CN103469079B - Tensile strength 490MPa level has Ferrite bainitic steel and the production method thereof of high reaming performance - Google Patents
Tensile strength 490MPa level has Ferrite bainitic steel and the production method thereof of high reaming performance Download PDFInfo
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Abstract
The invention discloses Ferrite bainitic steel and production method thereof that a kind of tensile strength 490MPa level has high reaming performance.The chemical composition percentage of this steel is: C:0.10 ~ 0.15%, Si:0.10 ~ 0.50%, Mn:0.50 ~ 1.0%, P:0.03 ~ 0.05%, S≤0.008%, Cr:0.20 ~ 0.60%, Al:0.01 ~ 0.06%, surplus is Fe and inevitable impurity.Its production method comprises converter smelting, vacuum-treat, continuous casting, strand heating, roughing, finish rolling, the step that cools, batch.Facts have proved, the reaming flange performance of this steel, stamping formabilily and welding property are excellent, can be applicable to the structural part such as automotive wheel, chassis, and meanwhile, its production method technical process is simple, with low cost.
Description
Technical field
The present invention relates to automobile steel technical field, refer to that a kind of tensile strength 490MPa level has Ferrite bainitic steel and the production method thereof of high reaming performance particularly.
Background technology
Along with the fast development of automotive industry, the impact of motor vehicle emission environmental pollution becomes increasingly conspicuous, and energy-saving and emission-reduction are very urgent, and automotive light weight technology is the effective means of automotive energy-saving emission-reducing.Wheel is as the parts of high speed rotating, and its lightweight is energy-conservation is about 1.5 times of other component, and effect is particularly remarkable.The parts such as automotive wheel, chassis due to the shaping of its complexity, flange, reaming operation and require material have high become performance, high flange performance.Current domestic passenger car steel wheel, chassis structure part mainly use low-alloy high-strength steel, wherein wheel spoke part part uses ferrite/martensite dual phase steel (DP steel), reaming performance due to low-alloy high-strength steel and DP steel in actual production is lower, therefore in reaming overturning process, often there is cracking, affect production efficiency and lumber recovery, and, if wheel exists undiscovered fine cracks, serious potential safety hazard can be caused to vehicle traveling.
Compared with traditional material low-alloy high-strength steel, DP steel, hot-rolled ferrite-bainite steel (FB steel) has high strength and good cold formability, good reaming, welding and fatigue property, is the ideal material of the parts hot-rolled high-strength steel plate such as automotive wheel and chassis structure part.
Summary of the invention
Object of the present invention is exactly the Ferrite bainitic steel and production method thereof that a kind of tensile strength 490MPa level will be provided to have high reaming performance, the reaming flange performance of this steel, stamping formabilily and welding property are excellent, the structural part such as automotive wheel, chassis can be applicable to, simultaneously, its production method technical process is simple, with low cost.
Realize above-mentioned purpose, tensile strength 490MPa level of the present invention has the Ferrite bainitic steel of high reaming performance, and its chemical composition percentage is:
C:0.10 ~ 0.15%, Si:0.10 ~ 0.50%, Mn:0.50 ~ 1.0%, P:0.03 ~ 0.05%, S≤0.008%, Cr:0.20 ~ 0.60%, Al:0.01 ~ 0.06%, surplus is Fe and inevitable impurity.
Further, its chemical composition percentage is: C:0.12 ~ 0.13%, Si:0.35 ~ 0.47%, Mn:0.60 ~ 0.82%, P:0.03 ~ 0.05%, S≤0.004%, Cr:0.30 ~ 0.48%, Al:0.03 ~ 0.041%, surplus is Fe and inevitable impurity.
Again further, its metallographic structure is polygonal ferrite and bainite, and wherein, ferritic volume content is 70 ~ 85%, and the volume content of bainite is 15 ~ 30%.
