CN107974544A - The shaft furnace heat treatment process of cupulate forging - Google Patents
The shaft furnace heat treatment process of cupulate forging Download PDFInfo
- Publication number
- CN107974544A CN107974544A CN201711187480.7A CN201711187480A CN107974544A CN 107974544 A CN107974544 A CN 107974544A CN 201711187480 A CN201711187480 A CN 201711187480A CN 107974544 A CN107974544 A CN 107974544A
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- Prior art keywords
- forging
- temperature
- cooling
- warming
- heat treatment
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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
- 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
Abstract
The present invention relates to a kind of shaft furnace heat treatment process of the cupulate forging of 35 steel, forging total power is warming up to more than complete austenitizing temperature and is kept the temperature for 50~90 DEG C, and rapid cooling is used, when forging surface final cooling temperature terminates for 50~100 DEG C of coolings below Ms (martensite start) point；Forging total power is warming up to more than complete austenitizing temperature and is kept the temperature for 50~90 DEG C, continuous coo1ing in cooling medium is put into after insulation, cooling tube is accessed in rim of a cup inner wall in cooling procedure, cools down and terminates when wall surface final cooling temperature reaches below 100 DEG C inside and outside forging；30~70 DEG C of progress preheating insulations below Ms (martensite start) point, high tempering area is warming up to 30~60 DEG C/h to be kept the temperature, come out of the stove after insulation air-cooled, the present invention preferably resolves quality problems of the 35 steel bowl shape Forgings using cup inner wall lower hardness after normative heat treatment technique.
Description
Technical field
The invention belongs to steel material manufacturing process control field, more particularly to a kind of shaft furnace of the cupulate forging of 35 steel
Heat treatment process.
Background technology
It is for the heat treatment production method of 35 steel bowl shape Forging routines at present：By forging be vertically disposed in shaft furnace into
Row heating, forging is quickly transferred in sink after insulation and is cooled down, after be transferred to tempering furnace carry out high tempering.Press
After this technique performs, forging case hardness is qualified, but cup inner wall lower hardness.
The content of the invention
It is an object of the invention to overcome it is above-mentioned in the prior art the shortcomings that and a kind of cupulate forging for realizing 35 steel is provided
The shaft furnace heat treatment process of the uniform cupulate forging of inside and outside wall hardness.
The technical proposal of the invention is realized in this way：A kind of cupulate forging shaft furnace heat treatment process, it is characterised in that：
The technique comprises the following steps that：
Step 1）, forging total power is warming up to more than complete austenitizing temperature to 50~90 DEG C of insulations, and use rapid cooling, work as forging
Part surface final cooling temperature terminates for 50~100 DEG C of coolings below Ms (martensite start) point；
Step 2）, forging total power is warming up to more than complete austenitizing temperature to 50~90 DEG C of insulations, be put into after insulation
Continuous coo1ing in medium is cooled down, accesses cooling tube in rim of a cup inner wall in cooling procedure, wall surface final cooling temperature reaches inside and outside forging
Terminate to cooling at less than 100 DEG C；
Step 3）, below Ms (martensite start) point 30~70 DEG C progress preheating insulation, with 30~60 DEG C/h heat up it is paramount
Warm refined zone is kept the temperature, and is come out of the stove after insulation air-cooled.
The step 1）Middle forging total power is warming up to more than complete austenitizing temperature 70~90 DEG C of insulations, and using fast
Cold is that air-cooled and mist is cold.
The step 2）Middle forging total power is warming up to more than complete austenitizing temperature 60~80 DEG C of insulations, insulation and terminates
After be put into continuous coo1ing in cooling medium, cooling medium be water, and cooling medium initial temperature is 20~30 DEG C, cooling tube temperature and
It is identical to cool down medium initial temperature, cools down and terminates when wall surface final cooling temperature reaches 50~80 DEG C inside and outside forging.
The step 3）High tempering area is warming up to 40~50 DEG C/h to be kept the temperature, coming out of the stove after insulation is air-cooled to room
Temperature.
The cupulate forging is 35 steel, 35 steel be carbon mass percent be 0.34~0.36%, manganese mass percent be 0.7
~0.8% middle carbon high-quality structural steel.
The cup shell is electric furnace ingot forging.
The good effect that technical scheme produces is as follows：Forging total power is warming up to complete austenitizing temperature
50~90 DEG C of the above is kept the temperature, and improves carbon segregation, uniform formation；Using rapid cooling, it is cooled to below Ms (martensite start) point
50~100 DEG C, thick pearlite and ferrite are prevented by rapid cooling；Forging total power is warming up to complete austenitizing temperature
More than degree keep the temperature for 50~90 DEG C, continuous coo1ing in cooling medium is put into after insulation, is connect in cooling procedure in rim of a cup inner wall
Enter cooling tube, cool down and terminate when wall surface final cooling temperature reaches below 100 DEG C inside and outside forging, make inside and outside wall cooling velocity same
Step, even tissue；30~70 DEG C of progress preheating insulations below Ms (martensite start) point, are heated up paramount with 30~60 DEG C/h
Warm refined zone is kept the temperature, and is come out of the stove after insulation air-cooled, and preheating and at a slow speed heating avoid the irregular position of forging should because of heat
Power and structural stress are superimposed and crack, and it is tempered sorbite that high tempering insulation, which promotes martensite transfor mation, obtains good synthesis
Mechanical property.
Brief description of the drawings
Fig. 1 is the specific heat treatment process figure of the present invention.
Embodiment
Carry out the technical solution that the present invention is further explained below by embodiment, but protection scope of the present invention is not
It is limited to this.
A kind of cupulate forging shaft furnace heat treatment process, it is characterised in that：The technique comprises the following steps that：
Step 1：Forging total power is warming up to more than complete austenitizing temperature and is kept the temperature for 50~90 DEG C, and uses rapid cooling, when
Forging surface final cooling temperature terminates for 50~100 DEG C of coolings below Ms (martensite start) point；
Step 2：Forging total power is warming up to more than complete austenitizing temperature and is kept the temperature for 50~90 DEG C, is put into after insulation
Continuous coo1ing in medium is cooled down, accesses cooling tube in rim of a cup inner wall in cooling procedure, wall surface final cooling temperature reaches inside and outside forging
Terminate to cooling at less than 100 DEG C；
Step 3：30~70 DEG C of progress preheating insulations, high temperature is warming up to 30~60 DEG C/h below Ms (martensite start) point
Refined zone is kept the temperature, and is come out of the stove after insulation air-cooled.
Preferably, forging total power is warming up to more than complete austenitizing temperature and keeps the temperature for 70~90 DEG C in the step 1,
Rapid cooling is cold for air-cooled and mist.
Preferably, forging total power is warming up to more than complete austenitizing temperature and keeps the temperature for 60~80 DEG C in the step 2,
Cooling medium is water, and cooling medium initial temperature is 20~30 DEG C, and cooling tube temperature is identical with cooling medium initial temperature, forging
Cooling terminates when inside and outside wall surface final cooling temperature reaches 50~80 DEG C.
Preferably, the step 3 is warming up to high tempering area with 40~50 DEG C/h and is kept the temperature, sky of coming out of the stove after insulation
It is cooled to room temperature.
Preferably, 35 steel be carbon mass percent be 0.34~0.36%, manganese mass percent be 0.7~0.8%
Middle carbon high-quality structural steel.
Preferably, the cup shell is electric furnace ingot forging.
Embodiment 1：A kind of shaft furnace heat treatment process of 35 steel bowl shape Forging, the forging specification are 380/ φ 280mm of φ
× 1500mm+ φ 200mm × 800mm+ φ 300mm × 300mm, chemical composition mass percent are：C：0.35%, Si:0.25%,
Mn:0.75%, surplus is Fe and other inevitable impurity, using electric furnace ingot.
Forging total power is warming up to more than complete austenitizing temperature and is kept the temperature for 80 DEG C, and it is cold using mist, when forging table
Face final cooling temperature terminates for 80 DEG C of coolings below Ms (martensite start) point；Forging total power is warming up to complete austenitizing
More than temperature keep the temperature for 70 DEG C, continuous coo1ing into the water after insulation, initial water temperature is 25 DEG C, in rim of a cup in cooling procedure
Inner wall accesses cooling tube, and cooling tube temperature is 25 DEG C, cools down and terminates when wall surface final cooling temperature reaches 60 DEG C inside and outside forging；
50 DEG C of progress preheating insulations, are warming up to 590 DEG C with 45 DEG C/h and are kept the temperature, after insulation below Ms (martensite start) point
Come out of the stove air-cooled.
Using 35 steel bowl shape Forgings of above-mentioned technique productions, quenched rear ultrasonic examination is all qualified, and intensity reaches
More than 600Mpa, impact reach more than 45J, and inside and outside wall hardness is evenly distributed between HB198~223.
Embodiment 2：A kind of shaft furnace heat treatment process of 35 steel bowl shape Forging, the forging specification are 320/ φ 260mm of φ
× 1200mm+ φ 150mm × 500mm+ φ 250mm × 200mm, chemical composition mass percent are：C：0.34%, Si:0.28%,
Mn:0.70%, surplus is Fe and other inevitable impurity, using electric furnace ingot.
Forging total power is warming up to more than complete austenitizing temperature and is kept the temperature for 70 DEG C, and use is air-cooled, when forging table
Face final cooling temperature terminates for 50 DEG C of coolings below Ms (martensite start) point；Forging total power is warming up to complete austenitizing
More than temperature keep the temperature for 60 DEG C, continuous coo1ing into the water after insulation, initial water temperature is 30 DEG C, in rim of a cup in cooling procedure
Inner wall accesses cooling tube, and cooling tube temperature is 30 DEG C, cools down and terminates when wall surface final cooling temperature reaches 80 DEG C inside and outside forging；
30 DEG C of progress preheating insulations, are warming up to 600 DEG C with 50 DEG C/h and are kept the temperature, after insulation below Ms (martensite start) point
Come out of the stove air-cooled.
Using 35 steel bowl shape Forgings of above-mentioned technique productions, quenched rear ultrasonic examination is all qualified, and intensity reaches
More than 600Mpa, impact reach more than 45J, and inside and outside wall hardness is evenly distributed between HB198~223.
Embodiment 3：A kind of shaft furnace heat treatment process of 35 steel bowl shape Forging, the forging specification are 450/ φ 300mm of φ
× 1800mm+ φ 250mm × 800mm+ φ 350mm × 300mm, chemical composition mass percent are：C：0.36%, Si:0.28%,
Mn:0.80%, surplus is Fe and other inevitable impurity, using electric furnace ingot.
Forging total power is warming up to more than complete austenitizing temperature and is kept the temperature for 90 DEG C, and it is cold using mist, when forging table
Face final cooling temperature terminates for 100 DEG C of coolings below Ms (martensite start) point；Forging total power is warming up to complete austenite
Change and more than temperature keep the temperature for 80 DEG C, continuous coo1ing into the water after insulation, initial water temperature is 20 DEG C, in cup in cooling procedure
Mouth inner wall access cooling tube, cooling tube temperature is 20 DEG C, cools down and terminates when wall surface final cooling temperature reaches 50 DEG C inside and outside forging；
70 DEG C of progress preheating insulations, are warming up to 580 DEG C with 40 DEG C/h and are kept the temperature, insulation terminates below Ms (martensite start) point
After come out of the stove it is air-cooled.
Using 35 steel bowl shape Forgings of above-mentioned technique productions, quenched rear ultrasonic examination is all qualified, and intensity reaches
More than 600Mpa, impact reach more than 45J, and inside and outside wall hardness is evenly distributed between HB198~223.
Claims (6)
- A kind of 1. cupulate forging shaft furnace heat treatment process, it is characterised in that：The technique comprises the following steps that：Step 1）, forging total power is warming up to more than complete austenitizing temperature to 50~90 DEG C of insulations, and use rapid cooling, work as forging Part surface final cooling temperature terminates for 50~100 DEG C of coolings below Ms (martensite start) point；Step 2）, forging total power is warming up to more than complete austenitizing temperature to 50~90 DEG C of insulations, be put into after insulation Continuous coo1ing in medium is cooled down, accesses cooling tube in rim of a cup inner wall in cooling procedure, wall surface final cooling temperature reaches inside and outside forging Terminate to cooling at less than 100 DEG C；Step 3）, below Ms (martensite start) point 30~70 DEG C progress preheating insulation, with 30~60 DEG C/h heat up it is paramount Warm refined zone is kept the temperature, and is come out of the stove after insulation air-cooled.
- 2. cupulate forging shaft furnace heat treatment process according to claim 1, it is characterised in that：The step 1）Middle forging Total power is warming up to more than complete austenitizing temperature 70~90 DEG C of insulations, and uses rapid cooling cold for air-cooled and mist.
- 3. cupulate forging shaft furnace heat treatment process according to claim 1, it is characterised in that：The step 2）Middle forging Total power is warming up to more than complete austenitizing temperature 60~80 DEG C of insulations, and continuous cold in cooling medium is put into after insulation But, it is water to cool down medium, and cooling medium initial temperature is 20~30 DEG C, and cooling tube temperature is identical with cooling medium initial temperature, Cooling terminates when wall surface final cooling temperature reaches 50~80 DEG C inside and outside forging.
- 4. cupulate forging shaft furnace heat treatment process according to claim 1, it is characterised in that：The step 3）With 40~ 50 DEG C/h is warming up to high tempering area and is kept the temperature, and coming out of the stove after insulation is air-cooled to room temperature.
- 5. cupulate forging shaft furnace heat treatment process according to claim 1, it is characterised in that：The cupulate forging is 35 Steel, 35 steel are the middle carbon high-quality structural steel that carbon mass percent is 0.34~0.36%, manganese mass percent is 0.7~0.8%.
- 6. cupulate forging shaft furnace heat treatment process according to claim 1, it is characterised in that：The cup shell is electric furnace Ingot forging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711187480.7A CN107974544A (en) | 2017-11-24 | 2017-11-24 | The shaft furnace heat treatment process of cupulate forging |
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| CN201711187480.7A CN107974544A (en) | 2017-11-24 | 2017-11-24 | The shaft furnace heat treatment process of cupulate forging |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679213A (en) * | 2022-11-01 | 2023-02-03 | 河南中原特钢装备制造有限公司 | Heat treatment process for controlling total section hardness difference of 42CrMo forge piece |
Citations (4)
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|---|---|---|---|---|
| CN101787419A (en) * | 2009-12-25 | 2010-07-28 | 中原特钢股份有限公司 | Heat treatment process of AISI4340 steel forgings |
| CN105838855A (en) * | 2016-05-27 | 2016-08-10 | 中原特钢股份有限公司 | Post-forging dehydrogenation annealing technology of chromium-containing high-nickel alloy steel forged piece |
| CN106222544A (en) * | 2016-08-30 | 2016-12-14 | 张家港中环海陆特锻股份有限公司 | Annular forging piece and heat treatment method thereof |
| CN106381365A (en) * | 2016-08-16 | 2017-02-08 | 赵宇晨 | Pit type furnace thermal treatment process for thick-wall blind-hole forged piece |
-
2017
- 2017-11-24 CN CN201711187480.7A patent/CN107974544A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787419A (en) * | 2009-12-25 | 2010-07-28 | 中原特钢股份有限公司 | Heat treatment process of AISI4340 steel forgings |
| CN105838855A (en) * | 2016-05-27 | 2016-08-10 | 中原特钢股份有限公司 | Post-forging dehydrogenation annealing technology of chromium-containing high-nickel alloy steel forged piece |
| CN106381365A (en) * | 2016-08-16 | 2017-02-08 | 赵宇晨 | Pit type furnace thermal treatment process for thick-wall blind-hole forged piece |
| CN106222544A (en) * | 2016-08-30 | 2016-12-14 | 张家港中环海陆特锻股份有限公司 | Annular forging piece and heat treatment method thereof |
Non-Patent Citations (1)
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|---|
| 王忠诚: "《热处理工实用手册》", 31 January 2013, 机械工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679213A (en) * | 2022-11-01 | 2023-02-03 | 河南中原特钢装备制造有限公司 | Heat treatment process for controlling total section hardness difference of 42CrMo forge piece |
| CN115679213B (en) * | 2022-11-01 | 2023-08-25 | 河南中原特钢装备制造有限公司 | Heat treatment process for controlling full-section hardness difference of 42CrMo forge piece |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20180821 Address after: 459000 531 Industrial Park, Tiger Hill Industrial Cluster, Jiyuan City, Jiaozuo, Henan Applicant after: Henan Zhongyuan special steel equipment manufacturing Co., Ltd. Address before: 459000 Xiao Zhai, Jiyuan Town, Jiyuan City, Henan Applicant before: Zhongyuan Special Steel Co., Ltd. |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180501 |
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