CN103667908A - Hot-rolled high-strength sheet steel having tensile strength of 540MPa, and production method thereof - Google Patents
Hot-rolled high-strength sheet steel having tensile strength of 540MPa, and production method thereof Download PDFInfo
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Abstract
The invention discloses a hot-rolled high-strength sheet steel having a tensile strength of 540MPa, and a production method thereof. The steel comprises 0.06-0.09wt% of C, 0.10-0.30wt% of Si, 0.80-1.60wt% of Mn, 0.025wt% or less of P, 0.012wt% or less of S, 0.015-0.035wt% of Ti, 0.01-0.03wt% of Nb, 0.01-0.03wt% of Als, and the balance Fe and inevitable impurities. The production method of the sheet steel comprises the following steps: desulfurizing molten iron, carrying out converter smelting, and alloying; carrying out ladle furnace treatment, and feeding Si-Ca wires during the treatment; carrying out continuous casting and rolling; tapping off the above obtained casted blank, and carrying out high pressure water dephosphorization; carrying out seven-stage rolling; carrying out laminar cooling; reeling; pickling; flattening; and finishing. The steel has stable performances, a high dimension precision and a good elongation rate, can be used in automobile structure and safety members comprising passenger car chassis, various reinforcing plates and the like, and reduces the automobile production cost, and the production method of the steel has a low production cost and a good industrial production adaptability.
Description
Technical field
The invention belongs to automobile steel technical field, specifically refer to a kind of tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate and production method.
Background technology
Along with the development of automotive light weight technology technology, vehicle structure and safety are the direct way of automotive light weight technology with the attenuate of high-strength steel.At present, in automobile production, conventional thin specification steel plate is mainly used in the production of the parts such as automobile chassis system, body structure system, seat security system.
Produce line with traditional hot rolling and compare, the hot-rolled steel sheet that adopts CSP (CSP) method to produce has that flow process is short, intensity is high, cost is low, the thin feature of thickness specification especially, is the effective means of automotive light weight technology.Utilize CSP to produce thin plate advantage, various countries Iron and Steel Production mechanism has developed thin intensity steel plate with a high standard according to this product line feature, realizes the lightweight of material.Abroad, the flexible flexible configuration technology of the cord wood design that configures optional equipment on continuous caster and milling train of Germany western mark company exploitation, can on original CSP production line, produce all steel grades that the industry markets such as automobile, pipeline, electrician need, comprise low carbon IF steel, mild steel, middle carbon and high carbon steel, high-strength low-alloy steel, pipe line steel, stainless steel, the steel alloy such as acidproof and heat-resisting and electrical steel etc.Italy Arvedi Iron And Steel Company adopt employing continuous casting-hot continuous rolling that the hot-rolled steel sheets such as soft steel, medium carbon steel and the high carbon steel of the use such as vehicle structure that electric furnace-CSP compact production line produces, building field, household electrical appliances, oil pipeline and boron steel, weathering steel, steel alloy, dual phase steel and Hyundai motor corporation provide-fast cooling-batch automobile body-used ultrahigh-strength steel plates and production method that production technique organization of production structure is ferrite, martensite and bainite compound phase.SUMITOMO CHEMICAL metal adopts the production technique of continuous casting and rolling and Controlled Rolling And Controlled Cooling to produce automobile body-used high tensile steel plate and the production method with excellent formability and surface quality, has excellent toughness, and tensile strength reaches 100～1400kg/mm
2document and the patents such as super high strength hot rolled, cold-rolled steel sheet for automobile door frame impact beam.At home, Baogang take low C-Mn steel and as raw material, on CSP sheet billet continuous casting and rolling production line, adopts the cooling and supper-fast process for cooling of laminar flow, to develop thickness be 4～11mm, be organized as cable body+martensite, tensile strength be 590～620MPa, yield strength be 385～455MPa, for 590MPa level and the 540MPa level hot rolling biphase plate of truck structural members.The employing that Ma Gang provides is smelted, CSP CSP, cold rolling, bell-type annealing is efficient, production application is cheaply carried out stamping a kind of producing deep-drawing Low-carbon aluminium-killed based on CSP technique in automobile and other industries, a kind of punch level cold rolled steel plate production method based on CSP technical process of DQ level punching press automobile steel, adopt the explained hereafter yield strengths such as Deep Desulphurization of Hot Metal → converter top bottom blowing → external refining → continuous casting (machine is clear) → hot-loading and hot-conveying reheat → controlled rolling of entering holding pit → slab → control is cooling to reach 700MPa, there is good mechanical property and good welding, the processing characteristicies such as clod wash, production process interalloy element adds few, do not need to carry out tempering or the thermal treatment process such as modified, a kind of high-strength cold-formed hot continuous rolled steel plate and the production method thereof that comprise the use such as special car structural part.But, the high-strength steel that domestic and international advanced steel mill adopts CSP method to produce above has all been obtained certain technique effect, but they are in order to pursue the over-all properties of product made from steel, in steel, all added more alloying element, thereby cause the cost of steel to increase, and the equal higher caliper more than 2.5mm of their steel thickness of producing, the thickness of product needs further to improve.
