WO2013094204A1 - 帯状金属板 - Google Patents
帯状金属板 Download PDFInfo
- Publication number
- WO2013094204A1 WO2013094204A1 PCT/JP2012/008145 JP2012008145W WO2013094204A1 WO 2013094204 A1 WO2013094204 A1 WO 2013094204A1 JP 2012008145 W JP2012008145 W JP 2012008145W WO 2013094204 A1 WO2013094204 A1 WO 2013094204A1
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- WIPO (PCT)
- Prior art keywords
- strip
- shaped metal
- metal plate
- longitudinal direction
- thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/24—Automatic variation of thickness according to a predetermined programme
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/083—Supply, or operations combined with supply, of strip material
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2205/00—Particular shaped rolled products
- B21B2205/02—Tailored blanks
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- 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
- Y10T428/12389—All metal or with adjacent metals having variation in thickness
Definitions
- the present invention relates to a tubular metal plate and a strip-shaped metal plate made of a material such as an iron material or an aluminum material suitable for manufacturing the tube.
- a pipe tube.
- a hot-rolled steel sheet is manufactured by performing a rolling process so that fluctuations in the plate thickness along the longitudinal direction become as small as possible in one coil (one hot-rolled sheet).
- the plate thickness is constant and a belt-like plate.
- the hot-rolled steel sheet may be subjected to pickling after hot-rolling as necessary.
- a hot-rolled steel sheet or a hot-rolled steel sheet slit in the longitudinal direction is referred to as “band steel”.
- An example of a place where such a steel strip is used is an oil well cleaning pipe.
- the oil well cleaning pipe is manufactured by sequentially welding and joining a plurality of pipes made from the steel strip or by joining the steel strips together by welding.
- This oil well cleaning pipe is usually manufactured with a smaller diameter and a thinner wall toward the tip. The reason for manufacturing in this way is mainly to reduce the suspended mass.
- the oil well cleaning pipe is transported to the site while being wound on a reel, and is appropriately rewound and wound up at the site.
- the steel plate described in Patent Document 2 is a thick steel plate that is not wound in a coil shape, and is not a steel plate used as a coil or a strip steel. That is, it is different from the band-shaped metal plate on which the present invention is based.
- the tail end portion since the rate of change in the plate thickness is constant, the tail end portion (thin plate side) depends on the length of the rolled plate even if the thickness of the tip portion (thick plate side) is the same.
- the plate thickness is different.
- the steel pipe does not have a step in the connecting portion, and it is possible to eliminate the steep portion of the change in thickness over the entire longitudinal direction of the long steel pipe.
- the present invention has been made by paying attention to the above points, and provides a strip-shaped metal plate for a tube that can reduce the mass of the tube while ensuring the strength against a joint that is likely to be the weakest in structure. It is an object.
- the present invention has been completed based on the above findings, and the gist thereof is as follows.
- a strip-shaped rolled metal plate formed by rolling A strip-shaped metal plate in which the thickness of the tip and tail ends, which are both ends in the longitudinal direction, is thicker than the thickness of the intermediate portion other than both ends in the longitudinal direction.
- the belt-shaped metal plate includes both longitudinal end portions, a longitudinal intermediate portion located between the longitudinal end portions, and two inclined portions that connect each longitudinal end portion and the longitudinal intermediate portion.
- the strip-shaped metal plate according to [1] in which the two inclined portions continuously and monotonously decrease in thickness from the longitudinal end portion toward the longitudinal intermediate portion.
- At least one of the two end portions constituting the longitudinal end portions of the strip-shaped metal plate has a plate thickness continuously monotonously decreasing from the end surface toward the connecting inclined portion,
- A the maximum plate thickness at the end in the longitudinal direction
- B the minimum plate thickness at the midway in the longitudinal direction
- ((AB) / A) is a strip-shaped metal plate according to [2] or [3], wherein the ratio is 7% or more and 50% or less.
