CN107470373A - A kind of stainless steel dual phase steel method for coiling - Google Patents
A kind of stainless steel dual phase steel method for coiling Download PDFInfo
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- CN107470373A CN107470373A CN201710629478.4A CN201710629478A CN107470373A CN 107470373 A CN107470373 A CN 107470373A CN 201710629478 A CN201710629478 A CN 201710629478A CN 107470373 A CN107470373 A CN 107470373A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
Abstract
The invention provides a kind of stainless steel dual phase steel method for coiling, it comprises the following steps：Dual phase steel slab after roughing is placed in finishing mill volume stove and carries out finish rolling calendering, obtains the dual phase steel strip after finish rolling calendering；By the finish rolling roll after dual phase steel strip carry out successively section cooling, batch with water cooling pond cool down, obtain two-phase product made from steel after being cooled to room temperature；Wherein, the furnace temperature of the finishing mill volume stove is 1000 DEG C 1050 DEG C, and the temperature batched is 450 DEG C 750 DEG C.Wherein, dual phase steel slab includes 2205 steel grades or 2507 steel grades, and the coiling temperature of 2205 steel grades is 600 DEG C 750 DEG C；The coiling temperature of 2507 steel grades is 450 DEG C 700 DEG C.
Description
Technical field
The invention belongs to metallurgical calendering formation field, is related to a kind of stainless steel dual phase steel method for coiling.
Background technology
Dual phase steel is that have typical austenite and ferrite 1:1 duplex structure, it is resistance to containing substantial amounts of Cr, Mo and N etc.
Corrosivity intensified element.Therefore dual phase steel SCC resistant to salt corrosion, crevice corrosion, abrasion and the repellence corroded are very high, have height
Intensity, make product lightweight, the characteristics of welding performance is good.So stainless steel dual phase steel is widely used, surcharge is high.
But hot-rolled dual-phase steel easily forms that side is split, brittle failure is split etc. in production that production quality accident, task difficulty are big.Its
Reason is mainly reflected in difficult point and separates out section (700-975 DEG C) and 475 DEG C of fragility sections (350-525 DEG C) to 850 DEG C of σ phases
Temperature control on.For example the dual phase steel after finish rolling needs quick cooling, avoids phase transformation section.
Because the elements such as the chromium in dual phase steel, molybdenum, nitrogen make it have strong resistance to spot corrosion and slit and corrosion resistant performance, most of
Application in environment is better than 316L steel or 317L steel, therefore considers to carry out cooling treatment for a long time directly in aqueous medium.
If coiling temperature is bad may to undergo phase transition embrittlement in actual production, equipment or personnel are caused to injure, it should
Firmly avoided.More strict temperature treatment system should be taken to 2507 grade super duplex steels.Although on document have more
Illustrate that dual phase steel is related to the temperature treatment section in the management section of σ phases and 475 DEG C, that is, roll finishing temperature control and analysed in σ phases
Go out more than 980 DEG C of section, be quickly cooled to less than 750 DEG C (within 5min), but to how to realize stable objects temperature treatment
Method, concrete scheme was not proposed also.A kind of on the other hand, side that can realize stable objects temperature treatment of my Csr Practice
Method.
The content of the invention
In view of the shortcomings that above-mentioned prior art, it is an object of the invention to provide a kind of stainless steel dual phase steel method for coiling,
It can carry out stable objects temperature treatment to volume stove milling train hot-rolled stainless steel dual phase steel, avoid easily occurring in specified temp section
Brittlement phase separates out, while avoids coiling temperature setting is too low from the strip supercooling quality defect such as deformed steel strip and galled spots occur.
