CN114798802A - Bimetal tube processing method - Google Patents
Bimetal tube processing method Download PDFInfo
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- CN114798802A CN114798802A CN202210501857.6A CN202210501857A CN114798802A CN 114798802 A CN114798802 A CN 114798802A CN 202210501857 A CN202210501857 A CN 202210501857A CN 114798802 A CN114798802 A CN 114798802A
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- 238000003672 processing method Methods 0.000 title claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 56
- 239000002184 metal Substances 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000013329 compounding Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000010622 cold drawing Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 45
- 239000010959 steel Substances 0.000 claims description 45
- 229910045601 alloy Inorganic materials 0.000 claims description 26
- 239000000956 alloy Substances 0.000 claims description 26
- 229910000570 Cupronickel Inorganic materials 0.000 claims description 23
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 8
- 238000005488 sandblasting Methods 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims 1
- 239000007769 metal material Substances 0.000 abstract description 8
- 238000010008 shearing Methods 0.000 abstract description 4
- 238000005219 brazing Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 33
- 238000005452 bending Methods 0.000 description 10
- 239000002994 raw material Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 229910003336 CuNi Inorganic materials 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000013003 hot bending Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011067 equilibration Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/09—Making tubes with welded or soldered seams of coated strip material ; Making multi-wall tubes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Abstract
The invention discloses a processing method of a bimetal composite pipe, which comprises the following processing steps: winding a metal tape for brazing on the outer surface of the inner tube; sleeving the inner pipe wound with the metal belt into the outer pipe; the outer pipe and the inner pipe are jointed together through cold drawing to finish mechanical compounding; placing the composite pipe blank after mechanical compounding into a heat treatment furnace for heating and preserving heat to promote the molecules of the metal belt to diffuse into the inner pipe and the outer pipe; taking out the composite pipe blank and cooling to room temperature. The method can greatly improve the bonding strength between the inner layer metal material and the outer layer metal material of the bimetal composite pipe, can completely offset the interfacial shearing force caused by thermal expansion, and can not generate relative slippage between the two layers of metal.
Description
Technical Field
The invention belongs to a manufacturing technology of a bimetal composite pipe, and particularly relates to a processing method of an inner-clad copper-nickel alloy bimetal pipe.
Background
At present, 20# steel seamless steel pipes are needed to be used in a large quantity in the manufacturing process of ships and naval vessels running at sea, and the 20# steel is not resistant to seawater corrosion, so that the pipelines need to be repaired and replaced at any time, which not only causes the maintenance cost to be greatly improved, but also brings inconvenience in use. For seawater, the most suitable corrosion-resistant material is B10 CuNi alloy pipe, but the material is very expensive, and for this reason, if 20# steel seamless pipe and CuNi alloy pipe can be compounded to form the bimetal composite pipe, the material cost can be greatly reduced.
The traditional mechanical composite bimetallic pipe has the advantages that the inner layer metal and the outer layer metal are only physically attached, the bonding strength is low (generally less than or equal to 2.0 MPa), and the difference of the thermal expansion coefficients of the inner layer metal material and the outer layer metal material is large, so that the composite pipe is not suitable for being used in high-temperature places (generally greater than or equal to 250 ℃), is not suitable for cold bending processing, and cannot meet the tortuous connection mode of a pipeline for a ship in a narrow deck bin.
Disclosure of Invention
Aiming at the defects of the prior art, the invention designs a processing method of a bimetal pipe, which can greatly improve the bonding strength between the inner layer and the outer layer of metal materials of the bimetal composite pipe.
The technical scheme disclosed by the invention is as follows: a bimetal tube processing method comprises the following processing steps:
(1) winding a metal strip used as a soldering flux on the surface of the inner tube;
(2) sleeving the inner pipe wound with the metal belt into the outer pipe;
(3) the outer pipe and the inner pipe are jointed together through cold drawing to finish mechanical compounding;
(4) placing the composite pipe blank after mechanical compounding into a heat treatment furnace for heating and preserving heat to promote the molecules of the metal belt to diffuse into the inner pipe and the outer pipe;
(5) taking out the composite pipe blank and cooling to room temperature.
The inner tube is a B10 copper-nickel alloy seamless tube, and the outer tube is a No. 20 steel seamless steel tube.
On the basis of the scheme, the metal belt is preferably a red copper steel belt, the outer wall of the copper-nickel alloy pipe is cleaned, and after oil and dirt are removed, the red copper steel belt with the wall thickness of 0.4-0.8 mm is uniformly wound in a spiral shape.
On the basis of the scheme, the inner wall of the No. 20 steel seamless pipe is subjected to sand blasting rust removal treatment preferably before the inner pipe is sleeved in the outer pipe, and the rust removal grade reaches Sa2.5.
Based on the scheme, the inner pipe is preferably reduced by 1-2 mm in diameter in the mechanical compounding process.
On the basis of the scheme, preferably, the two ends of the composite pipe blank after mechanical compounding are cut according to the fixed length, and then the cut composite pipe blank is placed into a heat treatment furnace.
On the basis of the scheme, the heat treatment furnace is preferably heated to the temperature of 910-.
Compared with the prior art, the invention has the following beneficial effects:
the method can greatly improve the bonding strength between the inner layer metal material and the outer layer metal material of the bimetal composite pipe.
The inner tube is a B10 copper-nickel alloy seamless tube, the outer tube is a No. 20 steel seamless steel tube, the inner tube is wound with a red copper steel strip and then the processing method is utilized, the interfacial shearing force caused by thermal expansion can be completely counteracted, the two layers of metal cannot generate relative slip, and the composite tube manufactured according to the process method can meet the use requirements of high temperature resistance, cold bending, hot bending, random cutting and the like.
Drawings
FIG. 1 is a schematic view of an inner tube, an outer tube and a structure in which the inner tube is inserted into the outer tube;
FIG. 2 is a schematic view showing the fitting of an outer pipe and an inner pipe in a mechanical compounding process;
fig. 3 is a schematic view of the clad pipe blank in a heat treatment furnace.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It should be apparent that the drawings in the following description are merely exemplary embodiments of the invention, and that those skilled in the art will be able to derive other drawings and embodiments from them without the exercise of inventive faculty.
As shown in fig. 1-3, a method for processing a bimetallic pipe includes the following steps:
(1) winding a metal belt used as a soldering flux on the surface of an inner pipe, wherein the inner pipe is a B10 copper-nickel alloy seamless pipe;
(2) sleeving an inner pipe wound with a metal belt into an outer pipe in a penetrating manner, wherein the outer pipe is a No. 20 steel seamless steel pipe;
(3) the outer pipe and the inner pipe are jointed together through cold drawing to finish mechanical compounding;
(4) placing the composite pipe blank after mechanical compounding into a heat treatment furnace for heating and preserving heat to promote the molecules of the metal belt to diffuse into the inner pipe and the outer pipe;
(5) taking out the composite pipe blank and cooling to room temperature.
In the processing method, the metal band is wound on the surface of the inner pipe, the inner pipe and the outer pipe are mechanically compounded, and then the compound pipe blank is placed in a heat treatment furnace for heating and heat preservation to promote molecules of the metal band to diffuse into the inner pipe and the outer pipe, so that metallurgical fusion between the inner pipe and the metal band and between the outer pipe and the metal band is realized.
The metal belt is a red copper steel belt, the outer wall of the copper-nickel alloy pipe is cleaned, and after oil and dirt are removed, the red copper steel belt with the wall thickness of 0.4-0.8 mm is uniformly wound in a spiral shape.
And (3) carrying out sand blasting and rust removing treatment on the inner wall of the No. 20 steel seamless pipe before the inner pipe is sleeved in the outer pipe, wherein the rust removing grade reaches Sa2.5.
The diameter of the inner pipe is reduced by 1-2 mm in the mechanical compounding process.
Cutting the two ends of the mechanically compounded composite pipe blank according to the fixed length, and then placing the cut composite pipe blank into a heat treatment furnace.
The heat treatment furnace is heated to 910 ℃ and 925 ℃ and is kept warm for at least two hours.
The more specific implementation method is as follows:
selecting the types of the inner pipe material and the outer pipe material: the pipe diameter is less than or equal to 500mm, the outer pipe is a No. 20 steel seamless steel pipe, and the inner pipe is a B10 copper-nickel alloy seamless pipe.
Wherein, the seamless steel pipe of 20# steel selects the material: the outer diameter of the seamless pipe is selected according to the product outer diameter multiplied by 1.03-1.06, and the wall thickness of the seamless pipe is consistent with the wall thickness of the product required by the design;
and performing sand blasting and rust removing treatment on the inner wall of the No. 20 steel seamless pipe, wherein the rust removing grade reaches Sa2.5.
B10 copper-nickel alloy seamless tube selection: the outer diameter of the copper-nickel alloy seamless pipe is 1-2 mm larger than that of the finished alloy pipe, and the wall thickness is consistent with that of the finished alloy pipe required by the design;
cleaning the outer wall of the copper-nickel alloy pipe, removing oil, dirt and an oxide layer, and then spirally winding a red copper film (a red copper steel belt) with the thickness of 0.4-0.8 mm.
And (4) inserting the copper-nickel alloy pipe wound with the red copper steel strip into the seamless 20# steel pipe along the axial direction to complete the assembling process.
And (3) placing the assembled composite pipe blank on a cold drawing machine, forcibly reducing the diameter of the outer 20# steel seamless pipe in a drawing mode, attaching the outer wall of the inner pipe and continuously reducing the diameter of the outer layer steel seamless pipe and the inner pipe by 1-2 mm so as to ensure that enough residual contact pressure exists between the two layers of pipes.
Placing the composite pipe blank after drawing into a heat treatment furnace, heating to 910-;
and taking out the composite pipe blank, naturally cooling to normal temperature at room temperature, and cutting, straightening, nondestructive testing, hydrostatic testing and weighing and label spraying the two ends of the steel pipe according to the required fixed length.
Requirements for bimetallic composite pipes: the fact that mechanical composite tubes are not resistant to high temperature is a common recognition in the industry. According to theoretical analysis, GB/T20801.2-2006 appendix B physical properties of materials can be consulted, and the total thermal expansion amount of 20# steel and the copper-nickel alloy per meter at 200 ℃ is different by about 0.67 mm; if the specified length of the pipe is calculated according to 6 meters/pipe, the cumulative difference of the total thermal expansion amount of the metal at the inner layer and the outer layer of each pipe is 4.02 millimeters (0.67 x 6= 4.02); at this time, if the two layers of metals are only mechanically bonded (the bonding strength is less than or equal to 2.0 MPa), the bonding strength is difficult to offset the interfacial shear force caused by the difference of the total thermal expansion amount, so that interlayer slippage occurs, the pipeline fails, and in severe cases, the phenomenon of inward bulging occurs because the expansion margin of the inner layer steel pipe cannot be eliminated.
Similarly, the reason why the mechanical composite pipe is not suitable for cold bending is also recognized by the industry. The method is mainly characterized in that the bonding strength between the inner layer metal and the outer layer metal is not enough (the bonding strength is less than or equal to 2.0 MPa), the metal pipeline is strongly extruded and deformed in the cold bending process, the shearing force generated by the bonding interface of the two layers of metal is very large at the moment, so that the inner layer steel pipe and the outer layer 20# steel are deformed asynchronously, and finally, the inner layer wrinkles (or bulges) appear.
According to the processing method, the actually measured value of the interfacial shear strength of the internally-coated copper-nickel alloy composite pipe (metallurgical bonding) is larger than or equal to 270MPa, and the interfacial shear force caused by thermal expansion can be completely counteracted (the lowest shear loudness of the metallurgical bonding composite pipe specified in GB/T28883-2012 composite seamless steel pipe for bearing table 6 is only 140 MPa). The two metal joint surfaces can not generate relative slippage.
Corresponding concrete example 1, take finished product composite pipe D108 (5+2) as an example:
A. outer diameter of the inner tube of the raw material: the thickness of the red copper steel belt is 2 mm, and the red copper steel belt with the thickness of 0.5 mm is spirally and uniformly wound;
B. the diameter of the outer tube of the raw material is 114 mm, and the wall thickness is 5 mm;
C. after the drawing composition is completed, the diameter of the outer tube in the obtained mechanical composite tube becomes 108 mm, and is reduced by 6 mm (114-108 =6 mm);
D. after the completion of the drawing and compounding, the outer diameter of the resulting copper-nickel alloy seamless tube was reduced by 1 mm (98-97 =1 mm) to 97 mm in the resulting mechanical composite tube
E. Placing the composite pipe blank after mechanical compounding into a heat treatment furnace with an accurate temperature control device, and heating to 920 ℃; balancing for two hours; and (3) detection results: the interface is completely jointed, and the shear strength between the inner layer metal and the outer layer metal reaches 270 MPa. The composite pipe manufactured by the processing method can meet the requirements of high-temperature places and cold bending processing.
In the corresponding embodiment 2, the finished composite pipe D159 (5+3) is taken as an example
A. Outer diameter of the inner tube of the raw material: 150 mm, 3 mm in wall thickness, and spirally and uniformly winding a red copper steel belt with 0.5 mm in wall thickness;
B. the diameter of the outer tube of the raw material is 168 mm, and the wall thickness is 5 mm;
C. after the completion of the drawing composition, the diameter of the outer tube in the obtained mechanical composite tube becomes 159 mm, which is reduced by 9 mm (168-;
D. after the drawing composition is finished, the outer diameter of the copper-nickel alloy seamless tube in the obtained mechanical composite tube is 148 mm, and is reduced by 2 mm (150- & lt148 =2 mm)
E. Placing the composite pipe blank after mechanical compounding into a heat treatment furnace with an accurate temperature control device, and heating to 920 ℃; balancing for two hours; and (3) detection results: the interface is completely jointed, and the shearing strength between the inner layer metal and the outer layer metal reaches 278 MPa. The composite pipe manufactured by the processing method can meet the requirements of high-temperature places and cold bending processing.
Corresponding concrete example 3, take finished product composite pipe D108 (5+2) as an example:
A. purchasing the outer diameter of the raw material inner pipe: the thickness of the red copper steel belt is 2 mm, and the red copper steel belt with the thickness of 0.5 mm is spirally and uniformly wound;
B. purchasing a raw material with an outer pipe diameter of 114 mm and a wall thickness of 5 mm;
C. after the drawing composition is completed, the diameter of the outer tube in the obtained mechanical composite tube becomes 108 mm, and is reduced by 6 mm (114-;
D. after the completion of the drawing and compounding, the outer diameter of the resulting copper-nickel alloy seamless tube was reduced by 1 mm (98-97 =1 mm) to 97 mm in the resulting mechanical composite tube
E. Placing the composite pipe blank after mechanical compounding into a heat treatment furnace with an accurate temperature control device, and heating to 890 ℃; balancing for two hours; and (3) detection results: the interface is not jointed, and the shear strength between the inner layer metal and the outer layer metal is only 1.0 MPa. The detection result does not meet the requirements of high-temperature places and cold bending processing.
In the embodiment 4, the finished composite pipe D159 (5+3) is taken as an example
A. Purchasing the outer diameter of the raw material inner pipe: 150 mm, 3 mm in wall thickness, and spirally and uniformly winding a red copper steel belt with 0.5 mm in wall thickness;
B. purchasing a raw material outer pipe with the diameter of 168 mm and the wall thickness of 5 mm;
C. after the completion of the drawing composition, the diameter of the outer tube in the obtained mechanical composite tube becomes 159 mm, which is reduced by 9 mm (168-;
D. after the drawing composition is finished, the outer diameter of the copper-nickel alloy seamless tube in the obtained mechanical composite tube is 148 mm, and is reduced by 2 mm (150- & lt148 =2 mm)
E. Placing the composite pipe blank after mechanical compounding into a heat treatment furnace with an accurate temperature control device, and heating to 925 ℃; balancing for two hours; and (3) detection results: the interface is completely jointed, and the shear strength between the inner layer metal and the outer layer metal reaches 290 MPa. The detection result completely meets the requirements of high-temperature places and cold bending processing.
Note: after 2 hours of balance at 925 ℃, the grain size of the copper-nickel alloy is enlarged to be close to the critical value specified by the standard;
in the corresponding embodiment 5, the finished composite pipe D159 (5+3) is taken as an example
A. Purchasing the outer diameter of the raw material inner pipe: 150 mm, 3 mm in wall thickness, and spirally and uniformly winding a red copper steel belt with 0.5 mm in wall thickness;
B. purchasing a raw material outer pipe with the diameter of 168 mm and the wall thickness of 5 mm;
C. after the completion of the drawing composition, the diameter of the outer tube in the obtained mechanical composite tube becomes 159 mm, which is reduced by 9 mm (168-;
D. after the drawing composition is finished, the outer diameter of the copper-nickel alloy seamless tube in the obtained mechanical composite tube is 148 mm, and is reduced by 2 mm (150- & lt148 =2 mm)
E. Placing the composite pipe blank after mechanical compounding into a heat treatment furnace with an accurate temperature control device, and heating to 930 ℃; balancing for two hours; and (3) detection results: the interface is completely jointed, and the shear strength between the inner layer metal and the outer layer metal reaches 301 MPa. The detection result completely meets the requirements of high-temperature places and cold bending processing.
Note: after 2 hours of equilibration at 930 ℃, the grain structure of the copper-nickel alloy becomes larger and exceeds the maximum limit specified by the standard.
In conclusion, the technology can realize metallurgical fusion between the outer 20# steel seamless pipe and the inner B10 copper-nickel alloy pipe, greatly improve the bonding strength between the inner and outer metal materials of the bimetal composite pipe (the shear strength of the two metal layers can reach more than 140 MPa), and the composite pipe manufactured by the process method can meet the use requirements of high temperature resistance, cold bending, hot bending, random cutting and the like.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The machining method of the bimetallic tube is characterized by comprising the following process steps of:
(1) winding a metal strip used as a soldering flux on the surface of the inner tube;
(2) sleeving the inner pipe wound with the metal belt into the outer pipe;
(3) the outer pipe and the inner pipe are jointed together through cold drawing to finish mechanical compounding;
(4) placing the composite pipe blank after mechanical compounding into a heat treatment furnace for heating and preserving heat to promote the molecules of the metal belt to diffuse into the inner pipe and the outer pipe;
(5) taking out the composite pipe blank and cooling to room temperature.
2. The method of processing bimetallic pipe as in claim 1, wherein the inner pipe is a B10 cupronickel seamless pipe and the outer pipe is a 20# steel seamless steel pipe.
3. The process for producing a bimetallic pipe as in claim 2, wherein the metal strip is a red copper strip, the outer wall of the copper-nickel alloy pipe is cleaned, and after removing oil and dirt, the red copper strip with a wall thickness of 0.4 to 0.8 mm is uniformly wound in a spiral shape.
4. The method for processing the bimetallic pipe as in claim 2, wherein the inner wall of the seamless steel pipe of No. 20 steel is subjected to sand blasting rust removal treatment before the inner pipe is sleeved in the outer pipe, and the rust removal grade reaches Sa2.5.
5. The method of processing bimetallic pipe of claim 2, wherein the inner pipe is reduced in diameter by 1-2 mm during the mechanical compounding process.
6. The bimetal tube processing method of claim 2, wherein both ends of the mechanically combined composite tube blank are cut to a predetermined length, and the cut composite tube blank is placed in a heat treatment furnace.
7. The method of claim 2, wherein the heat treatment furnace is heated to a temperature of 910-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210501857.6A CN114798802A (en) | 2022-05-10 | 2022-05-10 | Bimetal tube processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210501857.6A CN114798802A (en) | 2022-05-10 | 2022-05-10 | Bimetal tube processing method |
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| CN114798802A true CN114798802A (en) | 2022-07-29 |
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| CN202210501857.6A Pending CN114798802A (en) | 2022-05-10 | 2022-05-10 | Bimetal tube processing method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1429727A (en) * | 1965-04-01 | 1966-02-25 | Revere Copper & Brass Inc | Metallurgically bonded composite metal structures |
| CN1375362A (en) * | 2002-04-11 | 2002-10-23 | 中国石化集团洛阳石油化工工程公司 | Manufacture of bimetallic composite pipe |
| CN101566256A (en) * | 2009-06-04 | 2009-10-28 | 大连合生科技开发有限公司 | Stainless steel composite steel pipe and manufacturing method thereof |
| CN101670383A (en) * | 2009-07-20 | 2010-03-17 | 大连合生科技开发有限公司 | Method for manufacturing inner covered stainless steel compound steel pipe |
| CN104772362A (en) * | 2015-04-21 | 2015-07-15 | 承德石油高等专科学校 | Technology for preparing stainless steel/carbon steel composite reinforcing steel bars by virtue of drawing-brazing |
| CN105537316A (en) * | 2016-01-15 | 2016-05-04 | 上海天阳钢管有限公司 | Manufacturing method for stainless steel composite tube |
-
2022
- 2022-05-10 CN CN202210501857.6A patent/CN114798802A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1429727A (en) * | 1965-04-01 | 1966-02-25 | Revere Copper & Brass Inc | Metallurgically bonded composite metal structures |
| CN1375362A (en) * | 2002-04-11 | 2002-10-23 | 中国石化集团洛阳石油化工工程公司 | Manufacture of bimetallic composite pipe |
| CN101566256A (en) * | 2009-06-04 | 2009-10-28 | 大连合生科技开发有限公司 | Stainless steel composite steel pipe and manufacturing method thereof |
| CN101670383A (en) * | 2009-07-20 | 2010-03-17 | 大连合生科技开发有限公司 | Method for manufacturing inner covered stainless steel compound steel pipe |
| CN104772362A (en) * | 2015-04-21 | 2015-07-15 | 承德石油高等专科学校 | Technology for preparing stainless steel/carbon steel composite reinforcing steel bars by virtue of drawing-brazing |
| CN105537316A (en) * | 2016-01-15 | 2016-05-04 | 上海天阳钢管有限公司 | Manufacturing method for stainless steel composite tube |
Non-Patent Citations (1)
| Title |
|---|
| 白培康等: "材料成型新技术", 31 May 2007, 国防科技出版社, pages: 134 - 136 * |
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