CN105950984A - Hot rolled duplex-phase steel with tensile strength being 650 MPa grade and production method thereof - Google Patents
Hot rolled duplex-phase steel with tensile strength being 650 MPa grade and production method thereof Download PDFInfo
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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
-
- 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 hot rolled duplex-phase steel with the tensile strength being 650 MPa grade and a production method thereof. The duplex-phase steel is composed of, by weight, 0.06-0.10% of C, less than or equal to 0.3% of Si, 0.90%-1.3% of Mn, less than or equal to 0.025% of P, less than or equal to 0.008% of S, 0.020%-0.070% of Als, 0.01%-0.03% of Nb and the balance Fe and inevitable impurities. The production method of the duplex-phase steel comprises the following steps of (1) converter smelting, (2) argon blowing, final deoxidation of aluminum wires and chemical component adjustment, (3) continuous casting for blank forming and heating of casting blanks, (4) section rolling and (5) a five-section type controlled cooling technique. Structures of steel plates which are made from the duplex-phase steel produced through the method contains bainite, martensite and a certain amount of ferrites, and the better forming performance can be obtained.
Description
Technical field
The present invention relates to a kind of Multiphase Steel, particularly relate to a kind of tensile strength 650MPa level hot rolling
Multiphase Steel and production method thereof.
Background technology
Along with the requirement of energy-saving and emission-reduction and safety improves, use high-strength and super-high strength steel real
The lightweight of existing automobile becomes the major trend of modern automobile industry development.In high strength steel, multiple
Phase steel forms phase with ferrite, bainite and martensite and precipitate, not only has high intensity
With enough formabilities, and there is good Work Hardening Characteristic and good weldability
Energy.Meanwhile, Multiphase Steel has high energy absorption capability and high residual deformation variable, especially
It is suitable for the safety such as part such as side door beams, bumper etc. zero of requirement excellent impact resistance energy
Part.But due to equipment and the restriction of technique, rarely have the report that relevant steel grade produces, generation both at home and abroad
Also only have in boundary that the base of a fruit is gloomy, Pu item and Baosteel minority iron and steel enterprise possess supply conditions.
Chinese patent application " a kind of tensile strength 780MPa grade complex phase steel plate and manufacture method ",
Application number 200510130899.X, discloses a kind of tensile strength 780MPa grade complex phase steel plate and system
Make method, including: chemical composition is by weight percent: 0.13～0.17%C, 0.20～0.40%
Si, 1.30～1.50%Mn, 0.02～0.03%Nb, surplus is Fe；It is organized as granular bayesian
Body and martensite heterogeneous structure, wherein: granular bainite body volume fraction is 90～95%,
Martensite Volume Fraction is 10～5%；Yield strength is 525～550MPa, and tensile strength is
785～795MPa, percentage of total elongation of having no progeny is 20～25%.Rolled by cooling controlling and rolling controlling process,
Control start rolling temperature 1100～1150 DEG C, finishing temperature 800～850 DEG C；Control first paragraph cold
But speed 40～70 DEG C/s, temperature 550～610 DEG C after cooling；Second segment rate of cooling 220～
360 DEG C/s, coiling temperature 20～250 DEG C；Batch after cooling, control steel plate thickness 3～
4.5mm.This manufacture method obtains in steel plate tissue does not has ferritic structure, completely by bainite
And martensite composition, forming property is poor.
Summary of the invention
It is an object of the invention to provide the tensile strength 650MPa level heat that a kind of forming property is good
Roll Multiphase Steel and production method thereof.
For achieving the above object, tensile strength 650MPa level hot rolling complex phase provided by the present invention
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 (acid-soluble aluminum content):
0.020%～0.070%, Nb:0.01%～0.03%, surplus is Fe and inevitable impurity.
Effect to each chemical composition illustrates below.
Carbon: carbon is cheap solution strengthening element.According to the range of application of this steel grade, mainly use
In auto parts and components, need to carry out a certain degree of Pressing Deformation processing, therefore it is required that material exists
While meeting requirement of strength, there is good cold forming performance.If its content is less than
0.06%, then can not meet the requirement of the strength of materials；If its content is more than 0.10%, the most not
The favorable forming property of material can be met.So, its content is limited to 0.06～0.10% model
Enclose.
Silicon: silicon is cheap and effective deoxygenation of liquid steel element, but too much silicone content can deteriorate heat
The surface quality of rolled steel plate, is therefore limited to less than 0.3% for silicone content by its content.
