CN104060164B - A kind of hot rolled steel plate for cold formation and manufacture method thereof - Google Patents
A kind of hot rolled steel plate for cold formation and manufacture method thereof Download PDFInfo
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Abstract
The invention discloses a kind of hot rolled steel plate for cold formation and manufacture method thereof, the preparation method of this hot rolled steel plate for cold formation includes making steel step, continuous casting step, heating steps, hot continuous rolling step and batching step, it is characterized in that, molten steel composition after described steel-making is: the C of 0.05 0.1 weight %, the Si of≤0.1 weight %, the Mn of 1.7 1.95 weight %, the Nb of 0.03 0.07 weight %, the Ti of 0.09 0.14 weight %, the Mo of 0.1 0.3 weight %, the P of≤0.025 weight %, the S of≤0.01 weight %, surplus is Fe and inevitable impurity；Finish rolling finishing temperature in described hot continuous rolling step is 850 900 DEG C；The described coiling temperature batched in step is 530 580 DEG C.The method according to the invention, using the teaching of the invention it is possible to provide a kind of yield strength 750MPa level cold formability high tensile hot rolled steel sheet.
Description
Technical field
The present invention relates to a kind of hot rolled steel plate for cold formation and manufacture method thereof, bend in particular it relates to a kind of
Take intensity 750MPa level cold formability high tensile hot rolled steel sheet and preparation method thereof.
Background technology
In order to avoid the thermoforming process impact on hot rolled steel plate material softening problem, in actual applications,
The hot rolled steel plate less to thickness of slab, it is a kind of economical and practical for using cooling formation technic to carry out the processing of clod wash part
Method, therefore, hot continuous rolling steel plate for cold forming has obtained the biggest development, hot continuous rolling steel plate for cold forming
It is widely used in the fields such as automobile, engineering machinery, steel construction, building.
The hot rolled steel plate yield strength that cooling formation technic uses at first is within 400MPa, along with each row is each
The development of industry, in order to reduce production cost and improve component safety, the steel grade of this intensity rank is
The requirement of user can not be met, need to use the hot rolled steel plate for cold formation of higher height level, at vapour
Car field, in order to alleviate vehicle weight, reduction oil consumption, raising automobile component intensity, guarantee security performance
Deng, the intensity rank of automotive frame hot rolled steel plate has been increased to more than yield strength 650MPa；With
The increase depth of building and the raising that security performance is required, cold-formed hot continuous rolled steel plate for building
Rank also brings up to 420MPa even 460MPa from 345MPa.
Dong Feng Auto Corporation's one full year of life China etc. to SSAB company of Sweden produce Domex 700MC hot-rolled steel
Plate is analyzed, its chemical composition require for the C of≤0.12 weight %, the Mn of≤2.1 weight %,
The Nb of≤0.07 weight %, the Ti of≤0.1 weight %, the Mo of≤0.5 weight %, typical case's finished steel plate
Mechanical property be Rel=735MPa, Rm=820MPa, A=16%, Domex 700MC contains
Mo noble element, production cost is higher, and the elongation percentage of Domex 700MC hot rolled steel plate is relatively low；
University of Science & Technology, Beijing Zhang Fengquan etc. discusses Japan in the current situation and development article of Low Alloy Steel for Automobile
The TS780 hot rolled steel plate of Kawasaki company exploitation, its chemical composition is the C of 0.08 weight %, 1.5 weight
The Si of %, the Mn of 1.8 weight %, the Ti of 0.1 weight %, finished steel plate mechanical property is Rm >=800MPa,
A >=20%, utilizes titanium precipitation strength and the ferrite+martensite heterogeneous structure of ferritic phase, reaches
Well combination property, but produce the finishing temperature of this kind of steel plate and coiling temperature is low, producting process difficulty
Bigger；Anshan iron and steel plant share technique center Chen Yan etc. are at the research and development of products strategy article pair of JFE iron company of Japan
NKK exploitation NANO-HITEN steel studied, chemical composition be the C of 0.2 weight %, 1.46
The Si of weight %, the Mn of 1.45 weight %, mechanical property is Rel=670MPa, Rm=830MPa,
The finishing temperature of A=39%, NANO-HITEN steel plate is 800 DEG C, and coiling temperature is 380 DEG C, low
Carbon level and interpolation molybdenum avoid the generation of pearlite, but finishing temperature and coiling temperature are low, production technology
Difficulty is bigger；The a kind of of invention such as China of Jiao state of Hunan Hualing Lianyuan Iron And Steel Co., Ltd produce yield strength
The method of 700MPa level high-strength steel, its chemical composition content is the C of 0.03-0.08 weight %, 0.2-0.5
Ti, 0.02-0.08 weight % of Mn, 0.1-0.15 weight % of the Si of weight %, 1.4-2 weight %
The V of Nb, 0-0.03 weight %, uses continuous casting and rolling technique of sheet bar, and finishing temperature is 820-880 DEG C,
After section cooling, coiling temperature is 550-620 DEG C, and the yield strength scope of product is 690-760MPa,
Coiling temperature is relatively low, and producting process difficulty is bigger；The new equality of Zhujiang Iron and Steel Co Ltd, Guangzhou's hair is sent out
Bright a kind of 700MPa grade composite strengthening bainite steel and preparation method thereof uses CSP work
Skill, its chemical composition content is the C of 0.03-0.07 weight %, the Mn of 1.51-2.1 weight %, 0.5-0.8
The Ti of the Cr of weight %, 0.1-0.15 weight %, the tissue of steel is surrendered based on tiny bainite, product
Intensity can reach more than 700MPa, and containing Cr in this steel plate, and Ti content is higher, production cost
Higher, coiling temperature is low, and producting process difficulty is bigger.
Visible, the commonly used interpolation of production technology route of high tensile hot rolled steel sheet more than 700MPa level
The microalloying route of the noble elements such as chromium, niobium, molybdenum and vanadium, the molybdenum content of part steel grade is even up to 0.5
Weight %Mo, chromium content reaches 0.5-0.8 weight %Cr.It addition, portioned product uses sheet blank continuous casting
Continuous rolling process, low finishing temperature (such as 800 DEG C), low coiling temperature (such as 380 DEG C) and routine are cold
But technique, makes to introduce in finished product tissue bainite or martensite strengthening, and producting process difficulty is bigger.Meanwhile,
The Si content of all steel grades all more than 0.1 weight %, the hot rolled steel plate for cold formation conduct of this composition
The delivery of hot rolling commodity is no problem, but silicone content more than 0.1 weight % will reduce the attachment of coating
Power, affects the quality of coating, and the steel billet of the most this silicone content cannot function as the raw material of cold rolling coated article,
So, hot-rolled product and cold-rolled products will use the raw material of different chemical composition, cause steel mill's steel grade board
More than number, bring the biggest difficulty to the organization of production arrangement smelted with in continuous casting, be unfavorable for the profit in slab storehouse
By rate and hot delivery and hot charging rate, it is impossible to carry out Flexible Production.
Summary of the invention
The invention aims to overcome yield strength 750MPa level cold formability in prior art high-strength
The defect that degree hot rolled steel plate production cost is higher and producting process difficulty is bigger, it is provided that a kind of new surrender is strong
Degree 750MPa level cold formability high tensile hot rolled steel sheet and manufacture method thereof.
The present inventor has been surprisingly found that under study for action, uses niobium, titanium, manganese, molybdenum microalloying mode,
And make each component control in suitable content range, and use the high finish rolling finish to gauge temperature of 850-900 DEG C
Degree and the high coiling temperature of 535-580 DEG C, can make the cold formability high tensile hot rolled steel sheet produced
There is high-intensity high-tenacity, without adding the noble elements such as Cr and V, and high finish rolling finish to gauge temperature
Degree and high coiling temperature make controlling of production process simple, it addition, by the silicon composition using low content,
So that steel billet can not only be used for the raw material of hot continuous rolling steel plate for cold forming, again can be as cold-rolled steel sheet and cold rolling
The raw material of clad steel sheet, it is possible to the composition of hot-rolled product and cold-rolled products is united, reduce steel grade it
Between mixed water, beneficially the utilization rate in slab storehouse and the hot delivery and hot charging of steel billet, be advantageously implemented flexible metaplasia
Produce, reduce the difficulty of steel mill's organization of production, improve the production efficiency of steel mill.
Therefore, to achieve these goals, on the one hand, the invention provides a kind of cold formability hot-rolled steel
The manufacture method of plate, the method include make steel step, continuous casting step, heating steps, hot continuous rolling step and
Batching step, wherein, the molten steel composition after described steel-making is: the C of 0.05-0.1 weight % ,≤0.1 weight
Nb, 0.09-0.14 weight % of Mn, 0.03-0.07 weight % of Si, 1.7-1.95 weight % of amount %
The Mo of Ti, 0.1-0.3 weight %, the P of≤0.025 weight %, the S of≤0.01 weight %, surplus
For Fe and inevitable impurity；Finish rolling finishing temperature in described hot continuous rolling step is 850-900 DEG C；
The described coiling temperature batched in step is 535-580 DEG C.
