WO2011145740A1 - Joint soudé qui présente une excellente résistance à la corrosion et cuve de pétrole brut - Google Patents

Joint soudé qui présente une excellente résistance à la corrosion et cuve de pétrole brut Download PDF

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Publication number
WO2011145740A1
WO2011145740A1 PCT/JP2011/061699 JP2011061699W WO2011145740A1 WO 2011145740 A1 WO2011145740 A1 WO 2011145740A1 JP 2011061699 W JP2011061699 W JP 2011061699W WO 2011145740 A1 WO2011145740 A1 WO 2011145740A1
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mass
corrosion
steel
crude oil
less
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PCT/JP2011/061699
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English (en)
Japanese (ja)
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之郎 釣
務 小森
博幸 角
健次 大井
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Ｊｆｅスチール株式会社
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Priority to KR1020127029428A priority Critical patent/KR101240743B1/ko
Priority to CN201180024271.5A priority patent/CN102892914B/zh
Publication of WO2011145740A1 publication Critical patent/WO2011145740A1/fr

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    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/18—Submerged-arc welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/08—Interconnections of wall parts; Sealing means therefor
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • 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
    • 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • B23K2101/12—Vessels
    • 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 a crude oil tanker oil tank (oil tank) formed by welding steel materials or a tank for transporting or storing crude oil (hereinafter referred to as a crude oil tank).
  • a crude oil tank formed by welding steel materials or a tank for transporting or storing crude oil (hereinafter referred to as a crude oil tank).
  • the steel materials used in the crude oil tank of the present invention include thick steel plate, thin steel sheet, and shaped steel.
  • the steel used for the bottom plate of a tanker's crude oil tank, etc. has the effect of inhibiting the corrosion of the crude oil itself and the corrosion of a protective coating (oil coating) derived from the crude oil formed on the inner surface of the crude oil tank. It was thought that corrosion did not occur due to the suppression action (corrosion suppression action). However, recent studies have revealed that bowl-shaped local corrosion (pitting corrosion) occurs in the steel plate of the tank bottom plate.
  • the most effective method for preventing the above-described general corrosion and local corrosion is to apply a heavy coating to the surface of the steel material to shield the steel material from the corrosive environment.
  • the painting operation of crude oil tanks requires an enormous area to be applied, and the paint film must be repainted once every 10 years due to the deterioration of the coating film. To do.
  • corrosion is promoted on the damaged part of the heavy-painted coating film in the corrosive environment of the crude oil tank.
  • Patent Document 1 For the corrosion problem as described above, several techniques for improving the corrosion resistance of the steel material itself in the corrosive environment of the crude oil tank have been proposed. For example, in Patent Document 1, in mass%, C: 0.001 to 0.2%, Si: 0.01 to 2.5%, Mn: 0.1 to 2%, P: 0.03% or less, S: 0.02% or less, Cu: 0.01 to 1.5%, Al: 0.001 to 0.3%, N: 0.001 to 0.01%, and Mo: 0.001%.
  • Patent Document 2 in mass%, C: 0.001 to 0.2%, Si: 0.01 to 2.5%, Mn: 0.1 to 2%, P: 0.03% or less , S: 0.02% or less, Cu: 0.01 to 1.5%, Al: 0.001 to 0.3%, N: 0.001 to 0.01%, and Mo: 0
  • C 0.001 to 0.2%
  • Si 0.01 to 2.5%
  • Mn 0.1 to 2%
  • P 0.03% or less
  • S 0.02% or less
  • Cu 0.01 to 1.5%
  • Al 0.001 to 0.3%
  • N 0.001 to 0.01%
  • Mo 0
  • Patent Document 1 and Patent Document 2 described above contain Cu as an essential element for improving corrosion resistance
  • the addition of Cu causes surface cracks during hot rolling, so that production stability is improved. Have the problem of harming.
  • an object of the present invention is to provide general corrosion resistance in a crude oil tank such as a tanker oil tank formed by welding a steel material having excellent manufacturability without causing problems such as cracking during hot rolling.
  • Another object of the present invention is to provide a welded joint having excellent local corrosion resistance and a crude oil tank having the welded joint.
  • the inventors have intensively studied to solve the above problems. As a result, when forming a crude oil tank by welding steel materials with improved corrosion resistance by controlling the component composition of steel, the content of Cu, Mo and W contained in the weld metal of the welded joint is within the proper range. It has been found that by controlling to the above, it is possible to remarkably reduce the general corrosion and local corrosion generated in the welded joint of the crude oil tank, and the present invention has been completed.
  • the steel material used for the welded joint of the present invention further contains at least one component of the following groups A to D.
  • Group A Ni: 0.005 to 0.4 mass% and Co: 0.01 to 0.4 mass% or one selected from Group B; Nb: 0.001 to 0.1 mass%, Ti : 0.001 to 0.1 mass%, Zr: 0.001 to 0.1 mass%, and V: 0.002 to 0.2 mass%, one or more C groups; Ca: 0.0002 ⁇ 0.01 mass%, REM: 0.0002 to 0.015 mass%, and Y: 0.0001 to 0.1 mass%, one or more D groups; B: 0.0002 to 0.003 mass %
  • the present invention is a crude oil tank having the above-mentioned weld joint.
  • the overall corrosion and local corrosion generated in a crude oil tank formed by welding such as an oil tank of a crude oil tanker or a tank for transporting or storing crude oil, can be observed in all parts including not only steel plates but also welded joints. Since it can be suppressed, it has a remarkable industrial effect.
  • Example of this invention it is a figure explaining the test apparatus used for the general corrosion test. In the Example of this invention, it is a figure explaining the test apparatus used for the pitting corrosion test. The influence (bottom plate and top plate) of the weld metal composition on the corrosion resistance of the welded joint of the corrosion resistant steel for tankers is shown.
  • C 0.03-0.16 mass%
  • C is an element that enhances the strength of steel.
  • 0.03 mass% or more is added in order to secure a desired strength.
  • addition exceeding 0.16 mass% lowers the weldability and the toughness of the welded heat affected zone. Therefore, C is set to a range of 0.03 to 0.16 mass%. A range of 0.06 to 0.16 mass% is more preferable.
  • Si 0.05-1.50 mass%
  • Si is an element added as a deoxidizer, but is also an effective element for increasing the strength of steel. Therefore, in the present invention, 0.05 mass% or more is added in order to ensure a desired strength. However, addition exceeding 1.50 mass% reduces the toughness of steel. Therefore, Si is set to a range of 0.05 to 1.50 mass%. A range of 0.15 to 0.50 mass% is more preferable.
  • Mn 0.1 to 2.0 mass%
  • Mn is an element that increases the strength of steel, and in the present invention, 0.1 mass% or more is added in order to obtain a desired strength. On the other hand, addition exceeding 2.0 mass% reduces the toughness and weldability of steel. Therefore, Mn is in the range of 0.1 to 2.0 mass%. From the viewpoint of maintaining high strength and suppressing the formation of inclusions that deteriorate the corrosion resistance, a range of 0.5 to 1.6 mass% is preferable, and a range of 0.7 to 1.4 mass% is more preferable. preferable.
  • P 0.025 mass% or less
  • P is a harmful element that segregates at the grain boundaries and lowers the toughness of the steel, and is desirably reduced as much as possible. In particular, if added over 0.025 mass%, the toughness is greatly reduced. Moreover, when P is added exceeding 0.025 mass%, it will also have a bad influence on the corrosion resistance in a tank oil tank. Therefore, P is set to 0.025 mass% or less. Preferably it is 0.015 mass% or less.
  • S 0.010 mass% or less
  • S is a harmful element that forms MnS, which is a non-metal inclusion, and becomes a starting point of local corrosion, and reduces local corrosion resistance. Is desirable. In particular, addition exceeding 0.010 mass% leads to a significant decrease in local corrosion resistance. Therefore, the upper limit of S is 0.010 mass%. Preferably, it is 0.005 mass% or less.
  • Al 0.005 to 0.10 mass%
  • Al is an element added as a deoxidizer, and 0.005 mass% or more is added in the present invention. However, if added in excess of 0.10 mass%, the toughness of the steel decreases, so the upper limit of Al is 0.10 mass%. Preferably, it is in the range of 0.01 to 0.05 mass%. A range of 0.02 to 0.04 mass% is more preferable.
  • N 0.008 mass% or less
  • N is a harmful element that lowers toughness, and is desirably reduced as much as possible.
  • the toughness is greatly lowered, so the upper limit is made 0.008 mass%.
  • it is 0.006 mass% or less, More preferably, it is 0.004 mass% or less.
  • the above-mentioned effect is particularly remarkable in a portion that comes into contact with a liquid containing a high concentration of salt separated from a crude oil component, such as a bottom plate portion of a tanker oil tank, and a Zn-containing primer treatment is applied to the steel material in the above-mentioned portion containing Cr.
  • a Zn-containing primer treatment is applied to the steel material in the above-mentioned portion containing Cr.
  • the corrosion resistance can be remarkably improved as compared with a steel material not containing Cr.
  • addition of 0.1 mass% or less is not sufficient, while addition exceeding 0.5 mass% deteriorates the toughness of the weld. Therefore, Cr is in the range of more than 0.1 mass% and less than 0.5 mass%. A range of 0.11 to 0.3 mass% is more preferable. The range of 0.12 to 0.2 mass% is more preferable.
  • Cu 0.03-0.4 mass%
  • Cu is an element that increases the strength of the steel, and also exists in the rust generated by the corrosion of the steel and has the effect of increasing the corrosion resistance. These effects cannot be sufficiently obtained with addition of less than 0.03 mass%.
  • addition over 0.4 mass% saturates the effect of improving corrosion resistance and causes problems such as surface cracking during hot working. . Therefore, from the viewpoint of stably producing the steel material of the present invention, Cu needs to be added in the range of 0.03 to 0.4 mass%.
  • the range of 0.008 to 0.15 mass% is preferable from the viewpoint of cost effectiveness. A range of 0.01 to 0.14 mass% is more preferable.
  • the steel material of this invention needs to contain 1 type, or 2 or more types chosen from W, Mo, Sn, and Sb other than the said component in the following range.
  • W: 0.01 to 1.0 mass% W has the effect of suppressing pitting corrosion at the tanker tank bottom plate and the effect of suppressing overall corrosion of the tanker upper deck. The above effect is manifested by addition of 0.01 mass% or more. However, if it exceeds 1.0 mass%, the effect is saturated. Therefore, W is added in the range of 0.01 to 1.0 mass%. The range is preferably 0.01 to 0.5 mass%, more preferably 0.02 to 0.3 mass%.
  • W has the above-described effect of improving corrosion resistance
  • WO 4 2 ⁇ is generated in the rust generated as the steel sheet corrodes, and the presence of this WO 4 2 ⁇ causes chloride ions ( chloride ion) can be suppressed from entering the surface of the steel sheet, further, in the site where pH is lowered such anode portion of the steel sheet surface (anode), generated by FeWO 4, the chloride ions by the presence of this FeWO 4 It is because the penetration
  • Mo 0.01 to 0.5 mass% Mo not only suppresses pitting corrosion on the bottom plate of the tanker oil tank, but also after the coating in a corrosive environment that repeats salt water immersion and high humidity like the ballast tank, as well as the overall corrosion resistance of the tanker backside. There is an effect of improving the corrosion resistance of.
  • the effect of Mo is manifested by addition of 0.01 mass% or more, but the effect is saturated when it exceeds 0.5 mass%. Therefore, Mo is in the range of 0.01 to 0.5 mass%. The range is preferably 0.02 to 0.5 mass%, more preferably 0.03 to 0.4 mass%.
  • Mo has the above-described effect of improving corrosion resistance is that, like W, MoO 4 2 ⁇ is generated in the rust generated along with corrosion of the steel sheet, and the presence of MoO 4 2 ⁇ causes chloride ions. This is thought to be because the penetration of steel into the steel sheet surface is suppressed.
  • Sn: 0.001 to 0.2 mass%, Sb: 0.001 to 0.4 mass% Sn and Sb have the effect of suppressing pitting corrosion on the tanker tank bottom plate and the effect of suppressing the overall corrosion of the tanker upper deck.
  • the above effects are manifested by the addition of Sn: 0.001 mass% or more and Sb: 0.001 mass% or more.
  • Sn: more than 0.2 mass% and Sb: more than 0.4 mass% are added, the effect is saturated.
  • Sn and Sb are preferably added in the above ranges.
  • the steel material of this invention contains 1 type or 2 types chosen from Ni and Co other than the said essential component in the following range.
  • Ni and Co have the effect of refining the generated rust particles to improve the corrosion resistance in the bare state and the corrosion resistance in the state where the epoxy primer is applied to the zinc primer. . Therefore, these elements are preferably added in an auxiliary manner when it is desired to further improve the corrosion resistance.
  • the above effects are manifested by adding Ni: 0.005 mass% or more and Co: 0.01 mass% or more.
  • Ni has an effect of suppressing surface cracks during hot working that occur in steel containing Cu or Sn. Therefore, Ni and Co are preferably added within the above ranges.
  • the element symbol in the above formula indicates the content (mass%) of the element, and the element not contained is calculated as 0 (zero). It is necessary to contain so that the X value defined by may satisfy 0.5 or less.
  • the above equation (1) is an equation for evaluating the influence of each component on the corrosion in the tanker oil tank, and the coefficient of the component that improves the corrosion resistance is expressed as negative, and the coefficient of the component that deteriorates the corrosion resistance is expressed as positive. Yes. Therefore, the steel material having a smaller value of X has better corrosion resistance.
  • the inventors have found that if X is 0.5 or less, the corrosion resistance in the corrosive environment in the tanker oil tank is reduced. Although it is excellent, it discovered that the said corrosion resistance deteriorated when X exceeded 0.5. Therefore, in determining the content of P, S, Cr, Cu, W, Mo, Sn, Sb, Ni and Co, the steel material of the present invention is designed so that the X value is 0.5 or less. There is a need.
  • the element symbol in the above formula indicates the content (mass%) of the element, and the element not contained is calculated as 0 (zero). It is necessary to contain so that the Z value defined by (1) may be 0.15 or less.
  • Cu is an element that causes surface cracking during hot working
  • Sn is an element that promotes cracking due to Cu.
  • Ni is an effective element for preventing the harmful effects of the above elements, but in order to exhibit the above effects of Ni, it is necessary to satisfy the above formula (2) and to add Ni. .
  • the steel material of the present invention may further contain one or more selected from Nb, Ti, V and Zr in the following range in addition to the above components. it can.
  • Nb 0.001 to 0.1 mass%
  • Ti 0.001 to 0.1 mass%
  • Zr 0.001 to 0.1 mass%
  • V 0.002 to 0.2 mass%
  • Nb, Ti, Zr and V are all elements that increase the strength of the steel material, and can be appropriately selected and added according to the required strength.
  • Nb, Ti, and Zr each 0.001 mass% or more, and V to add 0.002 mass% or more.
  • the toughness decreases, so Nb, Ti, Zr, V are added within the above ranges, respectively. Is preferred.
  • the steel material of the present invention further includes one or more selected from Ca, REM and Y in the following range in addition to the above components.
  • Ca 0.0002 to 0.01 mass%
  • REM 0.0002 to 0.015 mass%
  • Y 0.0001 to 0.1 mass%
  • Ca, REM, and Y are all effective in improving the toughness of the weld heat affected zone, and can be added as necessary.
  • the above effect can be obtained by adding Ca: 0.0002 mass% or more, REM: 0.0002 mass% or more, Y: 0.0001 mass% or more, but Ca: 0.01 mass%, REM: 0.015 mass%, Y: If added in excess of 0.1 mass%, the toughness is reduced, so Ca, REM, and Y are preferably added in the above ranges.
  • the steel material of this invention can contain B in the following range in addition to the said component.
  • B 0.0002 to 0.003 mass%
  • B is an element that increases the strength of the steel material, and can be added as necessary. In order to acquire the said effect, adding 0.0002 mass% or more is preferable. However, when it exceeds 0.003 mass%, toughness will fall. Therefore, B is preferably added in the range of 0.0002 to 0.003 mass%.
  • the steel material of the present invention is obtained by converting a steel adjusted to a component composition suitable for the present invention into a known refining process (steel converter, electric furnace, vacuum degassing equipment) or the like. It is melted using a refinery process and made into a steel material (slab slab) by continuous casting process or ingot-bundling rolling process. It is preferable that the steel material is rolled (hot rolled) to be a steel material such as a thick steel plate, a thin steel plate and a shaped steel.
  • the reheating temperature before the hot rolling is preferably 900 to 1200 ° C. If heating temperature is less than 900 degreeC, a deformation resistance is large and it will become difficult to hot-roll. On the other hand, when the heating temperature exceeds 1200 ° C., austenite grains are coarsened, resulting in a decrease in toughness, and a scale loss due to oxidation becomes significant, resulting in a decrease in yield ratio. It is. A more preferable heating temperature is 1000 to 1150 ° C.
