CN104018078A - Hot-rolled steel plate and production method thereof - Google Patents
Hot-rolled steel plate and production method thereof Download PDFInfo
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- CN104018078A CN104018078A CN201410273541.1A CN201410273541A CN104018078A CN 104018078 A CN104018078 A CN 104018078A CN 201410273541 A CN201410273541 A CN 201410273541A CN 104018078 A CN104018078 A CN 104018078A
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Abstract
The invention discloses a hot-rolled steel plate and a production method thereof. The hot-rolled steel plate comprises the following elements by weight percent: 0.05%-0.1% of carbon, less than 0.3% of silicon, 1.7%-1.9% of manganese, less than 0.02% of phosphorus, less than 0.01% of sulfur, 0.01%-0.03% of niobium, 0.1%-0.12% of titanium and 97.52%-98.14% of iron. The microstructure of the hot-rolled steel plate consists of a ferritic structure and a pearlitic structure. According to the hot-rolled steel plate, the reduction of the strength of the steel plate caused by change of the microstructure in a processing (such as welding) process can be avoided; and the hot-rolled steel plate can be used for automobile compartments with yield strength of 700MPa. In addition, the addition of noble elements such as Mo and Ni is avoided in the production method, and the preparation process is simple, so that the cost of the hot-rolled steel plate is reduced.
Description
Technical field
The present invention relates to a kind of hot-rolled steel sheet and production method thereof.
Background technology
Under the manufacturing process and state of the art of present stage, body lightening is the important means that solves heavy-load automobile over burdening and energy-saving and emission-reduction.Use High Strength Steel, by attenuate steel plate thickness with alleviate the weight of vehicle body, can under the prerequisite that reduces deadweight, improve product work-ing life.At present, domestic cargo truck is 16Mn and Q345B with the main steel of compartment board, and high strength compartment board consumption is less, compares compartment board weight exceed 15-20% with same kind of products at abroad.
In order to reduce production costs and to improve member security, high-strength vehicle compartment is with hot-rolled steel sheet exploitation to bring into schedule gradually, and Ge great steel mill also carries out the research work of this respect successively.For example, the Zhao Zhengzhi of University of Science & Technology, Beijing etc. has invented the preparation method (CN102787272A) of hot rolling acid-cleaning high-strength steel for a kind of motor vehicle body; High strength low alloy hot rolling ferrite bainite weathering resistant steel and the production method (CN101660099A) thereof of the just invention such as grade of being permitted to shake of Jiangsu Province Sha-Steel Steel & Iron Research Institute Co., Ltd.; A kind of technique (CN1785543A) of applying bar strip continuous casting and rolling flow path production Ti micro-alloying high-strength weathering steel plate of the new equality invention of hair of Zhujiang Iron and Steel Co Ltd, Guangzhou, etc.
Yet, in aforesaid method, generally added the expensive alloying element such as Mo, Cr, Ni, so the cost of hot-rolled steel sheet is still higher.And portioned product adopts continuous casting and rolling technique of sheet bar, low finishing temperature (as 800 ℃), low coiling temperature (as 320 ℃) and conventional process for cooling make to introduce in final finished tissue bainite or martensite strengthening, and these finished products can make microstructure change in the course of processing, cause the use properties of product unsatisfactory.
Therefore, be necessary to develop a kind of new and hot-rolled steel sheet and production method thereof cheaply.
Summary of the invention
The object of the invention is to overcome that automobile bodies in prior art is high with hot-rolled steel sheet cost, rolling technology is controlled the defect of complexity and bad adaptability, thereby a kind of hot-rolled steel sheet and production method thereof are provided.
According to a first aspect of the invention, the invention provides a kind of hot-rolled steel sheet, wherein, the gross weight of described hot-rolled steel sheet of take is benchmark, and the elementary composition of described hot-rolled steel sheet comprises: the elementary composition of described hot-rolled steel sheet comprises: the iron of the niobium of the manganese of the carbon of 0.05-0.1 % by weight, the silicon below 0.3 % by weight, 1.7-1.9 % by weight, the phosphorus below 0.02 % by weight, the sulphur below 0.01 % by weight, 0.01-0.03 % by weight, the titanium of 0.1-0.12 % by weight and 97.52-98.14 % by weight; The microstructure of described hot-rolled steel sheet is ferritic structure and pearlitic structure.