Summary of the invention
The object of the invention is to provide a kind of tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate and production method thereof.This steel stable performance, dimensional precision be high, have good unit elongation, can be used for automobile structure and the safety members such as passenger car chassis, all kinds of stiffening plates, reduce automobile production cost, and its production method production cost is low, industrial production adaptability is good.
For achieving the above object, tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate of the present invention, its adopt take carbon and manganese solution strengthening element as main and auxiliary with titanium elements microalloying, its chemical composition is counted according to weight percent: C:0.06～0.09, Si:0.10～0.30, Mn:0.80～1.60, P≤0.025, S≤0.012, Ti:0.015～0.035, Nb:0.01～0.03, Als:0.01～0.03, surplus is Fe and inevitable impurity.
Preferably, the chemical composition of this steel is counted according to weight percent:: C:0.070～0.075, Si:0.15～0.20, Mn:1.00～1.20, P≤0.025, S≤0.012, Ti:0.025～0.030, Nb:0.02～0.03, Als:0.02～0.025, surplus is Fe and inevitable impurity.
The production method of described tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate, comprises the following steps successively:
1) desulfurizing iron, converter smelting Alloying Treatment;
2) carry out ladle furnace processing, during processing, feed silicon-calcium wire;
3) carry out continuous casting and rolling, during rolling, slab thickness is controlled at below 54mm, and after continuous casting, strand directly heats, and heating furnace temperature is 1050～1100 ℃, and in stove, soaking time is 30～90min;
4) strand is come out of the stove and is carried out dephosphorize by high pressure water;
5) carry out seven passage rollings, during described rolling, FT1～FT7 passage is depressed partition ratio and is followed successively by: (50～60%): (20～30%): 0%:(5～10%): (3～7%): (2～5%): (2～5%), and it is 780～830 ℃ that finishing temperature is controlled;
6) carry out laminar flow cooling, the cooling employing back segment of described laminar flow Cooling Mode, air cooling 6～9s after finish to gauge, then carries out cooling with 35～45 ℃/s;
7) batch, described coiling temperature is 450～590 ℃.
8) pickling;
9) smooth;
10) carry out finishing, during described finishing, adopt Electrostatic greasing, be coated with oil mass>=1.5g/mm
2.
Preferably, described step 2), in 0.4～0.6kg/t steel ratio, feed silicon-calcium wire.
Further, in described step 4), the pressure >=250bar of dephosphorization water.
Again further, in described step 9), control smooth unit elongation≤2%.
The principle analysis that in High Tensile Thin Steel Plate of the present invention, the selection of each component and preparation technology parameter thereof limit is as follows:
Carbon: carbon is cheap solution strengthening element.For C content there is risk near the production of steel grade peritectoid district to CSP technique, if C content surpasses 0.20%, press formability and welding property can reduce; The present invention is limited to its content 0.06～0.09% scope, is preferably 0.070～0.075% scope, and adopts the C composition system lower than peritectoid district, and cooperated technique for producing, reaches intensity targets.
