CN102534604B - Method for prolonging service life of piercing plug for seamless steel tubes - Google Patents
Method for prolonging service life of piercing plug for seamless steel tubes Download PDFInfo
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- CN102534604B CN102534604B CN201210028400.4A CN201210028400A CN102534604B CN 102534604 B CN102534604 B CN 102534604B CN 201210028400 A CN201210028400 A CN 201210028400A CN 102534604 B CN102534604 B CN 102534604B
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- chromium carbide
- piercing plug
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Abstract
The invention relates to the technical field of seamless steel tube production, in particular to a method for prolonging the service life of a piercing plug for seamless steel tubes. Applying a high-energy micro-arc alloying into the technique for preparing coating on the surface of the piercing plug, the method comprises: firstly, preparing a metal yttrium modified chrome carbide electrode by a hot pressing sintering process; secondly, depositing a chrome carbide coating on the piercing plug by using high-energy micro-arc alloying equipment, controlling the argon flow and the output voltage, frequency, power and deposition time of the equipment in a coating preparation process, and thus, preparing the high-performance coating on the surface of the piercing plug and prolonging the service life of the piercing plug.
Description
Technical field
The present invention relates to seamless steel tube production technical field, refer in particular to a kind of piercing plug for seamless steel tubes method in work-ing life that improves, adopt the means of high energy differential of the arc alloying in the CrC coating of conventional perforating head surface preparation Rare Earth Y, thereby use top to improve more than 55% work-ing life, and effectively saved cost.
Background technology
Perforating head is one of key tool of consumption maximum in seamless steel tube production, and the height in its work-ing life all has a direct impact the Yield and quality of tube product, production cost, and extremely Steel Pipe Enterprise shows great attention to.Because top contacts with high temperature pipe in perforation procedure, bearing the effect of the compound stresses such as huge axial compression stress, radial cut stress and skin friction force, therefore easily just collapse the inefficacies such as nose, steel bonding, cracking in early days, cause its work-ing life not high, thereby affect the production efficiency of Steel Pipe Enterprise, increase the production cost of enterprise simultaneously.At present a large amount of researchists have carried out systematic study to perforating head, come directly towards hot strength and the hardness of material by improvement, improve surperficial antioxidant property, just can effectively prevent from coming directly towards collapse nose, steel bonding, cracking, thereby improve the work-ing life of top.Large quantity research shows by the surface treatments such as surface coating, boronising, built-up welding are carried out in top, this process for treating surface is not only economical and practical but also can effectively improve top work-ing life, but due to the complicacy effect of the excessive layer between coating and matrix, thereby make this process for treating surface be difficult to apply on a large scale.The present invention is summing up on the basis of large quantity research, a kind of new process of surface treatment is proposed, by adopting the means of high energy differential of the arc alloying in the CrC coating of conventional perforating head surface preparation Rare Earth Y, thereby use top to improve more than 55% work-ing life, and effectively saved cost.
Summary of the invention
The invention provides a kind of a kind of sufacing method of preparing new coating on perforating head surface, high energy differential of the arc alloying process is incorporated in the technology of preparing of perforating head top coat, first adopt hot pressing sintering method to make the chromium carbide electrode of rare earth metal yttrium modification, then under argon shield, adopt high energy differential of the arc alloying equipment on perforating head, to deposit chromium carbide coating, control argon flow amount and equipment output voltage in coating preparation process, frequency, power and depositing time, thereby realize on surface, top, prepare excellent performance to coating, improve the work-ing life of perforating head.
Processing method of the present invention mainly comprises following step, and concrete steps are as follows:
Step 1: prepare coated electrode: the present invention adopts chromium carbide semi-sintered electrode, the preparation method of chromium carbide semi-sintered electrode is as follows: first select high pure and ultra-fine chromium carbide powder to make raw material, using NiCr and Mo as matrix metal phase, and add nano level Y to make additive, each component is as follows by mass percentage:
High pure and ultra-fine chromium carbide powder 72% ~ 75%;
The mixture 24% ~ 27% of NiCr and Mo, wherein Mo accounts for 0.5% ~ 1% of mixture quality;
Nano level Y
2o
30.5% ~ 2%.
