CN103741019B - A kind of hot rolled strip and production method thereof - Google Patents
A kind of hot rolled strip and production method thereof Download PDFInfo
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- CN103741019B CN103741019B CN201310705115.6A CN201310705115A CN103741019B CN 103741019 B CN103741019 B CN 103741019B CN 201310705115 A CN201310705115 A CN 201310705115A CN 103741019 B CN103741019 B CN 103741019B
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Abstract
The present invention relates to a kind of hot rolled strip and production method thereof, the hot rolled strip of exploitation silicone content≤0.03, contains the C of 0.15-0.19 according to weight proportion, the Mn of the Si of≤0.03,0.7-0.9, the P of≤0.020, the Als of the S of≤0.015,0.03-0.05, surplus is Fe and inevitable impurity.Due to the Composition Control of ultra-low silicon, this strip has better zinc-plated performance, is applicable to the production of galvanized pipe.The production of this steel plate adopts ultra-low silicon composition and appropriate steel-making and suitable TMCP technique, producing when not affecting the mechanical properties, having the hot rolled strip of good zinc-plated performance.Plate Production is by steel-making, continuous casting, heating, controlled rolling and controlled cooling, batches and produce with related process.
Description
Technical field
The present invention relates to a kind of hot rolled strip and production method thereof, be specifically related to a kind of ultra-low silicon composition tubulation steel hot rolled strip and the production method thereof with good zinc-plated performance, this product is used for the production of silicone content≤0.03 zinc-plated tubulation steel hot-rolled sheet band.
Background technology
For the hot rolled strip that will be used as zinc-plated tube-making process, not only to meet its requirement of strength, more to improve its zinc-plated performance, the requirement of zinc-plated raw material to purity of steel is stricter, adopt the Si constituent content as far as possible reduced in steel band, can improve the zinc-plated property of steel band, the chemical element of ultra-low silicon controls to be a difficult point in producing.The domestic production to ultra-low silicon composition steel band at present often has the phenomenon existence exceeding internal control, standard, in general production, the Si control of element of ultra-low silicon steel band has 5-10% can exceed the requirement of the internal control upper limit, Si elemental composition has certain fluctuation, what present stage was badly in need of solving is reduce the Si content in molten steel by optimized production process and reduces back silicon amount, and in the follow-up operation of rolling, need the appropriate production technique of use to make up low silicon to cause undercapacity impact on steel strength.
Summary of the invention
The object of the present invention is to provide a kind of hot rolled strip and production method thereof, the hot rolled strip of exploitation silicone content≤0.03, due to the Composition Control of ultra-low silicon, this strip has better zinc-plated performance, is applicable to the production of galvanized pipe.The production of this steel plate adopts ultra-low silicon composition and appropriate steel-making and suitable TMCP technique, producing when not affecting the mechanical properties, having the hot rolled strip of good zinc-plated performance.Plate Production is by steel-making, continuous casting, heating, controlled rolling and controlled cooling, batches and produce with related process.
Concrete technical scheme is as follows:
A kind of hot rolled strip, it is the zinc-plated tubulation steel hot rolled strip of silicone content≤0.03.
Further, contain the C of 0.15-0.19 according to weight proportion, the Mn of the Si of≤0.03,0.7-0.9, the P of≤0.020, the Als of the S of≤0.015,0.03-0.05, surplus is Fe and inevitable impurity.
Further, contain the C of 0.17 according to weight proportion, the Si of≤0.02, the Mn of 0.85, the P of≤0.015, the S of≤0.01, the Als of 0.04, surplus is Fe and inevitable impurity.
The production method of above-mentioned hot rolled strip, comprises the steps:
(1) hot metal pretreatment;
（2）BOF；
(3) Argon;
(4) LF refining;
(5) continuous casting;
(6) heat;
(7) rolling;
(8) batch;
(9) rewinding.
Further, in step (1), molten iron carries out desulfurization process; And/or step comprises cooling step after (7) further, adopt back segment section cooling pattern.
Further, in step (7), roughing mill two frames, first is rolled 3 times back and forth, and second is rolled 5 times back and forth, finishing mill seven frame.
Further, the continuously cast bloom after step (5) directly enters the soaking pit of 1200 DEG C or 1250 DEG C.
Further, hot rolling after soaking, carries out after hot rolling cooling, batching, and oiler temperature control is at 650 DEG C, or the product of thickness >=16mm, coiling temperature lowers 20 DEG C.
Further, molten steel intermediate blank is thickness 45mm.
Further, finish rolling finishing temperature 890 DEG C.
Compared with currently available technology, the present invention develops the hot rolled strip of silicone content≤0.03, and due to the Composition Control of ultra-low silicon, this strip has better zinc-plated performance, is applicable to the production of zinc-plated tubulation.The production of this steel plate adopts ultra-low silicon composition and appropriate steel-making and suitable TMCP technique (hot metal pretreatment → RH → LF refining → continuous casting → heating → rolling → batch), produce when not affecting the mechanical properties, there is the hot rolled strip of good zinc-plated performance.Plate Production is by steel-making, continuous casting, heating, controlled rolling and controlled cooling, batches and produce with related process.
Specifically:
1) ultra-low silicon hot rolling of the present invention zinc-plated tubulation steel hot-rolled sheet band band has good chemical composition stability, surface quality.
2) according to more than yield strength 235MPa, more than tensile strength 360MPa in the mechanical property of steel plate of as above method production, more than ballistic work 37J.
3) through technology measuring and calculating, absorbed costs is 3243.04 yuan/ton, exceeds 323.03 yuan/ton than the absorbed costs (2920.01 yuan/ton) of straight carbon steel Q235B.
Accompanying drawing explanation
Fig. 1 is Si control of element situation
Fig. 2 is mechanical property schematic diagram
Fig. 3 is metallographic structure: ferrite+perlite+micro-bainite
（a）100X（b）500X
Embodiment
Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
In a preferred embodiment, those following steps are adopted: the technological process of production of hot metal pretreatment → BOF → Argon → LF refining → continuous casting → heating → rolling → batch → rewinding (thickness≤below 4.0mm drops into smooth).
3 points are mainly considered in this kind of technical process:
1) zinc-plated raw material is to the requirement of purity of steel;
2) rewinding contributes to surface quality inspection, and improves Thin Specs plate shape;
3) export contract is to the requirement of quality product and performance.
Shown in chemical composition claimed range sees the following form:
Ladle chemistry wt%
Composition Design adopts five large conventional element.
The reason generally causing Si content in LF stove refining process to increase sharply reduces and causes due to slag Fe and O content.The mechanical property of Si element on galvanized sheet does not affect, and just can reduce the zinc-plated viscosity of sheet material in galvanizing process, therefore reduce the zinc-plated performance of steel plate.And Si element is very easily oxidized, can affect the surface quality of slab thus improve zinc-plated performance, in production process, operational requirement is high.
Molten iron must carry out desulfurization process, and therefore S content target call controls below 0.010%.Converter uses iron block as far as possible less, and improve high-quality steel scrap ratio (steel scrap rate is accounting heavy 21.8Kg t in molten steel), the sulphur high phenomenon avoiding iron block to cause, alleviates the desulfurization task of special stove, refining further.
LF smelting technology is optimized, adjustment refining slag material proportioning, in line with the principle reducing SiO2 activity, cancel aluminium vanadine synthetic slag slag material, improve fluorite grade, reduce the add-on of refining aluminium in early stage, avoid occurring the refining phenomenon that early stage, O sharply declined, employing be CaO-Al2O3-SiO2 slag system, proportioning is respectively 45%-55%, 15%-20%, 10%-20%.
Alleviate the desulfurization task of LF, smelting cycle shortens, and obviously can reduce molten steel and return silicon amount, the refining of LF stove, and improve raw material quality, in refining slag, SiO2 controls within 6%; Increase the desulfurizing iron degree of depth and ratio, reduce LF stove desulfurization burden, improve and add waste steel quality.
Molten steel reaches as above chemical composition, then through controlled rolling and controlled cooling.
Adopt balanced load allocation model, finish rolling compression ratio calculates by >=3.0 according to finish rolling compression ratio with the ratio of finish rolling exit thickness by the >=thickness of 3.0(steel billet finishing mill entrance, and finish rolling draft is 3-1/3=67%), employing back segment section cooling pattern.
Roughing mill pressure pattern is 3+5 pattern, and finishing mill seven frame all comes into operation (under normal circumstances)
Soaking temperature 1250 DEG C, finish rolling finishing temperature 890 DEG C, coiling temperature 650 DEG C, the product of thickness >=16mm, coiling temperature suitably lowers 20 DEG C, and the difference that coils of hot-rolled steel thickness requires according to finished product can adjust.
Must strictly control to draw element in casting process, select weak cooling curve, stablize, take effect crystallizer cooling water inflow.
Si control of element situation as shown in Figure 1.
Molten steel intermediate blank is thickness 45mm, and continuously cast bloom directly enters 1200 DEG C of soaking pits, hot rolling after soaking, hot roller repairing, batches, and oiler temperature control is at 650 DEG C.
Coiled sheet workpiece thickness controls by finish rolling compression ratio > 3 ~ 5.
Roller repairing adopts leading portion section cooling pattern.
Coiling temperature has certain influence to yield strength, the results are shown in Table 2.
Table 2 hot-rolling coiling temperature is on the impact of yield strength performance
Mechanical property as shown in Figure 2.
