CN101818299A - High-strength thin-specification direct-plating steel based on thin slab casting and rolling process and making method thereof - Google Patents
High-strength thin-specification direct-plating steel based on thin slab casting and rolling process and making method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000005096 rolling process Methods 0.000 title claims abstract description 30
- 238000007747 plating Methods 0.000 title claims abstract description 27
- 238000005266 casting Methods 0.000 title abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000009749 continuous casting Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims abstract description 8
- -1 0.09-0.25% Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052786 argon Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 238000005097 cold rolling Methods 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 2
- 238000013459 approach Methods 0.000 claims 5
- 238000007664 blowing Methods 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 238000005098 hot rolling Methods 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 8
- 238000000137 annealing Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention provides high-strength thin-specification direct-plating steel based on a thin slab casting and rolling process and a making method thereof. The steel comprises the following chemical components in percentage by weight: C, 0.17-0.20%, Si, 0.09-0.25%, Mn, 0.90-1.40%, P, not more than 0.020%, S, not more than 0.010%, Als, 0.015-0.060%, and the balance of Fe and inevitable impurities. The process comprises the steps of molten iron desulfuration, bessemerize, argon blowing, LE furnace refining, continuous casting, descaling in a rotating way, soaking pit treatment, hydraulic jet descaling, seven-rack finish rolling, laminar cooling and reeling, wherein liquid core downward pressing is adopted in the step of continuous casting and the casting blank thickness is decreased to 50-55mm from 70-90mm; the discharging temperature of a soaking pit is 180-1200 DEG C to ensure that the temperature of blanks during the hydraulic jet descaling is between 1175-1190 DEG C and the temperature of a hydraulic jet descaling collecting pipe is 32-38 MPa; and the average cooling speed of laminar cooling after the seven-rack finish rolling is 30-60 DEG C/s.
Description
Technical field
The present invention relates to thin specification direct-plating steel of a kind of high strength and manufacture method thereof based on continuous casting and rolling technique of sheet bar.Belong to hot rolling direct-plating steel technical field.
Background technology
The hot rolling direct-plating steel just is meant after overpickling can directly galvanized a kind of hot-rolled sheet, compares with traditional cold-rolling galvanization substrate, owing to lacked cold rolling and the annealing two procedures, the hot rolling direct-plating steel has tangible cost advantage.As far back as the eighties in 20th century, developed country such as the U.S. and Japan has just begun scale operation hot rolling direct-plating steel, for example Ri Ben Kawasaki Steel Chiba factory has just developed the hot rolling direct-plating steel of straight carbon steel and 400MPa level at the end of the eighties, in addition, the Pu Xiang Guangyang factory of Korea S has also started to develop the hot rolling direct-plating steel of super quality and competitive price at the beginning of calendar year 2001.In the last few years, along with the development of hot rolling technology, the hot-rolled product quality improved constantly, and thickness is attenuate gradually, and the hot rolling direct-plating steel has partly replaced cold-reduced sheet as the substrate of galvanized sheet.
At present, the hot rolling direct-plating steel, (the hot rolling direct-plating steel of thickness≤2.0mm) has had a considerable amount of market requirements in China to particularly thin specification, but this kind still belongs to blank in China, generally substitutes with cold-rolled substrate on the market.In the last few years, along with the maturation gradually of hot rolling development of technology, particularly thin plate blank continuously casting and continuously rolling technology, the thickness of hot rolled strip was more and more thinner, and performance and surface quality are also become better and better.China has had 14 of short flow process sheet billet continuous casting and rolling production lines at present, and has had rolling technology of a large amount of thin materials and experience deposit, has objectively possessed the working condition of the thin size hot-rolled direct-plating steel of large-scale mass production.But in the actual production, thin specification direct-plating steel each link in steel smelting-continuous casting-soaking-rolling-whole process of cooling its special processing requirement is all arranged, so the production difficulty is very big, and stably manufactured is just difficult more in batches.
In recent years, more for the research of the manufacture method of high-strength hot-dip zinc-coated steel sheet.Document [1] publication number for example: CN 101166843A discloses a kind of by adding proper C r, through cold rolling and carry out corresponding thermal treatment, obtains having concurrently the manufacture method of the high-strength hot-dip zinc-coated steel sheet of high ductibility and high stretch flange;
Document [2] publication number: CN 1117884C, proposed a kind ofly to make the banded structure of steel plate be distributed to certain limit by thermal treatment, obtaining the method for intensity and processing characteristics preferably simultaneously, and proposed by 2 sections heating cleanup acid treatment methods, Alloying Treatment method to improve the method for steel plate platability.
