WO2016143271A1 - 電縫溶接ステンレスクラッド鋼管およびその製造方法 - Google Patents
電縫溶接ステンレスクラッド鋼管およびその製造方法 Download PDFInfo
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- WO2016143271A1 WO2016143271A1 PCT/JP2016/000850 JP2016000850W WO2016143271A1 WO 2016143271 A1 WO2016143271 A1 WO 2016143271A1 JP 2016000850 W JP2016000850 W JP 2016000850W WO 2016143271 A1 WO2016143271 A1 WO 2016143271A1
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- Prior art keywords
- gas
- steel pipe
- welded
- clad steel
- electric resistance
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000003466 welding Methods 0.000 claims abstract description 39
- 239000010935 stainless steel Substances 0.000 claims abstract description 30
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 128
- 239000011261 inert gas Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000010953 base metal Substances 0.000 claims description 5
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 16
- 239000001301 oxygen Substances 0.000 description 16
- 229910052760 oxygen Inorganic materials 0.000 description 16
- 239000002648 laminated material Substances 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000011324 bead Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/08—Dies with different parts for several steps in a process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/06—Resistance welding; Severing by resistance heating using roller electrodes
- B23K11/061—Resistance welding; Severing by resistance heating using roller electrodes for welding rectilinear seams
- B23K11/062—Resistance welding; Severing by resistance heating using roller electrodes for welding rectilinear seams for welding longitudinal seams of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/08—Seam welding not restricted to one of the preceding subgroups
- B23K11/087—Seam welding not restricted to one of the preceding subgroups for rectilinear seams
- B23K11/0873—Seam welding not restricted to one of the preceding subgroups for rectilinear seams of the longitudinal seam of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
- B23K13/025—Seam welding for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/04—Welding by high-frequency current heating by conduction heating
- B23K13/043—Seam welding
- B23K13/046—Seam welding for tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/06—Welding by high-frequency current heating characterised by the shielding of the welding zone against influence of the surrounding atmosphere
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/10—Pipe-lines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Definitions
- the present invention relates to an electric resistance welded stainless clad steel pipe and a method for manufacturing the same, and more particularly, to an electric resistance welded stainless clad steel pipe having excellent weld characteristics as it is electric resistance welded and a method for manufacturing the same.
- an electric resistance welded steel pipe is manufactured by forming a steel plate (also called a steel strip) into a tubular shape and welding the opposite ends of the steel strip heated and melted by high-frequency current by butt-pressing them with a squeeze roll. .
- a steel plate also called a steel strip
- the characteristics of the welded part are inferior to that of the base metal, and in application of the steel pipe, guarantees such as toughness, strength and elongation of the welded part have always been discussed for each application.
- the cause of the deterioration of the characteristics of ERW welds is that an oxide-based welding defect called penetrator is caused by welded parts during ERW welding (specifically, the circumferential direction of the open pipe formed by rolling the strip) In many cases, the toughness is reduced or the strength is insufficient due to the remaining penetrator.
- the amount of upset by the squeeze roll is made larger than the plate thickness (t), and the oxidized melt generated during welding is discharged to the outer surface of the pipe. Measures have been taken.
- the clad steel here refers to clad steel composed of low carbon low alloy steel as a base material and stainless steel as a laminated material.
- Patent Document 1 discloses that at least a laminated material side bead in a welded bead obtained by butt-welding opposite clad steel plates or steel strips which are bent in a tubular shape is cut to a depth reaching the base material.
- a method for manufacturing a clad pipe that is removed and is subjected to overlay welding having the same properties as the laminated material at the cut-off portion is disclosed.
- Patent Document 2 after forming a clad steel strip into a blank tube and performing seam welding on the seam edge portion, it is melted and solidified to the depth of the clad interface portion along the weld seam into which a dissimilar metal has infiltrated.
- Patent Document 3 in a method for manufacturing a clad steel welded steel pipe having an inner surface as a laminated material, at least a part of a laminated material butt of a tubular body having an inner surface as a laminated material by forming a clad steel original plate or an original coil is provided.