Manganese: manganese is to improve intensity and the maximally effective element of toughness.If its content is less than 0.90%,
Then can not meet strength of materials requirement；But add the manganese of volume, the through hardening increasing steel can be caused
Property, make crack sensitivity increase due to the appearance of welding hardened layer, and increase the alloy of steel
Cost.In consideration of it, 1.3% will be defined on it, so, its content is limited to 1.00～
1.3% scope.
Phosphorus: in order to avoid the welding performance of material, stamping formabilily, toughness, secondary operations
Performance deteriorates, and sets its upper content limit as 0.025%.So its content is controlled
Less than 0.025%.
Sulfur: sulfur content has considerable influence to the cold-bending property of steel, along with the increase of sulfur content, steel
Cold-bending property reduce.Sulfur in steel often exists with the oxide morphology of manganese, and this sulfide presss from both sides
The miscellaneous impact flexibility to steel is the most disadvantageous, and causes the anisotropy of performance, therefore, needs
Sulfur content in steel is controlled the lowest more good.Based on to Steel Sheet technique and manufacturing cost
Consideration, sulfur content in steel is controlled below 0.008%.
Aluminum: aluminum adds for deoxidation, when Als content is less than 0.020%, it is impossible to
Play its effect；On the other hand, aluminium oxide agglomerate, institute are easily formed due to the aluminum of interpolation volume
With, set the Als upper limit as 0.070%.Therefore, Als content 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
Strong carbon, nitrogen compound form element, mainly exist with Nb (C, N) form, resistance in steel
Stop growing up of austenite crystal, finally make ferrite grain size diminish, thinning microstructure.When it
When 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%, can meet the requirement of its intensity and processability, if adding again, cost of alloy
Can significantly rise.So, according to the performance objective requirement of steel grade, its content is limited to 0.01～
0.03% scope.
Except above chemical composition and scope have been made limit in addition to, from improve formability of materials,
From the viewpoint of economy, the present invention is not added with the precious alloys such as Cu, Ti, Ni, Cr, Mo
Element.
Preferably, in described chemical composition, the percentage by weight of Mn is 1.19%～1.29%.
Preferably, in described chemical composition, the percentage by weight of Nb is 0.019%～0.029%.
The production method of above-mentioned tensile strength 650MPa level hot rolling Multiphase Steel, comprises the steps:
1) converter smelting is carried out；
2) carry out Argon at Argon station, add aluminum steel final deoxidizing, and carry out other chemical compositions
Adjustment；
3) being casting continuously to form base and heat strand, slab heating temperature controls at 1250～1300 DEG C,
Heating time inside furnace 160～200min；
4) segmentation rolling is carried out: control roughing end temp, at 1080～1120 DEG C, controls essence
Roll finishing temperature at 800～880 DEG C；
5) five-part form Controlled cooling process is used: first paragraph rate of cooling is 80～180 DEG C/s,
Being cooled to 680～720 DEG C, second segment rate of cooling 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 speed
Degree is 3～8 DEG C/s, is cooled to 380～430 DEG C, and the 5th section of rate of cooling is 30～100 DEG C/s,
It is cooled to 100～250 DEG C；Wherein, first paragraph, the 3rd section, the 5th section of employing water-cooled, the
Two-stage nitration, the 4th section of employing air cooling.
Hereinafter the control principle of each step is illustrated.
About carrying out the control of slab heating temperature and time, be the present invention critical process it
One.The alloying element taking 1250～1300 DEG C of high-temperature heatings to be to ensure that in steel billet is the most molten
Solve, control total time to be to ensure that the complete of alloying element 160～200min in stove heating
Dissolve.
About carrying out segmentation rolling, control roughing end temp is at 1080～1120 DEG C, and controls
Finish rolling finishing temperature is in the critical process that 800～880 DEG C is also the present invention.If it is this is because thick
Roll end temp and be less than 1080 DEG C, then cannot ensure that finish rolling finishing temperature reaches setting value, increase
Big rolling load, increases energy consumption；As higher than 1120 DEG C, then can produce more iron scale,
Affect the surface quality of steel.If finish rolling finishing temperature is less than 800 DEG C, then can be at material
Roll in two-phase region, cause the defects such as mixed crystal, and draught pressure is excessive, exceed equipment energy
Power；As higher than 890 DEG C, then the original austenite grains of steel can be the thickest, reduces steel
Intensity.
