WO2009081655A1 - 内面リブ付鋼管の製造方法およびそれに用いられる引抜用プラグ - Google Patents
内面リブ付鋼管の製造方法およびそれに用いられる引抜用プラグ Download PDFInfo
- Publication number
- WO2009081655A1 WO2009081655A1 PCT/JP2008/069545 JP2008069545W WO2009081655A1 WO 2009081655 A1 WO2009081655 A1 WO 2009081655A1 JP 2008069545 W JP2008069545 W JP 2008069545W WO 2009081655 A1 WO2009081655 A1 WO 2009081655A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plug
- steel pipe
- forming
- rib
- pipe
- Prior art date
Links
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
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/16—Mandrels; Mounting or adjusting same
-
- 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
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
- B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
- C10M129/26—Carboxylic acids; Salts thereof
- C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
- C10M129/40—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/085—Phosphorus oxides, acids or salts
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/1253—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/20—Metal working
- C10N2040/241—Manufacturing joint-less pipes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/023—Multi-layer lubricant coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2245/00—Coatings; Surface treatments
Definitions
- the present invention relates to a method for manufacturing a steel pipe with an inner rib and a plug for drawing, in which a spiral rib (projection) is formed on the inner surface of a steel pipe by drawing, and more specifically, the helical rib can be stably processed.
- the present invention relates to a method for manufacturing an internally ribbed steel pipe, and a drawing plug used in the manufacturing method.
- a steel pipe (rifle tube) with an inner rib having a spiral rib (protrusion) formed on the inner surface of the steel pipe is used for high-temperature heat-resistant parts such as for boilers and heat exchangers in order to improve power generation efficiency.
- the inner surface of the internally ribbed steel pipe has a larger surface area than the inner rib, so that the contact area between the heated inner surface of the pipe and the water vapor passing through the inside of the pipe is increased, and the fluid containing water vapor is turbulently heated. Increases exchange efficiency.
- seamless steel pipes or ERW steel pipes are manufactured as raw pipes, and if necessary, the raw pipes are sufficiently softened and then applied to the drawing die and outer peripheral surface in a cold process. Drawing is performed using a plug having a spiral groove for rib formation.
- FIG. 1 is a diagram schematically illustrating a method of manufacturing an internally ribbed steel pipe by drawing.
- one end of the plug 1 is held by the mandrel 4 and inserted into the inner surface of the tube 3 concentrically with the die 2 and the tube 3 while rotating the plug 1.
- the base tube 3 is pulled out in the direction of the white arrow.
- the outer surface of the drawn tube 3 is squeezed by the die 2.
- the inner surface of the raw tube 3 is formed along a spiral groove 1a formed on the outer peripheral surface of the plug 1, and a spiral rib 3a is formed on the inner peripheral surface of the raw tube 3 after drawing.
- the plug 1 to be used has a structure in which one end is held by a mandrel 4 and can be freely rotated.
- the plug shape greatly affects the dimensional accuracy of the rib height and rib shape of the steel pipe with internal ribs (especially the rib corner and lead angle).
- seizure occurs between the raw pipe and the plug. May occur.
- a drawing plug in which a spiral groove having a predetermined shape is formed is used for manufacturing an internally ribbed steel pipe.
- FIG. 2 is a view showing a cross-sectional shape of a spiral groove formed in a drawing plug used for manufacturing a steel pipe with an inner rib.
- FIG. 4 is a schematic diagram showing stepwise cross-sectional shapes orthogonal to the plug axis of the spiral groove shown in FIG. 1, wherein (a) is a cross-sectional view taken along the line AA in FIG. 1 shows a cross section taken along line BB in FIG. 1, and FIG. 1C shows a cross section taken along line CC in FIG.
- the drawing plug of the steel pipe with an inner rib has a radius of curvature r at a portion where the opposite side walls 1aa and the bottom face 1ab intersect as side walls of a plurality of spiral grooves 1a formed on the outer peripheral surface thereof as shown in FIG. ) Is configured so as to increase gradually on the front end side of the plug and gradually decrease toward the rear end side as shown in FIGS. 2 (c) and 2 (b).
