CN107937690A - A kind of heat treatment process of cold-strip steel - Google Patents
A kind of heat treatment process of cold-strip steel Download PDFInfo
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- CN107937690A CN107937690A CN201711453868.7A CN201711453868A CN107937690A CN 107937690 A CN107937690 A CN 107937690A CN 201711453868 A CN201711453868 A CN 201711453868A CN 107937690 A CN107937690 A CN 107937690A
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- strand
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- cold
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0231—Warm rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a kind of heat treatment process of cold-strip steel, include the following steps：S1, preheat tundish, and molten steel, is then poured into tundish by 1200~1250 DEG C of preheating temperature, and it is 20~60 DEG C to control the degree of superheat；S3, strand is transported to heating furnace to be heated, recrystallization temperature of the heat treatment temperature of selection less than overlay coating and the depositing temperature higher than the compound formed by nonmetalloid and overlay coating metal being deposited on crystal boundary, pre- precision processing layer is by diffusion annealing, a disperse coating is covered with after the pre- precision processing layer of diffusion annealing and is then covered with an overlay coating, overlay coating has the embrittlement of target by being heat-treated according to the nonmetallic ingredient of filling, a kind of heat treatment process of cold-strip steel provided by the invention, compared with conventional art, achieve the purpose that the Slow cooling to product, so that deformation of products amount is reduced to minimum, solve the aberration problems of product in practice.
Description
Technical field
The invention belongs to cold-strip steel technical field of heat treatment, more specifically, more particularly to a kind of heat of cold-strip steel
Treatment process.
Background technology
Cold-strip steel and thin plate general thickness are 0.1-3mm, width 100-2000mm;Using hot-strip or steel plate as
Raw material, becomes a useful person through cold rolling mill at normal temperatures.
Metal heat treatmet is one of important process in machine-building, and compared with other processing technologys, heat treatment is general not
Change the shape of workpiece and overall chemical composition, but by varying the microscopic structure of inside workpiece, or change workpiece surface
Chemical composition, assign or improve the performance of workpiece, its main feature is that improving the inherent quality of workpiece, and this is generally not meat
What eye can be seen.To make metal works that there is required mechanical property, physical property and chemical property, except reasonable selection material
Outside material and various forming technologies, heat treatment process is often essential.
Cold-strip steel is easily deformed in production, causes the aberration problems of product, improves the subsequent processing operations of product
And cost, waste of resource.
The content of the invention
The purpose of the present invention is to solve shortcoming existing in the prior art, and at a kind of heat of the cold-strip steel proposed
Science and engineering skill.
To achieve the above object, the present invention provides following technical solution：
A kind of heat treatment process of cold-strip steel, includes the following steps：
S1, preheat tundish, and molten steel, is then poured into tundish by 1200~1250 DEG C of preheating temperature, controls the degree of superheat
For 20~60 DEG C；
S2, molten steel are entered after conticaster by tundish forms strand, controls 30~55m/min of teeming speed, casting blank solidification process is adopted
With two device for cooling, two device for cooling is interior to be equipped with intensive guide roller, to control the bulge problem of strand；
S3, be transported to heating furnace by strand and heated, and the heat treatment temperature of selection is less than overlay coating
Recrystallization temperature and sinking higher than the compound formed by nonmetalloid and overlay coating metal being deposited on crystal boundary
Accumulated temperature degree, pre- precision processing layer are by diffusion annealing, and a disperse coating is covered with after the pre- precision processing layer of diffusion annealing and is connect
And be covered with an overlay coating, overlay coating has the embrittlement of target by being heat-treated according to the nonmetallic ingredient of filling；
S4, withdrawal straightening machine pull out strand, under the atmospheric condition of nitrogen, are cooled down with the speed of 40~110 DEG C/s, are in temperature
Coiling machine rolled is used at 450~650 DEG C, strand is rolled away and is descaled；
S5, batched again after the strand that oxide skin is taken out in S4 is applied Al2O3 interleaving agents, and Al2O3 interleaving agent granularities are
10~20 μm；
S6, strand volume carry out bell furnace and are heat-treated, with the speed of 50~150 DEG C/h under the conditions of nitrogen hydrogen mixed gas atmosphere
950~1150 DEG C are warming up to, 5~20h is then kept the temperature and anneals, control dew point is less than -30 DEG C；
S7, will heat treatment after strand volume again uncoiling cleaning interleaving agent after, to strand roll up carry out pickling, then further carry out again
Pickling, the acid in pickling are hydrochloric acid, then the acid of pickling is hydrochloric acid, sulfuric acid, phosphoric acid, pyrophosphoric acid, formic acid, acetic acid, citric acid, hydrogen fluorine
Acid, oxalic acid and by any one in the two or more acid mixed in these acid, wherein the temperature in pickle again is set
It is set to the pickling again carried out under conditions of 20-70 DEG C 1-30 seconds；
S8, to the strip after pickling by polishing scrub after, strip is dried and is batched；
S9 and then warm-rolling is carried out under the conditions of nitrogen atmosphere, start rolling temperature is 500~550 DEG C, and finishing temperature is 380~450
DEG C, overall reduction is 40~50%, obtains warm-rolling band；
S10, by warm-rolling band removing iron scale, subsequent strand enter roughing mill and back and forth roll 3-4 passages, obtains centre base, middle base
7-8 passages are continuously rolled into finishing mill, obtain finished product.
Preferably, the carbon content of cold-strip steel is below 0.5% in the step S3, by Ni and Co or by these elements
The pre- precision processing layer of multilayer system composition is first layed onto on cold-strip steel before overlay coating.
Preferably, the tapping temperature of strand is 1250 to 1300 DEG C in the step S3.
Preferably, in the step S10 multi-pass cold rollings, draught per pass is 3~8%.
The technique effect and advantage of the present invention：The heat treatment process of a kind of cold-strip steel provided by the invention, with traditional skill
Art is compared, and achievees the purpose that the Slow cooling to product so that deformation of products amount is reduced to minimum, solves product in practice
Aberration problems, reduce the subsequent processing operations and cost of product, save the energy, meet energy-saving state basic policy.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with specific embodiment, to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.Based on the embodiments of the present invention, those of ordinary skill in the art are not before creative work is made
All other embodiments obtained are put, belong to the scope of protection of the invention.
A kind of heat treatment process of cold-strip steel, includes the following steps：
S1, preheat tundish, and molten steel, is then poured into tundish by 1200 DEG C of preheating temperature, and it is 20 DEG C to control the degree of superheat；
S2, molten steel are entered after conticaster by tundish forms strand, controls teeming speed 30m/min, and casting blank solidification process uses two
Device for cooling, two device for cooling is interior to be equipped with intensive guide roller, to control the bulge problem of strand；
S3, be transported to heating furnace by strand and heated, and the heat treatment temperature of selection is less than overlay coating
Recrystallization temperature and sinking higher than the compound formed by nonmetalloid and overlay coating metal being deposited on crystal boundary
Accumulated temperature degree, pre- precision processing layer are by diffusion annealing, and a disperse coating is covered with after the pre- precision processing layer of diffusion annealing and is connect
And be covered with an overlay coating, overlay coating has the embrittlement of target by being heat-treated according to the nonmetallic ingredient of filling；
S4, withdrawal straightening machine pull out strand, under the atmospheric condition of nitrogen, are cooled down with the speed of 40 DEG C/s, in the case where temperature is 650 DEG C
Using coiling machine rolled, strand is rolled away and is descaled；
S5, batched again after the strand that oxide skin is taken out in S4 is applied Al2O3 interleaving agents, and Al2O3 interleaving agent granularities are
10μm；
S6, strand volume carry out bell furnace and are heat-treated, and are heated up under the conditions of nitrogen hydrogen mixed gas atmosphere with the speed of 50 DEG C/h
To 1000 DEG C, then keep the temperature 5h and anneal, control dew point is less than -30 DEG C；
S7, will heat treatment after strand volume again uncoiling cleaning interleaving agent after, to strand roll up carry out pickling, then further carry out again
Pickling, the acid in pickling are hydrochloric acid, then the acid of pickling is hydrochloric acid, sulfuric acid, phosphoric acid, pyrophosphoric acid, formic acid, acetic acid, citric acid, hydrogen fluorine
