CN101722213A - Straightening process of high-strength steel plate - Google Patents
Straightening process of high-strength steel plate Download PDFInfo
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- CN101722213A CN101722213A CN200910234377A CN200910234377A CN101722213A CN 101722213 A CN101722213 A CN 101722213A CN 200910234377 A CN200910234377 A CN 200910234377A CN 200910234377 A CN200910234377 A CN 200910234377A CN 101722213 A CN101722213 A CN 101722213A
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Abstract
The invention discloses a straightening process of a high-strength steel plate, which is used for straightening shape defects at the head and the tail of the high-strength steel plate by utilizing the traditional online strengthening device. The straightening process comprises the following steps of: putting a part to be straightened at the head of the high-strength steel plate in a roll system of a straightener when the steel plate is automatically nipped into the straightener, pressing a straightening roll-gap by adopting a static-pressure delay method to reach the appropriate pressure, and opening the roll-gap to a normal straightening position to be straightened after a period time of static-pressure delay, wherein the pressure of a single cylinder of the straightener is not less than 370t, and the static-pressure delay is 3 to 6s; and opening the roll-gap till the high-strength steel plate is departed from the straightener by adopting the same static-pressure delay method when the a part to be straightened at the tail of the high-strength steel plate enters into the roll system of the straightener. By utilizing the traditional straightening device, the invention solves the straightening shape problem of the high-strength steel plate by adopting the straightening static-pressure delay process, improves the first-time pass percent of the steel plate with the pass percent more than 95 percent, and increases the benefits.
Description
Technical field:
The present invention relates to a kind of thermal straightening technology, a kind of specifically straightening process that carries out high strength steel plate with thermal straightening machine.
Background technology:
At present, each Heavy Plate Plant all exists very big problem to head, the tail shape control of high strength steel plate in the world, mainly is that head and afterbody are the phenomenon of " ligulate ".Present existing method for aligning has following several:
1), steel plate in entering thermal straightening back and forth return strongly, the shortcoming of this aligning can not effectively solve high strength steel plate nose shape problem, and makes the steel plate internal stress constantly increase.Cause steel plate the phenomenon of " secondary wooden dipper song " to occur.
2), adopt two straighteners to align, a straightener carries out slightly rectifying before laminar flow, straightener carries out essence behind laminar flow strong, the shortcoming of this aligning: though effectively reduce the head problem of high-strength plate, but required cost is higher, and the place is bigger, and equipment failure rate is higher.
3), the steel plate of wooden dipper song is carried out the cold leveling of off-line, the shortcoming of existence: because steel plate cools off, so the straightening force of required straightener is very high, and need be longer to the time cycle that steel plate is transported, the encashment ratio of very difficult contract of guarantee, cost is higher;
Summary of the invention
At yield strength surpass the high strength steel plate of 500Mpa can't leveling the problem of portion end to end, the technology that the purpose of this invention is to provide a kind of high strength steel plate aligning, this technology utilization has equipment for straightening now, the technology of taking to align the static pressure time-delay solves the plate shape problem that high strength steel plate is aligned, improve the aligning first-time qualification rate of steel plate, qualification rate can reach more than 95%, has improved benefit.
The objective of the invention is to be achieved through the following technical solutions:
A kind of straightening process of high strength steel plate is characterized in that this technology utilization has on-line straightening equipment now the flatness defect end to end of high strength steel plate is aligned, and concrete steps are as follows:
1) after steel plate is nipped straightener automatically, the head of high strength steel plate position to be aligned is positioned in the roller system of straightener, take the static pressure time-delay method, being about to align roll gap presses down, reach suitable pressure, static pressure opened to normal aligning position with roll gap and aligns after time-delay a period of time; The pressure of the single cylinder of described straightener is not less than 370t, and the static pressure time-delay is 3～6 seconds;
2) when the afterbody of high strength steel plate position to be aligned enters in the roller system of straightener, take the static pressure time-delay method equally, be about to align roll gap and press down, reach suitable pressure, static pressure is after time-delay a period of time, open roll gap extremely high-strength steel plate leave straightener; The pressure of the single cylinder of described straightener is not less than 370t, and the static pressure time-delay is 3～6 seconds.
Among the present invention, in the step 1), steel plate is nipped the temperature of straightener automatically at 480～550 ℃.
The present invention opens the high-strength plate flatness defect position of aligning to smoothing roll system after steel plate is nipped straightener automatically, will align roll gap and press down, and reaches suitable pressure.Static pressure time-delay a period of time, roll gap is opened to normal aligning position align.After taking the static pressure time-delay method equally when aligning, open roll gap and leave straightener to aligning roll gap to afterbody flatness defect position.
Advantage of the present invention is: the present invention can effectively solve the plate shape problem of high strength steel plate aligning on the one hand to high-strength plate plate shape and static pressure end to end by straightener, improve the aligning first-time qualification rate of steel plate, reduce because unplanned product and the waste product that high-strength plate plate shape problem causes.Also can reduce because transhipment that plate shape problem causes and secondary aligning expense are increased the benefit and the contract encashment ratio greatly.By above method the aligning first-time qualification rate of high strength steel plate is reached more than 95%, need not extra investment.
The specific embodiment
A kind of straightening process of high strength steel plate of the present invention, the existing on-line straightening equipment of this technology utilization is aligned the flatness defect end to end of high strength steel plate.X70 pipe line steel steel plate with 21mm is an example, and concrete straightening process step is as follows:
1., steel plate is by signal trace, the roll gap of straightener adopts and presets, the steel plate straightener of nipping automatically, steel plate return red temperature at 480～550 ℃;
2., after steel plate head is by straightener, immediately steel plate head " tongue type " position is manually opened to straightener roll gap center;
3., the manual depression roll gap makes the pressure of single cylinder be not less than 370t, static pressure 3～6 seconds;
4., manually roll gap is opened pressure is reduced to about single cylinder 280t, manually drive capable straightener aligning into;
5., when aligning steel plate to afterbody, soon align roll gap and press down, make the pressure of single cylinder be not less than 370t, static pressure 3～6 seconds; After repeating the static pressure process of head aligning, leave straightener after pressure reduced to single cylinder 200t.
The present invention need not extra investment, can effectively solve the plate shape problem of high strength steel plate aligning on the one hand to high-strength plate plate shape and static pressure end to end by existing straightener, reduce because unplanned product and the waste product that high-strength plate plate shape problem causes reaches more than 95% the aligning first-time qualification rate of high strength steel plate.Also can reduce simultaneously because transhipment that plate shape problem causes and secondary aligning expense are increased the benefit and the contract encashment ratio greatly.
Claims (2)
1. the straightening process of a high strength steel plate is characterized in that this technology utilization has on-line straightening equipment now the flatness defect end to end of high strength steel plate is aligned, and concrete steps are as follows:
1) after steel plate is nipped straightener automatically, the head of high strength steel plate position to be aligned is positioned in the roller system of straightener, take the static pressure time-delay method, being about to align roll gap presses down, reach suitable pressure, static pressure opened to normal aligning position with roll gap and aligns after time-delay a period of time; The pressure of the single cylinder of described straightener is not less than 370t, and the static pressure time-delay is 3～6 seconds;
2) when the afterbody of high strength steel plate position to be aligned enters in the roller system of straightener, take the static pressure time-delay method equally, be about to align roll gap and press down, reach suitable pressure, static pressure is after time-delay a period of time, open roll gap extremely high-strength steel plate leave straightener; The pressure of the single cylinder of described straightener is not less than 370t, and the static pressure time-delay is 3～6 seconds.
2. the straightening process of high strength steel plate according to claim 1 is characterized in that: in the step 1), steel plate is nipped the temperature of straightener automatically at 480～550 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102343772A CN101722213B (en) | 2009-11-25 | 2009-11-25 | Straightening process of high-strength steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102343772A CN101722213B (en) | 2009-11-25 | 2009-11-25 | Straightening process of high-strength steel plate |
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| Publication Number | Publication Date |
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| CN101722213A true CN101722213A (en) | 2010-06-09 |
| CN101722213B CN101722213B (en) | 2011-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102343772A Expired - Fee Related CN101722213B (en) | 2009-11-25 | 2009-11-25 | Straightening process of high-strength steel plate |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733308B (en) * | 2008-11-17 | 2012-02-01 | 鞍钢股份有限公司 | Protection method of straightening force of inlet and outlet of hot straightening machine |
| CN102974623A (en) * | 2012-12-05 | 2013-03-20 | 南京钢铁股份有限公司 | Pre-straightening method for realizing plate shape control on medium and thick plates |
| CN104001757A (en) * | 2014-05-23 | 2014-08-27 | 南京钢铁股份有限公司 | Cold straightening process for high-strength thin plate |
| CN104772367A (en) * | 2014-01-10 | 2015-07-15 | 宝山钢铁股份有限公司 | Rapid thick plate straightening method |
| CN104772367B (en) * | 2014-01-10 | 2016-11-30 | 宝山钢铁股份有限公司 | The quick method for aligning of slab |
| CN106540994A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | A kind of method for improving 21mm thickness X70 pipe line steel plate shapes |
| CN110773593A (en) * | 2019-09-20 | 2020-02-11 | 南京钢铁股份有限公司 | Composite board shape correcting method |
| CN112317539A (en) * | 2020-09-24 | 2021-02-05 | 南京钢铁股份有限公司 | Method for reducing occurrence rate of re-straightening buckling of steel plate |
| CN113333504A (en) * | 2021-05-28 | 2021-09-03 | 宝钢湛江钢铁有限公司 | Method for optimizing roll gap at tail part of steel plate of pre-straightening machine |
-
2009
- 2009-11-25 CN CN2009102343772A patent/CN101722213B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733308B (en) * | 2008-11-17 | 2012-02-01 | 鞍钢股份有限公司 | Protection method of straightening force of inlet and outlet of hot straightening machine |
| CN102974623A (en) * | 2012-12-05 | 2013-03-20 | 南京钢铁股份有限公司 | Pre-straightening method for realizing plate shape control on medium and thick plates |
| CN104772367A (en) * | 2014-01-10 | 2015-07-15 | 宝山钢铁股份有限公司 | Rapid thick plate straightening method |
| CN104772367B (en) * | 2014-01-10 | 2016-11-30 | 宝山钢铁股份有限公司 | The quick method for aligning of slab |
| CN104001757A (en) * | 2014-05-23 | 2014-08-27 | 南京钢铁股份有限公司 | Cold straightening process for high-strength thin plate |
| CN106540994A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | A kind of method for improving 21mm thickness X70 pipe line steel plate shapes |
| CN110773593A (en) * | 2019-09-20 | 2020-02-11 | 南京钢铁股份有限公司 | Composite board shape correcting method |
| CN112317539A (en) * | 2020-09-24 | 2021-02-05 | 南京钢铁股份有限公司 | Method for reducing occurrence rate of re-straightening buckling of steel plate |
| CN113333504A (en) * | 2021-05-28 | 2021-09-03 | 宝钢湛江钢铁有限公司 | Method for optimizing roll gap at tail part of steel plate of pre-straightening machine |
| CN113333504B (en) * | 2021-05-28 | 2022-03-18 | 宝钢湛江钢铁有限公司 | Method for optimizing roll gap at tail part of steel plate of pre-straightening machine |
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| Publication number | Publication date |
|---|---|
| CN101722213B (en) | 2011-05-25 |
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