CN106119469B - A kind of Technology for Heating Processing of large forgings crystal grain thinning - Google Patents
A kind of Technology for Heating Processing of large forgings crystal grain thinning Download PDFInfo
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- CN106119469B CN106119469B CN201610495564.6A CN201610495564A CN106119469B CN 106119469 B CN106119469 B CN 106119469B CN 201610495564 A CN201610495564 A CN 201610495564A CN 106119469 B CN106119469 B CN 106119469B
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- 238000005242 forging Methods 0.000 title claims abstract description 76
- 238000010438 heat treatment Methods 0.000 title claims abstract description 40
- 239000013078 crystal Substances 0.000 title claims abstract description 15
- 238000005516 engineering process Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 21
- 238000010792 warming Methods 0.000 claims description 11
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- 238000005496 tempering Methods 0.000 claims description 7
- 239000003595 mist Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 238000009659 non-destructive testing Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 3
- 235000013339 cereals Nutrition 0.000 description 6
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/28—Normalising
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention discloses a kind of Technology for Heating Processing of large forgings crystal grain thinning.The technique is directed to large-scale Hi-Stren steel forging, by implementing to be heat-treated three times to the forging of coarse grain, is effectively improved the thick tissue of forging, crystal grain thinning, the mechanical property and Non-Destructive Testing qualification rate of raising Hi-Stren steel forging.
Description
Technical field
The invention belongs to forging technical field of heat treatment, specially a kind of Technology for Heating Processing of large forgings crystal grain thinning.
Background technology
Large forgings is being forged because of the reason such as Forge Heating, forging is insufficient, forging pressure is insufficient, forging drafts deficiency
Thick crystal grain is easily formed during making, phenomena such as causing coarse grains, mixed crystal, mechanical property and following process to workpiece
Performance has undesirable effect, and serious will cause workpiece to be scrapped, and bring huge economic loss.
There is coarse grain in large forgings, is only improved by being heat-treated.The Technology for Heating Processing that prior art uses, no
Crystal grain in forging stock can be refined, can not significantly improve the mechanical property of forging.
The content of the invention
The purpose of the present invention provides a kind of heat treatment of large forgings crystal grain thinning aiming at above-mentioned defect
Technique.The technique is directed to large-scale Hi-Stren steel forging, by implementing to be heat-treated three times to the forging of coarse grain, effectively
Improve the thick tissue of forging, crystal grain thinning, the mechanical property and Non-Destructive Testing qualification rate of raising Hi-Stren steel forging.
The present invention a kind of large forgings crystal grain thinning thermal treatment process technology scheme be will be controlled behind forging stock end it is cold after,
Carry out Technology for Heating Processing three times.
A kind of Technology for Heating Processing of described large forgings crystal grain thinning, comprises the following steps：
（1）Controll cooling after forging is implemented to forging stock：Forging stock is specially air-cooled to less than 300 DEG C；
（2）The forging stock for being air-cooled to less than 300 DEG C is entered into stove, is heat-treated for the first time after being forged：Normalizing；
（3）The forging stock being heat-treated for the first time after forging is entered into stove, second is carried out and is heat-treated：Quenching；
（4）The forging stock of second of the heat treatment after forging is entered into stove, carries out third time heat treatment：Normalizing+tempering.
Normalizing is specially：After the forging stock for being air-cooled to less than 300 DEG C is entered into stove, it is warming up to≤150 DEG C/h heating rate
Complete austenitizing, recommended temperature are：Ac3+（50-100）DEG C, after being incubated the t1 times, through air-cooled+mist cooling to 300 ± 10
℃。
Ac3 is sub-eutectoid steel, i.e. phosphorus content ＜ 0.77%wt steel, starting of the ferritic transformation into austenite in heating
Temperature, it is a critical-temperature of sub-eutectoid steel.
T1=k × D, wherein, k is coefficient, value 0.8-1.5, unit：Point/millimeter；D is workpiece effective thickness, unit：In the least
Rice.
Step（3）In, quenching is specially：After the forging stock being heat-treated for the first time after forging is entered into stove, with≤150 DEG C/h's
Heating rate is warming up to complete austenitizing, and recommended temperature is：Ac3+（30-50）DEG C, it is water cooled to be cooled to after being incubated the t2 times
≤200℃。
T2=k × D, wherein, k is coefficient, value 0.8-1.5, unit：Point/millimeter；D is workpiece effective thickness, unit：In the least
Rice.
Step（4）In, normalizing and tempering is specially：After the forging stock of second of the heat treatment after forging is entered into stove, with≤150
DEG C/h heating rate is warming up to complete austenitizing, recommended temperature is：Ac3+（30-80）DEG C, after being incubated the t3 times, through air-cooled
Add mist cooling to continuation air cooling cooling after 300 ± 10 DEG C；Then from temperature≤300 DEG C with≤150 DEG C/h heating rate liter
Temperature is to 550 ± 10 DEG C, after being incubated the t4 times, air cooling cooling.
