CN102943200B - Method for producing low-carbon thin pickling steel with yield ratio less than or equal to 0.8 through CSP (cast steel plate) process - Google Patents
Method for producing low-carbon thin pickling steel with yield ratio less than or equal to 0.8 through CSP (cast steel plate) process Download PDFInfo
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Abstract
The invention relates to a method for producing a low-carbon thin pickling steel with a yield ratio less than or equal to 0.8 through a CSP (cast steel plate) process. The method comprises the steps of smelting and continuously casting to form a blank; rolling the cast blank at temperature of 1150-1180 DEG C, and controlling the final rolling temperature to be 10-20 DEG C above the set temperature; cooling with laminar flow; cooling the front section with water to 780-820 DEG C; maintaining the air-cooled section at 780-820 DEG C; cooling the rear section at a cooling speed of 100-140 DEG C per second; and coiling. On the premises that components of the existing low-carbon pickling steel are not changed and the tensile strength is not reduced, the yield strength of the low-carbon pickling steel is reduced through adjusting the laminar cooling mode, the laminar cooling speed, the final rolling temperature and the coiling temperature, the yield ratio is reduced, and a thin low-carbon pickling steel plate meeting use requirements of customers with high requirements for the molding performance is provided.
Description
Technical field
The present invention relates to pickling steel and production method thereof, belong in one the method utilizing the thin pickling steel of the low-carbon (LC) of CSP explained hereafter yield tensile ratio≤0.8 particularly.
Background technology
CSP is low with its running cost, and product grains is tiny, and intensity is high, and plate shape and dimensional precision advantages of higher worldwide obtain extensive employing.But because CSP produces the technology and device feature of line, there is soft steel (C≤0.07%) yield tensile ratio (yield strength/tensile strength) high, as above steel plate thickness is produced below 4mm's, then not only template is difficult to control, and cannot meet user's requirement, and yield tensile ratio fluctuation is large, average 0.82, have a strong impact on the cold forming capability of product, especially require higher field, a great problem especially in automobile structure iron equal strength and processability coupling.And although traditional production technique can produce the low-carbon (LC) pickled plate that yield tensile ratio meets the demands, cannot rolling thickness at 1.6mm and following steel sheet, once produce, then can cause plate shape be difficult to control, cause scrap rate to increase, user's requirement can not be met.
For the impact of the yield tensile ratio of steel plate, when getting rid of compositional factors, then the principal element affecting soft steel yield tensile ratio is ferrite grain size and perlite degree.Wherein ferrite grain size all has impact to yield strength and tensile strength, but more obvious on yield strength impact, and perlite area percent major effect is tensile strength.It can thus be appreciated that, under ensureing that product performance meet standard and cost do not increase the prerequisite of (composition is not adjusted), suitable alligatoring ferrite grain size, improve the either pearlite occurred of perlite area percent or formation small and dispersed, under being conducive to ensureing that tensile strength does not reduce or reduces less situation, by reducing yield strength, thus reduce product yield tensile ratio.
When beyond same process and place's carbon under all the other composition the same terms, C content number very large on pearlitic percentage ratio impact, C content is higher, and perlite area percent is higher, and tensile strength is relatively higher.And when considering from the angle of cost, when reducing the constituent content of Si, Mn, its solution strengthening effect cannot ensure that again tensile strength meets the demands.
Find through retrieval, the conventional hot rolling such as Baosteel, Xinyu is produced line and is adopted two sections of types of cooling to reduce the yield tensile ratio of low-carbon (LC) weldering bottle steel HP290.Its principle is alligatoring ferrite crystal grain under C content one stable condition, to reduce yield strength.Meanwhile, improve tensile strength mutually by the perlite strengthening Dispersed precipitate, can at the situation decline low yield strength ratio of ferrite crystal grain without obvious alligatoring.Compared with producing line with CSP, it is relatively low that line yield strength is produced in conventional hot rolling, yield tensile ratio controls more stable, but, produce for thin material, CSP produces line and there is plate form control better, and rolling specs is thinner, the advantages such as dimensional homogeneity is better, therefore the production CSP product line of Thin Specs low-carbon (LC) pickling steel has more advantage.
Ripples steel CSP
[3]analyze the yield tensile ratio influence factor of CSP product, and this is proposed: 1) reduce the Si content in steel as far as possible, suitably increase Ca content in steel, soft steel is then considered to fall Si and carries the constituent contents such as Mn, Al, Ca or V and carry out proof strength, reduce yield tensile ratio, this facilitates the increase of cost undoubtedly; 2) ensure enough soaking pit tapping temperatures, at least ensure that tapping temperature is more than 1050 DEG C, reasonable disposition finishing temperature and coiling temperature: finishing temperature is set as 875-885 DEG C, coiling temperature is set as 670 DEG C or 675 DEG C.This method need promote that cost increases
Tang Gang FTSR
[4]sheet billet continuous casting and rolling production line adopts produces low yield strength ratio hot-rolled coil containing B component, its technical scheme is: (C composition range is for 0.05-0.25% to improve the tensile strength of steel to adopt C, Mn, Mn scope is 0.5-1.5%), the B of≤0.02% content is adopted to reduce the yield strength of steel, higher tensile strength and lower yield strength is realized in the hot rolling, to obtain low yield strength ratio band steel by controlling the combination at different temperatures of each element.This method increase cost of alloy, line is produced for Wuhan Iron and Steel Plant CSP simultaneously, because the impact of continuous casting funnel-type crystallizer can not production C content 0.06-0.17% range band steel, the low-carbon (LC) pickling steel C upper limit is 0.12% simultaneously, therefore, this method produces the higher low-carbon (LC) pickling steel of line producing shaped performance requriements for CSP, and reference is little.
Summary of the invention
The object of the invention is to overcome the deficiency that prior art exists, provide a kind of CSP of utilization technique can ensure tensile strength, do not add alloying element prerequisite under, produce thickness at 1.6mm and following, the method for the thin pickling steel of low-carbon (LC) of yield tensile ratio≤0.8.
Realize the measure of above-mentioned purpose:
By the method for the thin pickling steel of the low-carbon (LC) of CSP explained hereafter yield tensile ratio≤0.8, its step:
1) carry out smelting continuous casting and become base, the final component of molten steel and weight percent content are: C:0.03 ~ 0.07%, Mn:0.35 ~ 0.5%, Si:0.1 ~ 0.2%, and all the other are the impurity elements such as Fe, P, S;
2) be rolled at strand temperature is 1150 ~ 1180 DEG C, and control finishing temperature improve 10 ~ 20 DEG C on design temperature basis;
3) section cooling is carried out: leading portion adopts water-cooled, and is cooled to 780 ~ 820 DEG C; 780 ~ 820 DEG C are maintained in air cooling section; Under speed of cooling 100 ~ 140 DEG C/S, coiling temperature is cooled at back segment;
4) batch, control coiling temperature at 600 ~ 630 DEG C.
The present invention compared with prior art, its feature is exactly at the composition not changing existing low-carbon (LC) pickling steel, ensureing under the prerequisite that tensile strength does not reduce, by the cold mode of adjustment layer and layer speed of cooling, and adjustment finishing temperature, coiling temperature, reduce the yield strength of low-carbon (LC) pickling steel, thus reduce yield tensile ratio, meet to provide the Thin Specs low-carbon (LC) pickled plate that processability requires the service requirements of higher client.
Embodiment
Below the present invention is described in detail:
Embodiment 1
Steel grades is: C:0.03%, Mn:0.45%, Si:0.13%, and all the other are the impurity such as Fe, P, S, and steel plate thickness is 1.5mm, and the temperature of finish to gauge setting is 870 DEG C.
Its step
1) molten steel of final component and weight percent content is smelted and continuous casting becomes base;
2) be rolled at strand temperature is 1155 ~ 1165 DEG C, finishing temperature improves 10 DEG C on the finishing temperature basis of setting, and finishing temperature is 880 DEG C, and being rolled down to steel plate thickness is 1.5mm;
3) carry out section cooling: leading portion adopts weak water-cooled, and be cooled to 780 ~ 790 DEG C; 780 ~ 790 DEG C are maintained in air cooling section; Be cooled to coiling temperature cooling under most back segment speed of cooling 105 DEG C/S;
4) batch, control coiling temperature at 610 ~ 620 DEG C.
After testing, the yield strength of the thin pickling steel of low-carbon (LC) is 309MPa, and tensile strength is 406MPa, yield tensile ratio is 0.75.
Embodiment 2
Steel grades is: C:0.042%, Mn:0.3%, Si:0.17%, and all the other are the impurity such as Fe, P, S, and steel plate thickness is 1.4mm, and the temperature of finish to gauge setting is 860 DEG C.
Its step
1) smelt final component and weight percent content is: molten steel and continuous casting becomes base;
2) be rolled at strand temperature is 1160 ~ 1170 DEG C, finishing temperature improves 20 DEG C on the finishing temperature basis of setting, and finishing temperature is 880 DEG C, and being rolled down to steel plate thickness is 1.4mm;
3) section cooling is carried out: leading portion adopts water-cooled, and is cooled to 790 ~ 800 DEG C; 790 ~ 800 DEG C are maintained in air cooling section; Be cooled to coiling temperature cooling under most back segment speed of cooling 120 DEG C/S;
4) batch, control coiling temperature at 615 ~ 620 DEG C.
After testing, the yield strength of the thin pickling steel of low-carbon (LC) is 300MPa, and tensile strength is 402MPa, yield tensile ratio is 0.74.
Embodiment 3
Steel grades is: C:0.053%, Mn:0.41%, Si:0.2%, and all the other are the impurity such as Fe, P, S, and steel plate thickness is 1.2mm, and the temperature of finish to gauge setting is 850 DEG C.
Its step
1) smelt final component and weight percent content is: molten steel and continuous casting becomes base;
2) be rolled at strand temperature is 1170 ~ 1180 DEG C, finishing temperature improves 20 DEG C on the finishing temperature basis of setting, and finishing temperature is 870 DEG C, and being rolled down to steel plate thickness is 1.2mm;
3) section cooling is carried out: leading portion adopts water-cooled, and is cooled to 810 ~ 820 DEG C; 810 ~ 820 DEG C are maintained in air cooling section; Be cooled to coiling temperature cooling under most back segment speed of cooling 140 DEG C/S;
4) batch, control coiling temperature at 620 ~ 630 DEG C.
After testing, the yield strength of the thin pickling steel of low-carbon (LC) is 325MPa, and tensile strength is 429MPa, yield tensile ratio is 0.76.
Embodiment 4
Steel grades is: C:0.07%, Mn:0.45%, Si:0.1%, and all the other are the impurity such as Fe, P, S, and steel plate thickness is 1.35mm, and the temperature of finish to gauge setting is 860 DEG C.
Its step
1) smelt final component and weight percent content is: molten steel and continuous casting becomes base;
2) be rolled at strand temperature is 1170 ~ 1175 DEG C, finishing temperature improves 12 DEG C on the finishing temperature basis of setting, and finishing temperature is 872 DEG C, and being rolled down to steel plate thickness is 1.35mm;
3) section cooling is carried out: leading portion adopts water-cooled, and is cooled to 800 ~ 810 DEG C; 800 ~ 810 DEG C are maintained in air cooling section; Be cooled to coiling temperature cooling under most back segment speed of cooling 125 DEG C/S;
4) batch, control coiling temperature at 615 ~ 625 DEG C.
After testing, the yield strength of the thin pickling steel of low-carbon (LC) is 315MPa, and tensile strength is 409MPa, yield tensile ratio is 0.77.
