CN102699029A - Manufacturing method for easily pickled steel with low yield ratio by thin slab casting and rolling - Google Patents
Manufacturing method for easily pickled steel with low yield ratio by thin slab casting and rolling Download PDFInfo
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- CN102699029A CN102699029A CN2012101696463A CN201210169646A CN102699029A CN 102699029 A CN102699029 A CN 102699029A CN 2012101696463 A CN2012101696463 A CN 2012101696463A CN 201210169646 A CN201210169646 A CN 201210169646A CN 102699029 A CN102699029 A CN 102699029A
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Abstract
The invention discloses a manufacturing method for easily pickled steel with a low yield ratio by thin slab casting and rolling. The method comprises the steps of molten iron desulfurizing, converter smelting, refining, thin slab continuous casting, slab soaking, hot continuous rolling, laminar cooling, coiling and air-cooling, wherein the slab soaking temperature is 1160 DEG C to 1200 DEG C; finish rolling is directly carried out for seven times in the hot continuous rolling process, and screw-down rate for the seven times is as follows in sequence: 50-60%, 50-60%, 52-58%, 45-50%, 20-25%, 13-18% and 9-13%; the final rolling temperature is 870 DEG C to 890 DEG C; the temperature after laminar cooling is 580 DEG C to 610 DEG C; and the components of the slag are as follows in percentages by weight: 0.045-0.065% of C, not more than 0.05% of Si, 0.40-0.60% of Mn, not more than 0.015% of P, not more than 0.010% of S, and the balance of iron and inevitable impurities. According to the manufacturing method disclosed by the invention, the yield ratio of the easily pickled steel is effectively reduced without the addition of extra noble alloy elements.
Description
Technical field
The invention belongs to the hot-strip production technical field, be meant that specifically a kind of CSP low yield strength ratio is prone to the manufacturing approach of pickling steel.
Background technology
Adopt thin plate blank continuously casting and continuously rolling technology production pickling steel, can realize the mass production of thickness specification less than the 1.6mm product, help realizing " with hot Dai Leng ", this is the irreplaceable advantage of conventional hot rolling technology.But because the characteristics of continuous casting and rolling technique of sheet bar and microstructure evolution; For example hot rolling is depressed greatly, laminar flow fast a large amount of disperses of cooling and nitride, oxide and sulfide separate out etc.; Compare with conventional hot rolling acid-cleaning steel; The crystal grain of CSP product is thinner, and thinner crystal grain can improve the intensity of product on the one hand, but has also brought the higher problem of yield tensile ratio simultaneously.And higher yield tensile ratio can cause harmful effect to the forming property of pickling steel, cause clod wash cracking easily and strengthen springback capacity etc., thereby the exploitation that has limited the pickling steel with apply.
Application number is that 201010151005.6 Chinese invention patent discloses good little carbon aluminum killed steel of a kind of deep drawing quality of low yield strength ratio and preparation method thereof; Through on the basis of little carbon aluminum killed steel composition, adding 0.001 ~ 0.008% B, and control hot rolling reeling temperature and return of goods temperature obtain having the good little carbon aluminum killed steel of deep drawing quality of low yield strength ratio.The patent No. is that 200510012895.1 Chinese invention patent discloses a kind of impact stage low carbon steel hot-rolled sheet and manufacturing approach thereof; This steel plate is through add or partly add alloying elements such as Cr, B, Ti, Nb simultaneously; And cooperate ferrite area rolling, to obtain the production method of the good mild steel of low yield strength ratio and punching performance.The disclosed method of above-mentioned patent can both reach the purpose of the yield tensile ratio that reduces steel to a certain extent, but all is to have two problems, and the one, added alloying element, increased production cost; The 2nd, boron element is more active, and the field control difficulty is big, and the properties of product fluctuation is big, is difficult to carry out stability and produces.
