CN103290312B - Production method for increasing work hardening value of 440MPa-level carbon structural steel - Google Patents
Production method for increasing work hardening value of 440MPa-level carbon structural steel Download PDFInfo
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Abstract
The invention provides a production method for increasing the work hardening value of 440MPa-level carbon structural steel. According to the production method, traditional carbon structural steel is used as a cold rolling base material, an approximately complete-austenitizing two-phase region is adopted for heating to obtain 80%-100% austenite, two segments of cooling modes are adopted, and finally polygonal ferrite of which the area percent is 85%-95% in a metallographic phase diagram, a cementite and granular bainite mixture of which the area percent is 5-12% in the metallographic phase diagram, and martensite and austenite tissues of which the area percent is 1%-2% in the metallographic phase diagram are obtained by temperature change and overageing. As having purer proeutectoid ferrite and low-temperature transformation hard phase, the pattern of tissue has better additive index than that of the traditional recrystallized annealed carbon structural steel. According to the production method for increasing the work hardening value of 440MPa-level carbon structural steel provided by the invention, the hardening index of the obtained 440MPa-level carbon structural steel is as high as 0.18-0.20.
Description
Technical field
The invention belongs to smelting iron and steel processing technique field, particularly a kind of production method improving 440MPa level structural carbon steel work hardening value.
Background technology
Cold rolled continuous annealing structural carbon steel primary alloy constituent is C, Mn element, belongs to one of automobile cold-rolled high-strength steel of solution strengthening.This steel grade domestic mainly adopts the trade mark supplies of material such as marking the JIS G3135:2006 trade mark SPFC390, SPFC440 day, each Iron And Steel Company also to have the enterprise's trade mark of oneself at present, as: Baosteel company Q/BQB410-2009 standard and wherein trade mark B240ZK, B280VK etc.
Use in the process of this steel grade at automobile stamping enterprise practical, there is the bulging problem of Cracking of zonule, the bulging of these zonules, material can not fully flow into bulging district, and the shape after relying on the homogeneous strain of material self to obtain punching press.Strain analysis shows, improve the generous strain ratio (r value) of material, thinning not easily generation of thickness direction is made can effectively to improve bulging ability, but this method to low-carbon (LC) or ultralow-carbon deep-draw compressed steel practical because low carbon and manganese content coordinates suitable rolling and annealing process can obtain good texture.And for the relatively high structural carbon steel of carbon and manganese content, rely on texture controlling to obtain good r value Feasible degree little.But improve the Strain partitioning homogeneity of this kind of steel grade in deformation process, the extended capability improving strain can make the reduced thickness of steel plate in punching course evenly occur, to postpone the stamping cracking that local reduction causes.According to metal plastic deformation principle, the hardenability value improving material can obtain good homogenize material deformability, when material regional area generation large sstrain, there is strong stress increment occur to stop distortion and transfer to the little region of deformed region further, so make to strain even expansion.For this reason, the hardening capacity improving structural carbon steel is explored significant with the bulging problem of Cracking of tackling zonule.Traditional continuous annealing process of carbon element knot steel is recrystallization zone annealing, realizes chillly organizing recrystallize, is finally present in final finished with ferritic-pearlitic organizational form, effectively can not meets the requirement of large bulging drape forming.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of by improving the adjustment of annealing process realization tissue with the production method improving 440MPa level structural carbon steel work hardening value.
For solving the problems of the technologies described above, the invention provides a kind of production method improving 440MPa level structural carbon steel work hardening value, comprising the steps:
1) by percentage to the quality, the chemical composition of steel is: 0.04≤C≤0.08; Si≤0.3; 0.9≤Mn≤1.3; P≤0.015%; S≤0.015%; Alt >=0.015%; N≤0.005%; Surplus is Fe and inevitable impurity, the steel of mentioned component is carried out desulfurization, bessemerizes, RH vacuum refinement, continuous casting obtain continuously cast bloom;
2) continuously cast bloom is heated to 1100 ~ 1300 DEG C, insulation 1h-3h, carry out hot rolling, finishing temperature control at 820 ~ 920 DEG C, and batches at the temperature of 560 ~ 700 DEG C, obtains coils of hot-rolled steel;
3) by cold rolling after coils of hot-rolled steel uncoiling pickling, cold rolling draft controls, at 40%-80%, to obtain cold-rolled steel sheet;
4) cold-rolled steel sheet is produced continuous annealing in line in the continuous annealing of radiation formula heating, jet-propelled cooling, obtain the 440MPa level structural carbon steel of high hardenability value, annealing way is:
Cold-rolled steel sheet is through the heating rate of 1-5 DEG C/s to soaking after the nearly Ovshinsky two-phase region temperature completely of 850-900 DEG C, and soaking time is 100-400s;
Cold-rolled steel sheet is divided into two-step cooling:
First cooling section progressively cools to 580-630 DEG C with the speed of 1-10 DEG C/s;
Second cooling section is cooled to 430-450 DEG C with the speed of 40-50 DEG C/s;
By the overaging of 300-600s, controlling overaging terminal temperature is 350-390 DEG C, and also namely overaging process is band steel Slow cooling process, cooling rate 0.3-0.5 DEG C/s;
150 DEG C are as cold as eventually with 5-20 DEG C/s;
Then watch-quench tank cool to room temperature is entered.
5) carry out smooth acquisition surfaceness, smooth unit elongation is 0.3%-0.5%.
A kind of production method improving 440MPa level structural carbon steel work hardening value provided by the invention, the metallographic microstructure of the 440MPa level structural carbon steel obtained is counted with area fraction: polygonal ferrite 85-95%(comprises most of proeutectoid ferrite and the cold rolling recrystallize ferrite of small part), cementite+granular bainite mixture 5-12% and Ma Ao island 1-2%.
A kind of production method improving 440MPa level structural carbon steel work hardening value provided by the invention, heat based on conventional radiation formula, the continuous annealing of jet-propelled cooling is adopted to produce line, 440MPa structural carbon steel basis is improved annealing process and realizes tissue improvement adjustment, Heating temperature is brought up to nearly complete austenitizing temperature, the proeutectoid ferrite of new transition is obtained as matrix to replace cold rolling recrystallize ferrite at the first cooling section, in alternating temperature overaging after experience second cooling section, except obtaining cementite, also introduce granular bainite Ji Maao island, the hardenability value of the 440MPa level structural carbon steel obtained can reach 0.18-0.20.
Accompanying drawing explanation
The annealing process of production method of the raising 440MPa level structural carbon steel work hardening value that Fig. 1 provides for the embodiment of the present invention and the curve comparison of conventional anneal process.
Fig. 2 is the metallographic microstructure figure of the 440MPa level structural carbon steel that comparative example obtains.
The metallographic microstructure figure of the 440MPa structural carbon steel of the production method acquisition of the raising 440MPa level structural carbon steel work hardening value that Fig. 3 provides for the embodiment of the present invention 1.
Embodiment
A kind of production method improving 440MPa level structural carbon steel work hardening value that the embodiment of the present invention provides, comprises the steps:
1) by percentage to the quality, the chemical composition of steel is: 0.04≤C≤0.08; Si≤0.3; 0.9≤Mn≤1.3; P≤0.015%; S≤0.015%; Alt >=0.015%; N≤0.005%; Surplus is Fe and inevitable impurity, the steel of mentioned component is carried out desulfurization, bessemerizes, RH vacuum refinement, continuous casting obtain continuously cast bloom;
2) continuously cast bloom is heated to 1100 ~ 1300 DEG C, insulation 1h-3h, carry out hot rolling, finishing temperature control at 820 ~ 920 DEG C, and batches at the temperature of 560 ~ 700 DEG C, obtains coils of hot-rolled steel;
3) by cold rolling after coils of hot-rolled steel uncoiling pickling, cold rolling draft controls, at 40%-80%, to obtain cold-rolled steel sheet;
4) cold-rolled steel sheet is produced continuous annealing in line in the continuous annealing of radiation formula heating, jet-propelled cooling, obtain the 440MPa level structural carbon steel of high hardenability value, annealing way is:
Cold-rolled steel sheet is through the heating rate of 1-5 DEG C/s to soaking after the nearly Ovshinsky two-phase region temperature completely of 850-900 DEG C, and soaking time is 100-400s;
Cold-rolled steel sheet is divided into two-step cooling:
First cooling section progressively cools to 580-630 DEG C with the speed of 1-10 DEG C/s;
Second cooling section is cooled to 430-450 DEG C with the speed of 40-50 DEG C/s;
By the overaging of 300-600s, controlling overaging terminal temperature is 350-390 DEG C, and also namely overaging process is band steel Slow cooling process, cooling rate 0.3-0.5 DEG C/s;
150 DEG C are as cold as eventually with 5-20 DEG C/s;
Then watch-quench tank cool to room temperature is entered.
5) carry out smooth acquisition surfaceness, smooth unit elongation is 0.3%-0.5%.
The austenite being heating see Acl in Fig. 1, figure starts transition temperature, and Arl is that the ferrite of cooling starts transition temperature, and Ac is the complete transition temperature of austenite of heating, 3Ms martensite start temperature.As shown by the solid line in the drawings, the annealing way of traditional production 440MPa level structural carbon steel is:
Be heated to soaking after recrystallization zone temperature with the rate of heating of 1-5 DEG C/s, soaking temperature is at 740-770 DEG C, and soaking time is 100-300s;
With 1-4 DEG C/s Slow cooling, Slow cooling end temp is 600-640 DEG C;
430-470 DEG C is cooled fast to 15-25 DEG C/s;
By the overaging of 300-600s, controlling overaging terminal temperature is 400-450 DEG C.
The metallographic microstructure of the 440MPa level structural carbon steel produced by traditional annealing way, has polygonal ferrite and crystal boundary perlite, and the hardenability value producing 440MPa level structural carbon steel is lower.
See Fig. 1, as shown in phantom in FIG., the annealing process feature in a kind of production method improving 440MPa level structural carbon steel work hardening value of providing of the embodiment of the present invention is as follows:
Cold-rolled steel sheet is through the heating rate of 1-5 DEG C/s to soaking after the nearly Ovshinsky two-phase region temperature completely of 850-900 DEG C, and soaking time is 100-400s.Object makes most recrystallize ferrite transformation be austenite;
Steel plate after nearly complete austenitizing is divided into two-step cooling:
First cooling section progressively cools to 580-630 DEG C with the speed of 1-10 DEG C/s, makes austenite fully change pro-eutectoid polygonal ferrite into.
Second cooling section is cooled to 430-450 DEG C with the speed of 40-50 DEG C/s, makes residue not change austenite and remains into overaging section;
By the overaging of 300-600s, controlling overaging terminal temperature is 350-390 DEG C, also namely overaging process is band steel Slow cooling process, and cooling rate 0.3-0.5 DEG C/s, the austenite decomposition that this process does not change is that the mixture, Ma Ao island etc. of cementite and bainite mixes tissue;
150 DEG C are as cold as eventually with 5-20 DEG C/s;
Then watch-quench tank cool to room temperature is entered.
A kind of production method improving 440MPa level structural carbon steel work hardening value provided by the invention, the metallographic microstructure of the 440MPa level structural carbon steel obtained, counts with area fraction: polygonal ferrite 85-95%(comprises most of proeutectoid ferrite and the cold rolling recrystallize ferrite of small part), cementite+granular bainite mixture 5-12% and Ma Ao island 1-2%.Because ferrite matrix majority is second-order phase transition proeutectoid ferrite, therefore have purer matrix, rare carbide particle in crystal grain, is conducive to dislocation and starts in early days.Introduce the bainite Huo Maao island of low-temperature transformation simultaneously in the tissue, obtain these phase times, because expansion mobile dislocation is introduced in phase transformation volumetric expansion in ferrite, can yield tensile ratio be reduced for this reason, improve hardening capacity.
Comparative example
Composition is met: 0.04≤C≤0.08; Si≤0.3; 0.9≤Mn≤1.3; P≤0.015%; S≤0.015%; Alt >=0.015%; N≤0.005%; Surplus is the steel of Fe and inevitable impurity, through desulfurization, bessemerizes, RH vacuum refinement, continuous casting, hot rolling, the technique such as to batch and smelt, wherein, continuous blank heating temperature 1300 DEG C, insulation 3h, finishing temperature 920 DEG C, coiling temperature 680 DEG C, obtains hot-rolled sheet thickness 4.5mm.Then cold rollingly obtain Cold Rolled Plate Thickness 2.0mm, finally traditionally continuous annealing process is annealed to cold-reduced sheet, and the related process parameters of annealing is in table 1.
Table 1
See Fig. 2, the metallographic microstructure of the 440MPa level structural carbon steel that annealing way is traditionally produced is ferrite and pearlite.A large amount of particulate state cementite is there is in ferrite crystal grain.The mechanical property of the 440MPa level structural carbon steel produced is in table 6.
Embodiment 1
Composition is met: 0.04≤C≤0.08; Si≤0.3; 0.9≤Mn≤1.3; P≤0.015%; S≤0.015%; Alt >=0.015%; N≤0.005%; Surplus is the steel of Fe and inevitable impurity, through desulfurization, bessemerizes, RH vacuum refinement, continuous casting, hot rolling, the technique such as to batch and smelt, wherein, continuous blank heating temperature 1300 DEG C, insulation 3h, finishing temperature 920 DEG C, coiling temperature 680 DEG C, obtains hot-rolled sheet thickness 4.5mm.Then cold rollingly Cold Rolled Plate Thickness 2.0mm is obtained.Last cold-rolled steel sheet produces continuous annealing in line in the continuous annealing of radiation formula heating, jet-propelled cooling, and the related process parameters of annealing is in table 2.
Table 2
See Fig. 3, the metallographic microstructure of the 440MPa level structural carbon steel that the embodiment of the present invention obtains is the mixed structure with second-order phase transition polygonal ferrite, cementite, granular bainite Ji Maao island.In its metallograph, in area percent: polygonal ferrite 91.5%%(comprises most of proeutectoid ferrite and the cold rolling recrystallize ferrite of small part), cementite+granular bainite mixture 7% and Ma Ao island 1.5%, in table 5.The mechanical property parameters of the 440MPa level structural carbon steel obtained is in table 6.
Embodiment 2
Composition is met: 0.04≤C≤0.08; Si≤0.3; 0.9≤Mn≤1.3; P≤0.015%; S≤0.015%; Alt >=0.015%; N≤0.005%; Surplus is the steel of Fe and inevitable impurity, through desulfurization, bessemerizes, RH vacuum refinement, continuous casting, hot rolling, the technique such as to batch and smelt, wherein, continuous blank heating temperature 1300 DEG C, insulation 3h, finishing temperature 920 DEG C, coiling temperature 680 DEG C, obtains hot-rolled sheet thickness 4.5mm.Then cold rollingly Cold Rolled Plate Thickness 2.0mm is obtained.Last cold-rolled steel sheet produces continuous annealing in line in the continuous annealing of radiation formula heating, jet-propelled cooling, and the related process parameters of annealing is in table 3.
Table 3
The metallographic microstructure of the 440MPa level structural carbon steel that the embodiment of the present invention obtains is the mixed structure with second-order phase transition polygonal ferrite, cementite, granular bainite Ji Maao island.In its metallograph, the microstructure area occupied percentage ratio on ferrite crystal grain, cementite+granular bainite and island, Ma Ao island is in table 5.The mechanical property parameters of the 440MPa level structural carbon steel obtained is in table 6.
Embodiment 3
Composition is met: 0.04≤C≤0.08; Si≤0.3; 0.9≤Mn≤1.3; P≤0.015%; S≤0.015%; Alt >=0.015%; N≤0.005%; Surplus is the steel of Fe and inevitable impurity, through desulfurization, bessemerizes, RH vacuum refinement, continuous casting, hot rolling, the technique such as to batch and smelt, wherein, continuous blank heating temperature 1300 DEG C, insulation 3h, finishing temperature 920 DEG C, coiling temperature 680 DEG C, obtains hot-rolled sheet thickness 4.5mm.Then cold rollingly Cold Rolled Plate Thickness 2.0mm is obtained.Last cold-rolled steel sheet produces continuous annealing in line in the continuous annealing of radiation formula heating, jet-propelled cooling, and the related process parameters of annealing is in table 4.
Table 4
The metallographic microstructure of the 440MPa level structural carbon steel that the embodiment of the present invention obtains is the mixed structure with second-order phase transition polygonal ferrite, cementite, granular bainite Ji Maao island.In its metallograph, the microstructure area occupied percentage ratio on ferrite crystal grain, cementite+granular bainite and island, Ma Ao island is in table 5.The mechanical property parameters of the 440MPa level structural carbon steel obtained is in table 6.
Table 5
| ? | Ferrite | Cementite+granular bainite | Ma Ao island |
| Embodiment 1 | 91.5% | 7% | 1.5% |
| Embodiment 2 | 90% | 8% | 2% |
| Embodiment 3 | 88% | 11% | 1% |
Table 6
| ? | R p0.2,N/mm 2 | Rm,N/mm2 | A80,% | n10-Ag |
| Comparative example | 332 | 434 | 35 | 0.16 |
| Embodiment 1 | 308 | 465 | 37 | 0.19 |
| Embodiment 2 | 288 | 472 | 36 | 0.20 |
| Embodiment 3 | 267 | 487 | 34 | 0.20 |
As can be seen from Table 5, a kind of production method improving 440MPa level continuous temper graphite element structure iron work hardening value provided by the invention, the metallographic microstructure of the 440MPa level structural carbon steel obtained is the mixed structure with polygonal ferrite, cementite, granular bainite Ji Maao island.This tissue is because the Polygons proeutectoid ferrite of second-order phase transition, and therefore have purer matrix, rare carbide particle in crystal grain, is conducive to dislocation and starts in early days.Introduce the bainite Huo Maao island of low-temperature transformation simultaneously in the tissue, obtain these phase times, because expansion mobile dislocation is introduced in phase transformation volumetric expansion in ferrite, can yield tensile ratio be reduced for this reason, improve hardening capacity.
As can be seen from Table 6, a kind of production method improving 440MPa level structural carbon steel work hardening value that the embodiment of the present invention provides, the 440MPa level structural carbon steel produced has higher hardenability value, can reach 0.18-0.20.The requirement of industrial production steel can be met.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. improve a production method for 440MPa level structural carbon steel work hardening value, it is characterized in that, comprise the steps:
1) by percentage to the quality, the chemical composition of steel is: 0.04≤C≤0.08; Si≤0.3; 0.9≤Mn≤1.3; P≤0.015%; S≤0.015%; Alt >=0.015%; N≤0.005%; Surplus is Fe and inevitable impurity, the steel of described composition is carried out desulfurization, bessemerizes, RH vacuum refinement, continuous casting obtain continuously cast bloom;
2) continuously cast bloom is heated to 1100 ~ 1300 DEG C, insulation 1h-3h, carry out hot rolling, finishing temperature control at 820 ~ 920 DEG C, and batches at the temperature of 560 ~ 700 DEG C, obtains coils of hot-rolled steel;
3) by cold rolling after coils of hot-rolled steel uncoiling pickling, cold rolling draft controls, at 40%-80%, to obtain cold-rolled steel sheet;
4) by cold-rolled steel sheet continuous annealing in the continuous annealing production line of radiation formula heating, jet-propelled cooling, obtain the 440MPa level structural carbon steel of high hardenability value, annealing way is:
Cold-rolled steel sheet is through the heating rate of 1-5 DEG C/s to soaking after the nearly complete austenitizing two-phase region temperature of 850-900 DEG C, and soaking time is 100-400s;
Cold-rolled steel sheet is divided into two-step cooling:
First cooling section progressively cools to 580-630 DEG C with the speed of 1-10 DEG C/s;
Second cooling section is cooled to 430-450 DEG C with the speed of 40-50 DEG C/s;
By the overaging of 300-600s, controlling overaging terminal temperature is 350-390 DEG C, cooling rate 0.3-0.5 DEG C/s;
150 DEG C are as cold as eventually with 5-20 DEG C/s;
Then watch-quench tank cool to room temperature is entered;
5) carry out smooth acquisition surfaceness, smooth unit elongation is 0.3%-0.5%.
2. the production method of raising 440MPa level structural carbon steel work hardening value according to claim 1, it is characterized in that, the metallographic microstructure of described 440MPa level structural carbon steel is counted with area fraction: polygonal ferrite 85-95%, cementite+granular bainite mixture 5-12% and Ma Ao island 1-2%, and the area fraction sum on described polygonal ferrite, cementite+granular bainite mixture and Ma Ao island is 100%.
3. the production method of raising 440MPa level structural carbon steel work hardening value according to claim 1, is characterized in that: the hardenability value of described 440MPa level structural carbon steel can reach 0.18-0.20.
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