CN107723602A - 750MPa levels hot-rolled ferrite-bainite dual-phase steel and its production method - Google Patents
750MPa levels hot-rolled ferrite-bainite dual-phase steel and its production method Download PDFInfo
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- CN107723602A CN107723602A CN201711184325.XA CN201711184325A CN107723602A CN 107723602 A CN107723602 A CN 107723602A CN 201711184325 A CN201711184325 A CN 201711184325A CN 107723602 A CN107723602 A CN 107723602A
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- 750mpa
- steel
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- 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
- 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
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to technical field of metal material, and in particular to a kind of 750MPa levels hot-rolled ferrite-bainite dual-phase steel and its production method.The technical problems to be solved by the invention are to provide a kind of 750MPa levels hot-rolled ferrite-bainite dual-phase steel, by weight percentage, chemical composition C：0.08~0.14%, Si≤0.20%, Mn：1.75~1.20%, Nb：0.045~0.065%, P≤0.015%, S：≤ 0.005%, Als：0.020~0.060%, Ti：0.10~0.15%, remaining is Fe and inevitable impurity.Steel plate of the present invention is organized as ferrite and bainite, wherein ferrite average grain size≤10 μm, and bainite content is 15~35%, and while tensile strength reaches 750MPa high intensity, steel plate has >=24% high-elongation.
Description
Technical field
The invention belongs to technical field of metal material, and in particular to a kind of 750MPa levels hot-rolled ferrite-bainite dual-phase steel
And its production method.The production of other Hi-Stren steels and similar advanced high-strength steel can be also applied simultaneously.
Background technology
By patent document etc., at present, hot-rolled dual-phase steel is broadly divided into that low temperature batches type and medium temperature batches the class of type two.
It is the transformation that main martensitic structure is completed after low temperature batches that low temperature, which batches type hot-rolled dual-phase steel, this kind of hot-rolled dual-phase steel alloy
Content is relatively fewer, and cost of alloy is low, but its control to hot rolling technology window is very strict；Medium temperature batches type hot-rolled dual-phase steel
It is to control coil of strip by stable austenite element such as Cr, Mo etc. to be batched without phase transformation limited proportionality in austenite metastable state, though
Right hot-rolled production process is easily controlled, but because the hot-rolled dual-phase steel cost of alloy is high, and contain higher Si, surface quality with
The reasons such as welding performance difference, it can not be easily accepted by a user.
The quick renewal of progress and rolling equipment recently as technology, material upgrading speed are also adding
It hurry up.Meanwhile energy crisis aggravates and policy requirements energy-saving and emission-reduction and the requirement of automotive light weight technology are constantly deepened, it is Eco-power it is low into
This high-strength steel cry more and more higher.All the time, the production of domestic and international high-strength steel more use scheme be addition Mo, Cr, Ni,
The expensive alloying elements such as Cu, V, cause steel product cost to increase, and patent of the present invention is using microalloying combination technology exploitation 750MPa
Grade high-strength hot-rolled low-carbon bainite dual phase steel, meets the development topic that high-performance is economical, energy-saving.
The content of the invention
The goal of the invention of the present invention gives full play to controlled rolling on the basis of material high intensity and high formability energy is ensured
The process characteristic of cooling is controlled, the addition of the microalloy elements such as Cr, V, Mo, Ni is reduced as far as possible, reaches the purpose for reducing cost.
The technical problems to be solved by the invention are to provide a kind of 750MPa levels hot-rolled ferrite-bainite dual-phase steel, by weight
Measure percentages, chemical composition C：0.08~0.14%, Si≤0.20%, Mn：1.75~1.20%, Nb：0.045~
0.065%, P≤0.015%, S：≤ 0.005%, Als：0.020~0.060%, Ti：0.10~0.15%, remaining be Fe and
Inevitable impurity.
Preferably, above-mentioned 750MPa levels hot-rolled ferrite-bainite dual-phase steel, by weight percentage, chemical composition C：
0.09~0.11%, Si：0.12~0.15%, Mn：1.85~1.90%, Nb：0.050~0.055%, P：≤ 0.009%, S
≤ 0.003%, Als：0.030~0.045%, Ti：0.012~0.013%, remaining is Fe and inevitable impurity.
The technological process of production of 750MPa levels hot-rolled ferrite-bainite dual-phase steel coiled sheet of the present invention is：Desulfurizing iron → turn
Stove smelts top-bottom blowing → dephosphorization, deoxidation, chain-wales are mended and feed Al lines → LF refining electrical heating, secondary alloyed after alloying → stove
→ RH application of vacuum → continuous casting → heating of plate blank → high-pressure water descaling → roughing → Coil Box batches → and finish rolling → section cooling →
Batch → moist closet slow cooling → packaging and storage.
Second technical problem to be solved by this invention is to provide above-mentioned 750MPa levels hot-rolled ferrite-bainite two-phase
The production method of steel.The production method comprises the following steps：It is blast-melted to be made through converter smelting, LF refining, electrical heating, continuous casting
Steel billet, steel billet is heated, roughing, crosses Coil Box, finish rolling, cools down, batching and produce steel plate finished product；Wherein, steel billet 1190~
1250 DEG C of 160~300min of heating；Entry temperature at finishing is 980~1010 DEG C, and finishing temperature is 830~870 DEG C；With 30~60
DEG C/S is cooled to 660~700 DEG C, 9~11s of air cooling, then is cooled to 450~500 DEG C with 10~30 DEG C/sec, batch, then 450
Slow cooling is to room temperature after~500 DEG C of 1~1.5h of insulation.
Preferably, in the production method of above-mentioned 750MPa levels hot-rolled ferrite-bainite dual-phase steel, the roughing using 5~
7 passages, every time deflection >=20% of the first two passage, every time deflection >=25% of remaining passage.
Specifically, in the production method of above-mentioned 750MPa levels hot-rolled ferrite-bainite dual-phase steel, in the roughing gained
Between base thickness be 38~44mm.
Specifically, in the production method of above-mentioned 750MPa levels hot-rolled ferrite-bainite dual-phase steel, the steel plate finished product is
The 1/3~1/8 of workpiece thickness.
The inventive method controls suitable chemical composition, then coordinates control hot-rolled condition, cooling condition etc., is finally obtained
Obtain a kind of 750MPa levels hot rolled ferrite dual phase steel, it is excellent that the dual phase steel has that intensity is high, elongation percentage is high, forming property is good etc.
Point.Steel plate of the present invention is organized as ferrite and bainite, wherein ferrite average grain size≤invention steel plate, bainite content
Between 15-35%.While tensile strength reaches 750MPa high intensity, steel plate has >=24% high-elongation.Up to
In the case of same performance, the inventive method has the advantages of cost is lower.
Embodiment
The present invention the technological process of production be：Desulfurizing iron → converter smelting top-bottom blowing → dephosphorization, deoxidation, alloying →
Chain-wales Argon, which is mended, feeds Al lines → LF refining (electrical heating, secondary alloyed) → RH application of vacuum → continuous casting → heating of plate blank → height
Pressure water de-scaling → roughing → Coil Box batches → finish rolling → section cooling → and batches → moist closet slow cooling → packaging and storage.
The inexpensive 750MPa levels hot-rolled ferrite-bainite dual-phase steel of the present invention, by being obtained after conventional converter smelting, continuous casting
Steel billet, the chemical composition of steel billet are：C：0.08~0.14%, Si≤0.20%, Mn：1.75~1.20%, Nb：0.045~
0.065%, P≤0.015%, S：≤ 0.005%, Als：0.020~0.060%, Ti：0.10~0.15%, remaining be Fe and
Inevitable impurity.It is preferred that steel billet chemical composition is C：0.09~0.11%, Si：0.12~0.15%, Mn：1.85~
1.90%, Nb：0.050~0.055%, P：≤ 0.009%, S≤0.003%, Als：0.030~0.045%, Ti：0.012~
0.013%, remaining is Fe and inevitable impurity.
By heating steel billet obtained by continuous casting to 1190~1250 DEG C of insulation roughing, the temperature had both ensured that slab was fully heated, closes
Gold element is fully dissolved, and prevents the abnormal growth of austenite crystal again；According to the difference of finished product thickness, 200~250mm slabs warp
Cross 5 passage roughing or 7 passage roughing, every time deflection is necessary >=and 20%, ensure austenite recrystallization, refine austenite crystal
Grain, workpiece thickness is at more than 4 times of finished product thickness, to ensure finish rolling total deformation；Different according to finished product thickness, middle base is thick
Degree is different.
Steel billet after roughing then carries out Coil Box and batched, and the Coil Box can be mandrelless transform Coil Box.Institute
State base among realizing in Coil Box to exchange end to end, to ensure that the elongated temperature of steel billet is uniform；Simultaneously remove secondary oxidation iron sheet with
Ensure that steel billet plate face is bright and clean.
Middle base carries out displacement uncoiling after being batched through Coil Box, and finish rolling, entry temperature at finishing are carried out into finish rolling area
For 980~1010 DEG C, finishing temperature scope is 830~870 DEG C, and 3 sections of cooling techniques, cold point two sections of its middle level are used after finish rolling：
The fast quickly cooling of leading portion is cooled to 660~700 DEG C, 9~11s of air cooling with 30~60 DEG C/S, then cold with 10~30 DEG C/sec of cooling velocity
But to 450~500 DEG C, batch, coil of strip or steel plate be placed again into moist closet be incubated at 450~500 DEG C it is slowly cold after 1~1.5h
But to room temperature, finished product storage.