About using five-part form Controlled cooling process: first paragraph rate of cooling is 80～180 DEG C/s,
It is cooled to 650～700 DEG C, in order to ensure when the recrystal grain of steel does not has started and grows up
Cool down in time, it is to avoid the generation of thick tissue.Second segment rate of cooling is 3～8 DEG C/s,
It is cooled to 630～680 DEG C, in order to obtain a certain proportion of ferritic structure.Three-stage cooling
Speed is 30～100 DEG C/s, is cooled to 410～450 DEG C, and the 4th section of rate of cooling is 3～8 DEG C
/ s, is cooled to 380～430 DEG C, in order to obtain the bainite structure of vast scale.5th section of cooling
Speed is 30～100 DEG C/s, is cooled to 100～250 DEG C, for making matrix have certain geneva
Soma, meets the requirement of strength that material is higher.
Preferably, step 2) in, argon blowing time is: bottom blowing >=4min, top blast >=5min.
Preferably, step 3) in, control slab heating temperature, at 1280 DEG C～1300 DEG C, is controlled
Time inside furnace 162～188min processed.
Preferably, step 4) in, control roughing end temp at 1090～1100 DEG C.
Preferably, step 4) in, control finish rolling finishing temperature at 840～865 DEG C.
Preferably, step 5) in, first paragraph rate of cooling is 85～110 DEG C/s, and second segment is cold
But speed is 4～5 DEG C/s, and three-stage cooling speed is 35～60 DEG C/s, and the 4th section of rate of cooling is
4～5 DEG C/s, the 5th section of rate of cooling is 35～55 DEG C/s.
Preferably, step 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, the 4th section is cooled to 395～415 DEG C, the
Five sections are cooled to 120～160 DEG C.
The invention has the beneficial effects as follows: the steel plate tissue of the Multiphase Steel produced contains bainite, horse
Family name's body and some ferrites, can obtain more preferable forming property, its lower yield strength
550～700MPa, tensile strength >=650MPa, elongation percentage can reach A80mm>=15%,
180 ° of cross bending test D=1a are qualified, and have good surface quality, can thus make
Cause the auto parts and components that shape complexity, high intensity require.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of the present invention.
Detailed description of the invention
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 level hot rolling Multiphase Steel, by following heavy
The chemical composition of amount percentage ratio is constituted: 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 can not
The impurity avoided.
The production method of above-mentioned Multiphase Steel, its step is as follows:
1) converter smelting is carried out；
2) add aluminum steel final deoxidizing at Argon station, and carry out other composition adjustment, argon blowing time:
Bottom blowing >=4min, top blast >=5min.
3) being casting continuously to form base and heat strand, slab heating temperature controls 1280 DEG C of (temperature
Actual having necessarily is fluctuated, lower same), at stove 160min heat time heating time；
4) segmentation rolling is carried out: control roughing end temp, at 1090 DEG C, controls finish rolling finish to gauge
Temperature is at 800 DEG C；
5) five-part form Controlled cooling process is used: first paragraph rate of cooling is 180 DEG C/s, cooling
To 720 DEG C, second segment rate of cooling is 5 DEG C/s, is cooled to 680 DEG C, three-stage cooling speed
Being 100 DEG C/s, be cooled to 450 DEG C, the 4th section of rate of cooling is 5 DEG C/s, is cooled to 430 DEG C,
5th section of rate of cooling is 100 DEG C/s, is cooled to 170 DEG C.Wherein, first paragraph, the 3rd section,
5th section uses water-cooled, second segment, the 4th section of employing air cooling.
6) batch, control coiling temperature 170 DEG C of (coiling temperature and the 5th section of coolings
Temperature is consistent)；
7) finishing and rear operation are carried out, such as aligning, pickling, cleaning etc..
In the present embodiment, the mechanical properties test result of Multiphase Steel is as shown in table 3, and its lower surrender is strong
Degree ReL: 611MPa, tensile strength Rm: 702MPa, elongation percentage A80mm: 22%, Qu Qiang
Ratio: 0.87,180 ° of cross bending test: d=1a is qualified.
As it is 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 composition.
Embodiment 2～8
The tensile strength 650MPa level hot rolling Multiphase Steel that each embodiment is provided, by institute in table 1
The chemical composition of row percentage by weight constitutes (surplus is Fe and inevitable impurity).It is raw
Product step is substantially the same manner as Example 1, and difference is, each step uses in table 2 listed
Technological parameter.The results are shown in Table 3 for the mechanical properties test of each embodiment gained Multiphase Steel.
The value list of table 1 various embodiments of the present invention
The main technologic parameters list of table 2 various embodiments of the present invention
Table 3 various embodiments of the present invention mechanical properties test the results list
Claims (10)
1. a tensile strength 650MPa level hot rolling Multiphase Steel, it is characterised in that by following
The chemical composition of percentage by weight is constituted:
Surplus is Fe and inevitable impurity.