- the inclined portion is any one of [2] to [4], wherein a rate of change of the plate thickness along the longitudinal direction is 0.001 [mm / m] or more and 0.1 [mm / m] or less.
- [6] The band-shaped metal plate according to any one of [2] to [5], wherein a ratio of a maximum deviation of the plate thickness along the longitudinal direction of the band-shaped metal plate to a plate thickness is 5% or less.
- strip-shaped metal plate according to any one of [1] to [7], wherein the strip-shaped metal plate is a strip-shaped metal plate having a plate thickness of 1.0 to 8.0 mm and a total length of 80 to 1000 m.
- the material of the strip-shaped metal plate is not particularly limited, but examples thereof include steel materials and aluminum materials.
- the entire tube body It is possible to increase the strength of both end portions in the longitudinal direction to be the joint portion while reducing the mass of the material. As a result, it is possible to provide a band-shaped metal plate that can reduce the mass of the tube while ensuring the strength of the joint that is likely to be the weakest part in the structure.
- FIG. 1 is a schematic perspective view showing an example of a strip-shaped metal plate of the present embodiment.
- the dimensions in the longitudinal direction (rolling direction) are greatly compressed.
- (Configuration of strip metal plate) steel will be described as an example of the material of the band-shaped metal plate.
- the material of the strip-shaped metal plate is not limited to steel, and the present invention is not limited to any material as long as it is a metal material that can be hot-rolled, such as aluminum and copper.
- the strip-shaped metal plate L of the present embodiment has a longitudinal intermediate portion 2 located between the distal end portion 1 a and the tail end portion 1 b constituting the longitudinal end portions 1 and the longitudinal end portions 1. And two inclined portions 3 respectively connecting the end portions 1a and 1b in the longitudinal direction and the midway portion 2 in the longitudinal direction.
- the profile of the belt-shaped metal plate L is formed into a target plate thickness shape by hot rolling (hot rolling), and is wound up by a winder to form a coil.
- the pickling process may be performed with respect to the coil after rolling as needed.
- the length of such a band-shaped metal plate L is, for example, in the range of 50 m to 2500 m.
- the strip-shaped metal plate L is manufactured by rolling so as to have a preset plate thickness in a range of, for example, 1.0 mm to 30.0 mm.
- both the plate thicknesses of the longitudinal direction both end portions 1 are set to be thicker than the plate thicknesses of the longitudinal intermediate portion 2 and the inclined portion 3.
- the midway portion 2 and the inclined portion 3 in the longitudinal direction are intermediate portions other than the longitudinal end portions 1.
- the plate thickness of the midway portion 2 in the longitudinal direction is set constant or substantially constant along the longitudinal direction
- the plate thickness of the inclined portion 3 is midway in the longitudinal direction from the longitudinal end portion.
- It is a hot-rolled steel sheet that is set so as to become gradually thinner toward the end of the part 2 and is manufactured by the rolling.
- the pickling process may be performed after hot rolling.
- the ratio of ((AB) / A) is 7% or more and 50% or less.
- belt-shaped metal plate L is set.
- the ratio of ((AB) / A) is referred to as a plate thickness deviation in this specification.
- the plate thickness at both ends 1 in the longitudinal direction is constant, the plate thickness itself at both ends 1 in the longitudinal direction is A, but the plate thickness at both ends 1 in the longitudinal direction changes as shown in FIG. In this case, the maximum plate thickness (the plate thickness at the end face in FIG.
- the midway part 2 in the longitudinal direction constitutes the main body (body) of the strip-shaped metal plate L, that is, the main body of the tubular body when the pipe is formed.
- the plate thickness of the midway portion 2 in the longitudinal direction is designed based on the material of the strip-shaped metal plate L, the diameter of the tubular body, and the like so that the strength required for the intended use can be ensured.
- the bonding strength at the longitudinal end portion serving as the bonding portion with reference to the strength of the longitudinal intermediate portion 2 is the strength at the longitudinal intermediate portion 2, particularly the longitudinal length in the vicinity of the target longitudinal end portion.
- the strength of the structure can be evaluated by, for example, the value of the moment of inertia of the cross section. Therefore, the improvement in strength is effective by the square of the thickness.
- the plate thickness deviation is set to 7% or more and 50% or less.
- the thickness is less than 7%, the effect of reducing the weight is low and the effect of improving the bonding strength at the connection portion is low. It was.
- it is larger than 50%, there is a possibility of contributing to weight reduction, but the strength difference between the strength in the midway portion 2 in the longitudinal direction and the joint strength at the connecting portion becomes large, so that buckling is prevented. From the viewpoint of the above, it was made 50% or less.
- the plate thickness deviation is preferably 10% or more and 30% or less. It should be noted that the intensity change along the longitudinal direction should be kept small.
- the amount of change in the thickness along the longitudinal direction of the inclined portion 3 is set in a range of 0.001 [mm / m] to 0.1 [mm / m].
- the upper limit of the change of the inclined portion 3 is set to 0.1 [mm / m] for the following reason.
- the amount of change in the longitudinal direction increases, the strength change along the longitudinal direction increases and the risk of buckling increases. From this viewpoint, if the change is 0.1 [mm / m] or less, the risk of buckling can be reduced.
- the lower limit of the change is set to 0.001 [mm / m] because the smaller the change amount, the longer the middle part 2 in the longitudinal direction that constitutes the main body of the strip-shaped metal plate L and the pipe body after pipe making. This is because the length is shortened and the effect of weight reduction is reduced accordingly. For this reason, the lower limit was set to 0.001 [mm / m] or more.
- the strip-shaped metal plate of the present invention has a thick end in the longitudinal direction at the product stage.
- the strip-shaped metal plate L is cut as it is or into a slit having a desired width to obtain a strip steel.
- the steel strip is made into a tubular body.
- the ends of the plurality of pipes are sequentially connected by butt welding to form a long pipe.
- a long tube is manufactured by forming the steel strip into a tubular body while sequentially joining the steel strips by welding.
- a conventional pipe manufacturing method may be adopted as a method for manufacturing the long pipe. For example, while rolling the steel strip in a coil by roll forming, it is formed into U-shape or O-shape by roll in order, and both ends in the width direction are continuously welded and closed to O-shape.
- the tube is continuously manufactured.
- a long tube is manufactured by sequentially adding and welding the tail end of the preceding coil and the tip of the next coil.
- FIG.4 (a) is a typical side view at the time of welding the said strip-shaped strip steel sequentially based on this embodiment.
- Fig. 4 (b) shows the case where the plate thickness of the end is the same as the end of the strip shown in Fig. 4 (a), and the strips of the same plate thickness are used in the longitudinal direction and joined together by welding. It is a figure of a comparative example.
- the tube diameter is determined by the width of the steel strip, but the thickness of the tube is determined by the plate thickness.
- the joint strength between the tubular bodies is secured as in the comparative example. It can be seen that the tube body (longitudinal portion 2 in the longitudinal direction) is thin and can be reduced in weight. At this time, in the steel strip of the present embodiment, the thickness of the midway portion 2 in the longitudinal direction may be set to a plate thickness that can ensure the strength required for the target pipe.
- the thickness of the connecting portion in the longitudinal direction 2 to be connected is gradually reduced, so that the thickness is reduced toward the tip, that is, lighter toward the tip. It becomes possible to do. Even in this case, if the plate thicknesses at both ends 1 in the longitudinal direction are the same, the steel strips can be butt-welded with no difference or small steps even if the thickness of the midway portion 2 in the longitudinal direction is different. It becomes.
- each tube can be reduced in weight, and therefore it is not necessary to make the long tube have a smaller diameter toward the tip.
- each strip-shaped metal plate serving as a tubular body is the same.
