CN102747283A - Method for producing steel strip for copper-plated precision welded pipe - Google Patents
Method for producing steel strip for copper-plated precision welded pipe Download PDFInfo
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Abstract
The invention discloses a method for producing a steel strip for a copper-plated precision welded pipe. The method comprises that molten iron is subjected to a KR desulfurization process, a converter dephophorization-slag-free decarbonization process and a RH deep decarbonization process, and slabs are obtained through continuous casting; slabs are heated, hot rolled plates are obtained through rough rolling and precision rolling, hot rolled plates are cooled and hot rolled coils are obtained through rolling; and after being subjected to cold rolling, annealing and leveling, hot rolled plates are rolled, and products are obtained. By the aid of the method, the copper-plated precision welded pipe steel strip which has high ductility, high shaping performance, good coating performance and good welding performance can be produced, and requirements of welding and drawing producing processes of copper-plated precision welded pipes and usage requirements of cold bending formation and pressure-bearing are met.
Description
Technical field
The present invention relates to technical field of steel rolling, the working method of the effective steel band of particularly a kind of copper facing precision welding.
Background technology
The accurate welded tube of copper facing is to roll into type with the copper plated steel roll coil of strip, high precision, minor diameter thin wall bilayer or the individual layer welded tube produced through soldering or hight frequency welding, and the outside dimension scope of this copper facing welded tube is generally 2.75～12mm, and wall thickness is 0.5～0.9mm.The accurate welded tube of copper facing is mainly used in oil-pressure gauge(feed)pipe, oil fuel pipe, the brake line in automotive industry, refrigeration industry, the well heater process industry and similarly installs; Can also be widely used in alternative copper pipe; Reduce use cost, the development of Chinese Automobile Industry ' and refrigeration industry has promoted the fast development of the accurate welded tube industry of copper facing.
Therefore effective liquid or the gas carried of copper facing precision welding require weld seam not allow leakage, and requirement can be born certain pressure again, and general work pressure is 0.4～0.6MPa, and collapsing pressure is greater than 1.1MPa.Copper plate mainly is the scolder of asking as two-layer steel band, also has the effect that prevents that steel pipe is corroded in refrigeration agent, gasoline or diesel oil simultaneously.For double-deck copper facing precision welding pipe, steel band after copper facing, is cut into corresponding width according to caliber, after becoming pipe on the rolling machine, directly get into brazier, under the melting temperature (1083 ℃) of copper, weld.And, steel band after copper facing, is cut into corresponding width according to caliber for the accurate welded tube of individual layer copper facing, after becoming pipe on the rolling machine, adopt hight frequency welding to weld, and then become production tube through cold drawing.
The band steel will pass through shaping machine set and produce bigger plastic bending after copper facing; Make it to become double coiled welded tube or individual layer ratio-frequency welded tube; This not only requires combining between coating and parent to want firmly; And requiring coating itself that good plasticity will be arranged, the piping system in automotive industry, refrigerating industry and the well heater process industry often need curve specific shape simultaneously, and will keep the inner cavity of pipe of curved part indeformable.In order to guarantee that copper facing precision welding pipe has good use properties and processing characteristics; Require that the effective steel band performance of copper facing precision welding is even, ductility good, copper facing excellent property, surface quality and dimensional precision be high, satisfies the welding of the accurate welded tube of copper facing and the request for utilization of drawing production technique and cold bending and pressure-bearing.
Summary of the invention
Technical problem to be solved by this invention provides a kind of ductility that can improve the effective steel band of copper facing precision welding and coating performance, to improve the effective steel band working method of copper facing precision welding of steel band copper facing performance and processability
For solving the problems of the technologies described above, the invention provides the working method of the effective steel band of a kind of copper facing precision welding, comprise the steps:
The step 1) molten iron is after KR desulfurization processing, converter dephosphorization-few slag decarbonization process, the dark carbonization treatment of RH, and continuous casting obtains slab;
Step 2) after the slab heating, roughing, finish rolling obtain hot-rolled sheet, coil into hot rolled coil after the hot-rolled sheet cooling;
The step 3) hot rolled coil coils into finished product through cold rolling, annealing, after smooth.