Application number is the manufacturing approach that 200610021938.7 Chinese invention patent discloses a kind of low yield strength ultrafine grain belt steel; This method may further comprise the steps: with carbon manganese steel blank heating to 1150 ~ 1200 ℃, carry out controlled rolling, the roughing start rolling temperature is 1050 ~ 1150 ℃; The roughing finishing temperature is 1000 ~ 1050 ℃; The finish rolling start rolling temperature is 950 ~ 1000 ℃, and the finish rolling finishing temperature is 830 ~ 870 ℃, and the band steel after the finish to gauge is cooled fast to 710 ~ 735 ℃ with the cooling rate of 20 ~ 40 ℃/s; Through air cooling 3 ~ 5s, will be with steel to be cooled fast at last again and batch 650 ~ 670 ℃ of target temperatures then.And application number is that 200410055539.3 Chinese invention patent discloses a kind of CSP mild steel ferrite production method, and heating-up temperature is 1100 ~ 1150 ℃ in its smelting process; Advancing the roughing temperature is 990 ~ 1110 ℃, and advancing final rolling temperature is 830 ~ 560 ℃, and coiling temperature is 680 ~ 730 ℃, produces the mild steel of low yield strength ratio.But; Above-mentioned two kinds of methods need not be added valuable alloy or microalloy element, improve to some extent than method noted earlier, but weak point are to reaching lower yield tensile ratio (below 0.8); Two kinds of preparation methods require the higher target temperature (more than 650 ℃) that batches; And coiling temperature is too high, can increase iron scale thickness to a certain extent, and significantly promotes Fe
2O
3Generation because maybe structure (FeO, Fe at three kinds of iron scale
2O
3And Fe
3O
4) in, Fe
2O
3The most difficult pickling, so excessive temperature batches the mass-produced Fe in back
2O
3Can significantly increase the difficulty of the follow-up pickling of pickling steel.
Summary of the invention
The object of the invention is exactly in order to overcome the deficiency of above-mentioned prior art and patent, on the basis of the valuable alloying element of not extra interpolation, a kind of manufacturing approach of the easy pickling steel of low yield strength ratio of continuous casting and rolling technique of sheet bar flow process is provided.
For realizing above-mentioned purpose; CSP low yield strength ratio of the present invention is prone to the manufacturing approach of pickling steel; Comprise that desulfurizing iron, converter smelting, refining, thin sheet continuous casting, slab soaking, hot continuous rolling, laminar flow cool off, batch, air-cooled step, its special character is:
Said slab soaking temperature is 1160 ~ 1200 ℃;
Directly carry out 7 passage finish rolling during said hot continuous rolling, the reduction ratio of each passage distributes and is followed successively by: 50 ~ 60%, 50 ~ 60%, 52 ~ 58%, 45 ~ 50%, 20 ~ 25%, 13 ~ 18%, 9 ~ 13%, and finishing temperature is 870 ~ 890 ℃;
It is 580 ~ 610 ℃ that said laminar flow is cooled to temperature;
Wherein, the percentage by weight of each component of said slab is C:0.045 ~ 0.065%, Si≤0.05%, and Mn:0.40 ~ 0.60%, P≤0.015%, S≤0.010%, all the other are iron and unavoidable impurities.
Preferably; During the cooling of said laminar flow, the band steel goes out the cold 3 ~ 5s of advanced line space after the frame of finishing mill end, and the cooling velocity with 10 ~ 20 ℃/s is cooled fast to 770 ~ 795 ℃ again; Carry out air cooling 5 ~ 7s once more then, will be with steel to be cooled fast to 580 ~ 610 ℃ with the cooling velocity of 15 ~ 25 ℃/s again;
Further, said when air-cooled cooling velocity be 5 ~ 10 ℃/s, be cooled to 200 ℃.
The low yield strength ratio of continuous casting and rolling technique of sheet bar flow process of the present invention is prone in each step of manufacturing approach of pickling steel technological parameter, and that principle is set is following:
The low yield strength ratio that manufacturing approach of the present invention provides a kind of thin specification is prone to the pickling steel, satisfying the requirement of downstream user to the pickling steel, and promotes " with hot Dai Leng " realization process.Under the prerequisite of not extra interpolation alloying element, thereby control the purpose that reaches the yield tensile ratio that reduces steel through trimming and fabrication process parameters.The slab soaking temperature is controlled to be 1160 ~ 1200 ℃, help obtaining crystal grain comparatively thick roll preceding austenite structure; When the reduction ratio of passage is controlled,, reduce the cumulative deformation of back 3 passages, and suitably improve finishing temperature, help the suitable alligatoring of ferrite crystal grain, thereby reach the purpose that reduces yield tensile ratio through increasing the reduction ratio of preceding 4 passages; Through the lower coiling temperature of control, gained belt steel surface iron scale thickness<10 μ m, and do not have Fe basically
2O
3Generate, and air-cooled fast through after batching, suppress the carrying out of FeO eutectoid reaction, thereby obtain with lot of F eO+ small amount of Fe
3O
4Easy pickling scale structure, help to improve the efficient of follow-up pickling program and reduce the acid discharging.Further, carry out first air cooling quick Cooling Control again through the laminar flow cooling path, suitable alligatoring ferrite grain size improves the volume fraction of pearlite phase, helps further reducing the yield tensile ratio of product made from steel.The present invention can provide the low yield strength ratio pickling steel below the thickness specification 1.6mm, helps " with hot Dai Leng " realization process, reduces operation, reduces cost, and this is that routine techniques is beyond one's reach.
Description of drawings
Fig. 1 is the typical optics microstructure picture of the embodiment of the invention 1 steel.
Fig. 2 is the typical optics microstructure picture of comparative example's steel of the present invention.
Fig. 3 is the typical iron scale pattern photo of the embodiment of the invention 1.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the manufacturing approach that CSP low yield strength ratio of the present invention is prone to the pickling steel is done further explain.
Each percentage pass reduction (shown in the table 2), rolling and process for cooling control (shown in the table 3) in the composition of specific embodiment of the invention steel (shown in the table 1), the manufacture process; Wherein, the comparative example is the conventional ingredient and the technology of present CSP pickling steel.The typical metallograph of the embodiment of the invention 1 is as shown in Figure 1, and comparative example's typical metallograph is as shown in Figure 2.In addition, the typical iron scale pattern photo of the embodiment of the invention 1 is as shown in Figure 3, and its iron scale thickness is 8.7 μ m, and the ratio of FeO is 25%.
Each composition weight percentage composition (wt%) of table 1 slab
| Embodiment | C | Si | Mn | S | P |
| Embodiment 1 | 0.045 | 0.05 | 0.60 | 0.008 | 0.009 |
| Embodiment 2 | 0.055 | 0.03 | 0.50 | 0.004 | 0.007 |
| Embodiment 3 | 0.063 | 0.05 | 0.40 | 0.006 | 0.004 |
| Embodiment 4 | 0.050 | 0.03 | 0.55 | 0.005 | 0.012 |
| Embodiment 5 | 0.065 | 0.04 | 0.45 | 0.010 | 0.015 |
| The comparative example | 0.040 | 0.13 | 0.40 | 0.0050 | 0.010 |
Each percentage pass reduction of table 2 finish rolling distributes control (%)
| Embodiment | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Embodiment 1 | 50.0 | 58.7 | 54.5 | 47.3 | 22.7 | 16.2 | 9.5 |
| Embodiment 2 | 52.2 | 58.6 | 55.0 | 45.2 | 21.8 | 15.1 | 10.2 |
| Embodiment 3 | 54.5 | 57.2 | 56.2 | 46.1 | 23.5 | 14.6 | 11.3 |
| Embodiment 4 | 60.0 | 50.5 | 57.5 | 45.2 | 20.1 | 13.2 | 9.0 |
| Embodiment 5 | 55.2 | 60.0 | 52.2 | 49.8 | 25.0 | 17.8 | 13.0 |
| The comparative example | 52.2 | 58.6 | 45.1 | 38.1 | 29.2 | 26.1 | 14.8 |
Table 3 rolling mill practice and process for cooling control
The foregoing description product made from steel tissue and mechanical property are tested, and it is as shown in table 4 to record the result:
Table 4
Show through accompanying drawing and table 4 result; The metallographic structure that the inventive method prepares the pickling steel is ferrite+pearlite, and wherein ferrite crystal grain is for waiting axle shape, and crystallite dimension is 8 ~ 10 μ m; The pearlite ratio is 7 ~ 13%; Yield strength is 295 ~ 330MPa, and tensile strength is 400 ~ 440 MPa, and yield tensile ratio is less than 0.77.
Claims (3)
1. a CSP low yield strength ratio is prone to the manufacturing approach of pickling steel, comprises that desulfurizing iron, converter smelting, refining, thin sheet continuous casting, slab soaking, hot continuous rolling, laminar flow cool off, batch, air-cooled step, it is characterized in that:
Said slab soaking temperature is 1160 ~ 1200 ℃;
Directly carry out 7 passage finish rolling during said hot continuous rolling, the reduction ratio of each passage distributes and is followed successively by: 50 ~ 60%, 50 ~ 60%, 52 ~ 58%, 45 ~ 50%, 20 ~ 25%, 13 ~ 18%, 9 ~ 13%, and finishing temperature is 870 ~ 890 ℃;
It is 580 ~ 610 ℃ that said laminar flow is cooled to temperature;
Wherein, the percentage by weight of each component of said slab is C:0.045 ~ 0.065%, Si≤0.05%, and Mn:0.40 ~ 0.60%, P≤0.015%, S≤0.010%, all the other are iron and unavoidable impurities.
2. CSP low yield strength ratio according to claim 1 is prone to the manufacturing approach of pickling steel; It is characterized in that: when said laminar flow cools off; The band steel goes out the cold 3 ~ 5s of advanced line space behind the finishing mill; Speed with 10 ~ 20 ℃/s is cooled to 770 ~ 795 ℃ again, carries out air cooling 5 ~ 7s once more then, will be with steel to be cooled to 580 ~ 610 ℃ with the speed of 15 ~ 25 ℃/s again.
3. CSP low yield strength ratio according to claim 1 and 2 is prone to the manufacturing approach of pickling steel, it is characterized in that: said when air-cooled cooling velocity be 5 ~ 10 ℃/s, be cooled to 200 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210169646.3A CN102699029B (en) | 2012-05-29 | 2012-05-29 | Manufacturing method for easily pickled steel with low yield ratio by thin slab casting and rolling |
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| CN201210169646.3A CN102699029B (en) | 2012-05-29 | 2012-05-29 | Manufacturing method for easily pickled steel with low yield ratio by thin slab casting and rolling |
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| CN102699029B CN102699029B (en) | 2014-08-27 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943200A (en) * | 2012-11-09 | 2013-02-27 | 武汉钢铁(集团)公司 | Method for producing low-carbon thin pickling steel with yield ratio less than or equal to 0.8 through CSP (cast steel plate) process |
| CN106222561A (en) * | 2016-08-30 | 2016-12-14 | 日照宝华新材料有限公司 | The method producing low-carbon (LC) fire-fighting equipment steel based on ESP bar strip continuous casting and rolling flow path |
| CN107236853A (en) * | 2017-06-26 | 2017-10-10 | 武汉钢铁有限公司 | Short route rolls zinc-aluminum-magnesium coating hot forming steel and its manufacture method |
| CN109338217A (en) * | 2018-11-05 | 2019-02-15 | 首钢集团有限公司 | A kind of beam steel milling method and beam steel |
| CN110899331A (en) * | 2019-12-05 | 2020-03-24 | 马鞍山钢铁股份有限公司 | Control method of iron oxide powder on surface of hot rolled plate |
| CN110961466A (en) * | 2019-12-19 | 2020-04-07 | 北京首钢股份有限公司 | Production method of interstitial-free steel |
| CN112588844A (en) * | 2020-10-28 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | Method for controlling iron scale of high-temperature hot coil of automobile O5 plate at large cooling rate |
| CN114350911A (en) * | 2021-12-29 | 2022-04-15 | 日照钢铁控股集团有限公司 | Preparation method of hot-rolled 700 MPa-grade complex-phase high-strength weather-resistant steel |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943200A (en) * | 2012-11-09 | 2013-02-27 | 武汉钢铁(集团)公司 | Method for producing low-carbon thin pickling steel with yield ratio less than or equal to 0.8 through CSP (cast steel plate) process |
| CN102943200B (en) * | 2012-11-09 | 2015-01-07 | 武汉钢铁(集团)公司 | Method for producing low-carbon thin pickling steel with yield ratio less than or equal to 0.8 through CSP (cast steel plate) process |
| CN106222561A (en) * | 2016-08-30 | 2016-12-14 | 日照宝华新材料有限公司 | The method producing low-carbon (LC) fire-fighting equipment steel based on ESP bar strip continuous casting and rolling flow path |
| CN106222561B (en) * | 2016-08-30 | 2018-03-27 | 日照钢铁控股集团有限公司 | Method based on ESP bar strip continuous casting and rolling flow paths production low-carbon fire-fighting equipment steel |
| CN107236853A (en) * | 2017-06-26 | 2017-10-10 | 武汉钢铁有限公司 | Short route rolls zinc-aluminum-magnesium coating hot forming steel and its manufacture method |
| CN109338217A (en) * | 2018-11-05 | 2019-02-15 | 首钢集团有限公司 | A kind of beam steel milling method and beam steel |
| CN109338217B (en) * | 2018-11-05 | 2021-03-19 | 首钢集团有限公司 | Girder steel rolling method and girder steel |
| CN110899331A (en) * | 2019-12-05 | 2020-03-24 | 马鞍山钢铁股份有限公司 | Control method of iron oxide powder on surface of hot rolled plate |
| CN110961466A (en) * | 2019-12-19 | 2020-04-07 | 北京首钢股份有限公司 | Production method of interstitial-free steel |
| CN112588844A (en) * | 2020-10-28 | 2021-04-02 | 邯郸钢铁集团有限责任公司 | Method for controlling iron scale of high-temperature hot coil of automobile O5 plate at large cooling rate |
| CN114350911A (en) * | 2021-12-29 | 2022-04-15 | 日照钢铁控股集团有限公司 | Preparation method of hot-rolled 700 MPa-grade complex-phase high-strength weather-resistant steel |
| CN114350911B (en) * | 2021-12-29 | 2024-03-29 | 日照钢铁控股集团有限公司 | Preparation method of hot-rolled 700 MPa-grade complex-phase high-strength weather-resistant steel |
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Effective date of registration: 20170717 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Hubei, Wuhan, Wuchang Friendship Road, No. 999, block A, floor 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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