CN104928580A - Low-Mn hot rolled steel and preparation method thereof - Google Patents
Low-Mn hot rolled steel and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of hot continuous rolling plates and strips, and particularly relates to a low-cost low-Mn hot rolled steel plate for a Q345 low-alloy high-strength structure and a preparation method thereof. Low-Mn hot rolled steel comprises, by weight, the chemical components of 0.10 percent to 0.22 percent of C, Si smaller than or equal to 0.35 percent, 0.10 percent to 0.40 percent of Mn, 0,030 percent to 0.060 percent of Ti, P smaller than or equal to 0.025 percent, S smaller than or equal to 0.025 percent and the balance Fe and inevitable impurities. The microscopic structure of the low-Mn hot rolled steel is a ferrite and pearlite structure. The low-Mn hot rolled steel is simple in process control and low in production cost, the Mn content of produced Q345 low-alloy high-strength is greatly lower than the conventional content, microalloy elements Ti are added, yield strength is larger than or equal to 345 MPa, strength of extension is 470 MPa to 630 MPa, and ductility A is larger than or equal to 20 percent.
Description
Technical field
The invention belongs to hot continuous rolling strip technical field, be specifically related to Q345 low-alloy high-strength structure low Mn hot-rolled steel sheet and preparation method thereof of a kind of low cost.
Background technology
Low-alloy high-tensile structural steel refers in general carbon steel, to add a small amount of or trace alloying element, by formulating suitable cooling controlling and rolling controlling process, thus obtains the hot-rolled steel sheet of the high strength more more excellent than normal carbon Steel Properties, high tenacity and cold-forming ability.Because the alloying element total amount added in steel is few, this kind of steel alloy belongs to low alloy steel, usually use under hot-rolled state, the market demand of the low-alloy high-tensile structural steel (trade mark: Q345) of wherein yield strength >=345MPa level is maximum, GB/T1591-2008 to the chemical composition of Q345 low-alloy high-tensile structural steel and mechanical property requirements in table 1.
The chemical composition of table 1 Q345 low-alloy high-tensile structural steel and mechanical property
Remarks: as required, can add other alloying element such as Nb, V, Ti.
The domestic and international industrial production to Q345 low-alloy high-tensile structural steel and product application aspect have some achievements in research.
Application number is " 200710113915.3 ", denomination of invention is " method using medium thin slab rolling thick specification low-alloy structure steel plate ", disclose the technique that the high-strength hot-rolled roll bending of think gauge 16 ~ 20mm produced by the thick continuously cast bloom of a kind of use 150 ~ 170mm, the chemical composition of steel is: C:0.15 ~ 0.20%, Si:0.20 ~ 0.40%, Mn:1.40 ~ 1.60%, P :≤0.030%, S :≤0.030%, all the other are Fe and trace impurity; Finished product mechanical property is yield strength >=350MPa, tensile strength >=500MPa, unit elongation >=21%.
Application number is " 201010165553.4 ", denomination of invention is " a kind of production method of hot-rolled steel sheet ", disclose to adopt and reduce hot rolling finishing temperature, rapid cooling+section cooling pattern and reduce the technology measures such as coiling temperature, success reduces the Mn content of Q345 to 0.60%-0.80%, its chemical composition is C:0.10%-0.22%, Si :≤0.35%, Mn:0.60%-0.80%, P :≤0.025%, S :≤0.025%, finished product mechanical property is yield strength >=350MPa, tensile strength >=500MPa, unit elongation >=20%.
Application number is " 201310414988.1 ", and denomination of invention is " a kind of hot-rolled dual-phase steel and production method thereof ", discloses a kind of C:0.12 ~ 0.20%, Si:0.15 ~ 0.35%, Mn:0.75 ~ 1.30%, P :≤0.020%, S :≤0.010%, all the other are Fe and trace impurity; Finished product mechanical property is yield strength >=330MPa, tensile strength >=600MPa, unit elongation >=24%, and yield tensile ratio is 0.5 ~ 0.7.
The people such as Zhu Fu Xian are in the process study of Q345 plate of moderate thickness " under the controlled rolling and controlled cooling condition " literary composition, the impact of Q345 low alloy steel austenite recrystallization behavior on structure and properties is studied, its chemical composition is C:0.17%, Si:0.35%, Mn:1.48%, P≤0.021%, S≤0.008%, finished product mechanical property is yield strength 396MPa, tensile strength 569MPa.