- FIG. 3 is a diagram showing a cross-sectional shape of a spiral groove formed in a drawing plug used for manufacturing an internally ribbed steel pipe according to another embodiment. 2A and 3B, the cross-sectional shape perpendicular to the plug axis of the spiral groove is shown in FIG. 3A.
- FIG. 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. The section taken along the arrow and FIG. 3C are shown stepwise as the section taken along the line CC in FIG.
- the pull-out plug shown in FIG. 3 has a radius of curvature r at a portion where the opposite side walls 1aa and the bottom surface 1ab intersect with each other by forming a plurality of spiral grooves 1a formed on the outer peripheral surface. It is configured to keep constant until reaching the part side, and to reduce the diameter with a gradient of 3 °, for example, from the front end part side to the rear end part side of the plug. This also makes it difficult for seizure to occur because the rib forming on the inner surface of the tube is performed stepwise at a constant deformation rate (see Japanese Patent Application Laid-Open No. 2001-179327).
- the cross-sectional shape of the drawing plug is not shown, as shown in FIGS. 2 and 3, in addition to changing the cross-sectional shape of the spiral groove formed in the drawing plug in a stepwise manner, In order to reduce the contact area between the groove groove and the inner surface of the tube and reduce the frictional resistance between the top of the groove and the tube, the groove edge of the spiral groove is chamfered in a curved or straight line. There are also cases in which a drawing plug with a mark is used (see Japanese Patent Application Laid-Open No. 2006-272392).
- the standard applied to the internally ribbed steel pipe is JIS G 3461 (STB) and JIS G 3462 (STBA), so carbon steel or Cr-based low alloy steel is assigned as the material steel type.
- sulfuric acid washing is used for descaling, and chemical conversion treatment by phosphate treatment (such as zinc phosphate) is performed for lubrication treatment.
- Specific desiccation and lubrication procedures include descaling, washing and neutralizing the inner and outer surfaces of the tube, rinsing and rinsing the washed tube into a phosphate treatment bath, and adding phosphate to the inner and outer surfaces. Form the foundation of. Next, the surface is washed with hot water, and after being treated with soap containing sodium stearate as a main component, drying with hot air is performed.
- the present invention has been made in view of the above-described problems in the drawing of the internally ribbed steel pipe, and pre-heating the drawing plug before drawing to form the helical rib. It aims at providing the manufacturing method of the steel pipe with an inner surface rib which can reduce the trouble at the time of drawing processing which forms a spiral rib, and can form a spiral rib stably by controlling heating temperature. .
- the drawing process of the internally ribbed steel pipe is performed by using a plug in which a spiral groove having a cross-sectional shape as shown in FIG. 2 or FIG. 3 is formed on the outer peripheral surface, and inserting this plug into the inner surface of the formed raw pipe. Performed by drawing.
- the drawing process for forming the helical rib is performed at a high temperature due to the heat generated by the plastic deformation. Done under environmental conditions.
- the drawing of the steel pipe with the inner rib is performed at the top of the groove of the spiral groove provided in the drawing plug from the initial stage of drawing to the final stage. Since it always contacts the surface of the raw tube, the contact length between the plug and the raw tube is inevitably increased.
- the contact length between the plug and the base pipe in the drawing process of a normal boiler steel pipe or heat exchanger steel pipe is about 3 mm, although it depends on the machining dimensions, but the finishing dimension is 28 to
- the contact length between the plug and the raw pipe ranges from 10 to 15 mm.
- the contact length between the plug and the raw pipe is increased, so that the steel pipe with the inner rib is likely to be seized, and the drawing process of the steel pipe with the inner rib is regarded as a severe plastic processing.
- the drawing process is performed from the initial stage of the drawing process to the final stage of processing to the finished dimensions. It is necessary to maintain the contact between the spiral groove provided in the plug for use and the inner surface of the blank tube via the chemical conversion coating.
- the present inventor paid attention to the technical matters related to the drawing process of the steel pipe with the inner rib described above, and as a result of various studies, the preheating of the drawing plug was performed before the drawing process for forming the spiral rib. It was found that troubles during the drawing process for forming the spiral rib can be reduced by controlling the heating temperature within a temperature range suitable for the drawing process performed in a high temperature environment.
