CN108411202A - A kind of think gauge cold-rolled biphase steel and preparation method thereof - Google Patents
A kind of think gauge cold-rolled biphase steel and preparation method thereof Download PDFInfo
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- CN108411202A CN108411202A CN201810289494.8A CN201810289494A CN108411202A CN 108411202 A CN108411202 A CN 108411202A CN 201810289494 A CN201810289494 A CN 201810289494A CN 108411202 A CN108411202 A CN 108411202A
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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
- 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
- C21D8/0236—Cold 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- 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
Abstract
The present invention relates to a kind of think gauge cold-rolled biphase steel, component by weight percentage, C：0.060~0.10%, Si≤0.60%, Mn：1.50~2.00%, P：≤ 0.025%, S≤0.020%, Als：0.015~0.060%, Cr+Mo≤0.60%, surplus are iron and inevitable impurity.The preparation method of this dual phase steel is also provided simultaneously：(steel making working procedure) molten iron pretreatment → converter smelting → external refining → continuous casting → (hot continuous rolling process) heating strand → roughing → finish rolling → control cooling → hot rolling reeling → (cold rolling process) hot rolled coil uncoiling → pickling, cold continuous rolling → batches → and chill volume uncoiling → continuous annealing → smooth.So that final finished is obtained enough martensite according to this process, ensure the final performance of product, better meet the application requirement of car industry, expands application rate of the cold-rolled biphase steel on automobile.
Description
Technical field
The present invention relates to a kind of think gauge cold-rolled biphase steels and preparation method thereof, belong to dual phase steel manufacturing technology field.
Background technology
In the 21st century, Domestic Automotive Industry develops rapidly, and the first in the world big automobile production and marketing state is had become at present, with vapour
The development of vehicle industry, automobile materials are also gradually changing.Dual phase steel is with its low yield strength ratio, high initial manufacture hardening rate, good
The advantages that cooperation of good intensity and ductility, develop into a kind of good high-strength novel Punching Steel of formability, becomes existing
For the important component of automobile steel.
Dual phase steel is the representative products of advanced high-strength steel family, and it is phase transformation strengthening mainly to strengthen means, i.e. martensite is strong
Change, martensite is that steel is heated to certain temperature (formed austenite) to cool down (quenching) by rapid, obtain steel can be made to be hardened,
A kind of quenching structure of enhancing, certain quenching degree and non-will be had by forming the martensite austenite of wanting necessary condition to be a thermally formed
Often fast cooling velocity.
In cold rolled continuous annealing process production think gauge dual phase steel there are unit speed of production is low, rapid cooling cooling velocity is slow
Problem causes to be hardly formed enough martensite in actual production, to which design requirement is not achieved in performance, is badly in need of for this problem
A kind of new process solution, normally produces cold rolling (F+M) two-phase steel product of think gauge (1.8mm-2.5mm), is preferably automobile
The application service of industry
Invention content
In consideration of it, the present invention provides a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge (1.8mm-2.5mm)
Cold rolling (F+M) dual phase steel, component by weight percentage, C：0.060~0.10%, Si≤0.60%, Mn：1.50~
2.00%, P：≤ 0.025%, S≤0.020%, Als：0.015~0.060%, Cr+Mo≤0.60%, surplus are iron and can not
The impurity avoided.
Further, according to weight percent, wherein C：0.060%, Si：0.60%, Mn：1.50%, P：0.025%,
S：0.020%, Als：0.015%, Cr+Mo：0.60%, surplus is iron and inevitable impurity.
Further, according to weight percent, wherein C：0.1%, Si：0.30%, Mn：2.0%, P：0.02%, S：
0.01%, Als：0.06%, Cr+Mo：0.5%, surplus is iron and inevitable impurity.
A kind of preparation method of think gauge cold-rolled biphase steel is additionally provided according to another aspect of the present invention, by following technique
Step carries out：Molten iron pretreatment → converter smelting → external refining → continuous casting → (hot continuous rolling process) heating strand → roughing → essence
Roll → control cooling → hot rolling reeling → (cold rolling process) hot rolled coil uncoiling → pickling, cold continuous rolling → batch → chill volume uncoiling →
Continuous annealing → smooth.
Further, the strand after heating is placed in heating (heating strand), heating temperature 1210 in walking beam furnace
~1270 DEG C；Roughing mill rolling (roughing) is subsequently entered, start rolling temperature is 1020 DEG C~1150 DEG C, intermediate base temperature after roughing >=
950 DEG C, mm finishing mill unit rolling (finish rolling), 830~890 DEG C of finishing temperature are entered back into, then control cooling, (hot rolling is batched after cooling
Batch), 620~680 DEG C of coiling temperature；Uncoiling carries out cold continuous rolling (hot rolled coil uncoiling and cold continuous rolling), the total pushing rate of cold continuous rolling again
>=45%, then chill volume is batched；Chill volume uncoiling again, continuous annealing, 800~850 DEG C of holding temperature；Slow cooling temperature 680~
760 DEG C, 300~340 DEG C of rapid cooling outlet temperature, rapid cooling section cooling rate >=15 DEG C/s, 280~320 DEG C of overaging temperature；It is final flat
It is whole, smooth elongation percentage 0.2~1.0%.
Further, before entering roughing mill rolling, high pressure water dephosphorization operation first is carried out to the strand after coming out of the stove.
Technique effect：Think gauge (1.8mm-2.5mm) cold-rolled biphase steel is very big in the production presence of common continuous annealing unit
Technological difficulties, the mechanism obtained by martensite is it is found that the austenite that is formed of high temperature need to be cold by very quick cooling rate
Martensite could be produced below to Ms points, and there are annealing technology speed in think gauge cold-rolled biphase steel product actual production
Slowly, cooling velocity is low, the heat absorption of think gauge product is not easy cooling problem, cold using think gauge of the present invention (1.8mm-2.5mm)
Dual phase steel and production dual phase steel method are rolled, the above problem is can effectively improve, final finished is made to obtain enough martensite, ensure
The final performance of product better meets the application requirement of car industry, expands application rate of the cold-rolled biphase steel on automobile.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The present invention provides a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge (1.8mm-2.5mm) cold rolling (F+
M) dual phase steel is mainly carried out at three aspects, to solve think gauge cold-rolled biphase steel production technology problem first at setting up separately
Meter, a certain amount of Gr, Mo element is added on the basis of C, Mn steel, to make C curve move to right, effectively improves its quenching degree.
Hot rolling technology is using low temperature finish to gauge (under the premise of ensureing ausrolling), it is ensured that uniformly tiny ferrite is brilliant
Grain.
High temperature coiling technique, the through hardening of austenite when the crystal boundary Mn segregations that high temperature coiling generates can increase annealing cooling
Property, improve the tensile strength of dual phase steel；
It is finally that continuous annealing uses higher annealing temperature (ensuring enough Ovshinsky scale of construction), rapid cooling outlet temperature is appropriate
It improves (ensureing below Ms points, it is therefore an objective to mitigate cooling blower pressure, it is ensured that cooling effect), higher aging temp, ensures
Finished product elongation percentage under the premise of intensity improves is sufficiently large.
Embodiment 1：
The present invention provides a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge (1.8mm-2.5mm) cold rolling (F+
M) dual phase steel, component by weight percentage, C：0.085%, Si≤0.60%, Mn：1.75%, P：≤ 0.025%, S≤
0.020%, Als：0.030%, Cr+Mo≤0.60%, surplus are iron and inevitable impurity.
According to another aspect of the present invention, a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge are additionally provided
The preparation method of (1.8mm-2.5mm) cold rolling (F+M) dual phase steel：It is as follows,
Step 1：It smelts, i.e. molten iron pretreatment → converter smelting → external refining → continuous casting, pours by mild steel method
Strand；
Step 2：Strand is placed in walking beam furnace and is heated, 1250 DEG C of heating temperature；Strand is come out of the stove laggard horizontal high voltage
After water de-scaling, rolled into roughing mill；Intermediate base temperature >=950 DEG C after roughing subsequently enter mm finishing mill unit rolling, finishing temperature
850℃；It is batched after section cooling, 650 DEG C of coiling temperature；Cold continuous rolling total reduction is 50%；Continuous annealing, heating/heat preservation temperature
805 DEG C of degree；720 DEG C of slow cooling temperature, 320 DEG C of rapid cooling outlet temperature, rapid cooling section 15 DEG C/s of cooling rate, 300 DEG C of overaging temperature；It is smooth
Elongation percentage 0.3%.Product yield strength：365MPa, tensile strength 630MPa, elongation after fracture 28.5%.
Embodiment 2：
The present invention provides a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge (1.8mm-2.5mm) cold rolling (F+
M) dual phase steel, component is by weight percentage：C：0.080%, Si≤0.60%, Mn：1.80%, P：≤ 0.025%, S≤
0.020%, Als：0.03%, Cr+Mo≤0.60%, surplus are iron and inevitable impurity.