Document [3] publication number: CN 1457371A, a kind of interpolation Nb, Cr have been proposed, form median size and be following ferrite of 10 μ m and second mutually the method for complex tissue, can prevent that HAZ is softening and obtain good processing characteristics when welding;
Document [4] publication number: CN 1985016A has proposed a kind ofly to make when steel and contain the method that Si, Mn and Al also can guarantee to have good zinc-plated performance by adding Ni;
Document [5] publication number: CN 1860249A, propose by a kind of special chemical ingredients balanced relationship (comprising Ti, Nb, Mo, B), and adopt suitable hot rolling and annealing conditions to make, obtain taking into account the method for the high-strength hot-dip zinc-coated steel sheet of high-yield-ratio, ductility and weldability;
Document [6] publication number: CN 1333383A has proposed a kind of steel plate to be carried out nitriding treatment, to guarantee the method as the residual austenite tissue of target.
Document [7] publication number: CN 1124358C, propose a kind of interpolation microalloy element with crystal grain thinning, and adopted heating, the method that banded structure thickness is subdued, improve mechanical property, and disclose a kind of method that improves the zinc-plated performance of steel plate with second-heating of batching by high temperature.
There is following problem in above-mentioned prior art: 1) mainly improve mechanical property by adding alloying element, cost is higher; 2) need be by just carrying out pot galvanize after cold rolling and the annealing operation, complex procedures and resource consumption are big; 3) minority mentions after the hot rolling that without cold rolling direct galvanized technology, as document [3], [7], but because it adopts conventional hot rolling technology, the thickness specification of thickness steel plate can't realize with hot Dai Leng generally all greater than 2.0mm.
Summary of the invention
The purpose of this invention is to provide a kind of thin specification direct-plating steel of other CSP high strength and manufacture method thereof of not adding than expensive alloy element, thin (the thickness≤2.0mm) of its product thickness specification, intensity height (tensile strength is 500～600MPa level), and have and directly plate performance preferably, can partly replace cold-rolling galvanization substrate and thick size hot-rolled zinc-plated substrate, realization is with hot Dai Leng, with Bao Daihou, can reduce production costs and reduce resource consumption effectively, also meet the CSP product with hot Dai Leng simultaneously, national industrial policies and industry development trend with Bao Daihou.
Technical scheme of the present invention: the thin specification direct-plating steel of the high strength based on continuous casting and rolling technique of sheet bar of the present invention, the weight percent proportioning of its chemical ingredients is: C:0.17～0.20%, Si:0.09～0.2b%, Mn:0.90～1.40%, P :≤0.020%, S :≤0.010, Als:0.015～0.060%, all the other are iron and unavoidable impurities.The optimum weight per distribution ratio of Si is: 0.11～0.15%.
The production process route of the thin specification direct-plating steel of CSP high strength of the present invention is as follows: desulfurizing iron → bessemerize → Argon → LF stove refining → continuous casting → rotation de-scaling → soaking pit → high-pressure water descaling → 7 frame finish rolling → laminar flows cool off → batch, wherein continuous casting working procedure adopts the liquid core to depress, and slab thickness is pressed from 70～90mm and reduced to 50～55mm.Hot-rolled process parameter carries out following control:
(1) the slab tapping temperature is 1180～1200 ℃, and the temperature of slab is at Fe during with the assurance high-pressure water descaling
2SiO
4Liquidus temperature (1173 ℃) on, help the removing of scale on surface;
(2) pressure of high pressure descaling collector is 32～38MPa;
(3) draft of preceding 3 passages and rolling temperature are respectively: F1:55～65%, 1040～1060 ℃; F2:50～60%, 990～1010 ℃; F3:40～50%, 960～990 ℃;
(4) draft and the rolling temperature of back 4 passages are respectively: F4:30～40%, 930～950 ℃; F5:25～35%, 920～940 ℃; F6:20～35%, 900～930 ℃; F7:10～20%, 860～890 ℃;
(5) finishing temperature is 840～860 ℃, coiling temperature: 610～630 ℃;
(6) for guaranteeing that thin specification band steel has good plate shape, adopt the not refrigerative laminar flow type of cooling of the band steel toe 5m of portion; Crossed after the 5m, laminar cooling water is opened, and its average cooling rate is 30～60 ℃/s.
The wood invention has following advantage: (1) carries out particular design and strict control to Si content, can significantly improve the pot galvanize performance of band steel; (2) increase rotation de-scaling operation, and tapping temperature and de-scaling pressure are adjusted, can improve the surface quality of band steel, particularly can significantly reduce the iron scale of belt steel surface, help pot galvanize with steel; (3) chemical ingredients and each frame rolling technological parameter of finish rolling are designed especially, can guarantee to have higher intensity with steel; (4) load distribution and the laminar flow type of cooling of slab thickness, each frame of finish rolling are adjusted, can be realized with the thin specification of steel rollingly, and have good plate shape; (5) product thickness specification of the present invention is thinner, is 1.0～2.0mm, can partly substitute the cold-rolling galvanization substrate of same specification, owing to lacked cold rolling and the annealing two procedures, so production cost is lower, resource consumption is less.