- the present invention has been completed based on the above findings, and the gist of the following (1) and (2) manufacturing method of a steel pipe with an inner rib, and (3) a pulling plug for the inner ribbed steel pipe. .
- (1) Insert a plug with a plurality of spiral grooves formed on the outer peripheral surface into the inner surface of the tube to be processed, and perform cold drawing to form a plurality of spiral ribs in the tube axis direction.
- the chemical conversion treatment is a pickling process for removing oxidized scale and rust on the pipe surface, a process for forming a zinc phosphate coating on the neutralized pipe surface, and It is desirable to carry out in a step of forming a lubricating layer on the zinc phosphate coating.
- the radius of curvature of the portion where the opposite side walls and the bottom surface intersect with each other forming the spiral groove is successively reduced from the front end side to the rear end side of the plug held by the mandrel.
- This is a plug for drawing a steel pipe with an inner rib.
- it is desirable that the radius of curvature of the portion where the opposite side walls and the top surface intersect with each other to form the spiral groove is successively reduced from the front end side to the rear end side of the plug held by the mandrel.
- the drawing plug is formed by preheating the drawing plug before drawing to form the helical rib and controlling the heating temperature thereof. Processing troubles can be suppressed and the helical rib can be formed stably.
- the internally ribbed steel pipe thus obtained has excellent formability and quality.
- FIG. 1 is a diagram schematically illustrating a method of manufacturing an internally ribbed steel pipe by drawing.
- FIG. 2 is a view showing a cross-sectional shape of a spiral groove formed in a drawing plug used for manufacturing a steel pipe with an inner rib.
- FIG. 3 is a view showing a cross-sectional shape of a spiral groove formed in a drawing plug used for manufacturing an internally ribbed steel pipe according to another embodiment.
- FIG. 4 is a diagram showing an example of a chemical conversion treatment process that can be applied to the method for manufacturing an internally ribbed steel pipe of the present invention.
- the steel types targeted by the internally ribbed steel pipe of the present invention are carbon steel (for example, JIS G 3461, STB 340 to 510) and Cr-based low alloy steel (for example, JIS G 3462, STBA 12 to 24). As seamless steel pipe and ERW steel pipe can be applied.
- seamless steel pipes are manufactured by hot rolling due to excellent production efficiency, and manufactured by hot rolling, and ERW steel pipes are used to prevent weld oxidation and stabilize weld beads.
- the necessity of the pipe softening process is determined according to the steel type and manufacturing conditions of the pipe.
- the raw pipe subjected to the inner rib processing is applied to the inner and outer surfaces of the raw pipe after the pipe softening or before the drawing process to form the spiral rib without softening the pipe.
- a chemical conversion treatment is performed.
- FIG. 4 is a diagram showing an example of a chemical conversion treatment process that can be applied to the method of manufacturing an internally ribbed steel pipe according to the present invention.
- pickling is performed as a first treatment step to remove oxide scale and rust adhering to the surface.
- sulfuric acid (10 to 13%) is used as the acid to be used, and free acidity and iron concentration are used as management items.
- the treatment temperature is room temperature and the immersion time is 30 minutes. After this pickling, washing with water (for example, about several minutes) is performed to wash away the acid remaining on the surface.
- the base tube is immersed in a caustic soda solution for neutralization.
- the neutral pipe surface can be stabilized by this neutralization.
- a zinc phosphate coating treatment is performed to form a phosphate coating foundation on the surface of the raw tube.
- the conditions for the zinc phosphate coating treatment at this time are as follows.
- the treatment temperature is about 80 ° C. and the immersion time is 30 minutes.
- washing with hot water for example, at a treatment temperature of 50 ° C. for about several minutes is performed.
- the formed zinc phosphate film is reacted with a soap-based lubricant to form a lubricating layer on the surface.
- the treatment for forming the lubricating layer is generally performed by reacting sodium stearate with a zinc phosphate coating to form a metal soap layer, but the manufacturing method of the present invention is not limited thereto.
- the treatment conditions for forming the lubrication layer are as follows.