In the present embodiment, think gauge (1.8mm-2.5mm) cold rolling (F+M) dual phase steel preparation method is as follows：
Step 1：It smelts, i.e. molten iron pretreatment → converter smelting → external refining → continuous casting, pours by mild steel method
Strand；
Step 2：Strand is placed in walking beam furnace and is heated, 1200 DEG C of heating temperature；Strand is come out of the stove laggard horizontal high voltage
After water de-scaling, rolled into roughing mill；Intermediate base temperature >=950 DEG C after roughing subsequently enter mm finishing mill unit rolling, finishing temperature
850 DEG C (this is low temperature finish to gauge, all 900 DEG C or more of general high-temperature final rolling)；It is batched after section cooling, 650 DEG C of coiling temperature；Cold company
It is 50% to roll total reduction；Continuous annealing, 810 DEG C of heating/holding temperature；720 DEG C of slow cooling temperature, 320 DEG C of rapid cooling outlet temperature,
Rapid cooling section 15 DEG C/s of cooling rate, 295 DEG C of overaging temperature；Smooth elongation percentage 0.3%.Product yield strength：360MPa, tensile strength
635MPa, elongation after fracture 29%.
Embodiment 3：
The present invention provides a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge (1.8mm-2.5mm) cold rolling (F+
M) dual phase steel, component by weight percentage, wherein C：0.060%, Si：0.60%, Mn：1.50%, P：0.025%, S：
0.020%, Als：0.015%, Cr+Mo：0.60%, surplus is iron and inevitable impurity.
According to another aspect of the present invention, a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge are additionally provided
The preparation method of (1.8mm-2.5mm) cold rolling (F+M) dual phase steel：It is as follows,
Step 1：It smelts, i.e. molten iron pretreatment → converter smelting → external refining → continuous casting, pours by mild steel method
Strand；
Step 2：Strand is placed in walking beam furnace and is heated, 1250 DEG C of heating temperature；Strand is come out of the stove laggard horizontal high voltage
After water de-scaling, rolled into roughing mill；Intermediate base temperature >=950 DEG C after roughing subsequently enter mm finishing mill unit rolling, finishing temperature
850℃；It is batched after section cooling, 650 DEG C of coiling temperature；Cold continuous rolling total reduction is 50%；Continuous annealing, heating/heat preservation temperature
805 DEG C of degree；720 DEG C of slow cooling temperature, 320 DEG C of rapid cooling outlet temperature, rapid cooling section 15 DEG C/s of cooling rate, 300 DEG C of overaging temperature；It is smooth
Elongation percentage 0.3%.Product yield strength：365MPa, tensile strength 630MPa, elongation after fracture 28.5%.
Embodiment 4：
The present invention provides a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge (1.8mm-2.5mm) cold rolling (F+
M) dual phase steel, component by weight percentage, wherein C：0.1%, Si：0.30%, Mn：2.0%, P：0.02%, S：
0.01%, Als：0.06%, Cr+Mo：0.5%, surplus is iron and inevitable impurity.
According to another aspect of the present invention, a kind of think gauge cold-rolled biphase steel, specially a kind of think gauge are additionally provided
The preparation method of (1.8mm-2.5mm) cold rolling (F+M) dual phase steel：It is as follows,
Step 1：It smelts, i.e. molten iron pretreatment → converter smelting → external refining → continuous casting, pours by mild steel method
Strand；
Step 2：Strand is placed in walking beam furnace and is heated, 1250 DEG C of heating temperature；Strand is come out of the stove laggard horizontal high voltage
After water de-scaling, rolled into roughing mill；Intermediate base temperature >=950 DEG C after roughing subsequently enter mm finishing mill unit rolling, finishing temperature
850℃；It is batched after section cooling, 650 DEG C of coiling temperature；Cold continuous rolling total reduction is 50%；Continuous annealing, heating/heat preservation temperature
805 DEG C of degree；720 DEG C of slow cooling temperature, 320 DEG C of rapid cooling outlet temperature, rapid cooling section 15 DEG C/s of cooling rate, 300 DEG C of overaging temperature；It is smooth
Elongation percentage 0.3%.Product yield strength：365MPa, tensile strength 630MPa, elongation after fracture 28.5%.
According to think gauge (1.8mm-2.5mm) cold-rolled biphase steel production method, final products performance and general thickness specification
Property level is suitable, see the table below.
By comparing can be seen that think gauge (1.8mm-2.5mm) cold rolling (F+M) two-phase steel product, performance inconsistency is smaller,
It is suitable with general thickness specification product performance level.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (6)
1. a kind of think gauge cold-rolled biphase steel, it is characterised in that：Its component by weight percentage, C：0.060~0.10%, Si
≤ 0.60%, Mn：1.50~2.00%, P：≤ 0.025%, S≤0.020%, Als：0.015~0.060%, Cr+Mo≤
0.60%, surplus is iron and inevitable impurity.
2. a kind of think gauge cold-rolled biphase steel as described in claim 1, it is characterised in that：According to weight percent, C：
0.060%, Si：0.60%, Mn：1.50%, P：0.025%, S：0.020%, Als：0.015%, Cr+Mo：0.60%, surplus
For iron and inevitable impurity.
3. a kind of think gauge cold-rolled biphase steel as described in claim 1, it is characterised in that：According to weight percent, C：
0.1%, Si：0.3%, Mn：2.0%, P：0.02%, S：0.01%, Als：0.06%, Cr+Mo：0.50%, surplus be iron and
Inevitable impurity.
4. a kind of preparation method of think gauge cold-rolled biphase steel, it is characterised in that：
It is carried out by following processing step：Molten iron pretreatment → converter smelting → external refining → continuous casting → heating strand → roughing →
Finish rolling → control cooling → hot rolling reeling → hot rolled coil uncoiling → cold continuous rolling → batches, and → chill volume uncoiling → continuous annealing → is flat
It is whole.
5. a kind of preparation method of think gauge cold-rolled biphase steel as claimed in claim 4, it is characterised in that：
Strand is placed in walking beam furnace and heats, 1210~1270 DEG C of heating temperature；Subsequently enter roughing mill rolling, open rolling temperature
Degree is 1020 DEG C~1150 DEG C, and intermediate base temperature >=950 DEG C after roughing enter back into mm finishing mill unit and roll, finishing temperature 830~
890 DEG C, then cooling is controlled, hot rolling reeling after cooling, 620~680 DEG C of coiling temperature；Hot rolling, which is wound off, again carries out cold continuous rolling, cold
Tandem rolling always pushing rate >=45%；Chill volume is batched again；Chill volume uncoiling again, continuous annealing, 800~850 DEG C of holding temperature；It is slow
680~760 DEG C of cold temperature, 300-340 DEG C of rapid cooling outlet temperature, rapid cooling section cooling rate >=15 DEG C/s, overaging temperature 280~320
℃；Final smooth, smooth elongation percentage 0.2~1.0%.
6. a kind of preparation method of think gauge cold-rolled biphase steel as claimed in claim 4, it is characterised in that：Into roughing mill
Before rolling, high pressure water dephosphorization operation first is carried out to the strand after coming out of the stove.
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| CN109161805A (en) * | 2018-10-24 | 2019-01-08 | 包头钢铁（集团）有限责任公司 | A kind of 590MPa grades of automotive light weight technology cold-rolled biphase steel and its production method |
| CN109321825A (en) * | 2018-10-24 | 2019-02-12 | 包头钢铁（集团）有限责任公司 | A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method |
| CN109706377A (en) * | 2019-03-01 | 2019-05-03 | 本钢板材股份有限公司 | A kind of the think gauge PHS1500 steel and its production technology of suitable hot forming processing |
| CN110029269A (en) * | 2019-03-29 | 2019-07-19 | 本钢板材股份有限公司 | A kind of 800MPa grades of low cost tempering dual phase steel and preparation method thereof |
| CN112692061A (en) * | 2020-12-09 | 2021-04-23 | 本钢板材股份有限公司 | Hot rolling method for improving surface quality of steel plate |
| CN116397171A (en) * | 2023-03-27 | 2023-07-07 | 本钢板材股份有限公司 | 590 MPa-grade cold-rolled dual-phase steel for power supply galvanization and production method thereof |
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| CN109321825A (en) * | 2018-10-24 | 2019-02-12 | 包头钢铁（集团）有限责任公司 | A kind of 450MPa grades of automotive light weight technology cold-rolled biphase steel and its production method |
| CN109161805B (en) * | 2018-10-24 | 2020-11-20 | 包头钢铁（集团）有限责任公司 | 590 MPa-grade automobile lightweight cold-rolled dual-phase steel and production method thereof |
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| CN112692061A (en) * | 2020-12-09 | 2021-04-23 | 本钢板材股份有限公司 | Hot rolling method for improving surface quality of steel plate |
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Application publication date: 20180817 |