Further, said slab chemical component weight per-cent is C≤0.002wt%, Si≤0.01wt%, Mn:0.11-0.15wt%; P≤0.01wt%, S≤0.01wt%, Ti:0.05-0.08wt%, Alt≤0.02-0.04wt%; N≤30ppm, O≤30ppm, surplus is Fe and trace element.
Further, the described molten iron of step 1) is after KR desulfurization processing, converter dephosphorization-few slag decarbonization process, the dark carbonization treatment of RH, and continuous casting obtains slab, comprising:
Molten iron obtains the molten steel of Si≤0.01wt%, P≤0.008wt%, S≤0.01wt% through KR desulfurization processing, converter dephosphorization-few slag decarbonization process;
The molten steel of Si≤0.01wt%, P≤0.008wt%, S≤0.01wt% obtains the molten steel of C≤0.0015wt%, N≤25ppm through the dark carbonization treatment of RH, calm tapping;
The continuous casting of molten steel of C≤0.0015wt%, N≤25ppm obtains slab.
Further, the vacuum tightness of the dark carbonization treatment of said RH less than the time of 100Pa greater than 12 minutes; The said sedative time was greater than 30 minutes; Said continuous casting is the full guard casting, and the continuous casting nitrogen increased amount is below the 3ppm, and the slab nitrogen content guarantees superfluous Ti:0.03～0.04wt% below 30ppm.
Further, step 2) after the described slab heating, obtain hot-rolled sheet, comprising through roughing, finish rolling:
The slab heating, tapping temperature is 1220-1300 ℃, be 3.0-4.0 hour heat-up time;
Slab again through two roller roughing of 1 passage and the four roller roughing of 5 passages, obtains intermediate blank through Fixed width pressing machine Fixed width;
Intermediate blank obtains hot-rolled sheet through 7 passage finish rolling;
Batch rolling after the cooling of hot-rolled sheet laminar flow.
Further, the total draft of said roughing is greater than 83%, and the last frame percentage pass reduction of said 7 passage finish rolling is greater than 10%;
Launch stay-warm case between said roughing and the said finish rolling, and adopt lubrication and rolling;
The roughing temperature out of said hot-rolled sheet is that 1070-1100 ℃, finishing temperature are that 900-950 ℃, coiling temperature are 680-720 ℃;
The quick refrigerative mode of leading portion is adopted in said laminar flow cooling.
Further, the described hot rolled coil of step 3) coils into finished product through cold rolling, annealing, after smooth, comprising:
Pickling behind the hot rolled coil straightening scale breading is processed chill volume through tandem mills is cold rolling again;
After chill volume cleans decontamination, smooth through continuous annealing furnace annealing, levelling machine, batch again and be finished product.
Further, the cold rolling draft when said hot rolled coil is cold rolling is 80-86%, and the smooth elongation control of said levelling machine is at 0.8-1.0%.
Further, said chill each section temperature when twisting in the continuous annealing furnace annealing is as shown in the table:
| Heating zone/℃ | Soaking zone/℃ | The slow cooling outlet/℃ | Fast cold outlet/℃ | Overaging/℃ |
| 740±10 | 740±10 | 640±10 | 420±10 | 380±10 |
[0031]Further, the thickness specification of said finished product is 0.45-0.80mm; Its ys is that 170-230MPa, tensile strength are that 280-320MPa, elongation after fracture A50 are greater than 45.0%.
The working method of the effective steel band of a kind of copper facing precision welding provided by the invention; Can produce have high drawing property, good coating performance and the effective steel band of copper facing precision welding of good welds performance; Satisfy the production and the request for utilization of the accurate welded tube of copper facing, prevent produce and use in occur breaking, accidents such as bending crack, rack of fusion, seepage.
Embodiment
The working method of the effective steel band of a kind of copper facing precision welding that the embodiment of the invention provides comprises the steps:
1) with after molten iron process KR desulfurization processing, converter dephosphorization-few slag decarbonization process, the dark carbonization treatment of RH, carries out the slab that continuous casting obtains high cleanliness again;
2) said slab is heated after, obtain hot-rolled sheet through roughing, finish rolling again, coil into hot rolled coil after said hot-rolled sheet is cooled off;
3) said hot rolled coil is coiled into finished product through cold rolling, annealing, after smooth.
Wherein, the chemical component weight per-cent of the said slab of step 1) is C≤0.002wt%, Si≤0.01wt%, Mn:0.11-0.15wt%; P≤0.01wt%, S≤0.01wt%, Ti:0.05-0.08wt%, Alt:0.02-0.04wt%; N≤30ppm, O≤30ppm, surplus is Fe and trace element.
Wherein, after step 1) was passed through KR desulfurization processing, converter dephosphorization-few slag decarbonization process, the dark carbonization treatment of RH with molten iron, the slab that carries out continuous casting acquisition high cleanliness again comprised:
Molten iron is obtained the molten steel of Si≤0.01wt%, P≤0.008wt%, S≤0.01wt% through said KR desulfurization processing, said converter dephosphorization-few slag decarbonization process;
With the molten steel of Si≤0.01wt%, P≤0.008wt%, S≤0.01wt% through the dark carbonization treatment of RH, vacuum tightness less than time of 100Pa greater than 12 minutes, adopt calm tapping, the calm time obtained the molten steel of C≤0.0015wt%, N≤25ppm greater than 30 minutes;
The molten steel of C≤0.0015wt%, N≤25ppm is obtained the slab of high cleanliness through continuous casting process; Continuous casting process adopts the full guard casting; The continuous casting nitrogen increased amount is below the 3ppm, and the slab nitrogen content is controlled at below the 30ppm, guarantees superfluous Ti:0.03～0.04wt%.
Wherein, step 2) slab is heated after, obtain hot-rolled sheet through roughing, finish rolling again, coil into hot rolled coil after hot-rolled sheet is cooled off and comprise:
Slab is heated, and tapping temperature is 1220-1300 ℃, and be 3.0-4.0 hour heat-up time;
With slab through the Fixed width pressing machine obtain needed width of plate slab, again through two roller roughing of 1 passage and the four roller roughing of 5 passages, the roughing temperature out is 1070-1100 ℃, the total draft of roughing obtains intermediate blank greater than 83%;
Through 7 passage finish rolling, finishing temperature is 900-950 ℃ with intermediate blank, and last frame percentage pass reduction obtains hot-rolled sheet greater than 10%; Between roughing and finish rolling, launch stay-warm case, guarantee the homogeneity of intermediate blank temperature, adopt lubrication and rolling, improve rolling condition;
Hot-rolled sheet is coiled into hot rolled coil after the cooling of the quick refrigerative laminar flow of the leading portion type of cooling, coiling temperature is 680-720 ℃.
Wherein, step 3) coils into finished product with hot rolled coil through cold rolling, annealing, after smooth and comprises:
Hot rolled coil is removed its scale on surface through pickling tank earlier behind the straightening scale breading, get into 5 frame tandem mills again and carry out the cold rolling chill volume of processing, cold rolling draft is 80-86%;
Said chill volume cleaning and removing is removed behind its surface and oil contaminant earlier through the continuous annealing furnace annealing, passed through levelling machine again and carry out smoothly, batch then and be finished product, wherein, the smooth unit elongation of levelling machine is controlled at 0.8-1.0% according to chill volume thickness specifications vary; Chill volume is during through the continuous annealing furnace annealing, and the temperature of each section is as shown in the table in the continuous annealing furnace:
| Heating zone/℃ | Soaking zone/℃ | The slow cooling outlet/℃ | Fast cold outlet/℃ | Overaging/℃ |
| 740±10 | 740±10 | 640±10 | 420±10 | 380±10 |
Wherein, the thickness specification that obtains finished product at last is 0.45-0.80mm; Its ys is that 170-230MPa, tensile strength are that 280-320MPa, elongation after fracture A50 are greater than 45.0%.
The working method of the effective steel band of a kind of copper facing precision welding provided by the invention is with the chemical ingredients of steel to improve plasticity, toughness and the splitting resistance of steel band through control, avoids in tubulation and use, cracking.The present invention has adopted ultra low carbon IF steel (C is less than 0.003%) in the production process of steel band, handle the gap former (C, N) that makes in the sosoloid through Ti and be able to remove, and obtains purified ferrite matrix, eliminates the disadvantageous effect of interstitial atom; Simultaneously, through reducing the content of S, P, gas contents such as the O in the control steel band, N, the cold-forming property of raising steel band.Because inclusion is crisp and hard, when material deformed, inclusion can break away from matrix; Form the cavity in metal inside, cause material damage, therefore; Inclusion in the band steel is the major cause that reduces band steel mechanical property and use characteristics, and for this reason, steel band working method provided by the invention is through improving the purity of steel band; Distribution, form, size and the quantity of inclusion, particularly brittle inclusion in the steel band is controlled in strictness, improves the toughness and the plasticity of copper facing steel band.
Because the silicon in the steel influences the coating time; Silicon amasss the tack that reduces coating in the surperficial richness of steel when the reduction heating, thereby influences copper-plated performance, and too high on the other hand Si causes that also relative reduction in area significantly reduces; The relative reduction in area of steel and unit elongation reduce; Can cause the cold-forming property variation of steel, be unfavorable for the stable smooth operation of technologies such as steel pipe drawing technology and bending forming, therefore the working method of the effective steel band of a kind of copper facing precision welding provided by the invention has adopted low Si composition design.
Because Ti combined with N and S earlier before purifying C; Therefore for the production technique of improving the copper facing precision tube and the use properties that improves the copper facing precision tube; Should improve the plastic strain ratio (being the r value) of steel band; Must strictly control superfluous Ti:0.03～0.04wt%, its superfluous Ti is w (Ti)-(48/14) w (N)-(48/32) w (S)-(48/12) w (C).
The process thought that the working method of the effective steel band of a kind of copper facing precision welding provided by the invention adopts heat, high temperature rolling and high temperature to batch: heat guarantees that not only the thick dephosphorization temperature of steel billet is greater than Fe
2SiO
41170 ℃ of fusing points, be equipped with the multi-pass dephosphorize by high pressure water at rough rolling step, make the Fe of billet surface
2SiO
4Remove, guarantee the surface quality of band steel, also provide safeguard for the high temperature rolling in finish rolling stage.The scheme that adopts high temperature to batch simultaneously, guaranteeing to batch the back carboritride can be separated out and grown up fully, and carbide is assembled and thickization, and obtains thick ferritic structure.
Cold rolling draft can produce significant effects to the rolled structure of cold rolled strip and the recrystallization texture that in annealing, forms, and therefore the different cold rolling draft according to specification is controlled at 80-86%.Adopt rapid heating, postpone the solid solution and the answer of thick carbide, be formed with the recrystallized structure that is beneficial to the raising drawing property.
In order to obtain the higher unit elongation and the steel band of ys; The working method of the effective steel band of copper facing precision welding provided by the invention has adopted low temperature annealing process; Make steel band that sufficient recrystallize take place; Control the size of the crystal grain of steel band through the control soaking time, thereby improve the tensile strength of steel band; Through obtaining the cold-rolled steel strip of low yield strength ratio and high-elongation, the ductility of coming further to improve steel band.
Specify the working method of the effective steel band of a kind of copper facing precision welding provided by the invention below through embodiment.
Embodiment 1
After molten iron process KR desulfurization processing, converter dephosphorization-few slag decarbonization process, the dark carbonization treatment of RH, carry out continuous casting again and obtain slab.Its slab melting chemical composition weight ratio is C:0.0016wt%, Si:0.004wt%, Mn:0.13wt%, P:0.007wt%; S:0.006wt%, Ti:0.06wt%, Alt:0.031wt%; N:17ppm, O:21ppm, surplus is Fe and other trace elements basically.
Production stage and processing parameter; Earlier slab is heated, the slab tapping temperature is 1256 ℃, and be 3.1 hours heat-up time; The roughing temperature out is 1085 ℃, and finishing temperature is 928 ℃, and coiling temperature is 702 ℃; The specification of hot rolled coil is 2.996 * 1265mm; Its scale on surface is removed in pickling on sour milling train group then, gets into 5 frame cold continuous rollings and obtains chill volume, and draft is 83.5%.After chill volume gets into continuous annealing furnace annealing (each section of annealing process temperature is as shown in table 1), smooth processing (smooth unit elongation is 0.91%) at last; Obtaining specification at last is the effective steel band of copper facing precision welding of 0.495 * 1248mm, and its ys is that 202MPa, tensile strength are that 295MPa, elongation after fracture A50 are 51.5%.
Table 1, each section of the effective steel band annealing process of copper facing precision welding thermometer of 0.495 * 1255mm
| Heating zone/℃ | Soaking zone/℃ | The slow cooling outlet/℃ | Fast cold outlet/℃ | Overaging/℃ |
| 741 | 742 | 642 | 422 | 383 |
[0064]Embodiment 2
Be that with embodiment 1 difference its slab melting chemical composition weight ratio is C:0.0017wt%, Si:0.005wt%; Mn:0.12wt%, P:0.005wt%, S:0.006wt%; Ti:0.06wt%, Alt:0.028wt%, N:16ppm; O:20ppm, surplus is Fe and other trace elements basically.The hot rolled coil specification is 3.495 * 1260mm, and other production stage is consistent with embodiment 1 with processing parameter.The trimmed size that obtains is 0.591 * 1252mm, and its ys is that 194MPa, tensile strength are that 296MPa, elongation after fracture A50 are 48.5%.
Embodiment 3
Be that with embodiment 1 difference its slab melting chemical composition weight ratio is C:0.0015wt%, Si:0.005wt%; Mn:0.14wt%, P:0.006wt%, S:0.005wt%; Ti:0.06wt%, Alt:0.033wt%, N:22ppm; O:25ppm, surplus is Fe and other trace elements basically.The hot rolled coil specification is 4.497 * 1268mm, and other production stage is consistent with embodiment 1 with processing parameter.The trimmed size that obtains is 0.793 * 1251mm, and its ys is that 210MPa, tensile strength are that 306MPa, elongation after fracture A50 are 50.5%.
Embodiment 4
Be that with embodiment 1 difference earlier slab is heated, the slab tapping temperature is 1265 ℃, be 3.4 hours heat-up time, and finishing temperature is 935 ℃, and coiling temperature is 706 ℃.Other production stage is consistent with embodiment 1 with processing parameter.The product specification that obtains is 0.497 * 1250mm, and its ys is that 195MPa, tensile strength are that 302MPa, elongation after fracture A50 are 49.5%.
Embodiment 5
Be that with embodiment 1 difference its each section of annealing process temperature is as shown in table 2, the hot rolled coil specification is 2.998 * 1263mm, and other production stage is consistent with embodiment 1 with processing parameter.The gained trimmed size is 0.501 * 1254mm, and its ys is that 208MPa, tensile strength are that 296MPa, elongation after fracture A50 are 52.5%.
Table 2, each section of the effective steel band annealing process of copper facing precision welding thermometer of 0.501 * 1254mm
| Heating zone/℃ | Soaking zone/℃ | The slow cooling outlet/℃ | Fast cold outlet/℃ | Overaging/℃ |
| 745 | 742 | 642 | 422 | 376 |
Embodiment 6
Be that with embodiment 1 difference hot rolled coil gets into 5 frame cold continuous rollings and obtains chill volume, draft is 82.6%.The hot rolled coil specification is 3.995 * 1231mm, and other production stage is consistent with embodiment 1 with processing parameter, and the gained trimmed size is 0.694 * 1204mm, and its ys is that 196MPa, tensile strength are that 295MPa, elongation after fracture A50 are 46.5%.
Embodiment 7
Be that with embodiment 1 difference smooth unit elongation is 0.92% during the smooth processing of levelling machine is chill volume.The hot rolled coil specification is 3.498 * 1485mm, and other production stage is consistent with embodiment 1 with processing parameter, and the gained trimmed size is 0.595 * 1465mm, and its ys is that 223MPa, tensile strength are that 314MPa, elongation after fracture A50 are 47.5%.
Embodiment 8
After molten iron process KR desulfurization processing, converter dephosphorization-few slag decarbonization process, the dark carbonization treatment of RH, carry out continuous casting again and obtain slab.Its slab melting chemical composition weight ratio is C:0.002wt%, Si:0.007wt%, and Mn:0.14wt%, P:0.005wt%, S:0.009wt%, Ti:0.07wt%, Alt:0.032wt%, N:28ppm, O:24ppm, surplus is Fe and other trace elements basically.
Production stage and processing parameter; Earlier slab is heated, the slab tapping temperature is 1255 ℃, and be 3.3 hours heat-up time, and finishing temperature is 932 ℃, and coiling temperature is 698 ℃.The thickness of hot rolled coil is 3.995 * 1558mm, and its scale on surface is removed in pickling on sour milling train group then, gets into 5 frame cold continuous rollings and obtains chill volume, and draft is 83.9%.After getting into continuous annealing furnace annealing (each section of annealing process temperature is as shown in table 3), smooth processing (smooth unit elongation is 0.92%) at last, obtaining specification at last is the effective steel band of copper facing precision welding of 0.645 * 1528mm.Its ys is that 187MPa, tensile strength are that 2970MPa, elongation after fracture A50 are 47.5%.
Table 3, each section of the effective steel band annealing process of copper facing precision welding thermometer of 0.645 * 1528mm
| Heating zone/℃ | Soaking zone/℃ | The slow cooling outlet/℃ | Fast cold outlet/℃ | Overaging/℃ |
[0083]?
| 743 | 741 | 639 | 418 | 378 |
The working method of the effective steel band of a kind of copper facing precision welding provided by the invention is in the composition design; Adopted the composition design philosophy of low N, low O; Improve the purity of steel band; Distribution, form, size and the quantity of inclusion, particularly brittle inclusion in the strict control steel band, the toughness and the plasticity of raising copper facing steel pipe; Adopt the composition design of low Si, improved the copper-plated performance of steel band; Adopt the composition design of Ultra-low carbon and an amount of Ti, improved the r value of steel band, improved the forming property of steel band.In technological design, adopt heat, high temperature rolling, high temperature to batch and stress relief annealed process thought, obtained the cold-rolled steel strip of low yield strength ratio and high-elongation.
It should be noted last that; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to instance the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. the working method of the effective steel band of copper facing precision welding is characterized in that, comprises the steps:
The step 1) molten iron is after KR desulfurization processing, converter dephosphorization-few slag decarbonization process, the dark carbonization treatment of RH, and continuous casting obtains slab;
Step 2) after the slab heating, obtains hot-rolled sheet, coil into hot rolled coil after the hot-rolled sheet cooling through roughing, finish rolling;
The step 3) hot rolled coil coils into finished product through cold rolling, annealing, after smooth.
2. the working method of the effective steel band of copper facing precision welding according to claim 1 is characterized in that:
Said slab chemical component weight per-cent is C≤0.002wt%, Si≤0.01wt%, Mn:0.11-0.15wt%, P≤0.01wt%; S≤0.01wt%, Ti:0.05-0.08wt%, Alt≤0.02-0.04wt%; N≤30ppm, O≤30ppm, surplus is Fe and trace element.
3. the working method of the effective steel band of copper facing precision welding according to claim 1 is characterized in that, the described molten iron of step 1) is after KR desulfurization processing, converter dephosphorization-few slag decarbonization process, the dark carbonization treatment of RH, and continuous casting obtains slab, comprising:
Molten iron obtains the molten steel of Si≤0.01wt%, P≤0.008wt%, S≤0.01wt% through KR desulfurization processing, converter dephosphorization-few slag decarbonization process;
The molten steel of Si≤0.01wt%, P≤0.008wt%, S≤0.01wt% obtains the molten steel of C≤0.0015wt%, N≤25ppm through the dark carbonization treatment of RH, calm tapping;
The continuous casting of molten steel of C≤0.0015wt%, N≤25ppm obtains slab.
4. the working method of the effective steel band of copper facing precision welding according to claim 3 is characterized in that:
The vacuum tightness of the dark carbonization treatment of said RH less than time of 100Pa greater than 12 minutes; The said sedative time was greater than 30 minutes; Said continuous casting is the full guard casting, and the continuous casting nitrogen increased amount is below the 3ppm, and the slab nitrogen content guarantees superfluous Ti:0.03～0.04wt% below 30ppm.
5. the working method of the effective steel band of copper facing precision welding according to claim 1 is characterized in that step 2) after the heating of described slab, roughing, finish rolling obtain hot-rolled sheet, comprising:
The slab heating, tapping temperature is 1220-1300 ℃, be 3.0-4.0 hour heat-up time;
Slab again through two roller roughing of 1 passage and the four roller roughing of 5 passages, obtains intermediate blank through Fixed width pressing machine Fixed width;
Intermediate blank obtains hot-rolled sheet through 7 passage finish rolling;
Batch rolling after the cooling of hot-rolled sheet laminar flow.
6. the working method of the effective steel band of copper facing precision welding according to claim 5 is characterized in that:
The total draft of said roughing is greater than 83%, and the last frame percentage pass reduction of said 7 passage finish rolling is greater than 10%;
Launch stay-warm case between said roughing and the said finish rolling, and adopt lubrication and rolling;
The roughing temperature out of said hot-rolled sheet is that 1070-1100 ℃, finishing temperature are that 900-950 ℃, coiling temperature are 680-720 ℃;
The quick refrigerative mode of leading portion is adopted in said laminar flow cooling.
7. the working method of the effective steel band of copper facing precision welding according to claim 1 is characterized in that, the described hot rolled coil of step 3) coils into finished product through cold rolling, annealing, after smooth, comprising:
Pickling behind the hot rolled coil straightening scale breading is processed chill volume through tandem mills is cold rolling again;
After chill volume cleans decontamination, smooth through continuous annealing furnace annealing, levelling machine, batch again and be finished product.
8. the working method of the effective steel band of copper facing precision welding according to claim 7 is characterized in that:
Cold rolling draft when said hot rolled coil is cold rolling is 80-86%, and the smooth elongation control of said levelling machine is at 0.8-1.0%.
9. the working method of the effective steel band of copper facing precision welding according to claim 7 is characterized in that:
Said chill each section temperature when twisting in the continuous annealing furnace annealing is as shown in the table:
10. the working method of the effective steel band of copper facing precision welding according to claim 1 is characterized in that: the thickness specification of said finished product is 0.45-0.80mm; Its ys is that 170-230MPa, tensile strength are that 280-320MPa, elongation after fracture A50 are greater than 45.0%.
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Cited By (5)
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| CN103938077A (en) * | 2013-11-12 | 2014-07-23 | 首钢总公司 | Cold-rolled steel plate for double-layer coiling welded pipe and production method thereof |
| CN106702276A (en) * | 2016-12-23 | 2017-05-24 | 首钢总公司 | Manufacturing method for 65Mn steel plate |
| CN108504945A (en) * | 2017-02-27 | 2018-09-07 | 宝山钢铁股份有限公司 | A kind of high-strength precision welding tube steel and its manufacturing method |
| CN112899576A (en) * | 2021-01-15 | 2021-06-04 | 山东钢铁集团日照有限公司 | Cold-rolled steel plate for precision household electric welding pipe and production method thereof |
| CN114921724A (en) * | 2022-05-20 | 2022-08-19 | 武汉钢铁有限公司 | Steel plate for producing single-layer welded pipe for high-speed drawing and manufacturing method thereof |
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| CN1888114A (en) * | 2005-06-29 | 2007-01-03 | 宝山钢铁股份有限公司 | Soft tin-plate and its making process |
| CN102416404A (en) * | 2011-09-21 | 2012-04-18 | 首钢总公司 | Method for producing cold-rolled steel strips |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103938077A (en) * | 2013-11-12 | 2014-07-23 | 首钢总公司 | Cold-rolled steel plate for double-layer coiling welded pipe and production method thereof |
| CN106702276A (en) * | 2016-12-23 | 2017-05-24 | 首钢总公司 | Manufacturing method for 65Mn steel plate |
| CN108504945A (en) * | 2017-02-27 | 2018-09-07 | 宝山钢铁股份有限公司 | A kind of high-strength precision welding tube steel and its manufacturing method |
| CN112899576A (en) * | 2021-01-15 | 2021-06-04 | 山东钢铁集团日照有限公司 | Cold-rolled steel plate for precision household electric welding pipe and production method thereof |
| CN114921724A (en) * | 2022-05-20 | 2022-08-19 | 武汉钢铁有限公司 | Steel plate for producing single-layer welded pipe for high-speed drawing and manufacturing method thereof |
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| CN102747283B (en) | 2014-07-23 |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |