CN102699029B - 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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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 hot-strip production technical field, specifically refer to the manufacture method of the easy pickling steel of a kind of CSP low yield strength ratio.
Background technology
Adopt thin plate blank continuously casting and continuously rolling technology production pickling steel, can realize the mass production that thickness specification is less than 1.6mm product, be conducive to realize " with hot Dai Leng ", this is the irreplaceable advantage of conventional hot rolling technology.But due to the feature of continuous casting and rolling technique of sheet bar and microstructure evolution, such as hot rolling is depressed greatly, fast a large amount of disperse educts etc. of cooling and nitride, oxide and sulfide of laminar flow, compared with conventional hot rolling acid-cleaning steel, the crystal grain of CSP product is thinner, 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, easily cause cold bend cracking and strengthen springback capacity etc., thereby limited the exploitation of pickling steel and applied.
Application number is that 201010151005.6 Chinese invention patent discloses micro-carbon aluminum killed steel that a kind of deep drawing quality of low yield strength ratio is good and preparation method thereof, by adding 0.001 ~ 0.008% B on the basis at micro-carbon aluminum killed steel composition, and control hot rolling reeling temperature and return of goods temperature and obtain having the good micro-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 manufacture method thereof, this steel plate is by add or partly add the alloying elements such as Cr, B, Ti, Nb simultaneously, and coordinate ferrite area rolling, to obtain the production method of the mild steel that low yield strength ratio and punching performance are good.The disclosed method of above-mentioned patent can reach the object of the yield tensile ratio that reduces steel to a certain extent, but is all to have two problems, and the one, add alloying element, increase production cost; The 2nd, boron element is more active, and field control difficulty is large, and properties of product fluctuation is large, is difficult to carry out stability production.
Application number is the manufacture method that 200610021938.7 Chinese invention patent discloses a kind of low yield strength ultrafine grain belt steel, the method comprises the following steps: by carbon manganese steel blank heating to 1150 ~ 1200 DEG C, carry out controlled rolling, roughing start rolling temperature is 1050 ~ 1150 DEG C, roughing finishing temperature is 1000 ~ 1050 DEG C, finish rolling start rolling temperature is 950 ~ 1000 DEG C, finish rolling finishing temperature is 830 ~ 870 DEG C, band steel after finish to gauge is cooled fast to 710 ~ 735 DEG C with the cooling rate of 20 ~ 40 DEG C/s, then by air cooling 3 ~ 5s, finally band steel is cooled fast to and batches 650 ~ 670 DEG C of target temperatures again.And the Chinese invention patent that application number is 200410055539.3 discloses a kind of CSP mild steel ferrite production method, in its smelting process, heating-up temperature is 1100 ~ 1150 DEG C; Entering roughing temperature is 990 ~ 1110 DEG C, and entering final rolling temperature is 830 ~ 560 DEG C, and coiling temperature is 680 ~ 730 DEG C, produces the mild steel of low yield strength ratio.But, above-mentioned two kinds of methods need not be added precious alloy or microalloy element, improve to some extent than method noted earlier, but weak point is as reaching lower yield tensile ratio (below 0.8), two kinds of preparation methods require the higher target temperature (more than 650 DEG C) that batches, and coiling temperature is too high, can increases to a certain extent iron scale thickness, and significantly promote Fe
2o
3generation, due to may structure (FeO, Fe at three kinds of iron scale
2o
3and Fe
3o
4) in, Fe
2o
3the most difficult pickling, therefore excessive temperature batches rear mass-produced Fe
2o
3can significantly increase the difficulty of the follow-up pickling of pickling steel.
Summary of the invention
Object of the present invention is exactly the deficiency in order to overcome above-mentioned prior art and patent, is not additionally adding on the basis of precious alloy element, and a kind of manufacture method of the easy pickling steel of low yield strength ratio of continuous casting and rolling technique of sheet bar flow process is provided.
For achieving the above object, the manufacture method of the easy pickling steel of CSP low yield strength ratio of the present invention, comprise that desulfurizing iron, converter smelting, refining, thin sheet continuous casting, slab soaking, hot continuous rolling, laminar flow are cooling, batch, air-cooled step, its special character is:
Described slab soaking temperature is 1160 ~ 1200 DEG C;
When described hot continuous rolling, directly carry out 7 passage finish rolling, the reduction ratio distribution of each passage is followed successively by: 50 ~ 60%, 50 ~ 60%, 52 ~ 58%, 45 ~ 50%, 20 ~ 25%, 13 ~ 18%, 9 ~ 13%, and finishing temperature is 870 ~ 890 DEG C;
It is 580 ~ 610 DEG C that described laminar flow is cooled to temperature;
Wherein, the percentage by weight of each component of described 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 inevitable impurity.
Preferably, when described laminar flow is cooling, band steel goes out the cold 3 ~ 5s of advanced line space after rack of finishing mill, then is cooled fast to 770 ~ 795 DEG C with the cooling velocity of 10 ~ 20 DEG C/s, then carry out air cooling 5 ~ 7s again, then with the cooling velocity of 15 ~ 25 DEG C/s, band steel is cooled fast to 580 ~ 610 DEG C;
Further, described when air-cooled cooling velocity be 5 ~ 10 DEG C/s, be cooled to 200 DEG C.
