CN112210643A - Annealing process of cold-rolled strip steel - Google Patents
Annealing process of cold-rolled strip steel Download PDFInfo
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- CN112210643A CN112210643A CN202010992269.8A CN202010992269A CN112210643A CN 112210643 A CN112210643 A CN 112210643A CN 202010992269 A CN202010992269 A CN 202010992269A CN 112210643 A CN112210643 A CN 112210643A
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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
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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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Abstract
The invention discloses a cold-rolled strip steel annealing process, which comprises the following steps: feeding the strip steel to be annealed into an annealing furnace, sealing, heating to 700-750 ℃ after sealing, impacting the strip steel by nitrogen, and conveying hydrogen into the annealing furnace; during annealing, firstly raising the temperature in the annealing furnace to 700-720 ℃, keeping the continuous purging of the hydrogen, and preserving the heat for 1-2h when the temperature in the annealing furnace is reduced to 600-650 ℃; and when the temperature in the annealing furnace is reduced to 500-520 ℃, preserving the heat for 30-35 min. The annealing process of the cold-rolled strip steel, disclosed by the invention, has the advantages that firstly, an oxygen-free environment can be manufactured in advance by introducing nitrogen into the annealing furnace before sealing, and the reaction between the strip steel and oxygen during annealing is avoided, so that the quality of the strip steel is improved; secondly, when the temperature is kept, nitrogen is used for impacting the strip steel, so that impurities in the strip steel can be taken out, and the annealing efficiency of the strip steel can be improved; thirdly, the temperature of each annealing stage is controlled, so that the strip steel is annealed at the optimal temperature, and the annealing effect of the strip steel can be improved.
Description
Technical Field
The invention relates to the field of cold-rolled strip steel, in particular to a cold-rolled strip steel annealing process.
Background
The cold-rolled strip steel is formed by rolling a hot-rolled coil serving as a raw material at the temperature below the recrystallization temperature, comprises a plate and a coil, can be produced by various domestic steel mills such as Bao steel, Wu steel, saddle steel and the like, and is called a steel plate, also called a box plate or a flat plate;
at present, when the existing cold-rolled strip steel is annealed, because the temperature in an annealing furnace is high, a user cannot assist in annealing of the strip steel from the outside, and only by changing the temperature and the gas introduction concentration during annealing of the strip steel, the annealing efficiency of the strip steel is low when the annealing is finished, the annealing period is long, and the annealing efficiency of the strip steel is influenced.
Disclosure of Invention
The invention mainly aims to provide a cold-rolled strip steel annealing process which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a cold-rolled strip steel annealing process comprises the following steps:
sealing an annealing furnace: feeding the strip steel to be annealed into an annealing furnace for sealing, and heating to 385-390 ℃;
temperature maintenance: after the annealing furnace is sealed, the temperature is raised to 700 ℃ and 750 ℃, and the strip steel is impacted by nitrogen;
air blowing: firstly, conveying 1-2% hydrogen into an annealing furnace, introducing the hydrogen for 32-35min, keeping the temperature for 8-10min, and then blowing the hydrogen with the concentration of 3-5% for 30-40 min;
primary annealing: firstly, raising the temperature in the annealing furnace to 700-720 ℃, and keeping the temperature for 2-3 h; keeping the continuous purging of the hydrogen, and keeping the temperature for 1-2h when the temperature in the annealing furnace is reduced to 600-650 ℃; when the temperature in the annealing furnace is reduced to 500-520 ℃, the temperature is kept for 30-35 min;
and (4) annealing again: after the primary annealing, the temperature in the annealing furnace is increased to 730-750 ℃, the temperature is kept for 10-20min, and then the air cooling is carried out on the strip steel in the annealing furnace;
strip steel cleaning: and (3) putting the strip steel cooled to room temperature into deionized water for ultrasonic cleaning, and putting the cleaned strip steel into a dryer for drying to obtain the cold-rolled strip steel.
Preferably, before the annealing furnace is sealed, nitrogen is firstly conveyed into the annealing furnace, the nitrogen flow rate is 48-50L/min, and the annealing furnace is preheated at the preheating temperature of 250-280 ℃.
