CN104195443A - High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof - Google Patents
High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of steel rolling, and particularly relates to high-flexural-behavior hot-formed steel used for automobiles and a manufacturing method thereof. The steel comprises following trace elements by mass: 0.18-0.3% of C, not more than 0.3% of Si, 1-1.6% of Mn, not more than 0.015% of P, not more than 0.002% of S, 0.1-0.3% of Cr, 0.02-0.06% of Ti, 0.02-0.06% of Al, 0.0005-0.004% of B, not more than 0.004% of [N] and not more than 0.003% of [O]. The manufacturing method includes: heating a casting blank at a low temperature, performing controlled rolling in two stages, rapidly cooling, reeling up at a low temperature, preparing a steel coil by cold rolling and low-temperature critical annealing, shearing to prepare component tablets and performing hot press molding. By the manufacturing method, steel crystal grains are refined and ductility and toughness of the steel are enhanced, so that more energy is absorbed during deformation of the steel and automobile safety performance is enhanced.
Description
Technical field
The invention belongs to technical field of steel rolling, particularly high anti-bending strength thermoforming steel and manufacture method thereof for a kind of automobile.
Background technology
Along with the development of automobile industry,, continuous progress and the people of science and technology are more and more higher for the requirement of automotive light weight technology and security, to forming the requirement of the plate property of automobile, also improve thereupon.
At present, on body of a motor car and auto parts, widely apply the requirement that high strength and ultrahigh-strength steel plates can automobile lightweight, but along with the increase of armor plate strength, especially for ultrahigh-strength steel plates more than 1000MPa, its stamping performance declines rapidly, and die wear is serious.When being shaped, cold stamping easily there is cracking and the serious bad phenomenon of resilience, during the part of the complicated shape that is especially shaped.And adopt the hot press-formed technology of steel plate can effectively alleviate the problems referred to above, its process is for to be heated to by steel plate the temperature range that austenite is corresponding, utilize the features such as at high temperature plasticity increase of steel plate and resistance to deformation reduce, Quick-forming in the mould of cooling system is housed, under packing state by being arranged on the cooling system quench cooled in mould, to obtain superstrength part, and shape and the dimensional precision of part have been guaranteed.The hot press-formed technology of describing by said process solved in traditional cold forming technology high-strength steel be shaped difficulty, resilience is serious and the difficult problem such as shape defect, be widely used in the manufacture of the structural safety parts such as bumper, crash bar, A B C post and middle passage.
200810112020.2 1 kinds of thermal forming martensite steels of the patent No., the main chemical compositions of this steel forms (% by weight): C:0.10-0.33%, Si:0.50-2.30%, Mn:0.50-2.00%, P≤0.020%, S≤0.015%, Al:0.015-0.060%, [O]≤0.002%, [N] 0.002-0.015%, remaining is Fe and inevitable impurity.Its tensile strength is 1.3-1.7GPa, unit elongation is higher than 15% thermal forming martensite steel, main by adding the Si of 0.50-2.30%, in thermoforming operation, before martensitic transformation, adopts retarded cooling process, obtain the method for a certain amount of residual austenite, improve unit elongation.Yet during this method thermoforming, technique controlling difficulty is large, and production efficiency is low.
The heat treating method of high-strong toughness thermoforming steel plate for 201110269388.1 1 kinds of automobiles of the patent No., by composition quality percentage composition, be: C:0.2～0.4%, Si:0.1～0.5%, Mn:1.0～2.0%, Cr:0.1～0.5%, B:0.001～0.005%, Ti:0.01～0.05%, Al:0.01～0.1%, P:<0.02%, S:<0.01%, N:<0.01%, surplus is that the thermoforming of iron and inevitable impurity is put into annealing furnace with steel plate after stamping; Within the scope of 100～500 ℃, carry out the temper of 1～10min; Steel plate after temper is taken out to annealing furnace, in air, naturally cool to room temperature.This invention, on the basis of traditional thermoforming steel, is eliminated internal stress and the softening martensitic stucture of the quick cooling generation of steel plate by the method for tempering, and then improves the toughness of high-strength toughness steel, but its intensity also has comparatively significantly reduction.
The preparation method of 201110259342.1 1 kinds of double-phase forming steels of the patent No., the main chemical compositions mass percent of this steel is: C:0.1～0.5%, Si:0.3～2.5%, Mn:1.0～3.0%, Al:1.0～3.0%, P:<0.02%, S:<0.01%, N:<0.01%, and surplus is iron and inevitable impurity; Manufacture method is: first according to chemical composition, carry out metallurgy and foundry, former material base enters process furnace heating, and Heating temperature is 1200～1250 ℃, is incubated 0.5～1.5 hour, and finishing temperature is 800～900 ℃, and coiling temperature is 600～700 ℃; Heat forming technology is: Heating temperature is 750～850 ℃, insulation 3～8min, to be greater than the speed of 40 ℃/s, be chilled to room temperature, by the embark on journey Heating temperature of technique of heat is set, be mainly 780-850 ℃, and then make forming steel in austenite and two phase regions corresponding to ferrite, fast coolingly can obtain the duplex structure being formed by ferrite and martensite.Though by this method, the steel plate plasticity after shaping is increased, intensity significantly reduces.
In addition, be widely used at present the thermoforming steel of automobile, after thermoforming quench cooled, and all change into after martensitic stucture, its intensity can reach 1500MPa left and right, and unit elongation A50 is at 5-7%, three-point bending angle is generally below 65 degree, and along with the raising of martensitic steel intensity, the susceptibility that hydrogen causes delayed fracture improves, and the susceptibility that hydrogen causes delayed fracture improves.Along with vehicle safety performance being required to continue to improve, require thermoforming steel in proof strength, to there is better toughness and anti-delayed fracture performance.
Therefore, need high anti-bending strength thermoforming steel and manufacture method thereof for a kind of automobile badly.
Summary of the invention
Technical problem to be solved by this invention is to provide high anti-bending strength thermoforming steel and manufacture method thereof for a kind of automobile, to realize the austenite crystal of refinement thermoforming steel, improve unit elongation, tensile strength and three-point bending angle, and then realize the lightweight of automobile frame and automobile component.
For solving the problems of the technologies described above, the invention provides high anti-bending strength thermoforming steel for a kind of automobile, comprise the chemical composition of following mass percent: C:0.18～0.30%, Si≤0.30%, Mn:1.00～1.60%, P≤0.015%, S≤0.0020%, Cr:0.10～0.30%, Ti:0.02～0.06%, Al:0.020～0.060%, B:0.0005～0.0040%, [N]≤0.004%, [O]≤0.003%, surplus is Fe and inevitable inclusion.
Further, also comprise the chemical composition of following mass percent: Nb:0.02～0.10%, Mo:0.15-0.40%, V≤0.10%, W≤0.40%, REM≤0.05%.
Further, before the thermoforming of described thermoforming steel-austenitic average grain size≤10um, ratio of martensite >=98% after thermoforming.
High anti-bending strength thermoforming steel for a kind of automobile provided by the invention, by optimizing the chemical composition ratio of thermoforming steel, the austenite crystal of refinement steel, plasticity and the toughness of raising steel; While is further added Nb, Mo, V, W and the REM trace element of definite quality per-cent, the austenite crystal of further refinement steel, plasticity and the toughness of raising steel.
The present invention also provides the manufacture method of a kind of automobile with high anti-bending strength thermoforming steel, and described manufacture method comprises:
Molten iron is carried out to the smelting of pre-treatment rear converter, and after Alloying Treatment and refining, continuous casting becomes strand;
Described strand is heated between 1100 ℃～1250 ℃, and is incubated;
Described strand is carried out to hot rolling processing, and described hot rolling is processed and is comprised that two stages, first stage are roughing, and subordinate phase is finish rolling, and the roughing draft of described roughing is less than the finish rolling draft of described finish rolling;
Described finish rolling finishes rear described strand to be carried out to cooling process;
After described cooling process, batch, the temperature of coiling process is controlled between 540 ℃-650 ℃;
The volume that rolls by temperature between 540 ℃-650 ℃ is cooled to normal temperature, carries out the cold rolling chill volume that obtains after pickling, controls cold rolling total reduction between 50%-70%;
Described cold rolling coil is carried out to low temperature critical annealing, obtain annealing volume;
Described annealing volume is processed into part tablet, and described part tablet is heated to a little higher than Ar3 transformation temperature;
Part tablet after heating is carried out to hot compacting processing, make described part tablet with the speed of cooling die quenching that is greater than 40 ℃/s to being less than or equal to 200 ℃.
Further, described and be incubated and comprise being heated between described strand insulation between 1100 ℃～1250 ℃ 2.8 hours-4 hours.
Further, the finish rolling draft that the roughing draft of described roughing is less than described finish rolling comprises that controlling roughing draft is greater than 75%, and finish rolling draft is greater than 85%.
Further, the temperature of described finish rolling is controlled between 820 ℃～890 ℃.
Further, described finish rolling finishes described strand is carried out to cooling process to comprise that controlling described finish rolling finishes to the time between cooling beginning in 1S afterwards, and described cooling process is that laminar flow is cooling, and speed of cooling is greater than 15 ℃/s.
With respect to prior art, the manufacture method of high anti-bending strength thermoforming steel for a kind of automobile provided by the invention, by slab heating temperature, be controlled at the lesser temps between 1100～1250 ℃, and be incubated 2.8h-4h, make the homogeneous microstructure of strand, prevent excessively growing up of austenite crystal in tissue; In hot-rolled process, adopt first roughing, the two procedures of rear finish rolling, wherein the draft of roughing is greater than 75%, the draft of finish rolling is greater than 85%, and the temperature of controlling finish rolling is between 820-890 ℃, make between dynamic in rough rolling process and passage static fully, austenite crystal is not in crystallizing field accumulation gross distortion, and austenite crystal intragranular forms the deformation bands of high energy storage in finishing stands, suppress part recrystallize between passage, promote sub-dynamic recrystallization and the Strain Accumulation in multi-pass finish rolling stage, obtain tiny and uniform austenite crystal; And by control finish rolling finish to the time of cooling beginning be in 1S, speed of cooling be controlled at 15 ℃/more than s, curling temperature is controlled at 540-650 ℃, has avoided the austenite crystal after finish rolling further to grow up; In addition, adopt low temperature critical annealing, controlled the rear grain size of annealing, part tablet is heated to a little higher than its transformation temperature, controlled the austenite grain size of thermoforming steel.By above Method and process, further promoted unit elongation and the angle of bend of thermoforming steel, in distortion, absorb more energy, improve the safety performance of vehicle, and realized the lightweight of automobile frame and component.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The figure of typical organization of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 1 provides for embodiment of the present invention one to embodiment six;
The schematic flow sheet of the manufacture method of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 2 provides for embodiment of the present invention two.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain, belongs to the scope of protection of the invention.
Embodiment one
High anti-bending strength thermoforming steel for a kind of automobile provided by the invention, comprises the chemical composition of following mass percent: C:0.18～0.30%, Si≤0.30%, Mn:1.00～1.60%, P≤0.015%, S≤0.0020%, Cr:0.10～0.30%, Ti:0.02～0.06%, Al:0.020～0.060%, B:0.0005～0.0040%, [N]≤0.004%, [O]≤0.003%, surplus is Fe and inevitable inclusion.In addition, be also added with the chemical composition of following mass percent: Nb:0.02～0.10%, Mo:0.15-0.40%, V≤0.10%, W≤0.40%, REM≤0.05%.
Wherein, carbon (C): solution strengthening element, plays a decisive role to the intensity of steel plate.For making more than the tensile strength of thermoforming steel reaches 1300MPa, C content need reach more than 0.18%, and along with the raising of carbon content, cold working difficulty, welding property worsens.Therefore C content is controlled to 0.18-0.30%, reduces difficulty of processing in the tensile strength that guarantees thermoforming steel.
Silicon (Si): solution strengthening element, can suppress separating out of carbide, but along with the raising of Si content, can make Heating temperature improve, in the present embodiment, the upper limit content of Si is set as 0.3%.Because excessively reduce Si content, can increase manufacturing cost, so the present invention is controlled at Si content below 0.30%.
Manganese (Mn): austenite stabilizer element, postpone the transformation of perlite and bainite, expand γ phase region, significantly improve the hardening capacity of steel.But along with Mn content improves, the toughness of thermoforming steel and plasticity are all reduced.Therefore, the present invention is controlled at 1.00-1.60% by Mn content, when guaranteeing thermoforming steel hardenability, keeps certain toughness and plasticity.
Phosphorus (P): solution strengthening element, but P is easily at grain boundary segregation, the fragility that makes steel especially low temperature brittleness enlarges markedly, improved the susceptibility that hydrogen causes delayed fracture simultaneously, therefore reduce the content of P as far as possible, consider the cost of manually removing P, P content should be controlled at below 0.015%, makes the less than normal and hydrogen of thermoforming steel brittleness cause the susceptibility of delayed fracture lower.
Sulphur (S): the hot-short performance of remarkably influenced steel plate, worsen hot press-formed performance, reduce the toughness plasticity of steel, and make hydrogen cause the rising of delayed fracture susceptibility, consider the cost of manually removing S, S content should be controlled at below 0.002%.
Aluminium (Al): the reductor during as steel-making, reduce oxide inclusion, pure steel in steel, crystal grain thinning, improves toughness, has particularly reduced the brittle transition temperature of steel.Content acts on lower than 0.015% time not obvious, easily forms thick alumina inclusion higher than 0.06%, worsens the toughness of steel.Therefore the present invention is controlled at Alt content between 0.020-0.060%, guarantees that thermoforming steel is in the high corresponding aluminium content interval of toughness.
Chromium (Cr): effectively improve the hardening capacity of steel, improve intensity and the toughness of steel, and prevent high temperature surface oxidation.But too high Cr content can increase bainite and form.Therefore, the present invention is controlled at 0.10-0.30% by Cr content, has guaranteed that thermoforming steel is in intensity and the high corresponding chromium content interval of toughness.
Titanium (Ti): add Ti so that fixedly impurity element O and N etc., thereby make B in solid solution state, and segregation in crystal boundary to bring into play its effect, and when the carboritride forming can suppress to heat effectively, austenite crystal grows up, crystal grain thinning,, intensity and the toughness of raising steel plate, reduce the susceptibility that hydrogen causes delayed fracture.But titanium easily forms block nitride higher than 0.10% time, and toughness plasticity is reduced.Therefore, Ti content of the present invention is controlled at 0.02-0.06%, has substantially avoided block muriatic formation, has guaranteed toughness and the plasticity of thermoforming steel.
Boron (B): effectively improve the hardening capacity of steel, easily segregation, on crystal boundary, reduces lattice omission and the hole in crystal boundary region, and crystal boundary free energy reduces, thereby reaches grain-boundary strengthening effect, and the crackle postponing on crystal boundary forms.And its content acts on lower than 0.0005% time not obvious, effect increases not obvious higher than 0.0050% time.The present invention is controlled at 0.00050-0.0040% by B content, has improved the hardening capacity of thermoforming steel.
Nitrogen [N]: easily with Al, Ti, Nb, B etc. in conjunction with forming compound, but excessive N can form boron nitride with B, cannot bring into play the effect of nitrogen, and increases the formation of crack while being out of shape.Therefore [N] content should be controlled at below 0.0040%, avoids the quantity in expanded crack source.
In addition, in order further to improve the characteristic of thermoforming steel, except above-mentioned alloying element, also can add at least one of following alloying element:
Niobium (Nb): the carbon enrichment in grain refining, transformation behavior, austenite and martensitic forming core are being brought into play to remarkable effect, and the anti-hydrogen that improves steel causes delayed fracture ability.The above effect lower than 0.02% time of its content is not obvious, forms too much carbonitride higher than 0.10% time to make poor processability, and needs to improve Heating temperature.Therefore, the content of Nb should be controlled at 0.02-0.10%, refinement crystal grain, the anti-hydrogen that has improved steel causes delayed fracture ability.
Molybdenum (Mo): can improve hardening capacity, refine austenite crystal grain, suppresses bainite transformation, and the hydrogen that reduces steel causes delayed fracture susceptibility.Its content is difficult to function as described above lower than 0.15% time, when content surpasses 0.40% above effect not obvious, and cost is higher, therefore, in the present embodiment, controls Mo content between 0.15-0.40%, plays above-mentioned effect.
V: energy refine austenite crystal grain while existing with tiny carbonitride form, improve toughness, the hydrogen that reduces steel causes delayed fracture susceptibility; While existing with solid solution form, can improve hardening capacity, thereby improve intensity, add in right amount and can improve performance, easily form macrobead carbonitride higher than 0.1% time, toughness plasticity is reduced.Therefore, in the present embodiment, V content is controlled at below 0.1%, plays above-mentioned way.
REM: the tiny carbonitride of formation is refine austenite crystal grain effectively, for guaranteeing its useful effect, its content is controlled at below 0.05%.
High anti-bending strength thermoforming steel for a kind of automobile provided by the invention, the chemical composition that comprises following mass percent: C:0.18～0.30%, Si≤0.30%, Mn:1.00～1.60%, P≤0.015%, S≤0.0020%, Cr:0.10～0.30%, Ti:0.02～0.06%, Al:0.020～0.060%, B:0.0005～0.0040%, [N]≤0.004%, [O]≤0.003%, make the crystal grain of thermoforming steel careful evenly, good percentage elongation, angle of bend is high, when vehicle collision, can bear larger distortion, and then absorb more energy, effectively realized the lightweight of automobile frame or component, improved the safety coefficient of vehicle.Further in thermoforming steel, add the chemical composition of following mass percent: Nb:0.02～0.10%, Mo:0.15-0.40%, V≤0.10%, W≤0.40%, REM≤0.05%, further by the isoparametric control of flow-route and temperature, the initial austenite average grain size of thermoforming steel is controlled at and is less than 10um, ratio of martensite is more than or equal to 98%, makes its tensile strength at 1300-1800MPa, unit elongation >=8%, three-point bending angle >=75 °.The thermoforming structure of steel structure obtaining is shown in Fig. 1, the figure of typical organization of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 1 provides for embodiment of the present invention one to embodiment six.
Embodiment two
As shown in Figure 2, the schematic flow sheet of the manufacture method of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 2 provides for the embodiment of the present invention two.
Step S10: molten iron is carried out to the smelting of pre-treatment rear converter, and continuous casting becomes strand after Alloying Treatment and refining.In the present embodiment, molten iron, by KR desulfurization pre-treatment and complete three de-converter smelting process, is controlled to the content of the harmful element such as sulphur and phosphorus in molten steel, and adopted LF stove refining treatment, so that the content of each chemical composition in accurate control molten steel, then utilizes continuous caster to obtain needed strand.
The strand obtaining is by the way by the chemical composition of following mass percent: C:0.18～0.30%, Si≤0.30%, Mn:1.00～1.60%, P≤0.015%, S≤0.0020%, Cr:0.10～0.30%, Ti:0.02～0.06%, Al:0.020～0.060%, B:0.0005～0.0040%, [N]≤0.004%, [O]≤0.003%Nb:0.02～0.10%, Mo:0.15-0.40%, V≤0.10%, W≤0.40%, REM≤0.05%, surplus is that Fe and inevitable inclusion form.
Step S20: described strand is heated between 1100 ℃～1250 ℃, and is incubated.In the present embodiment, in strand, there is the trace amount of titanium adding, in order to make trace amount of titanium separate out appropriate TiN in the process of heating, strand is heated to certain temperature between 1100 ℃～1250 ℃ and is incubated 2.8h-4h, make stablely in strand to separate out tiny TiN.
Step S30: described strand is carried out to hot rolling processing, and described hot rolling is processed and comprised that two stages, first stage are roughing, and subordinate phase is finish rolling, and the roughing draft of described roughing is less than the finish rolling draft of described finish rolling.In the present embodiment, hot rolling adopts roughing and finish rolling two-stage control to be rolled.Wherein the first stage is roughing, control its roughing draft and be greater than 75%, main by sufficient Static Recrystallization refine austenite crystal grain between dynamic and passage, and then not in crystallizing field accumulation gross distortion, subordinate phase is finish rolling, control finish rolling draft and be greater than 85%, and the temperature in control finishing stands is between 820-890 ℃, makes the temperature of finish rolling near non-recrystallization temperature.
Step S40: described finish rolling finishes rear described strand to be carried out to cooling process.In the present embodiment, for avoiding further growing up of crystal grain after finish rolling, finish rolling finishes to be controlled in 1S to the time beginning to cool down, and speed of cooling be controlled at 15 ℃/more than s, wherein cooling process is that laminar flow is cooling.
Step S50: batch after described cooling process, the temperature of coiling process is controlled between 540 ℃-650 ℃.
Step S60: temperature is carried out to the cold rolling chill volume that obtains after rolling between 540 ℃-650 ℃ rolled up pickling, control cold rolling total reduction between 50%-70%.In the present embodiment, according to the requirement of final steel thickness, hot rolling by temperature between 540 ℃-650 ℃ is cooled to room temperature, after volume pickling, carry out cold-rolling treatment, and control cold rolling total reduction between 50%-70%, make the inner deformation bands that forms high energy storage of crystal grain, for follow-up recrystallization annealing provides motivating force.
Step S70: described cold rolling coil is carried out to low temperature critical annealing, obtain annealing volume.In the present embodiment, for further controlling the grain size after annealing, adopt low temperature critical annealing crystal grain thinning technology, according to band composition of steel, specification, the volume index such as heavily, by controlling heating rate, Heating temperature and soaking time, the final average grain size of controlling annealing volume is less than 8um.
Step S80: described annealing volume is processed into part tablet, and described part tablet is heated to a little higher than transformation temperature.In the present embodiment, transformation temperature is not more than 900 ℃, and transformation temperature is Ar3.
Step S90: the part tablet after heating is carried out to hot compacting processing, make described part tablet with the speed of cooling die quenching that is greater than 40 ℃/s to being less than or equal to 200 ℃.In the present embodiment, make part tablet be down to 180 ℃ with the speed of cooling die quenching of 60 ℃/s.
The manufacture method of high anti-bending strength thermoforming steel for a kind of automobile of the present invention, by slab heating temperature, be controlled at the lesser temps between 1100～1250 ℃, and be incubated 2.8h-4h, and make the homogeneous microstructure of strand, prevent excessively growing up of austenite crystal in tissue; In hot-rolled process, adopt first roughing, the two procedures of rear finish rolling, wherein the draft of roughing is greater than 75%, the draft of finish rolling is greater than 85%, and the temperature of controlling finish rolling is between 820-890 ℃, make between dynamic in rough rolling process and passage static fully, austenite crystal is not in crystallizing field accumulation gross distortion, and austenite crystal intragranular forms the deformation bands of high energy storage in finishing stands, suppress part recrystallize between passage, promote sub-dynamic recrystallization and the Strain Accumulation in multi-pass finish rolling stage, obtain tiny and uniform austenite crystal; And by control finish rolling finish to the time of cooling beginning be in 1S, speed of cooling be controlled at 15 ℃/more than s, curling temperature is controlled at 540-650 ℃, has avoided the austenite crystal after finish rolling further to grow up; In addition, adopt low temperature critical annealing, controlled the rear grain size of annealing, part tablet is heated to transformation temperature, controlled the austenite grain size of thermoforming steel.By above Method and process, further promoted unit elongation and the angle of bend of thermoforming steel, in the change of being expert at, absorb more energy, improve the safety performance of vehicle, and realized the lightweight of automobile frame and component.The thermoforming structure of steel structure obtaining is shown in Fig. 1, the figure of typical organization of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 1 provides for embodiment of the present invention one to embodiment six.
Embodiment three
By thering is the slab of chemical composition as described in embodiment 1, according to the manufacture method of embodiment two, carry out hot rolling (composition is in Table 1 in detail), wherein Heating temperature is 1220 ℃, roughing total reduction is 84%, finish rolling total reduction is 91%, final rolling temperature is 860 ℃, in finish rolling, finishing up to the time period beginning to cool down is 0.5s, 20 ℃/s of speed of cooling.And in the time of 600 ℃ curling acquisition hot rolled coil, the mean sizes that obtains hot rolled coil crystal grain is about 6um.To after hot rolled coil pickling, be cold-rolled to 1.1mm, the chill volume of smooth acquisition after annealing, the average grain size of chill volume is 7.0um left and right.Chill volume is sheared after blanking, be heated to 880 ℃, and be transferred to press after being incubated 4 minutes, carry out hot-forming.Finally, to be greater than the speed of cooling die quenching to 180 ℃ of 40 ℃/s, obtain thermoforming part.From thermoforming part sampling organize, the detection such as mechanical property, three-point bending performance, anti-delayed fracture, wherein three-point bending detects and adopts German VDA238-100 standard to test, mechanical property adopts A50 (12.5 * 50mm) sample to press DIN EN ISO6892-1 and detects, anti-delayed fracture test detects by the method for certain high-end car enterprise standard regulation: the region of choosing part deformation maximum, keep envrionment temperature in the interval of 22 ℃ ± 2 ℃, at 5%H2SO4, soak 10min post rinsing clean, after 1 hour, observing matrix has flawless.And data are recorded in table 2.The thermoforming structure of steel structure obtaining is shown in Fig. 1, the figure of typical organization of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 1 provides for embodiment of the present invention one to embodiment six.
Embodiment four
By thering is the slab of chemical composition as described in embodiment 1, according to the manufacture method of embodiment two, carry out hot rolling (composition is in Table 1 in detail), wherein Heating temperature is 1220 ℃, roughing total reduction is 82%, finish rolling total reduction is 89%, final rolling temperature is 850 ℃, in finish rolling, finishing up to the time period beginning to cool down is 0.5s, 25 ℃/s of speed of cooling, and in the time of 580 ℃ curling acquisition hot rolled coil, the mean sizes of hot rolled coil crystal grain is 5.1um left and right, to after hot rolled coil pickling, be cold-rolled to 1.5mm, the chill volume of smooth acquisition after annealing, the average grain size 6.0um left and right of chill volume, chill volume is sheared after blanking, be heated to 890 ℃, be incubated and be transferred to press after 4 minutes, carry out hot-forming, finally to be greater than the speed of cooling die quenching to 180 ℃ of 40 ℃/s, obtain thermoforming part.By method described in embodiment three, carry out the correlation detection of part again.And the data of observing are recorded in table 2.The thermoforming structure of steel structure obtaining is shown in Fig. 1, the figure of typical organization of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 1 provides for embodiment of the present invention one to embodiment six.
Embodiment five
By thering is the slab of chemical composition as described in embodiment 1, according to the manufacture method of embodiment two, carry out hot rolling (composition is in Table 1 in detail), wherein Heating temperature is 1250 ℃, roughing total reduction is 80%, finish rolling total reduction is 88%, final rolling temperature is 880 ℃, in finish rolling, finishing up to the time period beginning to cool down is 0.5s, 18 ℃/s of speed of cooling, and in the time of 620 ℃ curling acquisition hot rolled coil, the mean sizes of hot rolled coil crystal grain is 6.3um left and right, to after hot rolled coil pickling, be cold-rolled to 1.6mm, the chill volume of smooth acquisition after annealing, the average grain size of chill volume is 7.8um left and right, chill volume is sheared after blanking, be heated to 900 ℃, be incubated and be transferred to press after 5 minutes, carry out hot-forming, finally to be greater than the speed of cooling die quenching to 180 ℃ of 40 ℃/s, obtain thermoforming part.By method described in embodiment three, carry out the correlation detection of part again.And the data of observing are recorded in table 2.The thermoforming structure of steel structure obtaining is shown in Fig. 1, the figure of typical organization of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 1 provides for embodiment of the present invention one to embodiment six.
Embodiment six
By thering is the slab of chemical composition as described in embodiment 1, according to the manufacture method of embodiment two, carry out hot rolling (composition is in Table 1 in detail), wherein Heating temperature is 1180 ℃, roughing total reduction is 80%, finish rolling total reduction is 92%, final rolling temperature is 850 ℃, finish rolling finish to the time beginning to cool down be 0.5s, 30 ℃/s of speed of cooling, 560 ℃ of curling acquisition hot rolled coils, the mean sizes 5um of hot rolled coil crystal grain, to after hot rolled coil pickling, be cold-rolled to 1.4mm, the chill volume of smooth acquisition after annealing, the average grain size 6.4um of chill volume, chill volume is sheared after blanking, be heated to 880 ℃, be incubated and be transferred to press after 4 minutes, carry out hot-forming, to be greater than the speed of cooling die quenching to 180 ℃ of 40 ℃/s, obtain thermoforming part.By method described in embodiment three, carry out the correlation detection of part again.And the data of observing are recorded in table 2.The thermoforming structure of steel structure obtaining is shown in Fig. 1, the figure of typical organization of high anti-bending strength thermoforming steel for a kind of automobile that Fig. 1 provides for embodiment of the present invention one to embodiment six.
The chemical composition of table 1 embodiment (weight, %)
The corresponding tissue of table 2 embodiment and mechanical property
Detected result from the corresponding embodiment three of table 2 to embodiment six correspondences, the intensity of thermoforming steel of the present invention, unit elongation, three-point bending angle and anti-delayed fracture performance all meet certain high-end car and look forward to requirement, and three-point bending angle is much larger than its standard-required, when vehicle collision, can bear larger distortion, absorb more energy, improve the safety performance of vehicle.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (8)
1. a high anti-bending strength thermoforming steel for automobile, is characterized in that, comprises the chemical composition of following mass percent: C:0.18～0.30%, Si≤0.30%, Mn:1.00～1.60%, P≤0.015%, S≤0.0020%, Cr:0.10～0.30%, Ti:0.02～0.06%, Al:0.020～0.060%, B:0.0005～0.0040%, [N]≤0.004%, [O]≤0.003%, surplus is Fe and inevitable inclusion.
2. high anti-bending strength thermoforming steel for automobile as claimed in claim 1, is characterized in that, also comprises the chemical composition of following mass percent: Nb:0.02～0.10%, Mo:0.15-0.40%, V≤0.10%, W≤0.40%, REM≤0.05%.
3. high anti-bending strength thermoforming steel for automobile as claimed in claim 1, is characterized in that the mean sizes≤10um of the austenite crystal before the thermoforming of described thermoforming steel, ratio of martensite >=98% after thermoforming.
4. a manufacture method for high anti-bending strength thermoforming steel for automobile, is characterized in that: described manufacture method comprises:
Molten iron is carried out to the smelting of pre-treatment rear converter, and after Alloying Treatment and refining, continuous casting becomes strand;
Described strand is heated between 1100 ℃～1250 ℃, and is incubated;
Described strand is carried out to hot rolling processing, and described hot rolling is processed and is comprised that two stages, first stage are roughing, and subordinate phase is finish rolling, and the roughing draft of described roughing is less than the finish rolling draft of described finish rolling;
Described finish rolling finishes rear described strand to be carried out to cooling process;
After described cooling process, batch, the temperature of coiling process is controlled between 540 ℃-650 ℃;
The volume that rolls by temperature between 540 ℃-650 ℃ is cooled to normal temperature, carries out the cold rolling chill volume that obtains after pickling, controls cold rolling total reduction between 50%-70%;
Described cold rolling coil is carried out to low temperature critical annealing, obtain annealing volume;
Described annealing volume is processed into part tablet, and described part tablet is heated to a little higher than Ar3 transformation temperature;
Part tablet after heating is carried out to hot compacting processing, make described part tablet with the speed of cooling die quenching that is greater than 40 ℃/s to being less than or equal to 200 ℃.
5. the manufacture method of high anti-bending strength thermoforming steel for automobile as claimed in claim 4, is characterized in that, described and be incubated and comprise being heated between described strand insulation between 1100 ℃～1250 ℃ 2.8 hours-4 hours.
6. the manufacture method of high anti-bending strength thermoforming steel for automobile as claimed in claim 4, is characterized in that, the finish rolling draft that the roughing draft of described roughing is less than described finish rolling comprises that controlling roughing draft is greater than 75%, and finish rolling draft is greater than 85%.
7. the manufacture method of high anti-bending strength thermoforming steel for automobile as claimed in claim 4, is characterized in that, the temperature of described finish rolling is controlled between 820 ℃～890 ℃.
8. the manufacture method of high anti-bending strength thermoforming steel for the automobile as described in claim 1 to 6 any one, it is characterized in that, described finish rolling finishes described strand is carried out to cooling process to comprise that controlling described finish rolling finishes to the time between cooling beginning in 1S afterwards, described cooling process is that laminar flow is cooling, and speed of cooling is greater than 15 ℃/s.
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Application publication date: 20141210 |