Tensile strength 650MPa level hot rolling Multiphase Steel the most according to claim 1, its
Being characterised by: in described chemical composition, the percentage by weight of Mn is 1.19%～1.29%.
Tensile strength 650MPa level hot rolling Multiphase Steel the most according to claim 1, its
Being characterised by: in described chemical composition, the percentage by weight of Nb is 0.019%～0.029%.
4. according to the tensile strength 650MPa level hot rolling according to any one of claims 1 to 3
The production method of Multiphase Steel, it is characterised in that comprise the steps:
1) converter smelting is carried out；
2) carry out Argon at Argon station, add aluminum steel final deoxidizing, and carry out other chemical compositions
Adjustment；
3) being casting continuously to form base and heat strand, slab heating temperature controls at 1250～1300 DEG C,
Heating time inside furnace 160～200min；
4) segmentation rolling is carried out: control roughing end temp, at 1080～1120 DEG C, controls essence
Roll finishing temperature at 800～880 DEG C；
5) five-part form Controlled cooling process is used: first paragraph rate of cooling is 80～180 DEG C/s,
Being cooled to 680～720 DEG C, second segment rate of cooling 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 speed
Degree is 3～8 DEG C/s, is cooled to 380～430 DEG C, and the 5th section of rate of cooling is 30～100 DEG C/s,
It is cooled to 100～250 DEG C；Wherein, first paragraph, the 3rd section, the 5th section of employing water-cooled, the
Two-stage nitration, the 4th section of employing air cooling.
The life of tensile strength 650MPa level hot rolling Multiphase Steel the most according to claim 4
Product method, it is characterised in that step 2) in, argon blowing time is: bottom blowing >=4min, top blast
≥5min。
The life of tensile strength 650MPa level hot rolling Multiphase Steel the most according to claim 4
Product method, it is characterised in that: step 3) in, control slab heating temperature at 1280 DEG C
～1300 DEG C, control time inside furnace 162～188min.
The life of tensile strength 650MPa level hot rolling Multiphase Steel the most according to claim 4
Product method, it is characterised in that: step 4) in, control roughing end temp at 1090～1100 DEG C.
The life of tensile strength 650MPa level hot rolling Multiphase Steel the most according to claim 4
Product method, it is characterised in that: step 4) in, control finish rolling finishing temperature at 840～865 DEG C.
The life of tensile strength 650MPa level hot rolling Multiphase Steel the most according to claim 4
Product method, it is characterised in that: step 5) in, first paragraph rate of cooling is 85～110 DEG C/s,
Second segment rate of cooling is 4～5 DEG C/s, and three-stage cooling speed is 35～60 DEG C/s, and the 4th section cold
But speed is 4～5 DEG C/s, and the 5th section of rate of cooling is 35～55 DEG C/s.
The life of tensile strength 650MPa level hot rolling Multiphase Steel the most according to claim 4
Product method, it is characterised in that: step 5) in, first paragraph is cooled to 680～705 DEG C, and second
Section is cooled to 640～655 DEG C, and three-stage cooling to 420～440 DEG C, the 4th section is cooled to
395～415 DEG C, the 5th section is cooled to 120～160 DEG C.
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| CN107557673A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | A kind of high-strength hot rolling acid-cleaning steel plate of high-elongation and its manufacture method |
| CN107557673B (en) * | 2016-06-30 | 2019-03-22 | 鞍钢股份有限公司 | A kind of high-strength hot rolling acid-cleaning steel plate of high-elongation and its manufacturing method |
| CN107267863A (en) * | 2017-06-01 | 2017-10-20 | 舞阳钢铁有限责任公司 | A kind of inexpensive low-carbon-equivalent wind-power tower steel plate and its production method |
| CN107641760A (en) * | 2017-09-26 | 2018-01-30 | 武汉钢铁有限公司 | 460MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of good fatigue behaviour |
| CN107641761A (en) * | 2017-09-26 | 2018-01-30 | 武汉钢铁有限公司 | 500MPa levels have the Hot Rolling Automobile structural steel and iron and manufacture method of good welds performance |
| CN112522616A (en) * | 2020-11-23 | 2021-03-19 | 首钢集团有限公司 | 650 MPa-grade hot-rolled high-strength steel and preparation method and application thereof |
| CN113201691A (en) * | 2021-04-28 | 2021-08-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel plate for 590 MPa-level hydraulic bulging and preparation method thereof |
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