CN103667906B - Tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate and production method thereof - Google Patents
Tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a kind of tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate and production method thereof.The chemical composition of this steel counts C:0.06 ~ 0.09, Si:0.10 ~ 0.30, Mn:1.00 ~ 1.70, P≤0.020, S≤0.012, Ti:0.015 ~ 0.035, Nb:0.01 ~ 0.04, Als:0.01 ~ 0.04 according to weight percent, and surplus is Fe and inevitable impurity.Its preparation method comprises the following steps successively: desulfurizing iron, converter smelting Alloying Treatment; Ladle furnace process, feeds silicon-calcium wire during process; Continuous casting and rolling; Strand is come out of the stove dephosphorize by high pressure water; Seven passes; Section cooling; Batch; Pickling; Smooth; Finishing.Steel Properties of the present invention is stable, dimensional precision is high, unit elongation is good, can be used for the automobile structure such as chassis, stiffening plate and safety member, reduces production cost.
Description
Technical field
The invention belongs to automobile steel technical field, specifically refer to a kind of tensile strength 590MPa 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 high-strength steel thinning is the most direct way of automotive light weight technology.At present, conventional in automobile production thin specification steel plate is mainly used in the production of the parts such as automobile chassis system, body structure system, seat security system.
Compared with producing line with traditional hot rolling, the hot-rolled steel sheet adopting CSP (CSP) method to produce has the advantages that flow process is short, intensity is high, cost is low, especially thickness specification is thin, is the effective means of automotive light weight technology.Utilize CSP to produce thin plate advantage, Iron and Steel Production mechanism of various countries have developed Thin Specs high tensile steel plate according to this product line feature, realizes the lightweight of material.Abroad, the flexible flexible configuration technology that continuous caster and milling train configure the building block design of optional equipment of western mark company of Germany exploitation, all steel grades that the industry market such as automobile, pipeline, electrician needs can be produced on original CSP production line, comprise low carbon IF steel, mild steel, middle carbon and high carbon steel, high-strength low-alloy steel, pipe line steel, stainless steel, steel alloy and the electrical steel etc. such as acidproof and heat-resisting.Employing continuous casting-hot continuous rolling that Arvedi Iron And Steel Company of Italy adopts the soft steel of the vehicle structure, building field, household electrical appliances, oil pipeline etc. of electric furnace-CSP compact production line production, medium carbon steel and the hot-rolled steel sheet such as high carbon steel and boron steel, weathering steel, steel alloy, dual phase steel and Hyundai motor corporation to provide-cool-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 fast.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, and have excellent toughness, tensile strength reaches 100 ~ 1400kg/mm
2automobile door frame impact beam document and the patents such as super high strength hot rolled, cold-rolled steel sheet.At home, Baogang is raw material with low C-Mn steel, on CSP sheet billet continuous casting and rolling production line, adopts section cooling and ultra-rapid cooling technique, develop thickness be 4 ~ 11mm, be organized as cable body+martensite, tensile strength is 590 ~ 620MPa, yield strength is 385 ~ 455MPa, for the 590MPa level of truck structural members and 590MPa level hot rolling biphase plate.The employing that Ma Gang provides is smelted, CSP CSP, cold rolling, bell-type annealing is efficient, the production application of low cost carries 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 Deep Desulphurization of Hot Metal → converter top bottom blowing → external refining → continuous casting (machine is clear) → hot-loading and hot-conveying enter holding pit → slab and reheat → the explained hereafter yield strength such as controlled rolling → controlled cooling model reaches 700MPa, there is excellent 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, comprise a kind of high-strength cold-formed hot continuous rolled steel plate and the production method thereof of special car structural part etc.But, the high-strength steel that domestic and international advanced steel mill adopts CSP method to produce above all achieves certain technique effect, but they are in order to pursue the over-all properties of product made from steel, more alloying element is all with the addition of in steel, thus the cost of steel is caused to increase, and the steel thickness that they are produced is all in the higher caliper of more than 3.0mm, the thickness of product needs to improve further.
