CN107881303A - Steel annealing process - Google Patents
Steel annealing process Download PDFInfo
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- CN107881303A CN107881303A CN201711490527.7A CN201711490527A CN107881303A CN 107881303 A CN107881303 A CN 107881303A CN 201711490527 A CN201711490527 A CN 201711490527A CN 107881303 A CN107881303 A CN 107881303A
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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
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
Abstract
The present invention provides a kind of steel annealing process, comprises the following steps：（1）Steel are placed in annealing furnace；（2）430 DEG C are warming up to carrying out the first stage in stove, and is incubated 4 hours；（3）Second stage is warming up to 600 DEG C, and is incubated 2 hours；（4）Phase III is warming up to 700 DEG C, and is incubated 18h;（5）After band cover slow cooling 2 hours, air-cooled to 300 DEG C of cooling dome is changed, finally discharges water and carries out water cooling to 80 DEG C；（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.The steel annealing process of the present invention, controlled by accurate annealing temperature and duration, the comprehensive mechanical performance of steel can be effectively improved.
Description
Technical field
The present invention relates to steel technical field of heat treatment, more particularly to a kind of steel annealing process.
Background technology
In order that steel have required mechanical property, physical property and chemical property, except reasonable selection material and into
Outside type technique, Technology for Heating Processing is often essential, and it not only changes the profile of steel, can be given full play to by heat treatment
The potentiality of steel, and the various properties needed for steel are assigned, reach raising steel product quality, increase the service life, it is ensured that machine
Device purpose safe and reliable to operation.And the heating-up temperature of spheroidizing is that nodularization degree whether key factor completely influenceed.Add
Hot temperature selection is suitable, both can guarantee that lamellar pearlite disappeared, and and can retains the carbide that a part is not completely dissolved in austenite,
As nodularization core, the normal spherodized structure of thicker granular carbide is ultimately formed.When austenitizing temperature is very high, carbon
Compound is all dissolved and homogenized, and lamellar pearlite is always obtained after cooling, and cooling velocity directly affects carbide particle
Size and uniformity.Cooling is too fast, and carbide particle is too thin, does not form the possibility of flaky carbide, makes hardness higher.It is cold
Carbide particle is again excessively thick when but crossing slow.
It is so treating steel and make annealing treatment the part of most critical to annealing in-furnace temperature and temperature ramp rate
Control.
The content of the invention
Therefore, an object of the present invention is to provide a kind of steel annealing process, passes through accurate annealing temperature
Controlled with duration, the comprehensive mechanical performance of steel can be effectively improved.
For the above-mentioned purpose, the present invention provides a kind of steel annealing process, the steel annealing process include with
Lower step：
（1）Steel are placed in annealing furnace；
（2）To carrying out first stage heating in stove, temperature rises to 430 DEG C~450 DEG C, and enters at a temperature of 430 DEG C~450 DEG C
Row is incubated for the first time, and soaking time is 4~5 hours；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 600 from 430 DEG C~450 DEG C
DEG C~620 DEG C, and carry out second at a temperature of 600 DEG C~620 DEG C and be incubated, soaking time is 2~3 hours；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 700 from 600 DEG C~620 DEG C
DEG C~720 DEG C, and third time insulation is carried out at a temperature of 700 DEG C~720 DEG C, soaking time is 18~20 hours;
（5）After the completion of third time is incubated, after band cover slow cooling 2 hours, change air-cooled to 290 DEG C~310 DEG C of cooling dome, finally discharge water into
Water-filling is cooled to 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
As optional technical scheme, step（1）In, furnace atmosphere is pure nitrogen gas, and the content of oxygen is 0%, and pressure is
65-70mbar。
As optional technical scheme, the first stage heating rate of heating is 120-200 DEG C/h.
As optional technical scheme, the heating rate of second stage heating is 60-150 DEG C/h.
As optional technical scheme, the phase III heating rate of heating is 50-100 DEG C/h.
As optional technical scheme, step（5）In, the air-cooled time is 7-8 hours.
As optional technical scheme, the steel annealing process comprises the following steps：
（1）Steel are placed in annealing furnace；
（2）To carrying out first stage heating in stove, temperature rises to 430 DEG C, and first time insulation is carried out at a temperature of 430 DEG C,
Soaking time is 4 hours；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 600 DEG C from 430 DEG C, and in
Carry out being incubated for second at a temperature of 600 DEG C, soaking time is 2 hours；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 700 DEG C from 600 DEG C, and
Third time insulation is carried out at a temperature of 700 DEG C, soaking time is 18 hours;
（5）After the completion of third time is incubated, after cover slow cooling 2 hours, air-cooled to 300 DEG C of cooling dome is changed, finally discharges water and carries out water cooling
To 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
Compared with prior art, the present invention uses staged temperature-rising method, by strict process parameter control, can obtain
To the mechanical performance such as preferable intensity, moulding, and the steel surface after nodularization of the present invention is bright, Non-carbonized decarburization, pearlite
Oxygen potential is more than or equal to 99.5%.In addition, this is simple for process, production efficiency is high.
It can be further understood on the advantages and spirit of the present invention by following detailed description of the invention.
Embodiment
The present invention provides a kind of steel annealing process, and the steel annealing process comprises the following steps：
（1）Steel are placed in annealing furnace, furnace atmosphere is pure nitrogen gas, and the content of oxygen is 0%, pressure 65-70mbar；
（2）To carrying out first stage heating in stove, temperature rises to 430 DEG C~450 DEG C, and enters at a temperature of 430 DEG C~450 DEG C
Row is incubated for the first time, and soaking time is 4~5 hours, while purges smoke evacuation, improves furnace atmosphere；Wherein the first stage heats up
Heating rate be 120-200 DEG C/h；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 600 from 430 DEG C~450 DEG C
DEG C~620 DEG C, and carry out second at a temperature of 600 DEG C~620 DEG C and be incubated, soaking time is 2~3 hours；Wherein second
The stage heating rate of heating is 60-150 DEG C/h；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 700 from 600 DEG C~620 DEG C
DEG C~720 DEG C, and third time insulation is carried out at a temperature of 700 DEG C~720 DEG C, soaking time is 18~20 hours；Wherein,
The three stages heating rate of heating is 50-100 DEG C/h；
（5）After the completion of third time is incubated, after band cover slow cooling 2 hours, air-cooled to 290 DEG C~310 DEG C of cooling dome is changed, the air-cooled time is
7-8 hours, finally discharge water and carry out water cooling to 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
Wherein it is preferred that steel annealing process comprises the following steps：
（1）Steel are placed in annealing furnace；
（2）To carrying out first stage heating in stove, temperature rises to 430 DEG C, and first time insulation is carried out at a temperature of 430 DEG C,
Soaking time is 4 hours；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 600 DEG C from 430 DEG C, and in
Carry out being incubated for second at a temperature of 600 DEG C, soaking time is 2 hours；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 700 DEG C from 600 DEG C, and
Third time insulation is carried out at a temperature of 700 DEG C, soaking time is 18 hours;
（5）After the completion of third time is incubated, after cover slow cooling 2 hours, air-cooled to 300 DEG C of cooling dome is changed, finally discharges water and carries out water cooling
To 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
Illustrated with reference to embodiment.
Embodiment 1：
In the present embodiment, steel annealing process comprises the following steps：
（1）Steel are placed in annealing furnace, furnace atmosphere is pure nitrogen gas, and the content of oxygen is 0%, pressure 65mbar；
（2）To carrying out first stage heating in stove, temperature rises to 430 DEG C, and first time insulation is carried out at a temperature of 430 DEG C,
Soaking time is 4 hours, while purges smoke evacuation, improves furnace atmosphere；The heating rate of wherein first stage heating is 120
℃/h；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 600 DEG C from 430 DEG C, and in
Carry out being incubated for second at a temperature of 600 DEG C, soaking time is 2 hours；Wherein second stage heating heating rate for 60 DEG C/
h；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 700 DEG C from 600 DEG C, and
Third time insulation, soaking time 18h are carried out at a temperature of 700 DEG C;Wherein, the phase III heating heating rate for 50 DEG C/
h；
（5）After the completion of third time is incubated, after cover slow cooling 2 hours, air-cooled to 300 DEG C of cooling dome is changed, the air-cooled time is 7 hours,
Finally discharge water and carry out water cooling to 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
Wherein, to being detected using the steel after the annealing of the present embodiment method, it is found that its pearlitic spheroidization rate is more than
In 99.5%, and with the mechanical performance such as preferable intensity, moulding.
Embodiment 2：
In the present embodiment, steel annealing process comprises the following steps：
（1）Steel are placed in annealing furnace, furnace atmosphere is pure nitrogen gas, and the content of oxygen is 0%, pressure 70mbar；
（2）To carrying out first stage heating in stove, temperature rises to 450 DEG C, and first time insulation is carried out at a temperature of 450 DEG C,
Soaking time is 5 hours, while purges smoke evacuation, improves furnace atmosphere；The heating rate of wherein first stage heating is 200
℃/h；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 620 DEG C from 450 DEG C, and in
Carry out being incubated for second at a temperature of 620 DEG C, soaking time is 3 hours；The heating rate of wherein second stage heating is 150
℃/h；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 720 DEG C from 620 DEG C, and
Third time insulation, soaking time 20h are carried out at a temperature of 720 DEG C;Wherein, the heating rate of phase III heating is 100
℃/h；
（5）After the completion of third time is incubated, after cover slow cooling 2 hours, air-cooled to 290 DEG C of cooling dome is changed, the air-cooled time is 8 hours,
Finally discharge water and carry out water cooling to 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
Wherein, to being detected using the steel after the annealing of the present embodiment method, it is found that its pearlitic spheroidization rate is more than
In 99.5%, and with the mechanical performance such as preferable intensity, moulding.
Embodiment 3：
In the present embodiment, steel annealing process comprises the following steps：
（1）Steel are placed in annealing furnace, furnace atmosphere is pure nitrogen gas, and the content of oxygen is 0%, pressure 68mbar；
（2）To carrying out first stage heating in stove, temperature rises to 430 DEG C, and first time insulation is carried out at a temperature of 430 DEG C,
Soaking time is 4 hours, while purges smoke evacuation, improves furnace atmosphere；The heating rate of wherein first stage heating is 160
℃/h；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 600 DEG C from 430 DEG C, and in
Carry out being incubated for second at a temperature of 600 DEG C, soaking time is 2 hours；The heating rate of wherein second stage heating is 100
℃/h；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 700 DEG C from 600 DEG C, and
Third time insulation, soaking time 18h are carried out at a temperature of 700 DEG C;Wherein, the phase III heating heating rate for 70 DEG C/
h；
（5）After the completion of third time is incubated, after cover slow cooling 2 hours, air-cooled to 310 DEG C of cooling dome is changed, the air-cooled time is 7.5 small
When, finally discharge water and carry out water cooling to 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
Wherein, to being detected using the steel after the annealing of the present embodiment method, it is found that its pearlitic spheroidization rate is more than
In 99.5%, and with the mechanical performance such as preferable intensity, moulding.
In summary, traditional handicraft uses linear heating, is unfavorable for very much furnace charge evenly heating, although there is strong convection gas strong
Changed heat transfer, but heat penetration time of the furnace charge from surface to center, also with material heat absorption rate in itself, the size phase of specification
Close.And the present invention realizes the working conditions such as accurate guarantee furnace temperature decision, accurate control heating and cooling velocity in equipment
In the case of, process route has followed strictly the three elements of annealing process, i.e. heating-up temperature, soaking time and cooling velocity,
The present invention heat up and be incubated three times three times, secondary insulation, is advantageous to thermal uniformity during big furnace volume spheroidizing,
Simultaneously condition is provided for phase transformation thereafter and nodularization；The time of third time insulation sets long, provides and fills for nodularization
The time and temperature of foot, so that the steel after annealing process of the present invention can obtain the machinery such as preferable intensity, moulding
Performance, and the steel surface after nodularization of the present invention is bright, and Non-carbonized decarburization, pearlitic spheroidization rate is more than or equal to 99.5%.Separately
Outside, this is simple for process, and production efficiency is high.
By the above detailed description of preferred embodiments, it is intended to more clearly describe the feature of the present invention with spiritual,
And not protection scope of the present invention is any limitation as with above-mentioned disclosed preferred embodiment.On the contrary, its purpose
It is intended to cover various changes and has being arranged in the scope of the claims of the invention to be applied of equality.Cause
This, the apllied scope of the claims of the present invention should make most broad explanation according to above-mentioned explanation, to cause it
Cover all possible change and the arrangement of tool equality.
Claims (7)
1. a kind of steel annealing process, it is characterised in that the steel annealing process comprises the following steps：
（1）Steel are placed in annealing furnace；
（2）To carrying out first stage heating in stove, temperature rises to 430 DEG C~450 DEG C, and enters at a temperature of 430 DEG C~450 DEG C
Row is incubated for the first time, and soaking time is 4~5 hours；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 600 from 430 DEG C~450 DEG C
DEG C~620 DEG C, and carry out second at a temperature of 600 DEG C~620 DEG C and be incubated, soaking time is 2~3 hours；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 700 from 600 DEG C~620 DEG C
DEG C~720 DEG C, and third time insulation is carried out at a temperature of 700 DEG C~720 DEG C, soaking time is 18~20 hours;
（5）After the completion of third time is incubated, after band cover slow cooling 2 hours, change air-cooled to 290 DEG C~310 DEG C of cooling dome, finally discharge water into
Water-filling is cooled to 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
2. steel annealing process as claimed in claim 1, it is characterised in that step（1）In, furnace atmosphere is purity nitrogen
Gas, the content of oxygen is 0%, pressure 65-70mbar.