Visible, the research emphasis of related data on Q345 low-alloy high-strength structural steel concentrates on welding property, processability, austenite recrystallization shape are on aspects such as the impacts of structure and properties, each enterprise is in order to ensure that the intensity of Q345 low-alloy high-strength hot rolled steel plate meets standard-required, main alloy element Mn content controls the higher level 0.75 ~ 1.60% substantially, or reduction Mn content is produced by the mode that cooling+section cooling and low temperature batch fast.
Summary of the invention
First technical problem to be solved by this invention is to provide the low Mn hot-rolled steel that a kind of cost is lower, stable mechanical property, processability are excellent.
A kind of low Mn hot-rolled steel, its chemical composition is C 0.10 ~ 0.22%, Si≤0.35%, Mn 0.10 ~ 0.40%, Ti 0.030 ~ 0.060%, P≤0.025%, S≤0.025% by weight percentage, and surplus is Fe and inevitable impurity; The microstructure of described low Mn hot-rolled steel is ferrite+pearlitic texture.
The low Mn hot-rolled steel of one described above, the yield strength ReL >=345MPa of steel, tensile strength Rm:470 ~ 630MPa, unit elongation A >=20.0%.
Further, as preferred technical scheme, the low Mn hot-rolled steel of one described above, its chemical composition is by weight percentage: C 0.13%, Si 0.19%, Mn 0.37%, Ti 0.058%, P 0.021%, S 0.008%, surplus is Fe and inevitable impurity; The yield strength ReL 462MPa of steel, tensile strength Rm 608MPa, unit elongation A 24.5%.
The present invention when Q345 low-alloy high-strength hot rolled steel plate Mn content by routine 0.75 ~ 1.60% higher level be significantly reduced to 0.10 ~ 0.40%, with the addition of the tiny alloying element Ti of 0.030 ~ 0.060%, the loss of strength caused because Mn content reduces is made up by precipitation strength, thus produce the lower Q345 low-alloy high-strength hot rolled steel plate of cost, the microstructure of hot-rolled steel is ferrite+pearlitic texture.
Second technical problem to be solved by this invention is to provide a kind of preparation method of low Mn hot-rolled steel.
Wherein, comprise the following steps:
A, after conventional desulfurizing iron and converter smelting, ensure molten steel composition be by weight percentage: C 0.10 ~ 0.22%, Si≤0.35%, Mn 0.10 ~ 0.40%, Ti 0.030 ~ 0.060%, P≤0.025%, S≤0.025%, surplus is Fe and inevitable impurity;
B, by the molten steel after above-mentioned process, roll into the continuously cast bloom that 200 ~ 230mm is thick, soaking at 1200 DEG C ~ 1260 DEG C, soaking time >=180min;
C, the slab after b step soaking is first adopted 3 ~ 7 passage roughing, rolling into thickness is 30 ~ 60mm intermediate blank, then carries out finish rolling through 4 ~ 7 frames, and finishing temperature is 850 ~ 900 DEG C;
D, the slab after step c rolling is cooled to 680 ~ 740 DEG C with the speed of cooling of 10 ~ 50 DEG C/s, air cooling 5 ~ 9s, then is cooled to 580 ~ 640 DEG C with the speed of cooling of 10 ~ 50 DEG C/s, curling, obtain ferrite+perlitic steel tissue.
Further, one described above low Mn hot-rolled steel Preparation Method, in wherein said b step, continuously cast bloom soaking temperature is preferably 1207 DEG C.
Further, in step c described above, after roughing, workpiece thickness is preferably 59mm, and finishing temperature is preferably 895 DEG C.
Further, the slab in Step d described above after rolling is preferably 38 DEG C/s with speed of cooling, is cooled to 685 DEG C, and after air cooling 5s, the more preferred speed of cooling with 11 DEG C/s is cooled to 587 DEG C, batches.
The present invention adopts low Mn, add the chemical composition of tiny alloying element Ti produces, and continuously cast bloom is organized as ferrite+pearlitic hot-rolled steel sheet through roughing-finish rolling-cooling-air cooling-section cooling fast-batch to produce.Its yield strength >=345MPa, tensile strength 470 ~ 630MPa, unit elongation A >=20%.
