CN105112775B - A kind of high formability hot continuous-milling steel plate and its production method - Google Patents
A kind of high formability hot continuous-milling steel plate and its production method Download PDFInfo
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Abstract
The present invention relates to a kind of high formability hot continuous-milling steel plate and production method.The present invention provides a kind of hot continuous-milling steel plate, and its composition is by weight percentage：C 0.10%～0.15%, Mn：0.35%～0.55%, Si：0.01%～0.10%, S are desirably no more than 0.010%, and remaining is Fe and inevitable impurity；The microscopic structure of the hot continuous-milling steel plate is ferritic structure and pearlitic structrure, and its grain size is 10～11 grades.The yield strength of gained hot continuous-milling steel plate of the invention is in 280～320MPa, 430～470MPa of tensile strength, elongation percentage more than 30%.
Description
Technical field
The present invention relates to a kind of high formability hot continuous-milling steel plate and production method, belong to hot rolled steel plate field.
Background technology
Today's society energy growing tension, environmental issue are projected, and the exploitation of the excellent high formability steel plate of obdurability is adapted to
The trend of conservation-minded society's development, is the direction of ferrous materials development.With automobile, the development of mechanical engineering industry, it is raising
The bearing capacity of automobile, engineering machinery, extend the materials'use life-span, with the good high formability hot rolled steel plate of combination property into
For development trend.
The basic structure material of automobile is steel, and many of which structure is made with parts with steel plate punched, shapes work
Skill is complicated.And the stamping formabilily of sheet material and its intensity and drawability closely related, it is the formability for ensureing that sheet material is good, plate
Material must still have good drawability, relatively low yield tensile ratio under proof strength.SS400 hot continuous rolling steel is plain C-Mn steel,
In order to reduce yield tensile ratio, improve forming property, P, S content to be strictly controlled on smelting procedure, control inclusion behavior, be reduced
Si contents, suppress cementite to be distributed in crystal boundary；Coiling temperature is improved on rolling process, promotes pearlite to separate out, it is appropriate to increase
Crystallite dimension, so as to reduce yield tensile ratio, improves punch forming performance.
A kind of production method of coils of hot-rolled steel disclosed in CN102127684A, reduces C, Mn content in Q235B composition of steel,
Using suitable rolling mill practice and the cold technique of control, the combination property of Q235B steel is improved, inexpensive, high performance Q235B is produced
Coils of hot-rolled steel, but no specific production technology.
CN103343209A discloses a kind of cooling controlling and rolling controlling process for improving common carbon steel board performance, its chemical composition C0.10
～0.20%, Si≤0.30%, Mn0.30～0.70%, P≤0.045%, S≤0.045%, remaining is for ferrum and inevitably
Impurity, smelts and continuous casting is 115mm thick stock material；Blank heating temperature is 1100 DEG C, is incubated 1～2h；Finish rolling adopts high temperature rolling,
1000～1100 DEG C of start rolling temperature, it is ensured that total deformation ＞ 80%, and single pass heavy deformation is not less than 10%, finishing temperature control
At 900 DEG C～950 DEG C；Ultrafast cooling immediately after rolling, 100 DEG C/s of rate of cooling ＞；And final cooling temperature is controlled at 500～600 DEG C,
Room temperature is air cooled to immediately.The patent adopts the ultrafast type of cooling, it is adaptable to relatively thin size hot-rolled steel.
The content of the invention
It is an object of the invention to provide a kind of hot continuous-milling steel plate, the yield strength of gained hot continuous-milling steel plate 280～
320MPa, 430～470MPa of tensile strength, elongation percentage more than 30%.
Technical scheme：
The present invention provides a kind of hot continuous-milling steel plate, and its composition is by weight percentage：C 0.10%～0.15%, Mn：
0.35%～0.55%, Si：0.01%～0.10%, S≤0.010%, remaining is Fe and inevitable impurity；The heat is even
The microscopic structure of rolled steel plate is ferritic structure and pearlitic structrure, and its grain size is 10～11 grades.
Further, the yield strength of the hot continuous-milling steel plate is 280～320MPa, and tensile strength is 430～470MPa, is prolonged
Rate is stretched for more than 30%.
Further, the thickness of the hot continuous-milling steel plate is 3.1mm.
Further, in the hot continuous-milling steel plate production process, slab heating temperature is controlled at 1170～1230 DEG C, finish rolling
, at 840～900 DEG C, oiler temperature control is at 640～700 DEG C for finishing temperature control.
Present invention also offers the production method of above-mentioned hot continuous-milling steel plate, is casting continuously to form slab including by molten steel, then by institute
Stating slab carries out successively heating, roughing, finish rolling, section cooling and batches, wherein,
The heating and temperature control is at 1170～1230 DEG C；
In finishing stands, finishing temperature control is at 840～900 DEG C；
Oiler temperature control is at 640～700 DEG C.
Further, in aforementioned production method, the rate of cooling in laminar cooling process is 10～30 DEG C/sec.
Further, the thickness of the slab that the molten steel is casting continuously to form be 200～250mm, roughing adopt at least 5 passes,
Every time deflection is necessary >=and 20%.
Further, the thickness after the slab rough rolling is 32～38mm.
Beneficial effects of the present invention：
Using 280～320MPa of yield strength, the 430～470MPa of tensile strength of the hot continuous-milling steel plate of present invention production,
Elongation percentage more than 30%, with stable mechanical property, obdurability matching is good, forming property and the characteristics of excellent welding performance.
And the present invention gives full play to controlled rolling and controlled cooling ability, process is simple low with cost of alloy, what general hot continuous rolling can be produced
Advantage.The present invention gives full play to controlled rolling and controlled cooling ability, it is ensured that the mechanical property of strip steel is strong after hot rolling by reducing Si, P, S content
Toughness optimization, fully meets the mechanical property requirements of high formability SS400 hot continuous rolling steel bands.
Specific embodiment
The present invention provides a kind of hot continuous-milling steel plate, and its composition is by weight percentage：C 0.10%～0.15%, Mn：
0.35%～0.55%, Si：0.01%～0.10%, S are desirably no more than 0.010%, and remaining is Fe and inevitable impurity；
The microscopic structure of the hot continuous-milling steel plate is ferritic structure and pearlitic structrure, and its grain size is 10～11 grades.
In the present invention, C is main intensified element, but the too high plasticity that can reduce steel of C content, toughness and weldability
Can, therefore C content is controlled 0.10%～0.15%；The Main Function of Mn is solution strengthening, and the control of Mn contents is 0.35%
～0.55%；In addition, reducing the diffusion that Si contents can suppress C element in austenite, it is to avoid C element is from austenite to ferrite
In grain boundaries segregation during diffusion, cementite tissue is formed.The control of Si contents improves formability 0.01%～0.10%
Energy.
Present invention also offers the production method of above-mentioned hot continuous-milling steel plate, is casting continuously to form slab including by molten steel, then by institute
Stating slab carries out successively heating, roughing, finish rolling, section cooling and batches, wherein,
The heating and temperature control is at 1170～1230 DEG C；
In finishing stands, finishing temperature control is at 840～900 DEG C；
Oiler temperature control is at 640～700 DEG C.
Further, in aforementioned production method, the rate of cooling in laminar cooling process is 10～30 DEG C/sec.
Further, the thickness of the slab that the molten steel is casting continuously to form be 200～250mm, roughing adopt at least 5 passes,
Every time deflection is necessary >=and 20%.The purpose of roughing is the recrystallization for ensureing austenite, fining austenite grains, it is general come
Say, the critical strain amount of austenite if rolled below critical strain amount, can not only refine austenite crystal more than 20%
Grain, and the thick of austenite crystal can be promoted.
In the present invention, the production method of high formability hot continuous-milling steel plate includes：1) slab heating temperature control 1170～
1230 DEG C, both ensured slab be fully heated, the abundant solid solution of alloying element, prevent the abnormal growth of austenite crystal again；2) roughing
Using 5 passages or 7 passes, every time deflection is necessary >=and 20%, it is ensured that austenite recrystallization, fining austenite grains；
3) entry temperature at finishing is not required, and finishing temperature scope is 840～900 DEG C；4) after finish rolling, section cooling adopts sparse cooling
Mode, is cooled to 640～700 DEG C with 10～30 DEG C/sec of rate of cooling and batches；The yield tensile ratio of material is advantageously reduced, is improved
Forming property.
In the present invention, the steel billet after roughing subsequently carries out Coil Box and batches, and the Coil Box can for example be centreless
Transfer Coil Box.In the middle of realizing in the Coil Box, base is exchanged end to end, uniform to ensure the elongated temperature of steel billet；Remove simultaneously
Secondary oxidation iron sheet is bright and clean to ensure steel billet plate face.Middle base Jing Coil Box carries out displacement uncoiling after batching, into finish rolling
Area carries out finish rolling, and entry temperature at finishing is not required, and finishing temperature scope is 840～900 DEG C, and after finish rolling, section cooling is using dilute
The thin type of cooling, is cooled to 640～700 DEG C with 10～30 DEG C/sec of rate of cooling and batches.
The specific embodiment of the present invention is further described with reference to embodiment, not therefore by present invention limit
System is among described scope of embodiments.
Embodiment
The technological process of production is：Desulfurizing iron → converter smelting top-bottom blowing → deoxidation, alloying → furnace rear chain-wales are mended
Feed Al lines → LF refining heating → continuous casting → heating of plate blank → high-pressure water descaling → roughing → Coil Box and batch → finish rolling → laminar flow
Cool down → batch → packaging and storage.
Wherein, the chemical composition of the continuous casting steel billet of each embodiment is as shown in table 1.
The hot-rolled process parameter that each embodiment continuous casting steel billet hot rolling obtains continuous-milling steel plate is as shown in table 2.Enter andante respectively successively
20%), Coil Box volume base heating, water under high pressure dephosphorization, roughing (adopt 5 passes, every time deflection is necessary >=in roughing
Take, finish rolling, section cooling and batch, so as to hot continuous rolling steel band is obtained；Hot-rolled process parameter is as shown in table 2.
Table 3 be the embodiment of the present invention obtain be hot rolled steel plate mechanical property, wherein, the yield strength of the steel band
(ReL), the method that tensile strength (Rm), elongation percentage (A%) specify according to GB/T228.1-2010 is detected；According to GB/
Method that T232-2010 specifies detection cold-bending property (B=35, α=180 °, d=a；D represents that Bend diameter, a represent that sample is thick
Degree, α represent that the angle of bending, B represent the width of sample).
Comparative example
The same embodiment of the technological process of production of comparative example 1 and 2, its chemical composition are as shown in table 1, hot-rolled process parameter such as table
Shown in 2, the mechanical property of gained hot rolled steel plate is as shown in table 3.
The chemical composition of 1 embodiment of table and comparative example
| C | Si | Mn | P | S | |
| Embodiment 1 | 0.14 | 0.02 | 0.43 | 0.009 | 0.008 |
| Embodiment 2 | 0.15 | 0.07 | 0.45 | 0.017 | 0.010 |
| Embodiment 3 | 0.13 | 0.04 | 0.42 | 0.012 | 0.007 |
| Embodiment 4 | 0.14 | 0.06 | 0.47 | 0.013 | 0.009 |
| Comparative example 1 | 0.083 | 0.195 | 0.344 | 0.016 | 0.009 |
| Comparative example 2 | 0.12 | 0.2 | 0.21 | 0.018 | 0.012 |
The hot rolling technology controlling value of 2 embodiment of table and comparative example
The mechanical property of the steel plate of 3 embodiment of table and comparative example
Claims (3)
1. hot continuous-milling steel plate, it is characterised in that its composition is by weight percentage：C 0.10%～0.15%, Mn：0.35%
～0.55%, Si：0.01%～0.10%, S≤0.010%, remaining is Fe and inevitable impurity；The hot continuous-milling steel plate
Microscopic structure be ferritic structure and pearlitic structrure, its grain size is 10～11 grades, and yield strength is 280～320MPa,
Tensile strength is 430～470MPa, and elongation percentage is more than 30%；
Its production method is：Slab is casting continuously to form including by molten steel, then the slab is carried out successively heating, roughing, finish rolling, layer
Stream is cooled down and is batched, wherein,
The thickness of the slab that the molten steel is casting continuously to form is 200～250mm；
Heating and temperature control is at 1170～1230 DEG C；
Roughing adopts at least 5 passes, and every time deflection is necessary >=and 20%, the thickness after roughing is 32～38mm；
In finishing stands, finishing temperature control is at 840～900 DEG C；
Rate of cooling in laminar cooling process is 10～30 DEG C/sec；
Oiler temperature control is at 640～700 DEG C.
2. hot continuous-milling steel plate according to claim 1, it is characterised in that the thickness of the hot continuous-milling steel plate is 3.1mm.
3. the production method of hot continuous-milling steel plate described in claim 1 or 2, it is characterised in that include for molten steel being casting continuously to form slab, so
Afterwards the slab carried out successively heating, roughing, finish rolling, section cooling and batched, wherein,
The thickness of the slab that the molten steel is casting continuously to form is 200～250mm；
Heating and temperature control is at 1170～1230 DEG C；
Roughing adopts at least 5 passes, and every time deflection is necessary >=and 20%, the thickness after roughing is 32～38mm；
In finishing stands, finishing temperature control is at 840～900 DEG C；
Rate of cooling in laminar cooling process is 10～30 DEG C/sec；
Oiler temperature control is at 640～700 DEG C.
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| CN107419078A (en) * | 2016-05-23 | 2017-12-01 | 上海梅山钢铁股份有限公司 | Yield strength 345MPa level low cost hot rolled steel plates and its manufacture method |
| CN107287516B (en) * | 2017-06-09 | 2019-04-23 | 唐山不锈钢有限责任公司 | Inexpensive automobile structural steel SAPH400 and its production method |
| CN108728740B (en) * | 2018-04-28 | 2019-12-24 | 唐山钢铁集团有限责任公司 | Hot-rolled steel strip for low-yield-ratio railway vehicle and production method thereof |
| CN110129669A (en) * | 2019-04-25 | 2019-08-16 | 首钢集团有限公司 | A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof |
| CN113201685B (en) * | 2021-03-25 | 2022-06-14 | 马鞍山钢铁股份有限公司 | Economical low-yield-ratio hot-rolled weather-resistant steel plate and manufacturing method thereof |
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| CN1203931C (en) * | 2003-02-09 | 2005-06-01 | 攀枝花钢铁有限责任公司钢铁研究院 | Method for producing hot rolled steel sheet having ultra fine grains and hot rolled steel sheet manufactured thereby |
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