CN101550477B - Low-carbon steel cold rolled sheet continuous annealing process - Google Patents
Low-carbon steel cold rolled sheet continuous annealing process Download PDFInfo
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- CN101550477B CN101550477B CN2009103012387A CN200910301238A CN101550477B CN 101550477 B CN101550477 B CN 101550477B CN 2009103012387 A CN2009103012387 A CN 2009103012387A CN 200910301238 A CN200910301238 A CN 200910301238A CN 101550477 B CN101550477 B CN 101550477B
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- continuous annealing
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Abstract
The invention relates to a low-carbon steel continuous annealing process, whose the character includes the following steps: a) entering the heating stove with the temperature of 750 Celsius system to 800 Celsius system for rapid heating for 206 to 410 seconds, b) entering the heating stove with the temperature of 850 Celsius system to 900 Celsius system for further heating for 56 to 110 seconds, c) enter the non-oxidability ambience constituted by H2N2 for cooling down 55-130 seconds to 100 Celsius system, d) entering the water cooling section with the water as heat-eliminating medium for cooling down 5-20 seconds to room temperature. The invention provides a low-carbon steel cold rolled sheet continuous annealing process, which improves the property of low-carbon steel after anneal, and the process has the advantage of simple process and low construction cost of process equipment.
Description
Technical field
The present invention relates to a kind of soft steel continuous annealing method.
Background technology
So far industrialization low-carbon steel cold rolled sheet annealing mainly contains cover annealing and two kinds of methods of continuous annealing furnace annealing, and the former is the discontinuous production of discontinuous, and the annealing cycle is longer, though the latter is a continuous production, the annealing cycle is shorter, and facility investment is bigger.Before the present patent application, the open No.S55-6469 of Japanese Patent has proposed a kind of Dualpurpose installation of continuous annealing and hot dip process that utilizes and has carried out continuous annealing method, when the steel sheet of production continuous annealing, the steel sheet temperature of coming out from continuous annealing furnace is higher, cooling is in atmosphere, thereby has the problem of surface of thin steel sheet oxidation.Application number is that 01815331.3 Japanese Patent has proposed a kind of Dualpurpose installation of continuous annealing and hot dip process that utilizes and carries out continuous annealing method, when the steel sheet of production continuous annealing, the high temperature steel sheet that from continuous annealing furnace, comes out, guide in the coating bath and cool off by a shunting device is set, rather than in atmosphere, cool off, for the steel sheet that prevents to come out from annealing furnace is exposed to outside atmosphere and oxidized, its shunting device is airtight, and inner 5%～10% the H that remains full of
2With 95%～90% N
2The non-oxidizing atmosphere of forming, its weak point is that the steel billet temperature that comes out is higher from annealing furnace, it is hard partially directly to enter in the tank after the shrend steel plate, easy to crack in the reprocessing use, and shunting device will be full of H
2And N
2The non-oxidizing atmosphere of forming, technology are complicated and dangerous.
Summary of the invention
Technical problem to be solved by this invention provides a kind of low-carbon steel cold rolled sheet continuous annealing process, overcomes existing cooling technology and has surface of thin steel sheet oxidation or the hard partially problem of the direct shrend intensity of high temperature steel plate.
For solving the problems of the technologies described above, the present invention proposes a kind of low-carbon steel cold rolled sheet continuous annealing process, it is characterized in that, may further comprise the steps:
A, to enter temperature be 750 ℃～800 ℃ process furnace rapid heating, and be 206～410 seconds heat-up time;
B, to enter temperature be that 850 ℃～900 ℃ process furnace further heats, and be 56～110 seconds heat-up time;
C, to enter medium be H
2And N
2In the non-oxidizing atmosphere of forming, be cooled to 100 ℃～150 ℃ second through 55-130;
D, enter the cooling section that heat-eliminating medium is a water, be cooled to room temperature through 5～20 seconds.
Low-carbon steel cold rolled sheet continuous annealing process provided by the invention improved performance after the annealing of soft steel, and present method technological process is simple, and the processing unit laid down cost that is relied on is low.
Description of drawings
Below in conjunction with specification drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the processing unit synoptic diagram that adopts the present invention to carry out Mild Carbon Steel Strip continuous annealing.
Embodiment
Processing unit as shown in Figure 1 can compatible continuous hot galvanizing and continuous annealing process.When the soft steel cold-rolled steel strip continuous annealing produced, band steel 1 enters in the heating zone 2,750 ℃～800 ℃ of heating zone 2 furnace temperature, and be 206～410 seconds heat-up time, band steel 1 is in heating zone 2 rapid heating.Under the transmission of band steel transfer roller, enter soaking zone 3 then and further heat, 850 ℃～900 ℃ of soaking zone 3 furnace temperature, be 56～110 seconds heat-up time, at soaking zone 3 by soaking.Enter cooling section 4 then through 55～130 seconds, be quickly cooled to 100 ℃～150 ℃, cooling section 4 heat-eliminating mediums are H
2And N
2The non-oxidizing atmosphere of forming.Band steel 1 behind thermotension roller chamber 5, outlet stove nose 6, is directly introduced in the plating postcooling section 9 by shunting device 7 again, further is cooled to room temperature through 5～20 seconds times, and does not pass through zinc pot 8, and plating postcooling section 9 heat-eliminating mediums is water.For the steel band of different thickness specification, its time at each operation stage can be different.
Embodiment
The present invention is directed to typical chemical ingredients by weight the percentage ratio test steel of counting C:0.062, Si:0.02, Mn:0.30, P:0.015, S:0.009 carry out the continuous annealing test, test processing parameter and test-results as shown in Table 1 and Table 2:
Table 1 continuous annealing test of the present invention processing parameter
Table 2 performance test result
| Thickness of strips/mm | R eL/MPa | R m/MPa | A 50/％ |
| 1.5 | 250 | 360 | 41 |
| 0.8 | 230 | 370 | 39 |
| 0.3 | 260 | 380 | 38 |
As can be seen from Table 2, through the test of table 1 continuous annealing test processing parameter, the band rigidity of gained can be better than the resulting band rigidity of prior art energy, wherein yield strength R
ELReduce 20MPa～30MPa, tensile strength R
mImproved 10%, elongation A
50Also be better than existing general 35%～37% elongation.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (1)
1. a low-carbon steel cold rolled sheet continuous annealing process is characterized in that, may further comprise the steps:
A, to enter temperature be 750 ℃～800 ℃ process furnace rapid heating, and be 206～410 seconds heat-up time;
B, to enter temperature be that 850 ℃～900 ℃ process furnace further heats, and be 56～110 seconds heat-up time;
C, to enter medium be H
2And N
2In the non-oxidizing atmosphere of forming, be cooled to 100 ℃～150 ℃ through 55～130 seconds;
D, enter the cooling section that heat-eliminating medium is a water, be cooled to room temperature through 5～20 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103012387A CN101550477B (en) | 2009-03-31 | 2009-03-31 | Low-carbon steel cold rolled sheet continuous annealing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103012387A CN101550477B (en) | 2009-03-31 | 2009-03-31 | Low-carbon steel cold rolled sheet continuous annealing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101550477A CN101550477A (en) | 2009-10-07 |
| CN101550477B true CN101550477B (en) | 2010-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103012387A Expired - Fee Related CN101550477B (en) | 2009-03-31 | 2009-03-31 | Low-carbon steel cold rolled sheet continuous annealing process |
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| CN (1) | CN101550477B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103993150B (en) * | 2014-05-30 | 2016-09-14 | 广东华冠新型材料有限公司 | A kind of production technology of hot-dip aluminizing zincium steel plate |
| CN105648178B (en) * | 2016-03-07 | 2018-02-13 | 首钢京唐钢铁联合有限责任公司 | A kind of cold rolled continuous annealing process dual phase steel oxidation tint control method |
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2009
- 2009-03-31 CN CN2009103012387A patent/CN101550477B/en not_active Expired - Fee Related
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| CN101550477A (en) | 2009-10-07 |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20101110 Termination date: 20170331 |