Silicon: silicon is cheap and effective steel liquid deoxidation element.In order to maintain strength of parent, to carry out pre-deoxidation and add, if its content is less than 0.10%, can not bring into play its effect, if content surpasses 0.30%, can have a strong impact on rolling de-scaling and pickling rear surface quality, so, its content is limited to below 0.30%, be preferably and be controlled at below 0.20%.
Manganese: manganese is to improve intensity and the most effective element of toughness, can improve the intensity of steel and extend balance, for guaranteeing target strength and extension property, its weight ratio content is limited to 0.80～1.60%, is preferably 1.00～1.20% scopes.
Phosphorus: phosphorus is the harmful element in steel, easily causes center segregation of casting blank, worsens for fear of cold bending performance, toughness, sets on its weight content and is limited to 0.025%.
Sulphur: sulphur is the element being harmful to very much.Sulphur in steel often exists with the oxide morphology of manganese, and this sulfide inclusion is very disadvantageous to the impelling strength of steel, and causes the anisotropy of performance, therefore, sulphur content in steel need be controlled more low better.Consideration based on to steel plate cold bending forming technology and production cost, plans the content of sulphur in steel and is controlled at below 0.012%.
Titanium: can crystal grain thinning and improve the strength and toughness of steel, steel is carried out to micro-titanium processing, can change the pattern of sulfide, significantly promote steel plate cold bending performance.When it contains quantity not sufficient 0.020%, can not give full play to its effect; On the other hand, when the titanium adding is greater than 0.040%, can cause toughness to worsen owing to generating superfluous titanium carbide, extension property declines, and affects material property.So stipulate to be limited to 0.040% on it.So, its content is limited to 0.015～0.035%, be preferably 0.025～0.030% scope.
Niobium: the fine Nb (C, N) that rolling deformation induction is separated out austenite recrystallization, both can realize non-recrystallization controlled rolling, the mixed crystal phenomenon that can avoid again soft steel easily to occur except suppressing.Content of niobium total in steel does not have a direct impact it, so the present invention is limited to 0.01～0.03% scope by its content, is preferably 0.02～0.03%.In addition, the controlled rolling key adding after niobium is to avoid separating out thick Nb (C, N) before rolling, reduces invalid niobium and causes waste.
Aluminium: aluminium adds for deoxidation, when the weight percentage less than 0.01% of Als, can not bring into play its effect; On the other hand, owing to adding the aluminium of volume, easily form aluminum oxide agglomerate, therefore, Als content is limited to 0.01～0.03%, is preferably 0.02～0.025% scope.
Production method of the present invention adopts CSP to produce line and produces, and after continuous casting, strand directly heats, Control for Kiln Temperature 1050～1100 ℃ of ultralow scopes and in stove soaking time 30～90min, during finishing, strict FT1～FT7 passage of controlling is depressed partition ratio, and the extremely low finishing temperature of control is 780～830 ℃ of scopes, like this, through seven passage rollings, make austenite crystal constantly obtain refinement, the cooling employing back segment of laminar flow Cooling Mode, after finish to gauge, air cooling makes to roll rear ferrite and separates out and grow up, control ferrite content simultaneously, then with 35～45 ℃/s, carry out cooling, bainite is separated out fast, laminar flow is cooling except affecting transformation temperature and ferrite grain size, also affect the austenite grain size before phase transformation, and then ferrite grain size and ratio in the final tissue of impact, also can control the degree of precipitation strength and produce slight dislocations strengthening simultaneously, because coiling temperature directly affects the performance of steel, the too high meeting of coiling temperature makes to separate out perlite in tissue, reduces the Extending flange Perfor of material, the too low meeting of curling temperature causes occurring intensity obviously being increased martensite in tissue, and plastic deformation ability reduces, and it is 450～590 ℃ of scopes that the present invention controls described coiling temperature.