According to a second aspect of the invention, the invention provides the production method of above-mentioned hot-rolled steel sheet, the method comprises: continuous casting of molten steel is become to slab, described slab is heated successively, roughing, finish rolling, laminar flow is cooling and batch, wherein, the gross weight of described molten steel of take is benchmark, the elementary composition of described molten steel comprises: the carbon of 0.05-0.1 % by weight, silicon below 0.3 % by weight, 1.7-1.9 the manganese of % by weight, phosphorus below 0.02 % by weight, sulphur below 0.01 % by weight, the niobium of 0.01-0.03 % by weight, the iron of the titanium of 0.1-0.12 % by weight and 97.52-98.14 % by weight, the temperature of described heating is 1240-1280 ℃, and the temperature in of described finish rolling is 950-1050 ℃, and the finishing temperature of described finish rolling is 860-920 ℃, described in the temperature of batching be 580-640 ℃.
According to a third aspect of the present invention, the invention provides the hot-rolled steel sheet of being produced by aforesaid method.
According to a fourth aspect of the present invention, the invention provides the application of above-mentioned hot-rolled steel sheet in automobile bodies.
Yield strength >=the 700MPa of hot-rolled steel sheet of the present invention, and microstructure is ferrite and pearlite tissue, this can be avoided steel plate in processing, the reduction of the armor plate strength causing as the variation of microstructure in welding process, hot-rolled steel sheet of the present invention can be for Yield strength 700 MPa grade automobile bodies.In addition, in production method of the present invention, adopt titanium, alloying of manganese mode, avoided adding the noble elements such as Mo, Ni, therefore reduced the cost of hot-rolled steel sheet.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is transmission electron microscope (TEM) figure of the hot-rolled steel sheet of embodiments of the invention 1 production.
Fig. 2 is the power spectrum that Fig. 1 is corresponding (EDX) figure.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
According to a first aspect of the invention, the invention provides a kind of hot-rolled steel sheet, wherein, the gross weight of described hot-rolled steel sheet of take is benchmark, and the elementary composition of described hot-rolled steel sheet comprises: the iron of the niobium of the manganese of the carbon of 0.05-0.1 % by weight, the silicon below 0.3 % by weight, 1.7-1.9 % by weight, the phosphorus below 0.02 % by weight, the sulphur below 0.01 % by weight, 0.01-0.03 % by weight, the titanium of 0.1-0.12 % by weight and 97.52-98.14 % by weight; The microstructure of described hot-rolled steel sheet is ferritic structure and pearlitic structure.
In the present invention, no matter be in above-mentioned hot-rolled steel sheet or the molten steel for the preparation of this steel plate, except above-mentioned element, also comprise the inevitable impurity outside silica removal, p and s, because its content is very little, therefore negligible.
The thickness of hot-rolled steel sheet of the present invention can be selected according to the application conditions of hot-rolled steel sheet.Slave plate describes that the easy to control and light-weighted angle of vehicle sets out, and the thickness of described hot-rolled steel sheet is preferably 1.8-7mm, more preferably 2-6mm.
The present invention is the alloy element as hot-rolled steel sheet by niobium, titanium and manganese, plays the effect of grain refining and precipitation strength in steel.Described hot-rolled steel sheet can be by continuous casting of molten steel is become to slab, by described slab heat successively, roughing, finish rolling, laminar flow is cooling and batch and make.Under preferable case, in described hot-rolled steel sheet production process, 1240-1280 ℃, the temperature in of finish rolling is 950-1050 ℃, the finishing temperature of finish rolling is 860-920 ℃, and the temperature of batching is 580-640 ℃, and so not only making the microstructure of the hot-rolled steel sheet of formation is ferrite and pearlite tissue, can also make precipitated phase TiC disperse be distributed in ferrite matrix, thereby further improve the mechanical property of described hot-rolled steel sheet.
The microstructure of described hot-rolled steel sheet of the present invention is ferritic structure and pearlitic structure, and by precipitated phase TiC, reaches the effect of strengthening steel plate.Can avoid like this hot-rolled steel sheet in processing (as welding) process, to cause tissue to change the degradation that makes steel plate owing to introducing bainite or martensite strengthening.
In the present invention, the hot-rolled steel sheet that described hot-rolled steel sheet is a kind of Yield strength 700 MPa grade.Preferably, the yield strength of described hot-rolled steel sheet (ReL) >=700MPa, tensile strength (Rm) >=750MPa, unit elongation (A%) >=20.0%.In the present invention, the yield strength of described hot-rolled steel sheet (ReL), tensile strength (Rm) and unit elongation (A%) all detect according to the method for GB/T228.1-2010 regulation.
And the cold-bending property of described hot-rolled steel sheet of the present invention is according to GB/T232-2010 method (B=35, α=180 °, d=a; D represents that Bend diameter, a represent that sample thickness, α represent that crooked angle, B represent the width of sample) be determined as qualified.
According to a second aspect of the invention, the invention provides the production method of above-mentioned hot-rolled steel sheet, the method comprises: continuous casting of molten steel is become to slab, described slab is heated successively, roughing, finish rolling, laminar flow is cooling and batch, wherein, the gross weight of described molten steel of take is benchmark, the elementary composition of described molten steel comprises: the carbon of 0.05-0.1 % by weight, silicon below 0.3 % by weight, 1.7-1.9 the manganese of % by weight, phosphorus below 0.02 % by weight, sulphur below 0.01 % by weight, the niobium of 0.01-0.03 % by weight, the iron of the titanium of 0.1-0.12 % by weight and 97.52-98.14 % by weight, the temperature of described heating is 1240-1280 ℃, and the temperature in of described finish rolling is 950-1050 ℃, and the finishing temperature of described finish rolling is 860-920 ℃, described in the temperature of batching be 580-640 ℃.
By Axiovert MAT200 metaloscope tester, draw, the microstructure of the hot-rolled steel sheet being made by method of the present invention is ferritic structure and pearlitic structure.
Fig. 1 is the TEM figure of the hot-rolled steel sheet of embodiments of the invention 1 preparation, and Fig. 2 is that TEM schemes corresponding power spectrum (EDX) figure.In conjunction with Fig. 1 and Fig. 2, can find out, the precipitated phase TiC disperse of the hot-rolled steel sheet that the inventive method is produced is in ferrite matrix.
In the present invention, described molten steel can adopt the ordinary method of this area to make, such as making by methods such as blast furnace ironmaking, hot metal pretreatment, converter smelting, steel ladle deoxidation, alloying furnace rear refining and LF electrically heated.For the composition of the molten steel that makes to make meets above-mentioned composition requirement, in converter steelmaking process, introduce appropriate Mn and Si, in LF electrically heated process, first add Nb, then carry out introducing appropriate Ti after deoxidation, and molten steel composition is finely tuned.
In the present invention, the conventional continuous cast method that the continuous casting of described slab is this area, that is, and after described liquid steel refining, through the basket pouring of continuous caster to crystallizer, respectively through throwing, secondary is cooling and the technique such as cutting forms continuous casting steel billet.
According to the embodiment of the present invention, described molten steel is after continuous casting is processed, and the slab thickness of formation is 200-230mm.
In the present invention, described heating of plate blank can various routines for the device of heating of plate blank on carry out, for the device of heating of plate blank, can be for example walking beam furnace.The temperature of described heating of plate blank is 1240-1280 ℃, so that the abundant solid solution of Ti in described slab.
In the present invention, preferably, before roughing is processed, slab is carried out to dephosphorize by high pressure water processing, to remove the iron scale in steel slab surface.
In the present invention, in order further to make described heat prick steel plate, meet light-weighted demand, under preferable case, the passage of described roughing is 3-7, every time draught is controlled within the scope of 20-35%, described roughing can adopt the conventional roughing mill using of those skilled in the art as being with the edger roll roughing mill of AWC (width is controlled automatically) function to operate, and described slab thickness of (intermediate blank) after roughing is preferably 30-60mm.
Method according to the present invention, described slab carries out finish rolling by 4-7 frame after roughing, and the temperature in of described finish rolling is 950-1050 ℃, is preferably 970-1035 ℃; The finishing temperature of described finish rolling is 860-920 ℃, is preferably 870-920 ℃.
A preferred embodiment of the invention, it is 1.8-7mm, more preferably 2-6mm that the condition of described finish rolling makes the thickness of the steel plate of formation.
Method according to the present invention, in the cooling process of laminar flow, thereby have greatly changed and have influence on the mechanical property of hot-rolled steel sheet for fear of the content of ferrite and pearlite in described hot-rolled steel sheet or volume fraction, under preferable case, the cooling speed of cooling of described laminar flow is 10-50 ℃/s.
In the present invention, described cooling after, the temperature of slab can be 580-640 ℃, is preferably 580-625 ℃.
Method according to the present invention, batches slab afterwards described laminar flow is cooling, and the coiling temperature of described slab stops cooling temperature.
According to a third aspect of the present invention, the invention provides the hot-rolled steel sheet of being produced by aforesaid method.The microstructure of the hot-rolled steel sheet of being produced by the method for the invention is that ferrite and pearlite is organized, and the effect of strengthening steel plate is played in its precipitated phase TiC disperse in ferrite matrix.
According to a fourth aspect of the present invention, the invention provides the application of above-mentioned hot-rolled steel sheet in automobile bodies.The yield strength of the hot-rolled steel sheet that the present invention is synthetic, can be as Yield strength 700 MPa grade automobile bodies hot-rolled steel sheet more than 700MPa.
The present invention is further detailed explanation by the following examples.
Embodiment 1-5
Embodiment 1-5 is used for illustrating hot-rolled steel sheet provided by the invention and production method thereof.
Through conventional converter smelting, continuous casting, obtain continuous casting steel billet, the various compositions of slab are as shown in table 1; By the continuous casting steel billet making carry out successively respectively heating of plate blank, dephosphorize by high pressure water, roughing, finish rolling, laminar flow is cooling and batch, thereby make hot-rolled steel sheet.Wherein, it is respectively as shown in table 2 that the temperature of heating of plate blank, workpiece thickness, finish rolling enter to roll the thickness of temperature, finish rolling finishing temperature, speed of cooling, coiling temperature and gained hot-rolled steel sheet.
Comparative example 1
Through conventional converter smelting, continuous casting, obtain continuous casting steel billet, the various compositions of slab are as shown in table 1; By the continuous casting steel billet making carry out successively respectively heating of plate blank, dephosphorize by high pressure water, roughing, finish rolling, laminar flow is cooling and batch, thereby make hot-rolled steel sheet.Wherein, it is respectively as shown in table 2 that the temperature of heating of plate blank, workpiece thickness, finish rolling enter to roll the thickness of temperature, finish rolling finishing temperature, speed of cooling, coiling temperature and gained hot-rolled steel sheet.
Comparative example 2
By the slab identical with embodiment 1 carry out successively heating of plate blank, dephosphorize by high pressure water, roughing, finish rolling, laminar flow is cooling and batch, thereby make hot-rolled steel sheet.Wherein, it is respectively as shown in table 2 that the temperature of heating of plate blank, workpiece thickness, finish rolling enter to roll the thickness of temperature, finish rolling finishing temperature, speed of cooling, coiling temperature and gained hot-rolled steel sheet.
Table 1
Table 2
Performance test
On the coil of strip of the hot-rolled steel sheet making at above embodiment 1-5 and comparative example 1-2, sample, and detect yield strength (ReL), tensile strength (Rm) and unit elongation (A%) according to the method for GB/T228.1-2010 regulation, method according to GB/T232-2010 regulation detects cold-bending property (B=35, α=180 °, d=a; D represents that Bend diameter, a represent that sample thickness, α represent that crooked angle, B represent the width of sample, and detected result is shown in Table 3.
Table 3
From the data of above-mentioned table 3, can find out, adopt more than the tensile strength of the hot-rolled steel sheet that production method provided by the invention makes reaches 750MPa, more than yield strength reaches 700MPa, unit elongation reaches more than 20%, and cold-bending property is also qualified.This hot-rolled steel sheet meets the requirement that Yield strength 700 MPa grade automobile bodies is used.And the cost of alloy of this steel grade is low, there is rolling technology and control simple and adaptable feature.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a hot-rolled steel sheet, wherein, the gross weight of described hot-rolled steel sheet of take is benchmark, and the elementary composition of described hot-rolled steel sheet comprises: the iron of the niobium of the manganese of the carbon of 0.05-0.1 % by weight, the silicon below 0.3 % by weight, 1.7-1.9 % by weight, the phosphorus below 0.02 % by weight, the sulphur below 0.01 % by weight, 0.01-0.03 % by weight, the titanium of 0.1-0.12 % by weight and 97.52-98.14 % by weight; The microstructure of described hot-rolled steel sheet is ferritic structure and pearlitic structure.
2. hot-rolled steel sheet according to claim 1, wherein, the thickness of described hot-rolled steel sheet is 1.8-7mm.
3. hot-rolled steel sheet according to claim 1, wherein, in the production process of described hot-rolled steel sheet, the temperature of heating of plate blank is 1240-1280 ℃, the temperature in of finish rolling is 950-1050 ℃, and the finishing temperature of finish rolling is 860-920 ℃, and the temperature of batching is 580-640 ℃.
4. according to the hot-rolled steel sheet described in any one in claim 1-3, wherein, the yield strength >=700MPa of described hot-rolled steel sheet, tensile strength >=750MPa, unit elongation >=20.0%.
5. the production method of the hot-rolled steel sheet described in any one in claim 1-4, the method comprises: continuous casting of molten steel is become to slab, by described slab heat successively, roughing, finish rolling, laminar flow is cooling and batch, wherein, the gross weight of described molten steel of take is benchmark, and the elementary composition of described molten steel comprises: the iron of the niobium of the manganese of the carbon of 0.05-0.1 % by weight, the silicon below 0.3 % by weight, 1.7-1.9 % by weight, the phosphorus below 0.02 % by weight, the sulphur below 0.01 % by weight, 0.01-0.03 % by weight, the titanium of 0.1-0.12 % by weight and 97.52-98.14 % by weight; The temperature of described heating is 1240-1280 ℃, and the temperature in of described finish rolling is 950-1050 ℃, and the finishing temperature of described finish rolling is 860-920 ℃, described in the temperature of batching be 580-640 ℃.
6. method according to claim 5, wherein, is 200-230mm by the thickness of the slab of described continuous casting of molten steel one-tenth; The thickness of described slab after roughing is 30-60mm.
7. method according to claim 5, wherein, it is 1.8-7mm that the condition of described finish rolling makes the thickness of the hot-rolled steel sheet that forms.
8. method according to claim 5, wherein, the cooling speed of described laminar flow is 10-50 ℃/s.
9. the hot-rolled steel sheet that the method described in any one is produced in claim 5-8.
10. the application of the hot-rolled steel sheet described in any one in automobile bodies in claim 1-4 and claim 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106191408A (en) * | 2016-08-12 | 2016-12-07 | 武汉钢铁股份有限公司 | A kind of yield strength 530MPa level Thin Specs Hot Rolling Automobile chassis beam steel and production method |
| CN111618108A (en) * | 2020-06-05 | 2020-09-04 | 江苏联峰实业有限公司 | Hot rolling process of deformed steel bar |
| CN115198202A (en) * | 2022-09-19 | 2022-10-18 | 苏州创镕新材料科技有限公司 | 700 MPa-level high-strength thinning material for vehicle oil tank bracket and preparation method thereof |
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| CN101413049A (en) * | 2008-11-28 | 2009-04-22 | 首钢总公司 | Preparation of normalizing weldable fine grain steel plate with a yield strength of 420MPa |
| CN103014494A (en) * | 2011-09-21 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and manufacturing method thereof |
| CN103667906A (en) * | 2013-12-03 | 2014-03-26 | 武汉钢铁(集团)公司 | Hot-rolling high-strength steel sheet having tensile strength of 590 MPa grade and production method thereof |
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| CN101413049A (en) * | 2008-11-28 | 2009-04-22 | 首钢总公司 | Preparation of normalizing weldable fine grain steel plate with a yield strength of 420MPa |
| CN103014494A (en) * | 2011-09-21 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and manufacturing method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106191408A (en) * | 2016-08-12 | 2016-12-07 | 武汉钢铁股份有限公司 | A kind of yield strength 530MPa level Thin Specs Hot Rolling Automobile chassis beam steel and production method |
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| CN111618108A (en) * | 2020-06-05 | 2020-09-04 | 江苏联峰实业有限公司 | Hot rolling process of deformed steel bar |
| CN111618108B (en) * | 2020-06-05 | 2022-03-18 | 江苏联峰实业有限公司 | Hot rolling process of deformed steel bar |
| CN115198202A (en) * | 2022-09-19 | 2022-10-18 | 苏州创镕新材料科技有限公司 | 700 MPa-level high-strength thinning material for vehicle oil tank bracket and preparation method thereof |
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Application publication date: 20140903 |