CN102451841B - System and method for cooling high-carbon steel wire rod after rolling - Google Patents
System and method for cooling high-carbon steel wire rod after rolling Download PDFInfo
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- CN102451841B CN102451841B CN201010516305.XA CN201010516305A CN102451841B CN 102451841 B CN102451841 B CN 102451841B CN 201010516305 A CN201010516305 A CN 201010516305A CN 102451841 B CN102451841 B CN 102451841B
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Abstract
The invention discloses a system for cooling a high-carbon steel wire rod after rolling. The device comprises a Stelmor controlled cooling device and a gas fog pre-heating device, wherein the gas fog pre-heating device is arranged on a roller path between a laying head and the Stelmor controlled cooling device. The invention further discloses a method for cooling a high-carbon steel wire rod after rolling. The method comprises the following steps of: controlling the temperature difference among different areas of a rod body to be below 100 DEG C by using the high thermal conductivity of convection vapor during gas fog pre-cooling; and entering the Stelmor controlled cooling device at the temperature of 650-750 DEG C for performing Stelmor cooling. Compared with a wire rod subjected to salt treatment, the finally obtained wire rod in the invention has the advantages that: the mechanical performance and microscopic structure are very close, the tensile strength of cold drawing can be met, and environmental pollution is greatly lowered.
Description
Technical field
The present invention relates to wire rod cooling technology, more particularly, relate to a kind of cooling high-carbon steel wire rod after rolling and method.
Background technology
At present, existing high-carbon steel wire rod rolls rear process for cooling two kinds, and one is stelmor control cooling means, and another kind is salt bath treatment process.The former is the most popular in the world, also be the most widely used, it is by the allocation of the amount of air in air quantity and adjusting and the perpendicular direction of wire rod traffic direction of adjusting cooling blower, aid in wire rod falling device and the speed difference of roller-way on the same group not, control microscopic structure and the performance of wire rod, although it is little to ambient influnence, the high-carbon steel wire rod that only can meet General Requirements is produced, and cannot the higher high-performance wire rod of production tensile strength.And the latter be the whole world only Nippon Steel Corp have, the mechanical property of the high-carbon steel wire rod of its production and microscopic structure are better than the former really, but it exists serious environmental pollution.
In addition, in order to improve existing stelmor Controlled cooling process, also once considered to strengthen the cooling air quantity of its cooling blower, hypothesis has enough cooling air quantities, is in theory can produce tensile strength higher than original stelmor technique and approach the wire rod of salt bath process.But, during due to actual production, wire rod on roller-way to be distributed in theoretical case variant, refer to shown in accompanying drawing 1, wire rod 2 dual-side portions after Laying head 1 rolls are also irregular even, and the suffered inhomogeneous cooling in the each region of wire rod 2, particularly overlaps region H Outboard Sections wire rod undercooling, cause the microscopic structure fluctuation on cooling rear whole wire rod 2 pokers very large, the ratio of upper bainite is very high.Therefore, although which can make the mechanical property of wire rod approach salt bath processing,, the wire broken rate in postorder Cold Drawing Process will be far away higher than the wire rod of common stelmor technique or salt bath explained hereafter.
Summary of the invention
For the above-mentioned shortcoming existing in prior art, the object of this invention is to provide a kind of cooling high-carbon steel wire rod after rolling and method, in order to improve mechanical property and the microscopic structure of wire rod, and reduce the pollution to environment.
For achieving the above object, the present invention adopts following technical scheme:
On the one hand, cooling high-carbon steel wire rod after rolling comprises the stelmor control cooling device of being located at Laying head outlet side, also comprise aerosol pre-cooler, be located on the roller-way between Laying head and stelmor control cooling device, the wire rod overlap joint region winding-up aerosol spuing to Laying head carries out cooling, and the surperficial steam blanket that forms forced convertion of the wire rod in overlap joint region, in order to the temperature difference in the each region of disk body is controlled at below 100 ℃, and the temperature that disk body enters stelmor control cooling device is controlled to 650 ~ 750 ℃.
Described aerosol pre-cooler comprises two aerosol jet pipes that are symmetricly set on roller-way top, every aerosol jet pipe forms by inside and outside sleeve pipe, and outer tube is connected with blower fan, interior blowing air, in inner sleeve, be connected with deionization cooling water, inside and outside sleeve pipe lower end is equipped with several nozzles.
The nozzle diameter of described inner sleeve is 0.5 ~ 1.5mm, and ejection flow is 0 ~ 0.8m
3the deionization cooling water of/h; In described outer tube, blowing air flow is 600 ~ 1000m
3/ h, and mix with the rotation of deionization cooling water, and the outer tube nozzle that is 5 ~ 10mm by diameter, the aerosol of ejection 30 ~ 100um.
The spray angle of described aerosol jet pipe is downward-sloping 20 ~ 40 °, and the length that aerosol jet pipe is arranged along roller-way is 1.5 ~ 3m.
This cooling system also comprises infrared imaging temperature measuring equipment, the wire rod that enters aerosol pre-cooler and stelmor control cooling device is carried out to temperature field measurement, in order to calculate the required intensity of cooling of wire rod distribution zones of different, and the amount of cooling water of aerosol pre-cooler is adjusted accordingly.
On the other hand, to roll the concrete steps of rear cooling means as follows for a kind of high-carbon steel wire rod:
A., a set of aerosol pre-cooler is set on Laying head outlet side roller-way, and a set of stelmor control cooling device is set after aerosol pre-cooler;
B. the wire rod overlap joint region H winding-up aerosol spuing to Laying head by aerosol pre-cooler carries out cooling, and on the wire rod surface of wire rod overlap joint region H, form the steam blanket of forced convertion, in order to the temperature difference in the each region of disk body is controlled at below 100 ℃, and the temperature that disk body enters stelmor control cooling device is controlled to 650 ~ 750 ℃;
C. by stelmor control cooling device, the wire rod after to precooling carries out stelmor cooling;
D. adopt infrared imaging temperature measuring equipment, the wire rod that enters aerosol pre-cooler and stelmor control cooling device is carried out to temperature field measurement, in order to calculate the required intensity of cooling of wire rod distribution zones of different, and the amount of cooling water of aerosol pre-cooler is adjusted accordingly.
In steps A, described aerosol pre-cooler adopts two aerosol jet pipes that are symmetrically set on roller-way, to the aerosol of wire rod winding-up 30 ~ 100um in order to cooling.
Described aerosol jet pipe adopts inside and outside sleeve pipe to form, and outer tube is connected with blower fan, and passing into flow is 600 ~ 1000m
3the air of/h, in inner sleeve, passing into flow is 0 ~ 0.8m
3the deionization cooling water of/h, and offer respectively in inside and outside sleeve pipe lower end the nozzle that diameter is 0.5 ~ 1.5mm, 5 ~ 10mm.
The spray angle of described aerosol jet pipe is set to downward-sloping 20 ~ 40 °, and the length that aerosol jet pipe is arranged along roller-way is set to 1.5 ~ 3m.
In technique scheme, cooling high-carbon steel wire rod after rolling of the present invention and method, comprise stelmor control cooling device and aerosol pre-cooler, aerosol pre-cooler is located on the roller-way between Laying head and stelmor control cooling device, utilize the high-termal conductivity of convection current steam in aerosol precooling, the temperature difference in the each region of disk body is controlled at below 100 ℃, and with the temperature of 650 ~ 750 ℃, enter stelmor control cooling device and carry out stelmor cooling, the wire rod of final gained is compared with salt bath processing, mechanical property and microscopic structure are very approaching, and can meet the tensile strength of cold-drawn, but the pollution to environment reduces greatly.
Accompanying drawing explanation
Fig. 1 is the distribution top view of wire rod on roller-way in traditional stelmor Controlled cooling process;
Fig. 2 is the schematic diagram of cooling high-carbon steel wire rod after rolling of the present invention;
Fig. 3 is the longitudinal section view of aerosol jet pipe of the present invention;
Fig. 4 is the flow chart that high-carbon steel wire rod of the present invention rolls rear cooling means;
Fig. 5 is the cooling schematic diagram that forms steam blanket on wire rod limit portion surface of aerosol of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples, further illustrate technical scheme of the present invention.
Refer to shown in Fig. 2, cooling high-carbon steel wire rod after rolling of the present invention comprises the stelmor control cooling device 10 of being located at Laying head 1 outlet side, in order to carry out stelmor cooling (its structure and cooling principle and traditional stelmor cooling are basic identical, do not repeat them here) to entering wire rod 1 in its region.This cooling system also comprises aerosol pre-cooler 20, be located on the roller-way 3 between Laying head 1 and first cooling blower 11 of stelmor control cooling device 10, the overlap joint region H winding-up aerosol of the wire rod 2 spuing to Laying head 1 carries out cooling, and at the surperficial steam blanket that forms forced convertion of the wire rod that overlaps region H, in order to the temperature difference in disk body 2 each regions is controlled at below 100 ℃ from original 200 ℃, and the temperature that disk body 2 enters stelmor control cooling device 10 is controlled to 650 ~ 750 ℃.
Shown in Fig. 3, this aerosol pre-cooler 20 comprises two aerosol jet pipes that are symmetricly set on roller-way 3 tops, every aerosol jet pipe forms by inside and outside sleeve pipe 21,22, outer tube 22 is connected with blower fan, interior blowing air, in inner sleeve 21, be connected with deionization cooling water, inside and outside sleeve pipe 21,22 lower ends are equipped with several nozzles 211,221.Nozzle 211 diameters of inner sleeve 21 are 1.0mm, and ejection flow is 0.43m
3the deionization cooling water of/h; The interior blowing air flow of described outer tube 22 is 900m
3/ h, and mix with the rotation of deionization cooling water, and the outer tube nozzle 221 that is 20mm by diameter, the aerosol of ejection 30 ~ 100um.And aerosol jet pipe is aimed at the overlap joint region H of wire rod 2, spray angle is downward-sloping 20 °, and the length that aerosol jet pipe is arranged along roller-way 3 is 2m, and whole wire rod 2 is 1.5s by the time (being the pre-cooled time) of aerosol pre-cooler 20.
In addition, this cooling system also comprises that infrared imaging temperature measuring equipment is (not shown, the product that the model that can adopt FLIR company is P620) wire rod that enters aerosol pre-cooler 20 and stelmor control cooling device 10 is carried out to temperature field measurement, by controlling cold model, calculate the required intensity of cooling of wire rod distribution zones of different, thereby for the amount of cooling water of aerosol pre-cooler 20 is adjusted accordingly, be conducive to optimize cooling effect.The cold model of above-mentioned control is the universal computer model in thermal conduction study field, does not repeat them here.
At this, it should be noted that, in aerosol precooling, choice for use blower fan passes into air and does not select compressed-air actuated reason to be: because the relative blower fan air pressure of compressed air is high, air mass flow cannot reach the air quantity that blower fan produces.And enough air quantity are the necessary conditions that realizes forced convertion, existing industrialized compressed air maximum stream flow also cannot reach 500m
3air mass flow requirement more than/h.Shown in Fig. 5, after adopting the air of above-mentioned flow to mix with deionization cooling water, be injected into wire rod 2 limit portions surfaces and form following three regions:
Outermost layer a, is air and water droplet mixed zone, and its major function is that water droplet is added to intermediate layer b continuously, and takes away the heat from intermediate layer;
Intermediate layer b, bit position water droplet starts gasification, forms the mixed zone of air, water droplet, steam, and its major function is to absorb the heat from innermost layer c in a large number by the gasification of water;
Innermost layer c, because water droplet directly contacts with wire rod 2 limit portions, is gasified totally, forms vapor film.Because steam is that dynamic equilibrium generates, while flow at high speed again, therefore forms forced convertion cooling, utilizes its high thermal conductivity coefficient (this thermal conductivity factor average out to 10000W/(m2. K), 150 times of Forced Convection Air thermal conductivity factor), rapidly the surface temperature of wire rod limit portion is taken away.Simultaneously, due to the dynamic formation of vapor film, the temperature of vapor film is remained at and be not less than 600 ℃, thereby guaranteed that wire rod enters the temperature requirement of stelmor control cooling device 10, also guaranteed that high temperature wire rod surface can Quench and produce abnormal microscopic structure.
Shown in Fig. 4, the key step that this high-carbon steel wire rod rolls rear cooling means is as follows:
A., a set of aerosol pre-cooler is set on the roller-way of Laying head outlet side, and a set of stelmor control cooling device is set after aerosol pre-cooler 20;
B. the wire rod dual-side portion winding-up aerosol spuing to Laying head by aerosol pre-cooler carries out cooling, and at the surperficial steam blanket that forms forced convertion of wire rod limit portion, in order to the temperature difference in the each region of disk body is controlled at below 100 ℃, and the temperature that disk body enters stelmor control cooling device is controlled to 650 ~ 750 ℃;
C. by stelmor control cooling device, the wire rod after to precooling carries out stelmor cooling;
D. adopt infrared imaging temperature measuring equipment, the wire rod that enters aerosol pre-cooler and stelmor control cooling device is carried out to temperature field measurement, in order to calculate the required intensity of cooling of wire rod distribution zones of different, and the amount of cooling water of aerosol pre-cooler is adjusted accordingly.
The detail of this cooling means and requirement are identical with cooling device essence, do not repeat them here.
By embodiment, the present invention is carried out to concrete example explanation below:
Take the SWRH82B high-carbon steel wire rod of producing Φ 6mm as example, when wire rod is entered by Laying head behind aerosol precooling region, cooling water valve is automatically opened and is started blower fan, makes deionization cooling water 0.43m
3/ h flow is from the inner sleeve nozzle ejection of Φ 1mm, with 900h
3/ h(and the above-mentioned 1000m that reaches
3more than/h air mass flow requires not to be inconsistent) blower air of flow produces rotation and mixes, then spray together from the outer tube nozzle of Φ 3mm.Due to the poor principle of gas velocity, water droplet is atomized into the aerosol of 60um, and aerosol is jetted to the overlap joint region H of wire rod with 20 ° of oblique angles, carries out aerosol precooling.Through measuring, the surface temperature of the wire rod zones of different after precooling is poor is reduced to 90 ℃ from original 260 ℃, in the wire rod surface temperature of first cooling blower that enters stelmor control cooling device 10, is 660 ℃.Finally, through the SWRH82B of stelmor cooling gained high-carbon steel wire rod, by metallographic microscope and scanning electron microscopic observation analysis and contrast, the ratio of the microscopic structure medium pearlite of this wire rod is far fewer than the wire rod that adopts traditional stelmor cooling gained, almost as broad as long with the wire rod of salt bath processing, and the same upper bainite tissue of all not finding of wire rod with salt bath processing, therefore has good mechanical property, has better tensile strength in cold-drawn.
In sum, adopt wire rod that cooling device of the present invention and method produce compared with salt bath processing, mechanical property and microscopic structure are very approaching, and can meet the tensile strength of cold-drawn, but the pollution of environment is reduced greatly.In addition, conveniently transformation and the upgrading to the cooling production line of existing most stelmor control, cost is less, and product quality is high, Benefit.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and be not used as limitation of the invention, as long as within the scope of connotation of the present invention, variation, modification to the above embodiment all will drop within the scope of claims of the present invention.
Claims (4)
1. a cooling high-carbon steel wire rod after rolling, comprises the stelmor control cooling device of being located at Laying head outlet side, it is characterized in that:
Also comprise aerosol pre-cooler, be located on the roller-way between Laying head and stelmor control cooling device, overlap joint region, the wire rod both sides winding-up aerosol spuing to Laying head carries out cooling, and the surperficial steam blanket that forms forced convertion of the wire rod in this region, in order to the temperature difference in the each region of disk body is controlled at below 100 ℃, and the temperature that disk body enters stelmor control cooling device is controlled to 650～750 ℃;
Described aerosol pre-cooler comprises two aerosol jet pipes that are symmetricly set on roller-way top, every aerosol jet pipe forms by inside and outside sleeve pipe, and outer tube is connected with blower fan, interior blowing air, in inner sleeve, be connected with deionization cooling water, inside and outside sleeve pipe lower end is equipped with several nozzles;
The nozzle diameter of described inner sleeve is 0.5～1.5mm, and ejection flow is 0～0.8m
3the deionization cooling water of/h; In described outer tube, blowing air flow is 600～1000m
3/ h, and mix with the rotation of deionization cooling water, and the outer tube nozzle that is 5～10mm by diameter, the aerosol of ejection 30～100um;
This cooling system also comprises infrared imaging temperature measuring equipment, the wire rod that enters aerosol pre-cooler and stelmor control cooling device is carried out to temperature field measurement, in order to calculate the required intensity of cooling of wire rod distribution zones of different, and the amount of cooling water of aerosol pre-cooler is adjusted accordingly.
2. cooling high-carbon steel wire rod after rolling as claimed in claim 1, is characterized in that:
The spray angle of described aerosol jet pipe is downward-sloping 20 °～40 °, and the length that aerosol jet pipe is arranged along roller-way is 1.5～3m.
3. high-carbon steel wire rod rolls a rear cooling means, it is characterized in that,
The concrete steps of this cooling means are as follows:
A., a set of aerosol pre-cooler is set on Laying head outlet side roller-way, and a set of stelmor control cooling device is set after aerosol pre-cooler;
Described aerosol pre-cooler comprises two aerosol jet pipes that are symmetricly set on roller-way top, every aerosol jet pipe forms by inside and outside sleeve pipe, and outer tube is connected with blower fan, interior blowing air, in inner sleeve, be connected with deionization cooling water, inside and outside sleeve pipe lower end is equipped with several nozzles;
The nozzle diameter of described inner sleeve is 0.5～1.5mm, and ejection flow is 0～0.8m
3the deionization cooling water of/h; In described outer tube, blowing air flow is 600～1000m
3/ h, and mix with the rotation of deionization cooling water, and the outer tube nozzle that is 5～10mm by diameter, the aerosol of ejection 30～100um;
The overlap joint region winding-up aerosol of the wire rod both sides that B. spue to Laying head by aerosol pre-cooler carries out cooling, and the surperficial steam blanket that forms forced convertion of the wire rod in overlap joint region, in order to the temperature difference in the each region of disk body is controlled at below 100 ℃, and the temperature that disk body enters stelmor control cooling device is controlled to 650～750 ℃;
C. by stelmor control cooling device, the wire rod after to precooling carries out stelmor cooling;
D. adopt infrared imaging temperature measuring equipment, the wire rod that enters aerosol pre-cooler and stelmor control cooling device is carried out to temperature field measurement, in order to calculate the required intensity of cooling of wire rod distribution zones of different, and the amount of cooling water of aerosol pre-cooler is adjusted accordingly.
4. high-carbon steel wire rod as claimed in claim 3 rolls rear cooling means, it is characterized in that:
The spray angle of described aerosol jet pipe is set to downward-sloping 20～40 °, and the length that aerosol jet pipe is arranged along roller-way is set to 1.5～3m.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20160230246A1 (en) * | 2013-10-29 | 2016-08-11 | Nippon Steel & Sumitomo Metal Corporation | Wire rod cooling device and wire rod cooling method |
| CN104275366A (en) * | 2014-09-23 | 2015-01-14 | 南京钢铁股份有限公司 | Method for controlling oxide iron scale on surface of low-carbon steel hot rolled wire rod |
| CN104550262A (en) * | 2014-12-15 | 2015-04-29 | 首钢总公司 | Method for controlling simulation of cooling speed of high-speed wire Stelmor air cooling line |
| CN104438384B (en) * | 2014-12-23 | 2016-05-25 | 江苏东方成套设备制造有限公司 | Valve snail is rolled rear cooling device |
| CN104550275B (en) * | 2014-12-26 | 2016-07-06 | 钢铁研究总院 | A kind of spray vaporization chiller for hot-rolled high-strength reinforcing bar and method |
| CN104707875A (en) * | 2015-04-07 | 2015-06-17 | 冯宗茂 | Dislocation wire lap joint point device |
| CN107525322A (en) * | 2017-09-14 | 2017-12-29 | 德清宏晨铸造有限公司 | A kind of high-carbon steel production atomization air cooling equipment |
| CN108889784A (en) * | 2018-06-08 | 2018-11-27 | 徐超 | Cooling method of steel pipe |
| CN110626770A (en) * | 2018-06-25 | 2019-12-31 | 安徽省宁国市宁星耐磨材料有限公司 | Alloy steel casting unpowered conveying device and conveying method thereof |
| CN109351786B (en) * | 2018-11-20 | 2020-03-31 | 张家港宏昌钢板有限公司 | Method for improving consistency of wire rod tissue based on infrared thermal imaging technology |
| CN111250555B (en) * | 2020-01-21 | 2021-07-16 | 江苏省沙钢钢铁研究院有限公司 | Cooling device for acid-washing-free welding wire steel wire rod and using method |
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| KR100995597B1 (en) * | 2003-06-24 | 2010-11-22 | 주식회사 포스코 | Hot Rolled Wire Rod Cooling Apparatus |
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| CN1603021A (en) * | 2004-10-28 | 2005-04-06 | 鞍山科技大学 | Stelmo line gas spray cooling device and method for high-speed wire rod mill |
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