CN1139595A - Method and device for cooling hot-rolled shaped material - Google Patents
Method and device for cooling hot-rolled shaped material Download PDFInfo
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- CN1139595A CN1139595A CN96104086A CN96104086A CN1139595A CN 1139595 A CN1139595 A CN 1139595A CN 96104086 A CN96104086 A CN 96104086A CN 96104086 A CN96104086 A CN 96104086A CN 1139595 A CN1139595 A CN 1139595A
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- 238000001816 cooling Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 61
- 239000000463 material Substances 0.000 title claims description 59
- 230000008569 process Effects 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 230000009466 transformation Effects 0.000 claims abstract description 12
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 4
- 239000002826 coolant Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 150000001412 amines Chemical class 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000003570 air Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 235000019628 coolness Nutrition 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 4
- 229910001562 pearlite Inorganic materials 0.000 abstract description 4
- 210000002683 foot Anatomy 0.000 description 29
- 238000005452 bending Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000005855 radiation Effects 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- -1 drying with steam Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000000689 upper leg Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
- C21D2221/02—Edge parts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Metal Rolling (AREA)
- Control Of Heat Treatment Processes (AREA)
- Control Of Metal Rolling (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Process and equipment for cooling hot rolled sections from rolling heat,where there have parts of differing mass (1 - 5) distributed over their cross section, e.g. rail sections, whereby radiant heat sensors (30 - 32) in conjunction with a computer (40) and appropriate program are used to establish the heat to be abstracted from each of the section parts (10 - 12) according to mass (1 - 5) and temperature and the volume of cooling media (48) required therefore, followed by controlled cooling of the differing section parts (10 - 12) such that the transformation lines (Ar3 / Ar1) in the change from the gamma phase to ferrite and / or pearlite with release of transformation heat are reached as quickly as possible.
Description
The present invention relates to the cooling bed method that hot-rolled profile is cooled off of a kind of usefulness, wherein remove its rolling heat.This section bar is by the section bar position that has spacing to distribute on its cross section, and has that the rail material of different quality constitutes.This invention also relates to the used device of this method of enforcement.
In cooling bed, the temperature of rail material is cooled to below 80 ℃ owing to remove rolling heat.Because therefore the asymmetric distribution of the quality of section bar produces different cooling means between rail head (top) and foot (end).Wherein, therefore foot, cools off than rail head quickly owing to have bigger area of dissipation.Can obtain a result thus, promptly when cooling rail material, can produce twist and warping.Handle by still red-hot rail material being carried out prebuckling, in certain limit, can tackle above-mentioned because the twist and warping that cooling processing caused.Yet this just needs shortcoming, insecure and expend very big thermal flexure treatment process.Therefore, in all cases, all must make cooled rail material carry out the back straightening processing.In cooling procedure, or particularly in the aligning process, can produce characteristic stress in the rail material, this can produce adverse influence to its intensity.For this reason, people have proposed many recommendation on improvements, to solve an above-mentioned difficult problem effectively.
German patent application DE4237991A has described the cooling means to the heat rolling-forming rolled piece on rolling support, particularly in cooling bed, with free convection wind or pressure wind the rail material is carried out the air cooling.The content of this invention is: the rail material that its rail head is hung down is transported to cooling bed top.Take this measure will make heat conduction situation favourable variation occur in the free convection air cooling.Promptly in the temperature difference between rail head and the foot by about 140 ℃ that are keeping flat on the rail material, on the hanging rail material, then can drop to about 50 ℃.Because reducing of the temperature difference between rail head and the foot will reduce the above-mentioned unfavorable twist and warping degree that produces in cooling procedure,, the enough straighteners of energy finally obtain straight rail material so that handling finished product.So just make the final stress in the rail material reach very little degree.
German patent DE-PS2161704 has described the cooling means and the device that do not produce stress and bending of the rail material that railway is used.This summary of the invention is: make the foot of rail material of the hardness equilibrium of desire cooling become disymmetry ground, and supporting ground mutually, foot to foot be clamped together, and with cross conveyor transport to cooling bed on.Though each rail head and foot have quality about the same.Yet, about the volume size of foot but is twice than rail head.The surrounding area of the foot that therefore, is clamped together and the ratio of its quality approximately are same as the surrounding area of rail head and the ratio of its quality.Rail head and foot are cooled off uniformly.As confirming that in practice the processing mode of this one-tenth foot two and that support mutually can realize producing hardly crooked cooling.
U.S. Pat 468788 discloses a kind of cooling means of rail material, and wherein the rail material that hangs down of its rail head in the handle assembly completely or partially is immersed in the water-filled treatment trough, and cools off.Meanwhile, use clamping device with its compressing and be fixed on the bearing.
German patent DE-PS404127 also discloses a kind of metal bar that will have asymmetric cross section, is particularly useful for the rail material on the railway, the method for aligning.The content of this invention is: the bar that its cross section is thicker partly is subjected to the domination of this artificial cooling processing, though the each several part sectional area of bar is different, has all shunk separately.This bar still keeps Bi Zhi when bar is cooled to be incubated.Will obtain such result like this, promptly above-mentioned artificial cooling is by being immersed in the liquid, and by soaking or spraying, by using spray form liquid, drying with steam, air or other gas forms.Wherein in whole process or only in one section cooling procedure, make above-mentioned used medium continuously or have discontinuously and work.It should be noted that in the present invention this artificial cooling can be to handle like this, promptly when this bar be during by hard steel or hardenable alloy composition, the negative interaction of quenching not in cooling procedure.
German patent DE-PS1942929 discloses a kind of cooling means of rail material, wherein is as the basis with other physics principle.This invention is, reaching before the austenite transformation temperature, deposits this rail material, makes its foot side by side, and is separated with spacing with heat-reflecting layer.In addition, proceed cooling procedure, will on the work tyre surface of rail material, apply firm insulating materials.In addition, can make this method reach active influence by radiation effects.Promptly the rail material is directly deposited side by side, so that make the foot contacts side surfaces.This measure can cause the positive impact of the cooling process in a part of rail material cross section, promptly owing to the reflex of reflecting layer on work top and insulating coating is not changeed outside the conveying.In rail material cross section favourable stress equilibrium has taken place like this.Reaching before austenite-transition temperature, deposit this rail material, make its foot side by side, and be separated with spacing with heat-reflecting layer, this practice can produce effect.Be that it can prevent to take place too early austenite-transformation in foot and rail thigh.The technology index that so just can make the rail materials/substances individually that is to say according to the steel analysis, determines the influence that it is subjected to temperature parameter.Thus, can obtain higher intensity, pin expands and is worth and shrinkage value.
Too fast cooling processing in contrast, discloses, owing to can make rail head generation through heating according to French Patent (FRP) FR-PS543461.Promptly foot is upwards hung up, and made rail head in water-filled treatment trough, carry out a series of impregnation process process in a short period of time.
All there is common shortcoming in above-mentioned certain methods.They more or less all are based upon on the basis of experience.That is to say, at first must do time consuming test.Research which parameter in the implementation process of method must be measured, so that guarantee desirable cooling effect, for this reason, at least to the hot rail section bar test specimen of every batch, before the result of the test of the satisfaction that does not obtain as yet making, need repeat test, will cause the appearance of waste product material time and again like this.
Proposed task of the present invention on the basis of above-mentioned prior art, promptly cooling means and the device at the relevant hot-rolled profile of the aforementioned part of claim 1 of the present invention improves.Through after improving, above-mentioned problems of the prior art and disadvantage are solved and overcome, promptly, can obtain not produce the cooling effect of bending, and can not form scrap metal thus through expensive gold and the cooling test of removing rolling heat of time.
Can address the above problem with method of the present invention.At first, use the measuring technique device also to adopt computer together.By calculation procedure,,, record and calculate the heat that it desires to remove respectively according to the ratio of its quality and temperature to different section bar positions.So just can calculate and know the supply of needed cooling medium.Set about different section bar positions, and the cooling of control is arranged according to its different quality.Make them separately with as far as possible little time difference, in the decay of ferrite and/or pearlitic gamma (γ)-mixed crystallization, discharge the transformation heat, reach transformation line A γ
3/ A γ
1
This method has so significant superiority, promptly pass through different in batches, and after the not capital-intensive test, obtain making section bar not produce the cooling effect of bending with just can having no contrary opinion.
In addition, method of the present invention also has other practices, promptly can also continue to be cooled to give fixed final temperature from transition temperature.Make the mass cg of differential profiles, can in as far as possible little time difference, reach final temperature.This measure is guaranteed not produce bending in the cooling processing process of rail material, and reaches the uniform best quenching heat treatment situation of hardness on its transverse section of section material.
When the heat that the desire of measuring calculating section bar position is removed, also should suitably consider transition temperature as the steel product quality sign.
Another practice of the inventive method is when rolling section bar or its part are cooled off, and adopts water as cooling medium.Measure its heat exchange value according to different section bar cross-sections surfaces, and be identified for cooling off the supply of the needed cooling medium in section bar surface in view of the above in advance.It can avoid expending test material, time-consuming process of the test again.
Another favourable practice again of the inventive method is that the rail material that its rail head hangs down is transported to cooling bed top.Wherein controlledly cool off different mass cgs with free convection wind at least in part, and according to the quality at each position of rail material and the ratio of temperature, add additional cooling medium, so as by share extract the heat at each position of section bar.The degree of the bending that is produced in the time of will reducing the cooling section bar like this, and can not need the back straightening processing fully, or, only need slight straightening processing for fear of harmful stress effect.
For this reason, to each position of section bar directionally, and preferably spray cooling medium discontinuously, to remove the heat in the section bar.
In order to compensate the accidental temperature wedge that is present on the profile length.Can also take next step practice, promptly, need carry out different reinforcement cooling processing rolling section bar from the angle of mill length.Can be immersed in each section bar position of whole rolling section bar or its in cooling medium, once or by carrying out cooling processing predetermined cycle time over and over again, so that finally controlledly remove heat wherein.
For implementing method of the present invention, we have designed following device, promptly, preferably settled with interval to be used to measure different section bar positions along stocking length on rail material next door, and as rail head, the thermal-radiating device of rail amine or foot.This device interrelates by data conduction device and a computer.Then, data that measure from each section bar position and quality are input to the computer by importing a data conduction device, and compiled program is so that obtain the product of relevant temperature and quality, according to the ratio of these products, by the feeding device of signal conduction device control cooling medium.
The advantage of apparatus of the present invention is cooling bedly have and can control, and can provide different cooling mediums, as the feeding device of water, air, water/air blending agent.
Be described in further detail method of the present invention and implement the device of this method with following accompanying drawing.
Accompanying drawing 1 cools off the time-temperature (ZTU) that is obtained continuously to the rail body and concerns chart.
Accompanying drawing 2 is inserted the cutaway view of the rail material of thermocouple.
Accompanying drawing 3 is during with free convection air cooling rail spare, according to the curve map of reflection cooling process on each measuring point among Fig. 2.
Accompanying drawing 4 is according to the curve map of cooling process of the present invention.
Accompanying drawing 5, the simple and easy schematic diagram of cooling device.
Fig. 1 has shown that the various cooling elapsed time-temperature (ZTU) on different cross section parts concern chart.According to its quality and under the different time ratio of its temperature center of gravity, obtained transformation line Ar.In the time course between 40 seconds and 120 seconds tangible time difference has appearred wherein.Top chart relates to the steel with following metallurgical composition.Its components by weight percent is C=0.63, Si=0.29, Mn=1.72, P=0.020, S=0.027, Cr=0.099.This steel through 5 minutes heating process after, can be with austenitizing under 950 ℃ of temperature conditions of calm time of 15 minutes.
In Fig. 1, A represents austenite
P represents pearlite
Zw represents to become district's (interstage)
M represents martensite
Can obviously see by curve among the figure, in that down heating will austenitizing after 5 minutes at 950 ℃ with test specimen.Under lower cooling velocity, in the temperature of determining with can reach Ar in cool time
1Line.Under higher cooling velocity, owing to change inertia area, these steel can not obtain the pearlite line, and are transformed into limited proportionality (sterile body) at a lower temperature.Perhaps under still higher cooling velocity, at first obtain martensite line (about 260 ℃).In order to make among the figure polishing of curve perfect, the hardness number HV that under insulation, measures
2(N/mm
2) be recorded in the circle as footnote of each curve.
As everyone knows, cooling off steel and reaching Ar
3And Ar
1In the transformation line, because the gamma (γ in ferrite and the pearlite
1) decay of mixed crystal can discharge so-called transformation heat.When obtaining eutectic point (C=0.86%), change heat along with the phosphorus content that increases is raised to peak.
According to cooling velocity and phosphorus content, make the heat that discharges up to 90KJ/kg.Simultaneously its length increases approximately 0.3% in transition process, and we suppose that the plastic deformation of the asymmetric section bar in cooling bed preponderates in above-mentioned conversion stage.So, in making the temperature average process of cross section, at first the terminal of bed has got obviously making but in the bending of section bar.Continuous therewith (intrinsic) characteristic stress that closes is not because the aligning face can complete obiteration.The example of the rail material of applicable this process as detailed below.
In the process that the rail material after rolling is cooled off, this foot (among Fig. 5 12) since its less quality with and for quality bigger radiation surface area, at first reach turning guide marking Ar
3/ Ar
1, and begin to increase.This length variations can cause rail head (among Fig. 5 10), though it still is in the state of austenite region, and a kind of extension of plasticity.After changing, this foot (12) descends with temperature and shrinks.Rail head (10) is but because its less intensity is unaffected basically, and distortion slightly by compression.If rail head (10) reaches transformation line Ar
3/ Ar
1The time, will begin because transition process causes the growth of length.Yet this length growth can be by the foot (12) of the cooling that changed, and the yield limit in this temperature range is obviously higher, and is constrained, so that the also soft rail head of moulding (10) generation plastic deformation.That is to say, be compressed distortion.When the temperature on the rail material cross section in the cooling bed terminal reached balance, this rail material began to be out of shape by compression at it, and bent on the rail head (10) that for this reason shortens.On long rail material, take place above-mentioned crooked can be so big carry so that continue it is gone up toward cooling bed (50), and and then it penetrated on the straightener and significant difficulties will occur.
Implement as described below according to cooling means of the present invention to the processing example of rail material:
Fig. 2 has shown approximately the sectional view that shows the rail material that size is described by real.Wherein inserted thermocouple separately on each position in the drawings by the 1-5 demonstration.This rail material test specimen is put into 1000 ℃, stove in carry out austenitizing.Then, with free convection wind it is cooled off.Be recorded in the cooling situation that measures on each measuring point 1-5, and describe with curve.
The cooling process that on each curve that Fig. 3 shows has been represented each measuring point 1-5 in Fig. 2, has measured.Can obviously be seen having only with free convection air cooling rail head (10), and do not adding under the situation of other coolings by curve map, mass cg (4) process of foot (12) just reached Ar in about 6.5 minutes later on
3/ Ar
1Line, and just be through with through 10 minutes later these transition processes.
The mass cg (1) of rail head (10) at first began later at about 8.5 minutes to change, and just finished later at 12 minutes.At this moment carve cold about 100 ℃ of foots (12) than rail head (10).And has a higher high temperature yield limit.For this reason, the length of the rail head relevant with transition process (10) increases, and completely or partially is subjected to constraining of foot (12), and makes rail head (10) that plastic deformation take place.That is to say, be compressed distortion.In the rail material that is cooled, go up significantly bending of appearance at rail head (10).We can estimate by computer program, should remove what heat from rail head (10), so that guarantee in the same time, reach commentaries on classics hydrocarbon line Ar as foot (12)
3/ Ar
1Considered transformation heat here according to relevant steel (0.8%C) of the present invention.According to calculating, except rail head (10) being carried out the free convection air cooling also additionally water sprinkling cooling.
Result of the test is just as the family of curves described at the chart of Fig. 4.Wherein, two curves 4 and 1 reach transition temperature T
4-T
1Time difference 25 seconds only.This means that rail head (10) and foot (12) reach Ar approximately simultaneously
3/ Ar
1Line, and finish transition process simultaneously.Prototype test has also confirmed this method of checking in laboratory, the result that we expected has wherein also appearred: the rail material of handling according to the inventive method, after finishing cooling procedure, degree with ten power under about room temperature condition is more straight than untreated rail material, and stress is littler.
Fig. 5 has represented the simple and easy diagrammatic sketch according to embodiment of the present invention.Wherein the foot of rail material (12) is placed on the support (21), and rail head (10) is being hung down.Measure with sensing head (30,31,32) such as among the figure layout, the heat radiation that sensing head (30) is used to measure foot (12), the heat radiation that sensing head (31) is used to measure rail amine (11), and the heat radiation that sensing head (32) is used to measure rail head (10).By data sensor device (33,34,35) the data notification that records to computer (40), and data and the quality that from the section bar position (10,11,12) measure is input to the computer with additional input one data sensor device (36).Relevant volume the computer of program calculate the product of its temperature and quality for each section bar position (10,11,12).And according to the ratio of this product, by signal sensor (37) control cooling medium feeding device (45,46,47).These feeding devices will work, and to determine the cooling medium ray (48) of direction, spray cooling medium facing to the rail head (10) that is hanging.Chain-dotted line among the figure (50) expression is cooling bed.It has the controllable cooling medium feeding device (45,46,47) that can be used for different cooling mediums (48).Cooling medium can comprise water, air, water/air blending agent etc.
By the measure of determining the cooling procedure of rail material and the present invention are compared.Be that rail material main body, rail head (10), rail amine (11) and foot (12) approximately are to reach transformation line Ar simultaneously
3/ Ar
1And the length variations on the thing followed differential profiles position also takes place simultaneously.Will hinder like this, compression and extension take place in a part of rail material position.Pass through the cooling effect in cooling bed (50), though can be formed on the temperature difference on the transverse section of section material once more, consequent stress is significantly below yield limit (point).Can cause such result with existing in the distortion that in Hookean region, takes place.Almost be not produce stress promptly through the later rail material of cooling processing, and almost with the same not straight through the hot rolling rail material of the inventive method processing.According to method of the present invention, give precalculated heat by removing, just can reach The above results.So that make each main position of rail material reach Fig. 1 time-transformation line Ar on the temperature ZTU chart
3/ Ar
1The time time of being disappeared be identical at least.This can be by obviously finding out the ratio of Fig. 3 and Fig. 4.
Claims (10)
1. the cooling means of hot rolling system section bar, wherein remove its rolling heat, this section bar is by position (10 of the Fig. 5 that has spacing to arrange at its cross section, 11,12), and rail material with different quality (1-5 of Fig. 2) constitutes, it is characterized in that at first using measuring device (30 of Fig. 5,31,32) with computer (40), calculate (10 of Fig. 5 on the different section bar positions by means of calculation procedure, 11,12) need the heat got rid of separately according to the ratio of its quality (1-5 of Fig. 2) and temperature, and calculate the supply of needed cooling medium (48) thus, then, according to the aforementioned calculation result to different section bar positions (10,11,12) or its quality (1-5) implement the cooling processing of control, so that make them separately with the least possible time difference, in the decay process of ferrite and/or pearlitic gamma (γ)-mixed crystal, discharge energy heating amount, reach transformation line Ar
3/ Ar
1
2. according to the method for claim 1, it is characterized in that proceeding cooling, make temperature be reduced to predetermined final temperature, and make each different mass cg (1-5 of Fig. 2) of section bar reach this final temperature with the least possible time difference by transition temperature.
3. according to the method for claim 1 or 2, it is characterized in that when calculating the heat that each position of section bar (10,11,12) discharged, should taking the transition temperature of sign steel product quality into account.
