CN110846653A - Method for strengthening wear-resistant layer on surface of steel conveying roller - Google Patents
Method for strengthening wear-resistant layer on surface of steel conveying roller Download PDFInfo
- Publication number
- CN110846653A CN110846653A CN201911018954.4A CN201911018954A CN110846653A CN 110846653 A CN110846653 A CN 110846653A CN 201911018954 A CN201911018954 A CN 201911018954A CN 110846653 A CN110846653 A CN 110846653A
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- Prior art keywords
- conveying roller
- strengthening
- wear
- steel conveying
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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
- C23C24/106—Coating with metal alloys or metal elements only
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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
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
The invention provides a method for strengthening a wear-resistant layer on the surface of a steel conveying roller, which is used for solving the technical problems of poor wear resistance, corrosion resistance and thermal fatigue resistance and complex repair process of the steel conveying roller in the prior art, and comprises the following steps: preparing materials, pretreating powder, cleaning a reinforced area and performing laser cladding. By implementing the technical scheme of the invention, the conveying roller is repaired by using the laser cladding technology, and compared with the traditional repairing means, the process is simple, convenient and quick, and the cost is low; the steel conveying roller has better wear resistance, corrosion resistance and thermal fatigue resistance by using the reinforced alloy powder with a specific proportion and a corresponding cladding process.
Description
Technical Field
The invention relates to the field of steel conveying rollers, in particular to a method for strengthening a wear-resistant layer on the surface of a steel conveying roller.
Background
The hot rolling conveying roller is a vulnerable part in a hot continuous rolling production line and consists of a plurality of conveying rollers, and the main reasons for the damage of the conveying rollers are the abrasion of iron oxide scales in high-speed operation and corrosion and thermal fatigue cracks caused by spraying cooling water. At present, the repair of the hot rolling conveying roller in China generally adopts nickel-based alloy repair. The manufacturing process uses a submerged arc surfacing repair technology, a thermal spraying technology or an electric brush plating technology, which are all complex, and the corrosion resistance and the thermal fatigue resistance of a repair layer are poor.
Therefore, a simple repair process for the conveying roller is needed, so that the conveying roller has better wear resistance, corrosion resistance and thermal fatigue resistance.
Disclosure of Invention
In order to solve the technical problem, the invention discloses a method for strengthening a wear-resistant layer on the surface of a steel conveying roller, which is implemented by the following steps:
a method for strengthening a wear-resistant layer on the surface of a steel conveying roller comprises the following steps: s1: preparing materials: preparing strengthening alloy powder; s2: powder pretreatment: drying the strengthened alloy powder; the reinforced alloy powder comprises the following elements in percentage by weight: 0.05 to 0.3 percent of C, 10 to 25 percent of Cr, 0.1 to 1.2 percent of Mo, 1.3 to 4.5 percent of Ni, 1.6 to 5 percent of Ti, 0.2 to 1.5 percent of Si, and the balance of Fe; s3: cleaning a strengthened area: polishing and cleaning a surface strengthening area of the steel conveying roller, and then drying; s4: laser cladding: laser cladding the strengthened region with a strengthened alloy powder.
Preferably, the method for strengthening the wear-resistant layer on the surface of the steel conveying roller further comprises the following step S0: strengthening area pretreatment: and carrying out flaw detection on the surface.
Preferably, in S4, in the laser cladding, the width of the light spot is 3-8mm, the length of the light spot is 12-26mm, the laser power is 1.8-3.6KW, and the moving speed of the light spot is 8-21 mm/S.
Preferably, in the method for strengthening the wear-resistant layer on the surface of the steel conveying roller, the thickness of the cladding layer is 0.4-1.6 mm.
Preferably, in S0, the method further comprises machining the surface to remove aged and thermal fatigue crack sites.
Preferably, in S3, the strengthening region is washed with clean water followed by acetone.
Preferably, the method for strengthening the wear-resistant layer on the surface of the steel conveying roller further comprises the following step S5: flaw detection: and detecting the flaw of the cladding layer.
