CN105950984B - Tensile strength 650MPa level hot rolling Multiphase Steels and its production method - Google Patents
Tensile strength 650MPa level hot rolling Multiphase Steels and its production method Download PDFInfo
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- CN105950984B CN105950984B CN201610296984.1A CN201610296984A CN105950984B CN 105950984 B CN105950984 B CN 105950984B CN 201610296984 A CN201610296984 A CN 201610296984A CN 105950984 B CN105950984 B CN 105950984B
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
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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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Mechanical Engineering (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of tensile strength 650MPa level hot rolling Multiphase Steels and its production method.The Multiphase Steel is made up of the chemical composition of following percentage by weight：C 0.06%~0.10%, Si≤0.3%, Mn 0.90%~1.3%, P≤0.025%, S≤0.008%, Als 0.020%~0.070%, Nb 0.01%~0.03%, surplus are Fe and inevitable impurity.The production method of the Multiphase Steel, comprises the following steps：1) segmentation rolling converter smelting, 2) Argon, aluminum steel final deoxidizing and chemical composition adjust, 3) be casting continuously to form base and to heating strand, 4) is carried out, 5) use five-part form Controlled cooling process.The steel plate tissue for the Multiphase Steel that this method is produced contains bainite, martensite and certain amount ferrite, can obtain more preferable forming property.
Description
Technical field
The present invention relates to a kind of Multiphase Steel, particularly relates to a kind of tensile strength 650MPa level hot rolling Multiphase Steels and its producer
Method.
Background technology
As energy-saving and emission-reduction and the requirement of security improve, the lightweight of automobile is realized using high-strength and super-high strength steel
As the main trend of modern automobile industry development.In high strength steel, Multiphase Steel is with ferrite, bainite and martensite and analysis
Go out thing composition phase, not only with high intensity and enough formabilities, and with good Work Hardening Characteristic and well
Welding performance.Meanwhile Multiphase Steel has high energy absorption capability and high residual deformation variable, particularly suitable for requiring good
The part of the shock resistance such as breaking piece such as side door beams, bumper.It is but fresh both at home and abroad due to the limitation of equipment and technique
There is the report of related steel grade production, also only have the gloomy base of a fruit, Pu item and Baosteel minority iron and steel enterprise to possess supply conditions in the world.
Chinese patent application " a kind of tensile strength 780MPa grade complex phase steel plates and manufacture method ", application number
200510130899.X a kind of tensile strength 780MPa grade complex phase steel plates and manufacture method are disclosed, including：Chemical composition presses quality
Percentage is：0.13~0.17%C, 0.20~0.40%Si, 1.30~1.50%Mn, 0.02~0.03%Nb, surplus Fe；
Granular bainite and martensite heterogeneous structure are organized as, wherein：Granular bainite body volume fraction is 90~95%, martensite body
Fraction is 10~5%；Yield strength is 525~550MPa, and tensile strength is 785~795MPa, and percentage of total elongation of having no progeny is 20
~25%.Rolled by cooling controlling and rolling controlling process, control 1100~1150 DEG C of start rolling temperature, 800~850 DEG C of finishing temperature；Control
40~70 DEG C/s of first paragraph cooling velocity, 550~610 DEG C of temperature after cooling；220~360 DEG C/s of second segment cooling velocity, is batched
20~250 DEG C of temperature；Batched after cooling, 3~4.5mm of control steel plate thickness.The manufacture method obtains not to be had in steel plate tissue
There is ferritic structure, be made up of completely bainite and martensite, forming property is poor.
The content of the invention
It is an object of the invention to provide a kind of good tensile strength 650MPa level hot rolling Multiphase Steels of forming property and its life
Production method.
To achieve the above object, tensile strength 650MPa levels hot rolling Multiphase Steel provided by the present invention, by following weight hundred
The chemical composition of ratio is divided to form：C：0.06%~0.10%, Si≤0.3%, Mn：0.90%~1.3%, P≤0.025%, S≤
0.008%, Als (acid-soluble aluminum content)：0.020%~0.070%, Nb：0.01%~0.03%, surplus is for Fe and unavoidably
Impurity.
The effect to each chemical composition illustrates below.
Carbon：Carbon is cheap solution strengthening element.According to the application of this steel grade, it is mainly used in auto parts and components, needs
Carry out a certain degree of Pressing Deformation processing, therefore it is required that material is while intensity requirement is met, have it is good it is cold into
Shape performance.If its content is less than 0.06%, the requirement of the strength of materials can not be met；If its content is more than 0.10%,
The favorable forming property of material can not be met.So its content is limited to 0.06~0.10% scope.
Silicon：Silicon is cheap and effective deoxygenation of liquid steel element, but excessive silicone content can deteriorate the surface matter of hot rolled steel plate
Amount, therefore its content is limited to less than 0.3% for silicone content.
Manganese：Manganese is to improve intensity and the maximally effective element of toughness.If its content is less than 0.90%, material can not be met
Intensity requirement；But the manganese of addition volume, the quenching degree for increasing steel can be caused, make crackle quick due to welding the appearance of hardened layer
Perception increases, and increases the cost of alloy of steel.In consideration of it, 1.3% will be defined to thereon, so, its content is limited to
1.00~1.3% scopes.
Phosphorus：In order to avoid the welding performance of material, stamping formabilily, toughness, suitability for secondary processing deteriorate, setting
Its upper content limit is 0.025%.So by the control of its content below 0.025%.
Sulphur：Sulfur content has considerable influence to the cold-bending property of steel, and with the increase of sulfur content, the cold-bending property of steel reduces.
Sulphur in steel often exists with the oxide morphology of manganese, and this sulphide inculsion is very unfavorable to the impact flexibility of steel, and is made
Into the anisotropy of performance, therefore, sulfur content in steel need to be controlled more low better.Based on to Steel Sheet technique and system
This consideration is caused, by sulfur content control in steel below 0.008%.
Aluminium：Aluminium adds for deoxidation, when Als contents are less than 0.020%, it is impossible to play its effect；The opposing party
Face, because the aluminium for adding volume easily forms aluminum oxide agglomerate, so, the Als upper limits are set as 0.070%.Therefore, Als contents
It is limited to 0.020~0.070% scope.
Niobium：Niobium mainly improves the intensity of steel by crystal grain thinning and precipitation hardening, is strong carbon, nitrogen compound
Formation element, mainly exist in steel in the form of Nb (C, N), prevent growing up for austenite crystal, finally make ferrite crystal grain chi
It is very little to diminish, thinning microstructure.When its content is less than 0.01%, it is impossible to meet the requirement of material high intensity；And the niobium added is higher than
When 0.03%, the requirement of its intensity and processability can be met, if adding again, cost of alloy can significantly rise.So according to
The performance objective requirement of steel grade, 0.01~0.03% scope is limited to by its content.
In addition to having made to limit to above chemical composition and scope, go out from the viewpoint of raising formability of materials, economy
Hair, the present invention are not added with the expensive alloying elements such as Cu, Ti, Ni, Cr, Mo.
Preferably, in the chemical composition, Mn percentage by weight is 1.19%~1.29%.
Preferably, in the chemical composition, Nb percentage by weight is 0.019%~0.029%.
The production method of above-mentioned tensile strength 650MPa levels hot rolling Multiphase Steel, comprises the following steps：
1) converter smelting is carried out；
2) Argon is carried out at Argon station, adds aluminum steel final deoxidizing, and carry out the adjustment of other chemical compositions；
3) it is casting continuously to form base and heating strand, slab heating temperature is controlled at 1250~1300 DEG C, heats time inside furnace 160
~200min；
4) segmentation rolling is carried out：Roughing end temp is controlled at 1080~1120 DEG C, control finish rolling finishing temperature 800~
880℃；
5) five-part form Controlled cooling process is used：First paragraph cooling velocity is 80~180 DEG C/s, is cooled to 680~720
DEG C, second segment cooling velocity is 3~8 DEG C/s, is cooled to 630~680 DEG C, and three-stage cooling speed is 30~100 DEG C/s, cooling
To 410~450 DEG C, the 4th section of cooling velocity is 3~8 DEG C/s, is cooled to 380~430 DEG C, the 5th section of cooling velocity be 30~
100 DEG C/s, it is cooled to 100~250 DEG C；Wherein, first paragraph, the 3rd section, the 5th section use water cooling, second segment, the 4th section of use
Air cooling.
The control principle of each step is illustrated below.
It is one of the critical process of the present invention on carrying out slab heating temperature and the control of time.Take 1250~
1300 DEG C of high-temperature heatings be in order to which the alloying element ensured in steel billet is completely dissolved, the control of stove heat total time 160~
200min is to ensure being completely dissolved for alloying element.
On carrying out segmentation rolling, control roughing end temp controls finish rolling finishing temperature to exist at 1080~1120 DEG C
800~880 DEG C and the critical process of the present invention.Because if roughing end temp is less than 1080 DEG C, can not ensure
Finish rolling finishing temperature reaches setting value, increases rolling load, increases energy consumption；Such as it is higher than 1120 DEG C, then can produces more oxidation
Iron sheet, influence the surface quality of steel.If finish rolling finishing temperature is less than 800 DEG C, can be rolled in the two-phase region of material
System, the defects of causing mixed crystal, and draught pressure is excessive, more than capacity of equipment；Such as it is higher than 890 DEG C, then the original austenite of steel
Crystal grain can be excessively thick, reduces the intensity of steel.
On using five-part form Controlled cooling process：First paragraph cooling velocity is 80~180 DEG C/s, is cooled to 650~700
DEG C, cooled down in time when not having started and grow up for the recrystal grain for ensureing in steel, avoid the generation of thick tissue.The
Two-step cooling speed is 3~8 DEG C/s, is cooled to 630~680 DEG C, in order to obtain a certain proportion of ferritic structure.3rd section cold
But speed is 30~100 DEG C/s, is cooled to 410~450 DEG C, the 4th section of cooling velocity is 3~8 DEG C/s, is cooled to 380~430
DEG C, in order to obtain the bainite structure of large scale.5th section of cooling velocity is 30~100 DEG C/s, is cooled to 100~250 DEG C, is
Make matrix that there is certain martensitic structure, meet the higher intensity requirement of material.
Preferably, in step 2), argon blowing time is：Bottom blowing >=4min, top blast >=5min.
Preferably, in step 3), slab heating temperature is controlled at 1280 DEG C~1300 DEG C, control time inside furnace 162~
188min。
Preferably, in step 4), control roughing end temp is at 1090~1100 DEG C.
Preferably, in step 4), control finish rolling finishing temperature is at 840~865 DEG C.
Preferably, in step 5), first paragraph cooling velocity is 85~110 DEG C/s, and second segment cooling velocity is 4~5 DEG C/s,
Three-stage cooling speed is 35~60 DEG C/s, and the 4th section of cooling velocity is 4~5 DEG C/s, the 5th section of cooling velocity be 35~55 DEG C/
s。
Preferably, in step 5), first paragraph is cooled to 680~705 DEG C, and second segment is cooled to 640~655 DEG C, the 3rd section
420~440 DEG C are cooled to, the 4th section is cooled to 395~415 DEG C, and the 5th section is cooled to 120~160 DEG C.
The beneficial effects of the invention are as follows：The steel plate tissue of the Multiphase Steel produced contains bainite, martensite and a fixed number
Ferrite is measured, more preferable forming property can be obtained, 550~700MPa of its lower yield strength, tensile strength >=650MPa, elongation percentage
A can be reached80mm>=15%, 180 ° of cross bending test D=1a are qualified, and have good surface quality, can thus manufacture
Shaping is complicated, the auto parts and components of high intensity requirement.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of the present invention.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
Present embodiments provide a kind of tensile strength 650MPa levels hot rolling Multiphase Steel, by following percentage by weight chemistry into
Divide and form：C：0.060%, Si：0.25%, Mn：1.29%, P：0.025%, S：0.006%, Nb：0.030%, Als：
0.045%, surplus is Fe and inevitable impurity.
The production method of above-mentioned Multiphase Steel, its step are as follows：
1) converter smelting is carried out；
2) aluminum steel final deoxidizing is added at Argon station, and carries out other compositions adjustment, argon blowing time：Bottom blowing >=4min, top blast
≥5min。
3) be casting continuously to form base and to heating strand, slab heating temperature control 1280 DEG C (temperature is actual to have certain fluctuation,
Similarly hereinafter), in stove heat time 160min；
4) segmentation rolling is carried out：Roughing end temp is controlled at 1090 DEG C, control finish rolling finishing temperature is at 800 DEG C；
5) five-part form Controlled cooling process is used：First paragraph cooling velocity is 180 DEG C/s, is cooled to 720 DEG C, second segment is cold
But speed is 5 DEG C/s, is cooled to 680 DEG C, and three-stage cooling speed is 100 DEG C/s, is cooled to 450 DEG C, the 4th section of cooling velocity
For 5 DEG C/s, 430 DEG C are cooled to, the 5th section of cooling velocity is 100 DEG C/s, is cooled to 170 DEG C.Wherein, first paragraph, the 3rd section,
Five sections use water cooling, second segment, the 4th section use air cooling.
6) batched, control coiling temperature is 170 DEG C (coiling temperature is consistent with the 5th section of chilling temperature)；
7) finishing and rear process, such as aligning, pickling, cleaning are carried out.
The mechanical properties test result of Multiphase Steel is as shown in table 3 in the present embodiment, its lower yield strength ReL:611MPa, resist
Tensile strength Rm：702MPa, elongation percentage A80mm：22%, yield tensile ratio：0.87,180 ° of cross bending test：D=1a is qualified.
As shown in figure 1, be the metallographic structure figure of Multiphase Steel in the present embodiment, mainly by bainite, ferrite and a small amount of
Martensitic structure forms.
Embodiment 2~8
The tensile strength 650MPa level hot rolling Multiphase Steels that each embodiment is provided, by the change of listed percentage by weight in table 1
Study a point composition (surplus is Fe and inevitable impurity).Its production stage is substantially the same manner as Example 1, and difference exists
In each step uses listed technological parameter in table 2.The results are shown in Table 3 for the mechanical properties test of Multiphase Steel obtained by each embodiment.
The comparative example of the various embodiments of the present invention of table 1
The main technologic parameters list of the various embodiments of the present invention of table 2
The various embodiments of the present invention mechanical properties test the results list of table 3
Claims (10)
1. a kind of tensile strength 650MPa levels hot rolling Multiphase Steel, it is characterised in that by the chemical composition structure of following percentage by weight
Into：
Surplus is Fe and inevitable impurity；
Its production method, comprises the following steps：
1) converter smelting is carried out；
2) Argon is carried out at Argon station, adds aluminum steel final deoxidizing, and carry out the adjustment of other chemical compositions；
3) it is casting continuously to form base and heating strand, slab heating temperature is controlled at 1250~1300 DEG C, heating time inside furnace 160~
200min；
4) segmentation rolling is carried out：Roughing end temp is controlled at 1080~1120 DEG C, control finish rolling finishing temperature is 800~880
℃；
5) five-part form Controlled cooling process is used：First paragraph cooling velocity is 80~180 DEG C/s, is cooled to 680~720 DEG C,
Two-step cooling speed is 3~8 DEG C/s, is cooled to 630~680 DEG C, three-stage cooling speed is 30~100 DEG C/s, is cooled to 410
~450 DEG C, the 4th section of cooling velocity is 3~8 DEG C/s, is cooled to 380~430 DEG C, the 5th section of cooling velocity be 30~100 DEG C/
S, it is cooled to 100~250 DEG C；Wherein, first paragraph, the 3rd section, the 5th section use water cooling, second segment, the 4th section use air cooling.
2. tensile strength 650MPa levels hot rolling Multiphase Steel according to claim 1, it is characterised in that：The chemical composition
In, Mn percentage by weight is 1.19%~1.29%.
3. tensile strength 650MPa levels hot rolling Multiphase Steel according to claim 1, it is characterised in that：The chemical composition
In, Nb percentage by weight is 0.019%~0.029%.
4. according to the production method of tensile strength 650MPa levels hot rolling Multiphase Steel according to any one of claims 1 to 3, it is special
Sign is, comprises the following steps：
1) converter smelting is carried out；
2) Argon is carried out at Argon station, adds aluminum steel final deoxidizing, and carry out the adjustment of other chemical compositions；
3) it is casting continuously to form base and heating strand, slab heating temperature is controlled at 1250~1300 DEG C, heating time inside furnace 160~
200min；
4) segmentation rolling is carried out：Roughing end temp is controlled at 1080~1120 DEG C, control finish rolling finishing temperature is 800~880
℃；
5) five-part form Controlled cooling process is used：First paragraph cooling velocity is 80~180 DEG C/s, is cooled to 680~720 DEG C,
Two-step cooling speed is 3~8 DEG C/s, is cooled to 630~680 DEG C, three-stage cooling speed is 30~100 DEG C/s, is cooled to 410
~450 DEG C, the 4th section of cooling velocity is 3~8 DEG C/s, is cooled to 380~430 DEG C, the 5th section of cooling velocity be 30~100 DEG C/
S, it is cooled to 100~250 DEG C；Wherein, first paragraph, the 3rd section, the 5th section use water cooling, second segment, the 4th section use air cooling.
5. the production method of tensile strength 650MPa levels hot rolling Multiphase Steel according to claim 4, it is characterised in that step
2) in, argon blowing time is：Bottom blowing >=4min, top blast >=5min.
6. the production method of tensile strength 650MPa levels hot rolling Multiphase Steel according to claim 4, it is characterised in that：Step
3) in, control slab heating temperature controls 162~188min of time inside furnace at 1280 DEG C~1300 DEG C.
7. the production method of tensile strength 650MPa levels hot rolling Multiphase Steel according to claim 4, it is characterised in that：Step
4) in, control roughing end temp is at 1090~1100 DEG C.
8. the production method of tensile strength 650MPa levels hot rolling Multiphase Steel according to claim 4, it is characterised in that：Step
4) in, control finish rolling finishing temperature is at 840~865 DEG C.
9. the production method of tensile strength 650MPa levels hot rolling Multiphase Steel according to claim 4, it is characterised in that：Step
5) in, first paragraph cooling velocity is 85~110 DEG C/s, and second segment cooling velocity is 4~5 DEG C/s, and three-stage cooling speed is 35
~60 DEG C/s, the 4th section of cooling velocity is 4~5 DEG C/s, and the 5th section of cooling velocity is 35~55 DEG C/s.
10. the production method of tensile strength 650MPa levels hot rolling Multiphase Steel according to claim 4, it is characterised in that：Step
It is rapid 5) in, first paragraph is cooled to 680~705 DEG C, and second segment is cooled to 640~655 DEG C, three-stage cooling to 420~440 DEG C,
4th section is cooled to 395~415 DEG C, and the 5th section is cooled to 120~160 DEG C.
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| CN112522616B (en) * | 2020-11-23 | 2022-03-22 | 首钢集团有限公司 | 650 MPa-grade hot-rolled high-strength steel and preparation method and application thereof |
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| CN104451402A (en) * | 2014-12-19 | 2015-03-25 | 山东钢铁股份有限公司 | 700MPa-grade hot-rolled dual-phase steel and manufacturing method thereof |
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