  • the finish rolling finish temperature is preferably 750 ° C. or higher. If the temperature is lower than 750 ° C., the deformation resistance of the steel increases, the rolling load increases, it becomes difficult to roll, and a waiting time occurs until the rolled material reaches a predetermined rolling temperature, so the rolling efficiency decreases. It is because.
  • the steel material after hot rolling may be cooled by either air cooling or accelerated cooling, but accelerated cooling is preferred when higher strength is desired.
  • the cooling rate is 2 to 80 ° C./sec and the cooling stop temperature is 650 to 300 ° C.
  • the cooling rate is less than 2 ° C./sec and the cooling stop temperature exceeds 650 ° C.
  • the effect of accelerated cooling is small and sufficient strength cannot be achieved.
  • the cooling rate exceeds 80 ° C./sec and the cooling stop temperature is less than 300 ° C., the toughness of the obtained steel material may be reduced, or the shape of the steel material may be distorted.
  • the present invention is characterized in that the value of (Cu in weld metal) / (Cu in base material) is limited to the range defined by the above equation (3) as means for improving the corrosion resistance of the weld metal.
  • Cu in the weld metal and Cu in the base material (steel material) must satisfy the above formula (3).
  • (Cu in weld metal) / (Cu in base metal) is more preferably in the range of 3-6. A range of 3 to 5 is more preferable.
  • Cu, Mo and W in the weld metal are represented by the following formula (4): 1 ⁇ (Cu in weld metal) / ⁇ (Mo + W) in weld metal ⁇ ⁇ 10 (4) It is necessary to satisfy and contain. The inventors have found that when Cu and Mo or W are added in combination, the corrosion resistance of the welded joint is greatly improved by the synergistic effect of these elements.
  • Cu, Mo, and W in the weld metal must satisfy the above formula (4).
  • the content of Mo and W in a weld metal is in the range with which the said content satisfy
  • (Cu in weld metal) / ⁇ (Mo + W) in weld metal ⁇ is more preferably in the range of 1 to 5. A range of 1 to 4 is more preferable.
  • the inventors of the present invention further have Mo and W in the weld metal and the base material (steel material) represented by the following formula (5): 1 ⁇ ⁇ (Mo + W) in the weld metal ⁇ / ⁇ (Mo + W) in the base metal ⁇ ⁇ 10 (5)
  • Mo and W represented by the following formula (5): 1 ⁇ ⁇ (Mo + W) in the weld metal ⁇ / ⁇ (Mo + W) in the base metal ⁇ ⁇ 10 (5)
  • the present invention improves the corrosion resistance of the weld metal to the same level as the base material (steel material) without lowering the low temperature toughness of the welded joint, so that the weld metal does not contain Sn or Sb (welding
  • the point is to control the value of (Cu in metal) / (Cu in base material) to an appropriate range defined by equation (3).
  • the value of ⁇ (Mo + W) ⁇ / ⁇ (Mo + W) ⁇ in the base metal is 1 or more.
  • the welding material used for welding is used depending on the component composition of the steel (base material) and the welding conditions. )) Is preferably selected as appropriate.
  • a welding wire having a composition obtained by dividing the target composition of Cu, Mo, and W in the weld metal by the dilution ratio of the base material is produced and welded using this.
  • the welding method used for welding the crude oil tank of the present invention is a high heat input welding (high welding such as FAB welding, FCB welding, RF welding, which is a one-sided submerged arc welding method (one-side submerged arc welding)).
  • high welding such as FAB welding, FCB welding, RF welding
  • -heat input welding or carbonate gas arc welding (CO 2 welding (CO 2 arc welding)
  • CO 2 welding CO 2 arc welding
  • small heat input welding such as) (small-heat input welding) or the like
  • the chemical composition of the weld metal From the viewpoint of controlling to an appropriate range, it is necessary that the welding method uses a welding wire.
  • FAB welding is a registered trademark related to the welding method at Kobe Steel, Ltd., and a back bead is formed by one-pass welding by directly applying a backing material composed of glass tape, solid flux, etc. to the back surface of the steel plate.
  • FCB welding is a registered trademark related to the welding method of Kobe Steel, Ltd., and spraying a backing flux on a copper plate and pressing it against the back of the steel plate to form a back bead by one-pass welding.
  • the RF method is a registered trademark related to the welding method of Kobe Steel, Ltd., and a jig frame with an underlay flux piled under a backing flux containing a welding thermosetting resin is applied to the back of the steel plate. A method of forming a back bead by one-pass welding by pressing the flux.
  • the steel plates 1 to 36 were welded together by the welding methods described in Table 2-1 and Table 2-2 to prepare welded joints.
  • the heat input of each welding method was 146 kJ / cm for FCB welding, 180 kJ / cm for FAB welding, and 1.5 kJ / cm for CO 2 welding. All the grooves were V grooves.
  • the composition control of Cu, Mo, and W in the weld metal of each welded joint is performed by setting the target composition of Cu, Mo, and W to the base material dilution ratio (about 11% for CO 2 welding, about 47% for FAB welding, FCB welding). A welding wire having a composition obtained by rebating by about 67% was produced, and welding was performed using this.
  • FCB welding For FCB welding, a flux (PF-I55E / manufactured by Kobe Steel) and a back flux (PF-I50R / manufactured by Kobe Steel), and for FAB welding, a flux (PF-I52E / ( Kobe Steel, Ltd.), filler (RR-2 / Kobe Steel) and backing material (FA-B1 / Kobe) were used.
  • FCB welding refers to a method in which a backing flux is spread on a copper plate and pressed against the back surface of the steel plate to form a back bead by one-pass welding.
  • FAB welding refers to a method in which a backing material composed of glass tape, solid flux or the like is directly applied to the back surface of a steel plate to form a back bead by one pass welding.
  • This corrosion test apparatus is composed of a corrosion test bath 2 and a temperature control plate 3, and water 6 having a temperature of 36 ° C. is injected into the corrosion test bath 2, and In the water 6, a mixed gas (introduction gas 4) consisting of 12 vol% CO 2 , 5 vol% O 2 , 0.01 vol% SO 2 , 0.3 vol% H 2 S and the balance N 2 is introduced to corrode.
  • a mixed gas introduction gas 4 consisting of 12 vol% CO 2 , 5 vol% O 2 , 0.01 vol% SO 2 , 0.3 vol% H 2 S and the balance N 2 is introduced to corrode.
  • the inside of the test tank 2 is filled with supersaturated water vapor to reproduce the corrosive environment behind the upper deck of the crude oil tank. Then, the corrosion test piece 1 set on the upper and rear surfaces of the test tank is set to 25 ° C. ⁇ 3 hours via a temperature control plate 3 including a heater (electric heater) and a cooling system (cooling system). A temperature change with + 50 ° C. ⁇ 21 hours as one cycle was repeatedly applied for 180 days to cause dew condensation on the surface of the test piece 1 to cause overall corrosion.
  • 5 indicates the exhaust gas from the test tank.
  • a corrosion test was performed in which the test piece was immersed in 2 L of the test solution for 168 hours.
  • the test solution was preheated and maintained at 30 ° C. and replaced with a new test solution every 24 hours.
  • the apparatus used for the corrosion test is shown in FIG.
  • This corrosion test apparatus is a double-type apparatus of a corrosion test tank 8 and a constant-temperature bath 9, and the test solution 10 is put in the corrosion test tank 8, and the test piece 7 is inserted into the test piece (Tegs ( thread) 11 is suspended and immersed.
  • the temperature of the test solution 10 is maintained by adjusting the temperature of the water 12 placed in the thermostatic chamber 9.
  • the mass difference before and after the test is calculated, the difference is divided by the total surface area, and the reduction in thickness (corrosion rate on both sides) per year is calculated. It was. As a result, when the corrosion rate is 0.8 mm / year or less and local corrosion is not visually recognized in the base metal part and the welded part, the local corrosion resistance is good ( ⁇ ), and the corrosion rate exceeds 0.8 mm / year.
  • the corrosion rate is 1.0 mm / year or less and no local corrosion is visually recognized in the base metal part and the welded part, the local corrosion resistance is generally good ( ⁇ ), the corrosion rate is over 1.0 mm / year, or the mother The case where local corrosion was visually recognized in either the material part or the welded part was evaluated as poor ( ⁇ ) in the local corrosion resistance.
  • Figure 1-3 shows the effect of weld metal composition (bottom plate and top plate) on the corrosion resistance of corrosion-resistant steel welded joints for tankers for thick steel plates 1 to 36, with the horizontal axis (Cu in weld metal) / (in the base metal) And the vertical axis is plotted as (Cu in weld metal) / ⁇ (Mo + W) in weld metal ⁇ . From FIG. 3, (Cu in weld metal) / (Cu in base metal) is in the range of 3-7, and (Cu in weld metal) / ⁇ (Mo + W) in weld metal ⁇ is 1-10.
  • both the corrosion resistance test simulating the upper deck back and the corrosion resistance test simulating the tanker bottom plate environment have good corrosion resistance ( ⁇ and ⁇ in Table 2-1 and Table 2-2). It is shown ( ⁇ mark in FIG. 3).
  • “ ⁇ ” indicates “X” in any of the corrosion resistance test simulating the back of the upper deck and the corrosion resistance test simulating the tanker bottom plate environment.

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  • Mechanical Engineering (AREA)
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  • Organic Chemistry (AREA)
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  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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  • Butt Welding And Welding Of Specific Article (AREA)
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Abstract

La présente invention se rapporte à un joint soudé qui peut réduire de façon significative toute la corrosion ou une corrosion locale qui se produit dans une cuve de pétrole brut ; et à une cuve de pétrole brut qui comprend le joint soudé. De façon précise, la présente invention se rapporte à une cuve de pétrole brut qui comprend un joint soudé qui est formé en soudant des matériaux en acier qui contiennent chacun, en % en masse : une quantité de carbone (C) comprise entre 0,03 et 0,16 %, une quantité de silicium (Si) comprise entre 0,05 et 1,5 %, une quantité de manganèse (Mn) comprise entre 0,1 et 2,0 %, une quantité de phosphore (P) égale ou inférieure à 0,025 %, une quantité de soufre (S) égale ou inférieure à 0,010 %, une quantité d'aluminium (Al) comprise entre 0,005 et 0,10 %, une quantité d'azote (N) égale ou inférieure à 0,008 %, une quantité de chrome (Cr) supérieure à 0,1 % mais inférieure ou égale à 0,5 % et une quantité de cuivre (Cu) comprise entre 0,03 % et 0,4 %, et qui contiennent en outre un ou plusieurs éléments sélectionnés parmi le tungstène (W) en une quantité comprise entre 0,01 et 1,0 %, le molybdène (Mo) en une quantité comprise entre 0,01 et 0,5 %, l'étain (Sn) en une quantité comprise entre 0,001 et 0,2 % et l'antimoine (Sb) en une quantité comprise entre 0,001 et 0,4 %. Le joint soudé est également caractérisé en ce que le cuivre (Cu), le molybdène (Mo) et le tungstène (W) dans le métal soudé satisfont les relations suivantes : 3 < (Cu dans le métal soudé)/ (Cu dans la matrice) ≤ 7 et 1 ≤ (Cu dans le métal soudé)/{(Mo + W) dans le métal soudé} ≤ 10.
PCT/JP2011/061699 2010-05-18 2011-05-16 Joint soudé qui présente une excellente résistance à la corrosion et cuve de pétrole brut WO2011145740A1 (fr)

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JP5869918B2 (ja) * 2012-03-07 2016-02-24 株式会社神戸製鋼所 耐水素吸収性に優れた硫化水素環境用鋼材および鋼構造物
CN103290337A (zh) * 2013-06-14 2013-09-11 首钢总公司 一种原油油船货油舱上甲板用耐腐蚀钢
CN106676415B (zh) * 2015-11-06 2019-03-15 攀钢集团攀枝花钢铁研究院有限公司 含铬氮耐大气腐蚀型钢钢水和耐大气腐蚀型钢及其生产方法
WO2019102817A1 (fr) * 2017-11-24 2019-05-31 Ｊｆｅスチール株式会社 Matériau en acier résistant à la corrosion pour tôle de pont et tôle de fond de pétrolier transportant du brut et pétrolier transportant du brut
JP6813128B1 (ja) * 2019-11-13 2021-01-13 日本製鉄株式会社 鋼材
JP2022121317A (ja) 2021-02-08 2022-08-19 株式会社神戸製鋼所 ガスシールドアーク溶接用フラックス入りワイヤ
JP2022121316A (ja) 2021-02-08 2022-08-19 株式会社神戸製鋼所 ガスシールドアーク溶接用フラックス入りワイヤ
CN113549819B (zh) * 2021-06-29 2022-05-17 鞍钢股份有限公司 一种耐海洋飞溅区腐蚀用高性能钢板及其生产方法

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JP4968394B2 (ja) 2012-07-04
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