In order to reach foregoing goal of the invention, the present invention provides a kind of stainless steel dual phase steel method for coiling, and it includes following
Step：
Dual phase steel slab after roughing is placed in finishing mill volume stove and carries out finish rolling calendering, is obtained double after finish rolling calendering
Phase steel band steel；
By the finish rolling roll after dual phase steel strip carry out successively section cooling, batch with water cooling pond cool down, be cooled to
Two-phase product made from steel is obtained after room temperature；
Wherein, the furnace temperature of the finishing mill volume stove is 1000 DEG C -1050 DEG C,
The temperature batched is 450 DEG C -750 DEG C.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that the dual phase steel slab includes 2205 steel grades or 2507
Steel grade；It is highly preferred that the coiling temperature of 2205 steel grade is 600 DEG C -750 DEG C；It is highly preferred that 2507 steel grade batches
Temperature is 450 DEG C -700 DEG C.The steel grade of the stainless steel dual phase steel typical case trade mark 2205 is ASTM2205, the stainless steel dual phase steel
The typical steel grade of the trade mark 2507 is ASTM2507, and the trade mark corresponding to other standards is equally applicable.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that the finishing temperature of finish rolling calendering for 1000 DEG C-
1050℃；It is highly preferred that the finishing temperature of the 2205 steel grade finish rolling calendering is 1000 DEG C -1020 DEG C；The 2507 steel grade essence
The finishing temperature that roll compacting is prolonged is 1010 DEG C -1050 DEG C.
After dual phase steel reaches target thickness according to technological requirement by finish rolling calendering, because Steckel Mill needs are more
Secondary threading, strip need to be wrapped in rolling drum end to end, it is therefore desirable to strictly control coiling temperature, i.e., need to control finishing temperature control
More than the upper section that σ phases separate out (980 DEG C), if the temperature of rolling drum is lower than belt steel temperature, strip head and tail temperature can be caused
Losing seriously, the present invention rolls up furnace temperature by raising, raising rolling drum temperature (original 980 DEG C of in-furnace temperature, now 1000 DEG C of setting-
1050 DEG C), it is possible to reduce rolling drum causes the thermal loss of strip end to end, alleviates thermal loss end to end, ensures finishing mill calendering
Finishing temperature is higher than σ phase Precipitation Temperatures section (700-975 DEG C), avoid occurring in finish rolling calender line a large amount of σ phases make it is described
The plasticity of dual phase steel is reduced, and calendering work is normally completed so as to reach.Carry out water-cooled cooling again after the completion of batching, avoid volume
Take temperature directly to set less than 475 DEG C, cause dual phase steel strip to be subcooled, template is bad and galled spots.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that the cooldown rate of the section cooling is 500-1300
℃/min。
In above-mentioned stainless steel dual phase steel method for coiling, the section cooling passes through cooling water flow control device and temperature
Detection means Collaborative Control, first according to the finishing temperature of dual phase steel and the steel grade with reference to dual phase steel strip, thickness, forward speed
Cooling water flow is preset etc. parameter, and detects the surface temperature of strip in real time by temperature-detecting device, it is real-time by what is detected
Temperature feedback gives cooling water flow control device, cold to control so as to adjust the dynamic switch of laminar flow water-cooling-sprayer (header)
But water-carrying capacity, until reaching required target temperature, the control to coiling temperature is realized.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that the section cooling time that 2205 steel grade uses≤
5min, temperature≤750 DEG C of strip after section cooling.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that the section cooling time that 2507 steel grade uses≤
3min, temperature≤700 DEG C of strip after section cooling
During finish rolling is calendered to and batches completion, for 980 DEG C of -750 DEG C of sections of calendering finishing temperature, laminar flow is taken
Cool down CTC (Coil temperature control) and carry out temperature control, the control of 2205 steel grades is cooled within 5min
Less than 750 DEG C, the control of 2507 steel grades is cooled to less than 700 DEG C within 3min, is controlled by the section cooling CTC, makes institute
State the dual phase steel after finish rolling and separate out section (700-975 DEG C) quickly through with 850 DEG C of σ phases for representative, so as to prevent two-phase
Steel brittle failure caused by finish rolling is calendered to and batches a large amount of σ phases of completion stage appearance.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that the Cl in the water cooling pond-Content≤70ppm.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that the water cooling pond uses circulating cooling water cooling, described
The water temperature in water cooling pond is 30 DEG C -60 DEG C.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that cooling of the dual phase sheet steel in the water cooling pond
Speed is 1-4.5 DEG C/min, cool time 8h-10h.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that in 2205 steel grades described in 350 DEG C of -525 DEG C of stages in institute
It is 1.5 DEG C/min-4.5 DEG C/min to state the cooldown rate in water cooling pond；Preferably 3.0-4.5 DEG C/min.
