CN114799420B - Repairing method of hot-rolled laminar cooling roller - Google Patents
Repairing method of hot-rolled laminar cooling roller Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000003466 welding Methods 0.000 claims abstract description 79
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 238000010791 quenching Methods 0.000 claims abstract description 52
- 230000000171 quenching effect Effects 0.000 claims abstract description 48
- 238000000227 grinding Methods 0.000 claims abstract description 30
- 238000000137 annealing Methods 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 238000007689 inspection Methods 0.000 claims abstract description 10
- 230000035515 penetration Effects 0.000 claims abstract description 10
- 238000005098 hot rolling Methods 0.000 claims abstract description 8
- 230000003746 surface roughness Effects 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 64
- 229910045601 alloy Inorganic materials 0.000 claims description 26
- 239000000956 alloy Substances 0.000 claims description 26
- 239000011159 matrix material Substances 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 229910052759 nickel Inorganic materials 0.000 claims description 14
- 238000004372 laser cladding Methods 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims description 9
- 239000002356 single layer Substances 0.000 claims description 9
- 239000011229 interlayer Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000007921 spray Substances 0.000 description 8
- 238000005299 abrasion Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
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- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
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Abstract
The invention discloses a repairing method of a hot rolling laminar cooling roller, which comprises the following steps: (1) rough turning: removing a roll surface fatigue layer; (2) and (3) checking: detecting the diameter and hardness of the roller surface, and performing penetration flaw detection; (3) and (3) gas shielded welding: preheating the laminar cooling roller before welding, wherein the preheating temperature is 250-300 ℃; build-up welding is carried out on the preheated roller; (4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 80-100 ℃/h, heating to 500-550 ℃, preserving heat for 4-6 h, and then cooling to below 150 ℃ along with the furnace, discharging and air cooling; (5) semi-finish turning: turning according to the diameter of a roller finished product, and reserving a margin of 0.1mm on a single side; (6) laser quenching: carrying out laser quenching on the roller surface after semi-finish turning; (7) and (3) fine grinding: grinding the quenched roll surface according to the size and the surface roughness of the laminar cooling roll required by the drawing; (8) and (3) final inspection: and checking the finished product roller after grinding. The method ensures that the repaired laminar cooling roller has better wear resistance, impact resistance and corrosion resistance, and has simple process and low production cost.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a repairing method of a hot rolling laminar cooling roller.
Background
The laminar cooling is positioned between the finishing mill and the coiling machine of the hot rolled strip steel production line and mainly plays a role in cooling the strip steel. The roller conveyor at this position is called a laminar cooling roller, which cools the strip steel to a certain temperature on the one hand and also plays a role in conveying the strip steel on the other hand. The laminar cooling roller is contacted with high-temperature band steel during working, the band steel moves very fast and is corroded by cooling water, so that the laminar cooling roller is required to have better high-temperature resistance, impact resistance, abrasion resistance and corrosion resistance. The main failure modes of the laminar cooling roller are roller surface damage, including abrasion, corrosion, peeling and the like, and the roller surface state directly influences the surface quality of strip steel and also influences the production of the whole production line. Therefore, in order to reduce the cost and increase the efficiency, steel mills want to improve the service life of the laminar flow roller on one hand and repair the laminar flow roller which fails to run down on the other hand.
At present, two main methods for strengthening the roll surface of a laminar cooling roll are provided, namely spray welding Ni60 nickel-based self-fluxing alloy and laser cladding iron-based wear-resistant alloy. Thus, the manner in which they are repaired is also generally two: firstly, directly spray-welding Ni60 nickel-based self-fluxing alloy, secondly, adopting low-carbon steel overlaying to recover the size, and then adopting laser cladding iron-based wear-resistant alloy to carry out surface strengthening. However, both of these repair methods have certain problems: the spray welding repair is actually realized by combining diffusion and a matrix, the matrix is hardly melted, the bonding strength is low and the matrix is easy to peel, the spray welding can only use self-fluxing alloy powder, the limitation is larger, and the cost is higher due to higher price of Ni60 self-fluxing alloy powder; the laser cladding repair is a mode of 'build-up welding and laser cladding', the process is complex, the production efficiency is low, the cost of the laser cladding process is high, and the cost is further improved by the mode of 'build-up welding and laser cladding'. With the continuous compression of spare parts costs of steel mills, a repair method of a laminar cooling roller with simple process and low cost is needed.