Beneficial effect of the present invention is as follows:
1, the Mn content of the Q345 Hi-Stren steel of the present invention's production is significantly reduced to 0.10 ~ 0.40% by 0.75 ~ 1.60% of routine, with the addition of the tiny alloying element Ti of 0.030 ~ 0.060%, the effect giving full play to Ti precipitation strength ensure that the intensity of hot-rolled steel, its yield strength >=345MPa, tensile strength 470 ~ 630MPa, unit elongation A >=20%, meets the requirement of GB GB/T1591-2008.
2, be cooled to 680 ~ 740 DEG C with the speed of cooling of 10 ~ 50 DEG C/s after the present invention controls finish rolling, batch in the temperature range being cooled to 580 ~ 640 DEG C with the speed of cooling of 10 ~ 50 DEG C/s again after air cooling 5 ~ 9s.Can make the air cooling stage like this, Ti separates out if having time, comparatively large to raising intensity contribution, and owing to being sub-sectional cooling, and thickness direction has and cools-rise again process, and thickness direction homogeneity of structure is better.
3, the present invention also has the feature that technology controlling and process is simple, production cost is low.
Embodiment
A kind of low Mn hot-rolled steel, its chemical composition is C 0.10 ~ 0.22%, Si≤0.35%, Mn 0.10 ~ 0.40%, Ti 0.030 ~ 0.060%, P≤0.025%, S≤0.025% by weight percentage, and surplus is Fe and inevitable impurity; The microstructure of described low Mn hot-rolled steel is ferrite+pearlitic texture.
The low Mn hot-rolled steel of one described above, the yield strength ReL >=345MPa of steel, tensile strength Rm:470 ~ 630MPa, unit elongation A >=20.0%.
Further, as preferred technical scheme, the low Mn hot-rolled steel of one described above, its chemical composition is by weight percentage: C 0.13%, Si 0.19%, Mn 0.37%, Ti 0.058%, P 0.021%, S 0.008%, surplus is Fe and inevitable impurity; The yield strength ReL 462MPa of steel, tensile strength Rm 608MPa, unit elongation A 24.5%.
The present invention when Q345 low-alloy high-strength hot rolled steel plate Mn content by routine 0.75 ~ 1.60% higher level be significantly reduced to 0.10 ~ 0.40%, with the addition of the tiny alloying element Ti of 0.030 ~ 0.060%, the loss of strength caused because Mn content reduces is made up by precipitation strength, thus produce the lower Q345 low-alloy high-strength hot rolled steel plate of cost, the microstructure of hot-rolled steel is ferrite+pearlitic texture.
A preparation method for low Mn hot-rolled steel, wherein, comprises the following steps:
A, after conventional desulfurizing iron and converter smelting, ensure molten steel composition be by weight percentage: C 0.10 ~ 0.22%, Si≤0.35%, Mn 0.10 ~ 0.40%, Ti 0.030 ~ 0.060%, P≤0.025%, S≤0.025%, surplus is Fe and inevitable impurity;
B, by the molten steel after above-mentioned process, roll into the continuously cast bloom that 200 ~ 230mm is thick, soaking at 1200 DEG C ~ 1260 DEG C, soaking time >=180min;
C, the slab after b step soaking is first adopted 3 ~ 7 passage roughing, rolling into thickness is 30 ~ 60mm intermediate blank, then carries out finish rolling through 4 ~ 7 frames, and finishing temperature is 850 ~ 900 DEG C;
D, the slab after step c rolling is cooled to 680 ~ 740 DEG C with the speed of cooling of 10 ~ 50 DEG C/s, air cooling 5 ~ 9s, then is cooled to 580 ~ 640 DEG C with the speed of cooling of 10 ~ 50 DEG C/s, curling, obtain ferrite+perlitic steel tissue.
Further, one described above low Mn hot-rolled steel Preparation Method, in wherein said b step, continuously cast bloom soaking temperature is preferably 1207 DEG C.
Further, in step c described above, after roughing, workpiece thickness is preferably 59mm, and finishing temperature is preferably 895 DEG C.
Further, the slab in Step d described above after rolling is preferably 38 DEG C/s with speed of cooling, is cooled to 685 DEG C, and after air cooling 5s, the more preferred speed of cooling with 11 DEG C/s is cooled to 587 DEG C, batches.