- the treatment temperature is about 80 ° C. and the immersion time is 15 minutes.
- the raw tube subjected to the chemical conversion treatment is dried by the first to third treatment steps.
- a method of charging the raw tube into a continuous drying furnace and drying in a high temperature atmosphere can be employed.
- the spiral groove provided in the drawing plug and the blank tube are formed from the initial stage of the drawing process to the final stage of processing to the finished dimensions.
- the drawing plug that is inserted into the inner surface of the blank tube is preheated to 50 to 200 ° C. to perform the drawing process. It is possible to manufacture a steel pipe with an inner rib that is reduced and has excellent dimensional accuracy and manufacturing yield.
- the specific preheating procedure is to form a heating zone formed by a heating coil in an annular shape, insert a drawing plug inside the annular heating zone, and heat it to a predetermined temperature range.
- the heating timing is the state before the drawing plug is held by the mandrel, or even if the drawing plug is held by the mandrel, as long as it is before the drawing process for forming the spiral rib. It may be in a state.
- the drawing plug of the present invention only needs to have a configuration of an outer peripheral surface in which rib forming on the inner surface of the raw tube is performed stepwise.
- a spiral groove 1a is formed, and the curvature radius r of the portion where the opposite side walls 1aa and the bottom surface 1ab intersect with each other is formed sequentially from the front end side to the rear end side of the plug held by the mandrel.
- the configuration is reduced.
- a plurality of spiral grooves are formed on the outer peripheral surface for forming a rib, and the spiral grooves are formed and the opposite side walls and the bottom surface of the groove mountain intersect.
- the radius of curvature r can be successively reduced from the front end side to the rear end side of the plug held by the mandrel.
- a plurality of spiral grooves 1a are formed on the outer peripheral surface for forming ribs.
- the radius of curvature r of the portion where both side walls 1aa and the bottom surface 1ab intersect is kept constant from the front end side to the rear end side of the plug held by the mandrel, and from the front end side to the rear end side of the plug A structure in which the diameter is reduced with a certain gradient toward the surface can be used.
- the internally ribbed steel pipe obtained by the present invention is manufactured by using the pulling plug of the present invention in the above-described manufacturing method, and has excellent formability and dimensional accuracy as a steel pipe for boilers. It can cope with large capacity and high temperature and pressure.
- the effects of the manufacturing method of the present invention will be described based on specific examples.
- Example 1 In Example 1, a seamless steel pipe having a steel type of JIS STBA22 (1Cr-1 / 2Mo steel) was used as a raw pipe, and the softening process, pickling / lubrication process, intermediate drawing (round finish), and softening process Then, a steel pipe with an inner rib having four spiral ribs was produced by drawing.
- the drawing schedule at this time is as follows: the tube size is 38.0 mm outside diameter x 8.2 mm wall thickness, the drawing dimension is 32.0 mm outside diameter x 7.2 mm wall thickness, and finally 28.6 mm outside diameter x Drawing was performed to a thickness of 6.0 mm ⁇ rib depth of 0.8 mm.
- sulfuric acid (10 to 13%) is used to perform pickling with a treatment temperature of room temperature and a treatment time of 30 minutes.
- Metal phosphate soap is treated with zinc phosphate coating at a treatment temperature of 75 to 85 ° C for a treatment time of 30 minutes, and sodium stearate is reacted with the zinc phosphate coating at a treatment temperature of 75 to 85 ° C for a treatment time of 15 minutes.
- a layer was formed.
- the extraction plug used was a plug in which a spiral groove having a cross-sectional shape shown in FIG. 2 was formed on the outer peripheral surface, and was inserted into an annular heating zone formed by a heating coil and preheated. After drawing and heating to a predetermined temperature range, a drawing process for forming a spiral rib was performed.
- Table 1 shows the heating temperature and the drawing process status during preheating of the drawing plug.
- ⁇ indicates no occurrence of seizure
- ⁇ indicates occurrence of slight seizure
- x indicates occurrence of significant seizure.
- Example 2 In Example 2, a seamless steel pipe having a steel type of JIS STBA24 (2Cr-1Mo steel) was used as a raw pipe, and the raw pipe was softened, pickled, lubricated, drawn in the middle (round finish), and subjected to a softening process. Thereafter, a steel pipe with an inner rib having four spiral ribs was manufactured by drawing.