Summary of the invention
The object of the invention is to provide a kind of tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate and production method thereof.This Steel Properties is stable, dimensional precision is 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 590MPa level hot rolling High Tensile Thin Steel Plate of the present invention, it adopts with carbon and manganese solution strengthening element is 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:1.00 ~ 1.70, P≤0.020, S≤0.012, Ti:0.015 ~ 0.035, Nb:0.01 ~ 0.04, Als:0.01 ~ 0.04, and 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:1.40 ~ 1.50, P≤0.020, S≤0.012, Ti:0.025 ~ 0.030, Nb:0.02 ~ 0.03, Als:0.02 ~ 0.035, and surplus is Fe and inevitable impurity.
The production method of described tensile strength 590MPa 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 process, during process, feed silicon-calcium wire;
3) carry out continuous casting and rolling, during rolling, slab thickness controls at below 54mm, and after continuous casting, strand directly heats, and heating furnace temperature is 1050 ~ 1100 DEG C, is 30 ~ 90min in the stove inside holding time;
4) strand is come out of the stove and is carried out dephosphorize by high pressure water;
5) seven passes are carried out, during described rolling, FT1 ~ FT7 passage pressure partition ratio is followed successively by: (50 ~ 60%): (20 ~ 30%): 0%:(5 ~ 10%): (3 ~ 7%): (2 ~ 5%): (2 ~ 5%), finishing temperature control is 780 ~ 830 DEG C;
6) carry out section cooling, described section cooling adopts back segment Cooling Mode, and air cooling 6 ~ 9s after finish to gauge, then cools with 40 ~ 50 DEG C/s;
7) batch, described coiling temperature is 450 ~ 580 DEG C.
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 feeding 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 processing parameter thereof limit is as follows:
Carbon: carbon is cheap solution strengthening element.CSP technique is produced for the steel grade of C content near peritectoid district exists risk, if C content is more than 0.20%, then press formability and welding property can reduce; Its content is limited to the scope of 0.06 ~ 0.09% by the present invention, is preferably 0.070 ~ 0.075% scope, and adopts the C component 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, carry out pre-deoxidation and add, if its content is less than 0.10%, then can not play its effect, if content is more than 0.30%, then can have a strong impact on rolling de-scaling and pickling rear surface quality, so, its content is limited to less than 0.30%, preferably controls below 0.20%.
Manganese: manganese improves intensity and the most effective element of toughness, can improve the intensity of steel and extend balance, for ensureing target strength and extension property, its weight ratio content being limited to 1.00 ~ 1.70%, being preferably 1.40 ~ 1.50% scopes.
Phosphorus: phosphorus is the harmful element in steel, easily causes center segregation of casting blank, in order to avoid cold bending performance, toughness worsen, setting its weight content upper limit is 0.020%.
Sulphur: sulphur is the element be harmful to very much.Sulphur in steel often exists with the oxide morphology of manganese, and the impelling strength of this sulfide inclusion to steel is very disadvantageous, and causes the anisotropy of performance, therefore, sulphur content in steel need be controlled more low better.Based on the consideration to steel plate cold bending forming technology and production cost, plan the content of sulphur in steel and control below 0.012%.
Titanium: can crystal grain thinning and improve the strength and toughness of steel, carries out Trace Titanium Treatment to steel, can change the pattern of sulfide, significantly promote steel plate cold bending performance.When it is containing quantity not sufficient 0.020%, its effect can not be given full play to; On the other hand, when the titanium added is greater than 0.040%, then can cause toughness deteriorate owing to generating superfluous titanium carbide, extension property declines, and affects material property.So specify that its upper limit is 0.040%.So, its content is limited to 0.015 ~ 0.035%, is preferably 0.025 ~ 0.030% scope.
Niobium: the fine Nb (C, N) that rolling deformation induction is separated out, except suppressing austenite recrystallization, both can realize non-recrystallization controlled rolling, and can avoid again the mixed crystal phenomenon that soft steel easily occurs.Content of niobium total in steel does not then have a direct impact it, so its content is limited to 0.01 ~ 0.04% by the present invention, is preferably 0.02 ~ 0.03% scope.In addition, adding the key of the controlled rolling after niobium is separate out thick Nb (C, N) before avoiding rolling, reduces invalid niobium and causes waste.
Aluminium: aluminium adds in order to deoxidation, when the weight percentage of Als is less than 0.01%, can not play its effect; On the other hand, because the aluminium adding volume easily forms aluminum oxide agglomerate, therefore, Als content is limited to 0.01 ~ 0.04%, is preferably 0.02 ~ 0.035% scope.