In the each step of manufacture method of the easy pickling steel of low yield strength ratio of continuous casting and rolling technique of sheet bar flow process of the present invention, technological parameter setting principle is as follows:
Manufacture method of the present invention is to provide a kind of easy pickling steel of low yield strength ratio of thin specification, to meet the requirement of downstream user to pickling steel, and the realization of promotion " with hot Dai Leng " process.Additionally do not adding under the prerequisite of alloying element, thereby reaching by trimming and fabrication process parameters control the object of yield tensile ratio that reduces steel.The control of slab soaking temperature is 1160 ~ 1200 DEG C, be conducive to obtain crystal grain comparatively thick roll front austenite structure; During to the reduction ratio control of passage, by increasing the reduction ratio of front 4 passages, the cumulative deformation of 3 passages after reducing, and suitably improve finishing temperature, be conducive to the suitable alligatoring of ferrite crystal grain, thereby reach the object that reduces yield tensile ratio; By controlling lower coiling temperature, gained belt steel surface iron scale thickness <10 μ m, and substantially without Fe
2o
3generate, and air-cooled fast by after batching, suppress the carrying out of FeO eutectoid reaction, thereby obtain with a small amount of Fe of a large amount of FeO+
3o
4easy pickling scale structure, contribute to improve the efficiency of follow-up pickling program and reduce acid discharge.Further, carry out the fast cooling control again of first air cooling by laminar flow cooling path, suitably alligatoring ferrite grain size, improves the volume fraction of pearlite phase, is conducive to further reduce the yield tensile ratio of product made from steel.The present invention can provide the steel of the low yield strength ratio pickling below thickness specification 1.6mm, is conducive to the realization of " with hot Dai Leng " process, reduces operation, reduces costs, and this is that routine techniques is beyond one's reach.
Brief description of the drawings
Fig. 1 is the typical optics microstructure picture of the embodiment of the present 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 present invention 1.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the manufacture method of the easy pickling steel of CSP low yield strength ratio of the present invention is described in further detail.
Each percentage pass reduction (shown in table 2), rolling and process for cooling control (shown in table 3) in the composition (shown in table 1) of specific embodiment of the invention steel, manufacture process, wherein, comparative example is conventional ingredient and the technique of current CSP pickling steel.As shown in Figure 1, comparative example's typical metallograph as shown in Figure 2 for the typical metallograph of the embodiment of the present invention 1.In addition, as shown in Figure 3, its iron scale thickness is 8.7 μ m to the typical iron scale pattern photo of the embodiment of the present invention 1, and the ratio of FeO is 25%.
The each composition weight percentage composition of table 1 slab (wt%)
| 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 |
| Comparative example | 0.040 | 0.13 | 0.40 | 0.0050 | 0.010 |
The each percentage pass reduction of table 2 finish rolling distributes controls (%)
| 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 |
| 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
Above-described embodiment product made from steel tissue and mechanical property are tested, are recorded result as shown in table 4:
Table 4
Show by accompanying drawing and table 4 result, the metallographic structure that the inventive method is prepared pickling steel is ferrite+pearlite, wherein ferrite crystal grain is for waiting axle shape, crystallite dimension is 8 ~ 10 μ m, 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 (2)
1. a manufacture method for the easy pickling steel of CSP low yield strength ratio, comprises that desulfurizing iron, converter smelting, refining, thin sheet continuous casting, slab soaking, hot continuous rolling, laminar flow are cooling, batches, air-cooled step, it is characterized in that:
Described slab soaking temperature is 1160～1200 DEG C;
When described hot continuous rolling, directly carry out 7 passage finish rolling, the reduction ratio distribution of each passage is followed successively by: 50～60%, 50～60%, 52～58%, 45～50%, 20～25%, 13～18%, 9～13%, and finishing temperature is 870～890 DEG C;
It is 580～610 DEG C that described laminar flow is cooled to temperature;
Described when air-cooled cooling velocity be 5～10 DEG C/s, be cooled to 200 DEG C;
Wherein, the percentage by weight of each component of described 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 inevitable impurity.
2. the manufacture method of the easy pickling steel of CSP low yield strength ratio according to claim 1, it is characterized in that: when described laminar flow is cooling, band steel goes out the cold 3～5s of advanced line space after finishing mill, be cooled to 770～795 DEG C with the speed of 10～20 DEG C/s again, then carry out air cooling 5～7s again, then with the speed of 15～25 DEG C/s, band steel is cooled to 580～610 DEG C.
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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 true CN102699029B (en) | 2014-08-27 |
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| 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 |
| 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 |
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| CN109338217B (en) * | 2018-11-05 | 2021-03-19 | 首钢集团有限公司 | Girder steel rolling method and girder steel |
| CN110899331B (en) * | 2019-12-05 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Control method of iron oxide powder on surface of hot rolled plate |
| CN110961466B (en) * | 2019-12-19 | 2021-05-28 | 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 |
| 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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