- the drawing schedule at this time is as follows: the raw tube dimensions are an outer diameter of 87.0 mm ⁇ wall thickness of 10.2 mm, the intermediate drawing dimensions are an outer diameter of 80.0 mm ⁇ wall thickness of 9.2 mm, and finally an outer diameter of 70.0 mm ⁇ Drawing was performed to a thickness of 8.0 mm and a rib depth of 1.1 mm.
- Example 1 The conditions of the chemical conversion treatment before the drawing process for finally forming the spiral rib were the same as those in Example 1. Moreover, the shape of the used plug for extraction and the preheating of the extraction plug were the same as in Example 1, and after heating to a predetermined temperature range, a drawing process for forming a spiral rib was performed.
- Comparative Example 3 that did not reach the preheating temperature defined in the present invention, significant seizure occurred in the rib forming portion on the inner surface of the raw tube from the start of the drawing process. Further, in Comparative Example 4 exceeding the preheating heating temperature defined in the present invention, the chemical conversion treatment film was found to be broken, and remarkable seizure occurred.
- the drawing plug is formed by preheating the drawing plug before the drawing process for forming the helical rib and controlling the heating temperature thereof. Processing troubles can be suppressed and the helical rib can be formed stably.
- the steel pipe with the inner ribs obtained has excellent formability and quality as a steel pipe for boilers, and thus can sufficiently cope with the large capacity and high temperature and high pressure of boilers and can be widely applied. .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geometry (AREA)
- Manufacturing & Machinery (AREA)
- Metal Extraction Processes (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
Description
(1)化成処理された被加工管の内面に、外周面に複数条の螺旋溝が形成されたプラグを挿入して冷間引抜加工を行い、管軸方向に複数条の螺旋状リブを形成する内面リブ付鋼管の製造方法であって、前記プラグを50~200℃にプレヒーティングして引抜加工を行い、前記螺旋状リブを素管内面に形成することを特徴とする内面リブ付鋼管の製造方法である。
さらに、螺旋溝を形成し相対する両側壁と頂面とが交わる部分の曲率半径も、逐次、前記マンドレルに保持されるプラグの先端部側から後端部側に亘り減少させるのが望ましい。
図2は、内面リブ付鋼管の製造に用いられる引抜用プラグに形成される螺旋溝の断面形状を示す図である。
図3は、他の実施形態に係る、内面リブ付鋼管の製造に用いられる引抜用プラグに形成される螺旋溝の断面形状を示す図である。
図4は、本発明の内面リブ付鋼管の製造方法に適用できる化成処理の工程例を示す図である。
実施例1では、鋼種がJIS STBA22(1Cr-1/2Mo鋼)である継目無鋼管を素管として用いて、素管軟化-酸洗・潤滑処理-途中引抜加工(円仕上げ)-軟化の工程を経た後、引抜加工により4条の螺旋状リブを有する内面リブ付鋼管を製造した。
実施例2では、鋼種がJIS STBA24(2Cr-1Mo鋼)である継目無鋼管を素管に用いて、素管軟化-酸洗・潤滑処理-途中引抜加工(円仕上げ)-軟化の工程を経た後、引抜加工により4条の螺旋状リブを有する内面リブ付鋼管を製造した。
これにより、得られた内面リブ付鋼管は、ボイラー用鋼管として優れた成形性と品質を備えていることから、ボイラーの大容量化や高温高圧化に十分に対応できるものであり、広く適用できる。
Claims (4)
- 化成処理された被加工管の内面に、外周面に複数条の螺旋溝が形成されたプラグを挿入して冷間引抜加工を行い、管軸方向に複数条の螺旋状リブを形成する内面リブ付鋼管の製造方法であって、
