CN108588499B - CTP printing plate-based aluminum strip and preparation process thereof - Google Patents
CTP printing plate-based aluminum strip and preparation process thereof Download PDFInfo
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- CN108588499B CN108588499B CN201810323969.0A CN201810323969A CN108588499B CN 108588499 B CN108588499 B CN 108588499B CN 201810323969 A CN201810323969 A CN 201810323969A CN 108588499 B CN108588499 B CN 108588499B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/04—Printing plates or foils; Materials therefor metallic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
Abstract
The invention provides an aluminum strip for a CTP printing plate base and a preparation process thereof, wherein the aluminum strip comprises the following elements, by weight, 0.07 ~ 0.11.11% of Si, 0.3-0.4% of Fe, 0.12 ~ 0.18.18% of Mg, 0.015 ~ 0.036.036% of Mn, 0.002 ~ 0.004.004% of Zn, 0.01 ~ 0.02.02% of V, 0.011 ~ 0.014.014% of Ti, 0.001 ~ 0.005.005% of Cu, 0.006 ~ 0.009.009% of Cr, and the balance of aluminum, wherein the Ra value of the surface roughness of the strip is 0.15 ~ 0.25 μm, and the preparation process comprises raw material smelting, flat ingot casting, flat ingot heat treatment, preparation of low-temperature hot rolling rolls and preparation of the strip.
Description
Technical Field
The invention belongs to the technical field of CTP printing, and particularly relates to a preparation process of a CTP printing plate base blank.
Technical Field
The CTP (computer to plate) technology gradually replaces the traditional analog plate making mode due to its advantages of digitalization, high efficiency, high quality, simplicity, environmental protection, etc., and becomes a way for printing enterprises to realize technology upgrading. It is common in the market today to produce printing plate-based blanks from either hot rolled blank 1050 alloy or hot rolled blank 1052 alloy. After the raw material is subjected to hot rolling and cogging, nonmetallic inclusions (mainly sulfide and oxide, and also silicate) in the material are pressed into sheets, a layering (interlayer) phenomenon occurs, when the sheets are positioned on the surface of the material, the flatness of the surface is greatly damaged, and particularly when the hot rolled blank is used as a printing plate base blank, the longitudinal stripes on the surface of the obtained printing plate base blank are obvious, so that the quality of a printing plate is not guaranteed.
Disclosure of Invention
Aiming at the technical problems, the invention provides the CTP printing plate base aluminum strip and the preparation process thereof, the CTP printing plate base aluminum strip prepared by the method not only effectively improves the longitudinal stripes on the surface of the printing plate base blank, but also has excellent mechanical properties at normal temperature and high temperature, and in addition, the CTP printing plate base aluminum strip has the advantages of high elongation and strong corrosion uniformity, and can obviously improve the printing plate times of downstream customers and the quality of printing plates.
A CTP printing plate-based aluminum strip comprises the following elements in percentage by weight:
0.07 ~ 0.11.11% of Si, 0.3-0.4% of Fe, 0.12 ~ 0.18.18% of Mg, 0.015 ~ 0.036% of Mn, 0.02 ~ 0.04.04% of Zn, 0.01 ~ 0.02.02% of V, 0.011 ~ 0.014.014% of Ti, 0.01 ~ 0.05.05% of Cu, 0.006 ~ 0.009.009% of Cr, and the balance of aluminum, wherein the Ra value of the surface roughness of the strip is 0.15 ~ 0.25.25 μm.
The weight percentage of Mg in the aluminum strip of the CTP printing plate base is 0.14 ~ 0.16.16%, and the relative content ratio of Mg to Mn is (4 ~ 11): 1.
A preparation process of an aluminum strip based on a CTP printing plate comprises the following steps:
1) smelting raw materials, namely adding the furnace burden mixed according to the weight percentage into a smelting furnace, smelting at 720-800 ℃, wherein the smelting time is 120-180 minutes, stirring for 10 minutes when the furnace burden is melted to form uniform alloy melt, uniformly spreading a covering agent on the surface of the alloy melt, stirring for the second time when the temperature of the alloy melt is 700 ~ 720 ℃, blowing nitrogen into a refining agent for refining, wherein the nitrogen flow is 2.3-3.0 m, carrying out refining for 10 ~ 15 minutes, stirring for the 3 rd time after 30 minutes of refining, wherein the stirring time is 5 minutes, controlling the molten aluminum refining effect by adjusting the flow of inert gas through blowing refining, transferring the refining liquid into a standing furnace for standing when the temperature is 730 ~ 780 ℃, uniformly spreading a layer of covering agent on the surface of aluminum water in the standing furnace, carrying out refining stirring for 10 ~ 20 minutes every 60 minutes, standing for 240 minutes, adding a grain refining agent into the melt after standing, filtering the melt in a flow groove, filtering, and adding a coarse filtering plate for filtering with a mesh screen plate of 40 meshes at first.
2) Carrying out common semi-continuous casting on the melt obtained in the step 1), controlling the temperature of a front incubator to be 680-695 ℃, the casting speed to be 30 ~ 80mm/min, controlling the water inlet temperature of circulating cooling water to be less than or equal to 30 ℃, the final temperature to be less than or equal to 40 ℃ and the flow rate to be 3300 ~ 4400kg/min, wherein the thickness of the ingot is 480 ~ 520mm, and sawing the head and the tail of the ingot and milling the surface to obtain a flat ingot;
3) carrying out homogenization heat treatment on the slab ingot obtained in the step 2), wherein the heating temperature is 500-610 ℃, the heating speed is 1 ~ 2 ℃/min, the heat preservation time is 360 ~ 540min, the cooling speed is 0.5 ~ 1.5.5 ℃/min, the surface segregation width after treatment is lower than 500 μm, the preferable surface segregation width range is controlled to be 380 ~ 490 μm, the average grain size is smaller than 100 μm, the preferable grain size is controlled to be 70 ~ 95 μm, the columnar crystal size is smaller than 180 μm, the preferable columnar crystal size is controlled to be 130 ~ 160 μm, and the second phase compound size is smaller than 4 μm;
4) preparing a low-temperature hot rolled coil, namely performing low-temperature hot rolling treatment on the slab ingot subjected to heat treatment in the step 3), wherein the initial rolling temperature is 400-540 ℃, the final rolling temperature is 230 ~ 310 ℃, and the thickness of the hot rolled coil is 3.5-7.0 mm;
5) the preparation of the strip comprises the steps of controlling the reduction amount of each cold rolling pass to be 35% ~ 58%, controlling the tension before rolling to be 20-40 Mpa and the tension after rolling to be 8-25 Mpa, controlling the NAS pollution degree to be less than 5 grade by cold rolling oil, and controlling the kinematic viscosity value at 40 ℃ to be 2.0-2.5 mm in the rolling process2And/s, when the concentration of the additive is 5-8%, carrying out low-temperature annealing when the rolling thickness is 2.5mm, wherein the low-temperature annealing is carried out in two stages, namely, the first stage is carried out, the furnace gas temperature is increased to 490 ~ 500 ℃, then the temperature is reduced to the second stage at the speed of 1.5-2.5 ℃/min, the second stage is carried out, the furnace gas temperature is controlled to 460 ~ 480 ℃, the heat preservation time is 2-3 hours, the pressing is continuously carried out until the thickness of a finished product is 0.135-0.38 mm, and the finished product is subjected to stretching deformation correction ofAnd simultaneously carrying out surface cleaning and trimming, and taking the paper core to roll a finished product.
Through the technical scheme, the invention provides a whole set of preparation process of the CTP printing plate base aluminum strip, which not only improves the appearance quality of the strip, but also obviously improves the mechanical property of the strip, and innovatively endows the strip with the characteristic of uniform corrosion from the use of the strip. The following further analyses were carried out starting from the internal structure and the mechanical properties:
firstly, the addition of various elements in the alloy is controlled, the addition proportion is strictly controlled, particularly, the strip of the invention takes pure aluminum as a base material, alloy elements such as magnesium, manganese, iron, silicon, titanium and the like are added, the addition of the alloy elements ensures that the product has good mechanical property, particularly, the magnesium element has a pinning effect in the aluminum alloy, has a certain restraining effect with dislocation at a crystal boundary, optimizes the structure of the aluminum alloy, and further can improve the mechanical property of the aluminum alloy, and simultaneously, because the main alloy component is aluminum, the strip can be continuously ensured to have good extensibility, meanwhile, people pay attention to that the excessive magnesium element can ensure that the aluminum alloy has a certain cracking tendency, and along with higher mechanical property, the extensibility can be slightly reduced, so that the frequency of printing plates of downstream customers is reduced, the content of Mg in the invention is controlled to be 0.12 ~ 0.18.18%, on the basis of ensuring the good mechanical property when the strip is used as a CTP printing plate base, the cracking tendency of the product is strictly controlled, the surface of the produced strip is smooth and flat, and the defects such as bright and dark stripes and dark.
The applicant finds in research that when the relative contents of the Mg and the Mn elements in the strip are different, the actual enrichment degree difference of the Mg and the Mn elements on the surface of the strip is large, the surface energy or interface energy efficiency can enable Mg and Mn atoms to be obviously enriched on the surface of the aluminum-based strip, the difference of the surface enrichment of the Mg and the Mn elements is further increased, the standard potential of the Mg is-2.37V, and the standard potential is lower than that of the aluminum-1.66V, Mg is more susceptible to corrosion than the aluminum matrix when the sample is anodically corroded in an acidic solution, and Mg can form a corrosion microbattery with the aluminum matrix to promote corrosion. In addition, Mg tends to cause the formation of fine MgAl in aluminum2O4Composite oxide particles and Mg2Al3The particles are anode phases, and the electrode potential is positive to the aluminum matrix, so that the dissolution of the aluminum matrix around the impurity phases can be promoted, the corrosion positions are increased, and the formation of more fine corrosion holes is promoted. According to the invention, the enrichment degree of Mg element on the surface of the aluminum-based strip is directly influenced by regulating and controlling the relative contents of Mg and Mn element, so that the surface corrosion behavior of the aluminum-based strip is indirectly influenced. The strip material with the surface uniformly enriched with a large amount of Mg element has higher corrosion rate, and can ensure that a large amount of fine and dispersed corrosion holes are uniformly distributed on the surface in a short time. Due to the surface enrichment effect and the electrochemical corrosion effect of the alloy elements, the strip material of the invention forms different potential differences during electrolysis, and the electrolysis of each part is more uniform and uniform. When the CTP printing plate base is used for manufacturing a finished CTP plate for a downstream client, uniform and fine dispersed corrosion holes can obviously improve the adhesion performance of photosensitive or thermosensitive materials coated on the surface when the finished CTP plate is manufactured, and the quality and the efficiency of downstream coating operation are greatly improved; due to the special surface behavior of the Mg element, the electrolytic corrosion efficiency of the strip material with the surface enriched with a large amount of the Mg element is higher, the electric quantity can be saved by 10% under the same condition, and the leveling is easier. In addition to this: because downstream customers have plate baking requirements, the alloy strip disclosed by the invention not only has more excellent mechanical properties, but also widens the plate baking temperature: the alloy strip material of the invention greatly improves the tensile strength of the aluminum plate, and can retain higher strength after being processed by the same plate baking temperature compared with other similar products, or can bear higher plate baking temperature under the condition of reaching the same plate baking strength.
The alloy has high Mg, Zn and Cu contents, a large amount of nonequilibrium solidification crystal phases exist in an ingot prepared by common semi-continuous casting, and the alloy is very unfavorable for the later plastic processing of materials, the preparation process of the invention carries out homogenization heat treatment on the ingot before a hot rolling procedure, so that nonequilibrium crystal phases disappear, and a foundation is laid for obtaining a high-quality ingot blank.
Further, the final rolling temperature in the step 4) low-temperature hot rolling treatment process is 240-250 ℃, and the furnace gas temperature in the second stage is 462 ~ 470 ℃ in the step 5) low-temperature annealing process.
Furthermore, AlTiB wires with the diameter of 5 ~ 10mm are added in the step 1) of the method as grain refiners, and the hydrogen content is controlled to be less than or equal to 0.135ml/100gAl in the melt degassing process.
Further, in the rolling process in the step 5), the concentration of the additive is 5-8%, and the smoothness of the board surface is ensured; the synchronism of each roller system is controlled, the speed error between the roller system and the aluminum strip is less than 1%, and the roughness Ra value of the roller is 0.16-0.40 μm.
The invention has the beneficial effects that: 1. the invention controls the addition of various elements in the alloy, strictly controls the addition proportion, strictly controls the cracking tendency of the product on the basis of ensuring the good mechanical property of the strip used as a CTP printing plate base, and ensures that the surface of the manufactured strip is smooth and flat without the defects of light and shade stripes, water ripples and the like. 2. According to the invention, the enrichment degree of Mg element on the surface of the aluminum-based strip is directly influenced by regulating and controlling the relative contents of Mg and Mn element, so that the surface corrosion behavior of the aluminum-based strip is indirectly influenced. And due to the special surface behavior of Mg element, the strip material of the invention forms uniform, fine and dispersed corrosion holes in the downstream operation by electrolysis, thereby obviously improving the adhesion performance of photosensitive or thermosensitive materials coated on the surface and greatly enhancing the quality and efficiency of the downstream coating operation. 3. The preparation process of the invention carries out homogenization heat treatment on the cast ingot before the hot rolling procedure, so that the nonequilibrium crystal phase disappears, and the disadvantage of the addition of Mg, Zn and Cu alloy elements on the later plastic processing of the material is avoided. 4. The invention innovatively adopts the low-temperature hot rolling process, not only can refine the grain size in the metal, but also has no obvious aggregation phenomenon in the structure, reduces the surface adhesion damage during hot rolling, and obviously reduces the structure stripes. 5. The low-temperature annealing treatment of the invention greatly reduces the annealing temperature, reduces the energy consumption, greatly shortens the heating time during production, and lays a tamping foundation for improving the production efficiency and the product yield.
Detailed Description
The preparation process is further illustrated by the following examples.
The CTP printing plate-based aluminum strip comprises the following elements, by weight, 0.07 ~ 0.11.11% of Si, 0.3-0.4% of Fe, 0.12 ~ 0.18.18% of Mg, 0.015 ~ 0.036.036% of Mn, 0.002 ~ 0.004.004% of Zn, 0.01 ~ 0.02.02% of V, 0.011 ~ 0.014.014% of Ti, 0.001 ~ 0.005.005% of Cu, 0.006 ~ 0.009.009% of Cr, and the balance of aluminum, wherein the surface roughness Ra of the strip is 0.15 ~ 0.25.25 mu m.
Example 1
A CTP printing plate-based aluminum strip comprises the following elements in percentage by weight:
0.07 percent of Si, 0.3 percent of Fe, 0.12 percent of Mg, 0.015 percent of Mn, 0.002 percent of Zn, 0.01 percent of V, 0.011 percent of Ti, 0.001 percent of Cu, 0.006 percent of Cr and the balance of aluminum, and the surface roughness Ra value of the strip is 0.16 ~ 0.21.21 mu m.
The preparation process of the strip comprises the following steps:
1) smelting raw materials, namely adding the furnace burden mixed according to the weight percentage into a melting furnace, smelting at 720-800 ℃ to form uniform alloy melt, blowing nitrogen into a refining agent for refining at 700 ~ 720 ℃, wherein the nitrogen flow is 2.3-3.0 m/h, stirring after 30 minutes of refining, transferring the refining liquid into a standing furnace for standing when the temperature is 730 ~ 780 ℃, adding AlTiB wires with the diameter of 5 ~ 10mm into the melt after standing for refining as a grain refiner, controlling the hydrogen content to be less than or equal to 0.135ml/100gAl in the melt degassing process, and filtering the melt in a launder after degassing.
2) Carrying out common semi-continuous casting on the melt in the step 1), controlling the temperature of a front incubator to be 680-695 ℃, the casting speed to be 50 ~ 70mm/min, controlling the water inlet temperature of circulating cooling water to be less than or equal to 30 ℃, the final temperature to be less than or equal to 40 ℃ and the flow rate to be 3300 ~ 4400kg/min, wherein the thickness of the cast ingot is 500mm, and sawing the head, the tail and the face of the cast ingot to obtain a flat ingot;
3) carrying out homogenization heat treatment on the slab ingot obtained in the step 2), wherein the heating temperature is 500-610 ℃, the heating speed is 1 ~ 2 ℃/min, the heat preservation time is 360 ~ 540min, the cooling speed is 0.5 ~ 1.5.5 ℃/min, the surface segregation width after treatment is lower than 500 mu m, the average grain size is smaller than 100 mu m, the columnar crystal size is smaller than 180 mu m, and the size of the second phase compound is smaller than 4 mu m;
4) preparing a low-temperature hot rolled coil, namely performing low-temperature hot rolling treatment on the slab ingot pretreated in the step 3), wherein the initial rolling temperature is 400-540 ℃, the final rolling temperature is 230 ~ 310 ℃, and the thickness of the hot rolled coil is 3.5-7.0 mm;
5) the preparation of the strip comprises the steps of controlling the reduction of each cold rolling pass to be 35% ~ 58%, controlling the roughness Ra value of a roller to be 0.16-0.40 mu m, controlling the tension before rolling to be 20-40 Mpa and the tension after rolling to be 8-25 Mpa, controlling the NAS pollution degree to be less than 5 grade by cold rolling oil, and controlling the kinematic viscosity value at 40 ℃ to be 2.0-2.5 mm in the rolling process2(s) the concentration of the additive is 5-8%, and the light of the board surface is ensuredThe method comprises the steps of cleaning, controlling the synchronism of each roller system, enabling the speed error of the roller system and an aluminum strip to be less than 1%, carrying out low-temperature annealing when the rolling thickness is 2.5mm, and carrying out two stages of low-temperature annealing, wherein the first stage is to raise the temperature of furnace gas to 490 ℃, then cooling to the second stage at the speed of 1.5-2.5 ℃/min, controlling the temperature of the furnace gas to 460 ~ 480 ℃ at the second stage, keeping the temperature for 2-3 hours, continuously pressing until the thickness of a finished product is 0.135-0.38 mm, carrying out stretching deformation and plate shape correction through a pure stretcher line, simultaneously carrying out surface cleaning and edge cutting, and coiling the finished product with.
The product appearance quality is as follows: the thickness deviation is less than 0.005mm, the width deviation is less than 0.5mm, the convexity ratio is less than 0.24 percent, and the hydrogen content is less than 0.065mL/100 gAl; the surface of the strip material is smooth and has no strip-shaped scars, uniform color and luster, and no defects of light and shade stripes, water ripples and the like.
Example 2
This example differs from example 1 in that the strip contains, in weight percent, 0.11% Si, 0.4% Fe, 0.18% Mg, 0.036% Mn, 0.004% Zn, 0.02% V, 0.014% Ti, 0.006% Cu, 0.009% Cr, and the balance aluminum, and the strip has a surface roughness Ra value of 0.15 ~ 0.25.25 μm.
Step 4), the finishing temperature in the low-temperature hot rolling treatment process is 240 ~ 280 ℃;
in the low-temperature annealing process of the step 5), the furnace gas temperature of the second stage is 462 ~ 470 ℃.
The product appearance quality is as follows: the thickness deviation is less than 0.005mm, the width deviation is less than 0.5mm, the convexity ratio is less than 0.24 percent, and the hydrogen content is less than 0.065mL/100 gAl; the surface of the strip material is smooth and has no strip-shaped scars, uniform color and luster, and no defects of light and shade stripes, water ripples and the like.
Example 3
The difference between this example and example 1 is that the strip contains, in weight percentages, 0.08% Si, 0.035% Fe, 0.16% Mg, 0.025% Mn, 0.004% Zn, 0.02% V, 0.012% Ti, 0.003% Cu, 0.007% Cr and the balance aluminum, and the strip has a surface roughness Ra value of 0.18 ~ 0.22.22. mu.m.
Step 4), the final rolling temperature in the low-temperature hot rolling treatment process is 240-250 ℃;
in the low-temperature annealing process of the step 5), the temperature of the furnace gas in the second stage is 465 ℃.
The product appearance quality is as follows: the thickness deviation is less than 0.005mm, the width deviation is less than 0.5mm, the convexity ratio is less than 0.24 percent, and the hydrogen content is less than 0.065mL/100 gAl; the surface of the strip material is smooth and has no strip-shaped scars, uniform color and luster, and no defects of light and shade stripes, water ripples and the like.
Example 4
This example differs from example 1 in that the strip contains, in weight percentages, 0.08% Si, 0.035% Fe, 0.14% Mg, 0.018% Mn, 0.004% Zn, 0.02% V, 0.012% Ti, 0.003% Cu, 0.007% Cr and the balance aluminium, the strip having a surface roughness Ra value of 0.18 ~ 0.22.22. mu.m.
Carrying out homogenization heat treatment on the slab ingot obtained in the step 2), wherein the heating temperature is 540-590 ℃, the heating speed is 1 ~ 1.5.5 ℃/min, the heat preservation time is 390 ~ 540min, the cooling speed is 1 ~ 1.5.5 ℃/min, the surface segregation width range is controlled to be 380 ~ 490 mu m, the grain size is controlled to be 70 ~ 95 mu m, the columnar grain size is controlled to be 130 ~ 160 mu m, and the size of a second phase compound is smaller than 4 mu m.
Step 4), the final rolling temperature in the low-temperature hot rolling treatment process is 240-250 ℃;
in the low-temperature annealing process of the step 5), the temperature of the furnace gas in the second stage is 465 ℃.
The product appearance quality is as follows: the thickness deviation is less than 0.005mm, the width deviation is less than 0.5mm, the convexity ratio is less than 0.24 percent, and the hydrogen content is less than 0.065mL/100 gAl; the surface of the strip material is smooth and has no strip-shaped scars, uniform color and luster, and no defects of light and shade stripes, water ripples and the like.
Table 1 shows the product quality inspection indexes
| Tensile strength (Mpa) | Vickers Hardness (HV) | Elongation (%) | Baking temperature (. degree.C.) | Residual oil content (mg/m)2） | |
| Example 1 | 190 | 57 | 3 | 260 | ＜0.48 |
| Example 2 | 195 | 58 | 3.2 | 265 | ＜0.48 |
| Example 3 | 198 | 59 | 3.1 | 270 | ＜0.46 |
| Example 4 | 200 | 60 | 3 | 280 | ＜0.47 |
The technical index of the printing plate base is 0.27 +/-0.01 mm of the printing plate base as a detection example.
The plate baking temperature is the highest plate baking temperature which can ensure that the tensile strength in the parallel rolling direction is higher than 130Mpa and the tensile strength in the vertical rolling direction is higher than 135Mpa after heat preservation is carried out for 10 min.
Claims (4)
1. An aluminum strip based on CTP printing plates is characterized by comprising the following elements, by weight, 0.07 ~ 0.11.11% of Si, 0.3-0.4% of Fe, 0.12 ~ 0.18.18% of Mg, 0.015 ~ 0.036% of Mn, 0.002 ~ 0.004.004% of Zn, 0.01 ~ 0.02.02% of V, 0.011 ~ 0.014.014% of Ti, 0.001 ~ 0.005.005% of Cu, 0.006 ~ 0.009.009% of Cr, and the balance of aluminum, wherein the Ra value of the strip surface roughness is 0.15 ~ 0.25.25 mu m, and the aluminum strip comprises the following steps:
1) smelting raw materials, namely adding the furnace burden mixed according to the weight percentage into a melting furnace, smelting at 720-800 ℃ to form uniform alloy melt, blowing nitrogen into a refining agent for refining at 700 ~ 720 ℃, wherein the nitrogen flow is 2.3-3.0 m/h, stirring after 30 minutes of refining, transferring the refining liquid into a standing furnace for standing when the temperature is 730 ~ 780 ℃, adding a grain refiner into the melt after the refining and standing, degassing the melt, and filtering in a flow channel;
2) carrying out common semi-continuous casting on the melt obtained in the step 1), controlling the temperature of a front incubator to be 680-695 ℃, the casting speed to be 30 ~ 80mm/min, controlling the water inlet temperature of circulating cooling water to be less than or equal to 30 ℃, the final temperature to be less than or equal to 40 ℃ and the flow rate to be 3300 ~ 4400kg/min, wherein the thickness of the ingot is 480 ~ 520mm, and sawing the head and the tail of the ingot and milling the surface to obtain a flat ingot;
3) carrying out homogenization heat treatment on the slab ingot obtained in the step 2), wherein the heating temperature is 500-610 ℃, the heating speed is 1 ~ 2 ℃/min, the heat preservation time is 360 ~ 540min, the cooling speed is 0.5 ~ 1.5.5 ℃/min, the surface segregation width after treatment is lower than 500 mu m, the average grain size is smaller than 100 mu m, the columnar crystal size is smaller than 180 mu m, and the size of the second phase compound is smaller than 4 mu m;
4) preparing a low-temperature hot-rolled coil: carrying out low-temperature hot rolling treatment on the slab ingot subjected to heat treatment in the step 3), wherein the initial rolling temperature is 400-540 ℃, the final rolling temperature is 240-250 ℃, and the thickness of a hot rolled coil is 3.5-7.0 mm;
5) the preparation of the strip comprises the steps of controlling the reduction amount of each cold rolling pass to be 35% ~ 58%, controlling the tension before rolling to be 20-40 Mpa and the tension after rolling to be 8-25 Mpa, controlling the NAS pollution degree to be less than 5 grade by cold rolling oil, and controlling the kinematic viscosity value at 40 ℃ to be 2.0-2.5 mm in the rolling process2 And/s, the concentration of the additive is 5-8%, the low-temperature annealing is carried out when the steel is rolled to the thickness of 2.5mm, the low-temperature annealing is carried out in two stages, the first stage is carried out, the temperature of furnace gas is increased to 490 ~ 500 ℃, then the steel is cooled to the second stage at the speed of 1.5-2.5 ℃/min, the temperature of the furnace gas is controlled to 462 ~ 470 ℃, the heat preservation time is 2-3 hours, the steel is continuously pressed to the thickness of 0.135-0.38 mm of a finished product, the steel is subjected to stretching deformation and plate shape correction through a pure stretcher train, meanwhile, the surface cleaning and the edge cutting are carried out.
2. The CTP printing plate-based aluminum strip according to claim 1, wherein the weight percentage of Mg is 0.14 ~ 0.16.16%, and the ratio of the relative contents of Mg and Mn is (4 ~ 11): 1.
3. The CTP printing plate-based aluminum strip according to claim 1, wherein AlTiB wire with a diameter of 5 ~ 10mm is added as a grain refiner in step 1), and the hydrogen content is controlled to be less than or equal to 0.135ml/100gAl during melt degassing.
4. The CTP printing plate-based aluminum strip according to claim 1, wherein: step 5), in the rolling process, the concentration of the additive is 5-8%, and the smoothness of the plate surface is ensured; the synchronism of each roller system is controlled, the speed error between the roller system and the aluminum strip is less than 1%, and the roughness Ra value of the roller is 0.16-0.40 μm.
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| CN109252072B (en) * | 2018-10-15 | 2020-10-16 | 威海海鑫新材料有限公司 | High-precision aluminum foil blank and preparation process thereof |
| CN109277428B (en) * | 2018-10-15 | 2020-07-14 | 威海海鑫新材料有限公司 | Composite printed circuit board aluminum substrate strip and preparation process thereof |
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| CN112921213A (en) * | 2021-02-08 | 2021-06-08 | 威海海鑫新材料有限公司 | Aluminum foil blank with ultra-low pinhole count for aseptic packaging and preparation process thereof |
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