Preferably, when the steel is fed into the annealing furnace, nitrogen is fed into the annealing furnace at a rate of 80-85L/min, and the temperature of the annealing furnace is raised to 350-360 ℃.
Preferably, when the nitrogen impacts the strip steel, the nitrogen is controlled to impact the strip steel at the pressure of 2.0-2.4 standard atmospheric pressures, the nitrogen stops after 5-8min of impact, the strip steel is kept stand for 1-2min, and the strip steel is impacted again.
Preferably, during blowing, the blowing flow of the hydrogen is 20-24L/min, the temperature of the hydrogen is 50-68 ℃, and the concentration of the hydrogen is the concentration of the mixed hydrogen and nitrogen.
Preferably, in the re-annealing, the air cooling comprises the following steps:
(1) and (3) slowly cooling: conveying nitrogen with the temperature of 700-710 ℃ into the annealing furnace, and regulating the temperature of the nitrogen at the speed of 4-5 ℃/min;
(2) and (3) rapidly cooling: when the temperature of the strip steel is reduced to 580-600 ℃, the temperature of the nitrogen is reduced at the temperature of 20-25 ℃/min;
(3) cooling: when the temperature of the strip steel is reduced to 280-300 ℃, the strip steel is taken out of the annealing furnace and is cooled to room temperature.
Preferably, after drying, the surface of the strip steel is sprayed with the paint and soaked in the clear oil for 1-2min, and the clear oil on the surface of the strip steel is blown away by a fan.
Compared with the prior art, the invention has the following beneficial effects:
firstly, an oxygen-free environment can be manufactured in advance by introducing nitrogen into the annealing furnace before sealing, and the reaction between the strip steel and oxygen during annealing is avoided, so that the quality of the strip steel is improved;
secondly, when the temperature is kept, nitrogen is used for impacting the strip steel, so that impurities in the strip steel can be taken out, and the annealing efficiency of the strip steel can be improved;
thirdly, the temperature of the hydrogen is reduced during blowing, so that the diffusion speed of the hydrogen in the annealing furnace can be accelerated, and the hydrogen can be better contacted with the strip steel;
fourthly, the temperature of each annealing stage is controlled, so that the strip steel is annealed at the optimal temperature, and the annealing effect of the strip steel can be improved.
Drawings
FIG. 1 is a flow chart of the overall structure of the annealing process of cold-rolled strip steel.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Comparative example
As shown in fig. 1, the cold-rolled strip steel annealing process comprises the following steps:
sealing an annealing furnace: feeding the strip steel to be annealed into an annealing furnace, sealing, heating to 385 ℃, conveying nitrogen into the annealing furnace at a speed of 80L/min, raising the temperature of the annealing furnace to 350 ℃, conveying nitrogen into the annealing furnace at a flow rate of 48L/min before sealing of the annealing furnace, and preheating the annealing furnace at a preheating temperature of 250 ℃;
temperature maintenance: after the annealing furnace is sealed, heating to 700 ℃;
air blowing: firstly, conveying 1% hydrogen into an annealing furnace, introducing the hydrogen for 32min, keeping the temperature for 8min, then blowing the 4% hydrogen, keeping the temperature for 30min, wherein the blowing flow of the hydrogen is 20L/min, the temperature of the hydrogen is 50 ℃, and the concentration of the hydrogen is the concentration of the mixed hydrogen and nitrogen;
primary annealing: firstly, raising the temperature in the annealing furnace to 700 ℃, and keeping for 2 hours; keeping the continuous purging of the hydrogen, and keeping the temperature for 1h when the temperature in the annealing furnace is reduced to 600 ℃; when the temperature in the annealing furnace is reduced to 500 ℃, preserving the heat for 30 min;
and (4) annealing again: after primary annealing, raising the temperature in the annealing furnace to 730 ℃, preserving the temperature for 10min, and then carrying out air cooling on the strip steel in the annealing furnace, wherein the air cooling comprises the following steps:
(1) and (3) slowly cooling: conveying nitrogen with the temperature of 700 ℃ into the annealing furnace, and regulating the temperature of the nitrogen at a speed of 4 ℃/min;
(2) and (3) rapidly cooling: when the temperature of the strip steel is reduced to 580 ℃, the temperature of the nitrogen is reduced by 20 ℃/min;
(3) cooling: taking out the strip steel from the annealing furnace when the temperature of the strip steel is reduced to 280 ℃, and cooling to room temperature;
strip steel cleaning: and (2) putting the strip steel cooled to room temperature into deionized water for ultrasonic cleaning, putting the strip steel into a dryer for drying after cleaning, spraying a coating on the surface of the strip steel after drying, soaking the strip steel into clear oil for 1min, and blowing away the clear oil on the surface of the strip steel by using a fan to obtain the cold-rolled strip steel.
Example 1
As shown in fig. 1, the cold-rolled strip steel annealing process comprises the following steps:
sealing an annealing furnace: feeding the strip steel to be annealed into an annealing furnace, sealing, heating to 385 ℃, conveying nitrogen into the annealing furnace at a speed of 80L/min, raising the temperature of the annealing furnace to 350 ℃, conveying nitrogen into the annealing furnace at a flow rate of 48L/min before sealing of the annealing furnace, and preheating the annealing furnace at a preheating temperature of 250 ℃;
temperature maintenance: after the annealing furnace is sealed, the temperature is raised to 700 ℃, the strip steel is impacted by nitrogen, when the strip steel is impacted by the nitrogen, the strip steel is impacted by the nitrogen under the pressure of 2.0 standard atmospheric pressure, the strip steel is stopped after impacting for 5min, the strip steel is kept standing for 1min, and the strip steel is impacted again;
air blowing: firstly, conveying 1% hydrogen into an annealing furnace, introducing the hydrogen for 32min, keeping the temperature for 8min, then blowing the 4% hydrogen, keeping the temperature for 30min, wherein the blowing flow of the hydrogen is 20L/min, the temperature of the hydrogen is 50 ℃, and the concentration of the hydrogen is the concentration of the mixed hydrogen and nitrogen;
primary annealing: firstly, raising the temperature in the annealing furnace to 700 ℃, and keeping for 2 hours; keeping the continuous purging of the hydrogen, and keeping the temperature for 1h when the temperature in the annealing furnace is reduced to 600 ℃; when the temperature in the annealing furnace is reduced to 500 ℃, preserving the heat for 30 min;
and (4) annealing again: after primary annealing, raising the temperature in the annealing furnace to 730 ℃, preserving the temperature for 10min, and then carrying out air cooling on the strip steel in the annealing furnace, wherein the air cooling comprises the following steps:
(1) and (3) slowly cooling: conveying nitrogen with the temperature of 700 ℃ into the annealing furnace, and regulating the temperature of the nitrogen at a speed of 4 ℃/min;
(2) and (3) rapidly cooling: when the temperature of the strip steel is reduced to 580 ℃, the temperature of the nitrogen is reduced by 20 ℃/min;
(3) cooling: taking out the strip steel from the annealing furnace when the temperature of the strip steel is reduced to 280 ℃, and cooling to room temperature;
strip steel cleaning: and (2) putting the strip steel cooled to room temperature into deionized water for ultrasonic cleaning, putting the strip steel into a dryer for drying after cleaning, spraying a coating on the surface of the strip steel after drying, soaking the strip steel into clear oil for 1min, and blowing away the clear oil on the surface of the strip steel by using a fan to obtain the cold-rolled strip steel.
Example 2
As shown in fig. 1, the cold-rolled strip steel annealing process comprises the following steps:
sealing an annealing furnace: feeding the strip steel to be annealed into an annealing furnace, sealing, heating to 385 ℃, conveying nitrogen into the annealing furnace at a speed of 80L/min, raising the temperature of the annealing furnace to 350 ℃, conveying nitrogen into the annealing furnace at a flow rate of 48L/min before sealing of the annealing furnace, and preheating the annealing furnace at a preheating temperature of 250 ℃;
temperature maintenance: after the annealing furnace is sealed, the temperature is raised to 700 ℃, the strip steel is impacted by nitrogen, when the strip steel is impacted by the nitrogen, the strip steel is impacted by the nitrogen under the pressure of 2.2 standard atmospheric pressures, the strip steel is stopped after impacting for 5min, the strip steel is kept standing for 1min, and the strip steel is impacted again;
air blowing: firstly, conveying 1% hydrogen into an annealing furnace, introducing the hydrogen for 32min, keeping the temperature for 8min, then blowing the 4% hydrogen, keeping the temperature for 30min, wherein the blowing flow of the hydrogen is 20L/min, the temperature of the hydrogen is 50 ℃, and the concentration of the hydrogen is the concentration of the mixed hydrogen and nitrogen;
primary annealing: firstly, raising the temperature in the annealing furnace to 700 ℃, and keeping for 2 hours; keeping the continuous purging of the hydrogen, and keeping the temperature for 1h when the temperature in the annealing furnace is reduced to 600 ℃; when the temperature in the annealing furnace is reduced to 500 ℃, preserving the heat for 30 min;
and (4) annealing again: after primary annealing, raising the temperature in the annealing furnace to 730 ℃, preserving the temperature for 10min, and then carrying out air cooling on the strip steel in the annealing furnace, wherein the air cooling comprises the following steps:
(1) and (3) slowly cooling: conveying nitrogen with the temperature of 700 ℃ into the annealing furnace, and regulating the temperature of the nitrogen at a speed of 4 ℃/min;
(2) and (3) rapidly cooling: when the temperature of the strip steel is reduced to 580 ℃, the temperature of the nitrogen is reduced by 20 ℃/min;
(3) cooling: taking out the strip steel from the annealing furnace when the temperature of the strip steel is reduced to 280 ℃, and cooling to room temperature;
strip steel cleaning: and (2) putting the strip steel cooled to room temperature into deionized water for ultrasonic cleaning, putting the strip steel into a dryer for drying after cleaning, spraying a coating on the surface of the strip steel after drying, soaking the strip steel into clear oil for 1min, and blowing away the clear oil on the surface of the strip steel by using a fan to obtain the cold-rolled strip steel.
Example 3
As shown in fig. 1, the cold-rolled strip steel annealing process comprises the following steps:
sealing an annealing furnace: feeding the strip steel to be annealed into an annealing furnace, sealing, heating to 385 ℃, conveying nitrogen into the annealing furnace at a speed of 80L/min, raising the temperature of the annealing furnace to 350 ℃, conveying nitrogen into the annealing furnace at a flow rate of 48L/min before sealing of the annealing furnace, and preheating the annealing furnace at a preheating temperature of 250 ℃;
temperature maintenance: after the annealing furnace is sealed, the temperature is raised to 700 ℃, the strip steel is impacted by nitrogen, when the strip steel is impacted by the nitrogen, the strip steel is impacted by the nitrogen under the pressure of 2.4 standard atmospheric pressures, the strip steel is stopped after impacting for 5min, the strip steel is kept standing for 1min, and the strip steel is impacted again;
air blowing: firstly, conveying 1% hydrogen into an annealing furnace, introducing the hydrogen for 32min, keeping the temperature for 8min, then blowing the 4% hydrogen, keeping the temperature for 30min, wherein the blowing flow of the hydrogen is 20L/min, the temperature of the hydrogen is 50 ℃, and the concentration of the hydrogen is the concentration of the mixed hydrogen and nitrogen;
primary annealing: firstly, raising the temperature in the annealing furnace to 700 ℃, and keeping for 2 hours; keeping the continuous purging of the hydrogen, and keeping the temperature for 1h when the temperature in the annealing furnace is reduced to 600 ℃; when the temperature in the annealing furnace is reduced to 500 ℃, preserving the heat for 30 min;
and (4) annealing again: after primary annealing, raising the temperature in the annealing furnace to 730 ℃, preserving the temperature for 10min, and then carrying out air cooling on the strip steel in the annealing furnace, wherein the air cooling comprises the following steps:
(1) and (3) slowly cooling: conveying nitrogen with the temperature of 700 ℃ into the annealing furnace, and regulating the temperature of the nitrogen at a speed of 4 ℃/min;
(2) and (3) rapidly cooling: when the temperature of the strip steel is reduced to 580 ℃, the temperature of the nitrogen is reduced by 20 ℃/min;
(3) cooling: taking out the strip steel from the annealing furnace when the temperature of the strip steel is reduced to 280 ℃, and cooling to room temperature;
strip steel cleaning: and (2) putting the strip steel cooled to room temperature into deionized water for ultrasonic cleaning, putting the strip steel into a dryer for drying after cleaning, spraying a coating on the surface of the strip steel after drying, soaking the strip steel into clear oil for 1min, and blowing away the clear oil on the surface of the strip steel by using a fan to obtain the cold-rolled strip steel.
In table 1, the comparative examples are not only strip steel impact, but also examples 1 to 3 are strip steel impact, in which the strip steel is compressed to different standard atmospheric pressures by nitrogen gas, the hardness of the strip steel, the roughness of the bent portion of the strip steel after being folded in half, and the annealing time are measured, and the test results are as follows:
| air pressure during nitrogen impact (Standard atmospheric pressure) | Hardness of strip steel (HR) | Roughness of the bend after doubling back (Ra) | Annealing time (h) | |
| Comparison ofExample (b) | 55 | 5.2 | 9.6 | |
| Example 1 | 2.0 | 50 | 2.3 | 8.4 |
| Example 2 | 2.2 | 51 | 2.1 | 7.9 |
| Example 3 | 2.4 | 53 | 2.4 | 7.8 |
TABLE 1
It can be seen from the experimental data in table 1 that, as compared with the example 1, when annealing, the strip steel is impacted by nitrogen, which not only reduces the hardness of the strip steel, but also improves the toughness of the strip steel, and the time required for annealing is also significantly shortened, because the strip steel is impacted by nitrogen during annealing, the strip steel is continuously shaken during annealing, the heating efficiency of the strip steel is accelerated, the reaction efficiency of the substances in the strip steel is accelerated, and the impurities in the strip steel are removed, so that the toughness of the strip steel is improved, and the annealing time is shortened, and secondly, as compared with the examples 1-3, the hardness of the strip steel is continuously increased along with the increase of the nitrogen pressure during the impact of the strip steel, the annealing time is continuously reduced, while the roughness is firstly reduced and then increased, because of the impact of nitrogen on the strip steel, the strip steel is further hammered, thereby failing to achieve the annealing effect.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The cold-rolled strip steel annealing process is characterized by comprising the following steps of:
sealing an annealing furnace: feeding the strip steel to be annealed into an annealing furnace for sealing, and heating to 385-390 ℃;
temperature maintenance: after the annealing furnace is sealed, the temperature is raised to 700 ℃ and 750 ℃, and the strip steel is impacted by nitrogen;
air blowing: firstly, conveying 1-2% hydrogen into an annealing furnace, introducing the hydrogen for 32-35min, keeping the temperature for 8-10min, and then blowing the hydrogen with the concentration of 3-5% for 30-40 min;
primary annealing: firstly, raising the temperature in the annealing furnace to 700-720 ℃, and keeping the temperature for 2-3 h; keeping the continuous purging of the hydrogen, and keeping the temperature for 1-2h when the temperature in the annealing furnace is reduced to 600-650 ℃; when the temperature in the annealing furnace is reduced to 500-520 ℃, the temperature is kept for 30-35 min;
and (4) annealing again: after the primary annealing, the temperature in the annealing furnace is increased to 730-750 ℃, the temperature is kept for 10-20min, and then the air cooling is carried out on the strip steel in the annealing furnace;
strip steel cleaning: and (3) putting the strip steel cooled to room temperature into deionized water for ultrasonic cleaning, and putting the cleaned strip steel into a dryer for drying to obtain the cold-rolled strip steel.
2. The cold-rolled steel strip annealing process according to claim 1, characterized in that: before the annealing furnace is sealed, nitrogen is firstly conveyed into the annealing furnace at the nitrogen flow rate of 48-50L/min, and the annealing furnace is preheated at the preheating temperature of 250-280 ℃.
3. The cold-rolled steel strip annealing process according to claim 1, characterized in that: when the steel is sent into the annealing furnace, nitrogen is sent into the annealing furnace at the speed of 80-85L/min, and the temperature of the annealing furnace is simultaneously raised to 350-360 ℃.
4. The cold-rolled steel strip annealing process according to claim 1, characterized in that: when the nitrogen impacts the strip steel, the nitrogen is controlled to impact the strip steel at the pressure of 2.0-2.4 standard atmospheric pressures, the strip steel is stopped after 5-8min of impact, the strip steel is kept stand for 1-2min, and the strip steel is impacted again.
5. The cold-rolled steel strip annealing process according to claim 1, characterized in that: when blowing, the blowing flow of the hydrogen is 20-24L/min, the temperature of the hydrogen is 50-68 ℃, and the concentration of the hydrogen is the concentration of the mixed hydrogen and nitrogen.
6. The cold-rolled steel strip annealing process according to claim 1, characterized in that: in the secondary annealing, the air cooling comprises the following steps:
(1) and (3) slowly cooling: conveying nitrogen with the temperature of 700-710 ℃ into the annealing furnace, and regulating the temperature of the nitrogen at the speed of 4-5 ℃/min;
(2) and (3) rapidly cooling: when the temperature of the strip steel is reduced to 580-600 ℃, the temperature of the nitrogen is reduced at the temperature of 20-25 ℃/min;
(3) cooling: when the temperature of the strip steel is reduced to 280-300 ℃, the strip steel is taken out of the annealing furnace and is cooled to room temperature.
7. The cold-rolled steel strip annealing process according to claim 1, characterized in that: after drying, spraying and putting the coating on the surface of the strip steel, soaking the strip steel in clear oil for 1-2min, and blowing away the clear oil on the surface of the strip steel by using a fan.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4374682A (en) * | 1979-02-02 | 1983-02-22 | Nippon Steel Corporation | Process for producing deep-drawing cold rolled steel strips by short-time continuous annealing |
| US5885382A (en) * | 1995-12-26 | 1999-03-23 | Nippon Steel Corporation | Primary cooling method in continuously annealing steel strip |
| CN103276191A (en) * | 2013-06-06 | 2013-09-04 | 攀钢集团攀枝花钢钒有限公司 | Purge method for annealing of low-carbon cold-roll steel sheets |
| CN107119175A (en) * | 2017-07-04 | 2017-09-01 | 合肥市大卓电力有限责任公司 | A kind of annealing process of low-carbon cold rolling steel plate |
| CN109943701A (en) * | 2019-05-06 | 2019-06-28 | 山东理工大学 | Belching well formula Brass Pipe Annealing Stove Control nitrogen waste heat efficient utilization device |
-
2020
- 2020-09-21 CN CN202010992269.8A patent/CN112210643A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4374682A (en) * | 1979-02-02 | 1983-02-22 | Nippon Steel Corporation | Process for producing deep-drawing cold rolled steel strips by short-time continuous annealing |
| US5885382A (en) * | 1995-12-26 | 1999-03-23 | Nippon Steel Corporation | Primary cooling method in continuously annealing steel strip |
| CN103276191A (en) * | 2013-06-06 | 2013-09-04 | 攀钢集团攀枝花钢钒有限公司 | Purge method for annealing of low-carbon cold-roll steel sheets |
| CN107119175A (en) * | 2017-07-04 | 2017-09-01 | 合肥市大卓电力有限责任公司 | A kind of annealing process of low-carbon cold rolling steel plate |
| CN109943701A (en) * | 2019-05-06 | 2019-06-28 | 山东理工大学 | Belching well formula Brass Pipe Annealing Stove Control nitrogen waste heat efficient utilization device |
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