前記プラグを50~200℃にプレヒーティングして引抜加工を行い、前記螺旋状リブを被加工管の内面に形成することを特徴とする内面リブ付鋼管の製造方法。 - 前記化成処理が管表面の酸化スケールおよび錆びを取り除く酸洗工程、中和された管表面に燐酸亜鉛皮膜を形成する工程、および前記燐酸亜鉛皮膜の上に潤滑層を形成する工程からなることを特徴とする請求項1に記載の内面リブ付鋼管の製造方法。
- 片端をマンドレルに保持されて、請求項1または2に記載の内面リブ付鋼管の製造方法に用いられるプラグであって、
外周面にリブ成形用として複数条の螺旋溝が形成され、この螺旋溝を形成し相対する両側壁と底面とが交わる部分の曲率半径を、逐次、前記マンドレルに保持されるプラグの先端部側から後端部側に亘り減少させたことを特徴とする内面リブ付鋼管の引抜用プラグ。 - 請求項3に記載の内面リブ付鋼管の製造方法に用いられるプラグであって、
さらに、螺旋溝を形成し相対する両側壁と頂面とが交わる部分の曲率半径を、逐次、前記マンドレルに保持されるプラグの先端部側から後端部側に亘り減少させたことを特徴とする内面リブ付鋼管の引抜用プラグ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2008801227142A CN101909774B (zh) | 2007-12-26 | 2008-10-28 | 内表面带筋钢管的制造方法 |
EP08865497.5A EP2228149B1 (en) | 2007-12-26 | 2008-10-28 | Production method of internally-ribbed steel pipe |
JP2008550581A JP4311503B1 (ja) | 2007-12-26 | 2008-10-28 | 内面リブ付鋼管の製造方法 |
US12/823,462 US8281635B2 (en) | 2007-12-26 | 2010-06-25 | Production method of internally ribbed steel tube and drawing plug for use therein |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007334087 | 2007-12-26 | ||
JP2007-334087 | 2007-12-26 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/823,462 Continuation US8281635B2 (en) | 2007-12-26 | 2010-06-25 | Production method of internally ribbed steel tube and drawing plug for use therein |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009081655A1 true WO2009081655A1 (ja) | 2009-07-02 |
Family
ID=40800971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/069545 WO2009081655A1 (ja) | 2007-12-26 | 2008-10-28 | 内面リブ付鋼管の製造方法およびそれに用いられる引抜用プラグ |
Country Status (5)
Country | Link |
---|---|
US (1) | US8281635B2 (ja) |
EP (1) | EP2228149B1 (ja) |
JP (1) | JP4311503B1 (ja) |
CN (1) | CN101909774B (ja) |
WO (1) | WO2009081655A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016084361A1 (ja) * | 2014-11-25 | 2016-06-02 | 新日鐵住金株式会社 | ライフルチューブの製造方法 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8919172B2 (en) * | 2010-11-23 | 2014-12-30 | International Business Machines Corporation | In situ formation of threads throughout bore of sleeve inserted into substrate hole |
CN102500639B (zh) * | 2011-10-27 | 2014-08-06 | 隆昌山川精密焊管有限责任公司 | 减少方管打尖次数的矩形管生产工艺方法 |
CN102699633A (zh) * | 2012-06-11 | 2012-10-03 | 常熟市旋力轴承钢管有限公司 | 圆钢热穿孔用顶头的制备方法 |
US9297410B2 (en) * | 2012-12-31 | 2016-03-29 | Smith International, Inc. | Bearing assembly for a drilling tool |
JP7246187B2 (ja) | 2015-10-29 | 2023-03-27 | エレクトリック パワー リサーチ インスチテュート インコーポレイテッド | 腐食耐性のための金属構成要素に亜鉛-金属酸化物層を生成する方法 |
US20170128993A1 (en) * | 2015-11-06 | 2017-05-11 | Penn Aluminum International LLC | Floating Draw Plug and Method of Drawing Tube |
US20180372413A1 (en) | 2017-06-22 | 2018-12-27 | Rheem Manufacturing Company | Heat Exchanger Tubes And Tube Assembly Configurations |
CN111842517A (zh) * | 2020-07-24 | 2020-10-30 | 浙江久立特材科技股份有限公司 | 一种带肋包壳管的冷拔模具、生产工艺及其成品管 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63260621A (ja) * | 1987-04-17 | 1988-10-27 | Kobe Steel Ltd | 金属管の内面溝付加工方法 |
JPH0231205Y2 (ja) * | 1984-10-18 | 1990-08-23 | ||
JP2001179327A (ja) | 1999-12-17 | 2001-07-03 | Sumitomo Metal Ind Ltd | ライフルチューブ抽伸用プラグ |
JP2002361319A (ja) * | 2001-06-05 | 2002-12-17 | Sumitomo Metal Ind Ltd | 内面平滑性に優れた継目無鋼管の製造方法および継目無鋼管 |
JP2003080337A (ja) * | 2001-06-13 | 2003-03-18 | Toyota Central Res & Dev Lab Inc | 加圧成形方法および加圧成形部材 |
JP2006272392A (ja) | 2005-03-29 | 2006-10-12 | Sumitomo Metal Ind Ltd | ライフルチューブ引抜加工用工具及びこれを用いたライフルチューブの製造方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3036696A (en) * | 1959-02-24 | 1962-05-29 | Reisholz Stahl & Roehrenwerk | Method of producing seamless tubular articles |
US3293894A (en) * | 1964-05-28 | 1966-12-27 | Babcock & Wilcox Co | Hot drawing tubes |
JPS54120446A (en) * | 1978-03-10 | 1979-09-19 | Sumitomo Metal Ind Ltd | Fin pipe with spiral ribs inside and its manufacturing process |
GB8411289D0 (en) * | 1984-05-02 | 1984-06-06 | Sansome D H | Plug drawing |
JPH0231205A (ja) | 1988-07-21 | 1990-02-01 | Mitsubishi Electric Corp | ディジタル適応制御方法及び装置 |
CN1110634A (zh) * | 1995-02-24 | 1995-10-25 | 石家庄铝厂 | 内螺纹管的制造方法及装置 |
US5881592A (en) * | 1998-04-22 | 1999-03-16 | Cerro Copper Products Co. | Floating plug for drawing of tubes |
JP2001241877A (ja) * | 2000-02-25 | 2001-09-07 | Furukawa Electric Co Ltd:The | 内面溝付管及びその製造方法 |
DE60206844T2 (de) | 2001-06-13 | 2006-07-27 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Verfahren zur Umformung unter Druck und dadurch erzeugtes Element |
CN1431061A (zh) * | 2002-01-09 | 2003-07-23 | 贵州华电建设工程接头技术有限责任公司 | 热挤压套筒内螺纹加工方法 |
US7021106B2 (en) * | 2004-04-15 | 2006-04-04 | Mitsui Babcock (Us) Llc | Apparatus and method for forming internally ribbed or rifled tubes |
CN1695841A (zh) * | 2005-05-20 | 2005-11-16 | 天津理工大学 | 冷拔内螺纹钢管的生产方法 |
-
2008
- 2008-10-28 JP JP2008550581A patent/JP4311503B1/ja active Active
- 2008-10-28 CN CN2008801227142A patent/CN101909774B/zh active Active
- 2008-10-28 WO PCT/JP2008/069545 patent/WO2009081655A1/ja active Application Filing
- 2008-10-28 EP EP08865497.5A patent/EP2228149B1/en active Active
-
2010
- 2010-06-25 US US12/823,462 patent/US8281635B2/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0231205Y2 (ja) * | 1984-10-18 | 1990-08-23 | ||
JPS63260621A (ja) * | 1987-04-17 | 1988-10-27 | Kobe Steel Ltd | 金属管の内面溝付加工方法 |
JP2001179327A (ja) | 1999-12-17 | 2001-07-03 | Sumitomo Metal Ind Ltd | ライフルチューブ抽伸用プラグ |
JP2002361319A (ja) * | 2001-06-05 | 2002-12-17 | Sumitomo Metal Ind Ltd | 内面平滑性に優れた継目無鋼管の製造方法および継目無鋼管 |
JP2003080337A (ja) * | 2001-06-13 | 2003-03-18 | Toyota Central Res & Dev Lab Inc | 加圧成形方法および加圧成形部材 |
