CN103074546B - Cold-rolled strip steel for condenser tube of refrigerator and manufacturing method thereof - Google Patents
Cold-rolled strip steel for condenser tube of refrigerator and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a cold-rolled strip steel for a condenser tube of a refrigerator and a manufacturing method for a cold-rolled steel plate and mainly aims to overcome the technical problem of poor matching between strength and toughness of a conventional condenser tube of a refrigerator. According to a technical scheme of the invention, the cold-rolled strip steel is characterized by comprising the following chemical components by mass: 0.001 to 0.003% of C, no more than 0.03% of Si, 0.10 to 0.20% Mn, no more than 0.015% of P, no more than 0.008% of S, 0.015 to 0.060% of Alt, 0.0004 to 0.001% of B and 0.020 to 0.040% of Ti, with the balance being Fe and inevitable impurity elements. The manufacturing method comprises the following steps: desulphurization pretreatment of molten iron, slag removal, smelting in a converter, refining in an RH furnace, continuous casting, hot rolling, laminar cooling, cold rolling and annealing, wherein a continuous casting sheet billet is heated to a temperature of 1000 to 1080 DEG C, initial rolling temperature of finish rolling is 950 to 1000 DEG C, a finishing rolling temperature of finish rolling is 930 to 950 DEG C, a compression ratio in a finish rolling stage is 80 to 86%, a coiling temperature during finish rolling is 600 to 660 DEG C, and a reduction rate of cold rolling is 80 to 90%. The cold-rolled strip steel provided in the invention is applicable to manufacturing of the condenser tube of the refrigerator.
Description
Technical field
The present invention relates to a kind of refrigerator prolong cold rolled strip, and relate to the manufacture method of this cold-rolled steel sheet.
Background technology
At present, refrigerator prolong is generally SPCC with cold rolled strip, the carbon content of this steel is relatively high, the scope of carbon content is also wider, carbon content control meets the requirements at 0.04-0.15%, carbon content fluctuation is larger, thereby cause the intensity of material and plasticity and toughness well not to mate, the stability of performance is also poor, increase the control difficulty of producing refrigerator prolong product facility, in production process, the diameter of refrigerator prolong product can not keep constant, thickness inequality, quality influence to product is larger, also directly affected the refrigeration of finished product refrigerator, reduce the work-ing life of refrigerator, increase user's use cost.In addition in the time that the diameter of prolong is less than 5mm, in tubulation process, need tube reducing moulding, this has higher requirement to plasticity and toughness, while production with SPCC, time have crackle or disconnected pipe phenomenon to occur, so produce, to have the refrigerator prolong cold rolled strip of intensity and the fine coupling of plasticity and toughness significant.
Retrieval is found, number of patent application is that the Chinese patent application that CN200410024758.5 name is called " cold rolling Glassed Steel and the manufacture method thereof with good scaling resistance and super deep drawing quality " provides a kind of cold rolling Glassed Steel and manufacture method thereof, this cold rolling Glassed Steel contains by weight percentage: carbon≤0.005%, silicon≤0.030%, manganese 0.10～0.30%, phosphorus≤0.015%, sulphur 0.010～0.050%, aluminium 0.020～0.050%, nitrogen 0.004～0.015%, titanium=4C+3.42N+1.5S+0.02～0.04%, surplus is iron and other inevitable impurity.This contrast patent
(1) chemical composition:contrast patent adopts high S, high N and high Ti composition system in the time of Composition Design, to improve the scaling resistance energy of steel, contains more S, N and Ti element in steel, complex manufacturing, and production cost is higher.Record according to contrast patent specification, in order to improve the scaling resistance energy of steel, in steel, add excessive Ti element, can find out by embodiment, Ti content working control in steel is 0.08～0.12%, very high, in addition, also must improve the S in steel, the content of N element, to increase the quantity of second phase particles in steel, the scaling resistance energy that improves steel, embodiment S content is controlled at 0.024～0.035%, and embodiment N content is controlled at 0.004～0.009%.
(2) RH stove vacuum degassing treatment tech:contrast patent is in the time of Fruit storage, and its claim 3 and specification sheets are recorded, and adopt the method for nitrogen circulation to improve the nitrogen content in steel in Fruit storage, complex manufacturing, and more difficult accurate control, production cost is higher.
(3) annealing way:the cold rolling rear employing bell-type annealing furnace annealing of contrast patent, whole coil of strip after cold rolling entire volume the not uncoiling in the situation that is put into bell furnace, in order to eliminate the deformation crystal grain and the unrelieved stress that are elongated after cold deformation, make deformation crystal grain be recrystallized into uniform equi-axed crystal, must be through reaching the anneal of tens hours, heating, cooling efficiency are extremely low, and production cost is higher, plate shape with steel is also poor, and shape wave is comparatively serious; Its claim 4 and specification sheets are recorded, bell-type annealing adopts tight volume annealing, because the anneal time is longer, in order to ensure that the coil of strip after annealing has certain intensity, annealing temperature is unsuitable too high, general control is below 710 DEG C, and the annealing temperature of its 10 embodiment is all controlled at 700 DEG C, does not cover annealing temperature 680-750 DEG C of whole temperature range in its claim 4.
(4) hot rolling slab Heating temperature:the Heating temperature of slab is to affect AlN in aluminium killed steel to separate out and the important factor of solid solution, the cold rolling rear employing cover annealing of contrast patent, in order to ensure that the coiled sheet after annealing has certain intensity, be unlikely to too soft, must make AlN in hot rolling slab in solid solution condition, and remain into annealing always and control it when cooling and separate out, the Heating temperature of slab is higher, and according to above-mentioned requirements, the heating and temperature control of its slab is 1100-1250 DEG C of scope, energy consumption is high, is unfavorable for saving energy and reduce the cost.
(5) finish rolling start rolling temperature:contrast patent is owing to adopting higher slab heating temperature, so start rolling temperature is also higher, although not explanation in specification sheets.
(6) hot rolling reeling temperature:hot rolling reeling temperature is one of key factor affecting mechanical property, because coiling temperature has influence on the precipitation process of nitride and carbide, particularly separating out of AlN, the cold rolling rear employing cover annealing of contrast patent, annealing temperature is lower, for this reason, must reduce the recrystallization temperature of cold-reduced sheet, coiling temperature should suitably improve, and is 680-760 DEG C.
(7) cold rolling:the cold rolling draft of contrast patent is less, and the cold rolling draft of its 10 embodiment is controlled at 66-67.5%, and plate shape is poor, produces thickness limited, can not produce the product of thin specification.
(8) coiled sheet intensity:contrast the cold rolling rear employing bell-type annealing furnace annealing of patent, cause the low strength of cold rolling coil, yield strength is all less than 160MPa, and material is too soft, in refrigerator prolong moulding process, is only suitable for manual operation, is not suitable for mechanization production.
Summary of the invention
The object of the invention is to: exist intensity and toughness to mate bad shortcoming for prior art, it is within the scope of 180-230MPa that a kind of yield strength is provided, the refrigerator prolong cold rolled strip of hardness HR30T within the scope of 30-50, provide its manufacture method simultaneously, the method adopts low-carbon (LC), low silicon also adopts aluminium, titanium deoxidation and as grain refining element, and utilize inclusion morphology control, cooling and the continuous annealing temperature-controlled process of hot continuous rolling control is produced, thereby contribute to ensure steel yield strength of the present invention and hardness within the limits prescribed, there is high elongation after fracture simultaneously, good machine-shaping property, good welding property, the excellent comprehensive performances such as high performance-price ratio.
In order to reach above object, applicant, by repetition test and continuous theoretical analysis, designs refrigerator prolong of the present invention cold rolled strip chemical composition (mass percent) as shown in table 1:
Table 1 designing chemical composition (%)
| C | Si | Mn | P | S | Alt | B | Ti |
| 0.001~0.003 | ≤0.03 | 0.10~0.20 | ≤0.015 | ≤0.008 | 0.015~0.060 | 0.0004~0.001 | 0.020~0.040 |
Surplus is Fe and inevitable impurity element.
At refrigerator prolong of the present invention, with in cold rolled strip, the definite cause of each elemental composition is as follows:
[carbon]: carbon content affects intensity, plasticity, the punching performance of product.When carbon content is high, unit elongation is low, and forms inhomogeneous distorted area after distortion, and in recrystallization process, these distorted areas have promoted the forming core of random orientation recrystal grain, and { 111} is corresponding to be reduced favorable texture, and punching performance declines.Carbon content is low can not meet intensity, hardness requirement after cold rolled annealed.According to the intensity of material, hardness requirement, carbon content designs at 0.001-0.003%;
[silicon]: the low silicone content of low-carbon (LC) cold formability steel general requirement, be conducive to the follow-up coating performance of product on the one hand, on the other hand, the Al content that product has been had relatively high expectations, does not rely on the deoxidation of Si element.Therefore element silicon requires to be less than 0.03%;
[manganese]: the effect of manganese in cold-rolled steel is mainly strengthening and the effect of further eliminating the disadvantageous effect of S, and the scope of design of Mn is 0.10-0.20%;
[sulphur, phosphorus]: sulphur, phosphorus are all the harmful elements in steel, all wishes that in cold-rolled steel these two kinds of control of elements, in lower level, consider actual process controllability, S content requirement≤0.008%, P≤0.015%;
[aluminium]: the effect of aluminium in cold-rolled steel is extremely important, Al and N are in conjunction with generating AlN, AlN obtains the favourable { key factor of 111} texture and cheese crystal grain of cold-drawn performance in cold-reduced sheet annealing process, simultaneously due to the fixed action of AlN to N atom, make cold-reduced sheet there is good ageing resistance performance, Alt content requirement 0.015-0.060%;
[titanium]: Ti element is strong carbon, nitride forming element, can be completely fixed the interstitial atom such as carbon, nitrogen in steel, forms gapless atomic steel, to ensure having without ageing and super deep drawing quality.But Ti content can not be too high, too high Ti content can improve the recrystallization temperature of cold-rolled steel sheet, thereby needs higher annealing temperature, and Ti content is set as 0.020-0.040%;
[boron]: B can crystal grain thinning, favourable to the welding property of steel, and the generation of crackle can reduce drawing in refrigerator prolong production process time, improves lumber recovery, and B content is set as 0.0004-0.001%;
Refrigerator prolong of the present invention adopts conventional molten iron pre-desulfurization, converter top bottom blowing by the production method of cold rolled strip; the refining of RH stove; must ensure that the pure degassed time is greater than 8 minutes; continuous casting adopts ultra-low-carbon steel mold powder; whole process is blown Ar protective casting, obtains the refrigerator prolong cold rolled strip slab of aforementioned chemical composition.Its processing step is followed successively by: desulfurizing iron pre-treatment, skim, converter smelting, the refining of RH stove, continuous casting.
Above-mentioned refrigerator prolong by the hot rolling technology method of cold rolled strip is, the continuous casting steel billet that mentioned component is required is heated to 1000 DEG C～1080 DEG C, hot rolling is divided into two-part rolling technology, and wherein roughing is in the above rolling of recrystallization temperature, and finish rolling is in the interval rolling of non-recrystallization temperature.Rough rolling step is 5 passage tandem rollings, and finish rolling is 7 passage tandem rollings, and finish rolling start rolling temperature is 950 DEG C～1000 DEG C, and finish rolling end temp is 930 DEG C～950 DEG C.Finish rolling stage compression is than 80～86%, and after finish rolling, laminar flow cooling stages adopts back segment cooling, and coiling temperature is 600 DEG C～660 DEG C.
Above-mentioned refrigerator prolong by cold-rolling process and the continuous annealing process method of cold rolled strip is, by mentioned component and through the refrigerator prolong of hot rolling with coils of hot-rolled steel again uncoiling after overpickling is fallen scale on surface, on 5 Stands Cold Tandem Mills, carry out cold rolling, cold rolling draft is 80～90%, the steel band that rolls hard state after cold rolling obtains the finished product cold-rolled steel strip that thickness is 0.4～0.6mm after continuous annealing, annealing process is, steel band is 760～770 DEG C in the annealing region of the soaking zone of continuous annealing furnace, be 170～200s with steel in the time of soaking zone, after annealing, adopt flattening process, smooth unit elongation is 2.0～2.3%.
In refrigerator prolong of the present invention is manufactured with cold rolled strip, the theoretical foundation of each processing parameter is:
Continuous casting steel billet Heating temperature: if Heating temperature is too high, AlN in steel and Ti(C, N) etc. second phase particles again separate out precipitate more tiny, disperse in hot rolling reeling process after dissolving, suppress to grow up at recrystallize cold rolling, the rear crystal grain of annealing subsequently, the recrystallization temperature of steel plate is raise, can not adapt to low annealing temperature.If Heating temperature is too low, due to the natural temperature drop in course of hot rolling, cannot ensure the higher finishing temperature that the present invention requires.Continuous casting steel billet Heating temperature is set as 1000 DEG C～1080 DEG C;
Finish rolling start rolling temperature: finish rolling start rolling temperature of the present invention is 950 DEG C～1000 DEG C, in non-recrystallization temperature interval, is conducive to improve the over-all properties of product.The too high easy formation iron scale of finish rolling start rolling temperature, affects the surface quality of steel plate.Finish rolling start rolling temperature is too low can not ensure finish rolling end temp;
Finish rolling end temp: finishing temperature need be higher than Ar3 transformation temperature, but finishing temperature can not be too high, otherwise must improve the Heating temperature of continuous casting steel billet, increase energy consumption.Finish rolling end temp is set as 930 DEG C～950 DEG C;
Coiling temperature: hot rolling reeling temperature is one of key factor affecting mechanical property, because coiling temperature has influence on the precipitation process of nitride and carbide, particularly separating out of AlN, the present invention adopts continuous annealing, annealing temperature is higher, in order to ensure that the coiled sheet after annealing has certain intensity, it is 600～660 DEG C by hot rolling reeling temperature design;
Cold rolling draft: the present invention carries out cold rolling on 5 Stands Cold Tandem Mills, can control effectively to the tension force with steel, and cold rolling draft is set as 80～90%, and plate shape is better, can obtain good stamping performance;
Continuous annealing: the present invention adopts continuous annealing, by after the coil of strip uncoiling after cold rolling, in the situation that being with steel to have tension force, continuously pass through heat preservation zone, in order to make deformation crystal grain be recrystallized into uniform equi-axed crystal and to reach the effect of eliminating unrelieved stress, steel band is set as 760～770 DEG C in the annealing temperature of the soaking zone of continuous annealing furnace, be set as 170～200s with steel in the time of soaking zone, just can reach the effect that makes deformation crystal grain be recrystallized into uniform equi-axed crystal and eliminate unrelieved stress, it is fast that continuous annealing has band steel movement velocity, throughput is high, lumber recovery is high, heating efficiency is high, energy consumption is low, the advantages such as production cost is low, plate shape after annealing is better than cover annealing far away, the production control of more convenient downstream refrigerator prolong manufacturer, produce more good refrigerator prolong product.
The present invention has the following advantages: CN200410024758.5 compares with contrast patent: Composition Design of the present invention is simple, produce easily and control, S in steel, N element is as inevitable impurity element, according to conventional production process, just S can be controlled at below 0.008%, N is controlled at below 0.003%, the control of Ti content is also lower in addition, be 0.020～0.040%, the steel strength of this Composition Design and toughness coupling are better, there is high elongation after fracture simultaneously, good machine-shaping property, good welding property, the excellent comprehensive performances such as high performance-price ratio, the processing requirement of drawing moulding while having met preferably later process refrigerator prolong tubulation.The present invention, in the time of Fruit storage, adopts conventional treatment process, only needs the pure degassed time of guarantee to be greater than 8 minutes, just the impurity elements such as the N in steel can be reduced to the degree harmless to refrigerator prolong.The present invention adopts continuous annealing, by after the coil of strip uncoiling after cold rolling, in the situation that being with steel to have tension force, continuously pass through heat preservation zone, annealing temperature is controlled at 760～770 DEG C, be only 170～200s with steel in the time of heat preservation zone, just can reach the effect that makes deformation crystal grain be recrystallized into uniform equi-axed crystal and eliminate unrelieved stress, it is fast that continuous annealing has band steel movement velocity, throughput is high, lumber recovery is high, heating efficiency is high, energy consumption is low, the advantages such as production cost is low, plate shape after annealing is better than cover annealing far away, the production control of more convenient downstream refrigerator prolong manufacturer, produce more good refrigerator prolong product.The present invention adopts continuous annealing, can make AlN complete and separate out before continuous annealing, when hot rolling, can adopt lower slab heating temperature, thereby can stop the AlN having separated out in continuous casting process of cooling again to dissolve, for this reason, the Heating temperature of slab is designed to 1000 DEG C～1080 DEG C, has reduced energy consumption.Finish rolling start rolling temperature of the present invention is 950 DEG C～1000 DEG C, in non-recrystallization temperature interval, is conducive to improve the over-all properties of product.The present invention adopts continuous annealing, and annealing temperature is higher, in order to ensure that the coiled sheet after annealing has certain intensity, is 600～660 DEG C by hot rolling reeling temperature design.The present invention carries out cold rolling on 5 Stands Cold Tandem Mills, can effectively control the tension force with steel, cold rolling draft 80～90%, the raising of cold rolling draft, one side has reduced the recrystallization temperature of coil of strip, is conducive on the other hand fully develop punching press texture in annealing recrystallization process, improve the punching performance of finished steel coils, the rolled steel plate shape of producing is better, can produce the product of thin specification, and the belt steel thickness that the present invention produces is 0.4-0.6mm.The present invention is by rational design mix, hot-rolled temperature system and continuous annealing process system, the yield strength of the coiled sheet of producing is controlled within the scope of 180-230MPa, and this yield strength is applicable to refrigerator prolong manufacturer and carries out the requirement of the high efficiency production of mechanize very much.The present invention adopts low-carbon (LC), low silicon and adopts aluminium, titanium deoxidation and as grain refining element in sum, and utilize the cooling and continuous annealing temperature control technology of inclusion morphology control, hot continuous rolling control to produce, make the yield strength of coiled sheet and hardness reach the scope of regulation, there is high elongation after fracture, good machine-shaping property, the good excellent comprehensive performance such as welding property, high performance-price ratio simultaneously.Refrigerator prolong of the present invention has following characteristics with cold rolled strip: 1, have good comprehensive mechanical property, yield strength is within the scope of 180-230MPa, and hardness HR30T is within the scope of 30-50, and plate shape is better, intensity and plasticity are better mated, and are applicable to the production of refrigerator prolong unit.2, have high elongation after fracture, good machine-shaping property, has ensured the refrigerator prolong product even thickness of producing, and steady quality has improved the use properties of product, makes welding quality be able to larger improvement.3, Composition Design is reasonable, not containing precious alloy element, adopts cooling controlling and rolling controlling process and continuous annealing temperature control technology to produce, and production technique is simple, and production cost is lower, and this technology can more easily be generalized to other relevant enterprises.The refrigerator prolong that the present invention obtains with cold rolled strip through 760～770 DEG C, after time is the continuous annealing of 170～200s soaking zone, the mechanical property of steel band is: yield strength Rel is 180～230MPa, tensile strength Rm is 300～350MPa, elongation after fracture >=49%, hardness HR30T is 30-50, and microstructure grain size number is I7.5～I8.5 level.
Brief description of the drawings
Fig. 1 is the metallographic microstructure photo of refrigerator prolong of the present invention cold rolled strip.
Embodiment
Below in conjunction with embodiment 1-4, the invention will be further described, in table 1.
Table 1 embodiment 1-4 chemical composition (weight percent %), surplus is Fe and inevitable impurity.
| Element | C | Si | Mn | P | S | Alt | B | Ti |
| Design | 0.001~0.003 | ≤0.03 | 0.10~0.20 | ≤0.015 | ≤0.008 | 0.015~0.060 | 0.0004~0.001 | 0.020~0.040 |
| Embodiment 1 | 0.0011 | 0.004 | 0.20 | 0.013 | 0.008 | 0.052 | 0.0008 | 0.039 |
| Embodiment 2 | 0.0019 | 0.003 | 0.15 | 0.011 | 0.007 | 0.020 | 0.0004 | 0.035 |
| Embodiment 3 | 0.0022 | 0.003 | 0.17 | 0.014 | 0.005 | 0.038 | 0.001 | 0.022 |
| Embodiment 4 | 0.0027 | 0.005 | 0.11 | 0.010 | 0.006 | 0.046 | 0.0006 | 0.028 |
According to the requirement of steel product ingredient design of the present invention, adopt molten iron pre-desulfurization, converter top bottom blowing; the refining of RH stove, ensures that the pure degassed time is greater than 8 minutes, continuous casting employing ultra-low-carbon steel mold powder; whole process is blown Ar protective casting, is cast into the continuous casting steel billet that 210mm is thick.
Its concrete technology step is followed successively by: desulfurizing iron pre-treatment, skim, converter smelting, the refining of RH stove, continuous casting.
Continuous casting steel billet after process furnace reheats, rolling on Continuous Heat tandem rolling mill, technology controlling and process is in table 2, by roughing milling train and finish rolling tandem rolling unit after recrystallization zone He Fei recrystallization zone controlled rolling, control coolingly, then batch, produce qualified hot-rolled sheet coil.
Table 2 embodiment of the present invention 1-4 hot rolling technology control parameter
| Hot Rolling Parameters | Slab heating temperature/DEG C | Finish rolling start temperature/DEG C | Finish rolling end temp/DEG C | Finish rolling compression ratio/% | Coiling temperature/DEG C |
| Set | 1000-1080 | 950-1000 | 930-950 | 80-86 | 600～660 |
| Embodiment 1 | 1050 | 980 | 940 | 85 | 660 |
| Embodiment 2 | 1080 | 1000 | 950 | 81 | 650 |
| Embodiment 3 | 1010 | 950 | 930 | 82 | 600 |
| Embodiment 4 | 1030 | 970 | 940 | 83 | 630 |
By mentioned component and through the refrigerator prolong of hot rolling with coils of hot-rolled steel again uncoiling after overpickling is fallen scale on surface, on 5 Stands Cold Tandem Mills, carry out cold rolling, cold rolling draft is 80～90%, the steel band that rolls hard state after cold rolling obtains the finished product cold-rolled steel strip that thickness is 0.4～0.6mm after continuous annealing, annealing process is, steel band is 760～770 DEG C in the annealing region of the soaking zone of continuous annealing furnace, be 170～200s with steel in the time of soaking zone, after annealing, adopt flattening process, smooth unit elongation is 2.0～2.3%.Process control parameter is in table 3.
Table 3 the present invention is cold rolling, annealing process control parameter
| Cold rolling, annealing parameter | Cold rolling draft/% | Annealing temperature/DEG C | Soaking zone time/s | Smooth unit elongation/% |
| Set | 80～90 | 760-770 | 170-200 | 2.0-2.3 |
| Embodiment 1 | 88 | 760 | 171 | 2.20 |
| Embodiment 2 | 86 | 770 | 180 | 2.11 |
| Embodiment 3 | 82 | 768 | 198 | 2.28 |
| Embodiment 4 | 80 | 766 | 186 | 2.05 |
Utilize the mechanical property of the refrigerator prolong cold rolled strip that aforesaid method obtains to be: yield strength Rel is 180～230MPa, tensile strength Rm is 300～350MPa, elongation after fracture >=49%, hardness HR30T is 30-50, microstructure grain size number is I7.5～I8.5 level, and metallurgical structure is shown in Fig. 1.Sampling detects mechanical property and micro-grain fineness number is graded in table 4.
The mechanical property of table 4 cold coiling sampling
| Performance index | Yield strength/MPa | Tensile strength/MPa | Elongation after fracture/% | Hardness HR30T | Grain fineness number |
| Embodiment 1 | 180 | 310 | 55 | 40 | I7.5 |
| Embodiment 2 | 205 | 335 | 53 | 43 | I7.5 |
| Embodiment 3 | 190 | 325 | 50 | 33 | I8.5 |
| Embodiment 4 | 230 | 350 | 49 | 45 | I8.0 |
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 requirement of the present invention.
Claims (3)
1.
onethe manufacture method of cold rolled strip for kind of refrigerator prolong, comprises desulfurizing iron pre-treatment, skims, converter smelting, the refining of RH stove, continuous casting, hot rolling, laminar flow are cooling, cold rolling, annealing, it is characterized in that:
Hot rolling technology method is, continuous casting steel billet chemical composition mass percent is as follows: C 0.001-0.003%, Si≤0.03%, Mn0.10-0.20%, P≤0.015%, S≤0.008%, Alt0.015 ~ 0.060%, B0.0004 ~ 0.001%, Ti0.020 ~ 0.040%, surplus is Fe and inevitable impurity element; Continuous casting steel billet is heated to 1000 DEG C～1080 DEG C, and hot rolling is divided into two-part rolling technology, and wherein roughing is in the above rolling of recrystallization temperature, and finish rolling is in the interval rolling of non-recrystallization temperature; Rough rolling step is 5 passage tandem rollings, and finish rolling is 7 passage tandem rollings, and finish rolling start rolling temperature is 950 DEG C～1000 DEG C, and finish rolling end temp is 930 DEG C～950 DEG C; Finish rolling stage compression is than 80～86%, and after finish rolling, laminar flow cooling stages adopts back segment cooling, and coiling temperature is 600 DEG C～660 DEG C;
Cold-rolling process and continuous annealing process method are, by mentioned component and through the refrigerator prolong of hot rolling with coils of hot-rolled steel again uncoiling after overpickling is fallen scale on surface, on 5 Stands Cold Tandem Mills, carry out cold rolling, cold rolling draft is 80～90%, and the steel band that rolls hard state after cold rolling obtains the finished product cold-rolled steel strip that thickness is 0.4～0.6mm after continuous annealing.
2. the manufacture method of cold rolled strip for refrigerator prolong according to claim 1, it is characterized in that annealing process is, steel band is 760～770 DEG C in the annealing region of the soaking zone of continuous annealing furnace, be 170～200s with steel in the time of soaking zone, after annealing, adopt flattening process, smooth unit elongation is 2.0～2.3%.
3. the manufacture method of cold rolled strip for refrigerator prolong according to claim 1, is characterized in that ensureing that the pure degassed time is greater than 8 minutes.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115183A (en) * | 1993-10-05 | 1996-01-17 | 日本钢管株式会社 | Continuously annealed and cold rolled steel sheet |
| CN101787486A (en) * | 2009-01-23 | 2010-07-28 | 宝山钢铁股份有限公司 | Baking-aging resistant colored steel plate/strip and manufacturing method thereof |
| CN101811134A (en) * | 2010-01-26 | 2010-08-25 | 宁波钢铁有限公司 | Manufacture method for preventing edge crack generated during low-carbon cold rolling of paper-thin strip steel |
-
2011
- 2011-10-25 CN CN201110327170.7A patent/CN103074546B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115183A (en) * | 1993-10-05 | 1996-01-17 | 日本钢管株式会社 | Continuously annealed and cold rolled steel sheet |
| CN101787486A (en) * | 2009-01-23 | 2010-07-28 | 宝山钢铁股份有限公司 | Baking-aging resistant colored steel plate/strip and manufacturing method thereof |
| CN101811134A (en) * | 2010-01-26 | 2010-08-25 | 宁波钢铁有限公司 | Manufacture method for preventing edge crack generated during low-carbon cold rolling of paper-thin strip steel |
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| CN103074546A (en) | 2013-05-01 |
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