Acid, oxalic acid and by any one in the two or more acid mixed in these acid, wherein the temperature in pickle again is set
It is set to the pickling again carried out under conditions of 20-70 DEG C 1-30 seconds；
S8, to the strip after pickling by polishing scrub after, strip is dried and is batched；
S9 and then warm-rolling is carried out under the conditions of nitrogen atmosphere, start rolling temperature is 500 DEG C, and finishing temperature is 400 DEG C, overall reduction
For 40%, warm-rolling band is obtained；
S10, by warm-rolling band removing iron scale, subsequent strand enter roughing mill and back and forth roll 3-4 passages, obtains centre base, middle base
7-8 passages are continuously rolled into finishing mill, obtain finished product.
The carbon content of cold-strip steel is below 0.5% in the step S3, by Ni and Co or the polylayer forest by these elements
The pre- precision processing layer of system's composition is first layed onto on cold-strip steel before overlay coating.
The tapping temperature of strand is 1250 DEG C in the step S3.
In the step S10 multi-pass cold rollings, draught per pass 3%.
In summary：A kind of heat treatment process of cold-strip steel provided by the invention, compared with conventional art, reaches to production
The purpose of the Slow cooling of product so that deformation of products amount is reduced to minimum, solves the aberration problems of product in practice, reduces
The subsequent processing operations and cost of product, save the energy, meet energy-saving state basic policy.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used
To modify to the technical solution described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic,
Within the spirit and principles of the invention, any modification, equivalent replacement, improvement and so on, should be included in the present invention's
Within protection domain.
Claims (4)
- A kind of 1. heat treatment process of cold-strip steel, it is characterised in that：Include the following steps：S1, preheat tundish, and molten steel, is then poured into tundish by 1200~1250 DEG C of preheating temperature, controls the degree of superheat For 20~60 DEG C；S2, molten steel are entered after conticaster by tundish forms strand, controls 30~55m/min of teeming speed, casting blank solidification process is adopted With two device for cooling, two device for cooling is interior to be equipped with intensive guide roller, to control the bulge problem of strand；S3, be transported to heating furnace by strand and heated, and the heat treatment temperature of selection is less than overlay coatingRecrystallization temperature and sinking higher than the compound formed by nonmetalloid and overlay coating metal being deposited on crystal boundary Accumulated temperature degree, pre- precision processing layer are by diffusion annealing, and a disperse coating is covered with after the pre- precision processing layer of diffusion annealing and is connect And be covered with an overlay coating, overlay coating has the embrittlement of target by being heat-treated according to the nonmetallic ingredient of filling；S4, withdrawal straightening machine pull out strand, under the atmospheric condition of nitrogen, are cooled down with the speed of 40~110 DEG C/s, are in temperature Coiling machine rolled is used at 450~650 DEG C, strand is rolled away and is descaled；S5, batched again after the strand that oxide skin is taken out in S4 is applied Al2O3 interleaving agents, and Al2O3 interleaving agent granularities are 10~20 μm；S6, strand volume carry out bell furnace and are heat-treated, with the speed of 50~150 DEG C/h under the conditions of nitrogen hydrogen mixed gas atmosphere 950~1150 DEG C are warming up to, 5~20h is then kept the temperature and anneals, control dew point is less than -30 DEG C；S7, will heat treatment after strand volume again uncoiling cleaning interleaving agent after, to strand roll up carry out pickling, then further carry out again Pickling, the acid in pickling are hydrochloric acid, then the acid of pickling is hydrochloric acid, sulfuric acid, phosphoric acid, pyrophosphoric acid, formic acid, acetic acid, citric acid, hydrogen fluorine Acid, oxalic acid and by any one in the two or more acid mixed in these acid, wherein the temperature in pickle again is set It is set to the pickling again carried out under conditions of 20-70 DEG C 1-30 seconds；S8, to the strip after pickling by polishing scrub after, strip is dried and is batched；S9 and then warm-rolling is carried out under the conditions of nitrogen atmosphere, start rolling temperature is 500~550 DEG C, and finishing temperature is 380~450 DEG C, overall reduction is 40~50%, obtains warm-rolling band；S10, by warm-rolling band removing iron scale, subsequent strand enter roughing mill and back and forth roll 3-4 passages, obtains centre base, middle base 7-8 passages are continuously rolled into finishing mill, obtain finished product.
- A kind of 2. heat treatment process of cold-strip steel described in claim 1, it is characterised in that：Cold-strip steel in the step S3 Carbon content below 0.5%, by Ni and Co or the pre- precision processing layer being made of the multilayer system of these elements in overlay coating It is preceding to be first layed onto on cold-strip steel.
- A kind of 3. heat treatment process of cold-strip steel described in claim 1, it is characterised in that：Strand goes out in the step S3 Furnace temperature is 1250 to 1300 DEG C.
- A kind of 4. heat treatment process of cold-strip steel described in claim 1, it is characterised in that：The step S10 multi-pass In cold rolling, draught per pass is 3~8%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711453868.7A CN107937690A (en) | 2017-12-28 | 2017-12-28 | A kind of heat treatment process of cold-strip steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711453868.7A CN107937690A (en) | 2017-12-28 | 2017-12-28 | A kind of heat treatment process of cold-strip steel |
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| CN107937690A true CN107937690A (en) | 2018-04-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1636073A (en) * | 2001-06-21 | 2005-07-06 | 希勒及穆勒有限公司 | Heat treatment method for a cold-rolled strip with an Ni and/or Co surface coating, sheet metal producible by said method and battery can producible by said method |
| CN102199721A (en) * | 2010-03-25 | 2011-09-28 | 宝山钢铁股份有限公司 | High-silicon non-oriented cold-rolled sheet, and manufacture method thereof |
| CN102959130A (en) * | 2010-08-31 | 2013-03-06 | 杰富意钢铁株式会社 | Method for producing cold-rolled steel sheet, cold-rolled steel sheet, and vehicle member |
| CN104372238A (en) * | 2014-09-28 | 2015-02-25 | 东北大学 | Preparation method of oriented high-silicon steel |
| CN107164693A (en) * | 2017-06-01 | 2017-09-15 | 东北大学 | A kind of preparation method based on the high silicon steel cold-strip steel of thin strap continuous casting |
-
2017
- 2017-12-28 CN CN201711453868.7A patent/CN107937690A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1636073A (en) * | 2001-06-21 | 2005-07-06 | 希勒及穆勒有限公司 | Heat treatment method for a cold-rolled strip with an Ni and/or Co surface coating, sheet metal producible by said method and battery can producible by said method |
| CN102199721A (en) * | 2010-03-25 | 2011-09-28 | 宝山钢铁股份有限公司 | High-silicon non-oriented cold-rolled sheet, and manufacture method thereof |
| CN102959130A (en) * | 2010-08-31 | 2013-03-06 | 杰富意钢铁株式会社 | Method for producing cold-rolled steel sheet, cold-rolled steel sheet, and vehicle member |
| CN104372238A (en) * | 2014-09-28 | 2015-02-25 | 东北大学 | Preparation method of oriented high-silicon steel |
| CN107164693A (en) * | 2017-06-01 | 2017-09-15 | 东北大学 | A kind of preparation method based on the high silicon steel cold-strip steel of thin strap continuous casting |
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