CN109702022A - A method of prevent medium and high carbon steel coils of hot-rolled steel from generating smooth contusion defect - Google Patents
A method of prevent medium and high carbon steel coils of hot-rolled steel from generating smooth contusion defect Download PDFInfo
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Abstract
Prevent medium and high carbon steel coils of hot-rolled steel from generating the smooth method for dampening defect the present invention provides a kind of, including Strip Roughing, finish rolling, section cooling, coil into that coil of strip, coil of strip be air-cooled, smooth process, the present invention passes through while adjusting the parameter of laminar flow cooling parameter and smooth process, ensure that strip completes phase transformation before batching, prevent strip after batching because the changing of the relative positions occurring between layers due to loose winding；And when planisher is smooth, uncoiler forward pull and winder backward pull are reduced, smooth speed is reduced, led to smooth contusion because coil of strip generates friction between layers under tension when avoiding coil of strip smooth, improve the surface quality of coil of strip, reduce quality risk.
Description
Technical field
The invention belongs to hot-strip technical field of producing, and in particular to one kind prevents medium and high carbon steel coils of hot-rolled steel from producing
The whole method for dampening defect of life.
Background technique
Thin gauge medium and high carbon steel coils of hot-rolled steel generally uses after pickling or cold rolling, be widely used to auto parts and components,
The tools such as blade of carving knife, scissors, steel ruler or measurer, requirement of these purposes to surface quality of hot rolled steel coils are all very high.
For medium and high carbon steel because carbon content is high, the part trade mark also added a certain amount of alloy or microalloy element, traditional work
Skill produces hot-strip generally by the way of air-cooled or water cooling and high temperature coiling, in order to reduce the hardness of strip.This
Under kind process conditions, austenite just occurs substantially after batching for medium and high carbon steel coils of hot-rolled steel produced to ferrite, pearly-lustre
The transformation of body can bring following problem: (1) changing of the relative positions will occur after the phase change between layers for coil of strip, cause loose winding, this coil of strip
When subsequent smooth, under tension, strip generates friction between layers, smooth contusion phenomenon occurs；(2) coil of strip batches
Afterwards at a higher temperature, it is undergone phase transition in air, iron scale is thicker, and thicker iron scale is easier in smooth layer
There is smooth contusion when rubbing with layer.
In terms of the smooth contusion of control coil of strip and scuffing, filed in Wuhan Iron & Steel (Group) Corp. on May 12nd, 2014
Chinese patent CN201410199349.2, patent name are as follows: eliminate the control method that hot-strip finish is dampened, disclosure
By adjusting strip steel head (1-3m) coiling temperature and smooth adjustment when technological parameter solve the problems, such as contusion, strip
With a thickness of 2mm hereinafter, steel grade be general carbon or mild steel, be not particularly suited for medium and high carbon steel.Beijing Shoudu Steel Co., Ltd in
06 month 2014 Chinese patent CN201410268624.1, patent name filed in 16 days are as follows: prevent strip smooth in planisher
The method and device for scratching defect is generated in the process, and it discloses the parameters by single adjustment planisher to solve smooth scuffing
Problem, the cold-rolled strip of low-intensity and high-elongation mainly for thin gauge, and it is not suitable for coils of hot-rolled steel.
Therefore, it is necessary to research and develop a set of technology for preventing medium high carbon coils of hot-rolled steel from generating smooth contusion defect.
Summary of the invention
It is put down in order to solve the above technical problems, preventing medium and high carbon steel coils of hot-rolled steel from generating the purpose of the present invention is to provide one kind
The whole method for dampening defect is led because coil of strip generates friction between layers under tension when coil of strip can be prevented smooth
The surface quality of coil of strip can be improved in the smooth contusion problem caused, reduces coil of strip quality risk.
To achieve the above object, the technical solution adopted by the present invention is that: it is flat that one kind prevents medium and high carbon steel coils of hot-rolled steel from generating
The whole method for dampening defect, including Strip Roughing, finish rolling, section cooling, coil into that coil of strip, coil of strip be air-cooled, smooth process, wherein
Section cooling takes leading portion layer cold；
The parameter setting method of the section cooling process, comprising the following steps:
According to the Supercooled Austenite Isothermal Transformation Diagram (TTT curve) of strip steel grade, determine strip nose warm spot temperature and
Strip mutually fades to the time for terminating phase transformation from beginning at a temperature of nose warm spot；
The cold final cooling temperature of leading portion layer is set as the nose warm spot temperature of strip, leading portion layer cold junction beam to batch temperature measuring point when
Between be set greater than and be equal to strip at a temperature of nose warm spot and start mutually to fade to the time for terminating phase transformation；
The parameter setting of the smooth process are as follows:
Forward pull is set as 80~100KN, and backward pull is set as 180~200KN, and smooth speed is set as 80~100m/
min。
Preferably, the coiling temperature of strip is set as 550~630 DEG C, and strip coiling tension is 20~40MPa.
Preferably, finishing temperature is set as 800~900 DEG C.
Preferably, the strip with a thickness of 1.2~3.5mm, width is 900~1600mm.
Compared with prior art, the invention has the following advantages:
The present invention according to the Supercooled Austenite Isothermal Transformation Diagram (TTT curve) of steel grade determine strip nose warm spot temperature and
Phase transformation starts the time terminated to phase transformation at a temperature of nose warm spot, according to the parameter of above-mentioned data setting section cooling, to ensure band
Steel completes phase transformation of the austenite to pearlite+ferrite (or pearlite) before batching, and avoids process of the strip after batching
It undergoes phase transition, leads to coil of strip relative movement between layers and the loosening of coil of strip, and then prevent coil of strip from generating smooth dampen and lack
It falls into；
When planisher is smooth in process, forward pull is set as 80~100KN, be equivalent to same specification (strip width and
Thickness) Q235B straight carbon steel forward pull 60%~80%, backward pull is set as 180~200KN, is equivalent to same specification (strip
Width and thickness) Q235B straight carbon steel backward pull 80%~90%；Smooth speed is set as 80~100m/min, is equivalent to
The 70%~80% of the smooth speed of same specification (strip width and thickness) Q235B straight carbon steel.Planisher is smooth on coil of strip, wherein putting down
Complete machine includes uncoiler and winder, reduces uncoiler forward pull and winder backward pull, reduces smooth speed, further prevent
Coil of strip generates smooth contusion defect.
The present invention adjusts the parameter of laminar flow cooling parameter and smooth process simultaneously, it is ensured that strip completes phase before batching
Become, prevent process of the strip after batching from undergoing phase transition, and when planisher is smooth, after reducing uncoiler forward pull and winder
Tension reduces smooth speed, causes under tension because coil of strip generates friction between layers when avoiding coil of strip smooth
Smooth contusion improves the surface quality of coil of strip, reduces quality risk.
Specific embodiment
The embodiment of the present invention is described below in detail, it is intended to be used to explain the present invention, and should not be understood as to of the invention
Limitation.
A kind of method for preventing medium and high carbon steel coils of hot-rolled steel from generating smooth contusion defect provided in an embodiment of the present invention, including
Strip Roughing, section cooling, coils into that coil of strip, coil of strip be air-cooled, smooth process at finish rolling, and wherein section cooling takes leading portion layer cold；
The parameter setting method of the section cooling process, comprising the following steps:
According to the Supercooled Austenite Isothermal Transformation Diagram (TTT curve) of strip steel grade, determine strip nose warm spot temperature and
Strip mutually fades to the time for terminating phase transformation from beginning at a temperature of nose warm spot；
The cold final cooling temperature of leading portion layer is set as the nose warm spot temperature of strip, leading portion layer cold junction beam to batch temperature measuring point when
Between be set greater than and be equal to strip at a temperature of nose warm spot and start mutually to fade to the time for terminating phase transformation；
The parameter setting of the smooth process are as follows:
Forward pull is set as 80~100KN, and backward pull is set as 180~200KN, and smooth speed is set as 80~100m/
min。
The embodiment of the present invention determines the nose temperature of steel grade according to the Supercooled Austenite Isothermal Transformation Diagram (TTT curve) of strip
Phase transformation starts the time terminated to phase transformation at a temperature of point temperature and nose warm spot, according to the parameter of above-mentioned data setting section cooling,
Phase transformation of the austenite to pearlite+ferrite (or pearlite) is completed to ensure strip before batching, strip is avoided to batch
Process afterwards is undergone phase transition, and leads to coil of strip relative movement between layers and the loosening of coil of strip, and then it is flat to prevent coil of strip from generating
Whole contusion defect；
When planisher is smooth in process, forward pull is set as 80~100KN, be equivalent to same specification (strip width and
Thickness) Q235B straight carbon steel forward pull 60%~80%, backward pull is set as 180~200KN, is equivalent to same specification (strip
Width and thickness) Q235B straight carbon steel backward pull 80%~90%；Smooth speed is set as 80~100m/min, is equivalent to
The 70%~80% of the smooth speed of same specification (strip width and thickness) Q235B straight carbon steel.Planisher is smooth on coil of strip, wherein putting down
Complete machine includes uncoiler and winder, reduces uncoiler forward pull and winder backward pull, reduces smooth speed, further prevent
Coil of strip generates smooth contusion defect.
The embodiment of the present invention adjusts the parameter of laminar flow cooling parameter and smooth process simultaneously, it is ensured that strip is complete before batching
At phase transformation, process of the strip after batching is avoided to undergo phase transition, and when planisher is smooth, reduces uncoiler forward pull and winding
Machine backward pull reduces smooth speed, when avoiding coil of strip smooth under tension due to coil of strip generates friction between layers
Lead to smooth contusion, improve the surface quality of coil of strip, reduces quality risk.
Wherein it is possible to the heat transmission belt according to final cooling temperature, mill speed, layer-cold roller way length and strip in layer-cold roller way
The temperature change come, is calculated suitable finishing temperature and coiling temperature using heat transfer equation group and method for numerical simulation.
Preferably, the parameter setting of the coiling process are as follows: the coiling temperature of strip is set as 550~630 DEG C, band coil of strip
Taking tension is 20~40MPa.
The coiling temperature be 550~630 DEG C, strip is terminated to from section cooling batch during will appear return it is red,
According to the red heat of transformation, strip and roller-way transmission of heat by contact is returned, the strip temperature that three aspect heat transmission belt of radiant heat transfer comes in air becomes
Change can calculate corresponding coiling temperature.And coiling temperature described in the embodiment of the present invention compared with the prior art in coiling temperature
Much lower, the oxidation film on coil of strip surface is relatively thin, even if the changing of the relative positions occurs between layers for coil of strip, the contusion phenomenon that coil of strip occurs also compares
The prior art is more minor.
And strip coiling tension is 20~40MPa, same specification (such as the width and thickness of strip) Q235B straight carbon steel
110%~125%, the raising of coiling tension avoids coil of strip when unwinding from generating so that coil of strip is even closer between layers
Loosening between layers.
Preferably, finishing temperature is set as 800~900 DEG C, finishing temperature can be adjusted according to the TTT curve of steel grade, into one
Step ensures that strip completes phase transformation of the austenite to pearlite+ferrite (or pearlite) before batching.
Preferably, coil of strip is air-cooled to 60 DEG C or less.
The embodiment of the present invention solves by adjusting the finish to gauge of hot rolling, coiling temperature, section cooling, smooth technological parameter
Medium and high carbon steel coils of hot-rolled steel leads to the problem of in formation process surface and dampens defect, improve coil of strip surface quality and at
Material rate, while also having certain effect to the iron scale thickness for reducing belt steel surface and the performance uniformity for improving coil of strip.
In the various embodiments described above, the chemical component weight percentage composition of the strip are as follows: C:0.3%~1.2%, Si:
0.1%~0.50%, Mn:0.1%~1.4%, P :≤0.02%, S :≤0.02%, Cr+Ni+Mo :≤2.0%, Al :≤
0.06%, remaining is Fe and inevitable impurity；Strip with a thickness of 1.2~3.5mm, width is 900~1600mm.
Below by way of specific embodiment, the present invention is further illustrated:
Embodiment 1
Using SK85 continuous casting steel billet as raw material, after roughing, finish rolling, section cooling, coils of hot-rolled steel is coiled into.The change of strip
Study point and its mass percentage are as follows: C 0.861%, Si 0.213%, Mn 0.405%, P0.012%, S 0.0028%,
Al 0.012%, Ca 0.0009%, remaining is Fe and inevitable impurity.The specification of strip is thickness 2.5mm × width
1350mm。
The finishing temperature of strip is 900 DEG C, and section cooling is cooling for leading portion, and the cooling final cooling temperature of leading portion is 570 DEG C, band
To be cooled to the time for batching temperature measuring point be 5s to steel from terminating, and set coiling temperature as 590 DEG C, strip coiling tension is set as advising together
The 110% of lattice Q235B is 25MPa.Coil of strip is put into burial pit slow cooling after batching, upper planisher is smooth after being cooled to room temperature.Setting
Uncoiler forward pull is the 60% of same specification Q235B, is 80KN；Backward pull is the 72% of Q235B, is 180KN；Smooth speed is
The 70% of same specification Q235B is 100m/min.
Surface is obtained after smooth without smooth contusion, bright smooth SK85 finishing volume.
Embodiment 2
Using 65Mn continuous casting steel billet as raw material, after roughing, finish rolling, section cooling, coils of hot-rolled steel is coiled into.The change of strip
Study point and its mass percentage are as follows: C 0.670%, Si 0.254%, Mn 1.016%, P0.013%, S 0.0021%,
Al 0.023%, Ca 0.0011%, remaining is Fe and inevitable impurity.The specification of strip is thickness 3.0mm × width
1600mm。
The finishing temperature of strip is 850 DEG C, and the cooling final cooling temperature of laminar flow leading portion is 580 DEG C, and strip is cooled to from termination
The time for batching temperature measuring point is 6.5s, sets coiling temperature as 600 DEG C, strip coiling tension is set as same specification Q235B's
125%, it is 38MPa.Coil of strip is put into burial pit slow cooling after batching, upper planisher is smooth after being cooled to room temperature.Before setting uncoiler
Tension is the 80% of same specification Q235B, is 100KN；Backward pull is the 68% of Q235B, is 200KN；Smooth speed is same specification
The 70% of Q235B is 80m/min.
Surface is obtained after smooth without smooth contusion, bright smooth 65Mn finishing volume.
Embodiment 3
Using S50C continuous casting steel billet as raw material, after roughing, finish rolling, section cooling, coils of hot-rolled steel is coiled into.The change of strip
Study point and its mass percentage are as follows: C 0.522%, Si 0.235%, Mn 0.753%, P0.015%, S 0.0025%,
Al 0.018%, Cr 0.153%, Ca 0.0009%, remaining is Fe and inevitable impurity.The specification of strip is thickness
1.5mm × width 1200mm.
The finishing temperature of strip is 900 DEG C, and the cooling final cooling temperature of laminar flow leading portion is 600 DEG C, and strip is cooled to from termination
The time for batching temperature measuring point is 3.5s, sets coiling temperature as 600 DEG C, strip coiling tension is set as same specification Q235B's
110%, it is 22MPa.Coil of strip is put into burial pit slow cooling after batching, upper planisher is smooth after being cooled to room temperature.Before setting uncoiler
Tension is the 60% of same specification Q235B, is 80KN；Backward pull is the 74% of Q235B, is 180KN；Smooth speed is same specification
The 70% of Q235B is 100m/min.
Surface is obtained after smooth without smooth contusion, bright smooth S50C finishing volume.
Embodiment 4
Using 30CrMo continuous casting steel billet as raw material, after roughing, finish rolling, section cooling, coils of hot-rolled steel is coiled into.Strip
Chemical component and its mass percentage are as follows: C 0.308%, Si 0.235%, Mn 0.614%, Cr 0.976%, Mo
0.188%, P 0.011%, S 0.0020%, Al 0.024%, Ca 0.0018%, remaining is Fe and inevitable impurity.
The specification of strip is thickness 3.0mm × width 1300mm.
The finishing temperature of strip is 900 DEG C, and the cooling final cooling temperature of laminar flow leading portion is 600 DEG C, and strip is cooled to from termination
The time for batching temperature measuring point is 5s, sets coiling temperature as 610 DEG C, strip coiling tension is set as same specification Q235B's
125%, it is 31MPa.Coil of strip is put into burial pit slow cooling after batching, upper planisher is smooth after being cooled to room temperature.Before setting uncoiler
Tension is the 80% of same specification Q235B, is 100KN；Backward pull is the 80% of Q235B, is 220KN；Smooth speed is same specification
The 80% of Q235B is 100m/min.
Surface is obtained after smooth without smooth contusion, bright smooth 30CrMo finishing volume.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modification-equivalent replacement and improvement etc., should all be included in the protection scope of the present invention within principle.
Claims (5)
1. it is a kind of prevent medium and high carbon steel coils of hot-rolled steel generate it is smooth dampen defect method, which is characterized in that including Strip Roughing,
Finish rolling, section cooling coil into that coil of strip, coil of strip be air-cooled, smooth process, and wherein section cooling takes leading portion layer cold；
The parameter setting method of the section cooling process, comprising the following steps:
According to the Supercooled Austenite Isothermal Transformation Diagram of strip steel grade, determine strip nose warm spot temperature and nose warm spot at a temperature of band
Steel mutually fades to the time for terminating phase transformation from beginning；
The cold final cooling temperature of leading portion layer is set as the nose warm spot temperature of strip, and leading portion layer cold junction beam to the time for batching temperature measuring point is set
Strip at a temperature of being more than or equal to nose warm spot is set to start mutually to fade to the time for terminating phase transformation；
The parameter setting of the smooth process are as follows:
Forward pull is set as 80~100KN, and backward pull is set as 180~200KN, and smooth speed is set as 80~100m/min.
2. according to claim 1 prevent medium and high carbon steel coils of hot-rolled steel from generating the smooth method for dampening defect, feature exists
In the parameter setting of the coiling process are as follows: the coiling temperature of strip is set as 550~630 DEG C, and strip coiling tension is 20~
40MPa。
3. according to claim 1 prevent medium and high carbon steel coils of hot-rolled steel from generating the smooth method for dampening defect, feature exists
In finishing temperature is set as 800~900 DEG C.
4. according to claim 1 prevent medium and high carbon steel coils of hot-rolled steel from generating the smooth method for dampening defect, feature exists
In coil of strip is air-cooled to 60 DEG C or less.
5. preventing medium and high carbon steel coils of hot-rolled steel from generating smooth contusion defect described in any claim according to claim 1~4
Method, which is characterized in that the strip with a thickness of 1.2~3.5mm, width is 900~1600mm.
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| CN111054763A (en) * | 2019-11-21 | 2020-04-24 | 邯郸钢铁集团有限责任公司 | Flattening control method for 700 MPa-level hot-rolled high-strength steel arch back defects |
| CN113369312A (en) * | 2021-04-13 | 2021-09-10 | 南京钢铁股份有限公司 | Control process for Q235 pockmarks with specification of 25-40mm |
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| CN109702022B (en) | 2020-05-01 |
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