In above-mentioned stainless steel dual phase steel method for coiling, it is preferable that in 2507 steel grades described in 350 DEG C of -525 DEG C of stages in institute
It is 2.0 DEG C/min-4.5 DEG C/min to state the cooldown rate in water cooling pond；Preferably 4.0-4.5 DEG C/min.In 350 DEG C of -525 DEG C of ranks
The cooldown rate of section 2205 steel grades of control and 2507 steel grades, can avoid the precipitation of excessive brittlement phase.
In above-mentioned stainless steel dual phase steel method for coiling, the water cooling pond is provided with water inlet, overfall, water temperature detection dress
Put and inlet regulator.Detect the water temperature in water cooling pond in real time by temperature detector, feed back to inlet regulator, so
Afterwards according to the real-time water temperature of feedback, inflow is adjusted, it is ensured that the water temperature in water cooling pond is 30 DEG C -60 DEG C.
Dual phase steel after batching is placed in water cooling pond and cooled, makes it quickly through with 475 DEG C of fragility sections for representative
It (350 DEG C -525 DEG C), can avoid that production quality accident caused by brittlement phase precipitation causes strip brittle failure occurs；Also avoid simultaneously
Coiling temperature is directly set at that strips supercooling templates caused by less than 475 DEG C are bad and galled spots.Pass through strict control water
The water quality of cold drop, it can prevent from producing new surface defect in belt steel surface during cooling.
Beneficial effects of the present invention：
The present invention rolls up the temperature of stove by improving finishing mill, controls suitable finish rolling finishing temperature, ensure that finish rolling pressure
Prolonging the stage occurs without a large amount of σ phases and separates out, and prevents brittle failure；
To finish rolling roll after the completion of dual phase steel strip cooling procedure carry out control by stages, the first stage rolling-
During batching completion, for calendering finishing temperature 980 DEG C of -750 DEG C of sections, take section cooling temperature control (CTC,
Coil temperature control), the dual phase steel strip after finish rolling is separated out quickly through with 850 DEG C for the σ phases of representative
Section, it is ensured that be calendered in finish rolling and batch the completion stage and occur without a large amount of σ phases, prevent brittle failure；
Second stage takes direct water-cooling temperature control to be cooled to room temperature in less than 750 DEG C after the completion of batching；Pass through water
Dual phase steel after being batched during the cooling effect of cold drop recirculated cooling water is run through with 475 DEG C of brittle temperature ranges for representative,
Brittlement phase precipitation has been effectively shielded from, guarantee is provided for safety in production；Water-cooled cooling is carried out after the completion of batching, avoids volume
Take temperature directly to set less than 475 DEG C, cause dual phase steel strip to be subcooled, template is bad and galled spots；Meanwhile by strict
The water quality management of water cooling pond, avoid Cooling Process and produce new surface defect.
Brief description of the drawings
Fig. 1 is the cooling procedure schematic diagram of 2205 steel grades that embodiment 1 provides and 2507 steel grades that embodiment 2 provides；
Fig. 2 is the water cooling pool structure schematic diagram of embodiment 1 and embodiment 2；
Fig. 3 is the σ phase test charts of 2205 coil of strips of embodiment 1；
Fig. 4 is the σ phase test charts of 2507 coil of strips of embodiment 2；
Fig. 5 is the σ phase test charts of 2205 coil of strips of comparative example 1；
Fig. 6 is the surface pictorial diagram of 2205 coil of strips of comparative example 2；
Fig. 7 is the σ phase test charts of 2507 coil of strips of comparative example 3；
Fig. 8 is crisp section of fracture pictorial diagram of 2507 coil of strips of comparative example 3；
Fig. 9 is the σ phase test charts of 2507 coil of strips of comparative example 4.
Embodiment
In order to which technical characteristic, purpose and the beneficial effect of the present invention is more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1
A kind of method for coiling of 2205 steel grade is present embodiments provided, it comprises the following steps：
The furnace temperature temperature of finishing mill volume stove is set as 1000-1050 DEG C, and controls the finishing temperatures of 2205 steel grades to be>1000
℃；
2205 strips after roughing are placed in finishing mill volume stove and carry out finish rolling calendering, obtain 3.0mm-10mm thickness finish rolling
2205 strips after calendering；
By above-mentioned finish rolling roll after 2205 strips carry out section cooling, according to the finishing temperature of 2205 steel grades, thickness and
The parameters such as the speed that moves ahead preset cooling water flow, and detect the surface temperature of 2205 strips in real time by temperature-detecting device, will
The real time temperature detected feeds back to cooling water flow control device, the dynamic switch of adjustment laminar flow water-cooling-sprayer (header)
To control cooling water flow, the cooldown rate of section cooling is reached 500 DEG C -1300 DEG C/min, and in 5min by this 2205
Strip is cooled to 750 DEG C of ＜, and specific cooling procedure refer to Fig. 1；
2205 strips after section cooling are batched, coiling temperature is 600 DEG C -750 DEG C, 2205 steel after batching
The temperature of volume is 600 DEG C -750 DEG C；
2205 coil of strips after batching are hoisted to water cooling pond by driving, as shown in Fig. 2 the water cooling pond is provided with into water
Mouth, overfall, temperature detector and inlet regulator.Detect the water temperature in water cooling pond in real time by temperature detector,
Inlet regulator is fed back to, then according to the real-time water temperature of feedback, adjusts inflow, the water temperature for control water cooling pond is 30 DEG C-
60 DEG C, and Cl in periodic detection water cooling pond-Content, it is ensured that Cl-Content is in below 70ppm；The water cooling pond uses recirculated cooling water,
The speed of cooling is 1-4.5 DEG C/min, as shown in figure 1,350 DEG C of -525 DEG C of stages, 2205 steel grades are in the water cooling pond
Cooldown rate is 3.0 DEG C/min-4.5 DEG C/min, and 2205 coil of strips reach room temperature after cooling down 8h-10hr in the water cooling pond, then
Take out, complete cooling procedure, 2205 coil of strips after being cooled down.
2205 coil of strips are made in the present embodiment and carry out performance test, test result is as shown in figure 3, Fig. 3 exists for 2205 steel grades
The σ phase test charts batched at a temperature of 700 DEG C, from the figure 3, it may be seen that 2205 steel grades batched at 700 DEG C are big without substantially occurring
The σ phases of amount largely separate out, and γ phases and α phase normal rates duplex structure is presented, and thinking that σ phases largely separate out easily causes
2205 steel grades it is autologous batch operation when afterbody occur brittle failure；Follow-up many experiments prove that oiler temperature control is below 780 DEG C
When, the σ phases of 2205 steel grades separate out it is few, when oiler temperature control is below 750 DEG C, autologous afterbody Brittle fracture probability when batching operation compared with
It is small, meet normal production operation.
From test result, 2205 coil of strips made from the present embodiment realize the stable rolling and just of stainless steel dual phase steel
Often cooling, and a large amount of precipitations of σ phases and other brittlement phases, few surface defects, good plate cut do not occur.
Embodiment 2
A kind of method for coiling of 2507 steel grade is present embodiments provided, it comprises the following steps：
The furnace temperature temperature of finishing mill volume stove is set as 1010-1050 DEG C, and controls the finishing temperatures of 2507 steel grades to be>1020
℃；
2507 strips after roughing are placed in finishing mill volume stove and carry out finish rolling calendering, obtain 5.0m-8.0mm thickness finish rolling
2507 strips after calendering；
By above-mentioned finish rolling roll after 2507 strips carry out section cooling, according to the finishing temperature of 2507 steel grades, thickness and
The parameters such as the speed that moves ahead preset cooling water flow, and detect the surface temperature of 2507 strips in real time by temperature-detecting device, will
The real time temperature detected feeds back to cooling water flow control device, the dynamic switch of adjustment laminar flow water-cooling-sprayer (header)
To control cooling water flow, the cooldown rate of section cooling is set to reach 500-1300 DEG C/min, and by 2507 band in 3min
Steel is cooled to<700 DEG C, specific cooling procedure refer to Fig. 1；
2507 strips after section cooling are batched, the temperature of 2507 coil of strips after batching is 450 DEG C -700 DEG C；
2507 coil of strips after batching are hoisted to water cooling pond by driving, as shown in Fig. 2 the water cooling pond is provided with into water
Mouth, overfall, temperature detector and inlet regulator.Detect the water temperature in water cooling pond in real time by temperature detector,
Inlet regulator is fed back to, then according to the real-time water temperature of feedback, adjusts inflow, the water temperature for control water cooling pond is 30 DEG C-
60 DEG C, and Cl in periodic detection water cooling pond-Content, it is ensured that Cl-Content is in below 70ppm；The water cooling pond uses recirculated cooling water,
The speed of cooling is 1-4.5 DEG C/min, as shown in figure 1,350 DEG C of -525 DEG C of stages, 2507 steel grades are in the water cooling pond
Cooldown rate is 4.0 DEG C/min-4.5 DEG C/min, and 2507 coil of strips reach room temperature after cooling down 8h-10hr in the water cooling pond, then
Take out, complete cooling procedure, 2507 coil of strips after being cooled down.
2507 coil of strips are made in the present embodiment and carry out performance test, test result is as shown in figure 4, Fig. 4 exists for 2507 steel grades
The σ phase test charts batched at a temperature of 600 DEG C, as shown in Figure 4,2507 steel grades batched at 600 DEG C are big without substantially occurring
The σ phases of amount largely separate out, and γ phases and α phase normal rates duplex structure is presented, and think that σ phases largely separate out and result in 2507 steel
Kind it is autologous batch operation when afterbody there occurs brittle failure；Follow-up many experiments prove, when oiler temperature control is below 700 DEG C,
The σ phases of 2507 steel grades separate out few, and autologous afterbody Brittle fracture probability when batching operation is smaller, meets normal production operation.
From test result, 2507 coil of strips made from the present embodiment realize the stable rolling and just of stainless steel dual phase steel
Often cooling, and a large amount of precipitations of σ phases and other brittlement phases, few surface defects, good plate cut do not occur.
Comparative example 1
The step of this comparative example provides a kind of method for coiling of 2205 steel grade, and it uses embodiment 1 is batched, and is distinguished
In the oiler temperature control that this comparative example uses is at 800 DEG C.
The 2205 of acquisition is batched to this comparative example batch steel grade and test, test result is as shown in figure 5, Fig. 5 is 2205
The σ phase test charts that steel grade batches at a temperature of 800 DEG C, boundary darkened locations are σ phases, as shown in Figure 5, are batched at 800 DEG C
2205 steel grades there is substantial amounts of σ phase and largely separate out, think that a large amount of precipitations of σ phase result in 2205 steel grades and batch work autologous
There occurs brittle failure for afterbody during industry.
Comparative example 2
The step of this comparative example provides a kind of method for coiling of 2205 steel grade, and it uses embodiment 1 is batched, and is distinguished
In for the oiler temperature control that this comparative example uses at 475 DEG C, the coiling temperature of this comparative example is less than 500 DEG C, in theory will not be again
It is a large amount of to separate out brittlement phase, but the thick flitch type performance that this comparative example obtains is bad.Fig. 6 be 475 DEG C at a temperature of batch 2205
The surface of steel grade, as shown in fig. 6, more scratch occurs in the 2205 steel grade surface, this, which is due to that coiling temperature is too low, causes
2205 strips supercooling, wooden dipper bent plate type is bad, and surface defect is generated in Cooling Process.
Comparative example 3
The step of this comparative example provides a kind of method for coiling of 2507 steel grade, and it uses embodiment 2 is batched, and is distinguished
In the oiler temperature control that this comparative example uses is at 800 DEG C.
The 2507 of acquisition is batched to this comparative example batch steel grade and test, test result is as shown in fig. 7, Fig. 7 is 2507
The σ phase test charts that steel grade batches at a temperature of 800 DEG C, boundary darkened locations are σ phases, as shown in Figure 7, are batched at 800 DEG C
2507 steel grades there is substantial amounts of σ phase and largely separate out, think that a large amount of precipitations of σ phase result in 2507 steel grades and batch work autologous
There occurs brittle failure, fracture are as shown in Figure 8 for afterbody during industry.
Comparative example 4
The step of this comparative example provides a kind of method for coiling of 2507 steel grade, and it uses embodiment 2 is batched, and is distinguished
In the oiler temperature control that this comparative example uses is at 760 DEG C.
The 2507 of acquisition is batched to this comparative example batch steel grade and test, test result is as shown in figure 9, Fig. 9 is 2507
The σ phase test charts that steel grade batches at a temperature of 760 DEG C, boundary darkened locations are σ phases, as shown in Figure 9, are batched at 760 DEG C
Though 2507 steel grades there are not substantial amounts of σ phases and separate out, but be clearly present of comparatively fine σ phases and separate out, cause to batch
Generation brittle failure, it is impossible to complete normal production operation.
From embodiment 1 and comparative example 1-2, the coiling temperature of 2205 steel grades is at 600-750 DEG C, it is possible to achieve 2205
The stable rolling of two phase stainless steel coil of strip and normal cooling, and a large amount of precipitations of σ phases and other brittlement phases, surface defect do not occur
It is few, good plate cut.From embodiment 2 and comparative example 3-4, the coiling temperature of 2507 steel grades is at 450-700 DEG C, it is possible to achieve
The stable rolling of 2507 two phase stainless steel coil of strips and normal cooling, and a large amount of precipitations of σ phases and other brittlement phases do not occur, and table
Planar defect is few, good plate cut.
In summary, the present invention rolls up the temperature of stove by improving finishing mill, controls suitable finish rolling finishing temperature, ensures
Finish rolling calendering stage occurs without a large amount of σ phases and separated out, and prevents brittle failure；
To finish rolling roll after the completion of dual phase steel strip cooling procedure carry out control by stages, the first stage rolling-
During batching completion, for calendering finishing temperature 980 DEG C of -750 DEG C of sections, take section cooling temperature control (CTC,
Coil temperature control), the dual phase steel strip after finish rolling is separated out quickly through with 850 DEG C for the σ phases of representative
Section, it is ensured that be calendered in finish rolling and batch the completion stage and occur without a large amount of σ phases, prevent brittle failure；
Second stage takes direct water-cooling temperature control to be cooled to room temperature in less than 750 DEG C after the completion of batching；Pass through water
Dual phase steel after being batched during the cooling effect of cold drop recirculated cooling water is run through with 475 DEG C of brittle temperature ranges for representative,
Brittlement phase precipitation has been effectively shielded from, guarantee is provided for safety in production；Water-cooled cooling is carried out after the completion of batching, avoids volume
Take temperature directly to set less than 475 DEG C, cause dual phase steel strip to be subcooled, template is bad and galled spots；Meanwhile by strict
The water quality management of water cooling pond, avoid Cooling Process and produce new surface defect.
Claims (10)
1. a kind of stainless steel dual phase steel method for coiling, it comprises the following steps：
Dual phase steel slab after roughing is placed in finishing mill volume stove and carries out finish rolling calendering, obtains the dual phase steel after finish rolling calendering
Strip；
By the finish rolling roll after dual phase steel strip carry out successively section cooling, batch with water cooling pond cool down, be cooled to room temperature
After obtain two-phase product made from steel；
Wherein, the furnace temperature of the finishing mill volume stove is 1000 DEG C -1050 DEG C,
The temperature batched is 450 DEG C -750 DEG C.
2. stainless steel dual phase steel method for coiling according to claim 1, it is characterised in that：The dual phase steel slab includes
2205 steel grades or 2507 steel grades；
Preferably, the coiling temperature of 2205 steel grade is 600 DEG C -750 DEG C；
Preferably, the coiling temperature of 2507 steel grade is 450 DEG C -700 DEG C.
3. stainless steel dual phase steel method for coiling according to claim 2, it is characterised in that：The finish to gauge temperature of the finish rolling calendering
Spend for 1000 DEG C -1050 DEG C；
Preferably, the finishing temperature of the 2205 steel grade finish rolling calendering is 1000 DEG C -1020 DEG C；
Preferably, the finishing temperature of the 2507 steel grade finish rolling calendering is 1010 DEG C -1050 DEG C.
4. stainless steel dual phase steel method for coiling according to claim 2, it is characterised in that：The layer that 2205 steel grade uses
Cool time≤5min is flowed, temperature≤750 DEG C of strip after section cooling.
5. stainless steel dual phase steel method for coiling according to claim 2, it is characterised in that：The layer that 2507 steel grade uses
Cool time≤3min is flowed, temperature≤700 DEG C of strip after section cooling.
6. the stainless steel dual phase steel method for coiling according to claim any one of 1-5, it is characterised in that：The section cooling
Cooldown rate be 500-1300 DEG C/min.
7. stainless steel dual phase steel method for coiling according to claim 1, it is characterised in that：The Cl in the water cooling pond-Content≤
70ppm。
8. stainless steel dual phase steel method for coiling according to claim 1, it is characterised in that：The water cooling pond is cold using circulating
But water cooling, the water temperature in the water cooling pond is 30 DEG C -60 DEG C.
9. stainless steel dual phase steel method for coiling according to claim 1, it is characterised in that：The dual phase sheet steel is in the water
Cooldown rate in cold drop is 1-4.5 DEG C/min, cool time 8h-10h.
10. stainless steel dual phase steel method for coiling according to claim 9, it is characterised in that：350 DEG C -525 DEG C the stage institute
It is 1.5 DEG C/min-4.5 DEG C/min to state cooldown rate of 2205 steel grades in the water cooling pond；Preferably 3.0-4.5 DEG C/min；
Preferably, it is 2.0 DEG C/min- in cooldown rate of 2507 steel grades in the water cooling pond described in 350 DEG C of -525 DEG C of stages
4.5℃/min；Preferably 4.0-4.5 DEG C/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756597A (en) * | 2019-10-17 | 2020-02-07 | 浦项(张家港)不锈钢股份有限公司 | Cooling method for double-phase stainless steel hot-rolled plate strip |
| CN113210428A (en) * | 2021-04-21 | 2021-08-06 | 鞍钢联众(广州)不锈钢有限公司 | Double-phase stainless steel hot-rolling coiling method |
| CN114653750A (en) * | 2022-02-25 | 2022-06-24 | 鞍钢股份有限公司 | Hot rolling process for reducing edge crack of cold-rolled dual-phase steel above 1200MPa |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110756597A (en) * | 2019-10-17 | 2020-02-07 | 浦项(张家港)不锈钢股份有限公司 | Cooling method for double-phase stainless steel hot-rolled plate strip |
| CN113210428A (en) * | 2021-04-21 | 2021-08-06 | 鞍钢联众(广州)不锈钢有限公司 | Double-phase stainless steel hot-rolling coiling method |
| CN113210428B (en) * | 2021-04-21 | 2022-02-25 | 鞍钢联众(广州)不锈钢有限公司 | Double-phase stainless steel hot-rolling coiling method |
| CN114653750A (en) * | 2022-02-25 | 2022-06-24 | 鞍钢股份有限公司 | Hot rolling process for reducing edge crack of cold-rolled dual-phase steel above 1200MPa |
| CN114653750B (en) * | 2022-02-25 | 2024-03-19 | 鞍钢股份有限公司 | Hot rolling process for reducing edge crack of cold-rolled dual-phase steel above 1200MPa level |
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