The present invention adopts low Mn, add the chemical composition of tiny alloying element Ti produces, and continuously cast bloom is organized as ferrite+pearlitic hot-rolled steel sheet through roughing-finish rolling-cooling-air cooling-section cooling fast-batch to produce.Its yield strength >=345MPa, tensile strength 470 ~ 630MPa, unit elongation A >=20%.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
The chemical component weight per-cent of Q345 low-alloy high-strength hot rolled steel plate is C:0.16%, Si:0.24%, Mn:0.15%, P:0.017%, S:0.013%, Ti:0.047%, and surplus is Fe and inevitable impurity element composition; The thick continuous casting steel billet of 200mm is cast into conventional continuous cast method; Be heated to 1227 DEG C and carry out roughing, after roughing, intermediate slab thickness is at 38mm; Finishing temperature is 882 DEG C; Be cooled to 725 DEG C with the cooling rate of 27 DEG C/s after finish rolling, after air cooling 8s, then be cooled to 610 DEG C to batch with the cooling rate of 15 DEG C/s; Its finished product mechanical property is yield strength 413MPa, tensile strength 533MPa, unit elongation 28.5%.
Embodiment 2
The chemical component weight per-cent of Q345 low-alloy high-strength hot rolled steel plate is C:0.13%, Si:0.19%, Mn:0.37%, P:0.021%, S:0.008%, Ti:0.058%, and surplus is Fe and inevitable impurity element composition; The thick continuous casting steel billet of 230mm is cast into conventional continuous cast method; Be heated to 1207 DEG C and carry out roughing, after roughing, intermediate slab thickness is at 59mm; Finishing temperature scope is 895 DEG C; Be cooled to 685 DEG C with the cooling rate of 38 DEG C/s after finish rolling, after air cooling 5s, then be cooled to 587 DEG C to batch with the cooling rate of 11 DEG C/s; Its finished product mechanical property is yield strength 462MPa, tensile strength 608MPa, unit elongation 24.5%.
Embodiment 3
The chemical component weight per-cent of Q345 low-alloy high-strength hot rolled steel plate is C:0.18%, Si:0.11%, Mn:0.25%, P:0.011%, S:0.005%, Ti:0.032%, and surplus is Fe and inevitable impurity element composition; The thick continuous casting steel billet of 210mm is cast into conventional continuous cast method; Be heated to 1245 DEG C and carry out roughing, after roughing, intermediate slab thickness is at 46mm; Finishing temperature scope is 853 DEG C; Be cooled to 733 DEG C with the cooling rate of 19 DEG C/s after finish rolling, after air cooling 9s, then be cooled to 637 DEG C to batch with the cooling rate of 23 DEG C/s; Its finished product mechanical property is yield strength 367MPa, tensile strength 481MPa, unit elongation 30.0%.
Claims (7)
1. a low Mn hot-rolled steel, is characterized in that: its chemical composition is C 0.10 ~ 0.22%, Si≤0.35%, Mn 0.10 ~ 0.40%, Ti 0.030 ~ 0.060%, P≤0.025%, S≤0.025% by weight percentage, and surplus is Fe and inevitable impurity; The microstructure of described low Mn hot-rolled steel is ferrite+pearlitic texture.
2. a kind of low Mn hot-rolled steel according to claim 1, is characterized in that: the yield strength ReL >=345MPa of steel, tensile strength Rm:470 ~ 630MPa, unit elongation A >=20.0%.
3. a kind of low Mn hot-rolled steel according to claim 1 or 2, it is characterized in that: its chemical composition is by weight percentage: C 0.13%, Si 0.19%, Mn 0.37%, Ti 0.058%, P 0.021%, S 0.008%, surplus is Fe and inevitable impurity; The yield strength ReL 462MPa of steel, tensile strength Rm 608MPa, unit elongation A 24.5%.