Tensile strength 490MPa level of the present invention has the production method of the Ferrite bainitic steel of high reaming performance, undertaken by usual Clean Steel technique, comprise converter smelting, vacuum-treat, continuous casting, strand heating, roughing, finish rolling, the step that cools, batch, its special character is:
During described converter smelting, tapping temperature is 1680 ~ 1690 DEG C; Described vacuum processing time is 12 ~ 16min; During described continuous casting, control casting speed is 0.9 ~ 1.2m/min; During described strand heating, be heated to 1230 ~ 1280 DEG C, insulation 60 ~ 90min; During described roughing, control its end temp at 1050 ~ 1090 DEG C, control draft >=75%; During described finish rolling, control its finishing temperature at 800 ~ 840 DEG C, total reduction >=75%; Described when batching, oiler temperature control is at 420 ~ 500 DEG C.
Further, described process for cooling is: leading portion air cooling, cooling rate 3 ~ 8 DEG C/s, and air cooling time is 5 ~ 10s; Back segment section cooling, speed of cooling controls at 60 ~ 100 DEG C/s,
Further, during described finish rolling, 7 frames are adopted to carry out finish rolling.
Further, the draft of described roughing controls as >=85%; The draft of described finish rolling controls as >=85%.
Tensile strength 490MPa level of the present invention has the mechanism of each constituent content control in the Ferrite bainitic steel of high reaming performance and acts on as follows:
Carbon is the most cheap solution strengthening element, affects volume fraction and the carbon content of bainite in FB steel, thus has material impact to the intensity of FB steel.If its content is less than 0.10%, then can not meet the requirement of the strength of materials, if along with the raising of carbon content, then press formability and weldability can reduce, therefore under the prerequisite of proof strength, comparatively low carbon content is adopted, so, its content is limited to 0.10 ~ 0.15% scope, is preferably 0.12 ~ 0.13%.
Silicon can improve steel strength by solution strengthening, also can suppress the precipitation of carbide, avoids the appearance of perlite phase.If its content is less than 0.10%, then can not play its effect; If its content is more than 0.50%, then can worsen surface quality and the welding property of hot-rolled steel sheet, so, its content is limited to 0.10 ~ 0.50% scope, is preferably 0.35 ~ 0.47%.
Manganese is effective solution strengthening and promotes bainite generting element, in order to play its effect, must add more than 0.5%.But add the manganese of volume, the plasticity of steel can be caused to decline, therefore under the prerequisite of proof strength, reduce the addition of Mn, so Mn content is limited to 0.5 ~ 1.0% scope, be preferably 0.60 ~ 0.82%.
Phosphorus is good solution strengthening element, the hardening capacity of steel can be improved, be conducive to obtaining the thinner Bainite Phases of Some of lamella, if content can not play effect below 0.03%, but P addition higher than 0.05% time, easily because segregation seriously causes stamping formabilily, toughness, suitability for secondary processing to worsen, therefore, P content is limited to 0.03 ~ 0.05% scope.
Sulphur is the element be harmful to very much, and the 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 Sheet technique and manufacturing cost, plan sulphur content in steel and control below 0.008%, preferably control below 0.004%.
Chromium can significantly improve the hardening capacity of steel, can promote that carbon spreads to austenite, increases the stability of supercooled austenite, strongly can postpone perlitic transformation, is conducive to obtaining bainite structure.If Cr content can not play a role lower than 0.20%, as content can be easy to obtain martensite when cooling higher than 0.60% thus reduce bainite content.Therefore chromium content controls 0.20 ~ 0.40%, is preferably 0.30 ~ 0.48%.
Aluminium adds in order to deoxidation, when Al is containing quantity not sufficient 0.01%, can not play its effect; On the other hand, the aluminium owing to adding volume easily forms aluminum oxide agglomerate, so the regulation Al upper limit is 0.06%.Therefore, Als content is limited to 0.01 ~ 0.06% scope, is preferably: 0.03 ~ 0.041%.