Disclosure of Invention
The invention aims to solve the problem of providing a repairing method of a hot-rolled laminar cooling roller, which ensures that the repaired laminar cooling roller has better wear resistance, impact resistance and corrosion resistance, and has simple process and low production cost.
The invention relates to a repairing method of a hot rolling laminar cooling roller, which comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, wherein the turning size is determined according to the hardness of the roll surface after rough turning, and stopping turning when the hardness of the roll surface is lower than 30 HRC;
(2) and (3) checking: detecting the diameter and hardness of the roller surface, and performing penetration flaw detection to ensure that the fatigue layer is removed cleanly and no defects such as cracks exist;
(3) and (3) gas shielded welding: preheating the laminar cooling roller before welding, wherein the preheating temperature is 250-300 ℃; build-up welding is carried out on the preheated roller;
(4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 80-100 ℃/h, heating to 500-550 ℃, preserving heat for 4-6 h, and then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning according to the diameter of a roller finished product, and reserving a margin of 0.1mm on a single side;
(6) laser quenching: carrying out laser quenching on the roller surface after semi-finish turning;
(7) and (3) fine grinding: grinding the quenched roll surface according to the size and the surface roughness of the laminar cooling roll required by the drawing;
(8) and (3) final inspection: and checking the finished product roller after grinding.
Wherein, in the gas shielded welding in the step (3): the preheating mode can be flame heating or heating by a heating furnace.
Wherein, in the gas shielded welding in the step (3): and determining the total thickness of the surfacing layer according to the difference between the diameter of the finished product of the roller and the diameter of the roller after rough turning, and further determining the number of surfacing layers.
Wherein, in the gas shielded welding in the step (3): the welding wire is an iron-based alloy, and comprises the following chemical components in percentage by mass: 12-15% Cr, 1-2% Mo, 1-2% Ni, 0.5-1.0% Mn, 0.40-0.50% C and the balance Fe.
Wherein, in the gas shielded welding in the step (3): the technological parameters of the surfacing are as follows: 220-280A current, 22-28V voltage, 450-650mm/min moving speed, 10-15L/min air flow, 200-300 ℃ interlayer temperature and 2.5-4mm single-layer thickness.
Wherein, step (6) laser quenching: the quenching process parameters are as follows: rectangular light spot size is 3.7X19 mm, laser power is 4.0-5.5 kW, scanning speed is 20-35 mm/s, and overlap ratio is 3% -6%.
Wherein, step (6) laser quenching: the layer depth of the laser quenching layer is 0.8-1.2 mm.
The method of the invention can also be used for the surface strengthening treatment of a new laminar cooling roller, and at the moment, the step (1) in the repairing method is changed into turning the outer circle of the roller to be smaller than the size of a finished product of the roller by 2-3 mm, and the step (2) is checked and deleted, and other steps are the same as those of the repairing method.