JP2006272392A (ja) | 2005-03-29 | 2006-10-12 | Sumitomo Metal Ind Ltd | ライフルチューブ引抜加工用工具及びこれを用いたライフルチューブの製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2228149A4 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016084361A1 (ja) * | 2014-11-25 | 2016-06-02 | 新日鐵住金株式会社 | ライフルチューブの製造方法 |
TWI566850B (zh) * | 2014-11-25 | 2017-01-21 | Nippon Steel & Sumitomo Metal Corp | The manufacturing method of the complex pipe |
KR20170087940A (ko) | 2014-11-25 | 2017-07-31 | 신닛테츠스미킨 카부시키카이샤 | 라이플 튜브의 제조 방법 |
JPWO2016084361A1 (ja) * | 2014-11-25 | 2017-11-02 | 新日鐵住金株式会社 | ライフルチューブの製造方法 |
EP3225319A4 (en) * | 2014-11-25 | 2018-08-08 | Nippon Steel & Sumitomo Metal Corporation | Method for manufacturing rifled tube |
KR101950628B1 (ko) | 2014-11-25 | 2019-02-20 | 신닛테츠스미킨 카부시키카이샤 | 라이플 튜브의 제조 방법 |
US10632521B2 (en) | 2014-11-25 | 2020-04-28 | Nippon Steel Corporation | Method for producing a rifled tube |
Also Published As
Publication number | Publication date |
---|---|
US20100319425A1 (en) | 2010-12-23 |
EP2228149B1 (en) | 2017-02-01 |
JP4311503B1 (ja) | 2009-08-12 |
CN101909774B (zh) | 2012-10-24 |
JPWO2009081655A1 (ja) | 2011-05-06 |
US8281635B2 (en) | 2012-10-09 |
EP2228149A4 (en) | 2016-06-08 |
CN101909774A (zh) | 2010-12-08 |
EP2228149A1 (en) | 2010-09-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4311503B1 (ja) | 内面リブ付鋼管の製造方法 | |
JPWO2009051037A1 (ja) | 内面リブ付鋼管の製造方法および内面リブ付鋼管 | |
KR101157347B1 (ko) | 피복 초경 플러그 및 그것을 이용한 냉간 인발 방법 | |
CN107931331B (zh) | 一种高精度二辊冷轧无缝钢管的生产方法 | |
CN102294456B (zh) | 一种离心坯斜轧双金属复合无缝钢管的制造方法 | |
JP6431548B2 (ja) | ライフルチューブの製造方法 | |
JP2009242837A (ja) | 工具磨耗低減銅合金鋳塊及び銅合金管 | |
JP4462378B2 (ja) | 内面リブ付鋼管の製造方法 | |
CN111014314A (zh) | 一种钛管生产加工方法 | |
RU2426617C1 (ru) | Способ изготовления тонкостенных оболочек | |
JP2006247664A (ja) | 鋼管の冷間曲げ加工方法 | |
JP5045819B2 (ja) | 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 | |
JP4788101B2 (ja) | 冷間引抜鋼管の製造方法 | |
CN113617844B (zh) | 一种钢管轧辊及钢管加工方法 | |
JP4687498B2 (ja) | 熱間電気抵抗溶接鋼管の製造方法 | |
RU2777380C1 (ru) | Способ изготовления оболочек сложного профиля с внутренними рифлями | |
RU2025177C1 (ru) | Способ изготовления металлических газовых баллонов | |
CN117340037A (zh) | 一种利用冷扩和冷拔联合工艺生产110钢级超级双相钢无缝钢管的方法 | |
CN116393516A (zh) | 一种n08810高镍合金无缝钢管扩连冷加工工艺 | |
JPH09303985A (ja) | 拡管性に優れた熱交換器用銅管 | |
SU1438866A1 (ru) | Способ гор чей продольной прокатки труб | |
JPH0459118A (ja) | 細径内面溝付管の製造方法 | |
JPH10288490A (ja) | 伝熱管およびその製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200880122714.2 Country of ref document: CN |
|
ENP | Entry into the national phase |
Ref document number: 2008550581 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 08865497 Country of ref document: EP Kind code of ref document: A1 |
|
REEP | Request for entry into the european phase |
Ref document number: 2008865497 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2008865497 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |