CN113564586A - Wear-resistant material for compositely manufacturing rolling mill centering guide plate in laser cladding mode and preparation method - Google Patents
Wear-resistant material for compositely manufacturing rolling mill centering guide plate in laser cladding mode and preparation method Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 89
- 239000000463 material Substances 0.000 title claims abstract description 55
- 238000004372 laser cladding Methods 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims description 9
- 238000005253 cladding Methods 0.000 claims abstract description 33
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 21
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 238000013461 design Methods 0.000 claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 10
- 229910000975 Carbon steel Inorganic materials 0.000 claims abstract description 8
- 239000010962 carbon steel Substances 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 abstract description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 239000010955 niobium Substances 0.000 description 18
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 14
- 238000005299 abrasion Methods 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 11
- 239000000956 alloy Substances 0.000 description 11
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000011651 chromium Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 239000010949 copper Substances 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 238000006748 scratching Methods 0.000 description 3
- 230000002393 scratching effect Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
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- 238000007790 scraping Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- HJIYJLZFNBHCAN-UHFFFAOYSA-N [V].[C] Chemical compound [V].[C] HJIYJLZFNBHCAN-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
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Abstract
The invention particularly relates to a wear-resistant material for compositely manufacturing a rolling mill centering guide plate by adopting a laser cladding mode. The wear-resistant material for the rolling mill centering guide plate compositely manufactured in the laser cladding mode comprises the following components in percentage by mass: cu: 20-50%, Zr: 0.5-1%, Cr: 5-13%, Fe: 15-40%, Nb: 2-9%, V: 1-5%, C: 0.5-2%, Si: 1 to 3 percent. The high-temperature wear resistant cladding layer powder for the centering guide plate of the rolling mill has reasonable powder proportion, meets the use requirement, has compact structure of the formed cladding layer without metallurgical defects such as cracks, air holes and inclusions, and has excellent performances of high-temperature water vapor corrosion resistance, high-temperature wear resistance and adhesion resistance. The invention adopts a laser cladding mode, carries out composite manufacturing aiming at the part with insufficient wear, designs and applies wear-resistant materials to strengthen the working part of the rolling mill centering guide plate, adopts economic carbon steel as the whole matrix, designs and manufactures the high wear-resistant rolling mill centering composite guide plate, prolongs the service life, ensures the production continuity and reduces the production cost.
Description
Technical Field
The invention relates to the field of laser cladding technology and preparation of wear-resistant materials of rolling mill centering guide plates, in particular to a wear-resistant material for compositely manufacturing a rolling mill centering guide plate in a laser cladding mode and a preparation method thereof.
Background
The rolling mill centering guide plates are positioned on two sides of front and rear conveying roller ways of the hot continuous rolling roughing mill, the medium plate roughing and finishing mill and the section roughing mill, and are mainly used for clamping and centering steel biting or steel tapping during billet rolling and preventing the billet from twisting and deviating during rolling. The centering guide plate of the rolling mill is directly contacted with the high-temperature billet, and the quality of the surface of the centering guide plate directly influences the quality of the rolled billet. The serious abrasion grooves on the surface of the centering guide plate of the rolling mill can cause the problems of over standard bending of the steel billet, edge scratch and burr, poor centering steel piling, failed clamping, steel falling and the like, and the product quality and the production efficiency are influenced.
At present, the centering guide plate of the rolling mill on the market mainly adopts on-line or off-line manual repair welding after the structure of the whole carbon steel plate is worn, and the working part has insufficient strength, low hardness and quick wear. At present, a centering guide plate of a plate blank rolling mill needs to be subjected to off-machine repair once every month due to the fact that a steel billet of a steel billet rolling mill is asymmetric, the steel billet is easy to bend and has higher clamping requirements, the two ends of an inlet and an outlet of the centering guide plate are scratched and abraded more seriously, the service life of the centering guide plate is shorter, the centering guide plate needs to be subjected to off-machine repair once every half month on average, the field overhaul frequency and the labor cost are increased, the steel rolling yield is reduced, and the performance cost is lower. At present, with the development of continuous rolling and the improvement of the product quality requirements of steel enterprises, how to improve the online service time and the service precision of the centering guide plate of the rolling mill and realize the research and development directions of large steel mills and metallurgical equipment manufacturers due to less maintenance and long continuous operation time.
