CN104419866A - Cold-rolled steel plate for continuous brazing type double-layer roll-welded pipe and manufacturing method of cold-rolled steel plate - Google Patents
Cold-rolled steel plate for continuous brazing type double-layer roll-welded pipe and manufacturing method of cold-rolled steel plate Download PDFInfo
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- CN104419866A CN104419866A CN201310387753.8A CN201310387753A CN104419866A CN 104419866 A CN104419866 A CN 104419866A CN 201310387753 A CN201310387753 A CN 201310387753A CN 104419866 A CN104419866 A CN 104419866A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Abstract
The invention relates to a cold-rolled steel plate for a continuous brazing type double-layer roll-welded pipe and a production method of the cold-rolled steel plate, which are mainly used for solving the technical problems of poor molding property, stratification and false welding when the existing cold-rolled steel plate produced in a continuous annealing way is used for the continuous brazing type double-layer roll-welded pipe. The production method comprises the following steps: smelting according to components, then carrying out molten iron desulphurization, top and bottom combined blowing by a converter, refining by an RH furnace and protective casting by blowing Ar into low-carbon steel protective slag sequentially to obtain a slab, heating the slab by a heating furnace, performing descaling, rough rolling, finish rolling and coiling to obtain a hot-rolled steel coil, then re-uncoiling, pickling, performing cold rolling, annealing by a vertical continuous annealing furnace, leveling and coiling to obtain a finished product, wherein the finish rolling temperature is 840 DEG C-900 DEG C, the coiling temperature is 660 DEG C-700 DEG C, the cold-rolling reduction ratio is 80%-90%, the temperature range of strip steel in a full-hard state after cold-rolling in a soaking section of the vertical continuous annealing furnace is 740 DEG C-770 DEG C, the heat preservation time of the strip steel in the vertical continuous annealing furnace is 60s-120s, and the leveling elongation ratio is 0.8%-2.0%. The product provided by the invention is mainly used for the continuous brazing type double-layer roll-welded pipe.
Description
Technical field
The present invention relates to a kind of double coiled welded tube cold-rolled steel sheet and production method thereof, particularly a kind of continuous braze welding type double coiled welded tube cold-rolled steel sheet and production method thereof, belong to technical field of iron-base alloy.
Background technology
Double coiled welded tube be with two sides copper-plated precision steel strip around a center plug after 720 ° of cans, take copper plating film as the high temperature seam that solder carries out two-layer steel pipe, finally by cooling, it is superior that the techniques such as passivation become anti-fatigue performance, the double-layer pipe that leak resistance is good, be widely used in automobile pipe field, its production process is divided into 2 kinds according to the difference of the shaping rear soldering form of steel plate 720 ° of rollings: one is first shaping, rear scale, last many root beads pipe shakeouts together and enters large-scale soldering oven and complete double-layer tube wall seam, surface treatment is carried out one by one again after coming out of the stove, the discontinuous soldering type of scale packaging, another kind is that band coil of strip rolls into without scale after type, and double drum direct belt tension on tinuous production enters high temperature brazing district and carries out soldering, postwelding carries out cooling immediately, passivation, tortuous, the continuous braze welding type packed.The double-deck welded tube of continuous braze welding type produces line, large owing to avoiding traditional discontinuous soldering type investment of production equipment, takes up an area wide, complex manufacturing, and yielding poorly, it is not enough to wait, domestic so that in the world most of double-deck welded tube product line be continuous braze welding type.
As can be seen from above-mentioned production process, the continuity that continuous braze welding is produced due to it is for ensureing that whole piece produces the smooth and easy of line and carries out, higher to the stability of the strength of materials, size, plate shape etc., accuracy requirement more discontinuous soldering type.Secondly, in continuous braze welding is produced, outer year tension force is an indispensable condition, it is realize quantity-produced prerequisite on the one hand, also affect the stressing conditions of reel when rolling is shaping on the other hand: in continuous braze welding is produced, support when rising, the center plug of styling is when producing backward pulling force with mandrel interior wall, reel outer wall then will be subject to the outer forward direction tension force carrying tension force applying, is therefore easy to inside and outside tube wall demixing phenomenon occurs.In actual production, forward direction tension force is carried out to the adjustment of certain limit by the reasonable set carrying power outward, and backward tension force is due to mainly plug and inwall, frictional force between inwall and outer wall, therefore, need by the surface quality of reasonable set band steel and condition of surface to ensure effective control of backward tension force.In addition, appropriate surface appearance also effectively can reduce the unnecessary wearing and tearing of plug, reduces plug outwards " support is not enough ", the rosin joint phenomenon that interlayer " is rolled up not tight " and occurred.Finally, due to continuous seepage must be completed under certain tractive force, the double drum entering brazing area will bear the production of high temperature hightension, therefore, compare discrete soldering to produce, skelp also will possess certain high temperature hot deformation resistance, prevents material from the problem be pulled off due to thermoplasticity difference or body is out of shape occurring under the high temperature of nearly 1200 DEG C.
At present, produce on line at the double-deck welded tube of traditional discontinuous soldering type, connect the material returned with its excellent formability, template and surface quality have started to replace the cover material returned, but due in its brazing process, many root beads pipe is that tiling enters soldering oven and do not stress, therefore, moving back steel band selected by it generally all adopts low-carbon (LC) design to meet forming requirements, particular requirement is not done for high temperature resistance, as China Patent Publication No. CN102925794A, name is called, a kind of continuous annealing mode that uses produces technical scheme disclosed in automobile oil pipe double coiled welded tube cold-rolled steel sheet and manufacture method thereof.In prior art, enterprise is had once to attempt using this kind of material to carry out the production of the double-deck welded tube of continuous braze welding, but owing to often there are the quality problems such as disconnected pipe, layering, rosin joint, have to continue to use the cover material returned, namely selecting carbon aluminium-killed steel bell type annealing furnace to produce: the high temperature stability ensureing on the one hand steel band by improving C content, reducing the C of steel intermediate gap solid solution by long bell-type annealing on the other hand, N content reduces the strength of materials, ensures that the formability of material is to adapt to the shaping needs of rolling.But well-known, the problems such as intrinsic performance inequality of the cover material returned, plate shape, surface quality are not good also will be unavoidably.
In prior art, the cold-rolled steel sheet that continuous annealing mode is produced is used for the defect that continuous braze welding type double coiled welded tube cold-rolled steel sheet exists insufficient formability, when the cold-rolled steel sheet processing that bell-type annealing is produced is used for continuous braze welding type double coiled welded tube, there is the defect of performance inequality, surface quality difference.
Summary of the invention
The object of this invention is to provide a kind of continuous braze welding type double coiled welded tube cold-rolled steel sheet and production method thereof, solving the cold-rolled steel sheet of existing continuous annealing mode production for there is the technical problem of insufficient formability, layering, rosin joint during continuous braze welding type double coiled welded tube.
The technical solution used in the present invention is:
A kind of continuous braze welding type double coiled welded tube cold-rolled steel sheet, its chemical component weight per-cent is: C:0.04% ~ 0.065%, Si≤0.034%, Mn:0.25% ~ 0.35%, P≤0.025%, S≤0.020%, B:0.0015% ~ 0.0025%, Al:0.025% ~ 0.05%, N≤0.0035%, surplus is Fe and inevitable impurity element.
The reason that the chemical composition of continuous braze welding type double coiled welded tube cold-rolled steel sheet of the present invention is limited in above-mentioned scope is as follows:
Carbon: first, from materialogy rudimentary knowledge, how many meetings of C content directly affect Ar3 transition temperature, and namely austenitic transformation is ferritic transformation temperature.When copper plated steel band carries out soldering, for ensureing the abundant seam of double-layer tube wall, brazing temperature is generally between 1100 ~ 1200 DEG C, in this temperature range, compare China Patent Publication No. CN102925794A, name is called, a kind of carbon content using continuous annealing mode to produce 0.015 ~ 0.054% disclosed in automobile oil pipe double coiled welded tube cold-rolled steel sheet and manufacture method thereof, C content scope 0.04% ~ 0.065% in the present invention, the raising of C content lower limit makes Ar3 temperature obviously reduce, namely under same brazing temperature, austenitic transformation is that ferritic ratio reduces, the high temperature resistance of material improves, thermoplasticity improves, the risk of disconnected pipe reduces, contrary, if C content is lower than 0.04%, steel band high temperature resistance declines, and cannot meet the production requirement of high temperature hightension in continuous braze welding production.Secondly, according to production practice, the suitable raising of C content also helps the reduction of band steel yield tensile ratio, and then be conducive to the production of the double-deck welded tube of continuous braze welding: for the double-deck welded tube of discontinuous soldering, due to steel band when soldering not by external force, therefore, only need possess suitable yield strength to meet the requirement that normal temperature last volume rolls into type, generally requirement is not done to yield tensile ratio; But for the double-deck welded tube of continuous braze welding, for ensureing that disconnected pipe does not occur when soldering, except requiring that band steel possesses when rolling is shaping except suitable yield strength, also require certain tensile strength, namely certain yield tensile ratio.Only possess suitable yield tensile ratio, the production requirement of continuous braze welding rolling, welding could be met better.But meanwhile, C content can not be too high, otherwise the intensity of material is too high, is also unfavorable for shaping, and too much C atom solid solution cannot will cause the ageing deterioration of material.Given this, after the productive prospecting fully taking into account the double-deck welded tube of continuous braze welding type, the C content of the present invention's setting is 0.04% ~ 0.065%.
Silicon: in soft steel, Si is inevitable impurity element, the plasticity of Si content grievous injury cold-rolled steel sheet and forming property.But too low to Si content requirement, the cost of steel-making refining procedure can be improved.The present invention limits Si content≤0.034%.
Manganese: the effect of manganese in steel mainly crystal grain thinning, improves intensity, forms the harmful effect of MnS elimination due to S inevitable in steel simultaneously.In addition, the Mn/S ratio more than 40 also can increase the motivating force that MnS is formed in matrix, and then is reduced in the volume fraction of crystal boundary precipitation, reduces its embrittling effect, improves material at high temperature thermoplasticity.It is 0.25% ~ 0.35% that the present invention limits Mn content range.
P and s: phosphorus, sulphur are all the harmful elements in steel, in cold-rolled low carbon steel, all wish that these two kinds of control of elements are in lower level, fall the recrystallization temperature that P can reduce steel band, falling S can increase solid solution carbon amounts, reduce grain growth resistance, improve the punching performance of product.But consider actual process controllability, the present invention limits S≤0.020%, P≤0.025%.
Aluminium: aluminium can form aluminium nitride with the atom N of a fixing part with free N in steel, is conducive to the aging resistance improving steel plate.But when Al amount is too high, can cost of alloy be increased, also can form too much deoxidation products Al2O3 in addition and be mingled with.It is 0.025% ~ 0.05% that the present invention limits Al content.
Boron: boron effect in the present invention have following some: first, when welded tube leave high temperature brazing district begin to cool down time, B element can quick segregation to austenite grain boundary, suppress grain boundaries ferrite forming core, separate out boride alloy at brilliant Inner simultaneously, promote the ferritic forming core of brilliant Inner, thus avoid aligning stress concentration at crystal boundary, improve the high temperature thermoplasticity of steel.Secondly, B element with free N element forming section compound in steel with the N in solid solution steel, can also reduce free N content, improves the aging resistance of material.3rd, the interpolation of suitable B content, also can effective alligatoring ferrite crystal grain, and then completes recrystallize with relatively low annealing temperature.But B content can not be too high, otherwise the precipitated phase that there will be a kind of net distribution that steel is become fragile on austenite grain boundary is separated out, and causes high temperature " boron is crisp ", is unfavorable for high temperature thermoplasticity.To sum up, this restriction B content is: 0.0015 ~ 0.0025%.
Nitrogen: the N element be solid-solution in steel affects the ageing major reason of steel pipe, formability is affected on the one hand because timeliness can make steel plate produce front intensity rising from dispatching from the factory to, also the re-workability of double-deck welded tube postwelding can be reduced on the other hand, therefore, N content in steel should be reduced as possible, but consider actual production technology controlling and process ability, the present invention limits N≤0.0035%.
A kind of production method of continuous braze welding type double coiled welded tube cold-rolled steel sheet, smelt by following Ingredient percent: C:0.04% ~ 0.065%, Si≤0.034%, Mn:0.25% ~ 0.35%, P≤0.025%, S≤0.020%, B:0.0015% ~ 0.0025%, Al:0.025% ~ 0.05%, N≤0.0035%, surplus is Fe and inevitable impurity element; Adopt desulfurizing iron, converter top bottom blowing successively, the refining of RH stove, low-carbon steel protecting slag blow Ar protective casting obtain slab, slab through process furnace heating, de-scaling, roughing, finish rolling, batch acquisition coils of hot-rolled steel; then uncoiling again, through pickling, the annealing of cold rolling, vertical continuous annealing furnace, smooth, batch and obtain finished product, it is characterized in that:
1, the setting of C, B content in steel
For the productive prospecting of the high temperature had in the double-deck Welded Pipe Production Process of continuous braze welding, hightension, compare discontinuous soldering, the raising of the lower limit of C content can make Ar3 transformation temperature obviously reduce, and the high temperature thermoplasticity of steel plate improves.But meanwhile, C content can not be too high, otherwise the intensity of material is too high, is also unfavorable for shaping, and too much C atom solid solution cannot will cause the ageing deterioration of material.Adding of boron mainly suppresses soldering high-temperature zone ferrite at grain boundaries forming core, improve steel plate high temperature thermoplasticity, but B content can not be too high, otherwise the precipitated phase that there will be a kind of net distribution making steel become fragile on austenite grain boundary is separated out, cause high temperature " boron is crisp ", be unfavorable for high temperature thermoplasticity.Therefore, C content range set of the present invention is 0.04% ~ 0.065%, B content range is 0.0015% ~ 0.0025%.
2, hot fine rolling end temp setting
Generally speaking, for avoiding the appearance of mixed crystal, hot rolling finish to gauge is all in austenitic area rolling, and namely finish rolling end temp temperature is higher than Ar3 transformation temperature, but too high finishing temperature also can cause austenite crystal and precipitate alligatoring, is unfavorable for product mechanical property.Therefore the present invention sets finish rolling end temp is 840 DEG C ~ 900 DEG C.
3, the setting of hot-rolling coiling temperature
Hot-rolling coiling temperature major effect materials microstructure, performance and cold rolling after company move back recrystallization temperature.For the double-deck welded tube of continuous braze welding type, relatively high coiling temperature one side can obviously reduce to connect moves back recrystallization temperature, also can make precipitate alligatoring on the other hand, be conducive to the yield strength reducing final material, improve the formability of double-deck welded tube.But coiling temperature also should not be too high, otherwise iron scale is serious, increases pickling difficulty, is unfavorable for the surface quality of cold-reduced sheet.Consider, it is 660 DEG C ~ 700 DEG C that the present invention sets hot-rolling coiling temperature.
4, cold rolling draft
Cold rolling draft improves, and can store more deformation energy in steel plate, increases recrystallize motivating force, reduces recrystallization temperature, but mill load increases obviously when draft is more than 90%, and process stability is poor.Consider the actual capacity of milling train, it is 80% ~ 90% that the present invention sets cold rolling draft.
5, annealing temperature setting
Recrystallization annealing mainly in order to eliminate produce in cold-rolled process work hardening, anisotropy etc. in all kinds of defect of crystals and mechanical property, and recrystallization temperature and the product performance demands of being with steel are mainly considered in the setting of annealing temperature, according to the rolling processability requirement of double-deck welded tube, it is 740 DEG C ~ 770 DEG C that the present invention sets steel plate in the annealing region that vertical continuous annealing furnace soaking zone exports, and soaking time is 60s ~ 120s.
6, smooth control
Cold rolling levelling technique processes under carrying out minute-pressure to the steel band through recrystallization annealing, and object has be the yield point elongation being eliminated carbon aluminium-killed steel by the setting of smooth rate at three: one, ensures the formability of material; Two is the templates improving the rear steel plate of annealing; Three are through the roughness that leveling roll gives required by surface of steel plate.For the upper and lower surperficial different roughness design in the present invention, first, because steel band two sides roughness requirements is different, leveling roll supporting with it must be used, through up to a hundred production tests, find that the top roll roll surface roughness Ra when leveling roll is 0.1 μm ~ 0.7 μm, when lower roll roll surface roughness Ra is the scope of 2.0 μm ~ 3.0 μm, coordinate certain strip tension, just can realize band steel upper and lower surface target roughness; Secondly, for preventing that stress suffered by the upper and lower roll surface roughness difference upper and lower plate face that may cause is different and steel band wooden dipper that is that cause is bent, skid, the relatively dry smooth leveling precision also by spraying different oilness in band steel upper and lower surface of wet jetting piles adjusts the rolling load of upper and lower leveling roll, reduces upper and lower plate face stress-difference; In addition, for the setting of smooth rate, the basis of satisfied elimination yield point elongation can not be arranged and excessively make intensity increase in case cause steel plate again to produce work hardening, be unfavorable for shaping.The present invention, through repeatedly groping, thinks that smooth elongation control both can realize performance requriements in the scope of 0.8% ~ 2.0%, has and can ensure good plate shape.
7, surface of cold-rolled steel plate roughness controls
For the double-deck welded tube of continuous braze welding type, surface of cold-rolled steel plate roughness mainly affects plug and inwall, frictional force between inwall and outer wall when center plug departs from reel: the stress in the forward and backward two kinds of directions existed between due to two-layer reel, this must produce torsional deformation between two-layer tube wall affects its laminating degree, and then affects interlayer seam.Meanwhile, inwall also can cause the reduction of plug dimensional precision to the wearing and tearing of plug, causes plug outwards " support is not enough ", the rosin joint phenomenon that interlayer " is rolled up not tight " and occurred.For solving the problem, the present invention proposes the upper and lower surperficial different roughness design of steel band: the projection termination roughness contacted with pipe crimping inwall due to center plug is less, therefore, when size roll external force that inside extrusion molding applies is constant, can reduce by reducing band steel upper surface roughness the backward pulling force that the frictional force between plug and inwall (being with steel upper surface) produces, welded tube is easily deviate from; By improving band steel lower surface roughness, the frictional force that can improve (the band upper and lower surface of steel) between inside and outside tube wall solves outer wall and bears the outer tube wall layering of carrying forward direction pulling force and causing.In addition, the high roughness design of lower surface (outer wall) also can significantly improve the surface adhesion force after the copper facing of band steel, be conducive to the attachment of postwelding copper film at tube wall, but simultaneously, lower surface roughness can not be excessive, otherwise by the luminance brightness after the copper facing of influence zone steel.The present invention is according to Welded tube production actual needs and steel band production control ability, and be 0.3 μm ~ 0.8 μm through repeatedly groping setting cold-rolled steel sheet upper surface roughness Ra, cold rolling lower surface roughness Ra is 0.9 μm ~ 1.9 μm.
The present invention has following positively effect compared to existing technology:
The present invention is by adopting reasonable component design, hot rolling, cold rolling, continuous annealing, the combination production control of the technique of smooth and cold-rolled steel sheet upper and lower surface different roughness goes out cold-rolled steel sheet, meet high temperature in the double-deck Welded tube production of continuous braze welding type, hightension and continuous seepage are to the performance requriements of cold-rolled steel sheet, significantly reduce the inner and outer pipes wall stress that continuous braze welding type double-deck welded tube wall occurs in cold-rolled steel strip tension force brazing process poor, solve the tube wall layering occurred in continuous seepage, the quality problems such as rosin joint, the lumber recovery of the double-deck welded tube of continuous braze welding type is significantly improved, reduce the double-deck Welded tube production cost of continuous braze welding type.
Accompanying drawing explanation
Accompanying drawing 1 is the cold-rolled steel sheet metallographic structure photo of the embodiment of the present invention 2.
Accompanying drawing 2 is the metallographic structure photo making double-deck welded tube (as automobile oil pipe) with the cold-rolled steel sheet of the embodiment of the present invention 2 through continuous braze welding.
Embodiment
Below in conjunction with embodiment 1 ~ 3, the present invention will be further described, as shown in table 1 ~ 5.
Table 1 chemical composition of the present invention (weight percent %), surplus is Fe and inevitable impurity.
By molten iron pre-desulfurization, converter top bottom blowing, obtains the molten steel of mentioned component after RH stove refining treatment, and adopt low-carbon steel protecting slag to blow Ar protective casting and become continuous casting steel billet, thickness 210mm, width is 800 ~ 1300mm, and length is 5000 ~ 10000mm.Scale slab is delivered to process furnace and is reheated, and delivers to rolling on Continuous Heat tandem rolling mill after dephosphorization of coming out of the stove.By obtaining the steel plate of 2.0mm ~ 3.0mm after roughing milling train and the controlled rolling of finish rolling Continuous mill train, then carry out batching output.Hot-rolled temperature technology controlling and process is in table 2.
Table 2 hot rolling technology controling parameters of the present invention
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, reversible rolling or 5 Stands Cold Tandem Mills carry out cold rolling, cold rolling draft is 80% ~ 90%, the steel band rolling hard state after cold rolling through vertical continuous annealing furnace annealing, smooth, batch the finished product cold-rolled steel strip obtaining thickness 0.25mm ~ 0.5mm.Annealing process is: steel plate is respectively 740 DEG C ~ 770 DEG C in the temperature range that the soaking zone of vertical continuous annealing furnace exports, and steel plate in the soaking time of soaking zone is: 60s ~ 120s.Smooth unit elongation after annealing is 0.8% ~ 2.0%, and process control parameter is in table 3.
Table 3 the present invention is cold rolling, annealing process and smooth rate controling parameters
Embodiments of the invention 1 adopt dry smooth, do not spray leveling precision; The model that embodiment 2,3 is produced by spray Shanghai Yushiro Chemical Industry Co., Ltd. is that PTA-10F leveling precision carries out wet jetting piles, and leveling roll controls the main technique of surface of cold-rolled steel plate roughness in table 4.
Table 4 leveling roll of the present invention controls the main technologic parameters of surface of cold-rolled steel plate roughness
The mechanical property of the double coiled welded tube cold rolled strip utilizing aforesaid method to obtain, in table 5, meets double-deck welded tube cold-rolled substrate yield strength 170 ~ 260MPa, and Kang La Qiang Du≤275MPa, Yan Shen Shuai≤performance requriements of 32%.
The mechanics of table 5 cold-rolled steel sheet product of the present invention and surface property
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (4)
1. a continuous braze welding type double coiled welded tube cold-rolled steel sheet, it is characterized in that described cold-rolled steel sheet chemical composition mass percent is: C:0.04% ~ 0.065%, Si≤0.034%, Mn:0.25% ~ 0.35%, P≤0.025%, S≤0.020%, B:0.0015% ~ 0.0025%, Al:0.025% ~ 0.05%, N≤0.0035%, surplus is Fe and inevitable impurity element.
2. a kind of continuous braze welding type double coiled welded tube cold-rolled steel sheet as claimed in claim 1, it is characterized in that, the upper surface roughness of described cold-rolled steel sheet is 0.3 μm
≤ra≤0.8 μm, lower surface roughness is 0.9 μm
≤ra≤1.9 μm.
