CN103320691A - Manufacturing method for Q345 series coil plates - Google Patents
Manufacturing method for Q345 series coil plates Download PDFInfo
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- CN103320691A CN103320691A CN201310171061XA CN201310171061A CN103320691A CN 103320691 A CN103320691 A CN 103320691A CN 201310171061X A CN201310171061X A CN 201310171061XA CN 201310171061 A CN201310171061 A CN 201310171061A CN 103320691 A CN103320691 A CN 103320691A
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Abstract
The present invention relates to a manufacturing method for Q345 series coil plates. The method sequentially comprises the following steps: 1, KR hot metal pretreatment, 2, steelmaking through a converter, 3, LF refining, 4, calcium line feeding, 5, slab casting, 6, heating through a heating furnace, 7, hot rolling, 8, cooling, and 9, coiling. The method is characterized in that after KR hot metal pretreatment, steelmaking through a converter, LF refining and calcium line feeding are performed and LF smelting is completed, Mn content in the molten steel is 0.30-0.50% and Ti content in the molten steel is 0.025-0.045%; during a hot rolling process, a fine rolling finishing temperature is controlled to 850-880 DEG C; and during coiling, a coiling temperature is controlled to 560-610 DEG C. In addition, the manufacturing method has characteristics of low cost and good quality.
Description
Technical field
The present invention relates to a kind of manufacture method of Q345 series roll bending, specifically is the manufacture method of Q345A, Q345B and Q345C rolled steel plate.
Background technology
Q345A, Q345B, Q345C steel are typical low alloy steel, and the structure iron the widest for present Chinese purposes, that consumption is maximum needs to guarantee higher and stable tensile strength, elongation and impelling strength.Q345 series low-alloy steel is because C content between 0.10%-0.20%, belongs to peritectic steel.According to GB713 and the requirement of GB/T1591-2008 composition, lower control limit has been cancelled in main steel grades control, is become by original lower limit 1.20% such as Mn content and does not do control, lays the foundation for reducing cost of alloy.
Existing Q345 series roll bending manufacture method adopts the content of high manganese Composition Design for the physical strength of Effective Raise steel in the Q345 Series Steel, increased manufacturing cost.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing Q345 series roll bending manufacture method, the invention provides a kind of lower-cost Q345 series roll bending manufacture method.
The present invention is according to relevant bibliographys such as " Second Phase Precipitations of steel ", increase effectively crystal grain thinning and improve the physical strength of steel of titanium content in the low alloy steel, be approximately the titanium of every increase by 0.01%, tensile strength lifting 30MPa, and manganese content is every reduction by 0.01%, and tensile strength reduces 1MPa.Therefore the two has substitutability.Therefore by adding titanium elements displacement manganese element in the steel, significantly reduce cost of alloy and Plate Production cost.
Core of the present invention at first is by adjusting Q345A, Q345B, Q345C roll bending steel rolling temperature, increase the trace amount of titanium element, and improve titanium content to 0.025-0.045%, significantly reduce manganese element content in the steel, Mn content by dropping to 0.30-0.50% more than 1.3%, is comprehensively reduced the steel plate cost.Adjust finishing temperature and the curling temperature of rolling temperature, the especially finish rolling of steel billet, strengthen TMCP control effect, improve the steel plate obdurability, alleviate the banded structure rank of hot rolled coil.
The manufacture method of this Q345 series roll bending comprises following step successively:
IThe KR hot metal pretreatment,
IIConverter steelmaking,
IIIThe LF refining,
IVHello calcium line,
VThe slab cast,
VIThe process furnace heating,
VIIHot rolling
, VIIIThe cooling with
IXBatch, it is characterized in that: warp
IThe KR hot metal pretreatment,
IIConverter steelmaking,
IIIThe LF refining with
IVFeed calcium line, after LF smelts end, the weight percent Mn:0.30-0.50% of composition in the molten steel, Ti:0.025-0.045%;
VIIIn the course of hot rolling, the finish rolling finishing temperature is controlled at 850～880 ℃;
IXBatch is that curling temperature is controlled at 560～610 ℃.
The steps characteristic of the manufacture method of this Q345 series roll bending is:
IThe KR hot metal pretreatment
The KR hot metal pretreatment finishes, and the weight percent that enters the content of S, C and P in the converter molten iron is:
S ≤0.005 %；C 3.80～
4.0%：P ≤ 1.00%；
IIConverter steelmaking
Converter steelmaking in the temperature of terminal point is
1580～1620 ℃, in ladle, to press composition in the tapping process and add ferro-aluminum, ferromanganese, ferrotianium, the weight percent of the composition of molten steel is behind the Converter:
C [A1] ～0.18%; Si 0.05～0.20; Mn 0.28～
0.45； P ≤ 0.015 %； S ≤ 0.012 %； Al
T 0.02～0.06： Ti 0.025～0.045；
All the other are Fe and inevitable impurity.
