CN103305680A - Method for producing cold-rolled sheet by means of cover annealing blowing - Google Patents
Method for producing cold-rolled sheet by means of cover annealing blowing Download PDFInfo
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- CN103305680A CN103305680A CN201310229024XA CN201310229024A CN103305680A CN 103305680 A CN103305680 A CN 103305680A CN 201310229024X A CN201310229024X A CN 201310229024XA CN 201310229024 A CN201310229024 A CN 201310229024A CN 103305680 A CN103305680 A CN 103305680A
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Abstract
The invention discloses a method for producing a cold-rolled sheet by means of cover annealing blowing. The method comprises the following steps of: carrying out continuous casting on refined molten steel to obtain a sheet blank; hot-rolling and reeling the sheet blank to obtain a hot-rolled roll, cold-rolling the hot-rolled roll to obtain a cold hard roll; feeding the non-degreased cold hard roll into a full-hydrogen cover-type annealing furnace at room temperature to carry out blowing treatment to obtain strip steel; smoothing and fast annealing the strip steel; finally smoothing and finishing the fast-annealed strip steel; and rolling the finished strip steel to obtain a finished product. According to the method for producing the cold-rolled sheet by means of cover annealing blowing, as blowing process parameters are optimized, a steel type, which is hard to weld, can have high-level surface quality in a non-degreased condition, the surface quality of the sheet can completely reach FB grade, and the surface quality of partial sheet even can meet the requirements of FC grade, so that the quality of the cold-rolled sheet can satisfy the requirements of a client.
Description
Technical field
The invention belongs to the metal material processing technical field, be specifically related to a kind of bell-type annealing that adopts and purge the method for producing cold rolled sheet.
Background technology
In cold rolled sheet is produced, at high carbon steel such as the high-strength steel more than 0.15% and structure iron, behind cleanup acid treatment and mill milling, finish annealing process in the bell furnace of being everlasting for carbon content, and do not adopt the mode of continuous annealing that coil of strip is carried out aftertreatment.Former because the bell-type annealing mode is entire volume to be processed, coil of strip need not uncoiling and namely finishes annealing process; And in continuous annealing production line, to pass each process procedure of whole production line with the form of steel, it is from beginning to end that adjacent two volumes need use the welding machine welding to realize after coil of strip need to launch through uncoiling, guarantees the continuity of producing with this.For ordinary low-carbon steel and gapless atomic steel, the intensity of weld seam is enough to pass whole production line and broken belt not, but then different for high carbon steel, because the carbon content of base material is too high, the internal stress that weld seam is larger causes weld seam to have extremely strong fragility, and welding quality can not Reliable guarantee.
The cover debatching quality on common high surface all will enter the degreasing unit and carry out degreasing before entering bell furnace, but for these hard-to-weld steel grades, generally do not go up the degreasing unit and produce (risk of broken belt is very high), although common bell-type annealing can satisfy performance requriements, because the carbonization in the residual and heat-processed of surface rolling oil often can't obtain high-grade surface quality.
Summary of the invention
The object of the present invention is to provide a kind of employing bell-type annealing that can improve the cold rolled sheet surface quality to purge the method for producing cold rolled sheet.
A kind of method that adopts bell-type annealing purge to produce cold rolled sheet provided by the invention comprises: with molten steel by refining after continuous casting acquisition slab;
Described slab is carried out coiling into hot rolled coil after the hot rolling, more described hot rolled coil is carried out the chill volume of cold rolling acquisition;
Carry out purge in the full-hydrogen hood-type annealing furnace and obtain the band steel at room temperature not entering through the chill volume of degreasing;
Described band steel is carried out smooth and short annealing;
With described eventually smooth, finishing of band steel through short annealing, then coil into finished product.
Further, described will be not at room temperature not entering through the chill volume of degreasing carries out purge and obtains the band ladle and draw together in the full-hydrogen hood-type annealing furnace:
Under the normal temperature state with described do not enter full-hydrogen hood-type annealing furnace through the chill package of degreasing after, to carrying out N in the stove
2Prepurge is with H original in the stove
2Purging is replaced into N
2Purge;
In the heat-processed, coil of strip being carried out flow at 280 ℃-520 ℃ when interval when temperature in the stove is 30m
3The H of/h
2Purge, stopping to carry out flow when temperature in the stove reaches 520 ℃ is 30m
3The H of/h
2Sweep and blow;
In the insulating process, when temperature in the stove when other are interval, keep H
2Flow is 5m
3/ h purges;
In the fast cold process, carrying out flow at 520 ℃-280 ℃ when interval when temperature in the stove is 20m
3The H of/h
2Purge, stopping flow when temperature in the stove reaches 280 ℃ is 20m
3The H of/h
2Sweep and blow, with N
2Purging is replaced into H
2Purge, be with steel to come out of the stove.
A kind of bell-type annealing that adopts provided by the invention purges the method for producing cold rolled sheet, by the purging process parameter is optimized, can realize that difficult welding steel grade is in the situation that also can obtain high-grade surface quality without degreasing, surface quality can all reach the FB level, part reaches the requirement of FC rank, can satisfy client's service requirements fully.
Embodiment
A kind of bell-type annealing that adopts provided by the invention purges the method for producing cold rolled sheet, and the chemical composition mass percent of the carbon steel of employing is: C, 0.46%; Mn, 0.70%; Si, 0.30%; P≤0.025%; S≤0.015%; Alt 〉=0.02%; Surplus is Fe and trace element, and the corrugated surface roughness is 1.0 microns.Concrete steps comprise:
A kind of bell-type annealing that adopts provided by the invention purges the method for producing cold rolled sheet, comprising:
Step S1: with molten steel by refining after continuous casting obtain the slab of mentioned component.
Step S2: described slab is carried out coiling into hot rolled coil after the hot rolling, more described hot rolled coil is carried out the chill volume of cold rolling acquisition.
Step S3: the chill volume that will not pass through degreasing at room temperature enters and carries out purge acquisition band steel in the full-hydrogen hood-type annealing furnace.
Step S4: described band steel is carried out smooth and short annealing.
Step S5: with described eventually smooth, finishing of band steel through short annealing, then coil into finished product.
Wherein, step S3 will be not at room temperature enter through the chill volume of degreasing and carries out purge in the full-hydrogen hood-type annealing furnace and obtain the band ladle and draw together:
Step S31: under the normal temperature state with described do not enter full-hydrogen hood-type annealing furnace through the chill package of degreasing after, to carrying out N in the stove
2Prepurge is with H original in the stove
2Purging is replaced into N
2Purge;
Step S32: in the heat-processed, coil of strip being carried out flow at 280 ℃-520 ℃ when interval when temperature in the stove is 30m
3The H of/h
2Purge, stopping to carry out flow when temperature in the stove reaches 520 ℃ is 30m
3The H of/h
2Sweep and blow; This temperature range is that gasify in a large number volatilization and the cracking of the coil of strip surfactant emulsion liquid that do not carry out degreasing produces the dusty gas stage in a large number, and the purging by large flow is discharged to outside the stove, so that belt steel surface cleans.Carry out again the H of large flow in the temperature more than 520 ℃
2Purging unsuitable reason is, the carbon of belt steel surface and the hydrogen compounds such as producing methane that at high temperature reacts easily occurs, and the band steel surface decarburization deliquescing easily occurs and at high temperature produces bonding defect, affects surface quality.In addition H
2A large amount of discharges also are wastes.
Step S33: in the insulating process, when temperature in the stove when other are interval, keep H
2Flow is 5m
3/ h purges; CH occurs again at 520 ℃-280 ℃ in temperature
4Contrary decomposition reaction pollute at the belt steel surface Formed, so also need certain H this moment
2Flow comes combustion gas.
Step S34: in the fast cold process, carrying out flow at 520 ℃-280 ℃ when interval when temperature in the stove is 20m
3The H of/h
2Purge, stopping flow when temperature in the stove reaches 280 ℃ is 20m
3The H of/h
2Sweep and blow, with N
2Purging is replaced into H
2Purge, be with steel to come out of the stove.The gas contamination degree of cooling stages reversed reaction is lighter than the heating phase, H
2Flow relatively also can be less, 20m
3/ h also can meet the demands.When temperature was down to below 280 ℃, the pyrolysis gasification reaction stopped H substantially
2Purging can't contribute in the Surface Quality raising.So keep minimum H under the temperature
2Flow guarantees that the pressure in the annealing atmosphere gets final product.
After above-mentioned technique, rise to the FC level without the surperficial rank of the bell-type annealing band steel of degreasing by the FB level.In the heat-processed, when temperature was 280 ℃-520 ℃ in the stove, volatilization occurs for the ROLLING OIL of belt steel surface and moisture and decomposition reaction generates CH
4With other hydrocarbons; And CH occurs 520 ℃-280 ℃ of cooling stagess
4Contrary decomposition reaction pollute at the belt steel surface Formed.Therefore will pass through H in this temperature range
2Large flow purge and realize that carbide gas discharges out of the furnace, realize the cleaning of furnace atmosphere and the cleaning of belt steel surface.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example the present invention is had been described in detail, 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 (2)
1. one kind is adopted bell-type annealing to purge the method for producing cold rolled sheet, it is characterized in that, comprising:
With molten steel by refining after continuous casting obtain slab;
Described slab is carried out coiling into hot rolled coil after the hot rolling, more described hot rolled coil is carried out the chill volume of cold rolling acquisition;
Carry out purge in the full-hydrogen hood-type annealing furnace and obtain the band steel at room temperature not entering through the chill volume of degreasing;
Described band steel is carried out smooth and short annealing;
With described eventually smooth, finishing of band steel through short annealing, then coil into finished product.
2. production method as claimed in claim 1 is characterized in that, described will be not at room temperature not entering through the chill volume of degreasing carries out purge and obtain the band ladle and draw together in the full-hydrogen hood-type annealing furnace:
Under the normal temperature state with described do not enter full-hydrogen hood-type annealing furnace through the chill package of degreasing after, to carrying out N in the stove
2Prepurge is with H original in the stove
2Purging is replaced into N
2Purge;
In the heat-processed, coil of strip being carried out flow at 280 ℃-520 ℃ when interval when temperature in the stove is 30m
3The H of/h
2Purge, stopping to carry out flow when temperature in the stove reaches 520 ℃ is 30m
3The H of/h
2Sweep and blow;
In the insulating process, when temperature in the stove when other are interval, keep H
2Flow is 5m
3/ h purges;
In the fast cold process, carrying out flow at 520 ℃-280 ℃ when interval when temperature in the stove is 20m
3The H of/h
2Purge, stopping flow when temperature in the stove reaches 280 ℃ is 20m
3The H of/h
2Sweep and blow, with N
2Purging is replaced into H
2Purge, be with steel to come out of the stove.
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| CN201310229024.XA CN103305680B (en) | 2013-06-08 | 2013-06-08 | Method for producing cold-rolled sheet by means of cover annealing blowing |
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| CN103305680B CN103305680B (en) | 2015-03-25 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757183A (en) * | 2013-12-11 | 2014-04-30 | 宝钢集团新疆八一钢铁有限公司 | Production process for improving cold rolling commercial coil black stripe defect |
| CN105154634A (en) * | 2015-05-19 | 2015-12-16 | 本钢板材股份有限公司 | Cover-type annealing furnace hydrogen use amount saving method |
| CN106670743A (en) * | 2016-12-14 | 2017-05-17 | 安徽楚江特钢有限公司 | Manufacturing method of longitudinal welded pipe of precision gas spring |
| CN107828959A (en) * | 2017-11-20 | 2018-03-23 | 山西太钢不锈钢股份有限公司 | Reduce the bell furnace method for blowing hydrogen of high-grade hot rolling yoke steel surface aberration |
| CN112553456A (en) * | 2020-12-15 | 2021-03-26 | 攀钢集团攀枝花钢钒有限公司 | Method for reducing yellow oil spot defects of bell-type furnace annealed steel coil |
| CN113416821A (en) * | 2021-06-24 | 2021-09-21 | 新疆八一钢铁股份有限公司 | Annealing process for Q235-W steel grade of spiral welded pipe |
| CN113699365A (en) * | 2021-08-19 | 2021-11-26 | 北京首钢股份有限公司 | Method for improving oxidation color defect of steel coil after cover annealing |
| CN114196810A (en) * | 2020-09-17 | 2022-03-18 | 宝山钢铁股份有限公司 | High-strength steel coil dehydrogenation method |
| CN114525382A (en) * | 2021-12-09 | 2022-05-24 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114561520A (en) * | 2022-03-04 | 2022-05-31 | 新疆八一钢铁股份有限公司 | Hydrogen-rich cyclic annealing process for cold-rolled oil drum plate |
| CN115193915A (en) * | 2022-06-13 | 2022-10-18 | 新疆八一钢铁股份有限公司 | Production process of clean steel SPCC-KJ steel grade |
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|---|---|---|---|---|
| CN103757183B (en) * | 2013-12-11 | 2015-10-28 | 宝钢集团新疆八一钢铁有限公司 | A kind of production technique improving cold rolling commercial coil black stripe defect |
| CN103757183A (en) * | 2013-12-11 | 2014-04-30 | 宝钢集团新疆八一钢铁有限公司 | Production process for improving cold rolling commercial coil black stripe defect |
| CN105154634A (en) * | 2015-05-19 | 2015-12-16 | 本钢板材股份有限公司 | Cover-type annealing furnace hydrogen use amount saving method |
| CN106670743A (en) * | 2016-12-14 | 2017-05-17 | 安徽楚江特钢有限公司 | Manufacturing method of longitudinal welded pipe of precision gas spring |
| CN106670743B (en) * | 2016-12-14 | 2019-06-11 | 安徽楚江特钢有限公司 | A kind of manufacturing method of precision gas spring straight seam welded pipe |
| CN107828959A (en) * | 2017-11-20 | 2018-03-23 | 山西太钢不锈钢股份有限公司 | Reduce the bell furnace method for blowing hydrogen of high-grade hot rolling yoke steel surface aberration |
| CN114196810B (en) * | 2020-09-17 | 2024-03-08 | 宝山钢铁股份有限公司 | Method for removing hydrogen from high-strength steel coil |
| CN114196810A (en) * | 2020-09-17 | 2022-03-18 | 宝山钢铁股份有限公司 | High-strength steel coil dehydrogenation method |
| CN112553456A (en) * | 2020-12-15 | 2021-03-26 | 攀钢集团攀枝花钢钒有限公司 | Method for reducing yellow oil spot defects of bell-type furnace annealed steel coil |
| CN113416821A (en) * | 2021-06-24 | 2021-09-21 | 新疆八一钢铁股份有限公司 | Annealing process for Q235-W steel grade of spiral welded pipe |
| CN113699365A (en) * | 2021-08-19 | 2021-11-26 | 北京首钢股份有限公司 | Method for improving oxidation color defect of steel coil after cover annealing |
| CN114525382A (en) * | 2021-12-09 | 2022-05-24 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114525382B (en) * | 2021-12-09 | 2024-04-26 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114561520A (en) * | 2022-03-04 | 2022-05-31 | 新疆八一钢铁股份有限公司 | Hydrogen-rich cyclic annealing process for cold-rolled oil drum plate |
| CN115193915A (en) * | 2022-06-13 | 2022-10-18 | 新疆八一钢铁股份有限公司 | Production process of clean steel SPCC-KJ steel grade |
| CN115193915B (en) * | 2022-06-13 | 2023-04-07 | 新疆八一钢铁股份有限公司 | Production process of clean steel SPCC-KJ steel grade |
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Application publication date: 20130918 Assignee: BEIJING SHOUGANG COLD ROLLING THIN PLATE CO., LTD. Assignor: Capital Iron & Steel General Company Contract record no.: 2015990001019 Denomination of invention: Method for producing cold-rolled sheet by means of cover annealing blowing Granted publication date: 20150325 License type: Common License Record date: 20151209 |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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