WO2011077650A1 - 冷間引抜用素管およびその製造方法並びに冷間引抜管の製造方法 - Google Patents
冷間引抜用素管およびその製造方法並びに冷間引抜管の製造方法 Download PDFInfo
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- WO2011077650A1 WO2011077650A1 PCT/JP2010/007129 JP2010007129W WO2011077650A1 WO 2011077650 A1 WO2011077650 A1 WO 2011077650A1 JP 2010007129 W JP2010007129 W JP 2010007129W WO 2011077650 A1 WO2011077650 A1 WO 2011077650A1
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- Prior art keywords
- tube
- cold
- raw
- surface roughness
- manufacturing
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- 238000010622 cold drawing Methods 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 230000003746 surface roughness Effects 0.000 claims abstract description 67
- 238000000034 method Methods 0.000 claims abstract description 62
- 238000012546 transfer Methods 0.000 claims abstract description 19
- 238000005461 lubrication Methods 0.000 claims description 31
- 238000005422 blasting Methods 0.000 claims description 20
- 238000005554 pickling Methods 0.000 claims description 20
- 238000011282 treatment Methods 0.000 claims description 20
- 238000010248 power generation Methods 0.000 claims description 17
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 10
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 9
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 9
- 229910001566 austenite Inorganic materials 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 23
- 239000000956 alloy Substances 0.000 abstract description 23
- 238000012360 testing method Methods 0.000 description 17
- 239000010687 lubricating oil Substances 0.000 description 16
- 239000003921 oil Substances 0.000 description 14
- 239000000126 substance Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 8
- 239000011651 chromium Substances 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000007654 immersion Methods 0.000 description 5
- 229910001026 inconel Inorganic materials 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 244000145845 chattering Species 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
- B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels
-
- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
-
- 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
- B21C9/00—Cooling, heating or lubricating drawing material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C11/00—Selection of abrasive materials or additives for abrasive blasts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
- B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/45—Scale remover or preventor
- Y10T29/4506—Scale remover or preventor for hollow workpiece
- Y10T29/4511—Interior surface
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12292—Workpiece with longitudinal passageway or stopweld material [e.g., for tubular stock, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12993—Surface feature [e.g., rough, mirror]
Definitions
- the present invention relates to an element tube for cold drawing, a method for producing the element tube, and a method for producing a cold drawn pipe.
- it is a cold drawing element tube used for manufacturing a steam generator heat transfer tube or the like in a nuclear power generation facility, and the cold drawing element tube that does not generate seizure or chatter vibration in the cold drawing process, and the cold drawing element tube.
- the present invention relates to a method for manufacturing a thin pipe for thinning, and a method for manufacturing a cold drawn pipe obtained by cold drawing the raw pipe.
- Steam generator heat transfer tube A small-diameter long heat transfer tube used for steam generators in nuclear power generation facilities.
- SG steam generator heat transfer tube for nuclear power generation
- High-pressure lubrication drawing method After inserting the mother pipe into the high-pressure vessel and filling the high-pressure vessel with the lubricating oil, the pressure of the lubricating oil is increased to, for example, 40 Mpa or more with a pressure intensifier, and the inner and outer surfaces of this pipe are forcibly lubricated. This is a processing method for drawing a tube.
- “Baking” A phenomenon in which friction is rapidly increased by contact between a workpiece and a tool (die, plug) due to poor lubrication of the inner surface of the workpiece, resulting in severe welding and roughening of the surface.
- “Chattering vibration” Self-excited vibration caused by fluctuation of a friction coefficient generated between a workpiece and a tool (die, plug), and is a stick-slip phenomenon in which a stick state and a slip state are repeated.
- “Raw tube inner surface roughness Ra” means the inner surface roughness of the tube expressed by the average surface roughness Ra defined in ANSI B46.1.
- heat transfer tubes used by being incorporated in steam generators in nuclear power generation facilities and heat exchanger tubes incorporated in heat exchangers such as water heaters of various devices have a small diameter of 40 mm or less and a length of 15 m or more. It is manufactured as a long tube.
- Such a small-diameter long tube is usually made of a seamless tube manufactured by a hot manufacturing method using a Eugene Sejurne type pipe making equipment, and after subjecting it to a bright heat treatment in a reducing atmosphere, Manufactured by thinning.
- a high-pressure lubrication drawing method (high-pressure drawing method) has been developed that has a great effect on improving the quality of drawn tubes.