Embodiment
The present invention is further illustrated below in conjunction with embodiment.
The chemical component weight per distribution ratio of steel is: C:0.17～0.20%, and Si:0.09～0.25%, Mn:0.90～1.40%, P :≤0.020%, S :≤0.010, Als:0.015～0.060%, all the other are iron and unavoidable impurities.Wherein the optimum range of Si content is 0.11～0.15%.
Si in the steel has tangible influence to the pot galvanize of steel plate.When Si content greater than 0.3% the time, the coating thickening also forms gray layer, the adhesion property of coating degenerates simultaneously; When Si content was 0.06～0.07%, the gloomy color spot point of coating was maximum.For guaranteeing that the band steel has good zinc-plated performance, Si content must strict control.The span of control of Si content of the present invention is 0.09～0.25%.
The technological process of production of the thin specification direct-plating steel of CSP high strength of the present invention comprises: desulfurizing iron, bessemerize, Argon, the refining of LF stove, continuous casting, rotation de-scaling, soaking pit, high-pressure water descaling, 7 frame finish rolling, laminar flow cooling and batch.
Adopt the liquid core to depress technology and the thickness of slab is pressed by 70～90mm reduce to 50～55m, remove the laggard soaking pit heating of its surperficial iron scale through the rotation descaling device, the tapping temperature of slab is 1180～1200 ℃, and is the best with 1185～1195 ℃; Slab adopts high pressure water descaling device to remove its surperficial iron scale once more from the soaking pit back of coming out, and de-scaling pressure is 32～38MPa, and is the best with 34～36MPa; Slab after the de-scaling adopts 7 finishing mills to be rolled, and the draft of each frame, the optimum range of rolling temperature are: F1:60～65%, 1050～1060 ℃; F2:55～60%, 1000～1010 ℃; F3:45～50%, 980～990 ℃; F4:30～35%, 930～940 ℃; F5:25～30%, 920～930 ℃; F6:25～30%, 900～910 ℃; F7:10～15%, 860～870 ℃; Finishing temperature is 840～860 ℃, and optimum range is 845～855 ℃; In the laminar flow process of cooling, the 5m of portion is not cold for the band steel toe, and with the average rate of cooling cooling zone of 30～60 ℃/s steel, best rate of cooling scope is 40～50 ℃/s subsequently; Coiling temperature is 610～630 ℃, and optimum range is 610～620 ℃.
Product thickness is 1.0～2.0mm, and tensile strength is 500～600MPa level, can partly replace the cold-rolling galvanization substrate of same size, and direct heat is zinc-plated after pickling.
Be specific embodiment 1～4 below.Embodiment only is used to illustrate the present invention, rather than where formula limits the present invention with thousand.
The chemical Composition Control of embodiment is as shown in table 1.
Chemical Composition Control situation (the unit: wt%) of table 1: embodiment 1～4
| Chemical ingredients | ??C | ??Si | ??Mn | ??S | ??P | ??Als |
| Embodiment 1 | ??0.17 | ??0.090 | ??1.4 | ??0.0011 | ??0.013 | ??0.015 |
| Embodiment 2 | ??0.1857 | ??0.11 | ??1.249 | ??0.0018 | ??0.013 | ??0.030 |
| Embodiment 3 | ??0.1902 | ??0.15 | ??1.261 | ??0.0012 | ??0.015 | ??0.040 |
| Embodiment 4 | ??0.20 | ??0.25 | ??0.9 | ??0.0027 | ??0.016 | ??0.060 |
The process parameter control situation of embodiment is as shown in table 2.
The process parameter control of table 2: embodiment 1～4
The performance of embodiment and surface quality result are as shown in table 3.
The performance test results of table 3: embodiment 1～4
| Embodiment | Yield strength | Tensile strength | Unit elongation | Surface quality | Zinc-plated performance |
| ??(MPa) | ??(MPa) | ??(％) | |||
| ??1 | ??450 | ??585 | ??27 | Very | Very |
| ??2 | ??435 | ??570 | ??28 | Good | Good |
| ??3 | ??440 | ??565 | ??30 | Good | Good |
| ??4 | ??465 | ??590 | ??28 | Very | Very |
Claims (8)
1. the high strength based on continuous casting and rolling technique of sheet bar approaches specification direct-plating steel, the weight percent proportioning of its chemical ingredients is: C:0.17～0.20%, Si:0.09～0.25%, Mn:0.90～1.40%, P :≤0.020%, S :≤0.010, Als:0.015～0.060%, all the other are iron and unavoidable impurities.
2. according to the thin specification direct-plating steel of the described high strength based on continuous casting and rolling technique of sheet bar of claim 1, it is characterized in that: the weight percent proportioning of Si is: 0.11～0.15%.
3. one kind is used for claim 1 or the 2 described manufacture method that approach specification direct-plating steel based on the high strength of continuous casting and rolling technique of sheet bar, technical process comprises: desulfurizing iron, bessemerize, Argon, the refining of LF stove, continuous casting, rotation de-scaling, soaking pit, high-pressure water descaling, 7 frame finish rolling, laminar flow cooling and batch, it is characterized in that: adopt the liquid core to depress during continuous casting, slab thickness is pressed from 70～90mm and is reduced to 50～55mm; The soaking pit tapping temperature is 1180～1200 ℃, and the temperature of slab is in 1175～1190 ℃ of scopes during with the assurance high-pressure water descaling, and the pressure of high pressure descaling collector is 32～38Mpa; The percentage pass reduction and the rolling temperature of 7 each passage of frame finish rolling are respectively: F1:55～65%, 1040～1060 ℃; F2:50～60%, 990～1010 ℃; F3:40～50%, 960～990 ℃; F4:30～40%, 930～950 ℃; F5:25～35%, 920～940 ℃; F6:20～35%, 900～930 ℃; F7:10～20%, 860～900 ℃.
4. according to the described manufacture method that approaches specification direct-plating steel based on the high strength of continuous casting and rolling technique of sheet bar of claim 3, it is characterized in that: the not type of cooling of the band steel toe 5m of portion is adopted in the laminar flow cooling, after the 5m, laminar flow water is opened, and its average rate of cooling is 30～60 ℃/s.
5. according to claim 3 or the 4 described manufacture method that approach specification direct-plating steel based on the high strength of continuous casting and rolling technique of sheet bar, it is characterized in that: product thickness is 1.0～2.0mm, tensile strength is 500～600MPa level, can partly replace the cold-rolling galvanization substrate of same size, direct heat is zinc-plated after pickling.
6. according to the manufacture method of claim 3 or the thin specification direct-plating steel of 4 described high strength based on continuous casting and rolling technique of sheet bar, it is characterized in that: the tapping temperature of slab be 1185～1195 ℃ for best.
7. according to the manufacture method of claim 3 or the thin specification direct-plating steel of 4 described high strength based on continuous casting and rolling technique of sheet bar, it is characterized in that: in the laminar flow process of cooling, best rate of cooling scope is 40～50 ℃/s.
8. according to claim 3 or the 4 described manufacture method that approach specification direct-plating steel based on the high strength of continuous casting and rolling technique of sheet bar, it is characterized in that: seven finishing mills are rolled, the draft of each frame, the optimum range of rolling temperature are: F1:60～65%, 1050～1060 ℃; F2:55～60%, 1000～1010 ℃; F3:45～50%, 980～990 ℃; F4:30～35%, 930～940 ℃; F5:25～30%, 920～930 ℃; F6:25～30%, 900～910 ℃; F7:10～15%, 860～870 ℃; The finishing temperature optimum range is 845～855 ℃.
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| CN102690937A (en) * | 2012-06-20 | 2012-09-26 | 武汉钢铁(集团)公司 | Production method of steel for thin-specification sand-spraying-free and shot-blasting-free structure |
| 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 |
| CN102839321A (en) * | 2012-08-31 | 2012-12-26 | 武汉钢铁(集团)公司 | Ultrathin hot-rolled sheet strip with yield strength more than or equal to 500MPa level and manufacturing method thereof |
| CN103667908A (en) * | 2013-12-03 | 2014-03-26 | 武汉钢铁(集团)公司 | Hot-rolled high-strength sheet steel having tensile strength of 540MPa, and production method thereof |
| CN104831207A (en) * | 2015-04-16 | 2015-08-12 | 河北钢铁股份有限公司邯郸分公司 | Thin gauge 600MPa grade hot galvanized plate production method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102699029B (en) * | 2012-05-29 | 2014-08-27 | 武汉钢铁(集团)公司 | Manufacturing method for easily pickled steel with low yield ratio by thin slab casting and rolling |
| 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 |
| CN102690937A (en) * | 2012-06-20 | 2012-09-26 | 武汉钢铁(集团)公司 | Production method of steel for thin-specification sand-spraying-free and shot-blasting-free structure |
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