The inventive method coordinates hot continuous rolling process to obtain intensity, plasticity and expansion by ingenious rational composition design
The excellent 750MPa ferrite-bainite two-phase high-strength steel of pore performance.F (ferrite)+B (bayesian is produced using present component
Body) dual phase steel, due to not adding the valuable microalloy element such as Mo, Cr, Ni, in its CCT curve P and B transition curves some
Overlap, while bainite transformation has the feature of the two for the phase transformation that meets of diffusion and shear, this is required in section cooling
There is big cooldown rate early stage, meanwhile, it is incubated when being cooled to 660~700 DEG C, promotes C further to spread, it is follow-up to continue quickly
The curling of bainite transformation section is cooled to, ferrite is obtained and adds bainite structure.
The high intensity of steel plate of the present invention is from four aspects：When solution strengthening, second, tiny ferrite crystal grain, third, iron
Ferritic bainite structure is strengthened, fourth, Ti Second Phase Precipitation is strengthened.Because simple solution strengthening and refined crystalline strengthening can not reach
To 750MPa intensity ranks, so adding appropriate Ti, reach precipitation strength using its Second Phase Precipitation, reach 750MPa levels
Not.The size of ferrite crystal grain must be controlled below 10 μm, and this just needs steel plate to be quickly cooled to 660 after finish to gauge terminates
~700 DEG C, then 9~11s of air cooling, 450~500 DEG C are subsequently quickly cooled to again and is batched, again in 450~500 DEG C of guarantors after batching
1~1.5h of temperature.This can both ensure to obtain tiny ferrite, while can also obtain bainite, reach reinforcing and require.
Common mammoth conveter >=220t of the present invention possesses 2, and Slab Caster possesses 250*1950mm casting machines 2
Bar, common wide steel hot tandem refer to possess 1~4 walking beam heating furnace, 1 stand reversible roughing mill, 7 frame finishing tandem rollings
The hot continuous rolling production line of traditional strip 2050 of unit, 2~3 coiling machines.
Embodiment
Methods described will be illustrated by specific example below, using certain hot-rolling line production of steel plant 2050.Table 1 is this
The chemical composition of inventive embodiments, table 2 are hot rolling technology controlling values, and table 3 is the mechanical property of coil of strip.Using GB/T 228-
2010th, GB/T 232-2010 are detected.
The chemical composition of the embodiment of table 1
The hot rolling technology controlling value of the embodiment of table 2
The mechanical property of the coil of strip of the embodiment of table 3
Claims (6)
1.750MPa level hot-rolled ferrite-bainite dual-phase steel, it is characterised in that：By weight percentage, chemical composition C：
0.08~0.14%, Si≤0.20%, Mn：1.75~1.20%, Nb：0.045~0.065%, P≤0.015%, S：≤
0.005%, Als：0.020~0.060%, Ti：0.10~0.15%, remaining is Fe and inevitable impurity.
2. 750MPa levels hot-rolled ferrite-bainite dual-phase steel according to claim 1, it is characterised in that：Percentage by weight
Than meter, chemical composition C：0.09~0.11%, Si：0.12~0.15%, Mn：1.85~1.90%, Nb：0.050~
0.055%, P：≤ 0.009%, S≤0.003%, Als：0.030~0.045%, Ti：0.012~0.013%, remaining is Fe
With inevitable impurity.
3. the production method of the 750MPa level hot-rolled ferrite-bainite dual-phase steels described in claim 1 or 2, it is characterised in that：
Comprise the following steps：It is blast-melted through converter smelting, LF refining, electrical heating, continuous casting be made steel billet, steel billet is heated, roughing, mistake
Coil Box, finish rolling, cool down, batch and produce steel plate finished product；Wherein, steel billet heats 160~300min at 1190~1250 DEG C；Finish rolling
Inlet temperature is 980~1010 DEG C, and finishing temperature is 830~870 DEG C；660~700 DEG C are cooled to 30~60 DEG C/S, air cooling 9
~11s, then be cooled to 450~500 DEG C with 10~30 DEG C/sec, is batched, then slow cooling is extremely after being incubated 1~1.5h at 450~500 DEG C
Room temperature.
4. the production method of the 750MPa level hot-rolled ferrite-bainite dual-phase steels described in claim 3, it is characterised in that：It is described
Roughing uses 5~7 passages, every time deflection >=20% of the first two passage, every time deflection >=25% of remaining passage.