T3=k × D, t4=k × D, wherein, k is coefficient, value 0.8-1.5, unit：Point/millimeter；D is that workpiece is effectively thick
Degree, unit：Millimeter.
Beneficial effects of the present invention are：The technique is directed to large-scale Hi-Stren steel forging, by coarse grain
Forging implement be heat-treated three times, can be effectively improved large forgings because Forge Heating, forging is insufficient, forging pressure is insufficient, forge
Caused by making the reasons such as drafts deficiency phenomena such as coarse grains, mixed crystal, crystal grain thinning, improve large forgings microscopic structure and
Mechanical property, improve the Non-Destructive Testing qualification rate of Hi-Stren steel forging.
Brief description of the drawings：
Fig. 1 show the first time heat treatment normalizing process curve of the present invention；
Fig. 2 show second of heat treatment quenching process curve of the present invention；
Fig. 3 show third time heat treatment normalizing+tempering process curve of the present invention；
Fig. 4 show embodiment 1 first time heat treatment cycle curve；
Fig. 5 show second of the heat treatment cycle curve of embodiment 1；
Fig. 6 show the third time heat treatment cycle curve of embodiment 1.
Embodiment：
For a better understanding of the present invention, technical scheme is described in detail with instantiation below, but originally
Invention is not limited thereto.
Embodiment 1
The blank dimension for being Q345B to material is the Φ 700 × 350 of Φ 3500/（Unit：Millimeter）Workpiece, Φ after forging
3480/ Φ 680 × 330 forging stock is handled by implementing normalizing, quenching and normalizing and tempering after forging, and is comprised the following steps：
（1）Controll cooling after forging is implemented to forging stock：Forging stock is specially air-cooled to less than 300 DEG C；
（2）The forging stock for being air-cooled to less than 300 DEG C is entered into stove, is heat-treated for the first time after being forged：Normalizing, 300 will be air-cooled to
After forging stock below DEG C enters stove, 930 ± 10 DEG C are warming up to≤150 DEG C/h heating rate, after being incubated 7h, through air-cooled+spraying
Continue air cooling after being cooled to 300 ± 10 DEG C.See Figure of description Fig. 1.
（3）The forging stock being heat-treated for the first time after forging is entered into stove, second is carried out and is heat-treated：Quenching, will be after forging
After the forging stock of heat treatment enters stove for the first time, 900 ± 10 DEG C are warming up to≤150 DEG C/h heating rate, it is water cooled after being incubated 6h
It is cooled to≤200 DEG C.See Figure of description Fig. 2.
（4）The forging stock of second of the heat treatment after forging is entered into stove, carries out third time heat treatment：Normalizing+tempering, will be through
Cross second heat treatment after forging forging stock enter stove after, be warming up to 900 ± 10 DEG C with≤150 DEG C/h heating rate, be incubated 6.5h
Afterwards, through air-cooled plus mist cooling to continuation air cooling cooling after 300 ± 10 DEG C；Then from temperature≤300 DEG C with≤150 DEG C/h liter
Warm speed is warming up to 550 ± 10 DEG C, after being incubated 9.5h, air cooling cooling.See Figure of description Fig. 3.
Through body sampling, its tensile property and room temperature impact performance are detected, fully meets customer requirement.Body sampling, power
It is as shown in table 1 to learn results of property：
Table 1
After workpiece is rough turn, through ultrasound examination, the grass-like ripple of excessive defect and obvious coarse grains is not found, it is ultrasonic to examine
It is qualified to survey.
