CN113913722A - Surface composite coating of mandrel for rolling seamless steel tube and preparation method thereof - Google Patents
Surface composite coating of mandrel for rolling seamless steel tube and preparation method thereof Download PDFInfo
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- CN113913722A CN113913722A CN202111115421.5A CN202111115421A CN113913722A CN 113913722 A CN113913722 A CN 113913722A CN 202111115421 A CN202111115421 A CN 202111115421A CN 113913722 A CN113913722 A CN 113913722A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 30
- 238000000576 coating method Methods 0.000 title claims abstract description 30
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 18
- 239000010959 steel Substances 0.000 title claims abstract description 18
- 238000005096 rolling process Methods 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000010410 layer Substances 0.000 claims abstract description 36
- 239000000956 alloy Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 15
- 230000007704 transition Effects 0.000 claims abstract description 15
- 229910001339 C alloy Inorganic materials 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000002344 surface layer Substances 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000012805 post-processing Methods 0.000 claims abstract description 7
- 230000037452 priming Effects 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000005488 sandblasting Methods 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 239000003350 kerosene Substances 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 6
- 238000007751 thermal spraying Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910001120 nichrome Inorganic materials 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- 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
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/123—Spraying molten metal
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/14—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying for coating elongate material
-
- 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a surface composite coating of a mandrel for rolling a seamless steel pipe, which consists of a priming layer, a transition layer and a surface layer: the bottom layer is made of common carbon alloy material and has the thickness of 3-8 mm; the transition layer is Ni-based alloy with the thickness of 0.01-0.05 mm; the surface layer is Ni-based alloy doped with WC and Cr in a certain proportion2C3Or their mixture, and the thickness is 0.03-0.2 mm. The invention discloses a preparation method of a surface composite coating of a mandrel for rolling a seamless steel pipe, which comprises the following specific stepsThe method comprises the following steps: (1) processing before overlaying; (2) surfacing; (3) performing heat treatment after surfacing; (4) processing after surfacing; (5) pretreatment before spraying; (6) supersonic spraying; (7) and (5) post-processing. The surface composite coating has good performance, high wear resistance, high corrosion resistance and high thermal fatigue resistance, and obviously prolongs the service life of the product.
Description
Technical Field
The invention relates to the field of core rod repairing methods, in particular to a surface composite coating of a core rod for rolling a seamless steel tube and a preparation method thereof.
Background
The core rod is a thermal deformation tool for rolling seamless steel pipes in a continuous rolling mill set, and is mainly used for perforating a billet by using the core rod at a high temperature. The working conditions of the core rod are extremely complex and severe: the hot rolling core rod has higher temperature during rolling and bears higher axial tensile stress and radial compressive stress; the core rod is in an unstable temperature field in the use process, the use temperature is up to over 1000 ℃, the surface temperature rise reaches 700 ℃, and the core rod is cooled by water after being used to bear cold-hot alternate circulation and thermal wear. Therefore, the core rod is required to have wear resistance, thermal fatigue resistance, and corrosion resistance. The primary failure mode of the core rod during use is localized cracking and excessive wear.
When the core rod fails, the core rod is generally repaired in order to save cost. At present, a core rod repairing method generally adopts a method of surfacing and electroplating, and the method mainly has the following defects: 1. the build-up welding adopts gradient build-up welding of various materials, the carbon content is high, the build-up welding manufacturability is poor; 2. the electroplated layer has low strength and is easy to wear and fall off. Meanwhile, the electroplating process has high pollution and does not meet the requirement of national green manufacturing.
Disclosure of Invention
The invention aims to provide a composite coating on the surface of a mandrel for rolling a seamless steel pipe and a preparation method thereof. The composite coating has good performance, high wear resistance, corrosion resistance and thermal fatigue resistance, and the service life of the product is obviously prolonged. Meanwhile, the whole repairing and manufacturing process is green and pollution-free.
The invention relates to a surface composite coating of a mandrel for rolling a seamless steel pipe, which consists of a priming layer, a transition layer and a surface layer: the bottom layer is made of common carbon alloy material and has the thickness of 3-8 mm; the transition layer is Ni-based alloy with the thickness of 0.01-0.05 mm; the surface layer is Ni-based alloy doped with WC and Cr in a certain proportion2C3Or their mixture, and the thickness is 0.03-0.2 mm.
The invention discloses a preparation method of a surface composite coating of a mandrel for rolling a seamless steel pipe, which comprises the following specific steps:
(1) processing before surfacing: machining the core rod by using a large numerical control lathe;
(2) surfacing: preparing a common carbon alloy material with the thickness of 3-8mm as a bottom layer by adopting a submerged arc welding process;
(3) heat treatment after surfacing: putting the core rod into a heating furnace, and annealing and stress-relieving;
(4) surfacing and post-processing: processing the core rod by a large numerical control lathe to ensure that the size of the core rod is 0.1-0.3mm smaller than the diameter of a finished product;
(5) pretreatment before spraying: cleaning or activating the core rod by using an organic solvent, alcohol and the like; pretreating the surface to be sprayed by adopting sand blasting, wherein the surface roughness Ra5-8 is obtained after sand blasting;
(6) supersonic spraying: preparing a Ni-based alloy transition layer with the thickness of 0.01-0.05mm by adopting spraying equipment; the Ni-based alloy with the thickness of 0.03-0.2mm is prepared by adopting spraying equipment and is doped with WC or Cr in a certain proportion2C3Or a mixture thereof;
(7) post-processing: and (3) polishing and grinding the surface of the core rod on a numerical control machine tool by adopting an abrasive belt, wherein the surface roughness Ra is less than or equal to 0.8.
Further, the steps (1), (2) and (3) are mainly used for repairing parts, firstly removing original fatigue layers and defects, and then restoring the size through overlaying.
Further, preheating is needed before surfacing in the step (2), a horizontal preheating furnace is used for preheating, a built-in constant-time monitoring thermocouple is arranged, the preheating temperature requirement is met, and meanwhile the phenomenon of uneven preheating is prevented.
Further, the surfacing material in the step (2) is a common carbon alloy material, and the surfacing thickness is determined according to the size requirement, so that the machining allowance is ensured.
Further, the temperature of the heat treatment after the surfacing in the step (3) is 500-.
Further, the spraying process parameters in the step (6) are as follows: the oxygen flow is 800-950L/min, the kerosene flow is 0.3-0.5L/min, the spraying distance is 350-400mm, and the powder feeding amount is 50-100 g/min.
Furthermore, the transition layer in the step (6) is preferably made of Ni-based alloy material, and the granularity is 15-53 um.
Further, the surface layer in the step (6) is preferably selected from Ni-based powder mixed with WC or Cr in a certain proportion2C3Or a mixture of the two, the particle size is 15-53 um.
Compared with the prior art, the invention has the advantages that: firstly, the surfacing material is a common carbon alloy material, is only used for recovering the size, has good welding manufacturability and strength, has low requirements on preheating and post-heating, and is not easy to generate the defects of cracks and the like; secondly, the surface strengthening layer is manufactured by adopting a thermal spraying technology, the requirement on the performance of the surfacing material is reduced, the process is easy to control by adopting a single-component surfacing layer, and meanwhile, the preparation method is green and pollution-free; thirdly, the thermal spraying technology has high efficiency and small heat input (less than 120 ℃), and the deformation problem of the core rod does not need to be considered in the manufacturing process; and fourthly, the used coating material combines the advantages of a spraying technology, combines the wear resistance, the corrosion resistance and the thermal fatigue resistance, and obviously prolongs the service life of the product.
Detailed Description
Example 1
The surface composite coating of the mandrel for rolling the seamless steel pipe consists of a priming layer, a transition layer and a surface layerThe composition is as follows: the bottom layer is made of common carbon alloy material and has the thickness of 3-8 mm; the transition layer is Ni-based alloy with the thickness of 0.01-0.05 mm; the surface layer is Ni-based alloy doped with WC and Cr in a certain proportion2C3Or their mixture, and the thickness is 0.03-0.2 mm.
Example 2
The invention discloses a preparation method of a surface composite coating of a mandrel for rolling a seamless steel pipe, which comprises the following specific steps:
(1) processing before surfacing: machining the core rod by using a large numerical control lathe;
(2) surfacing: preparing a common carbon alloy material with the thickness of 3-8mm as a bottom layer by adopting a submerged arc welding process;
(3) heat treatment after surfacing: putting the core rod into a heating furnace, and annealing and stress-relieving;
(4) surfacing and post-processing: processing the core rod by a large numerical control lathe to ensure that the size of the core rod is 0.1-0.3mm smaller than the diameter of a finished product;
(5) pretreatment before spraying: cleaning or activating the core rod by using an organic solvent, alcohol and the like; pretreating the surface to be sprayed by adopting sand blasting, wherein the surface roughness Ra5-8 is obtained after sand blasting;
(6) supersonic spraying: preparing a Ni-based alloy transition layer with the thickness of 0.01-0.05mm by adopting spraying equipment; the Ni-based alloy with the thickness of 0.03-0.2mm is prepared by adopting spraying equipment and is doped with WC or Cr in a certain proportion2C3Or a mixture thereof;
(7) post-processing: and (3) polishing and grinding the surface of the core rod on a numerical control machine tool by adopting an abrasive belt, wherein the surface roughness Ra is less than or equal to 0.8.
