CN102747277B - Method for producing Q345 heat rolling plate rolls with excellent performance by low silicon low manganese - Google Patents
Method for producing Q345 heat rolling plate rolls with excellent performance by low silicon low manganese Download PDFInfo
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Abstract
The invention relates to a method for producing Q345 heat rolling plate rolls with excellent performance by low silicon low manganese, which relates to the heat rolling plate rolls production technical field. The technology scheme comprises the steps of smelting, LF refining, continuous casting, heating and rolling; the steel comprises the chemical composition by mass percentage (unit: wt%): 0.10-0.20 of C, less than or equal to 0.08 of Si, less than or equal to 0.6Mn, less than or equal to 0.015% of S, less than or equal to 0.020 of P, 0.010-0.050% of Als, 0.020-0.080 of Ti and the balance of Fe and residual element. The traditional Q345 uses a component design with high manganese, and has the disadvantages of high cost, easy segregation and poor weldability. The Q345 steel component can greatly reduce the silicon manganese alloy content of the steel, and conventional alloy Al and Ti are properly added, a component design system with low manganese low silicon is usd, internal quality problem due to carbon manganese segregation can be reduced, the carbon equivalent can be reduced and the welding performance can be improved, the reinforcement can be carried out by using the conventional alloy Al and Ti, and the produced steel plate has more excellent mechanical properties, and the production cost is low.
Description
Technical field
The production method that the present invention relates to the Q345 hot-rolled sheet coil of the low manganese excellent property of a kind of low silicon, belongs to hot-rolled sheet coil production technical field.
Background technology
High-strength low-alloy steel Q345 is widely used in bridge, vehicle, boats and ships, building, pressurized vessel etc., along with the fast development of national economy, to need to day by day increasing of Q345 steel, is one of main steel grade of consumption maximum on market.At present, the Q345 steel series of producing on market, is all to strengthen as main alloy using manganese substantially, and the add-on of manganese is between 0.9-1.5%.Along with the development of modern industry, the continuous progress of science and technology, the application of various alloying elements in steel plate is also more extensive, and GB GB/T1594-2008 is to low-alloy high-tensile structural steel, and the bound of having cancelled manganese content limits, and has only specified the upper limit.For the detection of Q345 steel, be whether the constituent content of steel reaches requirement on the one hand, be whether the mechanical mechanics property (yield strength, tension test) of steel reaches standard on the one hand.
In background technology, the patent documentation of producing about Q345 steel grade has: publication number 102041431A provides a kind of thickness specification low-alloy series Q345B below 50mm to protect flaw detection steel plate and production method thereof, the Composition Design of this steel plate is (unit, wt%): C≤0.18, Si≤0.45, Mn≤1.40, P≤0.018, S≤0.005, Ti≤0.020, Als≤0.015, other are Fe and relict element.This Q345B substantially still adopts the traditional high silicon Composition Design of high manganese route, has increased a small amount of microalloy, does not possess the Composition Design characteristic and performance cost advantage of the low silicon of low manganese.Publication number 102345062A provides the following specification of a kind of 20mm to protect flaw detection low-alloy Q345 steel plate, this steel plate Composition Design is (unit, wt/%): C:0.010-0.18, Si:0.25-0.45, Mn :≤1.20, P≤0.025, S :≤0.010, Ti:0.005-0.020, Als:0.005-0.045, Ni≤0.1, Nb≤0.05, other are Fe and residual element.This Q345 steel plate still adopts the Composition Design route of the high silicon of high manganese, has increased precious alloy Nb, and Ni improves plate property, does not possess the Composition Design characteristic and performance cost advantage of the low silicon of low manganese.Publication number 10236754A provides a kind of 65mmQ345GJCZ35 steel plate, this steel plate Composition Design is (unit, wt/%): C:0.09-0.18, Si:0.20-0.40, Mn:1.20-1.60, P≤0.018, S≤0.005, Ti:0.010-0.030, Nb:0.015-0.050, Als:0.015-0.050, other are Fe and relict element.This Q345GJCZ35 steel plate adopts the Composition Design route of the high silicon of high manganese, has increased precious alloy Nb etc. and has improved plate property, does not possess the Composition Design characteristic and performance cost advantage of the low silicon of low manganese.
Summary of the invention
The object of the invention is to provide the production method of the Q345 hot-rolled sheet coil of the low manganese excellent property of a kind of low silicon, utilize conventional alloy A l, Ti strengthening, do not need to add the precious alloys such as Nb, Ni, V, can reach the required mechanical property of steel, and owing to adopting the low silicon Composition Design of low manganese, can alleviate manganese segregation and improve plate quality, can also reduce carbon equivalent and improve weldability; Meanwhile, owing to adopting micro-conventional Al, Ti alloy to strengthen, also there is advantage cheaply, solve the problems referred to above that background technology exists.
Technical solution of the present invention is:
The production method of the Q345 hot-rolled sheet coil of the low manganese excellent property of a kind of low silicon, comprise smelting, LF refining, continuous casting, heating, rolling process, the chemical composition mass percent of steel following (unit, wt%): C:0.10-0.20, Si :≤0.08, Mn≤0.6, S≤0.015, P≤0.020, Als:0.010-0.050, Ti:0.020-0.080, other is Fe and residual element.
Described smelting procedure, adopts converter or electrosmelting, enters stove molten iron temperature and is not less than 1250 DEG C; Endpoint molten steel composition range C:0.06-0.012%, P≤0.015%, tapping temperature are not less than 1650 DEG C; In tapping process, add ferromanganese and aluminium block to carry out deoxidation alloying.
Described LF refining procedure, the omnidistance Argon of refining stirs; Electrode power supply heats up; Carry out desulfurization, sulphur content is controlled at S≤0.012%, in refining process, by ferromanganese, alloying constituent is adjusted in span of control, and manganese content is controlled at Mn≤0.6, and silicone content is controlled at Si≤0.08; The refining later stage is adjusted to 0.010-0.050%(unit by Als in molten steel, wt% by feeding Al line), then by adding ferrotianium or feeding titanium wire and Ti is adjusted to 0.020-0.080%(unit, wt%), finally feed Ca and process.
Described continuous casting working procedure, middle bag superheat of liquid steel is controlled at 25 ± 5 DEG C; The casting of continuous casting whole process protection, be no more than ± 5mm of liquid level fluctuation of crystallizer.
Described heating process, slab heating temperature is 1150-1300 DEG C.
Described rolling process, roughing start rolling temperature 1050-1200 DEG C; Finish rolling finishing temperature 850-920 DEG C; Coiling temperature 580-680 DEG C.
Described smelting procedure, adopts molten iron pre-desulfurization technique, and the molten iron drossing that arrives at a station is through pre-desulfurized molten iron S≤0.015%.
Compared with the production method of the present invention and existing Q345, tool has the following advantages: (1) adopts the low manganese Composition Design of low silicon, can alleviate the component segregation that Gao Meng causes, and carbon equivalent is low, can improve weldability.(2) adopt conventional alloy A l, Ti strengthening, does not need to add high manganese and precious alloy Nb, Ni, and V etc., and mechanical property excellence, homogeneity of structure is better, and grain fineness number is thinner.(3) there is low-cost advantage.
Embodiment
Embodiment 1:
Produce Q345B, the pre-desulfurized molten iron S=0.015% of the molten iron drossing that arrives at a station, converter enters 1250 DEG C of stove molten iron temperatures, 1650 DEG C of converter terminal C:0.012%, P:0.015%, molten steel temperatures; Molten steel enters LF refining after adding ferromanganese and aluminium block deoxidation alloying, omnidistance Bottom Argon Stirring, heated by electrodes temperature adjustment, basicity of slag 3.0, desulfurization to 0.008%, in refining process, add ferromanganese Mn is adjusted to 0.60%, the refining later stage feeds aluminum steel and regulates in molten steel Als to add ferrotianium after 0.050% Ti is adjusted to 0.020%, finally feeds Ca processing; In continuous casting, wrap 20 DEG C of superheat of liquid steel, whole process protection casting; 1150 DEG C of slab heating temperature, 1050 DEG C of start rolling temperatures, 850 DEG C of final rolling temperatures, 580 DEG C of coiling temperatures, make the thick hot-rolled sheet coil of 6mm.
Mass percent chemical composition (unit, the wt%) detected result of the present embodiment is as follows: C:0.20, Si:0.02, Mn:0.60, S:0.008, P:0.015, Als:0.050, Ti:0.020, other is Fe and residual element; Mechanical property detected result: yield strength 485MPa, tensile strength 555MPa, 27%, 20 DEG C of normal temperature ballistic work 85J of unit elongation, properties all meets GB requirement.
Embodiment 2:
Produce Q345C, converter enters 1300 DEG C of stove molten iron temperatures, 1720 DEG C of converter terminal C:0.006%, P:0.015%, molten steel temperatures; Molten steel enters LF refining after adding ferromanganese and aluminium block deoxidation alloying, omnidistance Bottom Argon Stirring, heated by electrodes temperature adjustment, basicity of slag 4.0, desulfurization to 0.012%, in refining process, add ferromanganese Mn is adjusted to 0.10%, the refining later stage feeds aluminum steel and regulates in molten steel Als to add ferrotianium after 0.010% Ti is adjusted to 0.080%, finally feeds Ca processing; In continuous casting, wrap 30 DEG C of superheat of liquid steel, whole process protection casting; 1300 DEG C of slab heating temperature, 1200 DEG C of start rolling temperatures, 920 DEG C of final rolling temperatures, 680 DEG C of coiling temperatures, make the thick hot-rolled sheet coil of 15mm.
Mass percent chemical composition (unit, the wt%) detected result of the Q345C hot-rolled sheet coil of the low manganese of this low silicon is as follows: C:0.10, Si:0.08, Mn:0.30, S:0.015, P:0.020, Als:0.010, Ti:0.080, other are Fe and residual element; Mechanical property detected result: yield strength 458MPa, tensile strength 575MPa, 25%, 0 DEG C of ballistic work 92J of unit elongation, properties all meets GB requirement.
Embodiment 3:
Produce Q345D, the pre-desulfurized molten iron S=0.005% of the molten iron drossing that arrives at a station, converter enters 1250 DEG C of stove molten iron temperatures, 1680 DEG C of converter terminal C:0.06%, P:0.008%, molten steel temperatures; Molten steel enters LF refining after adding ferromanganese and aluminium block deoxidation alloying, omnidistance Bottom Argon Stirring, heated by electrodes temperature adjustment, basicity of slag 5.0, desulfurization to 0.005%, in refining process, add ferromanganese Mn is adjusted to 0.20%, the refining later stage feeds aluminum steel and regulates in molten steel Als to add ferrotianium after 0.045% Ti is adjusted to 0.025%, finally feeds Ca processing; In continuous casting, wrap 28 DEG C of superheat of liquid steel, whole process protection casting; 1250 DEG C of slab heating temperature, 1150 DEG C of start rolling temperatures, 870 DEG C of final rolling temperatures, 630 DEG C of coiling temperatures, make the thick hot-rolled sheet coil of 12mm.
Mass percent chemical composition (unit, the wt%) detected result of the Q345D hot-rolled sheet coil of the low manganese of this low silicon is as follows: C:0.19, Si:0.02, Mn:0.45, S:0.006, P:0.010, Als:0.040, Ti:0.025, other are Fe and residual element; Mechanical property detected result: yield strength 465MPa, tensile strength 575MPa, unit elongation 29% ,-20 DEG C of ballistic work 68J, properties all meets GB requirement.
Claims (4)
1. the production method of the Q345 hot-rolled sheet coil of the low manganese excellent property of low silicon, it is characterized in that comprising smelting, LF refining, continuous casting, heating, rolling process, the chemical composition mass percent of steel following (unit, wt%): C:0.10-0.20, Si :≤0.08, Mn≤0.6, S≤0.015, P≤0.020, Als:0.010-0.050, Ti:0.020-0.080, other is Fe and residual element;
Described smelting procedure, adopts converter or electrosmelting, enters stove molten iron temperature and is not less than 1250 DEG C; Endpoint molten steel composition range C:0.06-0.012%, P≤0.015%, tapping temperature are not less than 1650 DEG C; In tapping process, add ferromanganese and aluminium block to carry out deoxidation alloying;
Described LF refining procedure, the omnidistance Argon of refining stirs; Electrode power supply heats up; Carry out desulfurization, sulphur content is controlled at S≤0.012%, in refining process, by ferromanganese, alloying constituent is adjusted in span of control, and manganese content is controlled at Mn≤0.6, and silicone content is controlled at Si≤0.08; The refining later stage is adjusted to 0.010-0.050%(unit by Als in molten steel, wt% by feeding Al line), then by adding ferrotianium or feeding titanium wire and Ti is adjusted to 0.020-0.080%(unit, wt%), finally feed Ca and process.
2. the production method of the Q345 hot-rolled sheet coil of the low manganese excellent property of a kind of low silicon according to claim 1, is characterized in that described continuous casting working procedure, and middle bag superheat of liquid steel is controlled at 25 ± 5 DEG C; The casting of continuous casting whole process protection, be no more than ± 5mm of liquid level fluctuation of crystallizer.
3. according to the production method of the Q345 hot-rolled sheet coil of the low manganese excellent property of a kind of low silicon described in claim 1 or 2, it is characterized in that described heating process, slab heating temperature is 1150-1300 DEG C; Described rolling process, roughing start rolling temperature 1050-1200 DEG C; Finish rolling finishing temperature 850-920 DEG C; Coiling temperature 580-680 DEG C.
4. according to the production method of the Q345 hot-rolled sheet coil of the low manganese excellent property of a kind of low silicon described in claim 1 or 2, it is characterized in that described smelting procedure, adopt molten iron pre-desulfurization technique, the molten iron drossing that arrives at a station is through pre-desulfurized molten iron S≤0.015%.
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| CN201210185183.XA CN102747277B (en) | 2012-06-07 | 2012-06-07 | Method for producing Q345 heat rolling plate rolls with excellent performance by low silicon low manganese |
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| CN103468871B (en) * | 2013-09-06 | 2015-07-08 | 鞍钢股份有限公司 | Method for preventing Q345B straight-loading plate blank from cold bending cracks |
| CN104342601B (en) * | 2014-11-17 | 2017-03-22 | 武汉钢铁(集团)公司 | Ti-containing low-manganese and low-silicon hot-rolled steel with Rel being greater than or equal to 400MPa and production method adopting CSP (cast steel plate) |
| CN105200317B (en) * | 2015-09-23 | 2017-12-01 | 舞阳钢铁有限责任公司 | Controlled rolling type containing Ti 345MPa ranks low alloy steel plate and its production method |
| CN105401048B (en) * | 2015-11-20 | 2018-06-05 | 吉林建龙钢铁有限责任公司 | A kind of inexpensive preparation process for reducing Q345B/C banded structures |
| 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 |
| 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 |
| CN106834885B (en) * | 2016-12-30 | 2018-11-06 | 日照钢铁控股集团有限公司 | The method for producing Thin Specs Q345 Series Steels based on ESP bar strip continuous casting and rolling flow paths |
| CN107287515A (en) * | 2017-06-09 | 2017-10-24 | 唐山不锈钢有限责任公司 | Low-temperature impact-resistant height extension Q345E hot-strips and production method |
| 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 |
| CN115786814B (en) * | 2023-01-13 | 2023-06-06 | 山西建龙实业有限公司 | Preparation process of high-strength low-alloy structural steel and hot-rolled steel strip thereof |
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| CN102041447A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q345C steel plate and production method thereof |
| CN102041431A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q345B protected flaw detection steel plate and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0660346B2 (en) * | 1987-03-02 | 1994-08-10 | 日本鋼管株式会社 | High-strength steel pipe fitting manufacturing method |
| JPH0759738B2 (en) * | 1988-10-17 | 1995-06-28 | 新日本製鐵株式会社 | Ultra-high-strength PC steel wire or steel bar excellent in uniform elongation and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041447A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q345C steel plate and production method thereof |
| CN102041431A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q345B protected flaw detection steel plate and production method thereof |
Non-Patent Citations (2)
| Title |
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| JP平2-107743A 1990.04.19 |
| JP昭63-213620A 1988.09.06 |
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