- a method for manufacturing a clad steel welded steel pipe is disclosed in which electric seam welding is performed and then the butt-unwelded portion is overlay welded.
- JP 60-221173 A JP-A-62-156087 JP-A-5-154545
- Patent Document 1 all of the techniques described in Patent Documents 1 to 3 described above involve cutting and removing the bead portion of the mating material after overlay welding (Patent Document 1), TIG arc heat source along the welding seam, etc. Since additional welding processes such as fusion / solidification or overlay welding (Patent Document 2) and overlay welding of the butt-unwelded part (Patent Document 3) are required, productivity is reduced and manufacturing costs are reduced. In addition to the increase, there is a problem that an additional build-up welding has an adverse environmental impact.
- An object of the present invention is to provide an electric resistance welded stainless clad steel pipe having excellent weld characteristics and a method for producing the same without performing an additional welding process after electric resistance welding, which is required in the prior art. It is to be.
- the characteristics of the excellent welded part mainly indicate that the fracture characteristic is excellent, the shape of the welded part is good, and the corrosion resistance is excellent.
- the present inventors diligently studied to solve the above-mentioned problems, and as a result, the pipe range from the edge heating start point to the weld point of the blank pipe was not covered with a shield box, and the element was within the pipe range.
- the nozzle height which is the height from the upper end of the welded part to the shield gas discharge nozzle in the shield gas spraying nozzle, and the shield gas to be sprayed
- the structure of the nozzle for blowing the shield gas is divided into three or more layers in the circumferential direction of the raw tube, It has been found that the oxygen concentration in the welded part can be significantly reduced by appropriately controlling the ratio of the flow velocity of the blowing gas from the gas discharge ports of the remaining layers.
- the laminated material on the inner surface side of the tube is made of stainless steel (SUS316) having a thickness of 2 mm
- the base material on the outer surface side of the tube is made of a low carbon low alloy steel having a thickness of 5 mm.
- an ERW welded stainless clad steel pipe is manufactured by changing the oxygen concentration of the welded part with an upset amount that is less than the plate thickness so that the low alloy steel on the pipe outer surface side does not penetrate into the stainless steel seam part on the pipe inner surface side. Then, a flat test of the seam portion was performed. As a result, as shown in FIG.
- the shape of the gas discharge port is a rectangular shape having a length of 30 mm or more as a component in a pipe passage direction of a dimension and a width of 5 mm or more as a component of an element tube edge butting direction as a dimension.
- the width R which is a component of the tube edge butting direction of the combined dimensions of all layers of the gas discharge port, is R / W> with respect to the maximum interval W between the end faces of the welded portion immediately below the gas discharge port.
- FIG. 1 is a schematic view showing an embodiment of the present invention.
- a strip made of steel strip is continuously paid out with an uncoiler (not shown), corrected with a leveler (not shown), and sent in the pipe passing direction 20, while the width of the strip is rounded with a roll forming machine (not shown) to open a raw pipe (open pipe)
- the welded portion 11 which is a base tube edge butting portion formed by butting both end faces of the rounded width is composed of an electric resistance welding machine (a power supply means for heating an edge portion (not shown) and a squeeze squeeze roll (not shown).
- the electric resistance welding steel pipe 15 is obtained by electric resistance welding.
- Reference numeral 12 denotes an element pipe edge heating start point
- reference numeral 13 denotes a welding point indicating a pipe passing direction position where the welded part 11 is joined by the pressure welding.
- an impeder (not shown) may be disposed on the inner surface side of the base tube 10 to the ERW steel tube 15. The outer diameter of the ERW steel pipe 15 exiting the ERW welder is adjusted by a sizer (not shown).
- symbol 2 shows gas piping and the code
- a shield range and in this shield range, a shield gas spray nozzle (nozzle for short) 1 is arranged at a position immediately above the welded portion 11.