Embodiment 5
Steel grades is: C:0.063%, Mn:0.5%, Si:0.16%, and all the other are the impurity such as Fe, P, S, and steel plate thickness is 1.6 mm, and the temperature of finish to gauge setting is 870 DEG C.
Its step
1) smelt final component and weight percent content is: molten steel and continuous casting becomes base;
2) be rolled at strand temperature is 1150 ~ 1160 DEG C, finishing temperature improves 15 DEG C on the finishing temperature basis of setting, and finishing temperature is 885 DEG C, and being rolled down to steel plate thickness is 1.6mm;
3) section cooling is carried out: leading portion adopts water-cooled, and is cooled to 785 ~ 795 DEG C; 785 ~ 795 DEG C are maintained in air cooling section; Be cooled to coiling temperature cooling under most back segment speed of cooling 100 DEG C/S;
4) batch, control coiling temperature at 610 ~ 615 DEG C.
After testing, the yield strength of the thin pickling steel of low-carbon (LC) is 292MPa, and tensile strength is 404MPa, yield tensile ratio is 0.72.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. by the method for the thin pickling steel of low-carbon (LC) of CSP explained hereafter yield tensile ratio≤0.8, its step:
1) carry out smelting continuous casting and become base, the final component of molten steel and weight percent content are: C:0.03 ~ 0.07%, Mn:0.35 ~ 0.5%, Si:0.1 ~ 0.2%, and all the other are Fe, P, S impurity element;
2) be rolled at strand temperature is 1150 ~ 1180 DEG C, and control finishing temperature improve 10 ~ 20 DEG C on design temperature basis;
3) section cooling is carried out: leading portion adopts water-cooled, and is cooled to 780 ~ 820 DEG C; 780 ~ 820 DEG C are maintained in air cooling section; Under speed of cooling 105 ~ 140 DEG C/S, coiling temperature is cooled at back segment;
4) batch, control coiling temperature at 615 ~ 630 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210444732.0A CN102943200B (en) | 2012-11-09 | 2012-11-09 | Method for producing low-carbon thin pickling steel with yield ratio less than or equal to 0.8 through CSP (cast steel plate) process |
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| CN201210444732.0A CN102943200B (en) | 2012-11-09 | 2012-11-09 | Method for producing low-carbon thin pickling steel with yield ratio less than or equal to 0.8 through CSP (cast steel plate) process |
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| CN102943200A CN102943200A (en) | 2013-02-27 |
| CN102943200B true CN102943200B (en) | 2015-01-07 |
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| CN109355484B (en) * | 2018-09-30 | 2020-08-04 | 唐山不锈钢有限责任公司 | Production process of thin 700 MPa-grade ultrahigh-strength hot-rolled black-skin steel strip |
| CN113546973B (en) * | 2021-07-07 | 2022-05-31 | 武汉钢铁有限公司 | Production method for reducing yield ratio of 600 MPa-level low-alloy high-strength steel in CSP process |
| CN113996651A (en) * | 2021-10-29 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Low-carbon steel and manufacturing method for improving performance uniformity of low-carbon steel rolled by ferrite in CSP process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563467A (en) * | 2004-03-17 | 2005-01-12 | 广州珠江钢铁有限责任公司 | Manufacturing technique of hot rolled high tensile steel plate in use for cars based on compact type process flow of producing band steel |
| CN102699029A (en) * | 2012-05-29 | 2012-10-03 | 武汉钢铁(集团)公司 | Manufacturing method for easily pickled steel with low yield ratio by thin slab casting and rolling |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1563467A (en) * | 2004-03-17 | 2005-01-12 | 广州珠江钢铁有限责任公司 | Manufacturing technique of hot rolled high tensile steel plate in use for cars based on compact type process flow of producing band steel |
| CN102699029A (en) * | 2012-05-29 | 2012-10-03 | 武汉钢铁(集团)公司 | Manufacturing method for easily pickled steel with low yield ratio by thin slab casting and rolling |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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