Therefore, tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate of the present invention is for the lightweight demand of automobile steel, employing be take carbon and manganese solution strengthening element as main, the particular components that is aided with trace amount of titanium element microalloying, use titanium micro-alloyedization precipitate to suppress the characteristic of austenite recrystallization, and the advantage of utilizing CSP to produce line production latten is produced, strict control low-temperature heat in production process, low temperature finish to gauge, the control techniquess such as suitable speed of cooling and high precision rolling, realized the application upgrade of low cost production and the ultra-thin specification of product, the product made from steel thickness of producing is below 2.5mm, tensile strength >=540MPa, there is intensity high, thin thickness, the feature that high Extending flange Perfor and surface quality are good, alternative cold-reduced sheet is for the production of automobile structure, reduce automobile production cost.
Accompanying drawing explanation
Accompanying drawing 1 is the metallographic structure figure of tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate of the present invention and production method thereof are described in further detail.
The chemical component weight percentage ratio of various embodiments of the present invention tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate (surplus is Fe and inevitable impurity) is as shown in table 1:
The chemical composition (wt%) of each case study on implementation of table 1 the present invention
| Embodiment | C | Si | Mn | P | S | Ti | Nb | Als |
| 1 | 0.065 | 0.13 | 1.13 | 0.014 | 0.006 | 0.033 | 0.017 | 0.030 |
| 2 | 0.071 | 0.15 | 1.15 | 0.013 | 0.005 | 0.030 | 0.020 | 0.026 |
| 3 | 0.072 | 0.23 | 1.18 | 0.015 | 0.007 | 0.031 | 0.022 | 0.021 |
| 4 | 0.068 | 0.16 | 1.20 | 0.013 | 0.008 | 0.027 | 0.019 | 0.027 |
| 5 | 0.075 | 0.20 | 1.19 | 0.012 | 0.006 | 0.029 | 0.018 | 0.029 |
The production method of the various embodiments described above steel is carried out successively according to following steps:
1) desulfurizing iron, converter smelting Alloying Treatment;
2) carry out ladle furnace processing, and according to 0.4～0.6kg/t steel feeding silicon-calcium wire;
3) carry out continuous casting and rolling, during rolling, slab thickness is no more than 54mm, and after continuous casting, red heat strand directly enters process furnace and heats, and very low temperature is controlled furnace temperature at 1050～1100 ℃, and in stove, soaking time is 30～90min;
4) strand is come out of the stove and is carried out dephosphorize by high pressure water, and for guaranteeing pickling rear surface quality, dephosphorization pressure is 250～300bar;
5) carry out controlled rolling, during rolling, finishing FT1～FT7 passage is depressed partition ratio and is: (50～60%): (20～30%): 0%:(5～10%): (3～7%): (2～5%): (2～5%), 780～830 ℃ of very low temperature finishing temperatures;
6) carry out the cooling employing back segment of laminar flow Cooling Mode, air cooling 6～9s after finish to gauge, then carries out coolingly with 35～45 ℃/s, bainite is separated out fast;
7) batch, control coiling temperature at 450～590 ℃;
8) adopt turbulent mode to carry out pickling;
9) carry out smoothly, control smooth unit elongation and be no more than 2%;
10) carry out finishing, adopt Electrostatic greasing, be coated with oil mass and be no less than 1.5g/mm
2.
Concrete technology parameter is as shown in table 2 in process of production for each embodiment steel.
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
Then the over-all properties of the various embodiments described above product made from steel is detected, detected result is as shown in table 3.
The mechanical property detected result of each case study on implementation of table 3 the present invention
Above-described embodiment 1 product made from steel metallographic structure figure as shown in Figure 1.As can be seen from Figure 1: the tissue of material is comprised of ferrite+perlite, ferritic grain fineness number is tiny evenly, corresponding average grain size is below 6 microns, more tiny than conventional grain-size, this tiny crystalline substance essence size can play strengthening effect, or the loss of strength after making up alloying element content and reducing.
From the detected result of table 3, can find out, steel principal character of the present invention is thin specification, high strength, unit elongation is higher, more than actual tensile strength reaches 540MPa, there is good Strength Safety and plastic making over-all properties, can replace the High Strength Steel Plate that thickness is larger, for the structures such as automobile chassis, reinforcement and the production of the part of safety.