The principle and effect of the hot-rolling laminar cooling roller repairing method are as follows: 1. the welding wire used in gas shield welding is martensitic stainless steel, contains a certain amount of Mo element, and improves the wear resistance of the alloy while generating solid solution strengthening; the alloy contains a certain amount of Cr element, so that the corrosion resistance of the alloy is obviously improved, and carbide can be formed by the alloy and carbon element; the alloy contains a certain amount of Ni element, so that the plasticity of the alloy can be improved, and the corrosion resistance of the alloy can be improved; the alloy contains 0.4 to 0.5 percent of carbon element, and can separate out carbide which is dispersed and distributed, thereby obviously improving the wear resistance of the alloy; that is, the build-up welding layer not only has the function of recovering the size, but also has excellent wear resistance and corrosion resistance; 2. the carbon element with the content of 0.4-0.5% is designed for the build-up welding layer, because the hardness of the hardening layer can be ensured only when the carbon element reaches a certain content in consideration of the subsequent laser quenching, the hardness of the hardening layer can reach 60-65 HRC, and the wear resistance of the hardening layer is further improved; the needle-shaped martensite formed after laser quenching can also obviously improve the corrosion resistance; 3. the gas shield welding and laser quenching combined machining mode is adopted, so that the process is simple, the cost is low, and the efficiency is high; compared with spray welding Ni60, the bonding strength is higher, and the shock resistance is further ensured; compared with laser cladding, the production efficiency is higher, and the production cost is lower; 4. the processing method of gas shield welding and laser quenching is not reported in the literature at present, and is not only suitable for repairing laminar cooling rollers, but also can be popularized to roller repairing under similar working conditions, such as loop rollers, auxiliary winding rollers and the like.
Drawings
FIG. 1 is a flow chart of a hot rolled laminar cooling roll repair method of the present invention;
FIG. 2 is a metallographic photograph of an iron-based alloy overlay layer + quench layer of the present invention;
FIG. 3 is a microhardness profile for examples of the present invention and comparative examples.
Detailed Description
For a better understanding of the present invention, the materials and methods of the present invention will be described in further detail with reference to the following examples.
As shown in FIG. 1, the repairing method of the hot-rolled laminar cooling roller comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, wherein the turning size is determined according to the hardness of the roll surface after rough turning, and stopping turning when the hardness of the roll surface is lower than 30 HRC;
(2) and (3) checking: detecting the diameter and hardness of the roller surface, and performing penetration flaw detection to ensure that the fatigue layer is removed cleanly and no defects such as cracks exist;
(3) and (3) gas shielded welding: preheating the laminar cooling roller before welding, wherein the preheating temperature is 250-300 ℃; build-up welding is carried out on the preheated roller;
(4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 80-100 ℃/h, heating to 500-550 ℃, preserving heat for 4-6 h, and then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning according to the diameter of a roller finished product, and reserving a margin of 0.1mm on a single side;
(6) laser quenching: carrying out laser quenching on the roller surface after semi-finish turning;
(7) and (3) fine grinding: grinding the quenched roll surface according to the size and the surface roughness of the laminar cooling roll required by the drawing;
(8) and (3) final inspection: and checking the finished product roller after grinding.
Example 1
The laminar flow roller body is of the size ofThe matrix material is 45 steel, the original hardening layer is spray-welded Ni60 self-fluxing alloy, and the repairing method comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, and stopping turning when the hardness is lower than 30 HRC;
(2) and (3) checking: the actual roll surface size after turning is phi 296.9mm, and the penetration flaw detection roll surface is defect-free;
(3) and (3) gas shielded welding: preheating before welding in a flame heating mode, wherein the preheating temperature is 300 ℃; the thickness of the overlaying layer is 3.5mm; the welding wire comprises the following chemical components in percentage by mass: 15% Cr, 2% Mo, 2% Ni, 0.8% Mn, 0.45% C and the balance Fe; the welding process parameters are as follows: the current 270A, the voltage 27V, the moving speed 600mm/min, the air flow rate 12L/min, the interlayer temperature 250 ℃ and the single-layer thickness 3.5mm.
(4) Annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 100 ℃/h to 550 ℃, and preserving heat for 4 hours; then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning the outer circle of the roller to
(6) Laser quenching: carrying out laser quenching on the turned roll surface, wherein the technological parameters are as follows: rectangular light spot size is 3.7 multiplied by 19mm, laser power is 5.5kW, scanning speed is 30mm/s, overlap ratio is 4%, and layer depth after quenching is 1.0mm;
(7) and (3) fine grinding: according toRa1.6, grinding the quenched roll surface;
(8) and (3) final inspection: and checking the finished product roller after grinding.
In the embodiment, the composition design of the gas shielded welding wire mainly considers that the roller matrix is 45 steel, the carbon content of the roller matrix is 0.42-0.50%, the Cr content and the Ni content are not more than 0.25%, and the roller matrix does not contain Mo element; in consideration of the fact that the gas shielded welding has a certain dilution rate, welding wires with high Cr, ni and Mo element contents and medium carbon content are selected for ensuring the performance of a build-up welding layer.
In this embodiment, the selection basis of the technological parameters of gas shield welding and laser quenching is as follows: the diameter of the roller matrix is 300mm, the roller matrix belongs to larger size in laminar cooling rollers, and the thermal deformation is relatively smaller, so that the gas shield welding adopts larger heat input to improve the surfacing efficiency, the laser quenching adopts larger heat input to improve the efficiency, the depth of a hardening layer is deepened, the wear resistance is improved, and the service life of the roller is prolonged.
Example 2
The laminar flow roller body is of the size ofThe base material is 20 steel, the original hardening layer is laser cladding iron-based alloy, and the repairing method comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, and stopping turning when the hardness is lower than 30 HRC;
(2) and (3) checking: the actual roll surface size after turning is phi 257.4mm, and the penetration flaw detection roll surface is defect-free;
(3) and (3) gas shielded welding: preheating before welding in a flame heating mode, wherein the preheating temperature is 300 ℃; the thickness of the overlaying layer is 3.2mm; the welding wire comprises the following chemical components in percentage by mass: 15% Cr, 2% Mo, 1.9% Ni, 1.0% Mn, 0.50% C and the balance Fe; the gas shield welding process parameters are as follows: current 250A, voltage 25V, moving speed 500mm/min, air flow 12L/min, interlayer temperature 250 ℃ and single layer thickness 3.2mm;
(4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 80 ℃/h, heating to 500 ℃, and preserving heat for 4h; then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning the outer circle of the roller to
(6) Laser quenching: carrying out laser quenching on the turned roll surface, wherein the technological parameters are as follows: rectangular light spot size is 3.7 multiplied by 19mm, laser power is 4.7kW, scanning speed is 25mm/s, overlap ratio is 5%, and layer depth after quenching is 0.9mm;
(7) and (3) fine grinding: according toRa1.6, grinding the quenched roll surface;
(8) and (3) final inspection: and checking the finished product roller after grinding.
In the embodiment, the composition design of the gas shielded welding wire mainly considers that the roller matrix is 20 steel, the carbon content of the roller matrix is 0.17-0.23%, the Cr content is not more than 0.25%, the Ni content is not more than 0.30%, and the roller matrix does not contain Mo element; considering that the gas shielded welding has a certain dilution rate, in order to ensure the performance of a build-up welding layer, a welding wire with higher C, cr, ni, mo element content is selected.
In this embodiment, the selection basis of the technological parameters of gas shield welding and laser quenching is as follows: the diameter of the roller matrix is 260mm, and the roller matrix belongs to smaller size in laminar cooling rollers, so that gas shielded welding and laser quenching both adopt smaller heat input to prevent larger surfacing deformation.
Example 3
The laminar flow roller body is of the size ofThe matrix material is 16Mn steel, the original hardening layer is spray-welded Ni60 nickel-based self-fluxing alloy, and the repairing method comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, and stopping turning when the hardness is lower than 30 HRC;
(2) and (3) checking: the actual roll surface size after turning is phi 293.8mm, and the penetration flaw detection roll surface is defect-free;
(3) and (3) gas shielded welding: preheating before welding by adopting a furnace heating mode, wherein the preheating temperature is 300 ℃, and preserving heat for 6 hours; the thickness of the build-up layer is 5.2mm, and the build-up layer is divided into two layers; the welding wire comprises the following chemical components in percentage by mass: 15% Cr, 2% Mo, 2% Ni, 0.5% Mn, 0.50% C and the balance Fe; the gas shield welding process parameters are as follows: current 230A, voltage 23V, moving speed 550mm/min, air flow 15L/min, interlayer temperature 220 ℃ and single-layer thickness 2.6mm;
(4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 90 ℃/h to 550 ℃, and preserving heat for 6h; then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning the outer circle of the roller to
(6) Laser quenching: carrying out laser quenching on the turned roll surface, wherein the technological parameters are as follows: rectangular light spot size is 3.7 multiplied by 19mm, laser power is 5.2kW, scanning speed is 28mm/s, overlap ratio is 3%, and layer depth after quenching is 1.1mm;
(7) and (3) fine grinding: according toRa1.6, grinding the quenched roll surface;
(8) and (3) final inspection: and checking the finished product roller after grinding.
In the embodiment, the composition design of the gas shielded welding wire mainly considers that the roller matrix is 16Mn steel, the carbon content of the roller matrix is 0.13-0.19%, the Cr and Ni contents are not more than 0.30%, the roller matrix does not contain Mo element, and the Mn element content is higher and is 1.20-1.60%; in order to ensure the performance of the build-up welding layer, a welding wire with higher C, cr, ni, mo element content and lower Mn element content is selected in consideration of a certain dilution rate of gas shielded welding.
In this embodiment, the selection basis of the technological parameters of gas shield welding and laser quenching is as follows: the thickness of a single layer in gas shielded welding is 2.6mm, and the thickness is thinner, so that higher efficiency can be realized at lower heat input, and larger surfacing deformation is prevented; the diameter of the roller matrix is 300mm, and the roller matrix belongs to larger size in laminar cooling rollers and has smaller thermal deformation, so that the production efficiency is improved by adopting larger heat input during laser quenching, the depth of a hardening layer is deepened, the wear resistance is improved, and the service life of the roller is prolonged.
The performance of the roll surface of the hot-rolled laminar cooling roll obtained by using the repairing method of the invention is compared with that of the hot-rolled laminar cooling roll obtained by adopting spray welding of Ni60 nickel-based self-fluxing alloy:
the friction and wear test method comprises the steps of (1) adopting a self-made simple friction and wear tester, adopting GCr15 quenching steel balls as a counter friction pair at room temperature, carrying out circular motion in a motion mode with the load of 20N, rotating at 400r/min, testing for 1h, and determining the wear resistance through comparing the abrasion loss of test blocks before and after the test;
the bonding strength test is to adopt a shearing test mode, utilize the shearing force of the bonding section of the coating and the matrix to peel off the coating from the matrix, and measure the shearing strength of the coating;
(III) hardness testing microhardness measured using a Vickers hardness tester manufactured by Netherlands anew;
wherein the performance pairs of the frictional wear test and the bond strength test are shown in table 1; microhardness test results are shown in figure 2.
Table 1 comparison of the properties of the different samples
| Sample numbering | Weight loss on wear/g | Bond strength/MPa | Comprehensive performance |
| Example 1 | 0.00193 | 482 | Second |
| Example 2 | 0.00205 | 479 | Again |
| Example 3 | 0.00188 | 493 | Optimum for the production of a product |
| Comparative example of spray welding | 0.00237 | 371 | Worst case of |
As can be seen from Table 1, example 3 has the best overall performance, example 1 times, example 2 times, and all three are better than the spray welded Ni60 test block. As can be seen from FIG. 3, the hardness of the quenching layer is basically 690-830 HV, the hardness of the build-up layer is also 550HV or more, and the hardness of the spray-welded Ni60 is 590-690 HV, that is, the hardness of the quenching layer near the surface of each of examples 1, 2 and 3 is higher than that of the comparative example spray-welded Ni60.
As shown in fig. 2, the microstructure of both the quench layer and the weld overlay layer consisted of fine lath martensite + a small amount of retained austenite + fine carbides. The higher and finer martensite content of the quench layer compared to the weld overlay also indicates that the quench layer has higher hardness and better wear resistance.
Therefore, the laminar flow roller repaired by the method of gas shield welding and laser quenching can be prepared with a layer of abrasion-resistant and impact-resistant quenching layer on the surface, the hardness of the quenching layer is up to 60-65 HRC, the bonding strength with a matrix is more than or equal to 450Mpa, and the service life of the laminar flow roller is longer than that of repairing modes such as spray welding Ni60, laser cladding iron-based alloy and the like by about 20% after being used on line in a steel mill. Meanwhile, the method has the advantages of simple process, higher efficiency, low comprehensive cost and about 30 percent lower cost than laser cladding.
Claims (6)
1. A repairing method of a hot rolling laminar cooling roller comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, wherein the turning size is determined according to the hardness of the roll surface after rough turning, and stopping turning when the hardness of the roll surface is lower than 30 HRC;
(2) and (3) checking: detecting the diameter and hardness of the roller surface, and performing penetration flaw detection to ensure that the fatigue layer is removed cleanly and no defects such as cracks exist;
(3) and (3) gas shielded welding: preheating the laminar cooling roller before welding, wherein the preheating temperature is 250-300 ℃; build-up welding is carried out on the preheated roller; the welding wire is an iron-based alloy, and comprises the following chemical components in percentage by mass: 12-15% Cr, 1-2% Mo, 1-2% Ni, 0.5-1.0% Mn, 0.40-0.50% C and the balance Fe; the technological parameters of the surfacing are as follows: 220-280A of current, 22-28V of voltage, 450-650mm/min of moving speed, 10-15L/min of air flow, 200-300 ℃ of interlayer temperature and 2.5-4mm of single-layer thickness;
(4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 80-100 ℃/h, heating to 500-550 ℃, preserving heat for 4-6 h, and then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning according to the diameter of a roller finished product, and reserving a margin of 0.1mm on a single side;
(6) laser quenching: carrying out laser quenching on the roller surface after semi-finish turning; the quenching process parameters are as follows: rectangular light spot size is 3.7 mm by 19mm, laser power is 4.0-5.5 kW, scanning speed is 20-35 mm/s, and overlap ratio is 3% -6%; the layer depth of the laser quenching layer is 0.8-1.2 mm;
(7) and (3) fine grinding: grinding the quenched roll surface according to the size and the surface roughness of the laminar cooling roll required by the drawing;
(8) and (3) final inspection: and checking the finished product roller after grinding.
2. The repairing method of the hot-rolled laminar cooling roller according to claim 1, characterized by comprising the following steps: in the gas shielded welding of the step (3): the preheating mode can be flame heating or heating by a heating furnace.
3. The repairing method of the hot-rolled laminar cooling roller according to claim 1, characterized by comprising the following steps: in the gas shielded welding of the step (3): and determining the total thickness of the surfacing layer according to the difference between the diameter of the finished product of the roller and the diameter of the roller after rough turning, and further determining the number of surfacing layers.
4. A repairing method of a hot rolling laminar cooling roller is characterized by comprising the following steps: when the laminar flow roller body is of the size of The matrix material is 45 steel, the original hardening layer is spray-welded Ni60 self-fluxing alloy, and the repairing method comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, and stopping turning when the hardness is lower than 30 HRC;
(2) and (3) checking: the actual roll surface size after turning is phi 296.9mm, and the penetration flaw detection roll surface is defect-free;
(3) and (3) gas shielded welding: preheating before welding in a flame heating mode, wherein the preheating temperature is 300 ℃; the thickness of the overlaying layer is 3.5mm; the welding wire comprises the following chemical components in percentage by mass: 15% Cr, 2% Mo, 2% Ni, 0.8% Mn, 0.45% C and the balance Fe; the welding process parameters are as follows: 270A current, 27V voltage, 600mm/min moving speed, 12L/min air flow, 250 ℃ interlayer temperature and 3.5mm single-layer thickness;
(4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 100 ℃/h to 550 ℃, and preserving heat for 4 hours; then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning the outer circle of the roller to
(6) Laser quenching: carrying out laser quenching on the turned roll surface, wherein the technological parameters are as follows: rectangular light spot size is 3.7 multiplied by 19mm, laser power is 5.5kW, scanning speed is 30mm/s, overlap ratio is 4%, and layer depth after quenching is 1.0mm;
(7) and (3) fine grinding: according toRa1.6, grinding the quenched roll surface;
(8) and (3) final inspection: and checking the finished product roller after grinding.
5. A repairing method of a hot rolling laminar cooling roller is characterized by comprising the following steps: when the laminar flow roller body is of the size of The base material is 20 steel, the original hardening layer is laser cladding iron-based alloy, and the repairing method comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, and stopping turning when the hardness is lower than 30 HRC;
(2) and (3) checking: the actual roll surface size after turning is phi 257.4mm, and the penetration flaw detection roll surface is defect-free;
(3) and (3) gas shielded welding: preheating before welding in a flame heating mode, wherein the preheating temperature is 300 ℃; the thickness of the overlaying layer is 3.2mm; the welding wire comprises the following chemical components in percentage by mass: 15% Cr, 2% Mo, 1.9% Ni, 1.0% Mn, 0.50% C and the balance Fe; the gas shield welding process parameters are as follows: current 250A, voltage 25V, moving speed 500mm/min, air flow 12L/min, interlayer temperature 250 ℃ and single layer thickness 3.2mm;
(4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 80 ℃/h, heating to 500 ℃, and preserving heat for 4h; then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning the outer circle of the roller to
(6) Laser quenching: carrying out laser quenching on the turned roll surface, wherein the technological parameters are as follows: rectangular light spot size is 3.7 multiplied by 19mm, laser power is 4.7kW, scanning speed is 25mm/s, overlap ratio is 5%, and layer depth after quenching is 0.9mm;
(7) and (3) fine grinding: according toRa1.6, grinding the quenched roll surface;
(8) and (3) final inspection: and checking the finished product roller after grinding.
6. A repairing method of a hot rolling laminar cooling roller is characterized by comprising the following steps: when the laminar flow roller body is of the size of The matrix material is 16Mn steel, the original hardening layer is spray-welded Ni60 nickel-based self-fluxing alloy, and the repairing method comprises the following steps:
(1) rough turning: removing a roll surface fatigue layer, and stopping turning when the hardness is lower than 30 HRC;
(2) and (3) checking: the actual roll surface size after turning is phi 293.8mm, and the penetration flaw detection roll surface is defect-free;
(3) and (3) gas shielded welding: preheating before welding by adopting a furnace heating mode, wherein the preheating temperature is 300 ℃, and preserving heat for 6 hours; the thickness of the build-up layer is 5.2mm, and the build-up layer is divided into two layers; the welding wire comprises the following chemical components in percentage by mass: 15% Cr, 2% Mo, 2% Ni, 0.5% Mn, 0.50% C and the balance Fe; the gas shield welding process parameters are as follows: current 230A, voltage 23V, moving speed 550mm/min, air flow 15L/min, interlayer temperature 220 ℃ and single-layer thickness 2.6mm;
(4) annealing heat treatment: placing the deposited roller into a heating furnace, heating at a heating rate of 90 ℃/h to 550 ℃, and preserving heat for 6h; then cooling to below 150 ℃ along with the furnace, discharging and air cooling;
(5) semi-finish turning: turning the outer circle of the roller to
(6) Laser quenching: carrying out laser quenching on the turned roll surface, wherein the technological parameters are as follows: rectangular light spot size is 3.7 multiplied by 19mm, laser power is 5.2kW, scanning speed is 28mm/s, overlap ratio is 3%, and layer depth after quenching is 1.1mm;
(7) and (3) fine grinding: according toRa1.6, grinding the quenched roll surface;
(8) and (3) final inspection: and checking the finished product roller after grinding.
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