IIIThe LF refining
According to the gap alloying constituent fine setting (Ti, Mn, Si, C) of the composition that enters the LF stove and finished product composition, the weight percent of the composition of molten steel is after the fine setting:
C 0.15～0.19; Si 0.08～0.20; Mn 0.30～0.50； P ≤ 0.015 %； S ≤ 0.012 %； Al
T 0.02～0.05： Ti 0.025～0.045；
All the other are Fe and inevitable impurity.
The refining end temp is 1565～1578 ℃, and refining cycle is-42[A2] minute;
IVFeed calcium line:
For further deoxidation and make inclusion modification, feeding Si-Ca line 2.8～3.2[A3 before the LF departures]/ton, weak churning time is no less than 5min(ladle bottom blowing argon gas intensity and molten steel is not exposed in the atmosphere be as the criterion after the line feeding).
VThe slab cast
Continuous casting becomes continuously cast bloom.
VIThe process furnace heating
At step heating-furnace heating steel billet to 1160～[A4] ℃;
VIIHot rolling
Billet rolling is become the band steel of 1.2 ~ 25.4mm at hot tandem rolling mill, 1110～1190 ℃ of roughing breaking down temperature, finishing temperature 990～[A5] ℃; 980～1020 ℃ of finish rolling breaking down temperature, 850～880 ℃ of finish rolling finishing temperatures; The finish rolling total deformation is equal to or greater than 80%.
VIIICooling
Adopt the leading portion cooling mode, speed of cooling is 20 ℃/S-25 ℃/S; Guarantee to batch the temperature of requirement.
IXBatch
560～610 ℃ of coiling temperatures.
Then check
Warehouse-in after the check.
Carbon steel thickness 1.5～12.7mm of the present invention, width range is 900～1380mm.2250mm hot-rolling line carbon steel thickness 1.2 ~ 25.4mm, width 1000 ~ 2130mm.
Beneficial effect of the present invention
Steel plate organizational aspects: increase the weight of the manganese composition weight of Banded Structure of Steel Plate by reduction, increase the titanium elements of crystal grain thinning, evenly the steel plate tissue.Long-term follow is checked the product that dispatches from the factory, and one time properties percent of pass reaches more than 99%, and the over-all properties qualification rate reaches 100%.Judge according to welding crack sensibility index in the standard, use cracking to take a turn for the better, the welding crack sensibility exponential formula is seen lower.In the actual procedure control, unsolder does not occur split problem, use properties is stable.
Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B
Annotate: only added C, Si, Mn, Ti among the present invention, the equal water of all the other compositions is less than 0.10%.The present invention has reduced Mn, has increased Ti, all is conducive to the raising of welding property.The actual performance index sees the following form 1:
Table 1
In the above-mentioned table, Q345A, Q345B are that normal temperature impacts; Q345C is 0 ℃ of impact.
The present invention significantly reduces cost of alloy and Plate Production cost by adding titanium elements displacement manganese element in the steel.According to manganese alloy in 2012 and titanium alloy price variance, ton steel cost reduces by 54 yuan.With present Q345A, Q345B, the market supply of Q345C coil of strip more than 30000 tons, 1,500,000 yuan of year benefits.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
The present embodiment is the manufacture method of Q345A roll bending.
The present embodiment comprises following step successively:
IThe KR hot metal pretreatment
The KR hot metal pretreatment finishes, and the weight percent that enters the content of S in the converter molten iron is 0.004 %; The weight percent of the composition of molten steel is:
C：[A6] ; P 0.80%； S 0.004%；
All the other are Fe and inevitable impurity.
IIConverter steelmaking
Converter steelmaking is 1596 ℃ in the temperature of terminal point, presses composition in the tapping process and add ferro-aluminum, ferromanganese, ferrotianium in ladle, and the weight percent of the composition of molten steel is behind the Converter:
C 0.10%; Si 0.12 %; Mn 0.45 %； P 0.014 %；
S 0.008 %； Al
T 0.05 %： Ti 0.035 %；
All the other are Fe and inevitable impurity.
