CN100513591C - Annealing process of a stainless steel band - Google Patents

Annealing process of a stainless steel band Download PDF

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Publication number
CN100513591C
CN100513591C CNB2005101363836A CN200510136383A CN100513591C CN 100513591 C CN100513591 C CN 100513591C CN B2005101363836 A CNB2005101363836 A CN B2005101363836A CN 200510136383 A CN200510136383 A CN 200510136383A CN 100513591 C CN100513591 C CN 100513591C
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Prior art keywords
stainless steel
steel band
annealing
roughness
roll
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CNB2005101363836A
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CN1800420A (en
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A·马沙尔
F·布尔东
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DMS SA
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DMS SA
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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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—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
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing

Abstract

The method (4) for annealing the stainless steel sheet comprises: performing at least one rolling step; and performing typically continuously at least a step (2) of heating the stainless steel sheet in a reductive atmosphere, a step (2) of cooling the stainless steel sheet and a step (23) of transpripting roughness onto the surface of the stainless steel sheet. The apparatus (4) for annealing the stainless steel sheet comprises: a means (2) for heating the stainless steel sheet in the reductive atmosphere; a means (2) for cooling the stainless steel sheet; and a means (23) for transcripting the roughness onto the surface of the stainless steel sheet.

Description

The annealing process of Stainless Steel Band
Technical field
The present invention relates to a kind of annealing process of Stainless Steel Band.
Background technology
In metal industry, well-known, in order to make sheet coil, metal will carry out once or cold rolling step several times.
In order to realize this point, metal strip is by a pre-determined path, and is rolling to reduce its thickness between two rolls.
Therefore, material generation sclerosis and its ductility of further loss are to bear high load.
In order to reprocess metal strip, method for annealing is known, and this method is to make material return to steady state, thereby makes material that its ductility take place to soften and recover subsequently.
So, can pick out two kinds of annealing types, promptly so-called process annealing and so-called final annealing.
For the sheet metal thickness that obtains to require, stainless steel strip often need carry out several times successive cold rolling step.In this case, Stainless Steel Band circulates to pass several times between roll along closed hoop.
Yet after each program of passing between described roll, metal strip should be softened to implement a new program: it is process annealing.
Through after the last cold rolling step, metal sheet or stainless steel strip should soften and have flawless facing to be suitable for sale: it is a final annealing.
Should be understood that the final product quality that obtains is not necessarily identical with final annealing after intermediate annealing process.A thereby known appropriate means: annealing is also passed through the chemical reagent etching.
Final annealing also can be level and smooth annealing, promptly described annealing-etching.
Level and smooth annealing is in the box-type furnace of sealing and by N 2Account for 25% H at most 2/ N 2Mixture, even may be pure H 2Implement in the non-oxidizable controlled atmosphere of forming.
Use resistance furnace, pneumatic retort furnace traditionally, or realize in conjunction with the hydride stove of above two technology.
Level and smooth annealing can realize that again it can directly improve the temperature of described band by the method for transverse flux induction heating.
Usually, there is at least one pair of roll the stove back, and its outer wall polishes as mirror, and promptly so-called " rolling surface (pass skin) " can carry out surface rolling to described band.
The effect of above-mentioned level and smooth annealing process is fine, and can make the final product quality of sheet metal reach the defined BA level of international metal standard.
However, because the roughness of final product quality is too little, to such an extent as to the described sheet metal of punching press easily afterwards.In fact, the sliding surface of peace is not suitable for punching press.
In this case, handle steel band by annealing-etching technics, it is known making its enough surfaceness that can obtain to be easier to punching press.
Then, in open box-type furnace, anneal.Oxygen level is controlled between the 3-6% according to Steel Grade.Owing to there is oxidizing atmosphere, handle by chemical etching that to remove zone of oxidation be necessary, be referred to as to derust.
This chemical treatment may be gaseous state or liquid effluent according to handling the different different chemical substances, generation used of Steel Grade.
For example known chemical substance can be:
---be used as the sodium sulfate of the electrolytic bath of AISI300 and AISI400, yet this solution produces Cr 0+
---be used for the nitric acid (HNO of passivation AISI400 3), yet reaction produces nitrate;
---a kind of by hydrofluoric acid (HF) and nitric acid (HNO 3) mixing acid formed, yet this reaction produces NO XCigarette (yellow), nitrate and fluorochemical.
Last in this etch step, final product quality is the said 2D of international metal standard.Then, the sheet metal band can pass to obtain little roughness between two polishing minute surface rolls and carry out minimum extension simultaneously.
After this step, final product quality is so-called 2B.Yet, should be appreciated that the chemical substance that etching is essential and in order to use them especially heats chemical bath and electrolytic energy, and remove and pollute the processing list of being taked and understand huge operating cost.
Should be noted that the annealing of known applied chemistry reagent and throughput that etching technics has are usually between 180,000 tons/year to 230,000 tons/year scopes.The level and smooth annealing of using traditional burner to carry out itself has the less throughput between 60,000 tons/year to 100,000 tons/year scopes.
Summary of the invention
The purpose of this invention is to provide a kind of method and annealing device, remedying above-mentioned shortcoming, and avoid using chemical reagent significantly.
Another object of the present invention provides the final annealing technology of the Stainless Steel Band of a kind of 2D of being equivalent to and 2B quality, and it allows to carry out later punching operation.
Other purpose and advantage of the present invention will illustrate in the following description, only provide as embodiment but be not limited thereto.
The present invention at first relates to the annealing process of the Stainless Steel Band after at least breaking down step, wherein carries out following steps at least, especially successively:
---the described Stainless Steel Band of heating under reducing atmosphere,
---cool off described Stainless Steel Band,
---on the surface of described Stainless Steel Band, extrude roughness.
The invention still further relates to a kind of annealing device of realizing this method, comprising:
---the device of the described Stainless Steel Band of heating in reducing atmosphere,
---cool off the device of described Stainless Steel Band,
---on the surface of described Stainless Steel Band, extrude the device of roughness.
Description of drawings
After having read specification sheets and accompanying drawing, will better understand invention, wherein:
Fig. 1 is that width of cloth description comprises that especially the chemical reagent of using prior art is annealed and the synoptic diagram of the cold rolling process of etch step.
Fig. 2 is the synoptic diagram that a width of cloth is described the cold rolling process of the final level and smooth annealing process that comprises prior art.
Fig. 3 is the synoptic diagram that a width of cloth is described the cold rolling process that comprises annealing process of the present invention.
Fig. 1 has described cold rolling process 1, comprises the annealing technology of prior art, and comprises first annealing and change Learn reagent etch step 20. As described, the quality of the stainless steel band after finishing this step is international The described 2D of metal standard.
Then, stainless steel band especially carries out the surface rolling step by polishing minute surface roll 21 by equipment. Quality at the stainless steel band in this step exit is the described 2B of international metal standard.
The annealing technology 20 that is formed by annealing and etch step can consist of intermediate annealing process. In fact, gold The genus band can be gone along sealed circuit and several times pass roll until obtain the tape thickness of requirement.
Fig. 2 has schematically described the final annealing steps that comprises level and smooth annealing type known in the state of the art Cold rolling process. In level and smooth annealing, should be noted that chemical treatment is dispensable. Advantageously, at each Dew point in the level and smooth annealing stove should be as far as possible low.
Embodiment
Nowadays, three kinds of technologies can be applicable to level and smooth annealing furnace, all show vertical design:
---by the resistive heating tile stove: it is a kind of old-fashioned design with very little handiness and high dew point.The throughput maximum of this stove reaches per hour 15 tons.
---the hot retort furnace type of gas stove: it is the most reliable stove.Yet, because its retort furnace length is limited to 26-27 rice, so their throughput is limited to per hour 10 tons.
---synthesis (the mixed fours): it is that maximum productivity is the complex combination of above-mentioned two kinds of designs of per hour 12-13 ton.
The transverse flux induction heater also is known.The main advantage of induction heating is their high electric throughput and can reaches the high surface energy of the appropriate temperature of described band as quickly as possible.
According to the present invention, level and smooth annealed principle is suitable for providing the method that is equivalent to the product that obtains in the annealing-etching of applied chemistry reagent.
Therefore, the present invention relates to formerly to carry out the annealing process 4 that Stainless Steel Band carried out after the breaking down step, wherein carry out following steps at least, do not consider order:
---the described Stainless Steel Band of heating under reducing atmosphere,
---on the surface of described Stainless Steel Band, extrude roughness.
According to an embodiment, Stainless Steel Band is cooled off after heating effectively.
According to an embodiment, implement following steps, especially successively:
---the described Stainless Steel Band of heating under reducing atmosphere,
---cool off described Stainless Steel Band, particularly under reducing atmosphere,
---on the surface of described Stainless Steel Band, extrude roughness.
Reducing atmosphere especially may account for 25% N at most by comprising 2H 2/ N 2Mixture forms or may be by pure H 2Form.
According to different variants, heat by gas control stove, resistor or with vertical or horizontal flux sensing heating technique.
The heating zone of described band vertically is installed.
Advantageously, described steel band cools off by the circulation reducing gas.
This method can reach the remarkable throughput more than 200,000 tons/year.Thereby, will implement to have the heating and the cooling fast of heating efficiency that reaches the 1000000 W/m2 orders of magnitude and the speed of cooling that reaches the 100 ℃/s order of magnitude.
Advantageously, extrude roughness by surface rolling and cause the extension that Stainless Steel Band is very little.
According to an embodiment, extrude enough roughness so that Stainless Steel Band is easier to punching press by surface rolling.
According to an embodiment, the quality that the roughness of extrusion is equivalent to international metal standard code is the stainless steel roughness of 2D.This stainless steel quality especially can obtain by the prior art method for annealing that utilizes annealing and etching technics.
According to another embodiment, the quality that the roughness of extrusion is equivalent to international metal standard code is the stainless roughness of 2B.The quality of this steel can add that especially the surface rolling step of using polishing minute surface roll obtains by method for annealing, the utilization annealing-etch step of prior art.
The invention still further relates to a kind of annealing device of realizing this method, this equipment comprises:
---the device 2 of the described Stainless Steel Band of heating in reducing atmosphere,
---cool off the device 2 of described Stainless Steel Band,
---on the surface of described Stainless Steel Band, extrude the device 23 of roughness.
On the surface of described Stainless Steel Band, extrude the device of roughness by comprising that at least one pair of rolling equipment with roll of uneven surface forms.
According to an embodiment, heating unit is formed by the shaft furnace 2 with induction heating device.
According to an embodiment, shaft furnace 2 comprises following all or part of element:
---the inlet seal device,
---control and measurement Stainless Steel Band tensile device,
---regulate Stainless Steel Band tensile drive unit,
---the transverse flux induction heating device,
---refrigerating unit,
---the exit seal device.
Induction heating device advantageously is made up of two volumes that are parallel to described steel band, and can produce the magnetic field of crossing described steel band.It can be heated to Stainless Steel Band 1,200 ℃.
Refrigerating unit can quicken the reduction of described band temperature.Especially, these refrigerating units are forms of gas-recycling plant.Advantageously, circulation cold gas is non-oxidizable.
Advantageously, refrigerating unit can be to be equal to or greater than the speed cooling of 100 ℃/s.
According to an embodiment, described equipment also has the drive unit of the pressure of the device of measurement Stainless Steel Band roughness and/or the roll that control has uneven surface.
As the description of Fig. 3, rolling facility comprises cold roll 1 and annealing device of the present invention, by transvercal induction shaft furnace 2 with comprise that the surface rolling equipment of at least one pair of roll with uneven surface 23 forms.
Advantageously, annealing device is positioned at the downstream of described roll 1.Stainless Steel Band also can pass through closed loop 22 ', it allows described band several times to pass between the roll 1.
After passing the roll 23 with uneven surface, the quality of described Stainless Steel Band is called as 2B +(this quality is equivalent to anneal traditionally-quality 2B that etching technics obtained).
This annealing process has a special applications on rolling technology, as the intermediate annealing process of Stainless Steel Band ductility for softener material and as described in recovering.
This annealing process has Another application on rolling technology, as final annealing technology.Especially, it will be as the final annealing technology as Stainless Steel Band to be punched.Stainless steel through this annealing process specifically has two types, i.e. AISI300 or AISI400.
Quality by tradition annealing and etching technics acquisition is that stainless steel AISI300 and the quality of 2B is 2B +Stainless steel AISI300 between the key distinction be under the 2B situation to be the oyster white outward appearance, at 2B +Situation is next to be unpolished grey.
Annealing process of the present invention can have significant rate of rise in temperature and high energy output.
Method of the present invention can avoid using the chemical reagent of contaminative.Therefore, this annealing process is favourable from the angle of ecology.
Advantageously, the rolling facility that provides can be modular, and can assemble coarse roll or polishing minute surface roll according to purposes.Therefore, roll will be dismountable to change according to purposes.
Therefore, as the description of Fig. 3, this facility has assembled the surface rolling equipment that comprises at least one pair of roll with uneven surface 23, and it can locate to obtain quality in outlet 23 ' is 2B +Stainless Steel Band.
Wish to replace roll 23, thereby locate to obtain the steel that quality is BA in outlet 21 ' with uneven surface with polishing minute surface roll 21.
In addition, when annealing only is process annealing and steel band when closed loop 22 ' is carried out a new rolling shedule 1, steel band can not carry out any surface rolling, and the roll 23 or the polishing minute surface roll 21 that especially have uneven surface can be opened simply.
Clearly, can expect the embodiment that also exists other it will be appreciated by those skilled in the art that without departing from the present invention.

Claims (1)

1, a kind of annealing process of Stainless Steel Band carries out after carrying out a breaking down step at least, wherein carries out following steps at least:
---the described Stainless Steel Band of heating under reducing atmosphere, wherein heating relies on the transverse flux induction installation to carry out,
---cool off described Stainless Steel Band, wherein said Stainless Steel Band cools off by the circulation reducing gas, and with the speed cooling more than or equal to 100 ℃/s,
---extrude roughness on the surface of described Stainless Steel Band, wherein the roughness of Ya Chuing is equivalent to the stainless roughness that the quality of international metal standard definition is 2B.
CNB2005101363836A 2004-12-13 2005-12-13 Annealing process of a stainless steel band Active CN100513591C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR04/13221 2004-12-13
FR0413221A FR2879216B1 (en) 2004-12-13 2004-12-13 METHOD FOR REINFORCING A STAINLESS STEEL STRIP

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CN1800420A CN1800420A (en) 2006-07-12
CN100513591C true CN100513591C (en) 2009-07-15

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US (1) US20060124210A1 (en)
EP (1) EP1669465B1 (en)
JP (1) JP2006176877A (en)
CN (1) CN100513591C (en)
AT (1) ATE429520T1 (en)
BR (1) BRPI0505369A (en)
DE (1) DE602005014069D1 (en)
ES (1) ES2326378T3 (en)
FR (1) FR2879216B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008010062A1 (en) * 2007-06-22 2008-12-24 Sms Demag Ag Process for hot rolling and heat treatment of a strip of steel
CN102140574B (en) * 2011-05-11 2012-09-05 北京冶金正源科技有限公司 Annealing process for improving deep drawability of 430 ferrite stainless steel

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BRPI0505369A (en) 2006-09-12
US20060124210A1 (en) 2006-06-15
EP1669465A3 (en) 2007-07-11
FR2879216A1 (en) 2006-06-16
FR2879216B1 (en) 2007-04-20
DE602005014069D1 (en) 2009-06-04
ATE429520T1 (en) 2009-05-15
ES2326378T3 (en) 2009-10-08
JP2006176877A (en) 2006-07-06
CN1800420A (en) 2006-07-12
EP1669465B1 (en) 2009-04-22
EP1669465A2 (en) 2006-06-14

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