CN103741019A - Hot rolled steel strip and production method thereof - Google Patents
Hot rolled steel strip and production method thereof Download PDFInfo
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- CN103741019A CN103741019A CN201310705115.6A CN201310705115A CN103741019A CN 103741019 A CN103741019 A CN 103741019A CN 201310705115 A CN201310705115 A CN 201310705115A CN 103741019 A CN103741019 A CN 103741019A
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- rolled strip
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 14
- 238000007670 refining Methods 0.000 claims description 11
- 238000005098 hot rolling Methods 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052710 silicon Inorganic materials 0.000 abstract description 15
- 239000010703 silicon Substances 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 14
- 238000009628 steelmaking Methods 0.000 abstract description 6
- 238000005266 casting Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 14
- 239000002893 slag Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to a hot rolled steel strip and a production method thereof. A hot rolled strip of which the silicon content is less than or equal to 0.03% is developed and comprises the following components in percentage by weight: 0.15-0.19% of C, less than or equal to 0.03% of Si, 0.7-0.9% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.03-0.05% of Als and the balance of Fe and inevitable impurities. Due to the control of ultralow silicon content, the strip has relatively good galvanization performance and is suitable for production of galvanized pipes. The production of the steel plate adopts a process which has ultralow silicon content and appropriate steel-making and is suitable for TMCP (thermal mechanical control processing), so that the hot rolled strip with relatively good galvanization performance under the condition that the mechanical properties are not influenced is produced. The steel plate is produced through steel making, continuous steel casting, heating, TMCP, coiling and a 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 production method thereof with good zinc-plated performance, this product is 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, zinc-plated raw material is stricter to the requirement of purity of steel, adopt and reduce the Si constituent content in steel band as far as possible, can improve the zinc-plated property of steel band, it is a difficult point in producing that the chemical element of ultra-low silicon is controlled.The domestic production to ultra-low silicon composition steel band at present often has the phenomenon that exceeds internal control, standard to exist, 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 reduced the Si content in molten steel and reduced back silicon amount by optimized production process, and in the follow-up operation of rolling, needs to make up low silicon by appropriate production technique and steel strength is caused to the impact of undercapacity.
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, produces in the situation that not affecting the mechanical properties, and has the hot rolled strip of good zinc-plated performance.Plate Production is by steel-making, continuous casting, heating, controlled rolling and controlled cooling, batches with related process and produce.
Concrete technical scheme is as follows:
A hot rolled strip, its zinc-plated tubulation steel hot rolled strip that is silicone content≤0.03.
Further, the C that contains 0.15-0.19 according to weight proportion ,≤0.03 Si, the Mn of 0.7-0.9 ,≤0.020 P ,≤0.015 S, the Als of 0.03-0.05, surplus is Fe and inevitable impurity.
Further, according to weight proportion, contain 0.17 C ,≤0.02 Si, 0.85 Mn ,≤0.015 P ,≤0.01 S, 0.04 Als, 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) heating;
(7) rolling;
(8) batch;
(9) rewinding.
Further, in step (1), molten iron carries out desulfurization processing; And/or step further comprises cooling step after (7), adopt back segment laminar flow cooling mode.
Further, in step (7), two frames of roughing mill, first rolls 3 times back and forth, and second is rolled 5 times back and forth, finishing mill seven frames.
Further, the continuously cast bloom after step (5) directly enters the soaking pit of 1200 ℃ or 1250 ℃.
Further, hot rolling after soaking, after hot rolling, carry out cooling, batch, coiling temperature is controlled at 650 ℃, or, the product of thickness >=16mm, coiling temperature is lowered 20 ℃.
Further, molten steel intermediate blank is thickness 45mm.
Further, 890 ℃ of finish rolling finishing temperatures.
Compare 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 in the situation that 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 with related process and produce.
Specifically:
1) the zinc-plated tubulation steel hot-rolled sheet of ultra-low silicon hot rolling of the present invention band band has good chemical composition stability, surface quality.
2) in the mechanical property of steel plate of producing according to as above method yield strength 235MPa above, more than tensile strength 360MPa, more than ballistic work 37J.
3) through technology measuring and calculating, absorbed costs is 3243.04 yuan/ton, than the absorbed costs of straight carbon steel Q235B (2920.01 yuan/ton), exceeds 323.03 yuan/ton.
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, adopt that following steps: the technological process of production of hot metal pretreatment → BOF → Argon → LF refining → continuous casting → heating → rolling → batch → rewinding (thickness≤4.0mm drops into smooth below).
3 points are mainly considered in this kind of technical process:
1) requirement of zinc-plated raw material to purity of steel;
2) rewinding contributes to surface quality inspection, and improves thin dimension board shape;
3) requirement of export contract to quality product and performance.
Shown in chemical composition claimed range sees the following form:
Molten steel chemical composition wt%
On Composition Design, adopt five large conventional elements.
Generally cause reason that Si content in LF stove refining process increases because slag Fe and O content sharply reduce and cause.Si element, on the not impact of the mechanical property of galvanized sheet, just can reduce the zinc-plated viscosity of sheet material in galvanizing process, therefore reduces the zinc-plated performance of steel plate.And Si element is very easily oxidized, thereby the surface quality that can affect slab is improved zinc-plated performance, and in production process, operational requirement is high.
Molten iron must carry out desulfurization processing, so S content target call is controlled at below 0.010%.Iron block is used in converter as far as possible less, improves high-quality steel scrap ratio (steel scrap rate is the heavy 21.8Kg of accounting t in molten steel), and the high phenomenon of sulphur of avoiding iron block to cause, further alleviates the desulfurization task of special stove, refining.
On LF smelting technology, be optimized, adjust refining slag material proportioning, in line with the principle that reduces 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%.
The desulfurization task that has alleviated LF, smelting cycle shortens, and can obviously reduce molten steel and return silicon amount, and the refining of LF stove, improves raw material quality, and in refining slag, SiO2 is controlled in 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 passes through controlled rolling and controlled cooling.
Adopt balanced load allocation model, the press >=thickness of 3.0(steel billet finishing mill entrance of finish rolling compression ratio calculates by >=3.0 according to finish rolling compression ratio with the ratio of finish rolling exit thickness, and finish rolling draft is 3-1/3=67%), adopt back segment laminar flow cooling mode.
It is 3+5 pattern that roughing mill is depressed pattern, and finishing mill seven frames all come into operation (under normal circumstances)
1250 ℃ of soaking temperatures, 890 ℃ of finish rolling finishing temperatures, 650 ℃ of coiling temperatures, the product of thickness >=16mm, coiling temperature is suitably lowered 20 ℃, and the difference that coils of hot-rolled steel thickness requires according to finished product can be adjusted.
In casting process, must strictly control and draw element, select weak cooling curve, the crystallizer cooling water inflow of stablizing, take effect.
Si control of element situation as shown in Figure 1.
Molten steel intermediate blank is thickness 45mm, and continuously cast bloom directly enters 1200 ℃ of soaking pits, and hot rolling after soaking is cooling after hot rolling, batch, and coiling temperature is controlled at 650 ℃.
Coiled sheet workpiece thickness is controlled by finish rolling compression ratio > 3～5.
Roll rear cooling employing leading portion laminar flow cooling mode.
Coiling temperature has certain influence to yield strength, the results are shown in Table 2.
The impact of table 2 hot rolling reeling temperature on yield strength performance
Mechanical property as shown in Figure 2.
1) table 1 has illustrated that the steel band of different intensity grades adopts different chemical compositions, employing be the alloy mode that ultra-low silicon adds five large elements.
2) Fig. 1 has illustrated the control situation of Si element in actual production, controls as can be seen from Figure 1 all right.
3) Fig. 2 has illustrated 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 subject to the obvious effect of coiling temperature.With coiling temperature, reduce, in mechanical property, intensity has the trend of rising.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (10)
1. a hot rolled strip, is characterized in that, its zinc-plated tubulation steel hot rolled strip that is silicone content≤0.03.
2. hot rolled strip as claimed in claim 1, is characterized in that, the C that contains 0.15-0.19 according to weight proportion, and≤0.03 Si, the Mn of 0.7-0.9 ,≤0.020 P ,≤0.015 S, the Als of 0.03-0.05, surplus is Fe and inevitable impurity.
3. hot rolled strip as claimed in claim 1 or 2, is characterized in that, contains 0.17 C according to weight proportion ,≤0.02 Si, and 0.85 Mn ,≤0.015 P ,≤0.01 S, 0.04 Als, surplus is Fe and inevitable impurity.
4. the production method of hot rolled strip as described in claim 1-3, is characterized in that, comprises the steps:
(1) hot metal pretreatment;
（2）BOF；
(3) Argon;
(4) LF refining;
(5) continuous casting;
(6) heating;
(7) rolling;
(8) batch;
(9) rewinding.
5. the production method of hot rolled strip as claimed in claim 4, is characterized in that, in step (1), molten iron carries out desulfurization processing; And/or step further comprises cooling step after (7), adopt back segment laminar flow cooling mode.
6. the production method of the hot rolled strip as described in claim 4 or 5, is characterized in that, in step (7), and two frames of roughing mill, first rolls 3 times back and forth, and second is rolled 5 times back and forth, finishing mill seven frames.
7. the production method of the hot rolled strip as described in any one in claim 4-6, is characterized in that, the continuously cast bloom after step (5) directly enters the soaking pit of 1200 ℃ or 1250 ℃.
8. the production method of hot rolled strip as claimed in claim 7, is characterized in that, hot rolling after soaking, after hot rolling, carry out cooling, batch, coiling temperature is controlled at 650 ℃, or, the product of thickness >=16mm, coiling temperature is lowered 20 ℃.
9. the production method of hot rolled strip as claimed in claim 7, is characterized in that, molten steel intermediate blank is thickness 45mm.
10. the production method of hot rolled strip as claimed in claim 6, is characterized in that, 890 ℃ of finish rolling finishing temperatures.
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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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| Publication Number | Publication Date |
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| CN103741019A true CN103741019A (en) | 2014-04-23 |
| CN103741019B CN103741019B (en) | 2016-04-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107254638A (en) * | 2017-06-01 | 2017-10-17 | 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 |
| CN108118258A (en) * | 2017-11-29 | 2018-06-05 | 德龙钢铁有限公司 | A kind of production method of strip used for galvanized tube |
| CN111485067A (en) * | 2020-05-25 | 2020-08-04 | 浙江澄宇环保新材料股份有限公司 | Novel 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 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107254638A (en) * | 2017-06-01 | 2017-10-17 | 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 |
| CN108118258A (en) * | 2017-11-29 | 2018-06-05 | 德龙钢铁有限公司 | A kind of production method of strip used for galvanized tube |
| 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 |
| CN111485067A (en) * | 2020-05-25 | 2020-08-04 | 浙江澄宇环保新材料股份有限公司 | Novel slag former for steel refining and preparation method thereof |
| 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 |
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