CN111889985A - Production process of iron white copper and red copper composite pipe - Google Patents
Production process of iron white copper and red copper composite pipe Download PDFInfo
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- CN111889985A CN111889985A CN202010783573.1A CN202010783573A CN111889985A CN 111889985 A CN111889985 A CN 111889985A CN 202010783573 A CN202010783573 A CN 202010783573A CN 111889985 A CN111889985 A CN 111889985A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention relates to a production technology of a composite tube of iron white copper and red copper, which mainly aims at the production technology of a corrosion-resistant heat exchange tube with the outer surface needing corrosion resistance and the inner surface needing good heat exchange performance, and belongs to the technical field of alloy tube preparation. The process comprises the following steps: respectively and horizontally continuously casting iron white copper and red copper hollow pipes, respectively milling the outer surfaces, sleeving and welding one end surface, planetary rolling, coiling and drawing, jointly drawing, carrying out online flaw detection, cleaning, finishing, annealing, packaging and warehousing. The invention adopts the technology of sleeving two copper and copper alloy pipes with different brands and rolling the copper and copper alloy pipes in parallel to enable the copper and copper alloy pipes to generate intermetallic molecules to mutually infiltrate and weld on the basis of producing the iron white copper and the red copper by the traditional process, and can well produce the corrosion-resistant heat exchange pipe with good outer surface corrosion resistance and good inner surface heat exchange performance required by a chemical equipment heat exchanger.
Description
Technical Field
The invention relates to the technical field of alloy pipe preparation, in particular to a production process of an iron-white-copper and red-copper composite pipe.
Background
BFe30-1-1 has good corrosion resistance in seawater, fresh water and steam; has excellent weldability and cold and hot workabilityCan be widely applied to petrochemical industry, aerospace and ship industries; t2 copper is used in heat exchangers in various industries because of its excellent heat conductivity and cold and hot workability. A corrosion-resistant heat exchange tube with good outer surface corrosion resistance and good inner surface heat exchange performance is needed in chemical equipment, and the original B Fe30-1-1 tube has good corrosion resistance but no excellent heat exchange effect compared with T2: the thermal conductivity of BFe30-1-1 is 29/W (m.K) at 20 DEG C-1The thermal conductivity of T2 was 380/W. (m.K) -1. Therefore, the number of the BFe30-1-1 pipes is increased to achieve the heat exchange effect in design, meanwhile, the price of nickel is far higher than that of copper, and the heat exchange effect can be increased and the manufacturing cost can be reduced by using the T2 as the inner layer.
Disclosure of Invention
The invention aims to overcome the defects and provides a production process of an iron-white-copper and red-copper composite pipe, which is characterized by comprising the following steps:
1) casting iron white copper hollow ingots and red copper hollow ingots on a horizontal continuous casting furnace;
2) respectively milling the outer surfaces of the iron white copper and the red copper hollow cast ingot to enable the outer diameter of the red copper hollow cast ingot to be 0.5-3mm smaller than the inner diameter of the iron white copper hollow cast ingot, sleeving the red copper hollow cast ingot in the iron white copper hollow cast ingot, and aligning and welding the two end faces;
3) sleeving welded outer-layer iron white copper and inner-layer red copper hollow cast ingots, carrying out hot rolling on the cast ingots by a three-roller planetary rolling mill, cooling to generate a compact welded layer, and coiling the rolled red copper on line to form a composite coil pipe;
4) reducing the diameter of the composite coil pipe on a high-speed coil drawing machine, and reducing the wall thickness of the composite coil pipe to the required outer diameter wall thickness;
5) drawing the composite coil pipe subjected to diameter reduction in the step 4) to a required size on a cam drawing and sizing unit on line, and simultaneously performing a finishing process; or on-line cleaning, flaw detection and rewinding and refining on a double-drum rewinding machine to form a composite coil pipe;
6) and annealing the composite coil pipe through a continuous annealing furnace, and packaging and warehousing after detection.
Further, the external diameter size of the iron white copper hollow ingot at the casting position in the step 1): phi 80-120mm, inner diameter: phi is 50-70 mm; the external diameter of the red copper hollow ingot at the casting position is as follows: 40-70mm, inner diameter: phi is 20-50 mm;
further, adopting HSCuNi cupronickel welding wires to weld along the gaps on the periphery of the end face of the groove in the step 2);
further, in the step 3), the rolled red copper is curled into a composite coil pipe with the outer diameter less than or equal to phi 3000mm on line;
further, in step 5), when a straight pipe finished product is required, the specific operations are as follows: drawing the composite coil pipe with the reduced diameter and the reduced wall to the corresponding size on line on a cam drawing and sizing unit to the required size, and simultaneously carrying out finishing processes of online cleaning, flaw detection, rough sizing, fine sizing and deburring at two ends;
further, the LWC coil finished product is needed, and in the step 5), the specific operation is as follows: carrying out online cleaning, flaw detection and rewinding and refining on the composite coil pipe on a double-reel rewinding machine to obtain a rewinding finishing LWC composite coil pipe with corresponding inner diameter and outer diameter of the coil;
in step 6), the LWC coil is annealed in a well annealing furnace.
Compared with the prior art, the invention has the following advantages:
the composite pipe has good corrosion resistance of the outer surface and good heat exchange performance of the inner surface, and can not generate the phenomena of separation and falling of a welding layer and the like in the processing or testing of coil drawing, reducing diameter and reducing wall, bending and flattening, expanding pipe and flaring and the like, thereby increasing the heat exchange effect and reducing the manufacturing cost.
Drawings
FIG. 1 is a schematic diagram of beveling the periphery of the end faces of the outer layers of BFe30-1-1 and T2 in step 2.
Fig. 2 is a schematic view of the rolls of the rolling mill of the present invention.
Detailed Description
Example 1
Finished gauge outside diameter wall thickness length = phi 16 x 1.5 x 6000mm, requiring wall thickness of BFe30-1-1 of 1.15 ± 0.05 mm.
The invention aims to overcome the defects and provides a production technology of an iron white copper and red copper composite pipe, and according to the technical scheme provided by the invention, in the embodiment, the iron white copper is BFe30-1-1, and the red copper is T2.
The method comprises the following steps:
1) respectively casting BFe30-1-1 with the outer diameter phi 102 and the inner diameter phi 60mm and T2 hollow ingots with the outer diameter phi 60 and the inner diameter phi 38mm on an XB-450/150 type horizontal continuous casting furnace, wherein the lengths of the hollow ingots are 15 meters; the chemical components are proportioned according to the corresponding trade mark of GB 5231;
2) respectively milling the outer surfaces of the hollow ingots to enable the outer diameter of T2 to be 58.5mm and the outer diameter of BFe30-1-1 to be 100mm, sleeving the T2 hollow ingot in the BFe30-1-1 hollow ingot, aligning and welding the two hollow ingots to one end surface, respectively drilling 45-degree grooves on the peripheries of the end surfaces of the inner layer of BFe30-1-1 and the outer layer of T2, welding along the gaps on the peripheries of the end surfaces of the grooves by adopting an HSCuNi white copper welding wire, and using argon for protection to prevent oxidation during welding. An oblique groove with the thickness of 10mm is formed at 15 degrees on the BFe30-1-1 according to the scheme shown in figure 1 so as to be beneficial to the biting of an initial roller for rolling;
3) sleeving and welding an outer layer BFe30-1-1 and an inner layer T2 hollow ingot, hot rolling on a JB-XG115 type three-roller planetary rolling mill, utilizing the rolling mill (figure 2), wherein, the position I is a groove of a roller, the special roller rotates at high speed to rub the cast ingot, and simultaneously the roller presses down the cast ingot with large deformation amount, so that the roller and the cast ingot generate a large amount of heat energy instantly, the rotating speed N1 of a main machine is set to be 1500 +/-50 rpm, the feeding angle is 7.65 +/-0.05 degrees, the rolling current is 480 +/-20A, the current during biting is about 800A, the spraying roller-cold water is 3200 +/-100L/h, the temperature of the cast ingot at the outer layer BFe30-1-1 and the cast ingot at the inner layer T2 reaches 800 +/-30 ℃, and the recrystallization temperature is completely reached above, meanwhile, the two are tightly compounded at the joint interval, intermetallic molecules of copper and nickel in BFe30-1-1 of the composite layer and copper of T2 are mutually infiltrated, and the copper and the nickel immediately enter secondary cooling to generate a compact welding layer after rolling; after rolling, phi is 48 multiplied by 2.5, the thread pitch is 35 +/-3 mm/3 strips, and pure nitrogen with the purity of more than or equal to 99.95 percent is used as protective gas to prevent the oxidation of the pipe during rolling. The composite product of the outer layer BFe30-1-1 and the inner layer T2 has good comprehensive performance, high strength and strong separation resistance, provides powerful guarantee for thick-path processing, and does not have the phenomena of separation and falling of a welding layer in processing or testing such as disc-drawing reducing and wall-reducing, bending flattening, expanding tube flaring and the like. The rolled composite pipe is curled into a composite coil pipe with the outer diameter less than or equal to phi 3000mm on line;
4) reducing the diameter and the wall of the composite coil pipe on an XR-DL2200A high-speed coil drawing machine, wherein each coil drawing process comprises the following steps: phi 38 x 2.2-phi 30 x 2-phi 25 x 1.75-phi 20 x 1.6 mm. The inner molds of the outer coiling mold are all moving molds, the material is hard alloy YG8, the lubricating oil of the outer mold is 300#, the lubricating oil of the inner mold is 2500#, and the coiling speed is controlled at 500-800 m/min;
5) drawing the composite coil pipe with the diameter and the wall reduced to phi 20 x 1.6mm to phi 16 x 1.5mm on line on a JB-SCR90 cam drawing sizing machine set, and simultaneously carrying out finishing processes such as online cleaning, flaw detection, rough sizing, fine sizing to 6000mm, deburring at two ends and the like; the inner molds of the outer molds are all moving molds, the material of the inner molds is hard alloy YG8, the lubricating oil of the inner molds of the outer molds is all 300#, and the speed is controlled to be 50-80 m/min;
6) and (3) conveying the composite tube with the diameter of 16 x 1.5 x 6000mm to a roller-bottom type continuous annealing furnace for annealing at the annealing temperature of 720 +/-10 ℃ at the speed of 32HZ, using hydrogen-nitrogen mixed gas containing 25% of hydrogen as protective gas, and packaging and warehousing after detection.
The composite pipe has good corrosion resistance of the outer surface and good heat exchange performance of the inner surface, and can not generate the phenomena of separation and falling of a welding layer and the like in the processing or testing of coil drawing, reducing diameter and reducing wall, bending and flattening, expanding pipe and flaring and the like, thereby increasing the heat exchange effect and reducing the manufacturing cost.
Example 2
Finished gauge outside diameter wall thickness length = phi 12.7 x 1.25mm LWC, requiring wall thickness of BFe30-1-1 to be 0.95 ± 0.05 mm.
The production technology of the BFe30-1-1 and T2 composite tube comprises the following steps according to the technical scheme provided by the invention:
1) respectively casting BFe30-1-1 with the outer diameter phi 98 x and the inner diameter phi 60mm and T2 hollow ingots with the outer diameter phi 60 x and the inner diameter phi 41mm on an XB-450/150 type horizontal continuous casting furnace, wherein the lengths of the hollow ingots are 20 meters; the chemical components are proportioned according to the corresponding trade mark of GB 5231;
2) respectively milling the outer surfaces of the hollow ingots to enable the outer diameter of T2 to be 58.5mm and the outer diameter of BFe30-1-1 to be 96mm, sleeving the T2 hollow ingot in the BFe30-1-1 hollow ingot, aligning and welding the two hollow ingots to one end surface, respectively drilling 45-degree grooves beta on the peripheries of the end surfaces of the inner layer of BFe30-1-1 and the outer layer of T2, welding along the gaps on the peripheries of the end surfaces of the grooves by adopting HSCuNi white copper welding wires, and using argon for protection to prevent oxidation during welding. BFe30-1-1 is beaten into a slope mouth with alpha of 15 degrees and thickness d of 10mm according to the figure 1 to facilitate the initial roller biting for rolling;
3) sleeving and welding the outer layer BFe30-1-1 and the inner layer T2 hollow ingot, hot rolling on a JB-XG115 type three-roller planetary rolling mill, utilizing the rolling mill (as shown in figure 2), wherein, the position I is a groove of a roller, the special roller rotates at high speed to rub the ingot, simultaneously the roller presses the ingot under large deformation amount to ensure that the roller and the ingot instantaneously generate a large amount of heat energy, the rotating speed N1 of a main machine is set to 1480 +/-50 rpm, the feeding angle is 7.65 +/-0.05 degrees, the rolling current is 470 +/-20A, the current during biting is about 800A, the roller is sprayed with cold water of 3100 +/-100L/h to ensure that the temperature of the outer layer BFe30-1-1 and the inner layer T2 ingot reaches 800 +/-30 ℃, the recrystallization temperature is completely reached above, meanwhile, the two are tightly compounded at the joint interval, intermetallic molecules of copper and nickel in BFe30-1-1 of the composite layer and copper of T2 are mutually infiltrated, and the copper and the nickel immediately enter secondary cooling to generate a compact welding layer after rolling; after rolling, phi is 48 multiplied by 2.35, the thread pitch is 35 +/-3 mm/3 strips, and pure nitrogen with the purity of more than or equal to 99.95 percent is used as protective gas to prevent the oxidation of the pipe during rolling. The composite product of the outer layer BFe30-1-1 and the inner layer T2 has good comprehensive performance, high strength and strong separation resistance, provides powerful guarantee for thick-path processing, and does not have the phenomena of separation and falling of a welding layer in processing or testing such as disc-drawing reducing and wall-reducing, bending flattening, expanding tube flaring and the like. The rolled composite pipe is curled into a composite coil pipe with the outer diameter less than or equal to phi 3000mm on line;
4) reducing the diameter and the wall of the composite coil pipe on an XR-DL2200A high-speed coil drawing machine, wherein each coil drawing process comprises the following steps: phi 38 x 2.15-phi 30 x 2-phi 25 x 1.75-phi 20 x 1.55-phi 16 x 1.35-phi 12.7 x 1.25 mm. The inner molds of the outer coiling mold are all moving molds, the material is hard alloy YG8, the lubricating oil of the outer mold is 300#, the lubricating oil of the inner mold is 2500#, and the coiling speed is controlled at 500-800 m/min;
5) carrying out online cleaning, flaw detection and rewinding and finishing on the phi 12.7X 1.25mm composite coil pipe on a DHLW6006S-08G double-reel rewinding machine to obtain a rewinding and finishing LWC composite coil pipe with the coil inner diameter phi 610 +/-5 mm, the coil outer diameter phi 1230mm and the coil width 230 +/-10 mm, wherein the weight of the coil pipe is controlled at 100 + 150kg, and the rewinding speed is 300 m/min;
6) and cleaning the inner wall of the phi 12.7 x 1.25mm rewinding finishing LWC composite coil disc by disc, sucking a hydrocarbon cleaning agent by using a dry sponge during cleaning, plugging the hydrocarbon cleaning agent into the inner hole of the coil, and blowing the sponge out by using dry high-pressure air to ensure that the inner wall of the pipe is clean. And (3) conveying the mixture to a well type annealing furnace for annealing, wherein the annealing temperature is 720 +/-10 ℃, the heat preservation time is 90 minutes, and the hydrogen-nitrogen mixed gas containing 12% of hydrogen is used as protective gas, and the mixture is packaged and stored in a warehouse after detection.
The composite pipe has good corrosion resistance of the outer surface and good heat exchange performance of the inner surface, and can not generate the phenomena of separation and falling of a welding layer and the like in the processing or testing of coil drawing, reducing diameter and reducing wall, bending and flattening, expanding pipe and flaring and the like, thereby increasing the heat exchange effect and reducing the manufacturing cost.
Claims (6)
1. A production process of an iron-white-copper and red-copper composite pipe is characterized by comprising the following steps:
1) casting iron white copper hollow ingots and red copper hollow ingots on a horizontal continuous casting furnace;
2) respectively milling the outer surfaces of the iron white copper and the red copper hollow cast ingot to enable the outer diameter of the red copper hollow cast ingot to be 0.5-3mm smaller than the inner diameter of the iron white copper hollow cast ingot, sleeving the red copper hollow cast ingot in the iron white copper hollow cast ingot, and aligning and welding the two end faces;
3) sleeving welded outer-layer iron white copper and inner-layer red copper hollow cast ingots, carrying out hot rolling on the cast ingots by a three-roller planetary rolling mill, cooling to generate a compact welded layer, and coiling the rolled red copper on line to form a composite coil pipe;
4) reducing the diameter of the composite coil pipe on a high-speed coil drawing machine, and reducing the wall thickness of the composite coil pipe to the required outer diameter wall thickness;
5) drawing the composite coil pipe subjected to diameter reduction in the step 4) to a required size on a cam drawing and sizing unit on line, and simultaneously performing a finishing process; or on-line cleaning, flaw detection and rewinding and refining on a double-drum rewinding machine to form a composite coil pipe;
6) and annealing the composite coil pipe through a continuous annealing furnace, and packaging and warehousing after detection.
2. The production process of the iron white copper and red copper composite pipe according to claim 1, wherein the external diameter of the iron white copper hollow ingot cast in the step 1) is as follows: phi 80-120mm, inner diameter: phi is 50-70 mm;
the external diameter size of the red copper hollow ingot at the casting position is as follows: 40-70mm, inner diameter: phi is 20-50 mm.
3. The production process of the iron white copper and red copper composite pipe according to claim 1, wherein in the step 2), an HSCuNi white copper welding wire is adopted to weld along the circumferential gaps of the end surface of the groove.
4. The production process of the iron white copper and red copper composite pipe according to claim 1, wherein in the step 3), the rolled red copper is curled into a composite coil pipe with the outer diameter less than or equal to phi 3000mm on line.
5. The production process of the iron white copper and red copper composite pipe according to claim 1, characterized in that in step 5), when a straight pipe finished product is required, the specific operations are as follows: the composite coil pipe which is reduced in diameter and wall to the corresponding size is placed on a cam drawing sizing unit; drawing to the required size on line, and simultaneously carrying out finishing processes of on-line cleaning, flaw detection, rough sizing, fine sizing and deburring at two ends.
6. The production process of the iron white copper and red copper composite pipe according to claim 1, wherein the finished LWC coil pipe is required,
in step 5), the specific operations are as follows: carrying out online cleaning, flaw detection and rewinding and refining on the composite coil pipe on a double-reel rewinding machine to obtain a rewinding finishing LWC composite coil pipe with corresponding inner diameter and outer diameter of the coil;
in step 6), the LWC coil is annealed in a well annealing furnace.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010783573.1A CN111889985A (en) | 2020-08-06 | 2020-08-06 | Production process of iron white copper and red copper composite pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010783573.1A CN111889985A (en) | 2020-08-06 | 2020-08-06 | Production process of iron white copper and red copper composite pipe |
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| CN111889985A true CN111889985A (en) | 2020-11-06 |
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| CN202010783573.1A Withdrawn CN111889985A (en) | 2020-08-06 | 2020-08-06 | Production process of iron white copper and red copper composite pipe |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203391A (en) * | 2013-01-06 | 2013-07-17 | 金龙精密铜管集团股份有限公司 | Production method for copper-titanium composite tube |
| CN105043139A (en) * | 2015-08-29 | 2015-11-11 | 哈尔滨精方电力设备科技有限公司 | Compound anti-burst cooling tube and manufacturing process thereof |
-
2020
- 2020-08-06 CN CN202010783573.1A patent/CN111889985A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203391A (en) * | 2013-01-06 | 2013-07-17 | 金龙精密铜管集团股份有限公司 | Production method for copper-titanium composite tube |
| CN105043139A (en) * | 2015-08-29 | 2015-11-11 | 哈尔滨精方电力设备科技有限公司 | Compound anti-burst cooling tube and manufacturing process thereof |
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Application publication date: 20201106 |