Under preferable case, the molten steel composition after described steel-making is: the C of 0.05-0.08 weight % ,≤0.05
Nb, the 0.1-0.125 weight of Mn, 0.045-0.06 weight % of the Si of weight %, 1.8-1.95 weight %
The Mo of the Ti of %, 0.15-0.25 weight %, the P of≤0.025 weight %, the S of≤0.01 weight %, remaining
Amount is Fe and inevitable impurity.
Preferably, the finish rolling finishing temperature in described hot continuous rolling step is 870-895 DEG C；Described batch step
Coiling temperature in Zhou is 540-575 DEG C.
Preferably, it is cooled to coiling temperature with the cooling rate of 10-30 DEG C/s after finish rolling.
On the other hand, the invention provides a kind of hot rolled steel plate for cold formation prepared by said method.
The present invention uses niobium, titanium, manganese, molybdenum microalloying mode, controls the molten steel composition after steel-making and is:
The C of 0.05-0.1 weight %, Mn, the 0.03-0.07 weight of the Si of≤0.1 weight %, 1.7-1.95 weight %
Mo, the P of≤0.025 weight % of Ti, 0.1-0.3 weight % of Nb, 0.09-0.14 weight % of amount %,
The S of≤0.01 weight %, surplus is Fe and inevitable impurity.Avoid addition Cr and V etc. expensive
Heavy element, reduces production cost；Use high-temperature final rolling, high temperature coiling simultaneously and quickly cool down technique system
Degree, successfully produces the yield strength 750MPa level cold formability high-strength hot based on acicular ferrite
Rolled steel plate, rolling mill practice controls simple, strong adaptability；Further, the cold formability that the inventive method manufactures
High tensile hot rolled steel sheet mechanical property meets the requirement of cold formability high tensile hot rolled steel sheet.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Hereinafter the detailed description of the invention of the present invention is described in detail.It should be appreciated that this place is retouched
The detailed description of the invention stated is merely to illustrate and explains the present invention, is not limited to the present invention.
The invention provides the manufacture method of a kind of hot rolled steel plate for cold formation, the method includes steel-making step
Suddenly, continuous casting step, heating steps, hot continuous rolling step and batch step, wherein, the steel after described steel-making
Water constituent is: the C of 0.05-0.1 weight %, the Mn of the Si of≤0.1 weight %, 1.7-1.95 weight %,
The Mo of Ti, 0.1-0.3 weight % of the Nb of 0.03-0.07 weight %, 0.09-0.14 weight % ,≤0.025
The P of weight %, the S of≤0.01 weight %, surplus is Fe and inevitable impurity；Described hot continuous rolling
Finish rolling finishing temperature in step is 850-900 DEG C；The described coiling temperature that batches in step is
535-580℃。
According to the present invention, as long as making the molten steel composition after steel-making be: the C of 0.05-0.1 weight % ,≤0.1
Nb, 0.09-0.14 weight % of Mn, 0.03-0.07 weight % of the Si of weight %, 1.7-1.95 weight %
The Mo of Ti, 0.1-0.3 weight %, the P of≤0.025 weight %, the S of≤0.01 weight %, surplus
For Fe and inevitable impurity；Finish rolling finishing temperature in described hot continuous rolling step is 850-900 DEG C；
The described coiling temperature batched in step is 535-580 DEG C, can realize the purpose of the present invention, i.e. reduce
Production cost, rolling mill practice controls simple, and the hot rolled steel plate for cold formation produced meets cold formability
The requirement of high tensile hot rolled steel sheet.But under preferable case, the molten steel composition after steel-making is: 0.0.05-0.08
The C of weight %, Mn, 0.045-0.06 weight % of the Si of≤0.05 weight %, 1.8-1.95 weight %
The Mo of the Ti of Nb, 0.1-0.125 weight %, 0.15-0.25 weight %, the P of≤0.025 weight % ,≤0.01
The S of weight %, surplus is Fe and inevitable impurity, can further improve the cold formability produced
The intensity of high tensile hot rolled steel sheet and toughness.
Additionally, in order to improve the intensity of the cold formability high tensile hot rolled steel sheet produced and tough further
Property, the finish rolling finishing temperature in the most described hot continuous rolling step is 870-895 DEG C, more preferably
875-895℃；Batch the coiling temperature in step described in preferably and be 540-575 DEG C；More preferably
545-570℃。
In the present invention, for steel-making step without particular/special requirement, process for making commonly used in the art can be used,
Such as, through desulfurizing iron, converter smelting, LF stove Ca process, by molten steel composition control it is: 0.05-0.1
The C of weight %, Mn, 0.03-0.07 weight % of the Si of≤0.1 weight %, 1.7-1.95 weight %
The Mo of the Ti of Nb, 0.09-0.14 weight %, 0.1-0.3 weight %, the P of≤0.025 weight % ,≤0.01
The S of weight %, surplus is Fe and inevitable impurity.
Continuous casting process commonly used in the art can also be used for continuous casting step, such as, use overall argon
Sealing casting, molten steel injects tundish by the slide gate nozzle of ladle bottom, and tundish temperature is wanted without special
Ask, the temperature used for this area routine, for example, 1530-1560 DEG C, use funnel-type crystallizer,
Casting speed without particular/special requirement, the Casting speed used for this area routine, for example, 0.7-0.9m/min,
The continuous casting steel billet thickness that continuous casting step obtains is preferably 200-250mm.
In the present invention, heating steps preferably makes strand at 1230-1265 DEG C (preferably 1240-1260 DEG C)
At a temperature of heat (heating includes preheating section, soaking zone etc.), described strand heating can be in various routines
For strand heating device on carry out, for strand heating device can be such as stepped heating
Stove.
In the present invention, hot continuous rolling step is that the strand after making heating removes shape on surface through high-pressure water descaling
After the iron scale become, entering reversible roughing mills, through 5-7 passes, every time deflection is not
It is preferably 21-36% less than 20%(), after roughing, the thickness of intermediate blank is 40-60mm, with laggard
Entering Coil Box, make band steel toe, tail exchange, then carry out finish rolling, after finish rolling, the thickness of steel plate is preferably
5-10mm.The outlet temperature of roughing, without particular/special requirement, can use temperature commonly used in the art, such as
Roughing outlet temperature is 1030-1080 DEG C, preferably 1050-1070 DEG C.Finish rolling start rolling temperature is preferably
950-1000 DEG C, preferably 975-1000 DEG C；It addition, as it has been described above, finish rolling finishing temperature is 850-900 DEG C；
It is preferably 870-895 DEG C；More preferably 875-895 DEG C.
In the present invention, batching step is the step that coiled sheet batches rolling after supercooling through coiling machine.For
The mode of cooling is preferably the mode of section cooling, and section cooling is preferably the cooling speed with 10-30 DEG C/s
Degree is cooled to coiling temperature from finish rolling finishing temperature, is more preferably the rate of cooling with 15-26 DEG C/s from essence
Roll finishing temperature and be cooled to coiling temperature.Coiling temperature is 535-580 DEG C, preferably 540-575 DEG C；More
Preferably 545-570 DEG C.
Present invention also offers a kind of cold formability high tensile hot rolled steel sheet prepared by said method.This is cold
The tissue of molding high tensile hot rolled steel sheet is mainly acicular ferrite.This cold formability high strength rolled steel
The yield strength of plate is more than 750MPa, preferably 755-780MPa, and tensile strength is 800MPa
Above, preferably 820-860MPa, elongation percentage more than 17%, preferably 17-21%.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited to above-mentioned reality
Execute the detail in mode, in the technology concept of the present invention, can be to the technical side of the present invention
Case carries out multiple simple variant, and these simple variant belong to protection scope of the present invention.
Embodiment
The present invention is further illustrated for below example, but and is not so limited the present invention.
Embodiment 1-5
Molten steel, after steel-making step (molten steel composition after steel-making sees table 1), uses overall argon gas-sealed to water
Casting, molten steel injects tundish by the slide gate nozzle of ladle bottom, and tundish temperature is 1538 DEG C, uses
Funnel-type crystallizer, Casting speed is 0.7m/min, and continuous casting steel billet thickness is 200mm～230mm；Will
Continuous casting steel billet heats in heating furnace, and the strand after heating removes formation on surface through water under high pressure dephosphorization
After iron scale, entering reversible roughing mills, the intermediate blank after roughing enters Coil Box, makes strip steel
Head, tail are exchanged, and then carry out finish rolling, carry out section cooling and batch after finish rolling, thus prepare hot-rolled steel
Plate, wherein, the temperature of heating of plate blank, roughing outlet temperature, workpiece thickness, finish rolling after roughing enter
The thickness of mouth temperature, finish rolling finishing temperature, the rate of cooling of section cooling, coiling temperature and steel plate is respectively
As shown in table 2.
The afterbody sampling of the coil of strip of the hot rolled steel plate for cold formation prepared in above example 1-5, and press
The method specified according to GB/T228.1-2010 detects yield strength (ReL), tensile strength (Rm) and prolongs
Stretch rate (A%)；The method detection cold-bending property that specifies according to GB/T232-2010 (B=35mm,
α=180 °, d=2a；D represents that Bend diameter, a represent that sample thickness, α represent the angle of bending, B table
Show the width of sample), its testing result is shown in Table 3.
Table 1
Table 2
Table 3
| Embodiment | Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage (%) | Cold-bending property |
| 1 | 765 | 832 | 19.5 | Qualified |
| 2 | 772 | 849 | 18.0 | Qualified |
| 3 | 756 | 823 | 20.5 | Qualified |
| 4 | 768 | 844 | 19.0 | Qualified |
| 5 | 775 | 857 | 17.5 | Qualified |
Note: it is qualified for occurring without cracking in cold-bending property test, cracking for defective.
From above-mentioned table 1-3 it can be seen that the hot rolled steel plate for cold formation of the inventive method manufacture had both had height
Intensity has again high tenacity, and its mechanical property fully meets the requirement of cold formability high tensile hot rolled steel sheet.
Claims (9)
1. a manufacture method for hot rolled steel plate for cold formation, the method includes steel-making step, continuous casting step
Suddenly, heating steps, hot continuous rolling step and batch step, it is characterised in that the molten steel after described steel-making becomes
It is divided into: the C of 0.05-0.08 weight %, the Mn of the Si of≤0.05 weight %, 1.8-1.95 weight %,
The Mo of Ti, 0.15-0.25 weight % of the Nb of 0.045-0.06 weight %, 0.1-0.125 weight % ,≤0.025
The P of weight %, the S of≤0.01 weight %, surplus is Fe and inevitable impurity；Described hot continuous rolling
Finish rolling start rolling temperature in step is 950-1000 DEG C, and finish rolling finishing temperature is 870-900 DEG C；Described volume
Take the coiling temperature in step and be 535-580 DEG C: after finish rolling, be cooled to volume with the rate of cooling of 10-30 DEG C/s
Take temperature.
Method the most according to claim 1, wherein, the finish rolling finish to gauge in described hot continuous rolling step
Temperature is 870-895 DEG C；The described coiling temperature batched in step is 540-575 DEG C.
Method the most according to claim 1, wherein, with the rate of cooling of 15-26 DEG C/s after finish rolling
It is cooled to coiling temperature.
4. according to the method described in any one in claim 1-3, wherein, described hot continuous rolling step
In finish rolling start rolling temperature be 950-1000 DEG C.
5. according to the method described in any one in claim 1-3, wherein, described hot continuous rolling step
In, after roughing, the thickness of intermediate blank is 40-60mm.
6. according to the method described in any one in claim 1-3, wherein, the steel after described finish rolling
The thickness of plate is 5-10mm.
7. according to the method described in any one in claim 1-3, wherein, described heating steps is
Strand is made to heat at a temperature of 1230-1265 DEG C.
8. a hot rolled steel plate for cold formation, it is characterised in that described hot rolled steel plate for cold formation is by weighing
Profit requires in 1-7 that the method described in any one prepares.
Hot rolled steel plate for cold formation the most according to claim 8, wherein, this cold formability hot rolling
The yield strength of steel plate is 755-780MPa, and tensile strength is 820-860MPa, and elongation percentage is 17-21%.
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| CN116694989A (en) * | 2023-05-24 | 2023-09-05 | 邯郸钢铁集团有限责任公司 | 700 Mpa-level thin-specification easy-to-weld suspension arm steel and production method thereof |
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| JPS5696054A (en) * | 1979-12-28 | 1981-08-03 | Kobe Steel Ltd | Hot rolled steel plate for flash butt welding and cold working |
| CA2022907C (en) * | 1989-08-09 | 1994-02-01 | Mitsuru Kitamura | Method of manufacturing a steel sheet |
| EP0620289B1 (en) * | 1992-10-30 | 1999-07-14 | JAPAN CASTING & FORGING CORPORATION | High-strength hot-rolled steel sheet excellent in uniform elongation after cold working and process for producing the same |
| JP5176271B2 (en) * | 2005-03-22 | 2013-04-03 | 新日鐵住金株式会社 | Method for producing high-strength steel sheet for line pipe with tensile strength of 760 MPa or higher with suppressed increase in yield strength after heating by coating treatment, and method for producing high-strength steel pipe for line pipe using the same |
| CN102226249A (en) * | 2011-06-13 | 2011-10-26 | 马鞍山钢铁股份有限公司 | High-strength hot rolled steel plate with excellent cold forming property and preparation method thereof |
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