- board thickness along the longitudinal direction of the longitudinal direction middle part 2 illustrated the case where it was constant or substantially constant
- the board thickness along the longitudinal direction of the longitudinal direction middle part 2 is constant.
- the longitudinal intermediate portion 2 may be formed so that the plate thickness gradually decreases, for example, with a constant gradient from the front end side to the tail end side.
- the amount of change in the plate thickness along the longitudinal direction is preferably 0.1 [mm / m] or less. This is to suppress the occurrence of buckling due to an increase in the strength change along the longitudinal direction as described above.
- the edge parts of a some strip steel are weld-joined, and as structures, such as a long beam Also good. Even in this case, since the plate thickness is thin except for the welded portion, it is possible to reduce the structure while securing the welded portion strength that is the weakest portion in the structure. However, the present invention is more effective especially when provided for a long tube.
- the long pipe is not limited to the oil well washing pipe.
- a long tube may be applied to a beam or a column.
- each strip metal plate A to I were manufactured with a material of AP1 5ST (tensile strength on a hot steel plate: equivalent to 600 to 700 MPa), and manufactured with the following dimensions.
- the length X of the band-shaped metal plate was 100 m, and the plate width was 1000 mm.
- belt-shaped metal plate of this embodiment is manufactured on the following conditions. That is, a steel sheet having the following composition is hot-rolled to form a strip-shaped metal plate. At this time, the temperature after hot finish rolling is set to a temperature in the range of 820 to 920 ° C., and the winding temperature is set to 550 to 620 ° C. The temperature was set in the range of.
- Strip metal plate C Longitudinal end length x1: 1.0m Thickness t1: 5.18mm Midway in the longitudinal direction Length x2: 84m Plate thickness t2: 4.45 mm Inclined part 3 Length x3: 7m
- Strip metal plate G Longitudinal end length x1: 0.0m
- Thickness t1 5.18mm Midway in the longitudinal direction
- Length x2 80m
- Strip metal plate H Longitudinal end length x1: 0.0m Thickness t1: 5.18mm Midway in the longitudinal direction Length x2: 80m Plate thickness t2: 4.93 mm Inclined part 3 Length x3: 10m
- Strip metal plate I Longitudinal end length x1: 0.0m Thickness t1: 5.18mm Longitudinal midway part 2
- strip metal plates D, E, and F were manufactured using the same material as described above as a strip metal plate of a comparative example in which the plate thickness in the longitudinal direction did not change.
- the thickness of each strip-shaped metal plate is as follows.
- the tensile strength ratio that is, the fatigue strength ratio is decreased. That is, generally, the tensile strength ratio (fatigue strength ratio) and the weight reduction rate are in a trade-off relationship.
- belt-shaped metal plates A and G based on this invention can achieve weight reduction significantly, without dropping a tensile strength ratio (fatigue strength ratio).
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Abstract
Description
なお、本明細書では、2以上の管体を直列に接合したものを管と呼ぶ。
このような問題点に対する従来技術として、例えば特許文献1に記載の帯鋼がある。この特許文献1に記載の帯鋼は、長手方向の板厚が一定勾配で変化した帯鋼である。すなわち、長手方向一端部から他端部に向けて一定比率で徐々に板厚が薄くなる帯鋼が記載されている。
なお、長手方向で板厚が異なる鋼板としては、特許文献2に記載の鋼板もある。しかし、特許文献2に記載の鋼板は、コイル状に巻くことが無い厚板鋼板であって、コイルや帯鋼として使用される鋼板ではない。すなわち、本願発明が前提とする帯状金属板とは異なるものである。
また、上記鋼管は、接続部に段差が形成されず、長尺の鋼管の長手方向全体に亘って肉厚の変化の急峻部を無くすことは可能であるものの、同じ肉厚であっても接続部が構造的に強度が弱いことから、長尺の上記管に対し巻戻し・巻取り作業を繰り返し実施すると、接続部に段差が形成されている場合よりは長寿命ではあるが、やはり接続部からの割れが発生するといった課題があった。
本発明は、上記のような点に着目してなされたもので、構造上最弱部となりやすい接合部に対する強度を確保しつつ、管の質量を軽減可能な管用の帯状金属板を提供することを目的としている。
[1]圧延で形成された帯状の圧延金属板であって、
長手方向両端部である先端部及び尾端部の板厚が、ともに長手方向両端部以外の中間部分の板厚に比べて厚い帯状金属板。
[2]前記帯状金属板は、長手方向両端部、その長手方向両端部の間に位置する長手方向中途部、及び長手方向の各端部と前記長手方向中途部とを接続する2つの傾斜部とから構成され、該2つの傾斜部は、長手方向端部から長手方向中途部に向けて板厚が連続的に単調減少する、[1]に記載した帯状金属板。
[3]前記帯状金属板の長手方向両端部を構成する2つの端部のうちの少なくとも一方の端部は、端面から前記接続する傾斜部に向けて板厚が連続的に単調減少し、該連続的に単調減少する長手方向に沿った変化率が前記傾斜部において板厚が単調減少する変化率よりも小さい、[2]に記載した帯状金属板。
[4]前記帯状金属板の長手方向に沿った板厚において、長手方向端部の最大板厚をA、長手方向中途部の最小板厚をBと定義したときに、((A-B)/A)の比率が、7%以上50%以下である、[2]又は[3]に記載した帯状金属板。
[5]前記傾斜部は、長手方向に沿った板厚の変化率が0.001[mm/m]以上0.1[mm/m]以下である、[2]~[4]のいずれか1項に記載した帯状金属板。
[6]前記帯状金属板の長手方向に沿った板厚の最大偏差の板厚に対する比が5%以下である、[2]~[5]のいずれか1項に記載した帯状金属板。
[7]前記帯状金属板が、熱間圧延によって成形される、[1]~[6]のいずれか1項に記載した帯状金属板。
[8]前記帯状金属板が、板厚1.0~8.0mm、板全長80~1000mの帯状金属板である、[1]~[7]のいずれか1項に記載した帯状金属板。
ここで、帯状金属板の材質は、特に限定は無いが、鋼材やアルミ材などが例示できる。
この結果、構造上最弱部となりやすい接合部の強度を確保しつつ、管の質量を軽減することが可能な帯状金属板を提供可能となる。
図1は、本実施形態の帯状金属板の例を示す模式的斜視図である。なお、いずれの図においても長手方向(圧延方向)の寸法を大幅に圧縮して図示している。
(帯状金属板の構成)
以下の説明では、帯状金属板の材質として鋼を例に挙げて説明する。但し、帯状金属板の材質は、鋼に限定されず、アルミ、銅など、熱間圧延が可能な金属材料であれば、本願発明は材料に制限は無い。
本実施形態の帯状金属板Lは、長手方向中途部2の板厚が、長手方向に沿って一定若しくは略一定に設定され、上記傾斜部3の板厚が、長手方向端部から長手方向中途部2の端部に向けて徐々に薄くなるように設定されて、上記圧延で製造された熱延鋼板である。なお、熱延後に酸洗処理が施されていても良い。
なお、図3のように、長手方向の先端部1a及び尾端部1bの各最大板厚は同一である必要はなく、長手方向の各端部1a、1bの最大板厚がそれぞれ上記条件を満足するように設定する。
ここで、構造体の強度は、例えば断面二次モーメントの値で評価できるので、強度の向上は、厚さの二乗で効いてくる。
傾斜部3の変化の上限を0.1[mm/m]としたのは次の理由である。長手方向の変化量が大きくなるほど、長手方向に沿った強度変化が大きくなり、座屈が発生する危険性が増大する。この観点から、変化が0.1[mm/m]以下であれば、その座屈の危険性を小さく抑えられるからである。
ここで、熱間圧延で端部のみ厚く形成することがあっても、酸洗、スリット等でその厚くした端部を除去した帯状金属板は、本願発明の帯状金属板では無い。本願発明の帯状金属板は、製品の段階で、長手方向端部が厚くなっている。
上記帯状金属板Lをそのまま、若しくは目的の幅のスリットとなるように切断して帯鋼とする。
その帯鋼を製管して管体とする。そして複数の管体の端部同士を突合せ溶接にて順次接続して長尺の管とする。
または、上記帯鋼を順次、溶接にて接合しつつ管体に製管することで、長尺の管を製造する。この長尺の管の製造方法は、従来の製管方法を採用すればよい。例えばロールフォーミングによって、コイルになっている帯鋼を巻き戻しながら、順次ロールによって、U字状更にはO字状に成型し、且つ幅方向両端部を連続的に溶接してO字状に閉じて、連続的に管を製造する。このとき先行のコイルの尾端部と次のコイルの先端部とを順次継ぎ足し溶接することで、長尺の管を製造する。
図4(a)は、本実施形態に基づき、上記板厚形状の帯鋼を順次溶接した場合の模式的側面図である。図4(b)は、端部の板厚が図4(a)の帯鋼の端部と同じ板厚として、長手方向で同一板厚の帯鋼を使用して順次溶接で接合した場合の比較例の図である。
ここで、上記帯鋼をO字状に成型して管体とすると、帯鋼の幅で管径が決定されるものの、板厚で管の肉厚が決定される。図4の(a)と(b)との比較から分かるように、本実施形態(図4(a)参照)では、管体同士の接合部では、比較例と同様の接続強度を確保しつつ、管体の本体(長手方向中途部2)が薄肉になって軽量化が図れることが分かる。なおこのとき、本実施形態の帯鋼にあっては、長手方向中途部2の厚さを、対象とする管に要求される強度を確保可能な板厚に設定すればよい。
これによって溶接による接合部も含め、管の長手方向に沿った強度変化を小さく抑えつつ管全体の軽量化を図ることが可能となる。
ここで、上記実施形態では、長手方向中途部2の長手方向に沿った板厚が一定若しくは略一定の場合を例示したが、長手方向中途部2の長手方向に沿った板厚は一定である必要はない。長手方向中途部2について、例えば図5のように、先端側から尾端側に向けて徐々、例えば一定勾配で板厚が薄くなるよう形成されていても良い。長手方向中途部2の長手方向に沿った板厚が変化する場合、長手方向に沿った板厚の変化量は、0.1[mm/m]以下が好ましい。これは、上述のように、長手方向に沿った強度変化が大きくなることによる、座屈発生を抑えるためである。
帯状金属板A~Iを、AP1 5ST(熱鋼板での引張強度:600~700MPa相当)の材質で製造して、次の寸法で製造してみた。帯状金属板の長さXを100mとし、板幅を1000mmとした。
なお、本実施形態の各帯状金属板は、次の条件で製造したものである。すなわち、下記組成の鋼を熱間圧延して帯状金属板とし、その際に、熱間仕上圧延終了後温度を820~920℃の範囲の温度に設定し、かつ巻取り温度を550~620℃の範囲の温度に設定した。
長手方向端部
長さx1:1.0m
板厚t1:5.18mm
長手方向中途部
長さx2:78m
板厚t2:4.45mm
傾斜部3
長さx3:10m
帯状金属板B
長手方向端部
長さx1:1.0m
板厚t1:5.18mm
長手方向中途部
長さx2:78m
板厚t2:4.93mm
傾斜部3
長さx3:10m
長手方向端部
長さx1:1.0m
板厚t1:5.18mm
長手方向中途部
長さx2:84m
板厚t2:4.45mm
傾斜部3
長さx3: 7m
帯状金属板G
長手方向端部
長さx1:0.0m
板厚t1:5.18mm
長手方向中途部
長さx2:80m
板厚t2:4.45mm
傾斜部3
長さx3: 10m
長手方向端部
長さx1:0.0m
板厚t1:5.18mm
長手方向中途部
長さx2:80m
板厚t2:4.93mm
傾斜部3
長さx3:10m
帯状金属板I
長手方向端部
長さx1:0.0m
板厚t1:5.18mm
長手方向中途部2
長さx2:86m
板厚t2:4.45mm
傾斜部3
長さx3: 7m
金属帯状板D:4.45mm
金属帯状板E:4.93mm
金属帯状板F:5.18mm
ここで、帯状金属板A、Gは、(5.18-4.45)/5.18=0.14すなわち、長手方向の板厚偏差は14%である。また、傾斜部3の長手方向変化量は(5.18-4.45)/10=0.073[mm/m]となっている。
帯状金属板C、Iは、(5.18-4.45)/5.18=0.14すなわち、長手方向の板厚偏差は14%である。一方、傾斜部3の長手方向変化量は(5.18-4.45)/7=0.104mm/mとなっている。
そして、溶接接合部及び板厚変化部を切出して試験片とし、その試験片に対し引張試験を実施した。このとき、試験片についてはJIS5号、試験方法についてはJISZ2201にそれぞれ準拠して、試験を実施した。
一般的に、引張強度は材料の疲労強度と相関がある。このため、引張強度比を疲労強度比とみなすことが出来る。
その結果を、表1に示す。
一方、帯状金属帯B、Hを使用した場合には、帯状金属板Fと同じ引張強度比を確保できるものの、帯状金属板A、Gほどの軽量化を図ることが出来ない。
また、帯状金属帯C,Iを使用した場合には、帯状金属板A、Gと同程度の軽量化を図ることが出来るものの、帯状金属帯A,G,Fよりも引張強度比が低い、つまり疲労強度比が低くなってしまう。
以上のように、本発明の範囲を満足する帯状金属板Lで長尺の管を形成すると、軽量化を図りつつ、寿命の向上を図ることが可能となることが分かる。
1a 先端部
1b 尾端部
2 長手方向中途部
3 傾斜部
L 帯状金属板
Claims (8)
- 圧延で形成された帯状の圧延金属板であって、
長手方向両端部である先端部及び尾端部の板厚が、ともに長手方向両端部以外の中間部分の板厚に比べて厚い帯状金属板。 - 前記帯状金属板は、長手方向両端部、その長手方向両端部の間に位置する長手方向中途部、及び長手方向の各端部と前記長手方向中途部とを接続する2つの傾斜部とから構成され、該2つの傾斜部は、長手方向端部から長手方向中途部に向けて板厚が連続的に単調減少する、請求項1に記載した帯状金属板。
- 前記帯状金属板の長手方向両端部を構成する2つの端部のうちの少なくとも一方の端部は、端面から前記接続する傾斜部に向けて板厚が連続的に単調減少し、該連続的に単調減少する長手方向に沿った変化率が前記傾斜部において板厚が単調減少する変化率よりも小さい、請求項2に記載した帯状金属板。
- 前記帯状金属板の長手方向に沿った板厚において、長手方向端部の最大板厚をA、長手方向中途部の最小板厚をBと定義したときに、((A-B)/A)の比率が、7%以上50%以下である、請求項2又は請求項3に記載した帯状金属板。
- 前記傾斜部は、長手方向に沿った板厚の変化率が0.001[mm/m]以上0.1[mm/m]以下である、請求項2~請求項4のいずれか1項に記載した帯状金属板。
- 前記帯状金属板の長手方向に沿った板厚の最大偏差の板厚に対する比が5%以下である、請求項2~請求項5のいずれか1項に記載した帯状金属板。
- 前記帯状金属板が、熱間圧延によって成形される、請求項1~請求項6のいずれか1項に記載した帯状金属板。
- 前記帯状金属板が、板厚1.0~8.0mm、板全長80~1000mの帯状金属板である、請求項1~請求項7のいずれか1項に記載した帯状金属板。
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