Steel of the present invention adopts simple Composition Design, does not use the alloying elements such as Ti, Mo costly, has obvious cost advantage.And use RH vacuum-treat in production process of the present invention, the suitable treatment time can effectively be removed elemental gas in steel and carry out accurate adjustment to liquid steel temperature under lower vacuum-treat cost, and carries out the accurate control of alloying element in the process; In casting process, the selection of casting speed is carried out preferably under the prerequisite that production efficiency and inclusion fully float considering, and steel grade inclusion seldom can not impact the safety performance of the structural parts such as the automotive wheel produced; The abundant solid solution that preferably can ensure all even alloying element of continuous casting billet structure austenitizing of the acid extraction of strand, has remarkably influenced to room temperature texture's grain fineness number of steel and mechanical property; Hot rolling technology and process of cooling are thereafter the deterministic processes of steel room temperature texture of the present invention and mechanical property.The cooling mode of air cooling+water-cooled is taked after hot rolling of the present invention, without the need to the heat treatment step of complexity, this type of cooling can obtain ferrite and the bainite structure of proper ratio and form, thus obtain the steel with excellent reaming performance and mechanical property, whole production technique is relatively simple, is easy to produce.
The present invention combines by taking the smelting in above-mentioned composition and production process, continuous casting, heating, rolling and the type of cooling, the bainite content can producing cheap, processing characteristics and reaming excellent performance accounts for the FB steel of 10 ~ 25%, facts have proved, tensile strength >=the 490MPa of this steel, lower yield strength ReL >=330MPa, elongation A80 >=22%, hole expansibility >=90%, when manufacturing complex-shaped, the automotive wheel, the vehicle chassis component that have strict flange, reaming procedure calls, compare low-alloy high-strength steel and DP steel has unique advantage.
Accompanying drawing explanation
Fig. 1 is the metallurgical structure figure that tensile strength 490MPa level of the present invention has the Ferrite bainitic steel of high reaming performance.
Embodiment
To tensile strength 490MPa level of the present invention, there is the Ferrite bainitic steel of high reaming performance below in conjunction with the drawings and specific embodiments and production method is described in further details.
Embodiment 1
490MPa level thickness is the Ferrite bainitic steel plate of 2.0 millimeters, and its chemical composition percentage is: C:0.10%, Si:0.12%, Mn:0.97%, P:0.032%, S:0.005%, Cr:0.48%, Al:0.015%, surplus is Fe and inevitable impurity.
Its production method, comprises converter smelting, vacuum-treat, continuous casting, strand heating, roughing, finish rolling, the step that cools, batch, wherein: converter smelting time control tapping temperature is 1680 ~ 1685 DEG C; Vacuum processing time is 12min; During continuous casting, casting speed is at 0.9m/min; To slab heating temperature at 1230 ~ 1235 DEG C, soaking time 87min; Its end temp is controlled at 1050 ~ 1070 DEG C during roughing, the draft of roughing is 85%, adopt 7 frames to carry out finish rolling, control the finishing temperature of finish rolling at 810 ~ 840 DEG C, finish rolling total reduction is 94%, cooling adopts leading portion air cooling, back segment section cooling, it is 3 ~ 8 DEG C/s that leading portion cooling rate controls, and air cooling time is 5 ~ 7s, and the speed of cooling of back segment section cooling controls at 90 ~ 100 DEG C/s, when batching, oiler temperature control is at 420 ~ 460 DEG C.
After Plate Production, sample in the middle part of steel plate, after grinding, polishing, adopt nitric acid alcohol to corrode, for observing pattern and the distribution of ferrite and bainite structure.Adopt image analyzer to observe and measure ferrite and bainite structure content, as shown in Figure 1.Mechanical property is carried out according to GB/T 228.1 standard, reaming performance according to GBT24524-2009 " metal sheet and strip drifiting test method " by hole expansibility (
) experimental measurement evaluates.Concrete test method is as follows: sample on hot rolled strip, cuts into 90*90mm rectangular steel plates, adopts the mode of die stamping to process
centre hole.From the opposite sides of burr, the pyramid type drift of 60 ° is pressed into, determines Circularhole diameter Dh during current situation portion penetrating crack.
