WO2005100625A1 - カーゴオイルタンク用鋼材 - Google Patents
カーゴオイルタンク用鋼材 Download PDFInfo
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- WO2005100625A1 WO2005100625A1 PCT/JP2005/007018 JP2005007018W WO2005100625A1 WO 2005100625 A1 WO2005100625 A1 WO 2005100625A1 JP 2005007018 W JP2005007018 W JP 2005007018W WO 2005100625 A1 WO2005100625 A1 WO 2005100625A1
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
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- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Definitions
- the present invention relates to a corrosion-resistant steel for a crude oil tank, and particularly to a steel material for a cargo oil tank that is a crude oil tank installed in a tanker.
- Recent crude oil tankers are required to have a double hull (double hull) structure.
- Figure 1 shows a partial cross-sectional schematic view of a double hull tanker, that is, a double hull tanker.
- a double hull tanker when crude oil is loaded, the inside of the cargo oil tank 10 is exposed to the corrosive environment due to crude oil, and when crude oil is not loaded, seawater is loaded into the ballast tank 12 outside the cargo oil tank 10 so that seawater Exposed to corrosive environment
- the inner wall 14 of the cargo oil tank is a corrosive environment for crude oil
- the outer wall 16 is a corrosive environment for seawater.
- the ceiling of the building is extremely harsh as a corrosive environment.
- Examples of steel for cargo oil tanks include steel containing Cu and Mg as essential components in JP-A-2000-17381, and steel containing Cr and A1 as essential components in JP-A-2001-107180. , Has been proposed respectively. However, in the steels disclosed in these publications, when crude oil contains H S, the effect of H S on corrosion
- Japanese Patent Application Laid-Open No. 2003-82435 discloses a technique of a steel material which is excellent in surface performance of both general corrosion and local corrosion, focusing on the form of corrosion in a cargo oil tank.
- this method does improve corrosion resistance, it does not consider the toughness of the weld joint. Since a welded joint always exists on an actual ship, it is a problem if the toughness of this part is reduced.
- the outer wall 16 of the cargo oil tank 10 is exposed to corrosion in a seawater environment, unlike the above-described corrosion environment of crude oil.
- seawater splash environment In this seawater corrosive environment, the corrosive environment is different between the top plate, the side plate and the bottom plate.
- the top plate is splashed with loaded seawater and is subject to repeated wet and dry due to temperature differences between day and night Environment (hereinafter referred to as the seawater splash environment). It is known that such a seawater splash environment is generally a very severe corrosive environment.
- the side plate and the bottom plate are always immersed in seawater (hereinafter referred to as seawater immersion environment), and the corrosive environment is relatively severe.
- the outer wall surface of the cargo oil tank is provided with corrosion protection by painting.
- the coating deteriorates over time, and corrosion tends to progress particularly at the thinner edge and corner portions.
- the steel itself shows corrosion resistance, the frequency of maintenance such as repainting is high because the corrosion resistance of the steel is not sufficient, and the cost for maintenance becomes extremely large.
- the material of the cargo oil tank used for the tanker having the double hull structure is required to have high corrosion resistance in a crude oil corrosion environment and a seawater corrosion environment, respectively.
- An object of the present invention is to provide a steel material for a cargo oil tank having excellent resistance to general corrosion and localized corrosion simultaneously in both a crude oil corrosion environment and a seawater corrosion environment, and having excellent toughness in both a base material and a welded portion. It is to be.
- the present inventors conducted experiments to simulate the actual corrosive environment of a tanker in order to develop such a steel material.
- the gist of the present invention is a steel material for a cargo oil tank shown in the following (1) to (4).
- Ceq * C + Mn / 6 + Ni / 15 + Cu / 15 + W / 10 + Cr / 5 + Mo / 5 (1)
- a crude oil tanker provided with an oil tank constituted by using the steel material described in any of (1) to (5) above.
- the corrosion resistance of the cargo oil tank in a corrosive environment is improved, and the maintenance cost can be significantly reduced.
- FIG. 1 is a schematic cross-sectional view of a double hull tanker.
- FIG. 2 (a) is a schematic explanatory view of an experimental apparatus showing a reproduction test of a gas phase part
- FIG. 2 (b) is a reproduction test of a bottom plate part.
- C is an element necessary to secure the strength as a material, and has a content of 0.01% or more. However, if the content exceeds 0.2%, the weldability decreases. In addition, as the C content increases, the amount of cementite that becomes a power source and accelerates corrosion in an environment of repeated wet and dry with acidic water increases, and the weldability deteriorates. Therefore, the upper limit was set to 0.2%.
- Si is an element necessary for deoxidation, and is contained in an amount of 0.01% or more in order to obtain a sufficient deoxidizing effect. However, if the content exceeds 1%, the toughness of the base metal and the welded joint is impaired. For this reason, the content of Si is set to 0.01 to 1%. The preferable range of the content is 0.01 to 0.8%, and the more preferable range is 0.01 to 0.5%.
- Mn is an element having an effect of increasing the strength of steel at low cost, and in order to obtain this effect, the content is made 0.05% or more. However, when the content exceeds 2%, weldability and joint toughness are deteriorated. Therefore, the content of Mn is set to 0.05 to 2%. A preferable range of the content is 0.05 to 1.8%, and a more preferable range is 0.05 to 1.5%.
- P is an impurity element contained in the steel and reduces the weldability. In particular, when the content exceeds 0.05%, the weldability is significantly reduced. Therefore, the content of P is set to 0.05% or less. Since P has the effect of reducing the weldability and improving the overall corrosion resistance and pitting corrosion resistance in the crude oil tank, as well as the corrosion resistance in the seawater splash environment and seawater immersion environment, it is necessary to improve the corrosion resistance. May be contained at 0.01% or more. A preferred upper limit of the P content is 0.04%, and a more preferred upper limit is 0.03%.
- S is an impurity element contained in steel. If its content exceeds 0.01%, MnS is generated in a large amount in the steel, and MnS becomes a starting point of corrosion, resulting in general corrosion and pores. Eating occurs. Therefore, the content of S is set to 0.01% or less. A preferred upper limit of the S content is 0.008%, and a more preferred upper limit is 0.005%. The lower the S content, the better.
- Ni is an element that improves the overall corrosion resistance in a dry / wet cyclic environment that does not contain H 2 S.
- Ni also has an effect of forming an anticorrosive sulphide film in a wet sulphide hydrogen environment to enhance the overall corrosion resistance and an effect of improving pitting corrosion resistance. In addition, it has the effect of improving the corrosion resistance in a seawater splash environment or seawater immersion environment.
- These effects reduce Ni to 0.01% It is obtained by containing the above. In particular, if the content is 0.05% or more, more remarkable effects can be obtained. However, even if Ni is contained in an amount exceeding 1%, the above effect is saturated, and the cost is increased. Therefore, the content of Ni is set to 0.01 to 1%.
- the preferable range of the content is 0.05 to 1%, and the more preferable range is 0.1 to 1%.
- Cu is an element that does not contain H 2 S and improves the general corrosion resistance in a dry and wet environment.
- W is an element that improves overall corrosion resistance in a dry and wet environment without H 2 S
- w also has the effect of forming an anticorrosive sulphide film in a wet sulphide hydrogen environment to increase the overall corrosion resistance and the effect of improving the pitting corrosion resistance. Further, w also has an action of increasing acid resistance. It also has the effect of improving the corrosion resistance in a seawater splash environment'seawater immersion environment.
- W improves corrosion resistance more than the effect of sole addition in the presence of Cu and Ni, and is an important element together with Cu and Ni in the present invention.
- the content of W is 0.01% or more.
- the content of W exceeds 1%, the above-mentioned effect is saturated and the cost increases, leading to poor weldability. Therefore, the content is preferably set to 1% or less.
- Cr is dry and wet containing H S, an element that improves corrosion resistance in a seawater immersion environment.
- the overall corrosion resistance is significantly reduced.
- its content exceeds 0.1%, it is resistant to general corrosion in the above environment.
- the property is significantly reduced. Therefore, the upper limit is set to 0.1% or less, but is preferably 0.05% or less. In other words, impurities are limited to 0.1% or less.
- A1 is a force that is an element effective for deoxidizing steel
- deoxidation can be performed with Si. Therefore, since it is not particularly necessary to perform deoxidation treatment with A1, A1 may not be added.
- the upper limit of the content is preferably set to 0.1% or less. In other words, the impurity is limited to 0.1% or less.
- N has the effect of improving the pitting corrosion resistance by dissolving as ammonia and suppressing the pH decrease in the pitting portion of the bottom plate.
- the N content is set to 0.001 to 0.01%.
- it is 0.001 to 0.006%, more preferably 0.001 to 0.005%.
- O oxygen
- Oxgen has an effect of forming an oxidized product serving as a ferrite generation nucleus, refining the structure, and improving the toughness of the welded joint. However, if it is contained excessively, it forms oxide nonmetallic inclusions (CaO, MgO, AlO, etc.) that easily become the starting point of pitting corrosion and deteriorates corrosion resistance.
- the O content is set to 0.0001 to 0.005%.
- the following formula a is defined as 0.75 or less, and / 3 is defined as 0.8 or less.
- ⁇ is an index that indicates the overall corrosion resistance and pitting resistance in a crude oil corrosion environment, respectively, and is an empirical formula obtained by experiments.
- ⁇ (1-0. 691 XCu) X (1— 0.21 XNi) X (1— 0.142 XW)
- the steel material for cargo oil tanks that is useful in the present invention is usually assembled into a tank by welding, it is desirable to satisfy a predetermined weldability. Therefore, also in the present invention, it is preferable that the carbon equivalent Ceq * of the steel composition represented by the following formula (1) be 0.38 or less.
- Ceq * C + Mn / 6 + Ni / 15 + Cu / 15 + W / 10 + Cr / 5 + Mo / 5 (1)
- a is defined as 0.85 or less
- b is defined as 0.9 or less.
- a, b is an index showing the corrosion resistance in the seawater splash environment and seawater immersion environment, respectively, and is an empirical formula obtained by experiments.
- At least one of Mo, Ti, Zr, Sb, Sn, Ca, Mg, Nb, V, and B may be combined! .
- Mo is an element that does not contain H 2 S and improves the general corrosion resistance in a dry and wet environment.
- Mo also has the effect of forming a corrosion-resistant sulphide film in a wet sulphide hydrogen environment to increase the overall corrosion resistance and the effect of improving the pitting corrosion resistance. Further, Mo also has an effect of increasing acid resistance. Mo also has the effect of improving the corrosion resistance in both the seawater splash environment and the seawater immersion environment. These effects can be obtained even when the content is at the impurity level, but in order to obtain the effect more remarkably, the content of Mo is preferably set to 0.05% or more. More preferably, it is at least 0.66%. However, even if Mo is contained in excess of 1%, not only the effect is saturated, but also the weldability is impaired, and the cost is increased. Therefore, when Mo is added, its content is preferably 1% or less. The lower limit of the Mo content when added is more preferably 0.1%, more preferably 0.3%.
- Ti has an effect of suppressing the generation of MnS, which is a starting point of corrosion by forming TiS, and improving the overall corrosion resistance and the pitting resistance. In addition, it has the effect of suppressing initial corrosion in a seawater splash environment or seawater immersion environment. Ti also has the effect of increasing the strength of steel. Ti also has the effect of improving the toughness of steel. These effects can be obtained even when the content is at the impurity level. However, in order to obtain the effects more remarkably, the content of Ti is preferably set to 0.005% or more. However, even if Ti is contained in an amount exceeding 0.1%, the above-described effects are stiff if the cost increases. Therefore, when Ti is added, its content is preferably set to 0.1% or less. The lower limit of the content of Ti when added is more preferably 0.01%, and more preferably 0.05%.
- Zr has an effect of forming sulfide preferentially, suppressing the generation of MnS, and improving the overall corrosion resistance. Further, Zr is an element that is less likely to form a nitride than Ti, and has the following characteristics when a sulfide is formed more efficiently. This effect can be obtained even at the impurity level content. In order to obtain the effect more remarkably than the obtained force, the content is preferably 0.005% or more. However, when Zr exceeds 0.2%, the toughness is reduced. Therefore, when Zr is added, its content is preferably set to 0.2% or less.
- Sb has an effect of improving the general corrosion resistance and the acid resistance in a repeated dry and wet environment. It also has the effect of improving the pitting resistance by improving the corrosion resistance in an environment where the pH of the pit portion is low. It also has the effect of improving corrosion resistance when the pH drops in a seawater splash environment. These effects can be obtained even when the content is at the impurity level. However, in order to obtain the effects more remarkably, the content of Sb is preferably set to 0.01% or more. However, even if Sb is contained in an amount exceeding 0.2%, the above effect is saturated. Therefore, when adding Sb, its content is preferably set to 0.2% or less. The lower limit of the content of Sb when added is preferably 0.05%.
- Sn Similar to Sb, Sn has an effect of improving the overall corrosion resistance in a dry and wet repeated environment and the acid resistance. It also has the effect of improving pitting corrosion resistance by improving its corrosion resistance in environments where the pH of the pits is low. It also has the effect of improving corrosion resistance when the pH drops in a seawater splash environment.
- the content of Sn is preferably set to 0.01% or more. However, even if Sn is contained in excess of 0.2%, the above effect is saturated. Therefore, when Sn is added, its content is preferably set to 0.2% or less. The lower limit of the Sn content when added is preferably 0.05%.
- At least one of Ca and Mg is blended in order to enhance corrosion resistance.
- Ca has the effect of improving corrosion resistance by dissolving in water at the time of a corrosion reaction and becoming alkali, thereby suppressing a decrease in pH at the steel material interface.
- the gas phase in the crude oil tank and the pits on the bottom plate are in a low pH environment, which is effective in improving corrosion resistance in such environments.
- the pH is lowered during the corrosion reaction due to the presence of high concentration of chloride, and the corrosion is promoted. Therefore, it is also effective in such environment.
- the effect that these effects can be obtained by containing 0.013% or more, because the effect is saturated when it exceeds 0.01%.
- Ca content is 0.0003 to 0.01%. Preferred! /, The range is 0.0003-0.006%, more preferably 0.0003-0.005%.
- Mg Like Ca, Mg also has the effect of improving the corrosion resistance by suppressing the decrease in pH at the steel material interface during the corrosion reaction. These effects can be obtained by containing 0.0003% or more. However, when the content exceeds 0.01%, the effect is saturated. Therefore, the content of Mg is set to 0.0003-0. 01%. The preferred range is from 0.0003 to 0.006%, more preferably from 0.0003 to 0.005%.
- At least one of Nb, V and B may be blended in order to further increase the strength of the steel.
- Nb is an element having an effect of increasing the strength of steel. This effect is obtained when the content is 0.005% or more. However, if the content exceeds 0.1%, the toughness is deteriorated. Therefore, the content is set to 0.005 to 0.1%. The preferred range is from 0.005 to 0.05%, more preferably from 0.005 to 0.05%.
- V is an element having an effect of increasing the strength of steel. This effect is obtained when the content is 0.005% or more, but if it exceeds 0.1%, the toughness and weldability deteriorate, so the content is made 0.005 to 0.1%.
- the preferred range is from 0.005 to 0.06%, preferably ⁇ or 0.005 to 0 in further. 05 0/0.
- ⁇ is an element having an effect of increasing the strength of steel. This effect is obtained when the content is more than 0.013%, and the toughness deteriorates when the force exceeds 0.01%. Therefore, the content is set to 0.0003 to 0.01%.
- a preferred range is from 0.0003 to 0.006%, more preferably from 0.0003 to 0.005%.
- a slab that has been subjected to treatments such as RH, DH, and electromagnetic stirring at the steel making stage while keeping the content of S low is heated to a heating temperature of 1100 ° C. ⁇ 1200 ° C, hot rolling at a rolling reduction of 3% or more per pass, and a rolling finish temperature of about 700 to 900 ° C.
- the steel of the present invention is typically a plate, but also includes a rod, a tube, and a shape. Even if used as is, it shows good corrosion resistance and can reduce the corrosion allowance.However, if the surface is covered with an anticorrosion coating made of organic resin, metal, or metal, the durability of the anticorrosion coating will increase. The corrosion resistance is further improved.
- examples of the anticorrosion coating made of an organic resin include resin coatings of vinyl butyral type, epoxy type, urethane type, phthalic acid type, etc .; And a thermal spray coating.
- the durability of the anticorrosion coating is improved because the corrosion of the steel material of the present invention, which is the base, is significantly suppressed. It is considered that peeling is suppressed.
- the anticorrosion treatment for covering the steel material surface with the above anticorrosion coating may be performed by an ordinary method. Also, it is not always necessary to apply an anticorrosion coating to the entire surface of the steel material.Such only one surface of the steel material that is exposed to a corrosive environment, such as a steel plate, is subjected to such anticorrosion treatment. Is also good.
- a manufacturing method that finishes to a thickness of 20 mm at 750 ° C and then cools it to room temperature in the air.
- Manufacturing method 2 A block with a thickness of 120 mm is heated at 1150 ° C for 2 hours and then hot-rolled to 850
- a manufacturing method that finishes to a thickness of 20mm at ° C, then water-cools the temperature range from 800 ° C to 500 ° C, and then cools to room temperature in the air.
- a glass container 30 containing a 0.1% by mass aqueous NaCl solution 31 in a lower third portion was prepared, and a collected test piece 32 was attached to the lower surface.
- the upper end of the opening of the glass container is sealed with the acrylic lid 34 (top plate test in Fig. 2 (a)).
- the lid 34 has a gas inlet 36a having a gas inlet 36a and an outlet 36b.
- the sealed glass container 30 is set in a thermostat 38, and the temperature is changed from 50 ° CX for 20 hours to 25 ° CX for 4 hours. A temperature cycle was applied for 4 months.
- the gas phase part 40 in the glass container was simulated at the time of ballast and full load, and the following two types of gas A and gas B were alternately blown at two-week intervals from the gas supply port. .
- Example 1 the same test piece as in Example 1 was used, and a test was performed assuming the bottom plate of a cargo oil tank of an actual tanker.
- a glass container 30 containing artificial seawater at 40 ° C. is prepared, and a corrosion test piece 44 is immersed in artificial seawater (bottom plate test in FIG. 2 (b)).
- the hermetically sealed glass container 30 was placed in a thermostat 38, and an immersion test was performed for 28 days.
- the above gas B was blown from the gas inlet 36a of the gas supply port 36. Corrosion test 2.
- the same members as those in FIG. 2A are denoted by the same reference numerals.
- the corrosion test piece 44 was prepared by applying a sludge 48 to a test piece collected from a steel plate except for a circular portion 46 having a diameter of 5 mm.
- the pit depth was measured by measuring the depth of the pit occurrence portion in the above-mentioned circular portion 46 in the corrosion test piece after the test, with reference to the portion where pitting occurred, i.e. This was performed using a meter.
- the value V the largest value of the depth at the pitting occurrence part, was adopted as the pitting depth.
- the pitting corrosion rate in units of "mmZ years" was determined from the pitting corrosion depth of each test piece. Table 2 shows the results of the above tests as corrosion test 2 together with the manufacturing conditions for a 20 mm thick steel sheet.
- Table 1 shows ⁇ and j8, which are indexes of corrosion resistance, and Ceq *, which is an index of weldability, together with the iridical components.
- Comparative Examples A, S, U to X, and AA since the alloying elements were not properly added, a was 0. Is greater than 75 or ⁇ is greater than 0.8, and corrosion test 1 or 2 has insufficient corrosion resistance. Further, Comparative Example ⁇ ⁇ does not contain Ni and W, and the corrosion test 1 or 2 has insufficient corrosion resistance. In Comparative Examples S, W and Z, Cr, Mo, and Ni were excessive, respectively, and cracks and the like occurred during welding with high Ceq *, so that Charpy impact test specimens could not be collected.
- Comparative Examples X and AA the toughness of the joint was reduced, and the weldability and welded joint properties when the application to an actual tank were taken into account were insufficient.
- Comparative Example AB a was 0.75 or less, / 3 was 0.8 or less, and Ceq * was 0.38 or less.
- Examples 1 to 3 above are tests relating to a corrosion test in a crude oil environment. Next, a description will be given of a corrosion test in a seawater environment.
- Example 4 This is a corrosion test simulating a seawater splash environment.
- test pieces with a width of 60 mm, a length of 100 mm, and a thickness of 3 mm were collected from each of the 20 mm thick steel plates obtained by the above-mentioned manufacturing method 1 or 2, and Atmospheric exposure test was conducted for one year at Furushima Island, prefecture (offshore distance of 5m), inclined 30 ° from the horizontal toward the south.
- This environment is an environment in which seawater splash is directly applied to the test piece, and is a test in a corrosive environment corresponding to the seawater splash environment of the ballast tank top plate.
- the corrosion product was removed from the test specimen after the test, and the difference in weight before and after the test was divided by the surface area to determine the average amount of reduction in thickness, which was converted to the corrosion rate in units of “mm / year”.
- Table 2 shows the results of the above tests as corrosion tests 3 together with the manufacturing conditions for a 20-mm-thick steel sheet.
- a corrosion test was performed in a seawater immersion environment. That is, using the same test piece as in Example 4, it was immersed for half a year in natural seawater pumped by sea power in Hainan, Wakayama Prefecture.
- This environment is a corrosive environment equivalent to the seawater immersion environment on the back of the side plate and bottom plate of the crude oil tank, and on the ballast tank side.
- Table 2 shows the results of each of the above tests as corrosion tests 4 together with the manufacturing conditions for a 20 mm thick steel sheet.
- a and b which are indicators of corrosion resistance, are shown together with the chemical components in Table 1.
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Abstract
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Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004-119128 | 2004-04-14 | ||
JP2004119128 | 2004-04-14 | ||
JP2004-305666 | 2004-10-20 | ||
JP2004305666A JP4449691B2 (ja) | 2004-04-14 | 2004-10-20 | カーゴオイルタンク用鋼材 |
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JP (1) | JP4449691B2 (ja) |
KR (2) | KR20060122952A (ja) |
WO (1) | WO2005100625A1 (ja) |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100447279C (zh) * | 2006-02-27 | 2008-12-31 | 宝山钢铁股份有限公司 | 一种耐海水腐蚀钢及其生产方法 |
EP2009125A4 (en) * | 2006-03-30 | 2017-08-16 | JFE Steel Corporation | Corroson-resistant steel material for crude oil storage tank, and crude oil storage tank |
CN102301025B (zh) * | 2009-01-30 | 2014-06-25 | 杰富意钢铁株式会社 | 原油罐用耐腐蚀钢材及其制造方法以及原油罐 |
CN104614305A (zh) * | 2015-01-30 | 2015-05-13 | 钢铁研究总院青岛海洋腐蚀研究所 | 检测货油舱上甲板钢耐腐蚀性的模拟试验装置和使用方法 |
Also Published As
Publication number | Publication date |
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KR20080049133A (ko) | 2008-06-03 |
KR20060122952A (ko) | 2006-11-30 |
JP2005325439A (ja) | 2005-11-24 |
JP4449691B2 (ja) | 2010-04-14 |
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