4. according to one or more the method among the claim 1-3, it is characterized in that the time rolling section bar or its each position (10,11,12) water enforcement cooling, calculate the heat exchange value on the differential profiles cross-sections surfaces, and give the supply that is identified for cooling off the needed cooling medium of each differential profiles cross-sections surfaces (48) thus.
5. according to one or more the method among the claim 1-4, it is characterized in that the rail material that its rail head (10) hangs down is transported to cooling bed (50) top.Use free convection wind the different separately mass cg (1-5 of Fig. 2) of rail material to be had the cooling of control then at least in part, follow the required separately heat that discharges of ratio, further cool off with additional cooling medium (48) according to the quality and the temperature of each position of rail material (10,11,12).
6. according to one or more the method among the claim 1-5, it is characterized in that directionally and intermittently spraying cooling medium (48), to exclude heat wherein to section bar position (10,11,12) separately.
7. according to one or more the method among the claim 1-6, it is characterized in that to carry out different reinforcement coolings to rolling section bar, so that can compensate the accidental temperature wedge that exists on profile length from the angle of mill length.
8. according to one or more the method among the claim 1-7, it is characterized in that whole rolling section bar or its each position (10,11,12) once or by giving are immersed in the cooling medium, to exclude heat wherein fixed cycle time over and over again.
9. implement device according to one or more method in the aforementioned all authority requirement, it is characterized in that in the curved side of rail material, preferably arrange the different parts that is used to measure this section bar with interval along stocking length, as rail head (10), the thermal-radiating measurement mechanism (30 of rail amine (11) or foot (12), 31,32), these devices are by data sensor device (33,34,35) with a computer (40) associated, then with input one data conduction device (36), data that measure on each position of relevant section bar and quality are input in the computer, and compiled program, calculating the product of temperature and quality, and according to the ratio standard of these products feeding device (45 by signal sensor (37) control cooling medium, 46,47).
10. according to the device of claim 9, it is controllable to it is characterized in that cooling bed (50) have, and is used to provide different cooling mediums (48), as the cooling medium feeding device (45,46,47) of water, air, water/air blending agent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP19503747.2 | 1995-02-04 | ||
| DE19503747A DE19503747A1 (en) | 1995-02-04 | 1995-02-04 | Method and device for cooling hot-rolled profiles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1139595A true CN1139595A (en) | 1997-01-08 |
| CN1076757C CN1076757C (en) | 2001-12-26 |
Family
ID=7753229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96104086A Expired - Fee Related CN1076757C (en) | 1995-02-04 | 1996-02-02 | Method and device for cooling hot-rolled shaped material |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0725152B1 (en) |
| JP (1) | JP4020445B2 (en) |
| KR (1) | KR960031630A (en) |
| CN (1) | CN1076757C (en) |
| AT (1) | ATE190360T1 (en) |
| DE (2) | DE19503747A1 (en) |
| ES (1) | ES2144161T3 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083013C (en) * | 1996-09-29 | 2002-04-17 | 攀枝花钢铁(集团)公司 | Heat treatment method and device for producing high-strength steel rail by using rolling waste heat |
| CN104561496A (en) * | 2014-12-25 | 2015-04-29 | 内蒙古科技大学 | Spray cooling experiment device for thermal treatment of steel rail |
| CN109136514A (en) * | 2018-10-31 | 2019-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Rail conveying device after heat treatment |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0807692A1 (en) * | 1996-05-15 | 1997-11-19 | Sms Schloemann-Siemag Aktiengesellschaft | Method of cooling structural steel beams |
| DE19962891A1 (en) * | 1999-12-23 | 2001-06-28 | Sms Demag Ag | Method and device for cooling hot-rolled profiles |
| DE10137596A1 (en) * | 2001-08-01 | 2003-02-13 | Sms Demag Ag | Cooling workpieces, especially profile rolled products, made from rail steel comprises guiding the workpieces through a cooling path composed of cooling modules with independently adjustable cooling parameters |
| JP2007302946A (en) * | 2006-05-11 | 2007-11-22 | Daido Steel Co Ltd | Method for manufacturing alloy steel |
| RU2456352C1 (en) * | 2010-11-11 | 2012-07-20 | Общество С Ограниченной Ответственностью Научно-Производственное Предприятие "Томская Электронная Компания" | Procedure and device for thermal treatment of rails |
| CN104307880A (en) * | 2014-11-10 | 2015-01-28 | 江苏亨特宏业重工有限公司 | Energy-saving cooling mechanism for hot rolling mill |
| CN105349769B (en) * | 2015-12-08 | 2017-11-14 | 中国铁道科学研究院金属及化学研究所 | A kind of rail flash weld seam automatic checkout equipment |
| CN107335770B (en) * | 2017-02-20 | 2019-05-10 | 湖北武铁山桥轨道装备有限公司 | Heat-treatment of rail system and heat treatment process |
| CA3130062C (en) * | 2019-03-15 | 2023-09-26 | Nippon Steel Corporation | Railway rail |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE404127C (en) * | 1924-02-16 | 1924-10-13 | Cie Des Forges De Chatillon Co | Process for straightening metal bars of asymmetrical cross-section, in particular on railroad tracks |
| DE1220876B (en) * | 1962-04-26 | 1966-07-14 | Kloeckner Werke Ag | Process for cooling rolled profiles, especially rails |
| DE1433715A1 (en) * | 1964-01-17 | 1968-12-12 | Breitenbach Gmbh Ed | Process for the heat treatment of heavy workpieces made of forged or cast steel |
| FR2109121A5 (en) * | 1970-10-02 | 1972-05-26 | Wendel Sidelor | |
| US4486248A (en) * | 1982-08-05 | 1984-12-04 | The Algoma Steel Corporation Limited | Method for the production of improved railway rails by accelerated cooling in line with the production rolling mill |
| EP0151194A1 (en) * | 1984-01-28 | 1985-08-14 | VEB Stahl- und Walzwerk "Wilhelm Florin" Hennigsdorf | Method of improving the evenness of rolled steel |
| DE4237991A1 (en) * | 1992-11-11 | 1994-05-19 | Schloemann Siemag Ag | Cooling hot-rolled products, rails - using appts. with carrier elements allowing rails to be suspended with their top downwards |
-
1995
- 1995-02-04 DE DE19503747A patent/DE19503747A1/en not_active Withdrawn
-
1996
- 1996-01-20 AT AT96100807T patent/ATE190360T1/en active
- 1996-01-20 ES ES96100807T patent/ES2144161T3/en not_active Expired - Lifetime
- 1996-01-20 EP EP96100807A patent/EP0725152B1/en not_active Expired - Lifetime
- 1996-01-20 DE DE59604567T patent/DE59604567D1/en not_active Expired - Lifetime
- 1996-01-24 KR KR1019960001475A patent/KR960031630A/en not_active Application Discontinuation
- 1996-02-01 JP JP01673496A patent/JP4020445B2/en not_active Expired - Fee Related
- 1996-02-02 CN CN96104086A patent/CN1076757C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083013C (en) * | 1996-09-29 | 2002-04-17 | 攀枝花钢铁(集团)公司 | Heat treatment method and device for producing high-strength steel rail by using rolling waste heat |
| CN104561496A (en) * | 2014-12-25 | 2015-04-29 | 内蒙古科技大学 | Spray cooling experiment device for thermal treatment of steel rail |
| CN109136514A (en) * | 2018-10-31 | 2019-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Rail conveying device after heat treatment |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59604567D1 (en) | 2000-04-13 |
| ES2144161T3 (en) | 2000-06-01 |
| JP4020445B2 (en) | 2007-12-12 |
| ATE190360T1 (en) | 2000-03-15 |
| JPH08239719A (en) | 1996-09-17 |
| EP0725152B1 (en) | 2000-03-08 |
| CN1076757C (en) | 2001-12-26 |
| KR960031630A (en) | 1996-09-17 |
| EP0725152A1 (en) | 1996-08-07 |
| DE19503747A1 (en) | 1996-08-08 |
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