Its calculation formula is
=(Dh-D0)/D0 × 100%; In formula, D0 is the original processing diameter 10mm of sample center hole.
Detected result is as shown in table 1.
Embodiment 2
490MPa level thickness is the Ferrite bainitic steel plate of 3.5 millimeters, and its chemical composition percentage is: C:0.15%, Si:0.39%, Mn:0.57%, P:0.048%, S:0.006%, Cr:0.60%, Al:0.057%, remaining is Fe and inevitable impurity.
Its production method, comprise converter smelting, vacuum-treat, continuous casting, strand heating, roughing, finish rolling, the step that cools, batch, wherein: during converter smelting, tapping temperature is 1685 ~ 1690 DEG C; Vacuum processing time is 16min; During continuous casting, control casting speed at 1.2m/min; To strand heating, Heating temperature is at 1250 ~ 1280 DEG C, and soaking time is at 63min; During roughing, control its end temp at 1070 ~ 1090 DEG C, draft is 85%; Adopt 7 frames to carry out finish rolling, control its finishing temperature at 810 ~ 840 DEG C, draft is 90%; Carry out leading portion air cooling, cooling rate 3 ~ 8 DEG C/s, air cooling time 6 ~ 8s, carry out back segment section cooling, and speed of cooling controls, at 80 ~ 90 DEG C/s, to batch, and oiler temperature control is at 460 ~ 480 DEG C.
After Plate Production, sample in the middle part of steel plate, after grinding, polishing, adopt nitric acid alcohol to corrode, for observing pattern and the distribution of ferrite and bainite structure.
The comprehensive mechanical property detected the results are shown in Table shown in 1.
Embodiment 3
490MPa level thickness is the Ferrite bainitic steel plate of 4.0 millimeters, and its chemical composition percentage is: C:0.13%, Si:0.47%, Mn:0.89%, P:0.045%, S:0.004%, Cr:0.23%, Al:0.043%, remaining is Fe and inevitable impurity.
Its production method, comprises converter smelting, vacuum-treat, continuous casting, strand heating, roughing, finish rolling, the step that cools, batch, wherein: when carrying out converter smelting, controls tapping temperature at 1685 ~ 1690 DEG C; During vacuum-treat, the treatment time is at 15min; During continuous casting, control casting speed at 1.1m/min; Slab heating temperature is at 1230 ~ 1260 DEG C, and soaking time is at 76min; During roughing, control its end temp at 1060 ~ 1080 DEG C, draft is 84%; During finish rolling, control its finishing temperature at 800 ~ 830 DEG C, draft is 89%; When carrying out leading portion air cooling, cooling rate 3 ~ 8 DEG C/s, air cooling time 6 ~ 9s, when carrying out back segment section cooling, speed of cooling controls at 70 ~ 85 DEG C/s; When batching, oiler temperature control is at 440 ~ 470 DEG C.
After Plate Production, sample in the middle part of steel plate, after grinding, polishing, adopt nitric acid alcohol to corrode, for observing pattern and the distribution of ferrite and bainite structure.
The comprehensive mechanical property detected the results are shown in Table shown in 1.
Embodiment 4
490MPa level thickness is the Ferrite bainitic steel plate of 5.5 millimeters, and its chemical composition percentage is: C:0.12%, Si:0.35%, Mn:0.82%, P:0.043%, S:0.002%, Cr:0.41%, Al:0.048%, remaining is Fe and inevitable impurity.
Its production method, comprises converter smelting, vacuum-treat, continuous casting, strand heating, roughing, finish rolling, the step that cools, batch, wherein: during converter smelting, controls tapping temperature at 1680 ~ 1690 DEG C; Vacuum processing time is at 14min; During continuous casting, control casting speed at 1.0m/min; To slab heating temperature at 1240 ~ 1260 DEG C, heat-up time is at 85min; When carrying out roughing, control its end temp at 1060 ~ 1080 DEG C, draft is 85%; Control its finishing temperature during finish rolling at 800 ~ 820 DEG C, draft is 84%; When carrying out leading portion air cooling, cooling rate 3 ~ 8 DEG C/s, air cooling time 8 ~ 10s; When carrying out back segment section cooling, speed of cooling controls at 60 ~ 75 DEG C/s; Oiler temperature control is at 450 ~ 490 DEG C.
After Plate Production, sample in the middle part of steel plate, after grinding, polishing, adopt nitric acid alcohol to corrode, for observing pattern and the distribution of ferrite and bainite structure.
The comprehensive mechanical property detected the results are shown in Table shown in 1.
Table 1
Claims (3)
1. a tensile strength 490MPa level has the Ferrite bainitic steel of high reaming performance, it is characterized in that: its chemical composition percentage is: C:0.12 ~ 0.13%, Si:0.35 ~ 0.47%, Mn:0.60 ~ 0.82%, P:0.03 ~ 0.05%, S≤0.004%, Cr:0.30 ~ 0.48%, Al:0.03 ~ 0.041%, surplus is Fe and inevitable impurity; Its production method, comprise converter smelting, vacuum-treat, continuous casting, strand heating, roughing, finish rolling, the step that cools, batch, wherein: during described converter smelting, tapping temperature is 1680 ~ 1690 DEG C; Described vacuum processing time is 12 ~ 16min; During described continuous casting, casting speed is 0.9 ~ 1.2m/min; During described strand heating, be heated to 1230 ~ 1280 DEG C, insulation 60 ~ 90min; During described roughing, the end temp of roughing controls to be 1050 ~ 1090 DEG C, and draft controls as >=85%; During described finish rolling, finishing temperature control is at 800 ~ 840 DEG C, and total reduction controls as >=85%; Described when batching, oiler temperature control is at 420 ~ 500 DEG C; Described process for cooling is, leading portion air cooling, cooling rate 3 ~ 8 DEG C/s, and air cooling time is 5 ~ 10s, back segment section cooling, and speed of cooling controls at 60 ~ 100 DEG C/s.
2. tensile strength 490MPa level according to claim 1 has the Ferrite bainitic steel of high reaming performance, it is characterized in that: its metallographic structure is polygonal ferrite and bainite, wherein, ferritic volume content is 70 ~ 85%, and the volume content of bainite is 15 ~ 30%.
3. according to claim 1 or 2, tensile strength 490MPa level has the Ferrite bainitic steel of high reaming performance, it is characterized in that: during described finish rolling, adopts 7 frames to carry out finish rolling.
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| CN102409245A (en) * | 2011-11-16 | 2012-04-11 | 济南钢铁股份有限公司 | Hot-rolled dual-phase steel sheet with high-elongation flange performance and manufacturing method thereof |
| CN103328671A (en) * | 2011-03-18 | 2013-09-25 | 新日铁住金株式会社 | Hot-rolled steel sheet exhibiting exceptional press-molding properties and method for manufacturing same |
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| JP4737319B2 (en) * | 2009-06-17 | 2011-07-27 | Ｊｆｅスチール株式会社 | High-strength galvannealed steel sheet with excellent workability and fatigue resistance and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103328671A (en) * | 2011-03-18 | 2013-09-25 | 新日铁住金株式会社 | Hot-rolled steel sheet exhibiting exceptional press-molding properties and method for manufacturing same |
| CN102409245A (en) * | 2011-11-16 | 2012-04-11 | 济南钢铁股份有限公司 | Hot-rolled dual-phase steel sheet with high-elongation flange performance and manufacturing method thereof |
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Effective date of registration: 20170717 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. |
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