- This method is a tube processing method in which a high-pressure vessel filled with a raw tube is filled with lubricating oil, and the raw tube is pulled out of the high-pressure vessel while performing drawing while supplying high-pressure lubricating oil. .
- FIG. 1 is a diagram for explaining a high-pressure lubrication drawing method in which a drawing process is performed while supplying a high-pressure lubricating oil.
- the cylindrical container 4 whose one end is closed and whose open end is the telescopic structure 4a is used with the closed end side as a fulcrum.
- the open end side is provided so as to be swingable so that the position is variable between the extraction pass line and the blank tube insertion line.
- a plug support rod 5 for holding the plug 1 is disposed through the plug 1 in a die 2 fixedly arranged on the drawing pass line.
- the container 4 is supplied and filled with high-pressure lubricating oil by the pump P, and the raw tube 3 is drawn out of the annular space from the vessel 4 to finish a drawn tube of a predetermined size.
- the high pressure lubricating oil supplied and filled in the container 4 is continuously supplied to the inner and outer surfaces of the raw tube 3.
- the airtight maintenance between the open end in the container 4 and the die 2 is such that the telescopic structure 4a provided on the open end side in the container 4 is pushed to the left in the figure by high-pressure lubricant. This is done automatically when the tip is pressed against the entrance surface of the die 2. Further, the airtightness between the plug 1 and the die 2 is maintained by the raw tube 3 during the drawing process.
- Patent Document 1 discloses a drawing method in which a bright heat treatment is performed in a hydrogen atmosphere having a dew point of ⁇ 50 ° C. or less on a workpiece before drawing in order to prevent chatter vibration generated in the workpiece.
- a bright heat treatment is performed in a hydrogen atmosphere having a dew point of ⁇ 50 ° C. or less on a workpiece before drawing in order to prevent chatter vibration generated in the workpiece.
- chromium oxide (Cr 2 O 3 ), alumina oxide (Al 2 O 3 ), etc. during heat treatment, the fluctuation of the friction coefficient between the blank tube and the tool during drawing is suppressed, and chatter vibration is suppressed. It can be prevented.
- Patent Document 2 discloses a plug used for drawing of a workpiece (lubricated heat-treated raw material) that has been subjected to a lubrication treatment, and a surface roughness Rmax of a portion that contacts the workpiece is set to 0.4.
- a plug having a diameter of ⁇ 2.0 ⁇ m and a method for producing a drawn steel pipe using this plug are described.
- the metal oxide is trapped in the minute recesses present on the plug surface, and the metal oxide fines overflowing from it cuts the lubricating oil film, increasing the frictional resistance and generating chatter vibration. It is said that chatter vibration can be prevented from occurring by appropriately adjusting the roughness and securing an oil pit having a sufficient capacity to collect lubricating oil.
- Patent Documents 1 and 2 are effective methods for preventing chatter vibration.
- these conventional technologies alone are not always perfect, and local seizure or chatter vibration may occur depending on the condition of the inner surface of the raw material tube, the state of oil lubrication film formation, the drawing conditions, etc. There is.
- An object of the present invention is to provide a cold drawing element tube used for oil lubrication drawing processing in which an oil lubrication film is formed on the surface of the element tube, in particular, an SG pipe used for a steam generator of a nuclear power generation facility, and the like.
- An object of the present invention is to provide a cold drawing element tube that is used for manufacturing a heat transfer tube, and that does not generate seizure or chatter vibration in the drawing process.
- Another object of the present invention is to provide a method for manufacturing a cold drawing blank according to the present invention.
- Cold drawing produced by using the cold drawing tube according to any one of (1) to (4) or produced by the method according to any of (5) to (7) A method for producing a cold drawn tube, characterized in that cold drawing is performed using an element tube.
- the inner surface roughness of the element tube before drawing can be appropriately adjusted to obtain the drawing element tube of the present invention.
- FIG. 1 is a diagram for explaining a high-pressure lubrication drawing method in which a drawing process is performed while supplying a high-pressure lubricating oil.
- FIGS. 2A and 2B are diagrams for explaining the state of occurrence of seizure in high-pressure lubrication drawing.
- FIG. 2A shows a case where the inner surface roughness before drawing is large
- FIG. 2B shows a case where the inner surface roughness is small. .
- the cold drawing raw tube of the present invention is based on the premise that the raw tube inner surface roughness before drawing is ANSI based on the premise that it is a drawing raw tube used for drawing to form an oil lubrication film on the surface of the workpiece.