4. the preparation method of a kind of low Mn hot-rolled steel described in any one of claims 1 to 3, is characterized in that: comprise the following steps:
A, after conventional desulfurizing iron and converter smelting, ensure molten steel composition be by weight percentage: C 0.10 ~ 0.22%, Si≤0.35%, Mn 0.10 ~ 0.40%, Ti 0.030 ~ 0.060%, P≤0.025%, S≤0.025%, surplus is Fe and inevitable impurity;
B, by the molten steel after above-mentioned process, roll into the continuously cast bloom that 200 ~ 230mm is thick, soaking at 1200 DEG C ~ 1260 DEG C, soaking time >=180min;
C, the slab after b step soaking is first adopted 3 ~ 7 passage roughing, rolling into thickness is 30 ~ 60mm intermediate blank, then carries out finish rolling through 4 ~ 7 frames, and finishing temperature is 850 ~ 900 DEG C;
D, the slab after step c rolling is cooled to 680 ~ 740 DEG C with the speed of cooling of 10 ~ 50 DEG C/s, air cooling 5 ~ 9s, then is cooled to 580 ~ 640 DEG C with the speed of cooling of 10 ~ 50 DEG C/s, curling, obtain ferrite+perlitic steel tissue.
5. the preparation method of a kind of low Mn hot-rolled steel according to claim 4, is characterized in that: in described b step, continuously cast bloom soaking temperature is 1207 DEG C.
6. the preparation method of a kind of low Mn hot-rolled steel according to claim 4, it is characterized in that: in described step c, after roughing, workpiece thickness is 59mm, finishing temperature is 895 DEG C.
7. the preparation method of a kind of low Mn hot-rolled steel according to claim 4, is characterized in that: the slab in described Step d after rolling is 38 DEG C/s with speed of cooling, is cooled to 685 DEG C, after air cooling 5s, then be cooled to 587 DEG C with the speed of cooling of 11 DEG C/s, batch.
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| CN105112775A (en) * | 2015-10-10 | 2015-12-02 | 攀钢集团攀枝花钢铁研究院有限公司 | High-formability hot-rolled steel plate and production method thereof |
| 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 |
| CN105624382A (en) * | 2016-03-11 | 2016-06-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolling method for V-Ti microalloyed steel |
| CN105734419A (en) * | 2016-03-11 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | V and Ti micro-alloy steel and smelting method and application thereof |
| CN106636938A (en) * | 2017-01-09 | 2017-05-10 | 山东钢铁集团日照有限公司 | Low-cost and high-moldability low-alloy and high-strength steel and manufacturing method thereof |
| CN107287383A (en) * | 2016-03-30 | 2017-10-24 | 本钢板材股份有限公司 | A kind of method that Q345B microalloyings improve intensity |
| CN107904500A (en) * | 2017-11-17 | 2018-04-13 | 安阳钢铁股份有限公司 | A kind of Bending Processing low alloy hot rolling roll bending and preparation method thereof |
| CN108754104A (en) * | 2018-06-20 | 2018-11-06 | 北京首钢股份有限公司 | A method of eliminating the flat volume defect of 590Mpa rank dual phase steel hot rollings |
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| CN113981319A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-alloy-cost high-strength steel for automobile wheels and preparation method thereof |
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2015
- 2015-07-10 CN CN201510400687.2A patent/CN104928580A/en active Pending
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| 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 |
| CN105624382A (en) * | 2016-03-11 | 2016-06-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolling method for V-Ti microalloyed steel |
| CN105734419A (en) * | 2016-03-11 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | V and Ti micro-alloy steel and smelting method and application thereof |
| CN107287383A (en) * | 2016-03-30 | 2017-10-24 | 本钢板材股份有限公司 | A kind of method that Q345B microalloyings improve intensity |
| CN106636938A (en) * | 2017-01-09 | 2017-05-10 | 山东钢铁集团日照有限公司 | Low-cost and high-moldability low-alloy and high-strength steel and manufacturing method thereof |
| CN107904500A (en) * | 2017-11-17 | 2018-04-13 | 安阳钢铁股份有限公司 | A kind of Bending Processing low alloy hot rolling roll bending and preparation method thereof |
| CN108754104A (en) * | 2018-06-20 | 2018-11-06 | 北京首钢股份有限公司 | A method of eliminating the flat volume defect of 590Mpa rank dual phase steel hot rollings |
| CN113564450A (en) * | 2021-07-29 | 2021-10-29 | 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 |
| CN113981319A (en) * | 2021-10-28 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-alloy-cost high-strength steel for automobile wheels and preparation method thereof |
| CN115961201A (en) * | 2022-12-08 | 2023-04-14 | 南京钢铁股份有限公司 | Preparation method of economical high-phosphorus low-alloy high-strength steel |
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Application publication date: 20150923 |