5. the production method of the 750MPa level hot-rolled ferrite-bainite dual-phase steels described in claim 3, it is characterised in that：It is described
Workpiece thickness obtained by roughing is 38~44mm.
6. the production method of the 750MPa level hot-rolled ferrite-bainite dual-phase steels described in claim 3, it is characterised in that：It is described
Steel plate finished product is the 1/3~1/8 of workpiece thickness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711184325.XA CN107723602A (en) | 2017-11-23 | 2017-11-23 | 750MPa levels hot-rolled ferrite-bainite dual-phase steel and its production method |
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| CN201711184325.XA CN107723602A (en) | 2017-11-23 | 2017-11-23 | 750MPa levels hot-rolled ferrite-bainite dual-phase steel and its production method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108774710A (en) * | 2018-06-01 | 2018-11-09 | 马鞍山钢铁股份有限公司 | A kind of high intensity crane arm support steel and production method thereof |
| CN109536845A (en) * | 2019-02-01 | 2019-03-29 | 本钢板材股份有限公司 | A kind of tensile strength 590MPa grades of wheels hot-rolled ferrite-bainite dual-phase steel steel band and preparation method thereof |
| CN111440984A (en) * | 2020-04-07 | 2020-07-24 | 湖南华菱涟源钢铁有限公司 | Hot rolled steel plate with yield strength of 700MPa and manufacturing method thereof |
| CN111647813A (en) * | 2020-06-01 | 2020-09-11 | 武汉钢铁有限公司 | TMCP process ultrahigh-strength steel with yield strength of more than 800MPa and production method thereof |
| CN114908290A (en) * | 2022-04-27 | 2022-08-16 | 鞍钢股份有限公司 | 520 MPa-grade precipitation strengthening hot-rolled bainite steel and production method thereof |
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| JPH0617125A (en) * | 1992-07-01 | 1994-01-25 | Sumitomo Metal Ind Ltd | Production of hot rolled steel plate for line pipe |
| CN1970813A (en) * | 2006-12-18 | 2007-05-30 | 马鞍山钢铁股份有限公司 | Process for production of hot-rolled dual phase steel by continuous casting and continuous rolling of slab billet |
| CN101974722A (en) * | 2010-10-29 | 2011-02-16 | 河北钢铁股份有限公司唐山分公司 | Steel plate for manufacturing concrete mixer tank and production method |
| CN105925887A (en) * | 2016-06-21 | 2016-09-07 | 宝山钢铁股份有限公司 | 980 MPa-grade hot-rolled ferritic bainite dual-phase steel and manufacturing method thereof |
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2017
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0617125A (en) * | 1992-07-01 | 1994-01-25 | Sumitomo Metal Ind Ltd | Production of hot rolled steel plate for line pipe |
| CN1970813A (en) * | 2006-12-18 | 2007-05-30 | 马鞍山钢铁股份有限公司 | Process for production of hot-rolled dual phase steel by continuous casting and continuous rolling of slab billet |
| CN101974722A (en) * | 2010-10-29 | 2011-02-16 | 河北钢铁股份有限公司唐山分公司 | Steel plate for manufacturing concrete mixer tank and production method |
| CN105925887A (en) * | 2016-06-21 | 2016-09-07 | 宝山钢铁股份有限公司 | 980 MPa-grade hot-rolled ferritic bainite dual-phase steel and manufacturing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108774710A (en) * | 2018-06-01 | 2018-11-09 | 马鞍山钢铁股份有限公司 | A kind of high intensity crane arm support steel and production method thereof |
| CN109536845A (en) * | 2019-02-01 | 2019-03-29 | 本钢板材股份有限公司 | A kind of tensile strength 590MPa grades of wheels hot-rolled ferrite-bainite dual-phase steel steel band and preparation method thereof |
| CN111440984A (en) * | 2020-04-07 | 2020-07-24 | 湖南华菱涟源钢铁有限公司 | Hot rolled steel plate with yield strength of 700MPa and manufacturing method thereof |
| CN111647813A (en) * | 2020-06-01 | 2020-09-11 | 武汉钢铁有限公司 | TMCP process ultrahigh-strength steel with yield strength of more than 800MPa and production method thereof |
| CN111647813B (en) * | 2020-06-01 | 2021-12-17 | 武汉钢铁有限公司 | TMCP process ultrahigh-strength steel with yield strength of more than 800MPa and production method thereof |
| CN114908290A (en) * | 2022-04-27 | 2022-08-16 | 鞍钢股份有限公司 | 520 MPa-grade precipitation strengthening hot-rolled bainite steel and production method thereof |
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