In order to solve the problems of the centering guide plate of the rolling mill, the patent CN 204396479 discloses a large guide plate for a front and rear centering push bed of a roughing mill, which mainly researches the structure of a guide plate box body, so that the problem that the guide plate is not wear-resistant cannot be fundamentally solved, and only the working environment is locally improved; the patent CN 210253572 discloses a rolling mill centering guide plate, which is characterized in that a quenching and surfacing method is adopted on the guide plate to prolong the service life of the guide plate, but a welding material suitable for the conditions of the guide plate is not researched according to the working conditions of the rolling mill centering guide plate, so that the service life can be improved to a small extent, and the service life cannot be greatly improved and the production cost cannot be reduced.
Aiming at the special use condition of the centering guide plate of the rolling mill, the short service life of the centering guide plate of the rolling mill is caused by the insufficient high-temperature wear resistance of the surface part contacting the billet, if a laser cladding mode is adopted, the composite manufacturing is carried out aiming at the insufficient wear part, a wear-resistant material is designed and applied, so that the working part of the centering guide plate of the rolling mill is strengthened, the whole matrix adopts economic carbon steel, the centering composite guide plate of the high-wear-resistant rolling mill is designed and manufactured, the service life is prolonged, the production continuity is ensured, and the production cost is reduced.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a wear-resistant material for compositely manufacturing a rolling mill centering guide plate by adopting a laser cladding mode and a preparation method thereof. The high-temperature wear resistant cladding layer powder for the centering guide plate of the rolling mill has reasonable powder proportion, meets the use requirement, has compact structure of the formed cladding layer without metallurgical defects such as cracks, air holes and inclusions, and has excellent performances of high-temperature water vapor corrosion resistance, high-temperature wear resistance and adhesion resistance.
The invention adopts a laser cladding mode, carries out composite manufacturing aiming at the part with insufficient wear, designs and applies a wear-resistant material to strengthen the working part of the rolling mill centering guide plate, adopts economic carbon steel as the whole matrix, designs and manufactures the high wear-resistant rolling mill centering composite guide plate, prolongs the service life, ensures the production continuity and reduces the production cost. The high-precision long-life operation of the centering guide plate of the rolling mill is realized, the current service cycle is 0.5-1 month off line, the maximum abrasion loss can reach 10mm, and the centering guide plate is used in a later period without precision. The key point is that a high-temperature wear-resistant anti-scraping material is designed, the laser cladding composite manufacturing of the working part of the centering guide plate by the rolling mill is realized, and the problem that the production quality and the production efficiency are influenced by the quick abrasion of the guide plate is solved.
In order to achieve the purpose, the invention adopts the following technical scheme.
The wear-resistant material for the centering guide plate of the rolling mill is compositely manufactured in a laser cladding mode, comprises Cu, Zr, Cr, Fe, Nb, V, C and Si and comprises the following components in percentage by mass: cu: 20-50%, Zr: 0.5-1%, Cr: 5-13%, Fe: 15-40%, Nb: 2-9%, V: 1-5%, C: 0.5-2%, Si: 1 to 3 percent.
The method for compositely manufacturing the wear-resistant material of the rolling mill centering guide plate by adopting the laser cladding mode comprises the following specific steps: the structural design of the composite manufacturing of the rolling mill centering guide plate is shown in figure 1, carbon steel with high Q235 economy meeting the strength requirement is selected as a laser cladding base body, the position, which is determined to be in contact with a rolling material, on the rolling mill centering guide plate base body according to the use position of a rolling line is a laser cladding wear-resistant material area, grooving is carried out on the area, the groove depth is controlled according to the wear precision expected to be controlled by the rolling line, and the wear-resistant material can meet the composite manufacturing requirement of the depth within the range of 8mm-0.5 mm.
Further, the laser cladding process parameters are as follows:
power: 1200-2800W, spot diameter: 3.0-10 mm, powder placing thickness: 0.5-3 mm;
cladding thickness: the cladding layer with the thickness of 0.5-8mm can be realized by single-layer cladding or multi-layer cladding;
laser scanning speed: 18-46 mm/s, lap joint rate: 25% -75%;
protection: and covering the molten pool with high-purity argon gas for protection at 2L/min.
Compared with the prior art, the invention has the following beneficial effects.
The high-temperature wear-resistant cladding layer powder for the centering guide plate of the rolling mill, provided by the invention, has the advantages that the powder proportion is reasonable, the use requirement is met, the formed cladding layer has compact structure and does not have metallurgical defects such as cracks, air holes and inclusions, and the high-temperature wear-resistant cladding layer powder has excellent performances of high-temperature water vapor corrosion resistance, high-temperature wear resistance and adhesion resistance. A large number of experiments are carried out in the research process of the powder, a plurality of groups of experiments are carried out aiming at the performance requirements of high-temperature water vapor corrosion resistance and high-temperature abrasion resistance and adhesion resistance, the content ratio of carbon and vanadium is firstly verified, the hardness of an obtained alloy layer is less than HRC50 when the vanadium/carbon is lower than 2 for material component design, the hardness is further reduced after heat treatment, and the deviation of laser prepared alloy layer and powder components caused by dilution of a matrix and burning loss of carbon elements is discovered through component detection and comparison of design components. A plurality of groups of experiments prove that the vanadium-carbon ratio effect of the invention is excellent, which becomes the design basis of the impact-resistant wear-resistant material, and the experiment of perfect powder performance is carried out on the basis. Under the combined action of niobium and vanadium, crystal grains can be further refined, the grain size is reduced, the refinement of the crystal grains is promoted, the size of wear-resistant particles is refined, the impact resistance is greatly improved, and simultaneously, niobium carbide is distributed in a grain boundary, so that a certain pinning effect is realized on the structure, the strength of a mother phase of an alloy layer can be improved, and the alloy layer is ensured to have good wear resistance and impact resistance. The material design in the invention needs to simultaneously consider the proportions of vanadium/carbon, vanadium/niobium and niobium/carbon, and experimental data prove that the ratio of vanadium to niobium to carbon = 2: 4: 1-10: 18: 4. Therefore, the design of the content of the niobium element is also a key factor needed to be optimized in the material design, the content of the niobium is less than 2%, the grain refinement effect is not obvious, the content of the niobium is more than 9%, the carbide of the niobium can obviously aggregate to destroy the impact resistance of the laser cladding layer, and simultaneously, the redundant niobium can form an unstable compound with iron to further deteriorate the impact resistance of the structure, so that the content of the niobium is designed to be 2-9% optimally. The addition of chromium enables the alloy layer to have good corrosion resistance, and meanwhile, the solid solution strengthening of the residual chromium to the matrix can obviously improve the wear resistance and the content of the residual austenite, so that the requirement of an impact working condition is better met. The iron-based alloy is generally difficult to have both wear resistance and toughness, and when the carbon content and the alloy content are increased to increase the wear resistance, the aggregation and growth of alloy carbides are caused, the toughness of the alloy is deteriorated, and the impact resistance is reduced. The invention adopts the combined action of vanadium and niobium and optimizes the proportion of vanadium and niobium, so that the iron-based alloy manufactured by laser obtains a large amount of particles in dispersion distribution, and simultaneously, the good matching of vanadium, niobium and carbon ensures the dispersion distribution form of the particles without deteriorating the toughness, so that the iron-based alloy has good impact resistance and wear resistance.
The rolling mill is characterized in that a centering guide plate directly contacts a red hot steel billet with the temperature of 1180-1050 ℃, meanwhile, bending exists along with the extension of the length of the steel billet in the reciprocating rolling process, so that the contact stress of the steel billet and the guide plate is relatively large in use, and the guide plate is still and continuously contacted with the red steel in the contact process, so that the red hot steel billet is worn off at a high temperature. The rolling mill centering guide plate has the following characteristics in the summary working condition: high temperature for a long time: the material is required to have good high temperature red hardness; secondly, the guide plate statically bears the scratching of the steel billet: wear resistant particles requiring a material with high hardness; high-temperature water vapor: the material has certain corrosion resistance; high-temperature high-stress contact: the affinity between the material and the billet is poor, and the adhesion is prevented. The invention adopts a laser cladding mode, carries out composite manufacturing aiming at the part with insufficient wear, designs and applies a wear-resistant material to strengthen the working part of the rolling mill centering guide plate, adopts economic carbon steel as the whole matrix, designs and manufactures the high wear-resistant rolling mill centering composite guide plate, prolongs the service life, ensures the production continuity and reduces the production cost. The high-precision long-life operation of the centering guide plate of the rolling mill is realized, the current service cycle is 0.5-1 month off line, the maximum abrasion loss can reach 10mm, and the centering guide plate is used in a later period without precision. The key point is that a high-temperature wear-resistant anti-scraping material is designed, the laser cladding composite manufacturing of the working part of the centering guide plate by the rolling mill is realized, and the problem that the production quality and the production efficiency are influenced by the quick abrasion of the guide plate is solved.
The method for laser cladding of the wear-resistant material for the centering guide plate of the rolling mill, provided by the invention, has the advantages that firstly, the composite structure design is adopted, the partition reinforcement is adopted, the remanufacturing can be realized, and the worn part can be recycled for 2-5 times after being used, so that the resource and the cost are greatly saved; secondly, the material design aims at the special working condition design of the centering guide plate of the rolling mill, the friction is improved, the working condition temperature rise is reduced, and the heat conduction and the heat transmission are improved at the same time, so that the grinding environment of the centering guide plate piece, namely the billet and the rolling mill, is improved, and the addition of a large amount of copper plays a role in heat conduction; finally, wear-resistant particles are added, a large amount of hard particles are generated by using strong carbide forming elements such as niobium and vanadium, and the particles are coated by iron base under the condition of quick solidification by adding iron to form good performance transition and excellent toughness matching with copper. Therefore, on one hand, the high-temperature environment is improved, on the other hand, the wear-resistant high-toughness particles are added, so that the structure performance of the laser cladding composite material can realize the optimal high-temperature wear resistance, and the wear resistance of the material under the working condition is greatly improved.
Drawings
FIG. 1 is a structural diagram of the composite manufacturing of a centering guide plate of a rolling mill.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments. It will be readily understood by those skilled in the art that the following descriptions are only exemplary of the preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
The wear-resistant material for the centering guide plate of the rolling mill is compositely manufactured in a laser cladding mode, comprises Cu, Zr, Cr, Fe, Nb, V, C and Si and comprises the following components in percentage by mass: cu: 20-50%, Zr: 0.5-1%, Cr: 5-13%, Fe: 15-40%, Nb: 2-9%, V: 1-5%, C: 0.5-2%, Si: 1 to 3 percent.
The method for compositely manufacturing the wear-resistant material of the rolling mill centering guide plate by adopting the laser cladding mode comprises the following specific steps: the structural design of the composite manufacturing of the rolling mill centering guide plate is shown in figure 1, carbon steel with high Q235 economy meeting the strength requirement is selected as a laser cladding base body, the position, which is determined to be in contact with a rolling material, on the rolling mill centering guide plate base body according to the use position of a rolling line is a laser cladding wear-resistant material area, grooving is carried out on the area, the groove depth is controlled according to the wear precision expected to be controlled by the rolling line, and the wear-resistant material can meet the composite manufacturing requirement of the depth within the range of 8mm-0.5 mm.
Further, the laser cladding process parameters are as follows:
power: 1200-2800W, spot diameter: 3.0-10 mm, powder placing thickness: 0.5-3 mm;
cladding thickness: the cladding layer with the thickness of 0.5-8mm can be realized by single-layer cladding or multi-layer cladding;
laser scanning speed: 18-46 mm/s, lap joint rate: 25% -75%;
protection: and covering the molten pool with high-purity argon gas for protection at 2L/min.
Example 1.
In the process of rolling the profiles such as the rail and the like, billets can pass through 5-7 paths of reciprocating rolling in BD1 and BD2 rolling mills, and the use precision of the centering guide plate of the rolling mill is a key part for determining the centering property and whether scratches exist in the centering guide plate in the reciprocating rolling process. The side of the rail is placed on a roller conveyor in the rolling process, and the steel billet is seriously bent due to asymmetry in the rolling advancing direction, so that the centering guide plate of the rolling mill is severely abraded. The method comprises the following steps of designing a centering guide plate material of a rolling mill and carrying out composite manufacturing by using a proper laser cladding process to obtain a cladding structure with good cladding quality and no cracking defect, wherein the cladding material comprises the following main components in percentage by weight: is Cu: 48%, Cr: 5%, Zr: 0.6 percent; nb: 9%, V: 5%, C: 2%, Si: 2.4%, Fe: and (4) the balance. The width of the cladding position is 170mm, the depth of the laser cladding layer is 5mm, and 3 laser cladding layers are accumulated.
The laser cladding process parameters are as follows: power: 2300W, circular spot diameter: 4mm, single-layer powder placing thickness of 2.2mm, scanning speed: 25mm/s, lap joint ratio: 60 percent. After the cladding material of the centering guide plate of the rolling mill is subjected to laser cladding, not only is good cladding quality obtained, but also the abrasion resistance of the same proportion of the cladding material is 15 times that of the original material, the single online time is greatly improved, no intervention is needed in the using process, and the smooth edge of an abrasion trace has no risk of scratching a billet. The rolling mill centering guide plate manufactured by compounding the laser cladding wear-resistant material realizes high cost performance and long-period high-precision operation.
Example 2.
In the process of rolling the wide and thick plates, a rolling mill centering guide plate of a roughing mill directly contacts the edge of a plate blank, and the centering guide plate is a key component for determining the centering rolling performance and the edge quality of the plate blank. The edge of the plate blank is preferentially cooled in the rolling process, the abrasion position of the edge jumps up and down, the middle guide plate of the wide and thick plate rolling mill is compositely manufactured by adopting a laser cladding process, and a cladding structure with good cladding quality and no cracking defect is obtained, wherein the cladding material comprises the following main components in percentage by weight: cu: 42%, Cr: 5%, Zr: 0.8%, Nb: 6%, V: 3%, C: 1.5%, Si: 2.0%, Fe: and (4) the balance. The width of the cladding position is 190mm, the depth of the laser cladding layer is 4mm, and 2 layers are laser cladded.
The laser cladding process parameters are as follows: power: 2000W, circular spot diameter: 3.6mm, powder placing thickness of 2.2mm, scanning speed: 32mm/s, lap joint ratio: 60 percent. After the cladding material of the centering guide plate of the rolling mill is subjected to laser cladding, the good cladding quality is obtained, most importantly, the equivalent wear resistance of the cladding material is 13 times that of the originally used material, the single online time is greatly improved, the interference is not needed in the use process, the abrasion trace is smooth, the risk of scratching a billet is avoided, the steel sticking does not occur in the use process of the rolling of the centering guide plate, the abrasion position is kept at the same position, and the rolling stability is improved. The rolling mill centering guide plate manufactured by compounding the laser cladding wear-resistant material realizes high cost performance and long-period high-precision operation.
Claims (5)
1. The wear-resistant material for compositely manufacturing the centering guide plate of the rolling mill in a laser cladding mode is characterized by comprising the following components in percentage by mass: cu: 20-50%, Zr: 0.5-1%, Cr: 5-13%, Fe: 15-40%, Nb: 2-9%, V: 1-5%, C: 0.5-2%, Si: 1 to 3 percent.
2. A preparation method for compositely manufacturing a wear-resistant material of a rolling mill centering guide plate by adopting a laser cladding mode is characterized by comprising the following specific steps: according to the structural design of composite manufacturing of the centering guide plate of the rolling mill, carbon steel with high Q235 economy meeting the strength requirement is selected as a laser cladding base body, the position, which is determined to be in contact with a rolling material, on the base body of the centering guide plate of the rolling mill according to the use position of a rolling line is a laser cladding wear-resistant material area, grooving is carried out on the area, the groove depth is controlled according to the wear precision expected to be controlled by the rolling line, and the wear-resistant material can meet the composite manufacturing requirement of the depth within the range of 8mm-0.5 mm.
3. The preparation method of claim 2, wherein the laser cladding process parameters are as follows:
power: 1200-2800W, spot diameter: 3.0-10 mm, powder placing thickness: 0.5-3 mm;
cladding thickness: the cladding layer with the thickness of 0.5-8mm can be realized by single-layer cladding or multi-layer cladding;
laser scanning speed: 18-46 mm/s, lap joint rate: 25% -75%;
protection: and covering the molten pool with high-purity argon gas for protection at 2L/min.
4. The preparation method of the wear-resistant material for compositely manufacturing the rolling mill centering guide plate by adopting the laser cladding mode as claimed in claim 2, wherein the wear-resistant material comprises the following components in percentage by mass: cu: 48%, Cr: 5%, Zr: 0.6 percent; nb: 9%, V: 5%, C: 2%, Si: 2.4%, Fe: and (4) the balance.
5. The preparation method of the wear-resistant material for compositely manufacturing the rolling mill centering guide plate by adopting the laser cladding mode as claimed in claim 2, wherein the wear-resistant material comprises the following components in percentage by mass: cu: 40%, Cr: 5%, Zr: 0.8%, Nb: 6%, V: 3%, C: 1.5%, Si: 2.0%, Fe: and (4) the balance.
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