CN102699028B - Method for eliminating linear edge defects of hot-rolled low-carbon steel - Google Patents
Method for eliminating linear edge defects of hot-rolled low-carbon steel Download PDFInfo
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Abstract
Disclosed is a method for eliminating linear edge defects of hot-rolled low-carbon steel. The method is characterized by comprising following technological processes: step one, heating continuous casting billet; step two, descaling with high-pressure water; step three, using a sizing press for width adjustment; step four, roughly rolling; step five, preserving heat with a thermal insulation cover; step six, heating edges; step seven, cutting heads and tails with a flying shear; step eight, performing finish rolling for descaling; step nine, performing finish rolling; step ten, performing laminar cooling; and step eleven, reeling. The method is further characterized in that a place equal to the continuous casting billet in size is reserved between the continuous casting billet and a furnace outlet when heating the continuous-cast billet at the step one is performed. According to the method for eliminating the linear edge defects of the hot-rolled low-carbon steel, the linear edge defects of the hot-roller low-carbon steel can be eliminated only by adjusting process parameters while modification of production line equipment is not needed, and coexistence region rolling is avoided, so that mixed grain of hot-rolled strip steel is avoided.
Description
Technical field
The invention belongs to hot rolling technique field, particularly, the present invention relates to a kind of removing method of low-carbon hot-rolled steel edge line defect
Background technology
Low-carbon hot-rolled steel, due to the deep drawability of its excellence, can meet the requirement of various complicated moulded products, therefore be used widely in the moulded products such as automobile, household electrical appliances and various instrument and meters.Meanwhile, the requirement of this series products to plate surface quality is also more and more higher, especially vehicle exterior cladding element is often adopted to the steel plate of complete free of surface defects.Therefore, the various blemish occurred in the operation of rolling can have a strong impact on the economic benefit of shaped article quality and enterprise.
Usually there is a kind of edge line defect in the surface of low-carbon hot-rolled steel, such defect is also usually by (Edge Seam Defect) such as title edge cracks, edge black line, edge wire crackles.This defect is mainly distributed in the both sides or one-sided within edge certain distance of sheet material upper and lower surface, is formed and rolls thin-line-shaped or strip of sheet, banded line defect to distribution along steel plate.
Described edge line defect is different in size, and the order of severity differs, or long through entire volume plate, or comes across certain part on steel edge portion length direction.The coils of hot-rolled steel that such defect occurs carry out follow-up cold rolling time, then the surperficial relevant position of cold-reduced sheet can be caused to occur spot, and may bring to wipe to cold roll and scratch.Therefore, in order to ensure that product is normally delivered goods, need before tissue is produced, increase hot rolled plate target finished width, contract for goods is completed by the way of trimming, so not only bring very large difficulty to organization of production, lumber recovery obviously declines simultaneously, directly affects the competitiveness of product in market.
By studying the microscopic observation of edge line defect and the high temperature hot deformation resistance of mild steel, can confirm: the formation mechenism of such defect is in the operation of rolling, because continuous casting billet width temperature is uneven, especially because continuous casting billet corner temperature is too low, this position enters two-phase section phase after deformation, when causing rolling to be spreaded, various piece distortion is uneven, corner parts generation gauffer.Along with spreading in flat rolling process is carried out, the upset of continuous casting billet corner enters upper and lower surface, and constantly moves to continuous casting billet widthwise central, is finally forming the described line defect along rolling to distribution apart from edge certain distance region.
Such defect of current solution has different ways.
Such as, application number is the Chinese utility model patent of " 200720067413.7 ", disclose a kind of continuous cast mold, its technical scheme system is by being set to circular arc by crystallizer minor face plate madial wall, crystallizer four angles are set to fillet, wish that the continuous casting billet cross section after making casting is cydariform, four corner angle are fillet.Continuous casting billet after such casting efficiently avoid the too fast cooling of corner parts in the hot rolling, and the end face of long side plate can evenly cool slowly, makes edge 1 ~ 2 centimeter of place roll the longitudinal strip black line defect expressivity of rear generation.This way is due to larger scrap build, and the impact on continuous casting process, and the enterprise adopting the method to carry out transforming at present is also few.
And for example, " a kind of eliminate IF steel edge in Hot Strip Rolling stick up the method for skin " China that application number is " 201010237117.3 " applies for a patent, thermal modeling test method is adopted to measure IF steel phase transition temperature in the hot rolling, controlled, suitably improve the temperature of steel tapping side by heating furnace pressure-fired, adjustment rolling and de-scaling sequential, the cleaning of roughing and finish rolling de-scaling water utilizes inverse spray to replace side spray, avoid steel edge portion to be subject to washing away of water, by entry temperature at finishing as a control objectives, the edge solving IF steel sticks up skin defect.
For another example, the Chinese invention that application number is " 200810234287.9 ", denomination of invention is " the vertical roll shape design that one improves hot-strip edge impression defect (Slab Edge) " is applied for a patent, and discloses a kind of vertical roll shape design improving hot-strip edge impression defect.This technical scheme is by the roll shape of edger roll by the plain-barreled roll changed into convexity with tapering, and the size of its convexity is 150 ~ 200um, convexity partial design from roll line 0 ~ 135mm place, convexity to play an angle angle be 3 ~ 5 °.According to the program, its advantage is: utilize this roll design can play edger roll the 3rd passage (Pass) continuous casting billet and nip thickness when being 135mm, realize the width compression of edger roll to continuous casting billet both sides thickness direction mid portion, while realizing spreading control, reduce the width of edge impression defect (Slab Edge), improve product casting yield, reduce production cost.While the method effectively reduces defect width, this defect can not be eliminated, and bring the problem of roughing rolling stability.
In addition, also having some documents by improving continuous casting billet tapping temperature, ensureing that the temperature of the operation of rolling does not enter two-phase section, the method may bring the problem of belt steel surface iron scale simultaneously.Develop a kind of new edger roll roll forming in April, 1989, i.e. double tapered angle roll forming (EFM) abroad, new roll forming can improve the distortion of continuous casting billet corner, by reducing variations in temperature and improving fine crack defect, thus alleviates the adverse effect to slit.In addition also have the SP side compression machine by the vertical miller and band convexity being with convexity, be pre-formed concave side edges when side pressure, absolute spread during minimizing flat rolling and slit width, control the distance of edge line defect to steel edge portion effectively.Domestic once by optimizing vertical roll hole and side pressure craftwork, edger roll is arranged to the roll forming being with rounded corner, when roughing, continuous casting billet corner is rolled into rounded corner, variations in temperature can be reduced equally and improve fine crack defect, effectively reduce black line occurrence probability.
Method disclosed in comprehensive above-mentioned document, its main purpose concentrates on the distance controlling edge fault, not yet just eliminates edge line defect and proposes practicable method.
Summary of the invention
For overcoming the problems referred to above, main purpose of the present invention is: provide a kind of method eliminating low-carbon hot-rolled steel edge line defect, eliminate the method for low-carbon hot-rolled steel edge line defect, in the hot rolling according to the present invention, by the adjustment to technique, lower edge temperature drop, prevent continuous casting billet edge from entering two-phase section, utilize existing equipment to eliminate low-carbon hot-rolled steel edge line defect, the method does not need the transformation of carrying out producing line equipment, method is simply applicable, workable, Be very effective.
For meeting above-mentioned technical requirement, the control removing method technical scheme of low-carbon hot-rolled steel edge line defect of the present invention is as follows:
A control removing method for low-carbon hot-rolled steel edge line defect, described method comprises following technological process:
Step one: continuous casting billet heating → step 2: high-pressure water descaling → step 3: fixed-width pressure machine adjusts wide → step 4: roughing → step 5: stay-warm case insulation → step 6: Edge Heating → step 7: flying shear crop end → step 8: finish rolling de-scaling → step 9: finish rolling → step 10: section cooling → step 11: batch;
It is characterized in that, when steps performed one continuous casting billet heats, between continuous casting billet and plug for outlet vacant one piece with the position of continuous casting billet formed objects, the distance namely between continuous casting billet and plug for outlet is the width of one block of continuous casting billet, is directly retracted on furnace delivery table and is rolled after continuous casting billet soaking.
Vacant one piece with the object of the position of continuous casting billet formed objects is: increase continuous casting billet and take out the front distance from fire door of steel, reduce take out at every turn steel door opened time, inside and outside stove, exchange heat causes the temperature of continuous casting billet to reduce, the especially temperature drop of continuous casting billet corner.
According to the removing method of a kind of low-carbon hot-rolled steel edge line defect of the present invention, it is characterized in that, continuous casting billet tapping temperature lower limit is 1220 DEG C.
According to the removing method of a kind of low-carbon hot-rolled steel edge line defect of the present invention, it is characterized in that, after continuous casting billet is come out of the stove, through step 2 high-pressure water descaling, only open one section of de-scaling water nozzle.
According to the removing method of a kind of low-carbon hot-rolled steel edge line defect of the present invention, it is characterized in that, when continuous casting billet enters step 5 roughing, the de-scaling water of roughing porch is closed, the roughing port opening de-scaling water when the first passage roughing; The de-scaling water of follow-up roughing passage is closed.
The object of aforesaid operations is, ensure scale removal effect reduce temperature drop simultaneously as far as possible, and ensure continuous casting billet after de-scaling for some time return temperature, ensure corner and the center temperature difference unlikely excessive.
According to the removing method of a kind of low-carbon hot-rolled steel edge line defect of the present invention, it is characterized in that, after step 5 roughing, the thickness of intermediate blank is more than 45mm.
The thickness of intermediate blank is set to 45mm the above object, being in order to by improving workpiece thickness, reducing roughing each passage time, reducing the temperature drop of rough rolling process.
According to the removing method of a kind of low-carbon hot-rolled steel edge line defect of the present invention, it is characterized in that, before intermediate blank enters mm finishing mill unit, utilize strip edge heater to carry out Edge Heating, make edge temperature improve 40-80 DEG C.
According to the removing method of a kind of low-carbon hot-rolled steel edge line defect of the present invention, it is characterized in that, control mm finishing mill unit interstand cooling water and side spray water, ensure that finish rolling outlet steel edge portion temperature controls to be not less than 920 DEG C.
According to the removing method of a kind of low-carbon hot-rolled steel edge line defect of the present invention, compare the method mentioned in existing patent and document, its advantage is as follows:
(1) low-carbon hot-rolled steel edge line defect can be eliminated, and be not only control the distance of edge line defect from steel edge portion;
(2) do not need to carry out the scrap build of product line, the adjustment by means of only technological parameter just can eliminate low-carbon hot-rolled steel edge line defect.
(3) because temperature drop in its whole operation of rolling is less, the edge finishing temperature that belt steel temperature is minimum all controls more than phase transition temperature, avoids coexistence region rolling, therefore avoids the generation of hot-strip mixed crystal phenomenon.
Accompanying drawing explanation
Fig. 1 production technological process of the present invention.
Fig. 2 takes out steel change in location schematic diagram.
Wherein 1 is heating furnace, and 2 is continuous casting billet, and A is the heating location of continuous casting billet, and B is rest position.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1
According to method of the present invention, 3 kinds of mild steel are rolled, according to steel grades difference, are expressed as: A1, A2, A3.
Continuous casting billet, after heating, carries out high-pressure water descaling, in two sections of water nozzles of high-pressure water descaling case, only opens one section of de-scaling water nozzle near arrival end, closes the de-scaling water nozzle of the port of export.
Adjust wide through the wide side compression machine of toning afterwards, then carry out 2 frame roughing, roughing adopts 1-5 passes, R1 rolling 1 road, R2 rolling 5 road, and carry out de-scaling in R1 outlet, other passage de-scaling water is closed.
Thus, because of in continuous casting billet before rolling short time not by de-scaling water cooling, have enough time to return temperature, ensure corner and middle portion temperature difference little.Meanwhile, workpiece thickness is set as 48mm, reduces the roughing time, reduces rough rolling process temperature drop.
Enter delay table after roughing, delay table is incubated by stay-warm case, then heats up 80 DEG C through strip edge heater to intermediate blank edge, and crop end enters mm finishing mill unit afterwards.
Exit temperature at finishing is 940-950 DEG C, afterwards by batching rolling after section cooling.
Produce 157 volume mild steel as stated above, followed the tracks of and uncoiling hand inspection by online surface quality, in test volume, do not find edge line defect.
Table 1 is main technique setup parameter in embodiment.
Table 1
The method of low-carbon hot-rolled steel edge line defect is eliminated according to the present invention, in the hot rolling, by the adjustment to technique, lower edge temperature drop, prevent continuous casting billet edge from entering two-phase section, utilize existing equipment to eliminate low-carbon hot-rolled steel edge line defect, the method does not need the transformation of carrying out producing line equipment, method is simply applicable, workable, Be very effective.
Claims (6)
1. the control removing method of a low-carbon hot-rolled steel edge line defect, described defect is mainly distributed in the both sides or one-sided apart from edge of sheet material upper and lower surface, formation rolls thin-line-shaped or strip of sheet, the banded line defect to distribution along steel plate, and described method comprises following technological process:
Step one: continuous casting billet heating → step 2: high-pressure water descaling → step 3: fixed-width pressure machine adjusts wide → step 4: roughing → step 5: stay-warm case insulation → step 6: Edge Heating → step 7: flying shear crop end → step 8: finish rolling de-scaling → step 9: finish rolling → step 10: section cooling → step 11: batch
It is characterized in that: when steps performed one continuous casting billet heats, between continuous casting billet and plug for outlet vacant one piece with the position of continuous casting billet formed objects, namely the distance between continuous casting billet and plug for outlet is the width of one block of continuous casting billet, is directly retracted on furnace delivery table and is rolled after continuous casting billet soaking
Control mm finishing mill unit interstand cooling water and side spray water, ensure that finish rolling outlet steel edge portion temperature controls to be not less than 920 DEG C.
2. the control removing method of a kind of low-carbon hot-rolled steel edge line defect according to claim 1, it is characterized in that, continuous casting billet tapping temperature lower limit is 1220 DEG C.
3. the control removing method of a kind of low-carbon hot-rolled steel edge line defect according to claim 1, is characterized in that, after continuous casting billet is come out of the stove, through step 2 high-pressure water descaling, only opens one section of de-scaling water nozzle.
4. the control removing method of a kind of low-carbon hot-rolled steel edge line defect according to claim 1, is characterized in that, when continuous casting billet enters step 5 roughing, the de-scaling water of roughing porch is closed, the roughing port opening de-scaling water when the first passage roughing; The de-scaling water of follow-up roughing passage is closed.
5. the control removing method of a kind of low-carbon hot-rolled steel edge line defect according to claim 1, is characterized in that, after step 5 roughing, the thickness of intermediate blank is more than 45mm.
6. the control removing method of a kind of low-carbon hot-rolled steel edge line defect according to claim 1, is characterized in that, utilize strip edge heater to carry out Edge Heating before intermediate blank enters mm finishing mill unit, makes edge temperature improve 40-80 DEG C.
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