3. the production method of a continuous braze welding type double coiled welded tube cold-rolled steel sheet, smelt by following Ingredient percent: C:0.04% ~ 0.065%, Si≤0.034%, Mn:0.25% ~ 0.35%, P≤0.025%, S≤0.020%, B:0.0015% ~ 0.0025%, Al:0.025% ~ 0.05%, N≤0.0035%, surplus is Fe and inevitable impurity element, adopt desulfurizing iron successively, converter top bottom blowing, the refining of RH stove, low-carbon steel protecting slag blows Ar protective casting and obtains slab, slab heats through process furnace, de-scaling, roughing, finish rolling, batch acquisition coils of hot-rolled steel, then uncoiling again, through pickling, cold rolling, vertical continuous annealing furnace is annealed, smooth, batch and obtain finished product, it is characterized in that: continuous casting steel billet Heating temperature is 1160 DEG C ~ 1200 DEG C, continuous or semicontinuous hot continuous rolling frame carries out rolling, finish rolling end temp is 840 DEG C ~ 900 DEG C, after finish rolling, coiling temperature is 660 DEG C ~ 700 DEG C, cold rolling draft is 80% ~ 90%, the hard state band steel that rolls after cold rolling is 740 DEG C ~ 770 DEG C in the annealing temperature of vertical continuous annealing furnace soaking zone, be 60s ~ 120s in soaking zone soaking time, the smooth unit elongation of cold-rolled steel sheet is 0.8% ~ 2.0%.
4. the production method of a kind of continuous braze welding type double coiled welded tube cold-rolled steel sheet as claimed in claim 3, it is characterized in that, top roll roll surface roughness Ra for the smooth leveling roll of described cold-rolled steel sheet is 0.1 μm ~ 0.7 μm, and lower roll roll surface roughness Ra is 2.0 μm ~ 3.0 μm.
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| CN112371750A (en) * | 2020-11-13 | 2021-02-19 | 江苏沙钢集团有限公司 | Control method for width precision of low-carbon steel annealed plate |
| CN112442577A (en) * | 2019-09-05 | 2021-03-05 | 上海梅山钢铁股份有限公司 | Cold-rolled steel plate with excellent aging resistance for double-layer coil-welded pipe and manufacturing method thereof |
| CN112795731A (en) * | 2019-11-13 | 2021-05-14 | 上海梅山钢铁股份有限公司 | Cold-rolled steel plate for lampshade and production method thereof |
| CN112958930A (en) * | 2021-02-06 | 2021-06-15 | 邯郸钢铁集团有限责任公司 | Welding method for high-carbon equivalent strip steel in continuous annealing |
| CN114367534A (en) * | 2021-12-14 | 2022-04-19 | 新疆湘润新材料科技有限公司 | Production process of pure titanium cold-rolled bright-surface titanium belt |
| CN115505817A (en) * | 2021-06-07 | 2022-12-23 | 上海梅山钢铁股份有限公司 | Production method of low-thickness low-carbon B-containing hot rolled steel plate |
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| CN112442577A (en) * | 2019-09-05 | 2021-03-05 | 上海梅山钢铁股份有限公司 | Cold-rolled steel plate with excellent aging resistance for double-layer coil-welded pipe and manufacturing method thereof |
| CN112795731A (en) * | 2019-11-13 | 2021-05-14 | 上海梅山钢铁股份有限公司 | Cold-rolled steel plate for lampshade and production method thereof |
| CN112157135A (en) * | 2020-09-07 | 2021-01-01 | 山东钢铁集团日照有限公司 | Production method of economical cold-rolled steel plate for water heater water tank outer plate |
| CN112371750A (en) * | 2020-11-13 | 2021-02-19 | 江苏沙钢集团有限公司 | Control method for width precision of low-carbon steel annealed plate |
| CN112958930A (en) * | 2021-02-06 | 2021-06-15 | 邯郸钢铁集团有限责任公司 | Welding method for high-carbon equivalent strip steel in continuous annealing |
| CN115505817A (en) * | 2021-06-07 | 2022-12-23 | 上海梅山钢铁股份有限公司 | Production method of low-thickness low-carbon B-containing hot rolled steel plate |
| CN114367534A (en) * | 2021-12-14 | 2022-04-19 | 新疆湘润新材料科技有限公司 | Production process of pure titanium cold-rolled bright-surface titanium belt |
| CN114367534B (en) * | 2021-12-14 | 2024-03-29 | 新疆湘润新材料科技有限公司 | Production process of pure titanium cold-rolled bright-surface titanium belt |
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