3. steel annealing process as claimed in claim 1, it is characterised in that the first stage heating heating rate be
120-200℃/h。
4. steel annealing process as claimed in claim 1, it is characterised in that the second stage heating heating rate be
60-150℃/h。
5. steel annealing process as claimed in claim 1, it is characterised in that the phase III heating heating rate be
50-100℃/h。
6. steel annealing process as claimed in claim 1, it is characterised in that step（5）In, the air-cooled time is that 7-8 is small
When.
7. steel annealing process as claimed in claim 1, it is characterised in that the steel annealing process includes following
Step：
（1）Steel are placed in annealing furnace；
（2）To carrying out first stage heating in stove, temperature rises to 430 DEG C, and first time insulation is carried out at a temperature of 430 DEG C,
Soaking time is 4 hours；
（3）After the completion of being incubated for the first time, second stage heating is carried out to in-furnace temperature, temperature rises to 600 DEG C from 430 DEG C, and in
Carry out being incubated for second at a temperature of 600 DEG C, soaking time is 2 hours；
（4）After the completion of second is incubated, phase III heating is carried out to in-furnace temperature, temperature rises to 700 DEG C from 600 DEG C, and
Third time insulation is carried out at a temperature of 700 DEG C, soaking time is 18 hours;
（5）After the completion of third time is incubated, after cover slow cooling 2 hours, air-cooled to 300 DEG C of cooling dome is changed, finally discharges water and carries out water cooling
To 80 DEG C；
（6）The steel after annealing are taken out from annealing furnace, room temperature is air-cooled to outside stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711490527.7A CN107881303A (en) | 2017-12-30 | 2017-12-30 | Steel annealing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711490527.7A CN107881303A (en) | 2017-12-30 | 2017-12-30 | Steel annealing process |
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| Publication Number | Publication Date |
|---|---|
| CN107881303A true CN107881303A (en) | 2018-04-06 |
Family
ID=61770483
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|---|---|---|---|
| CN201711490527.7A Pending CN107881303A (en) | 2017-12-30 | 2017-12-30 | Steel annealing process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109735692A (en) * | 2019-03-06 | 2019-05-10 | 浙江亚磊型钢冷拔有限公司 | A kind of steel staged annealing process |
| CN110252959A (en) * | 2019-06-25 | 2019-09-20 | 巢湖市聚源机械有限公司 | A kind of press machine lower and upper cross-member casting technique |
| CN110904313A (en) * | 2018-09-18 | 2020-03-24 | 重庆市忠德锻压有限公司 | Box type natural gas spheroidizing annealing process |
| CN111519000A (en) * | 2020-04-27 | 2020-08-11 | 浙江丰原型钢科技有限公司 | Round steel blank spheroidizing annealing process |
| CN111944960A (en) * | 2020-07-15 | 2020-11-17 | 涟源钢铁集团有限公司 | Method for reducing spheroidizing annealing decarburization of medium-high carbon steel in hot rolling |
| CN111961814A (en) * | 2020-07-30 | 2020-11-20 | 佛山市高明基业冷轧钢板有限公司 | Spheroidizing annealing process for high-carbon steel |
| CN112553420A (en) * | 2020-12-02 | 2021-03-26 | 太仓富勒姆纳米新材料科技有限公司 | Strong-convection spheroidizing annealing process for rivets for automobile bearing retainer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110904313A (en) * | 2018-09-18 | 2020-03-24 | 重庆市忠德锻压有限公司 | Box type natural gas spheroidizing annealing process |
| CN109735692A (en) * | 2019-03-06 | 2019-05-10 | 浙江亚磊型钢冷拔有限公司 | A kind of steel staged annealing process |
| CN110252959A (en) * | 2019-06-25 | 2019-09-20 | 巢湖市聚源机械有限公司 | A kind of press machine lower and upper cross-member casting technique |
| CN111519000A (en) * | 2020-04-27 | 2020-08-11 | 浙江丰原型钢科技有限公司 | Round steel blank spheroidizing annealing process |
| CN111944960A (en) * | 2020-07-15 | 2020-11-17 | 涟源钢铁集团有限公司 | Method for reducing spheroidizing annealing decarburization of medium-high carbon steel in hot rolling |
| CN111944960B (en) * | 2020-07-15 | 2022-03-08 | 涟源钢铁集团有限公司 | Method for reducing spheroidizing annealing decarburization of medium-high carbon steel in hot rolling |
| CN111961814A (en) * | 2020-07-30 | 2020-11-20 | 佛山市高明基业冷轧钢板有限公司 | Spheroidizing annealing process for high-carbon steel |
| CN112553420A (en) * | 2020-12-02 | 2021-03-26 | 太仓富勒姆纳米新材料科技有限公司 | Strong-convection spheroidizing annealing process for rivets for automobile bearing retainer |
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