Claims (7)
1. a tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate, it is characterized in that, the chemical composition of this steel is counted according to weight percent: C:0.06～0.09, Si:0.10～0.30, Mn:0.80～1.60, P≤0.025, S≤0.012, Ti:0.015～0.035, Nb:0.01～0.03, Als:0.01～0.03, surplus is Fe and inevitable impurity.
2. tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate according to claim 1, it is characterized in that, the chemical composition of this steel is counted according to weight percent: C:0.070～0.075, Si:0.15～0.20, Mn:1.00～1.20, P≤0.025, S≤0.012, Ti:0.025～0.030, Nb:0.02～0.03, Als:0.02～0.025, surplus is Fe and inevitable impurity.
3. a production method for tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate described in claim 1, comprises the following steps successively:
1) desulfurizing iron, converter smelting Alloying Treatment;
2) carry out ladle furnace processing, during processing, feed silicon-calcium wire;
3) carry out continuous casting and rolling, during rolling, slab thickness is controlled at below 54mm, and after continuous casting, strand directly heats, and heating furnace temperature is 1050～1100 ℃, is incubated 30～90min in stove;
4) strand is come out of the stove and is carried out dephosphorize by high pressure water;
5) carry out seven passage rollings, during described rolling, FT1～FT7 passage is depressed partition ratio and is followed successively by: (50～60%): (20～30%): 0%:(5～10%): (3～7%): (2～5%): (2～5%), and it is 780～830 ℃ that finishing temperature is controlled;
6) carry out laminar flow cooling, the cooling employing back segment of described laminar flow Cooling Mode, air cooling 6～9s after finish to gauge, then carries out cooling with 35～45 ℃/s;
7) batch, described coiling temperature is 450～590 ℃;
8) pickling;
9) smooth;
10) carry out finishing, during described finishing, adopt Electrostatic greasing, be coated with oil mass>=1.5g/mm
2.
4. the production method of tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate according to claim 3, is characterized in that: described step 2), in 0.4～0.6kg/t steel ratio feeding silicon-calcium wire.
5. according to the production method of tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate described in claim 3 or 4, it is characterized in that: in described step 4), the pressure >=250bar of dephosphorization water.
6. according to the production method of tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate described in claim 3 or 4, it is characterized in that: in described step 9), control smooth unit elongation≤2%.
7. the production method of tensile strength 540MPa level hot rolling High Tensile Thin Steel Plate according to claim 5, is characterized in that: in described step 9), control smooth unit elongation≤2%.
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| CN104372242A (en) * | 2014-10-10 | 2015-02-25 | 河北钢铁股份有限公司邯郸分公司 | 470MPa grade cold rolled strip steel and production method thereof |
| CN106086683A (en) * | 2016-08-24 | 2016-11-09 | 武汉钢铁股份有限公司 | By tensile strength >=1700MPa thin hot forming steel and the production method of sheet billet Direct Rolling |
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| CN109536847B (en) * | 2017-09-21 | 2020-12-08 | 上海梅山钢铁股份有限公司 | Hot rolled steel plate for welded pipe with yield strength of 390MPa and manufacturing method thereof |
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| CN109023111A (en) * | 2018-09-26 | 2018-12-18 | 武汉钢铁有限公司 | A kind of 1000MPa grades of hot rolling automotive frame steel and its manufacturing method |
| CN109023111B (en) * | 2018-09-26 | 2020-04-07 | 武汉钢铁有限公司 | 1000 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof |
| CN109609729B (en) * | 2018-11-06 | 2020-05-29 | 鞍钢股份有限公司 | Stainless steel plate with 650 MPa-grade yield strength and manufacturing method thereof |
| CN109609729A (en) * | 2018-11-06 | 2019-04-12 | 鞍钢股份有限公司 | Stainless steel plate with 650 MPa-grade yield strength and manufacturing method thereof |
| CN111961968A (en) * | 2020-07-31 | 2020-11-20 | 安徽工业大学 | Vanadium-titanium microalloyed engineering structural steel and preparation method thereof |
| CN115852249A (en) * | 2022-09-30 | 2023-03-28 | 武汉钢铁有限公司 | 980 MPa-grade hot-rolled DH steel plate and method for producing same by using thin slab |
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