1) steel band that table 1 describes different intensity grades adopts different chemical compositions, employing be the alloy mode that ultra-low silicon adds five large elements.
2) Fig. 1 describes the control situation of Si element in actual production, controls all right as can be seen from Figure 1.
3) Fig. 2 describes the control situation of mechanical property in actual production, and from a few stove test-results, yield strength, tensile strength, unit elongation all can reach 310MPa, 460MPa, more than 37%.
4) table 2 shows, under this kind of chemical composition condition, mechanical property is by the obvious effect of coiling temperature.Reduce with coiling temperature, in mechanical property, intensity has the trend of rising.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that method of the present invention is conceived and technical scheme is carried out; or directly apply to other occasion, all within protection scope of the present invention without improving.
Claims (4)
1. a production method for hot rolled strip, is characterized in that, comprises the steps:
(1) hot metal pretreatment;
（2）BOF；
(3) Argon;
(4) LF refining;
(5) continuous casting;
(6) heat;
(7) rolling;
(8) batch;
(9) rewinding;
Described hot rolled strip contains the C of 0.17 according to weight proportion, the Si of≤0.02, the Mn of 0.85, the P of≤0.015, the S of≤0.01, the Als of 0.04, and surplus is Fe and inevitable impurity;
LF refinery practice is optimized, adjustment refining slag material proportioning, employing be CaO-Al
2o
3-SiO
2slag system;
In step (1), molten iron carries out desulfurization process; And/or step comprises cooling step after (7) further, adopt back segment section cooling pattern;
In step (7), roughing mill two frames, first is rolled 3 times back and forth, and second is rolled 5 times back and forth, finishing mill seven frame;
Continuously cast bloom after step (5) directly enters the soaking pit of 1200 DEG C or 1250 DEG C;
Molten steel intermediate blank is thickness 45mm.
2. the production method of hot rolled strip as claimed in claim 1, it is characterized in that, hot rolling after soaking, carry out after hot rolling cooling, batching, oiler temperature control is at 650 DEG C.
3. the production method of hot rolled strip as claimed in claim 2, it is characterized in that, the product of thickness >=16mm, coiling temperature lowers 20 DEG C.
4. the production method of hot rolled strip as claimed in claim 1, is characterized in that, finish rolling finishing temperature 890 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310705115.6A CN103741019B (en) | 2013-12-19 | 2013-12-19 | A kind of hot rolled strip and production method thereof |
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| CN201310705115.6A CN103741019B (en) | 2013-12-19 | 2013-12-19 | A kind of hot rolled strip and production method thereof |
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| CN103741019A CN103741019A (en) | 2014-04-23 |
| CN103741019B true CN103741019B (en) | 2016-04-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107254638B (en) * | 2017-06-01 | 2019-07-02 | 马鞍山钢铁股份有限公司 | A kind of line steel hot rolling steel band and its production method with erosive wear resistant performance |
| CN108118258B (en) * | 2017-11-29 | 2019-10-18 | 德龙钢铁有限公司 | A kind of production method of strip used for galvanized tube |
| CN111485067B (en) * | 2020-05-25 | 2022-04-29 | 浙江澄宇环保新材料股份有限公司 | Slag former for steel refining and preparation method thereof |
| CN114643279A (en) * | 2022-01-29 | 2022-06-21 | 安阳钢铁股份有限公司 | Method for controlling shape of ultrathin ultra-wide steel strip for continuous galvanizing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914724A (en) * | 2010-09-02 | 2010-12-15 | 唐山国丰钢铁有限公司 | Substrate for strapping band |
| CN101956126A (en) * | 2010-09-30 | 2011-01-26 | 河北钢铁股份有限公司邯郸分公司 | Cold-base high-strength galvanized sheet and production method thereof |
| CN103276287A (en) * | 2013-06-08 | 2013-09-04 | 济钢集团有限公司 | Cold-rolled steel strip for high-drawing-performance flux-cored wire, and making method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3391194B2 (en) * | 1996-10-16 | 2003-03-31 | 日本鋼管株式会社 | Method for producing high-strength hot-dip galvanized steel sheet with excellent surface properties |
| JP2000204462A (en) * | 1999-01-12 | 2000-07-25 | Kawasaki Steel Corp | Galvanized steel sheet and production of galvannealed steel sheet |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914724A (en) * | 2010-09-02 | 2010-12-15 | 唐山国丰钢铁有限公司 | Substrate for strapping band |
| CN101956126A (en) * | 2010-09-30 | 2011-01-26 | 河北钢铁股份有限公司邯郸分公司 | Cold-base high-strength galvanized sheet and production method thereof |
| CN103276287A (en) * | 2013-06-08 | 2013-09-04 | 济钢集团有限公司 | Cold-rolled steel strip for high-drawing-performance flux-cored wire, and making method thereof |
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