IIIThe LF refining
According to the gap alloying constituent fine setting (Ti, Mn, Si, C) of the composition that enters the LF stove and finished product composition, the weight percent of the composition of molten steel is after the fine setting:
C 0.16%; Si 0.12 %; Mn 0.42 %； [A7] ；
S 0.010 %； Al
T 0.037 %： Ti 0.031 %；
All the other are Fe and inevitable impurity.
The refining end temp is 1568 ℃, and refining cycle is 40 minutes;
IVFeed calcium line:
For further deoxidation and make inclusion modification, feeding Si-Ca line oven [A8] before the LF departures, weak churning time 5min(ladle bottom blowing argon gas intensity is not exposed in the atmosphere molten steel to be as the criterion after the line feeding).
VThe slab cast
Continuous casting growth 8200mm, wide 1240 mm, the continuously cast bloom of thick 220 mm.
VIThe process furnace heating
At step heating-furnace heating steel billet to 1245 ℃
VIIHot rolling
Billet rolling is become the band steel of 3.5mm at hot tandem rolling mill, 1160 ℃ of roughing breaking down temperature, 1040 ℃ of finishing temperatures; 1010 ℃ of finish rolling breaking down temperature, 860 ℃ of finish rolling finishing temperatures; Finish rolling total deformation 82%.
VIIICooling
Adopt the leading portion cooling mode, speed of cooling is 20 ℃/S; Guarantee to batch the temperature of requirement.
IXBatch
Coiling temperature [A9]～573 ℃.
XCheck
180 ° of pliability tests are d=2a or d=3a according to thickness, and are qualified.
Other performance perameter of check sees Table 2.
Warehouse-in after the check.
Embodiment two
The present embodiment is the manufacture method of Q345B roll bending.
The present embodiment comprises following step successively:
IThe KR hot metal pretreatment
The KR hot metal pretreatment finishes, and the weight percent that enters the content of S in the converter molten iron is 0.003 %; The weight percent of the composition of molten steel is:
C：3.98%; P：0.53%； S：0.003%；
All the other are Fe and inevitable impurity.
IIConverter steelmaking
Converter steelmaking is 1598 ℃ in the temperature of terminal point, presses composition in the tapping process and add ferro-aluminum, ferromanganese, ferrotianium in ladle, and the weight percent of the composition of molten steel is behind the Converter:
C 0.09%; Si 0.10 %; Mn [A10] ；P 0.011 %； S 0.006 %；Al
T 0.045 %： Ti 0.037 %；
All the other are Fe and inevitable impurity.
IIIThe LF refining
According to the gap alloying constituent fine setting (Ti, Mn, Si, C) of the composition that enters the LF stove and finished product composition, the weight percent of the composition of molten steel is after the fine setting:
C 0.15%; Si 0.12 %; Mn 0.46 %；P 0.011 %；
S 0.005 %；Al
T 0.040 %： Ti 0.033 %；
All the other are Fe and inevitable impurity.
The refining end temp is 1566 ℃, and refining cycle is 38 minutes;
IVFeed calcium line
For further deoxidation and make inclusion modification, feeding Si-Ca line 169m/ stove before the LF departures, weak churning time 6 min(ladle bottom blowing argon gas intensity are not exposed in the atmosphere molten steel to be as the criterion after the line feeding).
VThe slab cast
Continuous casting growth 8210mm, wide 1260 mm, the continuously cast bloom of thick 220 mm.
VIThe process furnace heating
At step heating-furnace heating steel billet to 1235 ℃
VIIHot rolling
Billet rolling is become the band steel of 3.75mm at hot tandem rolling mill, 1154 ℃ of roughing breaking down temperature, finishing temperature ℃ [A11]; 1015 ℃ of finish rolling breaking down temperature, 861 ℃ of finish rolling finishing temperatures; Finish rolling total deformation 83%.
VIIICooling
Adopt the leading portion cooling mode, speed of cooling is 22 ℃/S;
IXBatch
585 ℃ of coiling temperatures.
XCheck
180 ° of pliability tests are d=2a or d=3a according to thickness, and are qualified.
Other performance perameter of check sees Table 2.
Warehouse-in after the check.
Embodiment three
The present embodiment is the manufacture method of Q345C roll bending.
The present embodiment comprises following step successively:
IThe KR hot metal pretreatment
The KR hot metal pretreatment finishes, and the weight percent that enters the content of S in the converter molten iron is 0.004 %; The weight percent of the composition of molten steel is:
C：[A12] P：0.45%； S：0.003%；
All the other are Fe and inevitable impurity.
