CN114273674A - Method for manufacturing seamless steel pipe piercing plug through laser additive - Google Patents
Method for manufacturing seamless steel pipe piercing plug through laser additive Download PDFInfo
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- CN114273674A CN114273674A CN202111609005.0A CN202111609005A CN114273674A CN 114273674 A CN114273674 A CN 114273674A CN 202111609005 A CN202111609005 A CN 202111609005A CN 114273674 A CN114273674 A CN 114273674A
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Abstract
A method for manufacturing a seamless steel pipe piercing plug through laser additive manufacturing relates to the technical field of seamless steel pipe processing. The method comprises the following steps: s1, polishing the surface of the base body of the steel pipe piercing plug, and reserving the thickness of a working layer required by laser material increase; s2, cleaning the surface of the substrate to remove oil stains; s3, performing laser additive on the CoCrW alloy powder layer on the surface of the substrate, wherein the CoCrW alloy powder layer comprises the following chemical components in percentage by weight: 1.5 to 3.0% of carbon, 0.5 to 2.5% of silicon, 27.0 to 33.0% of chromium, 0 to 4.5% of iron, 1.0 to 3.0% of nickel, 10.0 to 15.0% of tungsten, 0.5 to 2.2% of molybdenum, 0.2 to 0.7% of manganese, 0.1 to 0.2% of vanadium, and the balance of cobalt and inevitable impurities. Compared with the prior art, the CoCrW alloy of the invention increases the contents of chromium and tungsten, and simultaneously increases vanadium, thereby effectively improving the heat resistance, hardness and heat strength of the coating. The hardness of the piercing plug reaches 600HV, the friction coefficient at high temperature (500 ℃) is only 0.18, and compared with a plug without additive materials, the service life of the piercing plug is prolonged from 100 to 500, and is improved by 5 times.
Description
Technical Field
The invention relates to the technical field of seamless steel pipe processing, in particular to a method for manufacturing a seamless steel pipe piercing plug through laser additive manufacturing.
Background
The output of the seamless steel tube in China is continuously increased for more than ten years, but the seamless steel tube is acid-resistant, cold-resistant, high-pressure-resistant and CO-resistant throughout the world2High quality seamless steel pipes are still in short supply. The piercing plug is one of the most consumption key tools in the production of seamless steel pipes, and bears great axial force, compressive stress, shear stress and surface friction force in the piercing process. In addition, the working conditions of the production of different types of seamless steel pipes are different, some plug heads need to be cooled by water after finishing one-time perforation, and some plug heads do not need to be cooled by water, so that the plug heads are easy to collapse, deform, crack and the like under the action of rapid cooling, rapid heating and rolling force. The quality and the service life of the piercing plug directly influence the quality, the production efficiency and the factory benefit of the seamless steel tube.
At present, alloy steel plugs are the plugs which are applied more at present and are roughly divided into 3 types of low alloy steel, medium alloy steel and high alloy steel. 20CrNi4, H13, 15Cr2Ni3MoW, high alloy A and cobalt-containing high alloy are 5 typical alloy steel plug materials, but the piercing plug manufactured by only using a single material has large loss and high cost.
In recent years, researchers have utilized laser additive manufacturing technology to manufacture piercing plugs, for example, CN103290410B a laser cladding manufacturing method of seamless steel pipe piercing plugs, describing a method of cladding tungsten carbide on the surface of a substrate by using 15CrMo as the substrate, achieving the purpose of reducing the manufacturing cost of the piercing plug. However, the dilution effect of the matrix on the cladding powder is not considered, the service life of the piercing point is not improved, and the problem of high wear rate of the piercing point cannot be solved at present.
In summary, the conventional piercing plug production technology cannot achieve significant improvement in terms of improving the service cycle and reducing the wear rate, and therefore a method capable of greatly improving the service cycle and improving the performance of the piercing plug is urgently needed.
Disclosure of Invention
The invention aims to provide a method for manufacturing a seamless steel pipe piercing plug through laser additive manufacturing, which can greatly improve the service cycle of the piercing plug and improve the performance of the piercing plug.
The technical scheme for realizing the purpose is as follows: the method for manufacturing the seamless steel pipe piercing plug through the laser additive is characterized by comprising the following steps of:
s1, polishing the surface of the base body of the steel pipe piercing plug, and reserving the thickness of a working layer required by laser material increase;
s2, cleaning the surface of the substrate to remove oil stains;
s3, laser-adding a CoCrW alloy layer on the surface of the substrate, wherein the CoCrW alloy layer comprises the following chemical components in percentage by weight: 1.5 to 3.0% of carbon, 0.5 to 2.5% of silicon, 27.0 to 33.0% of chromium, 0 to 4.5% of iron, 1.0 to 3.0% of nickel, 10.0 to 15.0% of tungsten, 0.5 to 2.2% of molybdenum, 0.2 to 0.7% of manganese, 0.1 to 0.2% of vanadium, and the balance of cobalt and inevitable impurities.
Compared with the prior art, the CoCrW alloy of the invention increases the contents of chromium and tungsten, and simultaneously increases vanadium, thereby effectively improving the heat resistance, hardness and heat strength of the coating.
The invention ensures that the hardness of the piercing plug reaches 600HV, the friction coefficient at high temperature (500 ℃) is only 0.18, compared with the plug without additive, the service life of the piercing plug is prolonged to 500 from 100, which is improved by 5 times, the improvement is more obvious, and the additive technology is used, so the production cost is lower.
Further, after step S2, the base body is subjected to flaw detection to ensure that the base body entering the material adding process has no air holes or crack defects.
Further, after step S3, the post-additive substrate is inspected for flaws, and the machined portion is required to have no cracks or air hole defects.
Further, in step S1, H13 steel was used as the base of the piercing plug.
Furthermore, in the step S3, the number of additive layers is 4-7.
According to the invention, the CoCrW alloy layer is added to the H13 matrix layer by layer, so that the dilution effect of the matrix on the additive alloy layer is reduced, the performance of the piercing point reaches the strength of the cobalt-based alloy, and compared with the traditional piercing point, the hardness, the high-temperature wear resistance and the corrosion resistance are obviously improved.
The additive layer number is controlled to be 4-7, because the base material has a diluting effect on the additive powder and reduces the performance of the coating, and when the additive layer number reaches 3 layers, the diluting effect is greatly reduced, and the reduction is not obvious after 7 layers, so that the control of the additive layer number to be 4-7 layers has important significance on the performance of the coating.
Furthermore, in the step S3, the thickness of each additive layer is 200 to 500 μm, and the total thickness of the additive CoCrW alloy layer is 2 to 3 mm.
Further, in step S3, the YAG solid laser is used to laser dope the surface of the substrate, and the operating parameters of the YAG solid laser are as follows: the wavelength is 1064nm, the maximum laser power is 2000W, and the diameter of a light spot is 2.0-2.5 mm.
Further, argon is used for protecting the molten pool during the laser material increasing process in the step S3.
Furthermore, the granularity of alloy powder adopted by the CoCrW alloy powder layer is 200-280 mu m, the cost is too high when the powder is too fine, and the quality of a coating is affected when the powder is too coarse, so that the granularity is most reasonable from 200 to 280 mu m.
Increased coating thickness generally reduces the bond strength and reduces the useful life of the coating, but the coating is too thin, has good bond strength and poor wear resistance. Compared with the prior art, the invention has the main difference that trace elements are added in the formula, the coating with proper thickness is prepared, the wear resistance of the coating is improved, and the service life of the coating is prolonged.
Detailed Description
First embodiment
The invention discloses a method for manufacturing a seamless steel pipe piercing plug by laser additive manufacturing, which specifically comprises the following steps:
s1, adopting H13 steel as a base body of the piercing plug, firstly, grinding the surface of the base body by using a grinding machine, and reserving the thickness of the additive layer of 2 mm.
And S2, cleaning the polished H13 steel surface by using alcohol to remove oil stains.
And S3, detecting the surface of the ground and cleaned substrate by using a dye penetrant inspection method, wherein the ground and cleaned substrate has no defects such as cracks and pores, and the like, so that the additive can be uniformly clad.
S4, adopting an RH-700 type YAG solid laser to perform laser additive CoCrW alloy powder layer on the surface of the substrate, wherein the CoCrW alloy powder layer comprises the following chemical components in percentage by weight: 1.5% of carbon, 2.5% of silicon, 27.0% of chromium, 4.5% of iron, 1.0% of nickel, 15.0% of tungsten, 0.5% of molybdenum, 0.7% of manganese, 0.1% of vanadium, and the balance of cobalt and inevitable impurities.
The CoCrW alloy powder layer adopts alloy powder with the granularity of 200 mu m, the additive layer number is 4, the average thickness of each additive layer is 520 mu m, and the total thickness of the additive CoCrW alloy layer is 2.08 mm.
Operating parameters of the YAG solid laser: the wavelength of the laser is 1064nm, the laser power is 2000W, the diameter of a light spot is 2mm, and in the material increase process, argon is adopted to protect a molten pool and prevent the molten pool from being oxidized.
And S5, carrying out flaw detection on the matrix after the material is added, wherein the CoCrW alloy powder layer is required to have no defects such as cracks, pores and the like.
The service life of the piercing point manufactured by the embodiment can reach 4 times of that of an original H13 piercing point, 100 steel pipes are promoted to 400 steel pipes through continuous production, the service life is greatly prolonged, the wear resistance test of a high-temperature friction wear testing machine is carried out, the friction coefficient at high temperature (500 ℃) reaches 0.20, the microhardness is 680HV, and through metallographic observation, the total thickness of an additive layer is 2.08mm, which is 2 times of the cladding thickness of the piercing point manufactured in the laser cladding manufacturing method of the seamless steel pipe piercing point disclosed in the background art.
Second embodiment
The invention discloses a method for manufacturing a seamless steel pipe piercing plug by laser additive manufacturing, which specifically comprises the following steps:
s1, adopting H13 steel as a base body of the piercing plug, firstly, grinding the surface of the base body by using a grinding machine, and reserving the thickness of the additive layer of 3 mm.
And S2, cleaning the polished H13 steel surface by using alcohol to remove oil stains.
And S3, detecting the surface of the ground and cleaned substrate by using a dye penetrant inspection method, wherein the ground and cleaned substrate has no defects such as cracks and pores, and the like, so that the additive can be uniformly clad.
S4, adopting an RH-700 type YAG solid laser to perform laser additive CoCrW alloy powder layer on the surface of the substrate, wherein the CoCrW alloy powder layer comprises the following chemical components in percentage by weight: 3.0% of carbon, 0.5% of silicon, 33.0% of chromium, 3.0% of nickel, 10.0% of tungsten, 2.2% of molybdenum, 0.2% of manganese, 0.2% of vanadium, and the balance of cobalt and inevitable impurities.
The CoCrW alloy powder layer adopts alloy powder with the granularity of 280 mu m, the additive layer number is 6, the additive thickness of each layer is 500 mu m, and the total thickness of the additive CoCrW alloy layer is 3 mm.
Operating parameters of the YAG solid laser: the wavelength of the laser is 1064nm, the laser power is 2000W, the diameter of a light spot is 2.5mm, and in the material increase process, argon is adopted to protect a molten pool and prevent the molten pool from being oxidized.
And S5, carrying out flaw detection on the matrix after the material is added, wherein the CoCrW alloy powder layer is required to have no defects such as cracks, pores and the like.
The service life of the piercing point manufactured by the embodiment can reach 5 times of that of the original H13 piercing point, 100 steel pipes are continuously produced and are promoted to 500 steel pipes, the wear resistance test of a high-temperature friction wear testing machine shows that the friction coefficient at high temperature (500 ℃) reaches 0.18, the microhardness is 699HV, the piercing point is equivalent to the piercing point manufactured by the laser cladding manufacturing method of the seamless steel pipe piercing point disclosed in the background technology, the total thickness of the additive layer is 3mm, which is 3 times of that of a comparison file, and the reason why the service life of the piercing point manufactured by the invention is longer is also shown.
Claims (9)
1. The method for manufacturing the seamless steel pipe piercing plug through the laser additive is characterized by comprising the following steps of:
s1, polishing the surface of the base body of the steel pipe piercing plug, and reserving the thickness of a working layer required by laser material increase;
s2, cleaning the surface of the substrate to remove oil stains;
s3, performing laser additive on the CoCrW alloy powder layer on the surface of the substrate, wherein the CoCrW alloy powder layer comprises the following chemical components in percentage by weight: 1.5 to 3.0% of carbon, 0.5 to 2.5% of silicon, 27.0 to 33.0% of chromium, 0 to 4.5% of iron, 1.0 to 3.0% of nickel, 10.0 to 15.0% of tungsten, 0.5 to 2.2% of molybdenum, 0.2 to 0.7% of manganese, 0.1 to 0.2% of vanadium, and the balance of cobalt and inevitable impurities.
2. The method for laser additive manufacturing of the seamless steel pipe piercing plug according to claim 1, characterized in that: and after the step S2, carrying out flaw detection on the substrate to ensure that the substrate entering the material increase process has no air holes or crack defects.
3. The method for laser additive manufacturing of the seamless steel pipe piercing plug according to claim 1, characterized in that: after step S3, the added substrate is subjected to flaw detection, and the added CoCrW alloy powder layer is required to have no cracks or air hole defects.
4. The method for laser additive manufacturing of the seamless steel pipe piercing plug according to claim 1, characterized in that: in step S1, H13 steel was used as the base of the steel pipe piercing plug.
5. The method for laser additive manufacturing of the seamless steel pipe piercing plug according to claim 1, characterized in that: in the step S3, the number of additive layers is 4-7.
6. The method for laser additive manufacturing of the seamless steel pipe piercing plug according to claim 5, wherein: in the step S3, the thickness of each additive layer is 200-500 μm, and the total thickness of the additive CoCrW alloy layer is 2-3 mm.
7. The method for laser additive manufacturing of the seamless steel pipe piercing plug according to claim 1, characterized in that: in the step S3, a YAG solid laser is adopted to carry out laser material increase on the surface of the substrate, and the working parameters of the YAG solid laser are as follows: the wavelength is 1064nm, the maximum laser power is 2000W, and the diameter of a light spot is 2.0-2.5 mm.
8. The method for laser additive manufacturing of the seamless steel pipe piercing plug according to claim 1, characterized in that: and in the step S3, argon is used for protecting the molten pool in the laser material increasing process.
9. The method for laser additive manufacturing of the seamless steel pipe piercing plug according to claim 1, characterized in that: the granularity of alloy powder adopted by the CoCrW alloy powder layer is 200-280 mu m.
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| CN202111609005.0A CN114273674B (en) | 2021-12-27 | 2021-12-27 | Method for manufacturing seamless steel pipe piercing plug through laser additive |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101519778A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Laser cladding method for strengthening surface of piercing point |
| CN103290410A (en) * | 2013-07-03 | 2013-09-11 | 辽宁思达思克实业有限公司 | Laser cladding manufacturing method of seamless steel tube piercing plug |
| CN103498148A (en) * | 2013-09-05 | 2014-01-08 | 江苏翌煜能源科技发展有限公司 | Laser cladding method for surface of piercing plug |
| CN110205561A (en) * | 2019-06-20 | 2019-09-06 | 芜湖点金机电科技有限公司 | A kind of reinforcing piercing plug for seamless steel tubes and preparation method thereof |
| CN110747384A (en) * | 2019-11-21 | 2020-02-04 | 江苏威拉里新材料科技有限公司 | Cobalt-based metal powder |
| CN110952090A (en) * | 2019-12-24 | 2020-04-03 | 芜湖点金机电科技有限公司 | Piercing plug made of metal-based composite material |
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2021
- 2021-12-27 CN CN202111609005.0A patent/CN114273674B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101519778A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Laser cladding method for strengthening surface of piercing point |
| CN103290410A (en) * | 2013-07-03 | 2013-09-11 | 辽宁思达思克实业有限公司 | Laser cladding manufacturing method of seamless steel tube piercing plug |
| CN103498148A (en) * | 2013-09-05 | 2014-01-08 | 江苏翌煜能源科技发展有限公司 | Laser cladding method for surface of piercing plug |
| CN110205561A (en) * | 2019-06-20 | 2019-09-06 | 芜湖点金机电科技有限公司 | A kind of reinforcing piercing plug for seamless steel tubes and preparation method thereof |
| CN110747384A (en) * | 2019-11-21 | 2020-02-04 | 江苏威拉里新材料科技有限公司 | Cobalt-based metal powder |
| CN110952090A (en) * | 2019-12-24 | 2020-04-03 | 芜湖点金机电科技有限公司 | Piercing plug made of metal-based composite material |
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