897A (en) * | 2024-02-28 | 2024-03-29 | 江阴方圆环锻法兰有限公司 | Production method of planet wheel forge piece with high grain size stability |
| CN117778897B (en) * | 2024-02-28 | 2024-05-31 | 江阴方圆环锻法兰有限公司 | Production method of planet wheel forge piece with high grain size stability |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20190114 Address after: 214423 Shashan Avenue 527, Zhouzhuang Town, Jiangyin City, Wuxi City, Jiangsu Province Applicant after: Jiangyin Hengye Forging Co., Ltd. Address before: 212013 No. 301, Xuefu Road, Zhenjiang, Jiangsu Applicant before: Jiangsu University |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20171226 |