CN106148818A - The manufacture method of a kind of piercing plug for seamless steel tubes and temperature control system thereof - Google Patents
The manufacture method of a kind of piercing plug for seamless steel tubes and temperature control system thereof Download PDFInfo
- Publication number
- CN106148818A CN106148818A CN201610463146.9A CN201610463146A CN106148818A CN 106148818 A CN106148818 A CN 106148818A CN 201610463146 A CN201610463146 A CN 201610463146A CN 106148818 A CN106148818 A CN 106148818A
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- Prior art keywords
- temperature
- forging
- manufacture method
- seamless steel
- steel tubes
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Classifications
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
-
- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/34—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in more than one step
Abstract
The present invention provides manufacture method and the temperature control system thereof of a kind of piercing plug for seamless steel tubes, comprises the steps: step 1, pre-forging, by Heating Steel Ingots to 150～200 DEG C, it is forged 5 minutes；Step 2, after pre-forging, steel ingot temperature is heated to lower than its overtemperature 20～40 DEG C；Step 3, the round steel obtained are incubated in the environment of lower than its overtemperature 100 DEG C, make blank by die forging；Mould is utilized to make blank deformation obtain forging；Step 4, to blank 680 DEG C insulation within 8 hours, cool to 300 DEG C with the furnace after air cooling.Step 5, the product obtaining step 4 carry out nitrogen treatment at 950 DEG C.Described steel ingot chemical analysis is the 20CrNi4 material that with the addition of zinc.The present invention can make perforating head while can meeting the necessary rigidity of perforation, also have good can forgeability, density and the intensity of product are higher, and wearability is more preferable, extends the service life of product.
Description
Technical field
The present invention relates to the manufacture method of perforating head, especially a kind of high-alloy seamless steel pipe rolling high-strength abrasion-proof
The manufacture method of top, belongs to equipment manufacturing technical field.
Background technology
Top is the quality of the key tool quality in seamless steel tube production, and the length in service life directly affects steel pipe
The Yield and quality produced and the economic benefit of enterprise.Solid pipe billet, during piercing seamless steel pipe, is made hollow hair by top
Pipe, the deformation of metal is mainly carried out on top.The working condition of perforating head is quite severe, not only to bear powerful axial
Pressure, and to overcome the powerful deformation friction produced between inwall.Thus it is believed that perforating head is tired in low week
Work under the conditions of labor, thus the main cause being to affect service life is scrapped in its abrasion.
There is following defect in prior art: first, and the 20CrNi4 material that steel ingot uses, this material can not meet longevity
Life and the needs of high intensity.Secondly, the temperature in the manufacture process of perforating head and the link such as forging time and nitrogen treatment
All the quality of final products is played large effect.Particularly in terms of forging time and heating-up temperature.Before the applicant
The patent application CN201410436166.8 proposed provides the manufacture method of a kind of perforating head.Prepared by employing the method wears
Top, hole density is high, and intensity and wearability are high, and quality quite stable during perforation is also significantly improved service life, it is adaptable to
The rolling of compo pipe, higher than the cost performance using H13 or full molybdenum plug, cost is the 1/3 of H13 product, is full molybdenum product
1/10.And the most the heating means of steel ingot and forging temperature and time are not carried out clearly, can not be accurate
Control the quality of forging.Li Zhiguang et al. is in the determination of heat time heating time " steel forging " (metal casting forge welding techniques, in July, 2010)
One literary composition proposes a kind of forging and determines method heat time heating time, and the method does not determine heating-up temperature and forging time
Relation.3rd, in nitridation and oxidizing process, use nitrogen ethanol too much, while waste resource, also bring the increase of cost.
Summary of the invention
For solving above-mentioned technical problem, the technical scheme that the present invention provides is as follows: the system of a kind of piercing plug for seamless steel tubes
Make method, comprise the steps: step 1, pre-forging, by Heating Steel Ingots to 150～200 DEG C, it is forged 5 minutes；Step
Rapid 2, after pre-forging, steel ingot temperature is heated to lower than its overtemperature 20～40 DEG C；Step 3, the round steel obtained are incubated
In the environment of lower than its overtemperature 100 DEG C, make blank by die forging；Mould is utilized to make blank deformation obtain forging；
Step 4, to blank 680 DEG C insulation within 8 hours, cool to 300 DEG C with the furnace after air cooling.Step 5, the product obtaining step 4 are 950
DEG C carry out nitrogen treatment.
Described steel ingot chemical analysis is: carbon C:0.10～0.17, silicon Si:0.17～0.37, zinc Zn:0.05-0.1, manganese Mn:
0.30～0.60, sulfur S: allow residual content≤0.035, phosphorus P: allow residual content≤0.03, chromium Cr:0.60～0.90, nickel
Ni:2.75～3.15, copper Cu: allowing residual content≤0.030, remaining is ferrum Fe.
In described step 3 there is following relation in forging time and temperature: setting Y as steel ingot temperature, x is forging time, then Y
(x)=407*(log(x))2/(1+x2)。
Adding ethanol during nitrogen treatment, 1100 DEG C carry out oxidation processes.After gas carbruizing furance furnace temperature is raised to 950 DEG C, past
Ethanol and nitrogen it is passed through in burner hearth, and after keeping 25-28 minute, then the oxidation basket installing top is loaded in stove, seal stove
Door, makes stove heat up, and continues to be passed through the ethanol of 70 droplets/point in burner hearth and 115ml/ divides nitrogen, until furnace temperature rises to 1100 DEG C.
Again toward being passed through the water of 120 droplets/point in burner hearth, after keeping 100 minutes, then the intake reducing water is protected to 80 droplets/point, regulation stove
Temperature temperature is to 900 DEG C, 890 DEG C, 880 DEG C, 870 DEG C, 860 DEG C, and each temperature section stopped after 10 minutes, closes stove heating
System, stops being passed through of water, and adjustment ethanol intake is to 90 droplets/point, until furnace temperature drops to 800 DEG C, oxidizing process completes, then
Closing stove heating system, stop being passed through of water, adjustment ethanol intake is to 90 droplets/point, until furnace temperature drops to 800 DEG C, and oxidation
Process completes.
The invention allows for a kind of temperature control system, including an actuator, actuator connects three-dimensional SCR regulation mould
Block, described three-dimensional SCR adjustment module is connected with electrical heating module, for controlling the voltage of electrical heating module, electrical heating module chain
Connecing inside of boiler, heat inside of boiler, temperature transmitter connects inside of boiler and it is carried out temperature detection, temperature is believed
Number feed back to connected actuator.
Technical scheme has the advantage that steel ingot uses the 20CrNi4 material improved, owing to adding zinc unit
Element, make perforating head while can meeting the necessary rigidity of perforation, also have good can forgeability.Have employed temperature
Degree control system controls the temperature of heating steel ingot, it is taken out from boiler when being heated to predetermined temperature and forges, in forging
Monitor the temperature of steel ingot during making, and specify that the functional relationship between forging time and steel ingot temperature so that forgeability
Increase.Because have employed the 20CrNi4 material after improvement, therefore in the temperature meeting suitably of nitrogen treatment and oxidation processes
Rise, but the time processed is shorter, less to the consumption of nitrogen and ethanol, after using the isothermal holding in five stages, it is possible to make
The performance of top is optimal, and density and the intensity of product are higher, and wearability is more preferable, extends the service life of product.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention；
Fig. 2 is temperature control system schematic diagram of the present invention；
Fig. 3 is the temperature control curve that the present invention provides.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that described herein
Specific embodiment only in order to explain the present invention, is not intended to limit the present invention.
First embodiment of the invention provides the manufacture method of a kind of piercing plug for seamless steel tubes, sees accompanying drawing 1, bag
Include following steps:
Step 1, pre-forging, by Heating Steel Ingots to 150～200 DEG C, forge 5 minutes to it.
Described steel ingot uses the 20CrNi4 material improved.Former 20CRNI4 chemical analysis is (by weight): carbon C:0.10～
0.17, silicon Si:0.17～0.37, manganese Mn:0.30～0.60, sulfur S: allow residual content≤0.035, phosphorus P: allow residual content
≤ 0.03, chromium Cr:0.60～0.90, nickel: 2.75～3.15, copper Cu: allow residual content≤0.030.After improvement
Adding a small amount of zinc Zn in 20CrNi4 material, after improvement, 20CRNI4 chemical analysis is: carbon C:0.10～0.17, silicon Si:
0.17～0.37, zinc Zn:0.05-0.1, manganese Mn:0.30～0.60, sulfur S: allow residual content≤0.035, phosphorus P: allow remnants
Content≤0.03, chromium Cr:0.60～0.90, nickel: 2.75～3.15, copper Cu: allowing residual content≤0.030, remaining is ferrum
Fe.Owing to adding zinc element, make perforating head while can meeting the necessary rigidity of perforation, also have good can
Forgeability.
It will be understood by those of skill in the art that in interchangeable scheme, the 20CrNi4 material of routine can be used.
Steel ingot temperature, after pre-forging, is heated to lower than its overtemperature 20～40 DEG C, such as, for changing by step 2.
For 20CrNi4 material after entering, between its heating-up temperature is 1000-1100 DEG C, between preferably 1020-1040 DEG C and right
It forges.While intensification forging it, along with the increase of temperature, the performance of steel ingot is constantly improved.
As in figure 2 it is shown, present invention also offers a kind of temperature control system, for controlling to heat the temperature of steel ingot, when adding
Heat is forged to it being taken out from boiler during predetermined temperature, monitors the temperature of steel ingot, when steel ingot temperature in forging process
During less than predetermined temperature 100 DEG C, it is reheated and is warming up to predetermined temperature, so, it is ensured that forging time is not less than 30 minutes.
Inside of boiler is heated as controlled device, electrothermal tube by described temperature control system using inside of boiler, certainly
In other embodiments, it would however also be possible to employ other mode of heating.Temperature transmitter detects that inside of boiler temperature signal is made
For feedback signal, specified rate relatively after difference controlled output voltage (the i.e. three-phase electricity of three-phase voltage regulation module by actuator
Add the terminal voltage of heat pipe), to reach to control the purpose of inside of boiler temperature.Include an actuator, actuator the most within the system
Connecting three-dimensional SCR adjustment module, described three-dimensional SCR adjustment module is connected with electrical heating module, for controlling electrical heating module
Voltage, electrical heating Module Links inside of boiler, inside of boiler is heated, temperature transmitter connects inside of boiler to be carried out it
Temperature detection, feeds back to connected actuator by temperature signal.
In the technical program, the relation between forging time and steel ingot temperature is as follows: the highest forging time of temperature is the shortest,
Otherwise, the lowest forging time of temperature is the longest, but temperature overall control is lower than its overtemperature 20～40 DEG C.
Further, there is following relation in forging time and temperature: setting Y as steel ingot temperature, x is forging time, then,
Y (x)=407*(log(x))2/(1+x2)
Wherein, log is natural logrithm.Its temperature control curve is as it is shown on figure 3, in Fig. 3, x-axis is heating-up temperature (unit
DEG C), y-axis is forging time (unit: second).
By this temperature curve, can accurately control the forging time of steel ingot, it is to avoid because the steel ingot of different batches is in heating
During and forging process in by virtue of experience operate and the spotty defect of round steel that causes so that obtaining after forging
The stable performance of round steel is consistent.
The round steel that step 3. obtains is incubated in the environment of lower than its overtemperature 100 DEG C, makes blank by die forging；Profit
Blank deformation is made to obtain forging with mould.
Step 4. heat treatment: air cooling after blank 680 DEG C insulation is cooled to the furnace 300 DEG C in 8 hours.
The product that step 4 is obtained by step 5. carries out nitrogen treatment at 950 DEG C, adds ethanol during process, and 1100 DEG C are carried out
Oxidation processes.Because have employed the 20CrNi4 material after improvement, therefore in the temperature meeting suitably of nitrogen treatment and oxidation processes
Rising, the effect processed when said temperature point is best.Specifically, after gas carbruizing furance furnace temperature is raised to 950 DEG C, in burner hearth
It is passed through ethanol and nitrogen, and keeps 25-28 minute, then the oxidation basket installing top is loaded in stove, seal fire door, make stove
Heat up, continue in burner hearth, be passed through the ethanol of 70 droplets/point and 115ml/ divides nitrogen, until furnace temperature rises to 1100 DEG C, then toward burner hearth
Inside being passed through the water of 120 droplets/point, after keeping 100 minutes, then reduce the intake of water to 80 droplets/point, regulation stove holding temperature is extremely
900 DEG C, 890 DEG C, 880 DEG C, 870 DEG C, 860 DEG C, and each temperature section stop 10 minutes, use five stages isothermal holding
After, it is possible to the performance making top is optimal.It is then shut off stove heating system, stops being passed through of water, adjust ethanol intake and arrive
90 droplets/point, until furnace temperature drops to 800 DEG C, oxidizing process completes.
Technical scheme has the advantage that steel ingot uses the 20CrNi4 material improved, owing to adding zinc unit
Element, make perforating head while can meeting the necessary rigidity of perforation, also have good can forgeability.Have employed temperature
Degree control system controls the temperature of heating steel ingot, it is taken out from boiler when being heated to predetermined temperature and forges, in forging
Monitor the temperature of steel ingot during making, and specify that the functional relationship between forging time and steel ingot temperature so that forgeability
Increase.Because have employed the 20CrNi4 material after improvement, therefore in the temperature meeting suitably of nitrogen treatment and oxidation processes
Rise, but the time processed is shorter, less to the consumption of nitrogen and ethanol, after using the isothermal holding in five stages, it is possible to make
The performance of top is optimal, and density and the intensity of product are higher, and wearability is more preferable, extends the service life of product.
Described above illustrate and describes the preferred embodiments of the present invention, as previously mentioned, it should be understood that the present invention not office
Be limited to form disclosed herein, be not to be taken as the eliminating to other embodiments, and can be used for other combinations various, amendment and
Environment, and can be changed by above-mentioned teaching or the technology of association area or knowledge in invention contemplated scope described herein
Dynamic.And the change that those skilled in the art are carried out and change are without departing from the spirit and scope of the present invention, the most all should be appended by the present invention
In scope of the claims.
Claims (10)
1. the manufacture method of a piercing plug for seamless steel tubes, it is characterised in that: comprise the steps:
Step 1, pre-forging, by Heating Steel Ingots to 150～200 DEG C, forge 5 minutes to it；
Step 2, after pre-forging, steel ingot temperature is heated to lower than its overtemperature 20～40 DEG C；
Step 3, the round steel obtained are incubated in the environment of lower than its overtemperature 100 DEG C, make blank by die forging；Utilize mould
Tool makes blank deformation obtain forging；
Step 4, to blank 680 DEG C insulation within 8 hours, cool to 300 DEG C with the furnace after air cooling；
Step 5, the product obtaining step 4 carry out nitrogen treatment at 950 DEG C.
2. the manufacture method of piercing plug for seamless steel tubes as claimed in claim 1, it is characterised in that: described steel ingot chemical analysis
For: carbon C:0.10～0.17, silicon Si:0.17～0.37, zinc Zn:0.05-0.1, manganese Mn:0.30～0.60, sulfur S: allow remnants
Content≤0.035, phosphorus P: allow residual content≤0.03, chromium Cr:0.60～0.90, nickel: 2.75～3.15, copper Cu: allow
Residual content≤0.030, remaining is ferrum Fe.
3. the manufacture method of piercing plug for seamless steel tubes as claimed in claim 2, it is characterised in that: described step 3 is forged
There is following relation in time and temperature: setting Y as steel ingot temperature, x is forging time, then, Y (x)=407*(log(x))2/(1+
x2)；Adding ethanol during nitrogen treatment in described step 4,1100 DEG C carry out oxidation processes.
4. the manufacture method of piercing plug for seamless steel tubes as claimed in claim 3, it is characterised in that: when gas carbruizing furance furnace temperature
After being raised to 950 DEG C, in burner hearth, it is passed through ethanol and nitrogen.
5. the manufacture method of piercing plug for seamless steel tubes as claimed in claim 4, it is characterised in that: in burner hearth, it is passed through ethanol
And after nitrogen, keep 25-28 minute.
6. the manufacture method of piercing plug for seamless steel tubes as claimed in claim 5, it is characterised in that: after keeping 25-28 minute,
Again the oxidation basket installing top is loaded in stove, seal fire door, make stove heat up, continue to be passed through 70 droplets'/point in burner hearth
Ethanol and 115ml/ divide nitrogen, until furnace temperature rises to 1100 DEG C.
7. the manufacture method of piercing plug for seamless steel tubes as claimed in claim 6, it is characterised in that: furnace temperature rises to 1100 DEG C
After, then toward being passed through the water of 120 droplets/point in burner hearth, keep 100 minutes.
8. the manufacture method of piercing plug for seamless steel tubes as claimed in claim 7, it is characterised in that: after keeping 100 minutes, then
Reduce the intake of water to 80 droplets/point, regulation stove holding temperature to 900 DEG C, 890 DEG C, 880 DEG C, 870 DEG C, 860 DEG C, and
Each temperature section stops 10 minutes.
9. the manufacture method of piercing plug for seamless steel tubes as claimed in claim 8, it is characterised in that: each temperature section stops 10
After minute, closing stove heating system, stop being passed through of water, adjustment ethanol intake is to 90 droplets/point, until furnace temperature drops to 800
DEG C, oxidizing process completes, and is then shut off stove heating system, stops being passed through of water, and adjustment ethanol intake is to 90 droplets/point, directly
Dropping to 800 DEG C to furnace temperature, oxidizing process completes.
10. a temperature control system, it is characterised in that: including an actuator, actuator connects three-dimensional SCR adjustment module, institute
State three-dimensional SCR adjustment module to be connected with electrical heating module, for controlling the voltage of electrical heating module, electrical heating Module Links boiler
Inner bag, heats inside of boiler, and temperature transmitter connects inside of boiler and it is carried out temperature detection, is fed back by temperature signal
To connected actuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610463146.9A CN106148818B (en) | 2016-06-23 | 2016-06-23 | A kind of manufacturing method and its temperature control system of piercing plug for seamless steel tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610463146.9A CN106148818B (en) | 2016-06-23 | 2016-06-23 | A kind of manufacturing method and its temperature control system of piercing plug for seamless steel tubes |
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| Publication Number | Publication Date |
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| CN106148818A true CN106148818A (en) | 2016-11-23 |
| CN106148818B CN106148818B (en) | 2018-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207904A (en) * | 2018-08-31 | 2019-01-15 | 上海大学 | Piercing plug for seamless steel tubes manufacturing method |
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|---|---|---|---|---|
| CN1659297A (en) * | 2002-06-14 | 2005-08-24 | 新日本制铁株式会社 | Steel excellent in machinability |
| CN101070561A (en) * | 2006-05-12 | 2007-11-14 | 江苏南山冶金机械制造有限公司 | Through-hole top-end heat-treatment processing process |
| CN101942610A (en) * | 2010-08-05 | 2011-01-12 | 黄贞益 | Piercing plug for hot-rolled seamless steel pipe and processing technology thereof |
| CN102586700A (en) * | 2012-03-05 | 2012-07-18 | 宜兴市景程模具有限公司 | High alloy tube piercing plug material and manufacturing method and surface processing method thereof |
| CN103160749A (en) * | 2013-02-07 | 2013-06-19 | 宁波市鄞州文昌金属制品有限公司 | Seamless steel pipe perforating plug and manufacture method |
| CN104325259A (en) * | 2014-08-29 | 2015-02-04 | 南通市嘉业机械制造有限公司 | Manufacturing method of seamless steel pipe piercing plug |
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2016
- 2016-06-23 CN CN201610463146.9A patent/CN106148818B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1659297A (en) * | 2002-06-14 | 2005-08-24 | 新日本制铁株式会社 | Steel excellent in machinability |
| CN101070561A (en) * | 2006-05-12 | 2007-11-14 | 江苏南山冶金机械制造有限公司 | Through-hole top-end heat-treatment processing process |
| CN101942610A (en) * | 2010-08-05 | 2011-01-12 | 黄贞益 | Piercing plug for hot-rolled seamless steel pipe and processing technology thereof |
| CN102586700A (en) * | 2012-03-05 | 2012-07-18 | 宜兴市景程模具有限公司 | High alloy tube piercing plug material and manufacturing method and surface processing method thereof |
| CN103160749A (en) * | 2013-02-07 | 2013-06-19 | 宁波市鄞州文昌金属制品有限公司 | Seamless steel pipe perforating plug and manufacture method |
| CN104325259A (en) * | 2014-08-29 | 2015-02-04 | 南通市嘉业机械制造有限公司 | Manufacturing method of seamless steel pipe piercing plug |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207904A (en) * | 2018-08-31 | 2019-01-15 | 上海大学 | Piercing plug for seamless steel tubes manufacturing method |
| CN109207904B (en) * | 2018-08-31 | 2020-10-16 | 上海大学 | Method for manufacturing seamless steel pipe piercing plug |
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| Publication number | Publication date |
|---|---|
| CN106148818B (en) | 2018-09-11 |
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