- the nozzle 1 is disposed with its gas discharge port 1A positioned so as to face the upper end of the welded portion 11.
- the nozzle 1 is divided into three layers with respect to the tube circumferential direction 30 as shown in FIG. 1 (b) and FIGS. 2 (a) and 2 (d). These layers form gas passages independent of each other. Still further, the central layer 1C of the three layers may be divided into two or more layers with respect to the raw tube circumferential direction 30, as shown in FIGS. 2 (b) and 2 (c). The two end layers 1E are one layer each.
- the shield box that covers the entire circumference of the raw tube 10 within the shield range as described in the background art may not be provided. Rather, it is not provided in this embodiment because it is preferable not to provide it from the viewpoint of pipe making efficiency and manufacturing cost of the ERW steel pipe.
- the inventors observed in detail the flow of the shielding gas. Furthermore, various shield gas spraying conditions such as the position and size of the gas discharge port 1A and the flow velocity of the shield gas at the gas discharge port 1A of each of the center layer 1C and the both end layers 1E are affected by the coverage during the electric resistance welding. The influence on the oxygen concentration of the welded part 11 and the area ratio of the oxide in the welded part formed by electro-welding the welded part was investigated in detail.
- the oxide area ratio of the weld is defined as follows. That is, a fracture surface obtained by conducting a Charpy impact test of an electric resistance welded portion is observed with an electron microscope at a magnification of 500 times or more and at least 10 visual fields, and a dimple fracture surface containing oxide observed in the fracture surface A portion was selected and its total area was measured, and the ratio of the total area of the visual field was defined as the oxide area ratio.
- the optimum condition found above is that the nozzle height, which is the height from the upper end of the welded portion 11 to the gas discharge port 1A, is 5 mm or more and 300 mm or less (see FIG. 1 (c)), and the gas release of the central layer 1C is performed.
- the shield gas does not reach the welded part 11 sufficiently, and the oxygen concentration of the welded part 11 does not become 100 ppm or less. It is desirable that the nozzle height is small. However, if the nozzle height is less than 5 mm, the gas discharge port 1A is easily damaged by the radiant heat from the heated welded part 11, and the spatter generated in the welded part 11 collides. As a result, the durability of the nozzle 1 deteriorates.
- the flow rate of the shield gas discharged from the gas discharge port is set to the gas discharge flow rate from the gas discharge port of the central layer 1C of the three layers.
- the gas flow regulator 3 (see FIGS. 1A and 1B) was included.
- the flow velocity B is in the proper range of 0.5 to 50 m / s.
- the central layer C is further divided into a plurality of layers (for example, FIGS. 2B and 2C)
- the flow velocity B for the plurality of layers does not necessarily have the same value, and the appropriate range As long as it is within the range, the value may be different for each layer.
- the shielding gas 5 is filled between the end faces of the welded portion 11 without excess or deficiency, and sufficient gas shielding can be achieved without involving air. 3 (b)).
- the flow rate B at the gas flow rate ratio B / A is such that when the central layer 1C is divided into a plurality of layers and the gas flow rate from at least one of the plurality of layers is different from that of the other layers, the different gas Use the maximum flow rate among the flow rates.
- B / A 0.03 to 5 because 0.001 to 0.0001 mass%, which is a lower oxygen concentration level, can be achieved.
- B / A 0.03 to 5 is preferable in order to achieve the oxygen concentration level: 0.001 to 0.0001 mass%.
- the width which is the component of the raw tube edge butting direction of the combined size of the gas discharge ports 1A is denoted by R, and the end surface of the welded portion 11 immediately below the gas discharge port 1A. It is preferable to satisfy R / W> 1.0, where W is the maximum interval between the two because the oxygen concentration of the welded part 11 can be reduced more quickly.
- Inert gas is used as shielding gas.
- the inert gas referred to here means nitrogen gas, helium gas, argon gas, neon gas, xenon gas, or the like, or a mixed gas formed by mixing two or more of these.
- the shielding gas a gas containing 0.1% by mass or more of a reducing gas may be used instead of the inert gas. However, this rather suppresses the generation of oxides that cause the penetrator. This is preferable because the effect becomes stronger and the toughness or strength of the welded portion can be greatly improved.
- the reducing gas means hydrogen gas, carbon monoxide gas, methane gas, propane gas, or a mixed gas obtained by mixing two or more of these.
- a gas containing 0.1 mass% or more of reducing gas the composition which consists only of reducing gas, or the composition which contains reducing gas: 0.1 mass% or more and the remainder consists of an inert gas. Those are preferred.
- the shielding gas (B) When using an inert gas alone: (G1) Any one of nitrogen gas, helium gas, and argon gas, or a mixture of two or more of these (B) When using reducing gas alone: (G2) One of hydrogen gas or carbon monoxide gas, or a mixture of these two (C) When using a mixed gas of inert gas and reducing gas: Mixed gas of the above (G1) and (G2) In particular, if a gas containing hydrogen gas and / or carbon monoxide gas is used, it is left out Needless to say, safety measures should be taken.
- the upset amount was obtained by measuring the outer peripheral length of the pipe immediately before welding, and then measuring the outer peripheral length after removing the excess portion of the pipe after welding, and calculating the difference between the two.
- the ERW steel pipe (ERW welded stainless clad steel pipe) 15 of the present invention obtained as described above is made of clad steel made of low carbon low alloy steel and stainless steel, and the ERW welded portion remains as ERW weld.
- the flatness characteristic satisfies the following formula (1), and has an electric resistance welded portion excellent in fracture characteristics.
- h flat crack height (mm)
- D pipe outer diameter (mm).
- the above flatness characteristics can be measured by a 90 ° flattening test. After cutting the tube to a length of 300 mm, a weld is installed at the 90 ° position of the tube when the top is 0 °. Then, a flattening test is performed, and the flattening height (flattening cracking height h) when a crack occurs in the welded portion is obtained by dividing by the pipe outer diameter D.
- the thickness tw (mm) of the ERW welded portion is 0.7 ⁇ tb (mm) or less, the strength of the ERW welded portion may decrease, so tw is 0.7 ⁇ tb. Is preferably larger.
- Tw is preferably smaller than 1.6 ⁇ tb. Therefore, it is preferable that the plate thickness tw satisfies the following formula (2). 0.7 ⁇ tb ⁇ tw ⁇ 1.6 ⁇ tb (2)
- tb is the thickness (mm) of the base material portion
- tw is the thickness (mm) of the welded portion.
- Stainless steel (SUS316, SUS304, SUS310, SUS429) having a thickness of 2 mm on the inner surface of the tube, and low carbon low alloy steel (0.05 mass% C-0.3) having a thickness of 5 mm on the base material on the outer surface of the tube.
- Stainless steel clad steel sheet (mass% Si-1.2 mass% Mn-Fe) is used as a raw material, and the uncoiler, leveler, roll forming machine, electric seam welder, and sizer are arranged in this order to pass through the pipe making equipment.
- gas spraying is performed within or outside the scope of the present invention of the above-described embodiment in performing gas shielding to the welded part during electric resistance welding.
- the condition level and the amount of upset were changed as shown in Tables 1 and 2, and the measurement was performed to measure the thickness tb (mm) of the base metal part and the thickness tw (mm) of the ERW welded part.
- Measurement of the oxygen concentration of the contact portion, 90 ° flattening test of the weld, and the inner surface side was subjected to corrosion test by oxalic acid etching.
- 3 mass% hydrogen gas was used as reducing gas.
- the amount of upset by the squeeze roll is determined by measuring the outer peripheral length of the pipe before the squeeze roll, and then measuring the outer peripheral length of the pipe after welding with the squeeze roll and cutting the molten bead part on the outer surface. It was obtained by calculating.
- the thickness of the base metal part is determined by measuring the thickness of the pipe at 60 ° pitch in the circumferential direction of the pipe, that is, 60 °, 120 °, 180 °, 240 °, and 300 °, with the weld being 0 °, and averaging them. The value was obtained, and the thickness of the welded portion was obtained by measuring the thickness of the weld seam. In the corrosion test, those in which intergranular corrosion was not observed were accepted, and those in which intergranular corrosion was observed were rejected.
- the flat value h / D (h: flat crack height (mm), D: pipe outer diameter (mm)) of the welded portion is a digit compared to the comparative example. It has been confirmed that it has a welded portion that is reduced in difference, excellent in fracture characteristics, has a good welded portion shape, and maintains the corrosion resistance as stainless steel.
- Nozzle Shield gas spray nozzle
- Element tube edge heating start point Welding point 15 ERW steel pipe 20 Through direction 30 Elemental pipe circumferential direction
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- Mechanical Engineering (AREA)
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Abstract
Description
ここで、優れた溶接部の特性とは、破断特性に優れていること、溶接部の形状が良好であること、および耐食性に優れていることを主に指す。
[1] 低炭素低合金鋼とステンレス鋼からなるクラッド鋼が素材である電縫溶接ステンレスクラッド鋼管であって、電縫溶接ままで電縫溶接部の偏平特性が下記式(1)を満足することを特徴とする電縫溶接ステンレスクラッド鋼管。
記
h/D<0.3・・・(1)
ここで、h:偏平割れ高さ(mm)
D:管外径(mm)
記
0.7×tb < tw < 1.6×tb ・・・(2)
ここで、tb:母材部の板厚(mm)
tw:溶接部の板厚(mm)
記
0.01≦B/A≦10 ・・・(3)
(イ) 不活性ガス単独使用の場合:(G1) 窒素ガス、ヘリウムガス、アルゴンガスの何れか1種若しくはこれら2種以上の混合ガス
(ロ) 還元性ガス単独使用の場合:(G2) 水素ガス、一酸化炭素ガスの何れか1種若しくはこれら2種の混合ガス
(ハ) 不活性ガスと還元性ガスの混合ガス使用の場合:前記(G1)と(G2)の混合ガス
尚、特に、水素ガス及び/又は一酸化炭素ガスを含むガスを使用する場合、遺漏無き安全対策をとるべきことは云うまでも無い。
h/D<0.3 ・・・(1)
ここで、h:偏平割れ高さ(mm)、D:管外径(mm)である。
また、上記の偏平特性は、90°偏平試験により測定することができ、管を長さ300mmに切り出した後、管の真上を0°とした時に、管の90°位置に溶接部を設置して、偏平試験を行い、溶接部に割れが発生したときの偏平高さ(偏平割れ高さh)を管外径Dで割ることにより求める。
0.7×tb < tw < 1.6×tb ・・・(2)
ここで、tb:母材部の板厚(mm)、tw:溶接部の板厚(mm)である。
腐食試験では、粒界腐食が観察されなかったものを合格とし、粒界腐食が観察されたものを不合格とした。
1A ガス放出口
1C 中央層
1E 両端層
2 ガス配管
3 ガス調整器
5 シールドガス
6 大気巻き込み
10 素管(オープン管)
11 被溶接部(素管エッジ突合せ部)
12 素管エッジ部加熱起点
13 溶接点
15 電縫鋼管
20 通管方向
30 素管周方向
Claims (6)
- 低炭素低合金鋼とステンレス鋼からなるクラッド鋼が素材である電縫溶接ステンレスクラッド鋼管であって、電縫溶接ままで電縫溶接部の偏平特性が下記式(1)を満足する電縫溶接ステンレスクラッド鋼管。
記
h/D<0.3 ・・・(1)
ここで、h:偏平割れ高さ(mm)
D:管外径(mm) - 前記電縫溶接部の板厚twが下記式(2)を満足する請求項1に記載の電縫溶接ステンレスクラッド鋼管。
記
0.7×tb < tw < 1.6×tb ・・・(2)
ここで、tb:母材部の板厚(mm)
tw:電縫溶接部の板厚(mm) - 請求項1または2に記載の電縫溶接ステンレスクラッド鋼管の製造方法であって、前記電縫溶接時に、被溶接部を不活性ガスからなるシールドガスでガスシールドする電縫鋼管の素管被溶接部シールド方法を用いて、前記被溶接部に対し該被溶接部上端から5~300mm上方の位置に、素管周方向に対して3層に分割したガス放出口を配位したシールドガス吹付け用ノズルの前記ガス放出口から前記シールドガスを、前記3層のうちの中央層のガス放出口からのガス放出流速Bは、0.5~50m/sとし、残りの両端層のガス放出口からのガス放出流速A(m/s)は下記式(3)を満たす流速として、吹付ける電縫溶接ステンレスクラッド鋼管の製造方法。
記
0.01≦B/A≦10 ・・・(3) - 前記ガス放出口の形状は、寸法の通管方向成分である長さが30mm以上、寸法の素管エッジ突合せ方向成分である幅が5mm以上の矩形状である請求項3に記載の電縫溶接ステンレスクラッド鋼管の製造方法。
- 前記ガス放出口の全層合併した寸法の素管エッジ突合せ方向成分である幅Rは、前記ガス放出口の直下の被溶接部の端面間の最大間隔Wに対し、R/W>1.0、なる関係を満たす請求項3または4に記載の電縫溶接ステンレスクラッド鋼管の製造方法。
- 前記不活性ガスに代えて、還元性ガスを0.1質量%以上含有するガスとする請求項3~5の何れかに記載の電縫溶接ステンレスクラッド鋼管の製造方法。
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JP2016538826A JP6164368B2 (ja) | 2015-03-12 | 2016-02-18 | 電縫溶接ステンレスクラッド鋼管の製造方法 |
RU2017130543A RU2674372C1 (ru) | 2015-03-12 | 2016-02-18 | Стальная труба, плакированная нержавеющей сталью и полученная контактной сваркой, и способ ее получения |
CN201680014120.4A CN107405720B (zh) | 2015-03-12 | 2016-02-18 | 电阻焊不锈钢复合钢管及其制造方法 |
EP16761250.6A EP3269489B1 (en) | 2015-03-12 | 2016-02-18 | Electric resistance welded stainless clad steel pipe and method of manufacturing same |
US15/557,374 US20180243809A1 (en) | 2015-03-12 | 2016-02-18 | Electric resistance welded stainless clad steel pipe and method of manufacturing the same |
KR1020177024819A KR101955139B1 (ko) | 2015-03-12 | 2016-02-18 | 전봉 용접 스테인리스 클래드 강관 및 그 제조 방법 |
CA2973830A CA2973830C (en) | 2015-03-12 | 2016-02-18 | Electric-resistance-welded stainless clad steel pipe and method of manufacturing the same |
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WO2021187408A1 (ja) * | 2020-03-18 | 2021-09-23 | Jfeスチール株式会社 | 電縫鋼管、その製造方法および自動車用構造部材 |
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Also Published As
Publication number | Publication date |
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EP3269489A4 (en) | 2018-05-02 |
KR20170109059A (ko) | 2017-09-27 |
EP3269489B1 (en) | 2022-04-27 |
RU2674372C1 (ru) | 2018-12-07 |
CN107405720A (zh) | 2017-11-28 |
CA2973830A1 (en) | 2016-09-15 |
CA2973830C (en) | 2019-10-22 |
US20180243809A1 (en) | 2018-08-30 |
JP6164368B2 (ja) | 2017-07-19 |
EP3269489A1 (en) | 2018-01-17 |
KR101955139B1 (ko) | 2019-03-06 |
CN107405720B (zh) | 2019-11-29 |
JPWO2016143271A1 (ja) | 2017-04-27 |
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