- the element tube When expressed by the average surface roughness Ra specified in B46.1, the element tube satisfies the following expression (i). 0.10 ⁇ m ⁇ Ra ⁇ 1.00 ⁇ m (i)
- the reason why the inner surface roughness Ra before drawing satisfies the above formula (i) is to prevent seizure and chatter vibration during drawing.
- the raw tube inner surface roughness Ra before drawing is less than 0.10 ⁇ m, chatter vibration occurs during drawing. Since the inner surface of the tube is smooth, the friction coefficient at the contact surface between the tool and the tube decreases, but on the other hand, it becomes difficult for lubricant to enter between the material and the tool (die, plug), and the coefficient of friction changes. This is because it tends to occur.
- FIGS. 2A and 2B are diagrams for explaining the state of occurrence of seizure in high-pressure lubrication drawing.
- FIG. 2A shows a case where the inner surface roughness before drawing is large
- FIG. 2B shows a case where the inner surface roughness is small.
- the outer diameter of the workpiece (raw tube) 3 is reduced by a die (not shown), and the portion where the inner surface is in contact with the plug is shown enlarged.
- a white arrow in the figure indicates a direction in which the raw tube 3 is pulled out.
- an oil film 6 is formed on the surface of the plug 1 by high-pressure lubricating oil that is forcibly introduced between the tool and the raw pipe.
- FIG. 2 (b) when the inner surface roughness of the tube 3 is small, there is no portion protruding on the surface of the tube 3, and the entire material is pressed against the surface of the plug 1 by a die. There is no direct contact with the plug 1.
- the cold drawing element pipe of the present invention is a drawing element pipe used for both normal oil-lubricated drawing and high-pressure lubrication drawing processes, and the drawing element pipe is used for high-pressure lubrication drawing. It is desirable to adopt the embodiment. If the high-pressure lubrication drawing method is applied, as described above, the lubricating oil is supplied and filled at a high pressure between the base tube and the tool, so that no oil runs out during the drawing process.
- the element pipe is an austenitic alloy element tube used for a steam generator heat transfer tube.
- the steam generator heat transfer tube means a small-diameter long tube such as an SG tube used in a steam generator in a nuclear power generation facility or a heat transfer tube incorporated in a heat exchanger such as a water heater.
- the chemical composition of the austenitic alloy tube of the present invention is, for example, in mass%, C: 0.15% or less, Si: 1.00% or less, Mn: 2.0% or less, P: 0.030. %: S: 0.030% or less, Cr: 10.0-40.0%, Ni: 8.0-80.0%, Ti: 0.5% or less, Cu: 0.6% or less, Al : 0.5% or less and N: 0.20% or less, with the balance being Fe and impurities.
- the typical compositions of the Ni-based alloy used in the SG tube are the following two types (a) and (b).
- Ni-based alloy (30% Cr-9% Fe-60% Ni) defined by ASME SB-163 UNS N06690 has Cr of 14.0 to 17.0 mass% and Ni of 70 to 80 mass% Therefore, it is an alloy having excellent corrosion resistance in an environment containing chloride. More specific chemical composition is mass%, C: 0.15% or less, Si: 1.00% or less, Mn: 2.0% or less, P: 0.030% or less, S: 0.030% Hereinafter, Cr: 14.0 to 17.0%, Fe: 6.0 to 10.0%, Ti: 0.5% or less, Cu: 0.6% or less, and Al: 0.5% or less A composition in which the balance is made of Ni and impurities is mentioned.
- the inner surface roughness of the element tube is an average defined by ANSI B46.1.
- the surface roughness Ra if it satisfies the following formula (ii), chatter vibration and seizure, for example, even a slight seizure that does not affect the quality can be prevented, which is desirable. . 0.10 ⁇ m ⁇ Ra ⁇ 0.50 ⁇ m (ii)
- the upper limit of the average surface roughness Ra is set to 0.50 ⁇ m.
- the upper limit of the inner surface roughness Ra is defined as 0.50 ⁇ m.
- the manufacturing method of the cold drawing element pipe of the present invention is the manufacturing method of the cold drawing element pipe of the present invention described above, and is defined in the ISO 8486 1996 F standard on the inner surface of the original pipe before drawing.
- the method is characterized in that blasting is performed using 100th to # 350th blast grains.
- the cold-drawing element tube of the present invention particularly the cold-drawing element tube used for producing the heat transfer tube (for example, SG tube) for the steam generator in the nuclear power generation facility, is usually a Eugene Sejurne type pipe-making facility.
- a drawing pipe having an outer diameter and a wall thickness that can be cold drawn by performing cold rolling after using a seamless pipe produced by a hot production method using It is manufactured by doing.
- the cold drawing raw tube thus obtained is subjected to drawing by a high-pressure lubrication drawing method to produce a heat transfer tube for a steam generator such as an SG tube.
- the inner surface roughness of the cold-drawn raw tube subjected to the cold rolling described above varies depending on the wear condition of the rolling roll and the setting conditions of the mandrel, roll, etc. Even if lubrication is performed, local seizure or chatter vibration may occur.
- the inner surface roughness of the element pipe is adjusted by blasting the inner surface of the element pipe before drawing.
- the blast grain is defined by the ISO standard and expressed by a count.
- the ratio of the particle size contained in each blast grain is determined, and the roughness of the inner surface of the tube can be adjusted to a certain roughness range depending on the blast grain number used.
- the roughness Ra of the inner surface of the tube is calculated by the above formula (i) It is possible to manufacture a drawing tube that satisfies the above requirements.
- blast particles those usually used such as alumina particles may be used.
- Zirconium oxide grains are desirable when a high-alloy base tube such as a Ni-based alloy is the object of processing.
- zirconium oxide grains are supposed to be used when blasting an SG tube manufacturing tube used in nuclear power generation equipment. Furthermore, since the upper limit of the inner surface roughness Ra of the SG tube is defined as 0.50 ⁇ m, the upper limit of the inner surface roughness Ra of the elementary tube is 0.50 ⁇ m when the raw tube for SG tube production is targeted. It is desirable to perform blasting using such zirconium oxide grains.
- blast particles made of zirconium oxide # 200- # 350 as defined in ISO 8486 1996 F standard are formed on the inner surface of the raw tube before drawing. It is desirable to adopt an embodiment in which the blasting process is performed. By adopting this method, as shown in Table 2 of Example 2 which will be described later, the raw tube inner surface roughness Ra can be surely made 0.50 ⁇ m or less.
- the blast treatment is carried out in accordance with a conventional method, for example, by using an air-type injector and blowing blast particles with an air pressure of 0.29 to 0.49 MPa (3 to 5 kgf / cm 2 ) and an injection time of 3 to 10 minutes. Good.
- Another method for manufacturing the cold drawing element tube of the present invention is the aforementioned method for manufacturing a cold drawing element tube according to the present invention, in which the inner surface of the element tube before drawing is pickled with hydrofluoric acid.
- the inner surface roughness of the raw tube is adjusted so as to satisfy the formula (i) or the formula (ii).
- the reason why the pickling treatment is performed on the inner surface of the raw pipe before drawing is to make the inner surface roughness Ra of the raw pipe satisfy the formula (i) or (ii).
- the pickling treatment with hydrofluoric acid is performed on the inner surface of the raw tube, the grain boundaries on the surface are roughened. Therefore, this method can be applied to a raw tube having an inner surface roughness Ra of less than 0.10 ⁇ m.
- a simple method is to immerse the raw tube in the pickling solution. It is desirable that the concentration of hydrofluoric acid (HF) in the pickling solution is 2 to 5%, and the concentration of nitric acid (HNO 3 ) is 5 to 10%. If the acid concentration is within this range, the treatment can proceed at an appropriate rate near room temperature.
- the treatment temperature is preferably 30 to 50 ° C.
- the immersion time is determined in advance according to the material of the raw tube, the concentration and temperature of the pickling solution, and the time required for the inner surface roughness Ra to satisfy the above formula (i) or (ii). Then, it may be determined appropriately based on that.
- the inner surface roughness of the element tube before drawing can be appropriately adjusted to manufacture the cold drawing element tube of the present invention. Furthermore, according to the manufacturing method of the cold drawn pipe of the present invention, the obtained cold drawn raw pipe of the present invention is subjected to drawing processing, so that it is optimal for the production of a heat transfer pipe for a steam generator in a nuclear power generation facility. is there.
- Example 1 Various types of inner surface roughness Ra are targeted for a Ni-based alloy (Inconel alloy: 30% Cr, 9% Fe, 60% Ni) having an outer diameter of 25.0 mm, a wall thickness of 1.65 mm and a length of 11400 mm.
- a blank tube was prepared.
- the inner surface roughness Ra of the raw tube was varied by subjecting the raw tube before drawing to blasting.
- SV-3100S4 manufactured by Mitutoyo was used for measuring the roughness of the inner surface of the tube.
- a small-diameter long tube (hereinafter referred to as a drawing) having a lubricating oil pressure of 120 Mpa, an outer diameter of 19.14 mm, a wall thickness of 1.14 mm and a length of 21700 mm by the high-pressure lubricating drawing method shown in FIG. (Referred to as a tube).
- chatter vibration an internal eddy current flaw detection test was performed to determine whether or not it occurred, and an S / N ratio ⁇ 20 was used as a criterion for chatter vibration generation.
- the seizure was limited to seizure on the inner surface, and the presence or absence of occurrence was determined by visual comparison with a seizure sample.
- 3 to 13 corresponding to the examples of the present invention
- chatter vibration and seizure affecting the quality did not occur.
- the raw tube inner surface roughness Ra before drawing is 0.10 to 0.50 ⁇ m (test Nos. 3 to 9)
- not only chatter vibration but also slight seizure does not occur, and a tube with better quality is obtained. It was.
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Abstract
Description
「蒸気発生器用伝熱管」:原子力発電設備における蒸気発生器等に用いられる小径長尺の伝熱管を指す。特に、原子力発電用の蒸気発生器用伝熱管を、ここでは、SG(steam generator)管と記す。
「高圧潤滑引抜法」:高圧容器に母管を挿入し、高圧容器に潤滑油を充満させた後、増圧機により潤滑油を例えば40Mpa以上に昇圧して、この管内外面を強制潤滑した状態で管を引き抜く加工方法である。
「焼き付き」:被加工材の内面の潤滑不良に起因して、被加工材と工具(ダイス、プラグ)との接触により摩擦が急激に増大し、激しい溶着が生じて面が荒れる現象である。
「びびり振動」:被加工材と工具(ダイス、プラグ)との間に生じる摩擦係数の変動に起因した自励振動であり、スティック状態とスリップ状態を繰り返すスティックスリップ現象である。
「素管内面粗さRa」:ANSI B46.1に規定される平均表面粗さRaで表した素管内面粗さを意味する。
(1)被加工材の表面に油潤滑皮膜を形成する引抜加工に用いられる冷間引抜用素管であって、引抜前の素管内面粗さが、ANSI B46.1に規定される平均表面粗さRaで表したとき、下記(i)式を満たすことを特徴とする冷間引抜用素管。
0.10μm≦Ra≦1.00μm ・・・(i)
0.10μm≦Ra≦0.50μm ・・・(ii)
0.10μm≦Ra≦1.00μm ・・・(i)
0.10μm≦Ra≦0.50μm ・・・(ii)
外径25.0mm、肉厚1.65mmおよび長さ11400mmのNi基合金(インコネル系合金:30%Cr、9%Fe、60%Ni)の素管を対象とし、種々の内面粗さRaを有する素管を準備した。素管の内面粗さRaは、引抜き前の素管にブラスト処理を施して種々に変化させた。管内面の粗さ測定には、ミツトヨ製SV-3100S4を使用した。
◎:びびり振動および焼き付きのいずれも発生しなかったことを示す。
○:びびり振動および焼き付きの発生がないが、品質に影響のない微少な焼き付きが発生したことを示す。
×:びびり振動および焼き付きの一方または両方が発生したことを示す。
実施例1で用いたNi基合金(インコネル系合金)の素管と同じ材質、寸法の素管を対象とし、種々の内面粗さRaを有する素管を準備した。これらの素管に対して、番手の異なるブラスト粒を使用してブラスト処理を行い、処理後の素管内面粗さRaを測定した。管内面の粗さ測定には、ミツトヨ製SV-3100S4を使用した。
◎:びびり振動および焼き付きのいずれも発生しなかったことを示す。
○:びびり振動および焼き付きの発生がないが、品質に影響のない微少な焼き付きが発生したことを示す。
×:びびり振動および焼き付きの一方または両方が発生したことを示す。
[ブラスト後の粗さRa]
番手が#50の酸化ジルコニウム粒を用いてブラスト処理を施した場合(試験No.1~3)、ブラスト後の素管内面粗さRaは1.00μmを超えた。番手が#100、#200、#350と高くなるに伴い、素管内面粗さRaは段階的に減少した。ブラスト処理を、番手が#100~#350の酸化ジルコニウム粒を用いて行った試験No.4~12(本発明例に該当する)では、素管内面粗さRaを本発明で規定する範囲内(前記(i)式を満たす0.10~1.00μm)にすることができた。また、番手が#200~#350の酸化ジルコニウム粒を用いて行った試験No.7~12では、素管内面粗さRaを前記(ii)式を満たす0.10~0.50μmにすることができた。
ブラスト後の素管内面粗さRaが1.00μmを超えた場合(試験No.1~3)には、焼き付きが発生した。ブラスト処理で素管内面粗さRaを0.10~1.00μmとした場合(試験No.4~12)には、びびり振動および品質に影響を及ぼす焼き付きは発生しなかった。特に、ブラスト後の素管内面粗さRaが0.10~0.50μm(試験No.7~12)では、びびり振動だけでなく微少な焼き付きも発生せず、より優れた品質の管が得られた。
実施例1で用いたNi基合金(インコネル系合金)の素管と同じ材質、寸法の素管を対象とし、素管内面の粗さRaが、0.10μm未満の素管を準備した。これらの素管に対して、酸洗処理を行い、処理後の素管内面粗さRa測定した。
◎:びびり振動および焼き付きのいずれも発生しなかったことを示す。
○:びびり振動および焼き付きの発生がないが、品質に影響のない微少な焼き付きが発生したことを示す。
×:びびり振動および焼き付きの一方または両方が発生したことを示す。
[酸洗後の粗さRa]
浸漬時間が20分(試験No.1)では、酸洗が不十分であり、酸洗の前後で素管内面の粗さに顕著な変化はみられなかった。また、浸漬時間が480分および600分(試験No.6および7)では、酸洗が進みすぎ、素管内面の粗さRaは1.00μmを超えた。浸漬時間を60~360分の範囲内とした場合(試験No.2~5で、本発明例に該当する)、素管内面粗さRaを本発明で規定する範囲内にすることができた。すなわち、前記の弗硝酸濃度および温度条件の下では、処理時間を60~360分とすればよい。
酸洗後の素管内面粗さRaが小さい場合(試験No.1)には、工具と素管との摩擦係数が低下し、スリップし易くなりびびり振動が発生した。また、酸洗後の素管内面粗さRaが1.00μmを超えた場合(試験No.6および7)には、焼き付きが発生した。
4:容器、 4a:テレスコピック構造、 5:プラグ支持桿、 6:油膜
Claims (9)
- 被加工材の表面に油潤滑皮膜を形成する引抜加工に用いられる冷間引抜用素管であって、
引抜前の素管内面粗さが、ANSI B46.1に規定される平均表面粗さRaで表したとき、下記(i)式を満たすことを特徴とする冷間引抜用素管。
0.10μm≦Ra≦1.00μm ・・・(i) - 前記冷間引抜用素管が、高圧潤滑引抜に用いられる素管であることを特徴とする請求項1に記載の冷間引抜用素管。
- 前記冷間引抜用素管が、原子力発電用の蒸気発生器用伝熱管に使用されるオーステナイト合金製の素管であることを特徴とする請求項2に記載の冷間引抜用素管。
- 前記素管の内面粗さが、ANSI B46.1に規定される平均表面粗さRaで表したとき、下記(ii)式を満たすことを特徴とする請求項2または3に記載の冷間引抜用素管。
0.10μm≦Ra≦0.50μm ・・・(ii) - 請求項1~4のいずれかに記載の冷間引抜用素管を用いて、冷間引抜加工を行うことを特徴とする冷間引抜管の製造方法。
- 請求項1~4のいずれかに記載の冷間引抜用素管の製造方法であって、
前記引抜前の素管内面に、ISO 8486 1996 F規格に規定される#100番手~#350番手のブラスト粒を用いてブラスト処理を施すことを特徴とする冷間引抜用素管の製造方法。 - 請求項4に記載の冷間引抜用素管の製造方法であって、
前記引抜前の素管内面に、ISO 8486 1996 F規格に規定される#200番手~#350番手の酸化ジルコニウム製のブラスト粒を用いてブラスト処理を施すことを特徴とする冷間引抜用素管の製造方法。 - 請求項1~4のいずれかに記載の冷間引抜用素管の製造方法であって、
前記引抜前の素管内面に、弗硝酸による酸洗処理を施して、前記(i)式または(ii)式を満たすように素管の内面粗さを調整することを特徴とする冷間引抜用素管の製造方法。 - 請求項6~8のいずれかに記載の方法で製造された冷間引抜用素管を用いて、冷間引抜加工を行うことを特徴とする冷間引抜管の製造方法。
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