By implementing the technical scheme of the invention, the technical problems of poor wear resistance, corrosion resistance and thermal fatigue resistance and complex repair process of the steel conveying roller in the prior art can be solved; by implementing the technical scheme of the invention, the conveying roller is repaired by using the laser cladding process, so that the process is simple; the wear resistance, the corrosion resistance and the thermal fatigue resistance of the steel conveying roller are improved by using the reinforced alloy powder with a specific proportion and a corresponding cladding process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only one embodiment of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a reinforcement method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment of the present invention, a method for strengthening a wear-resistant layer on a surface of a steel conveying roller, as shown in fig. 1, includes:
s0: strengthening area pretreatment: flaw detection is carried out on the surface, the surface is machined, and aging and thermal fatigue crack parts are removed;
s1: preparing materials: preparing strengthening alloy powder;
s2: powder pretreatment: drying and strengthening the alloy powder; the reinforced alloy powder comprises the following elements in percentage by weight: 0.16 percent of C; 19% of Cr; 0.6 percent of Mo; 2.5 percent of Ni; 2.35 percent of Ti; 0.65% of Si; fe 74.74%;
s3: cleaning a strengthened area: cleaning the reinforced area with clear water and acetone successively, drying and polishing the reinforced area;
s4: laser cladding: performing laser cladding on the reinforced area by using reinforced alloy powder;
s5: and (3) cooling: and waiting for the cladding layer to cool naturally.
In this embodiment, in S0, the surface of the conveying roller may be inspected by ultrasonic inspection or the like, and then the aged portion and the crack-containing portion of the strengthened region may be removed by a milling machine, and the gap may be filled by laser cladding, thereby improving the quality of the cladding layer and the strength of the joint between the cladding layer and the body of the strengthened region.
And S2, drying the prepared alloy powder in a vacuum drying oven at 150 ℃ for 2h to dry the moisture in the alloy powder and prevent the moisture from volatilizing to reduce the quality of a cladding layer in the laser cladding process.
In S3, firstly, washing off fat-soluble impurities on the surface of the strengthening region by using acetone, then washing off the surface of the strengthening region by using clear water, and removing solid particles and water-soluble impurities on the surface of the strengthening region; and after drying, polishing the surface of the reinforced area by using a pneumatic polishing machine, so as to conveniently clad a smooth cladding layer on the surface of the reinforced area by laser.
In S5, the cladding layer may be inspected by a means such as dye-penetrant inspection or ultrasonic inspection to detect the quality of the cladding layer. When the quality of the cladding layer is unqualified, the steps from S0 to S5 can be repeated, the old cladding layer is removed through machining, a new cladding layer is cladded, and the waste of the conveying roller is avoided.
In a preferred embodiment, in S4, in laser cladding, a German LaserlineLDF8000-60 semiconductor fiber laser is used, the width of a light spot is 6mm, the length of the light spot is 19mm, the laser power is 2.7KW, the moving speed of the light spot is 16mm/S, and a side blowing 13L/min Ar protection cladding area is used.
In a preferred embodiment, the method for strengthening the wear-resistant layer on the surface of the steel conveying roller is characterized in that the thickness of the cladding layer is 0.9 mm.
After laser cladding is finished, a cladding layer is subjected to performance test:
and (3) wear resistance test: an MMS-1G pin-disc type friction wear testing machine is used for carrying out a wear resistance test, the friction disc is made of GCr15 steel, the friction speed is 3m/s, the friction load is 140N, the test time is 300s, and the wear volume is 0.127-0.136mm3And has better wear resistance.
And (3) hardness testing: measuring microhardness of the cladding layer with HVS-1000A microhardness meter, taking 10 measuring points at different positions of the cladding layer, and measuring average hardness of the cladding layer to 843HV0.2The hardness of the conveying roller is 2.3 times of that of the conveying roller body, and the carrying capacity of the conveying roller is improved.
And (3) testing the wear resistance, the corrosion resistance and the thermal fatigue resistance: the conveying roller after laser cladding strengthening is used for operation, after 3000 hours, only a small amount of abrasion occurs on the surface, and the surface is slightly corroded after 6000 hours, does not have thermal fatigue performance, and has better corrosion resistance.
It should be understood that the above-described embodiments are merely exemplary of the present invention, and are not intended to limit the present invention, and that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A method for strengthening a wear-resistant layer on the surface of a steel conveying roller is characterized by using a laser cladding process technology and comprising the following steps:
s1: preparing materials: preparing strengthening alloy powder;
s2: powder pretreatment: drying the strengthened alloy powder; the reinforced alloy powder comprises the following elements in percentage by weight: 0.05 to 0.3 percent of C, 10 to 25 percent of Cr, 0.1 to 1.2 percent of Mo, 1.3 to 4.5 percent of Ni, 1.6 to 5 percent of Ti, 0.2 to 1.5 percent of Si and the balance of Fe;
s3: cleaning a strengthened area: cleaning a surface strengthening area of the steel conveying roller, drying and polishing;
s4: laser cladding: laser cladding the strengthened region with a strengthened alloy powder.
2. The method for strengthening the wear-resistant layer on the surface of the steel conveying roller according to claim 1, further comprising the step of S0: strengthening area pretreatment: and carrying out flaw detection on the surface.
3. The method for strengthening the wear-resistant layer on the surface of the steel conveying roller according to claim 2, wherein in S4, in laser cladding, the width of a light spot is 3-8mm, the length of the light spot is 12-26mm, the laser power is 1.8-3.6KW, and the moving speed of the light spot is 8-21 mm/S.
4. The method of claim 3, wherein the cladding layer has a thickness of 0.4 mm to 1.6 mm.
5. The method of claim 4, wherein S0 further comprises machining the surface to remove aged and thermal fatigue crack sites.
6. The method of claim 5, wherein in S3, the reinforced area is cleaned by sequentially using clean water and acetone.
7. The method for strengthening the wear-resistant layer on the surface of the steel conveying roller according to claim 6, further comprising S5: flaw detection: and detecting the flaw of the cladding layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911018954.4A CN110846653A (en) | 2019-10-24 | 2019-10-24 | Method for strengthening wear-resistant layer on surface of steel conveying roller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911018954.4A CN110846653A (en) | 2019-10-24 | 2019-10-24 | Method for strengthening wear-resistant layer on surface of steel conveying roller |
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| CN110846653A true CN110846653A (en) | 2020-02-28 |
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| CN201911018954.4A Pending CN110846653A (en) | 2019-10-24 | 2019-10-24 | Method for strengthening wear-resistant layer on surface of steel conveying roller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471993A (en) * | 2020-05-29 | 2020-07-31 | 燕山大学 | Laser cladding repair material for four rollers of sintering four-roller crusher and remanufacturing method |
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| CN101837524A (en) * | 2010-03-29 | 2010-09-22 | 樊琨 | Self-fused alloy powder for plasma spray welding |
| CN102453895A (en) * | 2010-10-26 | 2012-05-16 | 沈阳大陆激光成套设备有限公司 | Method for preparing heat-resistant and wear-resistant alloy coatings on surfaces of hot rolling plate fine rolling conveying rollers |
| CN103962550A (en) * | 2014-05-26 | 2014-08-06 | 山东能源机械集团大族再制造有限公司 | Alloy powder for laser cladding and preparation method thereof |
| CN108754489A (en) * | 2018-05-25 | 2018-11-06 | 金华华科激光科技有限公司 | A kind of method of iron based laser cladding powder and the laser melting coating powder |
| CN109351957A (en) * | 2017-12-25 | 2019-02-19 | 宁波中物东方光电技术有限公司 | Laser melting coating iron(-)base powder and preparation method thereof |
-
2019
- 2019-10-24 CN CN201911018954.4A patent/CN110846653A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837524A (en) * | 2010-03-29 | 2010-09-22 | 樊琨 | Self-fused alloy powder for plasma spray welding |
| CN102453895A (en) * | 2010-10-26 | 2012-05-16 | 沈阳大陆激光成套设备有限公司 | Method for preparing heat-resistant and wear-resistant alloy coatings on surfaces of hot rolling plate fine rolling conveying rollers |
| CN103962550A (en) * | 2014-05-26 | 2014-08-06 | 山东能源机械集团大族再制造有限公司 | Alloy powder for laser cladding and preparation method thereof |
| CN109351957A (en) * | 2017-12-25 | 2019-02-19 | 宁波中物东方光电技术有限公司 | Laser melting coating iron(-)base powder and preparation method thereof |
| CN108754489A (en) * | 2018-05-25 | 2018-11-06 | 金华华科激光科技有限公司 | A kind of method of iron based laser cladding powder and the laser melting coating powder |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471993A (en) * | 2020-05-29 | 2020-07-31 | 燕山大学 | Laser cladding repair material for four rollers of sintering four-roller crusher and remanufacturing method |
| CN111471993B (en) * | 2020-05-29 | 2021-06-29 | 燕山大学 | Laser cladding repair material for four rollers of sintering four-roller crusher and remanufacturing method |
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Application publication date: 20200228 |