The method mainly aims at repairing parts, and comprises the steps of (1), (2) and (3), firstly removing an original fatigue layer and defects, and then restoring the size through overlaying.
Wherein, the preheating is needed before the surfacing in the step (2), the preheating is carried out by adopting a horizontal preheating furnace, a built-in constant-time monitoring thermocouple is arranged, the preheating temperature requirement is ensured to be met, and meanwhile, the phenomenon of uneven preheating is prevented.
And (3) the surfacing material in the step (2) is a common carbon alloy material, and the surfacing thickness is determined according to the size requirement, so that the machining allowance is ensured.
Wherein the temperature of the heat treatment after the surfacing in the step (3) is 500-550 ℃, and the heat preservation is carried out for 3-5 h.
Wherein, the spraying process parameters in the step (6) are as follows: the oxygen flow is 800-950L/min, the kerosene flow is 0.3-0.5L/min, the spraying distance is 350-400mm, and the powder feeding amount is 50-100 g/min.
Wherein, the transition layer in the step (6) is preferably made of Ni-based alloy material with the granularity of 15-53 um.
Wherein, the surface layer in the step (6) is preferably selected from Ni-based powder mixed with WC or Cr with a certain proportion2C3Or a mixture of the two, the particle size is 15-53 um.
In the execution process of the thermal spraying process, the selection can be carried out according to different working conditions, namely rolled steel pipe materials: for ordinary carbon steel pipes and stainless steel pipes, Ni-based alloy can be doped with WC, Cr2C3 or their mixture coating in different proportions to adjust the wear resistance and ductility and toughness of the coating.
Comparing the performance of the existing electroplated layer with the performance of the composite coating, the surface layer of the composite coating is Cr2C3-NiCr (mass ratio 3:1) and WC-NiCr (mass ratio 1:4) composite material.
The thermal shock resistance test: placing a sample (specification 50 x 20mm) into a muffle furnace at 800 ℃, keeping the temperature for 15min, taking out, quickly placing into room-temperature clean water, and repeating the steps; the number of macrocracks found for the first time is defined as the crack initiation number. The results are shown in table 1:
TABLE 1
| Serial number | Coating layer | Number of tests | Surface state |
| 1 | Electroplated coating | 20 | Visible cracks |
| 2 | Cr2C3-NiCr (3:1) coating | 28 | Without change |
| 3 | WC-NiCr (1:4) coating | 28 | Visible cracks |
TABLE 1
The experimental data show that the composite coating of the core rod has good thermal shock resistance.
(II) abrasion resistance test: and (3) adopting an MMS-2A microcomputer control abrasion tester to carry out a sliding abrasion experiment, and comparing weightlessness conditions under the same working condition and time. The results are shown in table 2:
TABLE 2
The experimental data show that the wear resistance of the composite coating of the core rod is good.
Thus, from a comparison of the respective properties of the composite coating coupon and the electroplated coating coupon, it can be derived: the thermal shock resistance and the abrasion resistance of the composite coating are far better than those of an electroplated layer, so that the service life of the seamless steel pipe core rod of the composite coating is at least 2 times of that of a seamless steel pipe core rod repaired by electroplating.
Compared with the prior art, the invention has the advantages that: firstly, the surfacing material is a common carbon alloy material, is only used for recovering the size, has good welding manufacturability and strength, has low requirements on preheating and post-heating, and is not easy to generate the defects of cracks and the like; secondly, the surface strengthening layer is manufactured by adopting a thermal spraying technology, the requirement on the performance of the surfacing material is reduced, the process is easy to control by adopting a single-component surfacing layer, and meanwhile, the preparation method is green and pollution-free; thirdly, the thermal spraying technology has high efficiency and small heat input (less than 120 ℃), and the deformation problem of the core rod does not need to be considered in the manufacturing process; and fourthly, the used coating material combines the advantages of a spraying technology, combines the wear resistance, the corrosion resistance and the thermal fatigue resistance, and obviously prolongs the service life of the product.
The preparation method is not limited to the repair of the mandrel for rolling the seamless steel tube, and the preparation method can be used for directly strengthening the surface of the mandrel when a new product of the mandrel for rolling the seamless steel tube is manufactured (from the step 4 of the repair method, and the surface composite coating is two layers, namely the transition layer and the surface layer), so that the service life of the mandrel is prolonged.
Finally, it should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention. Although the present invention has been fully described in the embodiments, it will be apparent to those skilled in the art that the method of the embodiments of the present invention can be modified, improved, etc. Therefore, modifications within the spirit and principle of the invention should be included in the scope of protection.
Claims (9)
1. The surface composite coating of the mandrel for rolling the seamless steel tube is characterized in that: it comprises a priming coat, a transition layer and a surface layer: the bottom layer is made of common carbon alloy material and has the thickness of 3-8 mm; the transition layer is Ni-based alloy with the thickness of 0.01-0.05 mm; the surface layer is Ni-based alloy doped with WC and Cr in a certain proportion2C3Or their mixture, and the thickness is 0.03-0.2 mm.
2. The preparation method of the surface composite coating of the mandrel for rolling the seamless steel pipe comprises the following specific steps:
(1) processing before surfacing: machining the core rod by using a large numerical control lathe;
(2) surfacing: preparing a common carbon alloy material with the thickness of 3-8mm as a bottom layer by adopting a submerged arc welding process;
(3) heat treatment after surfacing: putting the core rod into a heating furnace, and annealing and stress-relieving;
(4) surfacing and post-processing: processing the core rod by a large numerical control lathe to ensure that the size of the core rod is 0.1-0.3mm smaller than the diameter of a finished product;
(5) pretreatment before spraying: cleaning or activating the core rod by using an organic solvent, alcohol and the like; pretreating the surface to be sprayed by adopting sand blasting, wherein the surface roughness Ra5-8 is obtained after sand blasting;
(6) supersonic spraying: preparing a Ni-based alloy transition layer with the thickness of 0.01-0.05mm by adopting spraying equipment; the Ni-based alloy with the thickness of 0.03-0.2mm is prepared by adopting spraying equipment and is doped with WC or Cr in a certain proportion2C3Or a mixture thereof;
(7) post-processing: and (3) polishing and grinding the surface of the core rod on a numerical control machine tool by adopting an abrasive belt, wherein the surface roughness Ra is less than or equal to 0.8.
3. The method of claim 2, wherein: the steps (1), (2) and (3) are mainly aiming at the repair parts, firstly removing the original fatigue layer and the defects, and then restoring the size through overlaying.
4. The method of claim 2, wherein: preheating is needed before surfacing in the step (2), a horizontal preheating furnace is used for preheating, a thermocouple is arranged in the horizontal preheating furnace, the preheating temperature requirement is met, and meanwhile the phenomenon of uneven preheating is prevented.
5. The method of claim 2, wherein: and (3) the surfacing material in the step (2) is a common carbon alloy material, and the surfacing thickness is determined according to the size requirement, so that the machining allowance is ensured.
6. The method of claim 2, wherein: the temperature of the heat treatment after overlaying in the step (3) is 500-550 ℃, and the heat preservation is carried out for 3-5 h.
7. The method of claim 2, wherein: the spraying process parameters in the step (6) are as follows: the oxygen flow is 800-950L/min, the kerosene flow is 0.3-0.5L/min, the spraying distance is 350-400mm, and the powder feeding amount is 50-100 g/min.
8. The method of claim 2, wherein: the transition layer in the step (6) is preferably made of Ni-based alloy material, and the granularity is 15-53 um.
9. The method of claim 2, wherein: the surface layer in the step (6) is preferably selected from Ni-based powder mixed with WC or Cr with a certain proportion2C3Or a mixture of the two, the particle size is 15-53 um.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115055915A (en) * | 2022-06-01 | 2022-09-16 | 郑煤机智鼎液压有限公司 | Machining method for high-corrosion-resistance hydraulic oil cylinder guide sleeve and guide sleeve |
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| CN1793423A (en) * | 2005-09-22 | 2006-06-28 | 上海宝钢设备检修有限公司 | Process for compound treating heat spraying and depositing welding and products thereof |
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