Claims (1)
1. a kind of Technology for Heating Processing of large forgings crystal grain thinning, it is characterised in that after forging stock controll cooling after forging, carry out hot three times
Handling process；
Comprise the following steps：
（1）Controll cooling after forging is implemented to forging stock：Forging stock is specially air-cooled to less than 300 DEG C；
（2）The forging stock for being air-cooled to less than 300 DEG C is entered into stove, is heat-treated for the first time after being forged：Normalizing；
（3）The forging stock being heat-treated for the first time after forging is entered into stove, second is carried out and is heat-treated：Quenching；
（4）The forging stock of second of the heat treatment after forging is entered into stove, carries out third time heat treatment：Normalizing+tempering；
Step（2）In, normalizing is specially：After the forging stock for being air-cooled to less than 300 DEG C is entered into stove, with≤150 DEG C/h heating rate
Complete austenitizing is warming up to, temperature is：Ac3+（50-100）DEG C, after being incubated the t1 times, through air-cooled+mist cooling to 300 ±
10℃；T1=k × D, wherein, k is coefficient, value 0.8-1.5, unit：Point/millimeter；D is workpiece effective thickness, unit：Millimeter；
Step（3）In, quenching is specially：After the forging stock being heat-treated for the first time after forging is entered into stove, with≤150 DEG C/h heating
Speed is warming up to complete austenitizing, and temperature is：Ac3+（30-50）DEG C, it is water cooled to be cooled to≤200 DEG C after being incubated the t2 times；
T2=k × D, wherein, k is coefficient, value 0.8-1.5, unit：Point/millimeter；D is workpiece effective thickness, unit：Millimeter；
Step（4）In, normalizing and tempering is specially：After the forging stock of second of the heat treatment after forging is entered into stove, then with≤150
DEG C/h heating rate is warming up to complete austenitizing, temperature is：Ac3+（30-80）DEG C, after being incubated the t3 times, through air-cooled plus spray
Mist continues air cooling cooling after being cooled to 300 ± 10 DEG C；Then it is warming up to from temperature≤300 DEG C with≤150 DEG C/h heating rate
550 ± 10 DEG C, after being incubated the t4 times, air cooling cooling；T3=k × D, t4=k × D, wherein, k is coefficient, and value 0.8-1.5 is single
Position：Point/millimeter；D is workpiece effective thickness, unit：Millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610495564.6A CN106119469B (en) | 2016-06-30 | 2016-06-30 | A kind of Technology for Heating Processing of large forgings crystal grain thinning |
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| CN106119469A CN106119469A (en) | 2016-11-16 |
| CN106119469B true CN106119469B (en) | 2018-02-06 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107557540B (en) * | 2017-10-30 | 2018-11-06 | 山东伊莱特重工股份有限公司 | A kind of cold normalizing method of control of A105 forging |
| CN110527796A (en) * | 2019-08-26 | 2019-12-03 | 张家港广大特材股份有限公司 | A method of passing through Heat Treatment Control high temperature alloy forging grain size |
| CN110484703B (en) * | 2019-08-30 | 2021-04-13 | 辽宁福鞍重工股份有限公司 | Heat treatment process for refining grain size of thick large-section ultra-low carbon martensite steel casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4987263B2 (en) * | 2005-07-26 | 2012-07-25 | 三桜工業株式会社 | High strength steel pipe and heat treatment method thereof |
| CN101787419B (en) * | 2009-12-25 | 2011-06-08 | 中原特钢股份有限公司 | Heat treatment process of AISI4340 steel forgings |
| CN102134637B (en) * | 2011-01-18 | 2012-10-31 | 上海交通大学 | Grain refinement method for large forgings of medium and high alloy steel |
| CN102732697A (en) * | 2012-06-27 | 2012-10-17 | 西安航空动力股份有限公司 | Method for refining 1Cr10Co6MoVNbN stainless steel forging grains |
| CN103290192B (en) * | 2013-06-27 | 2015-05-06 | 洛阳中创重型机械有限公司 | Thermal treatment process of spliced-welding type large tube plate forging of pressure container |
| CN103305672B (en) * | 2013-06-27 | 2015-01-28 | 洛阳中创重型机械有限公司 | Heat treatment process for ultra-large type tube plate forge piece of pressure container |
| CN103436803A (en) * | 2013-08-13 | 2013-12-11 | 武汉重工铸锻有限责任公司 | Processing method for pump head body of five-cylinder plunger pump |
| CN103981347B (en) * | 2014-04-11 | 2016-08-17 | 中原特钢股份有限公司 | A kind of processing method of CrNiMoV high pressure steel forgings crystal grain refinement |
| CN103990758B (en) * | 2014-05-26 | 2016-01-13 | 无锡宏达重工股份有限公司 | A kind of 10Cr9Mo1VNb steel forgings manufacturing process |
| CN104946873A (en) * | 2015-06-18 | 2015-09-30 | 秦皇岛开发区春光铸造机械有限公司 | After-forged heat treatment technology of LZ50 steel axle |
| CN105369023A (en) * | 2015-11-02 | 2016-03-02 | 哈尔滨汽轮机厂有限责任公司 | Method for refining grains of 2Cr12NiMo1W1V forge piece |
| CN105369022B (en) * | 2015-11-02 | 2017-06-23 | 哈尔滨汽轮机厂有限责任公司 | A kind of method that 2Cr12NiMo1W1V forging carries out crystal grain refinement in process of production |
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Address after: No. 9001, Zhangqiu Ji Wang Road, Ji'nan, Shandong Province Patentee after: Elite Energy Equipment Co.,Ltd. Address before: No. 9001, Zhangqiu Ji Wang Road, Ji'nan, Shandong Province Patentee before: SHANDONG IRAETA HEAVY INDUSTRY Co.,Ltd. |
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Denomination of invention: Thermal treatment technique for grain refining of large-scale forge piece Effective date of registration: 20200702 Granted publication date: 20180206 Pledgee: Qilu bank Limited by Share Ltd. Ji'nan Zhangqiu branch Pledgor: Elite Energy Equipment Co.,Ltd. Registration number: Y2020980003711 |
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