Compound is through wet ball-milling, vacuum-drying, N
2in air-flow, sieve, press forming under 5MPa high pressure, air-dry after, at 1300 ℃ of temperature sintering, insulation 10h obtain.
Step 2: the preparation of perforating head top coat, on piercing plug for seamless steel tubes surface, adopt high energy differential of the arc alloying equipment deposition chromium carbide coating: the chromium carbide semi-sintered electrode that optional step 1 prepares is as the consumable electrode of anode, conditioning equipment output rating 500-3000W, voltage 40-150V, frequency 300-2000Hz, the controlled 10-60ml/s of flow of the protectiveness argon gas of selecting during deposition, for preventing that coating and matrix from bonding together, the consumable electrode rotation of spinning, rotating speed is at 30-400 revolutions per second, control depositing time 3-10 minute, realization reaches 10-30um to the coat-thickness in the preparation of surface, top.
In described step 1, chromium carbide powder is Cr
3c
2, Cr
7c
3, Cr
23c
6or by Cr
3c
2, Cr
7c
3and Cr
23c
6by any mass ratio, mix, in chromium carbide powder, foreign matter content should be less than 0.01wt%, and particle diameter is less than 200 nanometers.
In described step 1, the chemical composition of NiCr alloy is 79wt%Ni-21wt%Cr.
Nano level Y in described step 1
2o
3particle diameter be less than 200 nanometers.
In described step 2; the varying parameter of this equipment is output rating, voltage and frequency; the spin rotating speed of depositing electrode; the flow of shielding gas during deposited coatings; can regulation output power and magnitude of voltage according to the combination of power shelves; and electrode rotating speed and shield gas flow rate and the depositing time of matched with it, finally reach certain thickness coating.
Beneficial effect of the present invention is that perforating head, when deposited coatings, does not need oil removal treatment, and after being disposed by above-mentioned steps, perforating head surface can deposit one deck CrC coating, and coat-thickness is in 10-30 μ m scope; Coating is metallurgical binding with surface, top, sticking power is greater than 130N, and there is higher surface hardness and be greater than 2500Hv, prepared chromium carbide coating has good wear resisting property and antioxidant property, coating is greater than 130N with top surface adhesion force, coatingsurface hardness is greater than 2500Hv, the perforating head preparing can be realized 1500, once perforated weldless steel tube, than improving 55% the work-ing life of original steel pipe, the process of surface treatment of this perforating head does not pollute environment, technical process is simple, easily controls.
Embodiment
embodiment 1:
1) prepare coated electrode: select and using NiCr alloy powder and Mo as matrix metal phase, chromium carbide powder is by 30
%cr
3c
2, 30
%cr
7c
3with 40
%cr
23c
6form the mixture 25% of NiCr alloy powder and metal M o powder; Wherein metal M o powder accounts for 0.5% of mixture quality; Nanometer Y
2o
31%; Chromium carbide powder 74%, mixes each component by wet ball-milling vacuum-drying, N
2in air-flow, sieve, press forming under 5MPa high pressure is put into sintering at 1300 ℃ of temperature, after insulation 10h, makes chromium carbide electrode, and the particle size range of described chromium carbide powder is at 170 ~ 190nm; Described nanometer Y
2o
3particle size range at 150 ~ 180nm.
2) preparation of perforating head top coat: be chosen in piercing plug for seamless steel tubes 16Cr2Ni4MoW material surface and adopt high energy differential of the arc alloying equipment deposition chromium carbide coating, the chromium carbide semi-sintered electrode that optional step 1 prepares is as the consumable electrode of anode, conditioning equipment output rating 2000W, voltage 110V, frequency 1300Hz, the flow 55ml/s of protectiveness argon gas during deposition, depositing electrode can spin rotational speed at 400 revolutions per seconds, depositing time 3 minutes, the coat-thickness of surface, top preparation is 21um, sticking power 140N, hardness is 2610Hv, the perforating head preparing can be realized 1507, once perforated weldless steel tube, than original perforation, improve more than 55% 967 work-ing lifes.
embodiment 2:
1) prepare coated electrode: select and using NiCr alloy powder and Mo as matrix metal phase, chromium carbide powder is Cr
3c
2, the mixture 26% of NiCr alloy powder and metal M o powder; Wherein metal M o powder accounts for 1% of mixture quality; Nanometer Y
2o
32%; Chromium carbide powder 72%, mixes each component by wet ball-milling vacuum-drying, N
2in air-flow, sieve, press forming under 5MPa high pressure is put into sintering at 1300 ℃ of temperature, after insulation 10h, makes chromium carbide electrode, and the particle size range of described chromium carbide powder is at 180 ~ 200nm; Described nanometer Y
2o
3particle size range at 180 ~ 200nm.
2) preparation of perforating head top coat: be chosen in piercing plug for seamless steel tubes 15Cr2Ni3MoW material surface and adopt high energy differential of the arc alloying equipment deposition chromium carbide coating, the chromium carbide semi-sintered electrode that optional step 1 prepares is as the consumable electrode of anode, conditioning equipment output rating 1500W, voltage 90V, frequency 1200Hz, the flow 45ml/s of protectiveness argon gas during deposition, depositing electrode can spin rotational speed at 230 revolutions per seconds, depositing time 4 minutes, the coat-thickness of surface, top preparation is 18um, sticking power 135N, hardness is 2570Hv, the perforating head preparing can be realized 1500, once perforated weldless steel tube, than original perforation, improve more than 55% 967 work-ing lifes.
embodiment 3:
1) prepare coated electrode: select and using NiCr alloy powder and Mo as matrix metal phase, chromium carbide powder is Cr
7c
3, the mixture 24.5% of NiCr alloy powder and metal M o powder; Wherein metal M o powder accounts for 1% of mixture quality; Nanometer Y
2o
30.5%; Chromium carbide powder 75%, mixes each component by wet ball-milling vacuum-drying, N
2in air-flow, sieve, press forming under 5MPa high pressure is put into sintering at 1300 ℃ of temperature, after insulation 10h, makes chromium carbide electrode, and the particle size range of described chromium carbide powder is at 160 ~ 180nm; Described nanometer Y
2o
3particle size range at 180 ~ 200nm.
2) preparation of perforating head top coat: be chosen in piercing plug for seamless steel tubes 15Cr2Ni3MoW material surface and adopt high energy differential of the arc alloying equipment deposition chromium carbide coating, the chromium carbide semi-sintered electrode that optional step 1 prepares is as the consumable electrode of anode, conditioning equipment output rating 500W, voltage 130V, frequency 300Hz, the flow 25ml/s of protectiveness argon gas during deposition, depositing electrode can spin rotational speed at 100 revolutions per seconds, depositing time 8 minutes, the coat-thickness of surface, top preparation is 15um, sticking power 136N, hardness is 2590Hv, the perforating head preparing can be realized 1501, once perforated weldless steel tube, than original perforation, improve more than 55% 967 work-ing lifes.
embodiment 4:
1) prepare coated electrode: select and using NiCr alloy powder and Mo as matrix metal phase, chromium carbide powder is Cr
23c
6, the mixture 27% of NiCr alloy powder and metal M o powder; Wherein metal M o powder accounts for 0.5% of mixture quality; Nanometer Y
2o
31%; Chromium carbide powder 72%, mixes each component by wet ball-milling vacuum-drying, N
2in air-flow, sieve, press forming under 5MPa high pressure is put into sintering at 1300 ℃ of temperature, after insulation 10h, makes chromium carbide electrode, and the particle size range of described chromium carbide powder is at 160 ~ 180nm; Described nanometer Y
2o
3particle size range at 180 ~ 200nm.
2) preparation of perforating head top coat: be chosen in piercing plug for seamless steel tubes 15Cr2Ni3MoW material surface and adopt high energy differential of the arc alloying equipment deposition chromium carbide coating, the chromium carbide semi-sintered electrode that optional step 1 prepares is as the consumable electrode of anode, conditioning equipment output rating 1000W, voltage 40V, frequency 1800Hz, the flow 15ml/s of protectiveness argon gas during deposition, depositing electrode can spin rotational speed at 50 revolutions per seconds, depositing time 10 minutes, the coat-thickness of surface, top preparation is 25um, sticking power 132N, hardness is 2600Hv, the perforating head preparing can be realized 1506, once perforated weldless steel tube, than original perforation, improve more than 55% 967 work-ing lifes.
embodiment 5:
1) prepare coated electrode: select and using NiCr alloy powder and Mo as matrix metal phase, chromium carbide powder is by 10
%cr
3c
2, 50
%cr
7c
3with 40
%cr
23c
6form the mixture 27% of NiCr alloy powder and metal M o powder; Wherein metal M o powder accounts for 0.5% of mixture quality; Nanometer Y
2o
31%; Chromium carbide powder 72%, mixes each component by wet ball-milling vacuum-drying, N
2in air-flow, sieve, press forming under 5MPa high pressure is put into sintering at 1300 ℃ of temperature, after insulation 10h, makes chromium carbide electrode, and the particle size range of described chromium carbide powder is at 160 ~ 180nm; Described nanometer Y
2o
3particle size range at 180 ~ 200nm.
2) preparation of perforating head top coat: be chosen in piercing plug for seamless steel tubes 15Cr2Ni3MoW material surface and adopt high energy differential of the arc alloying equipment deposition chromium carbide coating, the chromium carbide semi-sintered electrode that optional step 1 prepares is as the consumable electrode of anode, conditioning equipment output rating 3000W, voltage 150V, frequency 2000Hz, the flow 10ml/s of protectiveness argon gas during deposition, depositing electrode can spin rotational speed at 30 revolutions per seconds, depositing time 3 minutes, the coat-thickness of surface, top preparation is 28um, sticking power 138N, hardness is 2650Hv, the perforating head preparing can be realized 1510, once perforated weldless steel tube, than original perforation, improve more than 55% 967 work-ing lifes.
Claims (4)
1. one kind is improved the piercing plug for seamless steel tubes method in work-ing life, it is characterized in that: first adopt hot pressing sintering method to make the chromium carbide electrode of rare earth metal yttrium modification, then under argon shield, adopt high energy differential of the arc alloying equipment, argon flow amount and equipment output voltage, frequency, power and the depositing time controlled in coating preparation process deposit chromium carbide coating on perforating head, thereby improve the work-ing life of perforating head; Concrete steps are as follows:
Step 1: prepare coated electrode: adopt chromium carbide semi-sintered electrode, the preparation method of chromium carbide semi-sintered electrode is as follows: first select high pure and ultra-fine chromium carbide powder to make raw material, using NiCr and Mo as matrix metal phase, and add nano level Y to make additive, each component is as follows by mass percentage:
High pure and ultra-fine chromium carbide powder 72% ~ 75%;
The mixture 24% ~ 27% of NiCr and Mo, wherein Mo accounts for 0.5% ~ 1% of mixture quality;
Nano level Y
2o
30.5% ~ 2%;
Compound is through wet ball-milling, vacuum-drying, N
2in air-flow, sieve, press forming under 5MPa high pressure, air-dry after, at 1300 ℃ of temperature sintering, insulation 10h obtain;
Step 2: the preparation of perforating head top coat, on piercing plug for seamless steel tubes surface, adopt high energy differential of the arc alloying equipment deposition chromium carbide coating: the chromium carbide semi-sintered electrode that optional step 1 prepares is as the consumable electrode of anode, conditioning equipment output rating 500-3000W, voltage 40-150V, frequency 300-2000Hz, the controlled 10-60ml/s of flow of the protectiveness argon gas of selecting during deposition, for preventing that coating and matrix from bonding together, the consumable electrode rotation of spinning, rotating speed is at 30-400 revolutions per second, control depositing time 3-10 minute, realization reaches 10-30um to the coat-thickness in the preparation of surface, top.
2. a kind of piercing plug for seamless steel tubes method in work-ing life that improves as claimed in claim 1, is characterized in that: in described step 1, chromium carbide powder is Cr
3c
2, Cr
7c
3, Cr
23c
6or by Cr
3c
2, Cr
7c
3and Cr
23c
6by any mass ratio, mix, in chromium carbide powder, foreign matter content is less than 0.01wt%, and particle diameter is less than 200 nanometers.
3. a kind of piercing plug for seamless steel tubes method in work-ing life that improves as claimed in claim 1, is characterized in that: in described step 1, the chemical composition of NiCr alloy is 79wt%Ni-21wt%Cr.
4. a kind of piercing plug for seamless steel tubes method in work-ing life that improves as claimed in claim 1, is characterized in that: nano level Y in described step 1
2o
3particle diameter be less than 200 nanometers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210028400.4A CN102534604B (en) | 2012-02-09 | 2012-02-09 | Method for prolonging service life of piercing plug for seamless steel tubes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210028400.4A CN102534604B (en) | 2012-02-09 | 2012-02-09 | Method for prolonging service life of piercing plug for seamless steel tubes |
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| CN102534604A CN102534604A (en) | 2012-07-04 |
| CN102534604B true CN102534604B (en) | 2014-04-09 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195549B (en) * | 2014-09-15 | 2017-04-12 | 包头北方创业股份有限公司 | Method for reinforcing tooth surface of driving wheel gear ring of crawler vehicle |
| CN106148970A (en) * | 2015-04-16 | 2016-11-23 | 宁波金特信钢铁科技有限公司 | A kind of piercing plug for seamless steel tubes surface infiltration layer technique |
| CN105821459B (en) * | 2016-03-29 | 2018-06-26 | 常州大学 | A kind of method for preparing boride coating in stainless steel surface |
| CN109023355B (en) * | 2018-09-30 | 2020-05-01 | 安徽工业大学 | Multi-scale particle reinforced plasma surfacing iron-based hypereutectic wear-resistant coating and preparation method thereof |
| CN110205561B (en) * | 2019-06-20 | 2021-02-12 | 芜湖点金机电科技有限公司 | Reinforced seamless steel pipe piercing plug and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4393677A (en) * | 1979-12-25 | 1983-07-19 | Nippon Kokan Kabushiki Kaisha | Plugs for use in piercing and elongating mills |
| CN101195126A (en) * | 2007-12-26 | 2008-06-11 | 华北电力大学 | Ceramic-metallic composite cladding layer top head for tube inserting machine and method for producing the same |
| CN101848777A (en) * | 2007-11-01 | 2010-09-29 | 住友金属工业株式会社 | Piercing plug, method for regenerating piercing plug, and regeneration facility line for piercing plug |
| CN101994077A (en) * | 2010-10-27 | 2011-03-30 | 江苏科技大学 | High-temperature oxidation resisting intermetallic compound coating and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3228169B2 (en) * | 1997-03-07 | 2001-11-12 | 住友金属工業株式会社 | Plug for piercing and rolling of seamless metal pipe and method of manufacturing seamless metal pipe using this plug |
-
2012
- 2012-02-09 CN CN201210028400.4A patent/CN102534604B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4393677A (en) * | 1979-12-25 | 1983-07-19 | Nippon Kokan Kabushiki Kaisha | Plugs for use in piercing and elongating mills |
| CN101848777A (en) * | 2007-11-01 | 2010-09-29 | 住友金属工业株式会社 | Piercing plug, method for regenerating piercing plug, and regeneration facility line for piercing plug |
| CN101195126A (en) * | 2007-12-26 | 2008-06-11 | 华北电力大学 | Ceramic-metallic composite cladding layer top head for tube inserting machine and method for producing the same |
| CN101994077A (en) * | 2010-10-27 | 2011-03-30 | 江苏科技大学 | High-temperature oxidation resisting intermetallic compound coating and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 无缝钢管穿孔顶头失效形式分析及提高使用寿命的研究进展;王斌 等;《材料导报》;20060630;第20卷(第6期);第82-84页 * |
| 王斌 等.无缝钢管穿孔顶头失效形式分析及提高使用寿命的研究进展.《材料导报》.2006,第20卷(第6期),第82-84页. |
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