IIConverter steelmaking
Converter steelmaking is 1603 ℃ in the temperature of terminal point, presses composition in the tapping process and add ferro-aluminum, ferromanganese, ferrotianium in ladle, and the weight percent of the composition of molten steel is behind the Converter:
C 0.07%; Si 0.10 %; Mn 0.44 %；P 0.012 %； S 0.008 %；Al
T 0.029 %： Ti 0.029 %；
All the other are Fe and inevitable impurity.
IIIThe LF refining
Weight percent according to the composition of molten steel after gap alloying constituent fine setting (Ti, Mn, Si, the C) fine setting of the composition that enters the LF stove and finished product composition is:
C 0.18%; Si 0.12 %; Mn 0.46 %；P 0.013 %；
S 0.008 %；Al
T 0.032 %： Ti 0.031 %；
All the other are Fe and inevitable impurity.
The refining end temp is [A13] ℃, and refining cycle is 41 minutes;
IVFeed calcium line
For further deoxidation and make inclusion modification, feeding Si-Ca line 241m/ stove before the LF departures, weak churning time 6 min(ladle bottom blowing argon gas intensity are not exposed in the atmosphere molten steel to be as the criterion after the line feeding).
VThe slab cast
Continuous casting growth 8210mm, wide 1280 mm, the continuously cast bloom of thick 220 mm.
VIThe process furnace heating
At step heating-furnace heating steel billet to 1248 ℃
VIIHot rolling
Billet rolling is become the band steel of 9mm at hot tandem rolling mill, 1144 ℃ of roughing breaking down temperature, 1033 ℃ of finishing temperatures; 1012 ℃ of finish rolling breaking down temperature, 858 ℃ of finish rolling finishing temperatures; Finish rolling total deformation 82%.
VIIICooling
Adopt the leading portion cooling mode, speed of cooling is 22 ℃/S;
IXBatch
605 ℃ of coiling temperatures.
XCheck
180 ° of pliability tests are d=2a or d=3a according to thickness, and are qualified.
Its performance perameter of check sees Table 2.
Warehouse-in after the check.
Table 2
Maximum 0.1 among the embodiment, minimum 0.07
Individual scope should be arranged, and comprise 38 and 41 of embodiment.
Can not be the value value of determining, individual scope must be arranged.
Can not be less than embodiment, embodiment is 1248 and 1245
Must be greater than the numerical value of embodiment.
Embodiment can not surpass summary of the invention 4..0, and the revision for execution example is relatively good.
Can not be greater than summary of the invention 0.015
(size of cancellation stove does not do a good job in can occur misreading.
Can not be less than 560 of invention
Can not surpass 0.45 of summary of the invention
Summary of the invention is revised as 1040, embodiment must be less than 1040
Can not be less than 3.8 of summary of the invention
Lower limit 1565 greater than invention.
Claims (2)
1. the manufacture method of Q345 series roll bending, it comprises following step successively:
IThe KR hot metal pretreatment,
IIConverter steelmaking,
IIIThe LF refining,
IVHello calcium line,
VThe slab cast,
VIThe process furnace heating,
VIIHot rolling
, VIIIThe cooling with
IXBatch, it is characterized in that: warp
IThe KR hot metal pretreatment,
IIConverter steelmaking,
IIIThe LF refining with
IVFeed calcium line, after LF smelts end, the weight percent Mn:0.30-0.50% of composition in the molten steel, Ti:0.025-0.045%;
VIIIn the course of hot rolling, the finish rolling finishing temperature is controlled at 850～880 ℃;
IXBatch is that curling temperature is controlled at 560～610 ℃.
2. the manufacture method of Q345 according to claim 1 series roll bending, its steps characteristic is:
IThe KR hot metal pretreatment
The KR hot metal pretreatment finishes, and the weight percent that enters the content of S, C and P in the converter molten iron is:
S ≤0.005 %；C 3.80～
4.0%：P ≤ 1.00%；
IIConverter steelmaking
Converter steelmaking is 1580～1620 ℃ in the temperature of terminal point, presses composition in the tapping process and add ferro-aluminum, ferromanganese, ferrotianium in ladle, and the weight percent of the composition of molten steel is behind the Converter:
C [A1] ～0.18%; Si 0.05～0.20; Mn 0.28～
0.45； P ≤ 0.015 %； S ≤ 0.012 %； Al
T 0.02～0.06： Ti 0.025～0.045；
All the other are Fe and inevitable impurity;
IIIThe LF refining
According to the gap alloying constituent fine setting of the composition that enters the LF stove and finished product composition, the weight percent of the composition of molten steel is after the fine setting:
C 0.15～0.19; Si 0.08～0.20; Mn 0.30～0.50； P ≤ 0.015 %； S ≤ 0.012 %； Al
T 0.02～0.05： Ti 0.025～0.045；
All the other are Fe and inevitable impurity;
The refining end temp is 1565～1578 ℃, and refining cycle is-42[A2] minute;
IVFeed calcium line:
For further deoxidation and make inclusion modification, feeding Si-Ca line 2.8～3.2[A3 before the LF departures]/ton, weak churning time is no less than 5min after the line feeding;
VThe slab cast
Continuous casting becomes continuously cast bloom;
VIThe process furnace heating
At step heating-furnace heating steel billet to 1160～[A4] ℃;
VIIHot rolling
Billet rolling is become the band steel of 1.2 ~ 25.4mm at hot tandem rolling mill, 1110～1190 ℃ of roughing breaking down temperature, finishing temperature 990～[A5] ℃; 980～1020 ℃ of finish rolling breaking down temperature, 850～880 ℃ of finish rolling finishing temperatures; The finish rolling total deformation is equal to or greater than 80%;
VIIICooling
Adopt the leading portion cooling mode, speed of cooling is 20 ℃/S-25 ℃/S; Guarantee to batch the temperature of requirement;
IXBatch
560～610 ℃ of coiling temperatures.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401048A (en) * | 2015-11-20 | 2016-03-16 | 吉林建龙钢铁有限责任公司 | Low-cost preparation process capable of reducing Q345B/C belt-shaped structure |
| CN105506453A (en) * | 2015-12-21 | 2016-04-20 | 南阳汉冶特钢有限公司 | Novel low-cost S355JR/J0 low alloy steel plate and production method thereof |
| CN105779872A (en) * | 2016-05-12 | 2016-07-20 | 本钢板材股份有限公司 | High-titanium and low-cost Q345B hot-rolled acid washing plate and production method thereof |
| WO2020030040A1 (en) * | 2018-08-08 | 2020-02-13 | Jiangsu Shagang Group Co., Ltd. | Production of twin-roll cast and hot rolled steel strip |
| CN115323269A (en) * | 2022-07-21 | 2022-11-11 | 阳春新钢铁有限责任公司 | Method for controlling cracks of Q235 round steel under high drawing speed condition |
| CN115786814A (en) * | 2023-01-13 | 2023-03-14 | 山西建龙实业有限公司 | High-strength low-alloy structural steel and preparation process of hot-rolled steel strip thereof |
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| CN113564450B (en) * | 2021-07-29 | 2022-08-09 | 唐山瑞丰钢铁（集团）有限公司 | Method for producing titanium microalloyed Q355B hot-rolled strip steel under non-refining condition |
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| CN102373383A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | X70 pipeline steel hot rolled coil and manufacture method thereof |
| CN102719743A (en) * | 2012-06-27 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Hot-rolled coil plate for oil casing and manufacturing method thereof |
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| CN102373383A (en) * | 2011-10-30 | 2012-03-14 | 山西太钢不锈钢股份有限公司 | X70 pipeline steel hot rolled coil and manufacture method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401048A (en) * | 2015-11-20 | 2016-03-16 | 吉林建龙钢铁有限责任公司 | Low-cost preparation process capable of reducing Q345B/C belt-shaped structure |
| CN105506453A (en) * | 2015-12-21 | 2016-04-20 | 南阳汉冶特钢有限公司 | Novel low-cost S355JR/J0 low alloy steel plate and production method thereof |
| CN105779872A (en) * | 2016-05-12 | 2016-07-20 | 本钢板材股份有限公司 | High-titanium and low-cost Q345B hot-rolled acid washing plate and production method thereof |
| CN105779872B (en) * | 2016-05-12 | 2018-06-15 | 本钢板材股份有限公司 | A kind of high titanium low cost Q345B hot rolling acid-cleaning plates and its production method |
| WO2020030040A1 (en) * | 2018-08-08 | 2020-02-13 | Jiangsu Shagang Group Co., Ltd. | Production of twin-roll cast and hot rolled steel strip |
| CN115323269A (en) * | 2022-07-21 | 2022-11-11 | 阳春新钢铁有限责任公司 | Method for controlling cracks of Q235 round steel under high drawing speed condition |
| CN115786814A (en) * | 2023-01-13 | 2023-03-14 | 山西建龙实业有限公司 | High-strength low-alloy structural steel and preparation process of hot-rolled steel strip thereof |
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