Production method of the present invention adopts CSP to produce line and produces, and after continuous casting, strand directly heats, and Control for Kiln Temperature is 1050 ~ 1100 DEG C of ultralow scopes and at stove inside holding time 30 ~ 90min, during finishing, strictly control FT1 ~ FT7 passage depresses partition ratio, and the extremely low finishing temperature of control is 780 ~ 830 DEG C of scopes, like this, austenite crystal is made constantly to obtain refinement through seven passes, section cooling adopts back segment Cooling Mode, after finish to gauge, air cooling makes to roll rear ferrite and separates out and grow up, control ferrite content simultaneously, then cool with 40 ~ 50 DEG C/s, bainite is separated out fast, section cooling is except affecting transformation temperature and ferrite grain size, also affect the austenite grain size before phase transformation, and then affect ferrite grain size and ratio in final tissue, 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 coiling temperature causes occurring martensite in tissue, and intensity is obviously increased, and plastic deformation ability reduces, and it is 450 ~ 580 DEG C of scopes that the present invention controls described coiling temperature.
Therefore, tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate of the present invention is for the lightweight demand of automobile steel, adopt based on carbon and manganese solution strengthening element, be aided with the particular components of trace amount of titanium element microalloying, titanium microalloying precipitate is used to suppress the characteristic of austenite recrystallization, and the advantage utilizing CSP to produce line production latten is produced, strictly low-temperature heat is controlled in production process, low temperature finish to gauge, the control techniquess such as suitable speed of cooling and high precision rolling, achieve the low cost production of product and the application upgrade of ultra-thin specification, the product made from steel thickness produced is at below 3.0mm, tensile strength >=590MPa, there is intensity high, thickness is thin, high Extending flange Perfor and the good feature of surface quality, alternative cold-reduced sheet is used for the production of automobile structure, reduce automobile production cost.
Accompanying drawing explanation
Accompanying drawing 1 is the metallographic structure figure of tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, tensile strength 590MPa 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 (surplus is Fe and inevitable impurity) of various embodiments of the present invention tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate is as shown in table 1:
The chemical composition (wt%) of each case study on implementation of table 1 the present invention
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) ladle furnace process is carried out, 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 controls furnace temperature at 1050 ~ 1100 DEG C, is 30 ~ 90min in the stove inside holding time;
4) strand is come out of the stove and is carried out dephosphorize by high pressure water, and for ensureing pickling rear surface quality, dephosphorization pressure is 250 ~ 300bar;
5) controlled rolling is carried out, during rolling, finishing FT1 ~ FT7 passage pressure partition ratio is: (50 ~ 60%): (20 ~ 30%): 0%:(5 ~ 10%): (3 ~ 7%): (2 ~ 5%): (2 ~ 5%), very low temperature finishing temperature 780 ~ 830 DEG C;
6) carry out section cooling and adopt back segment Cooling Mode, air cooling 6 ~ 9s after finish to gauge, then cools with 40 ~ 50 DEG C/s, and bainite is separated out fast;
7) batch, control coiling temperature at 450 ~ 580 DEG C;
8) turbulent mode is adopted to carry out pickling;
9) carry out smooth, 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 of table 2 various embodiments of the present invention and comparative example
Then detect the over-all properties of the various embodiments described above product made from steel, detected result is as shown in table 3.
The mechanics properties testing 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: materials microstructure is made up of ferrite+perlite, ferritic grain fineness number fine uniform, corresponding average grain size is below 4 microns, more tiny than conventional grain-size, this tiny crystalline substance essence size can play strengthening effect, or makes up the loss of strength after alloying element content reduction.
As can be seen from the detected result of table 3, steel principal character of the present invention is Thin Specs, high strength, unit elongation is higher, actual tensile strength reaches more than 590MPa, there is good Strength Safety and plastic making over-all properties, the High Strength Steel Plate that thickness is larger can be replaced, for the structure such as automobile chassis, reinforcement and the production of part of safety.
Claims (5)
1. a tensile strength 590MPa 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:0.070 ~ 0.075, Si:0.15 ~ 0.20, Mn:1.40 ~ 1.50, P≤0.020, S≤0.012, Ti:0.025 ~ 0.030, Nb:0.02 ~ 0.03, Als:0.02 ~ 0.035, surplus is Fe and inevitable its production method of impurity, comprises the following steps successively:
1) desulfurizing iron, converter smelting Alloying Treatment;
2) carry out ladle furnace process, during process, feed silicon-calcium wire;
3) carry out continuous casting and rolling, during rolling, slab thickness controls at below 54mm, and after continuous casting, strand directly heats, and heating furnace temperature is 1050 ~ 1100 DEG C, at stove inside holding 30 ~ 90min;
4) strand is come out of the stove and is carried out dephosphorize by high pressure water;
5) seven passes are carried out, during described rolling, FT1 ~ FT7 passage pressure partition ratio is followed successively by: (50 ~ 60%): (20 ~ 30%): 0%:(5 ~ 10%): (3 ~ 7%): (2 ~ 5%): (2 ~ 5%), finishing temperature control is 780 ~ 830 DEG C;
6) carry out section cooling, described section cooling adopts back segment Cooling Mode, and air cooling 6 ~ 9s after finish to gauge, then cools with 40 ~ 50 DEG C/s;
7) batch, described coiling temperature is 450 ~ 580 DEG C;
8) pickling;
9) smooth;
10) carry out finishing, during described finishing, adopt Electrostatic greasing, be coated with oil mass>=1.5g/mm
2.
2. tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate according to claim 1, is characterized in that: described step 2) in, in 0.4 ~ 0.6kg/t steel ratio feeding silicon-calcium wire.
3. tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate according to claim 1 or 2, is characterized in that: described step 4) in, the pressure >=250bar of dephosphorization water.
4. tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate according to claim 1 or 2, is characterized in that: described step 9) in, control smooth unit elongation≤2%.
5. the production method of tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate according to claim 3, is characterized in that: described step 9) in, control smooth unit elongation≤2%.
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| CN104018078A (en) * | 2014-06-18 | 2014-09-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel plate and production method thereof |
| CN104745786B (en) * | 2015-04-14 | 2017-03-29 | 武汉钢铁(集团)公司 | A kind of method that use CSP line for exempting from spheroidizing produces Thin Specs tool steel |
| CN104805358B (en) * | 2015-05-13 | 2016-09-28 | 东北大学 | A kind of tensile strength 550MPa level beam steel and preparation method thereof |
| CN107557673B (en) * | 2016-06-30 | 2019-03-22 | 鞍钢股份有限公司 | A kind of high-strength hot rolling acid-cleaning steel plate of high-elongation and its manufacturing method |
| CN106011646B (en) * | 2016-07-15 | 2018-06-26 | 武汉钢铁有限公司 | Tensile strength is 590MPa grades of great surface quality automobile hot rolling acid-cleaning steel and production method |
| CN107653419B (en) * | 2017-09-21 | 2019-07-02 | 攀钢集团研究院有限公司 | A kind of 590MPa grades of steel plates of Nb-Ti microalloying and preparation method thereof |
| CN108796373B (en) * | 2018-06-25 | 2020-04-07 | 武汉钢铁有限公司 | Steel for generator excitation element produced by CSP process and manufacturing method thereof |
| CN110846565A (en) * | 2019-09-30 | 2020-02-28 | 邯郸钢铁集团有限责任公司 | Low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance and production method thereof |
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| CN101701316A (en) * | 2009-11-06 | 2010-05-05 | 武汉钢铁(集团)公司 | Automobile beam steel with tensile strength of 590MPa and manufacturing method thereof |
| CN102787273A (en) * | 2012-08-21 | 2012-11-21 | 武汉钢铁(集团)公司 | Sheet-billet produced hot-rolled pickled steel with thickness of 1.8mm or lower for automobile and production method thereof |
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| CN101701316A (en) * | 2009-11-06 | 2010-05-05 | 武汉钢铁(集团)公司 | Automobile beam steel with tensile strength of 590MPa and manufacturing method thereof |
| CN102787273A (en) * | 2012-08-21 | 2012-11-21 | 武汉钢铁(集团)公司 | Sheet-billet produced hot-rolled pickled steel with thickness of 1.8mm or lower for automobile and production method thereof |
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Effective date of registration: 20170718 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Hubei, Wuhan, Wuchang Friendship Road, No. 999, block A, floor 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |