CN107794453A - A kind of thin strap continuous casting medium managese steel and its manufacture method - Google Patents
A kind of thin strap continuous casting medium managese steel and its manufacture method Download PDFInfo
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- CN107794453A CN107794453A CN201610776326.2A CN201610776326A CN107794453A CN 107794453 A CN107794453 A CN 107794453A CN 201610776326 A CN201610776326 A CN 201610776326A CN 107794453 A CN107794453 A CN 107794453A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Abstract
The invention discloses a kind of thin strap continuous casting medium managese steel, its chemical element mass percent is：C：0.18%~0.4%, Si：0.1%~2.0%, Mn：7%~12%, Al：0.01%~2%, 0 ＜ P≤0.02%, surplus is Fe and other inevitable impurity；In addition its chemical element content also meets：3.9C+11.2Mn+Si 1.9Al 41.4P >=62, C, Si, Mn, Al and P in formula represent the mass percent of respective element respectively.Correspondingly, the invention also discloses the manufacture method of the thin strap continuous casting medium managese steel.Thin strap continuous casting medium managese steel of the present invention is with high intensity, high-elongation and the advantages of with excellent forming property.
Description
Technical field
The present invention relates to a kind of steel and its manufacture method, more particularly to automobile using steel and its manufacture method.
Background technology
Automobile loss of weight is the main path for reducing oil consumption, and reduces the effective countermeasure of waste gas discharge.Meanwhile with collision
Safety standard it is strict year by year, the use of super-high strength steel is widely paid close attention to.But the strong steel of conventional ultra high due to formability not
Foot, using being restricted.Therefore, third generation automobile steel starts the great attention for causing auto industry.
The advanced high-strength steel structure of the first generation is configured to ferrite matrix and adds low temperature phase change product, such as bainite, martensite and
Rich carbon austenitic increases steel grade intensity, and typical steel grade includes dual phase steel (DP steel), transformation induced plasticity steel (TRIP steel), complex phase
Steel (CP steel) and martensite steel.The advanced high-strength steel of the second generation is mainly austenitic steel, main including austenitic stainless steel and twin
Induced plasticity steel (TWIP), this kind of steel show intensity and the plasticity matching of brilliance.But stable fully austenitic structure will
High alloying element content is sought, its cost is consequently increased, and business application is restricted.
Therefore, third generation automobile steel causes broad interest in the world, and enterprise expectations are obtained and will can stabilized
Austenite combine with ultra-fine grained ferrite, bainite or martensite, with the premise of low cost simultaneously improve steel
The intensity of kind and the technical scheme of plasticity.
Third generation automobile steel medium managese steel (Mn-TRIP steel in also referred to as), with traditional phase-change induced plastic (TRIP) steel most
Big difference is that traditional transformation induced plasticity steel (TRIP steel) improves stabilization of austenite, and content using C, Si and Al
For 1.5% or so Mn.The austenite phase ratio obtained using traditional transformation induced plasticity steel (TRIP steel) of above-mentioned element combinations
Example is less, and about 5%~15%, remaining tissue is ferrite (Phase Proportion is 55%~65%) and bainite (Phase Proportion
25%~35%), thus phase-change induced plastic effect (TRIP effects) is relatively weak.However, in order to fully strengthen the phase of steel plate
Become induced plastic effect (TRIP effects), medium managese steel is by adding Mn so that Mn mass percents are 4%~12%, so as to real
Now the Phase Proportion of austenite is more than 20% at room temperature, and then is obtained in deformation process and continue significant phase-change induced plastic effect
(TRIP effects).Here the definition of the middle manganese of medium managese steel is to be different from the design of twinning-induced plasticity steel (TWIP steel) high Mn content
(Mn content >=15% of TWIP steel).
In the prior art in order to solve the problems, such as third generation automobile steel structure property, the method for use：For example, pass through biography
Continuous casting process of uniting realizes (continuous casting → hot rolling → cover annealing → pickling → cold rolling → annealing), or is realized by thin band continuous casting technique
(continuous casting → hot rolling → cover annealing → pickling, no cold rolling and annealing link).Thin band continuous casting technique is outbound by molten steel, quick solidification,
Casting and rolling are combined into one, script can be shortened to 50 meters or so up to the panel production line of nearly km, molten steel is cast
Only needed into steel 25 seconds or so.Due to realizing integrated casting and rolling, the production process of hot strip steel is enormously simplify, makes Steel Production Flow Chart
More compact, production, cost of investment are lower.At present, there is China in the enterprise that the whole world possesses thin strap continuous casting industrialization Showcase Production Line
Baosteel, U.S. knob Ke, Thyssen, nippon and South Korea's Pu item.
But exist in the prior art because the middle manganese composition hot rolling microstructure of medium managese steel is full martensite, martensite is sent out after cold rolling
Change shape, and the crystallite dimension after annealing is generally sub-micron to micron order, is superfine grained structure.And due to Mn diffusion speed
Degree is extremely slow, and even across 96 bell-type annealings more than hour after cold rolling, crystallite dimension is also difficult to occur significantly to grow up, in steel plate
The distinctive yield point elongation of Ultra-fine Grained (yield point elongation phenomenon) can occur in deformation process, glide band occur in piece surface.
In consideration of it, enterprise expectations obtain a kind of automobile steel, its tensile strength can exceed 1180MPa, and elongation percentage exceedes
14%, there is excellent forming property.At the same time, enterprise is adopted it is also expected to the manufacture method of the automobile steel can be obtained
It can make it that technique is simple with the manufacture method, reduce manufacturing cost, the manufactured steel plate produced is in steel plate deformed mistake
(no yield point elongation and Lv Desi deformation) can be continuously surrendered in journey, makes its excellent surface quality, without glide band.
The content of the invention
An object of the present invention is to provide a kind of thin strap continuous casting medium managese steel, and the tensile strength of the medium managese steel exceedes
1180MPa, elongation percentage have excellent forming property more than 14% so that deformation surface of steel plate it is superior in quality, without cunning
Shipper pole.
Based on foregoing invention purpose, the invention provides a kind of thin strap continuous casting medium managese steel, its chemical element mass percent
For：C：0.18%~0.4%, Si：0.1%~2.0%, Mn：7%~12%, Al：0.01%~2%, 0 ＜ P≤0.02%,
Surplus is Fe and other inevitable impurity；In addition its chemical element content also meets：-3.9C+11.2Mn+Si-1.9Al-
41.4P >=62, C, Si, Mn, Al and P in formula represent the mass percent of respective element respectively.That is, C in formula,
The numerical value that Si, Mn, Al and P are substituted into is the numerical value before percentage sign, such as in the embodiment that C content is 0.18%, C in the formula
It is exactly 0.18 to substitute into numerical value.
In technical solutions according to the invention, other inevitable impurity are primarily referred to as sulphur and nitrogen, and its content can be with
Control as S≤0.1%, N≤0.2%.
The design principle of each chemical element of thin strap continuous casting medium managese steel of the present invention is：
Carbon：Carbon has very outstanding solid solution strengthening effect, while carbon still improves as cheap alloying element
The essential element of stabilization of austenite.When the mass percent of carbon is higher than 0.18%, be advantageous to retain one at room temperature
The retained austenite of volume fraction is determined, so as to produce phase-change induced plastic (TRIP) effect.For the technical program, work as carbon
Element mass percent be less than 0.18% when, the intensity of steel is relatively low, at the same austenite content deficiency, easily simultaneously reduce intensity and
Plasticity, and when carbon mass percent is higher than 0.4%, the performance of steel can then deteriorate, the particularly disadvantageous welding in Steel material
Performance.Therefore, carbon mass percent is defined to 0.18%~0.4% in thin strap continuous casting medium managese steel of the present invention.
Silicon：Silicon is the essential elements of deoxidation in steel making.Silicon does not only have certain solution strengthening effect, also has and suppresses carbide
The effect of precipitation.Once silicon mass percent is less than 0.1%, it is difficult to sufficient deoxidation effect is obtained in steel.However, siliceous amount
Percentage can also influence the combination property of steel higher than 2%.In addition, mass percent can also rise in 0.1%~2% element silicon
To the effect for preventing cementite from separating out, so as to improve the stability of austenite in cooling procedure.In consideration of it, of the present invention
The control of silicon mass percent is 0.1%~2% in thin strap continuous casting medium managese steel.
Manganese：Manganese can delay recovery and recrystallization and crystal grain to grow up, refinement microstructure, so as to be set by increasing manganese content
Meter can play Grain Refinement Effect, and the stability of austenite in steel is improved by manganese element enrichment and crystal grain refinement, so that
Phase-change induced plastic effect (TRIP effects) is produced in deformation process.Manganese can also improve martensite in steel by solution strengthening
With ferritic intensity, so as to improve steel strength, reach light-weighted purpose.In addition, manganese also substantially increases quenching for steel
Permeability so that the Critical cooling speed for obtaining martensite is greatly reduced.Therefore, thin strap continuous casting medium managese steel of the present invention manganese matter
Amount percentage is defined to 7%~12%.
Aluminium：Aluminium has deoxidation in steelmaking process, and the addition of aluminium is to improve the degree of purity of molten steel.In addition, aluminium
The nitrogen that can also be fixed in steel, and form stable compound, effective crystal grain thinning with nitrogen.Meanwhile aluminium is added in steel with prevention
Cementite separates out, and promotes the effect of reverse martensitic transformation in steel.Research shows that aluminium can also form aluminum oxide on the surface of steel
Particle and film, the hydrogen atom in environment is hindered to enter, so as to play the tendency for hindering steel that delayed fracture occurs.Therefore, need
The aluminium mass percent of thin strap continuous casting medium managese steel of the present invention is limited to 0.01%~2.0%.
Phosphorus：Phosphorus is non-carbide former, has remarkable result to improving stabilization of austenite.It is but easy when phosphorus content increases
In in cyrystal boundary segregation, there is negative effect to plasticity, toughness and brittle temperature.
In addition, this formula of -3.9C+11.2Mn+Si-1.9Al-41.4P >=62 is also the core technical features of this case.
In the technical program, a large amount of austenites are contained in the microstructure of described thin strap continuous casting medium managese steel, only meet this formula
Alloying element addition just can guarantee that austenite at room temperature has suitable stability, so as to obtain higher tensile strength with
Elongation percentage.The addition of alloying element can influence the stability of austenite, and inventor sends out during long-term research experiment
Existing, it is C, Si, Mn, Al and P that five elements the most significant are influenceed on steel grade austenitizing, and wherein P improves stabilization of austenite
Effect it is the strongest, but in the present invention it is not autotelic addition phosphorus carry out stable austenite；C and Al is also to stabilization of austenite
There is certain effect；Although Mn and Si can improve the stability in austenite cooling procedure, there is reduction difficult to understand in deformation process
The effect of family name's body stability, the effect that wherein Mn reduces to deformed austeaite stability are several times as much as Si.Based on this, inventor
Above-mentioned formula is devised according to lot of experiments, to realize the purpose for improving deformed austeaite stability.
Further, in thin strap continuous casting medium managese steel of the present invention, its chemical element also has 0 ＜ Nb≤0.5%,
0 ＜ V≤1.0%, 0 ＜ Ti≤0.5% at least one.
At least one of alloy element Nb, V and Ti are added, can play a part of crystal grain refinement, and improve
The stability of austenite in steel, so as to improve the microstructure of steel and combination property.The species of above-mentioned alloying element can be with
Addition is designed according to being actually needed.
Further, in thin strap continuous casting medium managese steel of the present invention, its microstructure is martensite+ferrite+Austria
Family name's body.
Further, in thin strap continuous casting medium managese steel of the present invention, the Phase Proportion of austenite is 20-40%.
Further, in thin strap continuous casting medium managese steel of the present invention, ferritic Phase Proportion≤25%.Due to iron element
Body plasticity is less than austenite, therefore excessively a high proportion of ferrite is unfavorable for improving the plasticity of steel grade.
Further, in thin strap continuous casting medium managese steel of the present invention, its crystallite dimension is 5 μm -20 μm.Due to 5 μm-
20 μm of crystal grain can produce processing hardening, avoid the production of local reduction and glide band in the sufficient accumulating dislocation of intra-die
Raw, therefore, the crystallite dimension of thin strap continuous casting medium managese steel of the present invention is limited to 5 μm -20 μm.
Further, in thin strap continuous casting medium managese steel of the present invention, its tensile strength >=1180MPa, and elongation percentage
>=14%.
In thin strap continuous casting medium managese steel of the present invention, its tensile strength is high, and elongation percentage is excellent.Due to evaluating steel
One of plasticity index include elongation percentage, and elongation percentage is bigger, and the plasticity of steel is better, and it can be with before being destroyed by external force
The performance for being subjected to being permanently deformed is better, and therefore, the high-elongation of thin strap continuous casting medium managese steel of the present invention is advantageous to improve
The impact absorption of auto parts and components made of the steel can be with the fracture resistance energy of material under shock loading.
In addition, another object of the present invention is to provide a kind of manufacture using thin strap continuous casting medium managese steel of the present invention
Method, by the quality proportioning of each chemical element of the steel grade of rational design, moved back through technological design, especially thin strap continuous casting and bell-type
The mutual cooperation of fire, obtain high-tensile, high-elongation and the excellent thin strap continuous casting medium managese steel of forming property.
Based on foregoing invention purpose, the invention provides a kind of manufacture using thin strap continuous casting medium managese steel of the present invention
Method, it includes step successively：
(1) smelt；
(2) double roller continuous casting；
(3) a time hot rolling, full martensitic structure is obtained；
(4) bell-type annealing：Annealing temperature is 550~750 DEG C, and the time is not less than 1h, obtains martensite+ferrite+Ovshinsky
The microstructure of body；
(5) pickling.
Thin strap continuous casting includes double roller continuous casting and a time in the manufacture method of thin strap continuous casting medium managese steel of the present invention
Hot rolling.Full martensitic structure is organized as after a time hot rolling, after being heated to two-phase section bell-type annealing, is finally organized as geneva
How much, two-phase sections relevant with the two-phase section heating-up temperature in bell-type annealing temperature of body+austenite+ferrite, wherein martensite
Heating-up temperature is higher, and austenite content is higher, and ferrite content is lower, after the certain temperature limit is reached, is heated with two-phase section
The rise of temperature, austenite content reduce, and martensite content increases.Therefore, thin strap continuous casting medium managese steel of the present invention is most
Whole performance determines by the ratio of martensite, austenite and ferrite three-phase, and thin strap continuous casting medium managese steel of the present invention
Bell-type annealing is defined to：Annealing temperature is 550~750 DEG C, and the time is not less than 1h.Under the conditions of this bell-type annealing, it could obtain
Final structural state is martensite+ferrite+austenite.
At the same time, continuous casting → hot rolling → cover annealing → pickling → cold rolling → annealing compared to existing process produced
Three generations's automobile steel, its crystallite dimension are 200nm~2 μm, and use the manufacturer of thin strap continuous casting medium managese steel of the present invention
The cooperation of method, especially thin strap continuous casting and bell-type annealing, crystal grain can further be grown up, 5 μm -20 μm of large scale can be obtained
Crystal grain.Large-sized crystal grain can produce processing hardening, avoid local reduction and cunning in the sufficient accumulating dislocation of intra-die
The generation of shipper pole.
Further, in the manufacture method of thin strap continuous casting medium managese steel of the present invention, in the step (3), eventually
Temperature is rolled for 750~900 DEG C, and coiling temperature is 500~850 DEG C, is subsequently cooled to room temperature and obtains the full martensitic structure.
Further, in the manufacture method of thin strap continuous casting medium managese steel of the present invention, the step (4) and step
(5) also there is correction step between.
In addition, can also have turn blue step, Tu paint step or zinc-plated step after step (5).
Its advantage of thin strap continuous casting medium managese steel and beneficial effect of the present invention are：
(1) tensile strength >=1180MPa of thin strap continuous casting medium managese steel of the present invention, elongation percentage >=14%.
(2) crystallite dimension in thin strap continuous casting medium managese steel of the present invention is larger, therefore can be abundant in intra-die
Accumulating dislocation, produce processing hardening, avoid the generation of local reduction and glide band so that strip of the present invention connect
Casting medium managese steel has excellent forming property, is advantageous to continuously surrender (no yield point elongation and Lv Desi during steel plate deformed
Deformation) so that deformation surface of steel plate is superior in quality, without glide band.
(3) negligible amounts for the alloy species that thin strap continuous casting medium managese steel of the present invention is added, are ensuring steel
On the premise of microstructure and mechanical property so that technical scheme more economical rationality.
In addition, the manufacture method of thin strap continuous casting medium managese steel of the present invention, it is of the present invention thin available for manufacturing
Band continuous casting medium managese steel, the manufacture method can make up the inhibitory action that high Mn content addition is grown up for crystal grain, improve material
Formability and surface quality of workpieces, and with processing step is simple, production process is few and efficiency high, it is not necessary to by cold rolling and after
Continuous annealing.
Brief description of the drawings
Fig. 1 is the micro-organization chart of the thin strap continuous casting medium managese steel in 2-2 of the embodiment of the present invention.
Fig. 2 is that (XRD refers to that X is penetrated for the XRD spectrum of embodiment of the present invention 2-1,2-2 and the thin strap continuous casting medium managese steel in 2-3
Line diffraction).
Embodiment
Below in conjunction with brief description of the drawings and specific embodiment to thin strap continuous casting medium managese steel of the present invention and its manufacture
Method makes further explanation, but the explanation and illustration does not form improper restriction to technical scheme.
Embodiment and comparative example
The steel plate in thin strap continuous casting medium managese steel and comparative example in above-described embodiment is made using following step：
(1) smelt：Using electric furnace smelting, control the mass percent of each chemical element as shown in table 1；
(2) double roller continuous casting：Molten steel is poured into forms molten interior, warp by two water cooling rotated against crystallization rolls and side seal board
That crosses water cooling crystallization roll is cooled into Cast Strip；
(3) a time hot rolling, full martensitic structure is obtained：Cast Strip in step (2) is passed through by swing guide, pinched
Roller delivers to hot-rolling mill.Finishing temperature is 750~900 DEG C, and coiling temperature is 500~850 DEG C, is subsequently cooled to room temperature, acquisition
Steel plate thickness is 0.5~3mm, and microstructure is full martensitic structure；
(4) bell-type annealing：Annealing temperature is 550~750 DEG C, and the time is not less than 1h, obtains martensite+ferrite+Ovshinsky
The Phase Proportion of the microstructure of body, wherein austenite is 20~40%；
(5) finishing：Bundling can be carried out as desired by finishing, or is improved using 0.1~1.5% smooth reduction ratio
The plate shape of hot rolled plate.The process is optional process, and pickling can also be directly carried out after bell-type annealing；
(6) pickling：Pickling is to remove caused iron scale in a time hot rolling and process of bell type annealing.
In addition, it is necessary to explanation, in other embodiments, in step (1), can also use converter or induction furnace
Smelted.
Furthermore, it is necessary to explanation, in other embodiments, also has turn blue step, Tu paint step after step (6)
Or zinc-plated step.
Table 1 lists the quality hundred of each chemical element of the steel plate in thin strap continuous casting medium managese steel and comparative example in embodiment
Distribution ratio.
Table 1. (wt%, surplus are Fe and the other impurities element in addition to impurity element S and N)
Table 2 lists the specific process parameter of the manufacture method of embodiment and comparative example.
Table 2
| Sequence number | Finishing temperature (DEG C) | Coiling temperature (DEG C) | Annealing temperature (DEG C) | Annealing time (h) |
| Embodiment 1 | 870 | 520 | 650 | 12 |
| Embodiment 2-1 | 890 | 620 | 600 | 24 |
| Embodiment 2-2 | 850 | 600 | 620 | 24 |
| Embodiment 2-3 | 840 | 590 | 640 | 24 |
| Embodiment 2-4 | 860 | 500 | 710 | 6 |
| Embodiment 2-5 | 850 | 550 | 740 | 1 |
| Embodiment 3 | 860 | 570 | 620 | 12 |
| Embodiment 4 | 860 | 650 | 600 | 96 |
| Embodiment 5 | 880 | 650 | 620 | 12 |
| Embodiment 6 | 880 | 700 | 620 | 12 |
| Comparative example 1 | 840 | 550 | 640 | 12 |
| Comparative example 2 | 880 | 570 | 620 | 24 |
It should be noted that embodiment 2-1, embodiment 2-2, embodiment 2-3, embodiment 2-4 and embodiment 2-5 are represented
They employ the percent mass proportioning of the chemical element of the embodiment 2 shown in table 1.
Above-described embodiment and comparative example are sampled, carry out properties test, the correlation performance parameters that experiment is measured
It is listed in Table 3 below.
Table 3 lists the performance parameter of embodiment and comparative example.
Table 3
From table 3 it can be seen that each embodiment of this case yield strength >=680MPa, tensile strength >=1180MPa, prolong
Stretch rate >=14%, illustrate that the intensity of the thin strap continuous casting medium managese steel of embodiment is high, good percentage elongation.
Understood with reference to the content of table 1,2 and table 3, because the mass percent of the carbon in comparative example 1 is less than 0.18%, manganese
Mass percent be less than 7%, therefore, although the finishing temperature limited using the present invention, coiling temperature, annealing temperature and moving back
The fiery time, but do not contain austenite in comparative example 1 but, thus its tensile strength is well below 1180MPa.In comparative example 2
Although the mass percent of carbon meets 0.18-4.0%, but the mass percent of manganese is less than 7%, therefore, although using this hair
Finishing temperature, coiling temperature, annealing temperature and the annealing time of bright restriction, but the tensile strength of comparative example 2 and extension
Rate is less than each embodiment respective performances numerical value.
As can be seen here, technical scheme is based on thin band continuous casting technique, by controlling rational composition design and excellent
The technological parameter of change, especially by the composition design of carbon and manganese element, utilize martensitic traoformation induced plastic effect
(TRIP effects), which is manufactured out, has manganese in high intensity and high-elongation thin strap continuous casting concurrently.Described thin strap continuous casting medium managese steel is used
It on automobile steel, will cause automobile steel that there is excellent strong plasticity to match, be advantageous to improve the impact resistant of automobile structure
Performance, thus significantly lift the security performance of vehicle body.
Fig. 1 shows the microstructure of the thin strap continuous casting medium managese steel in 2-2 of the embodiment of the present invention.
From figure 1 it appears that the microstructure of thin strap continuous casting medium managese steel in embodiment 2-2 for martensite+austenite+
Ferrite, wherein, the Phase Proportion of austenite is 33.7%, and the Phase Proportion of martensite is 44%, and remaining is ferrite, its crystal grain chi
Very little is 5 μm~20 μm.
Fig. 2 is thin in embodiment of the present invention 2-1,2-2 and 2-3 (three curves in corresponding diagram from top to bottom respectively)
XRD spectrum with continuous casting medium managese steel (XRD refers to X-ray diffraction).
The austenite content of each embodiment uses X-ray diffraction measurement (i.e. XRD measurements) in Fig. 2.As shown in Figure 2, one
Determine to improve annealing temperature, corresponding V in scopeγ(i.e. austenite content) also improves therewith, with reference to the content of Fig. 2 and table 3 also
Understand, the Phase Proportion of microstructure can be changed under different annealing temperatures, so as to change its performance parameter, such as surrender is by force
Degree, tensile strength and elongation percentage.
It should be noted that listed above is only specific embodiment of the invention, it is clear that real the invention is not restricted to more than
Example is applied, the similar change for having many therewith.If those skilled in the art directly exported from present disclosure or
All deformations associated, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of thin strap continuous casting medium managese steel, it is characterised in that its chemical element mass percent is：
C：0.18%~0.4%, Si：0.1%~2.0%, Mn：7%~12%, Al：0.01%~2%, 0 ＜ P≤0.02%,
Surplus is Fe and other inevitable impurity；In addition its chemical element content also meets：-3.9C+11.2Mn+Si-1.9Al-
41.4P >=62, C, Si, Mn, Al and P in formula represent the mass percent of respective element respectively.
2. thin strap continuous casting medium managese steel as claimed in claim 1, it is characterised in that its chemical element also have 0 ＜ Nb≤
0.5%, 0 ＜ V≤1.0%, 0 ＜ Ti≤0.5% at least one.
3. thin strap continuous casting medium managese steel as claimed in claim 1, it is characterised in that its microstructure is martensite+ferrite+Austria
Family name's body.
4. thin strap continuous casting medium managese steel as claimed in claim 3, it is characterised in that the Phase Proportion of austenite is 20-40%.
5. thin strap continuous casting medium managese steel as claimed in claim 3, it is characterised in that ferritic Phase Proportion≤25%.
6. thin strap continuous casting medium managese steel as claimed in claim 1, it is characterised in that its crystallite dimension is 5 μm -20 μm.
7. the thin strap continuous casting medium managese steel as described in any one in claim 1-6, it is characterised in that its tensile strength >=
1180MPa, and elongation percentage >=14%.
8. the manufacture method of the thin strap continuous casting medium managese steel as described in any one in claim 1-7, it includes step successively：
(1) smelt；
(2) double roller continuous casting；
(3) a time hot rolling, full martensitic structure is obtained；
(4) bell-type annealing：Annealing temperature is 550~750 DEG C, and the time is not less than 1h, obtains martensite+ferrite+austenite
Microstructure；
(5) pickling.
9. the manufacture method of thin strap continuous casting medium managese steel as claimed in claim 8, it is characterised in that in the step (3), eventually
Temperature is rolled for 750~900 DEG C, and coiling temperature is 500~850 DEG C, is subsequently cooled to room temperature and obtains the full martensitic structure.
10. the manufacture method of thin strap continuous casting medium managese steel as claimed in claim 8, it is characterised in that the step (4) and step
(5) also there is correction step between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610776326.2A CN107794453A (en) | 2016-08-30 | 2016-08-30 | A kind of thin strap continuous casting medium managese steel and its manufacture method |
Applications Claiming Priority (1)
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| CN110066964A (en) * | 2019-04-09 | 2019-07-30 | 东北大学 | A kind of superhigh intensity medium managese steel and its warm-rolling preparation method |
| CN112522571A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Method for producing martensite steel strip by twin-roll thin-strip continuous casting |
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