WO2019102817A1 - 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 - Google Patents

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 Download PDF

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WO2019102817A1
WO2019102817A1 PCT/JP2018/040742 JP2018040742W WO2019102817A1 WO 2019102817 A1 WO2019102817 A1 WO 2019102817A1 JP 2018040742 W JP2018040742 W JP 2018040742W WO 2019102817 A1 WO2019102817 A1 WO 2019102817A1
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corrosion
steel material
crude oil
bottom plate
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PCT/JP2018/040742
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English (en)
Japanese (ja)
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至 寒澤
塩谷　和彦
俊一 橘
博司 池田
聡 伊木
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Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to JP2019518130A priority Critical patent/JP6536769B1/ja
Priority to KR1020207016711A priority patent/KR102430613B1/ko
Priority to CN201880075730.4A priority patent/CN111386357B/zh
Publication of WO2019102817A1 publication Critical patent/WO2019102817A1/fr
Priority to PH12020550666A priority patent/PH12020550666A1/en

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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
    • 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
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • 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
    • 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

Definitions

  • the present invention is suitable for crude tanker top decks and bottom plates suitable for use in crude oil tanks of crude oil tankers, particularly in the ceiling and side walls of crude oil tanks where general corrosion occurs, and at the bottom of crude oil tanks where pitting occurs. It relates to a corrosion resistant steel material.
  • the present invention also relates to a crude oil tanker composed of the above-described steel material.
  • the corrosion resistant steel material for crude tanker upper deck and bottom plate of the present invention includes thick steel plate, thin steel plate and shaped steel.
  • the cause of such local corrosion is (1) The presence of aggregated water in which salts such as sodium chloride are dissolved at high concentration, (2) Desorption of oil coat due to excessive washing, (3) Increasing the concentration of sulfides contained in crude oil, (4) Increasing the concentration of O 2 , CO 2 , SO 2, etc. in inert gas for explosion-proof, dissolved in condensation water, Etc.
  • high concentrations of chloride ion and sulfate ion are detected.
  • the most effective method for preventing the above-mentioned overall corrosion and local corrosion is to apply heavy coating to the surface of the steel material and to shield the steel material from the corrosive environment.
  • the coating operation of the crude oil tank not only has a large application area but also requires repainting about once every ten years due to the deterioration of the coating film, resulting in a huge cost for inspection and coating.
  • Patent Document 1 “% By mass, C: 0.01 to 0.3%, Si: 0.02 to 1%, Mn: 0.05 to 2%, P: 0.05% or less, S: 0.01% or less, Ni: 0.05 to 3%, Mo: 1% or less, Cu: 1% or less, Cr: 2% or less, W: 1% or less, Ca: 0.01% or less, Ti: 0.1% or less, Nb Steels for cargo oil tanks containing 0.1% or less, V: 0.1% or less, B: 0.05% or less, the balance being Fe and impurities. " Is disclosed.
  • Patent Document 2 also includes “% By mass, C: 0.01 to 0.2%, Si: 0.01 to 1%, Mn: 0.05 to 2%, P: 0.05% or less, S: 0.01% or less, Ni: 0.01 to 1%, Cu: 0.05 to 2%, Sn: 0.01 to 0.2%, Cr: 0.1% or less, Al: 0.1% or less, balance Fe And steel materials for cargo oil tanks consisting of impurities. " Is disclosed.
  • the steel material for the upper deck of the crude oil tanker and the steel material for the bottom plate of the crude oil tanker be a steel material that can be used for both.
  • both Patent Document 1 and Patent Document 2 5% O 2 -13% CO 2 -0.02% SO 2 -Remaining N 2 in gas A: volume%, and gas B: volume%, and 5% O 2 -13% CO 2 -0.02% SO 2 -0.25% H 2 S- residual N 2, under the conditions blown alternately at 2-week intervals, the actual ship deck back (upper deck back surface A corrosion test simulating the environment has been conducted, and the corrosion resistance in the deck rear (upper deck rear) environment has been evaluated based on the test results.
  • the present invention was developed in view of the above-mentioned present situation, and has excellent overall corrosion resistance and local corrosion resistance, which can be used for either the upper deck of a crude oil tanker or the bottom plate of a crude oil tanker. It is an object of the present invention to provide a corrosion resistant steel material for a crude tanker upper deck and a bottom plate having the Another object of the present invention is to provide a crude oil tanker composed of the above-described steel material.
  • Patent Document 3 “% By mass, C: 0.03 to 0.18%, Si: 0.03 to 1.50%, Mn: 0.1 to 2.0%, P: 0.025% or less, S: 0. A steel material containing 010% or less, Al: 0.005 to 0.10%, N: 0.008% or less and Cu: 0.05 to 0.4%, the balance being Fe and unavoidable impurities
  • Patent Document 3 prevents overall corrosion resistance in the upper deck rear surface environment (hereinafter also referred to as upper deck rear surface environment) of the crude oil tanker, and resistance in the bottom panel environment of the crude oil tanker (hereinafter also referred to as bottom panel environment). It has become possible to make it compatible with local corrosion. However, at present, there is a demand for further prolonging the life of crude oil tanks of crude oil tankers, which requires further improvement of corrosion resistance.
  • pitting corrosion Local corrosion of the bottom plate
  • local corrosion resistance is large. improves.
  • microorganisms in the seawater accumulated at the bottom of the crude oil tank are largely involved in the corrosion at the initial stage of pitting (that is, the ease of occurrence of pitting). That is, microorganisms present in seawater adhere to the surface of the steel material to form a biofilm.
  • the biofilm acts as a permeation barrier of the corrosion factor to the steel surface to suppress the occurrence of pitting.
  • the addition of Nb and / or Sb to the steel is effective for forming a biofilm on the surface of the steel material, and the occurrence of pitting corrosion is greatly suppressed by containing these elements.
  • the surface layer portion of the steel material is a depth of 5 mm from the surface of the steel material in the thickness direction (direction perpendicular to the length direction (rolling direction) of the steel material and perpendicular to the width direction (rolling perpendicular direction)) Alternatively, it means the region to the depth of 1/4 of the thickness in the thickness direction, whichever is smaller.
  • the gist configuration of the present invention is as follows. 1. In mass%, C: 0.03 to 0.18%, Si: 0.01 to 1.50%, Mn: 0.10 to 2.00%, P: 0.030% or less, S: 0.0080% or less, Al: 0.001 to 0.100%, N: 0.0080% or less, Ni: 0.010 to 1.00% and Cu: 0.010 to 0.50% Sb: 0.010 to 0.50% and Nb: 0.005 to 0.300%.
  • a corrosion resistant steel material for a crude oil tanker upper deck and a bottom plate characterized in that a solid solution Cu content in a surface layer portion of the steel material is 0.40 mass% or less and a relationship of the following formula (1) is satisfied.
  • [% solid solution Cu] is the amount (mass%) of solid solution Cu in the surface layer portion of the steel material.
  • [% Cu] is Cu content (mass%) in the said component composition.
  • the above component composition is further in mass%, Sn: 0.01 to 0.50%, Mo: 0.01 to 1.00% and W: 0.01 to 1.00%
  • the above component composition is further in mass%, Cr: 0.01 to 1.00% and Co: 0.01 to 0.50%
  • the above component composition is further in mass%, Ti: 0.001 to 0.100%, Zr: 0.001 to 0.100% and V: 0.001 to 0.100% 7.
  • the above component composition is further in mass%, Ca: 0.0001 to 0.0100%, Mg: 0.0001 to 0.0200% and REM: 0.0002 to 0.2000% 7.
  • the above component composition is further in mass%, B: 0.0001 to 0.0300%
  • a crude oil tanker comprising the corrosion resistant steel material for a crude tanker upper deck and a bottom plate according to any one of 1 to 6 above.
  • test device used for the general corrosion test It is a figure explaining the test device used for the local corrosion test (early stage). It is a figure explaining the test device used for the local corrosion test (progress stage).
  • C 0.03 to 0.18% C is an element necessary for securing the strength of the steel. However, if the C content exceeds 0.18%, the weldability and the toughness of the weld heat affected zone are reduced. Therefore, the C content is in the range of 0.03 to 0.18%. Preferably, it is in the range of 0.04 to 0.16%.
  • Si 0.01 to 1.50% Si is an element added for deoxidation. However, if the Si content is less than 0.01%, the deoxidizing effect is poor. On the other hand, if the Si content exceeds 1.50%, the toughness and the weldability deteriorate. Therefore, the Si content is set to 0.01 to 1.50%.
  • the lower limit of the Si content is preferably 0.03%, more preferably 0.05%. Moreover, 0.70% is preferable and 0.50% of the upper limit of Si content is more preferable.
  • Mn 0.10 to 2.00%
  • Mn is an element that improves strength and toughness. However, if the Mn content is less than 0.10%, the effect is not sufficient. On the other hand, if the Mn content exceeds 2.00%, the weldability is degraded. Therefore, the Mn content is in the range of 0.10 to 2.00%. Preferably, it is in the range of 0.40 to 1.80%. More preferably, it is in the range of 0.60 to 1.60%.
  • P 0.030% or less P degrades toughness and weldability. For this reason, the P content is made 0.030% or less. Preferably it is 0.025% or less. More preferably, it is 0.015% or less.
  • S 0.0080% or less
  • S is a harmful element that degrades the toughness and weldability of steel, so it is desirable to reduce it as much as possible.
  • S content is made into 0.0080% or less.
  • it is 0.0070% or less, more preferably 0.0060% or less.
  • Al 0.001 to 0.100%
  • Al is an element added as a deoxidizer, and its content is made 0.001% or more. However, if the Al content exceeds 0.100%, the toughness of the steel decreases. Therefore, the upper limit of the Al content is 0.100%.
  • N 0.0080% or less Since N is a harmful element which lowers toughness, it is desirable to reduce as much as possible. In particular, when the N content exceeds 0.0080%, the decrease in toughness becomes large. For this reason, the N amount is made 0.0080% or less. Preferably it is 0.0070% or less.
  • Ni is an important element that improves the general corrosion resistance in the upper deck rear surface environment. That is, Ni is taken into the rust layer as the steel material corrodes in the upper deck rear surface environment, and has an action of refining rust particles. In addition, the minuteness of the rust particles improves the compactness (shielding property) of the rust layer and suppresses the progress of corrosion. In order to acquire such an effect, it is necessary to make Ni content 0.010% or more. However, when Ni is excessively contained, weldability and toughness are degraded, which is disadvantageous also from the viewpoint of cost. Therefore, the Ni content is in the range of 0.010 to 1.00%. Preferably, it is in the range of 0.02 to 0.80%. More preferably, it is in the range of 0.03 to 0.60%.
  • Cu 0.010 to 0.50%
  • Cu is an important element which improves both general corrosion resistance in the upper deck rear surface environment and local corrosion resistance in the bottom plate environment. That is, Cu ions combine with corrosive anions such as S 2- in a low pH environment to form a sparingly soluble Cu compound on the steel surface, thereby protecting the steel surface and suppressing overall corrosion and pitting corrosion. . In order to obtain such an effect, the Cu content is made 0.010% or more. On the other hand, if the Cu content exceeds 0.50%, the weldability and toughness are deteriorated, which is disadvantageous from the viewpoint of cost.
  • the Cu content is in the range of 0.010 to 0.50%.
  • it is 0.02% or more, more preferably 0.03% or more.
  • it is 0.40% or less, More preferably, it is 0.30% or less.
  • Sb 0.010 to 0.50% and Nb: one or two selected from 0.005 to 0.300%
  • Sb and Nb are in the early stage of corrosion before pitting develops. It is an important element that is effective in suppressing (suppressing the occurrence of pitting). That is, Sb and Nb will be present in the form of fine oxides such as Sb 2 O 3 and NbO 2 on the surface of the steel, respectively, as the base material is dissolved by corrosion.
  • the surface of the steel on which Sb 2 O 3 and NbO 2 are present provides a suitable habitat for microorganisms, and promotes biofilm formation on the surface of the steel. As a result, corrosion in the early stage of pitting, that is, the occurrence of pitting is suppressed.
  • the Sb content is in the range of 0.010 to 0.50%, and the Nb content is in the range of 0.005 to 0.300%.
  • the Sb content is in the range of 0.02 to 0.35%. More preferably, Sb: in the range of 0.02 to 0.30%, still more preferably Sb: in the range of 0.03 to 0.25%. Further, preferably, it is in the range of Nb: 0.010-0.200%.
  • Sn 0.01 to 0.50%
  • Mo 0.01 to 1.00%
  • W 0.01 to 1.00%
  • Sn Sn is associated with corrosion They are released as Sn 2+ ions from the surface of the steel material, and combine with the corrosion factor S 2 ⁇ to form SnS. This suppresses the permeation of S 2 ⁇ to the steel material interface.
  • Mo and W are released as MoO 4 2- ions and WO 4 2- ions, respectively, taken into rust, giving cation selective permeability to rust, and Cl ⁇ and SO 4 2- to the steel material interface.
  • S 2-, etc. electrically suppress the permeation of corrosive anions.
  • the content thereof is in the range of Sn: 0.01 to 0.50%, Mo: 0.01 to 1.00% and W: 0.01 to 1.00%.
  • Sn is in the range of 0.02 to 0.30%, and more preferably in the range of 0.03 to 0.25%.
  • it is in the range of 0.02 to 0.70% Mo, and more preferably in the range of 0.03 to 0.50% Mo.
  • W is in the range of 0.02 to 0.70%, more preferably W: 0.03 to 0.50%.
  • the content thereof is in the range of Cr: 0.01 to 1.00% and Co: 0.01 to 0.50%.
  • all are in the range of 0.02 to 0.30%. More preferably, all are in the range of 0.03 to 0.20%.
  • Ti, Zr and V are In order to ensure the desired strength, one or more of these can be contained. However, if any of the elements is contained in a large amount, the toughness and the weldability deteriorate. Therefore, when each of these elements is contained, the content thereof is in the range of 0.001 to 0.100%. Preferably, it is in the range of 0.005 to 0.050%.
  • Any of Ca, Mg and REM can be contained. However, if any of the elements is contained in a large amount, the toughness of the welded portion may be deteriorated and the cost may be increased. Therefore, when these elements are contained, the content thereof is in the range of Ca: 0.0001 to 0.0100%, Mg: 0.0001 to 0.0200% and REM: 0.0002 to 0.2000%. .
  • B 0.0001 to 0.0300%
  • B is an element which improves the hardenability of steel materials, and can be contained as needed in order to secure the strength of steel materials. In order to acquire such an effect, it is preferable to contain B 0.0001% or more. However, when the B content exceeds 0.0300%, the toughness is significantly deteriorated. Therefore, when B is contained, the content thereof is in the range of 0.0001 to 0.0300%.
  • the components other than the above are Fe and unavoidable impurities.
  • the form of Cu presence in the steel material is controlled, and Cu existing in a solid solution state in the surface layer of the steel (hereinafter also referred to as solid solution Cu in the surface layer of steel) It is extremely important to make the amount of) a certain percentage or more. That is, from the viewpoint of the corrosion of steel progressing from the surface of steel and the function maintenance of crude oil tanker upper deck and bottom plate, the corrosion weight loss of acceptable thickness is about several mm (excessive thickness from initial thickness) From the point of corrosion loss being unacceptable), it is extremely important to secure a certain amount or more of the solid solution Cu in the surface layer of the steel material.
  • Solid solution Cu content in surface layer of steel material 0.40 mass% or less, and [% solid solution Cu] / [% Cu] ⁇ 0.35 --- (1)
  • Cu ions combine with corrosive anions such as S 2- and the like in a low pH environment to form a sparingly soluble Cu compound on the steel surface, thereby protecting the surface of the steel, and under the upper deck rear surface environment. Inhibit the development of general corrosion on the surface and pitting corrosion in the bottom plate environment.
  • Cu ions are generated when Cu dissolved in solid solution in the base material dissolves in the base material by a corrosion reaction.
  • [% solid solution Cu] in the above-mentioned Formula (1) is the amount (mass%) of solid solution Cu in the surface layer part of steel materials. Moreover, [%] is Cu content (mass%) in the said component composition.
  • the amount of solid solution Cu in the surface layer portion of the steel material is 0.40 mass% or less. Preferably it is 0.35 mass% or less.
  • the amount of solid solution Cu in the surface layer part of steel materials is calculated
  • the resulting precipitate is decomposed and made into a solution with an acid, and then analyzed by ICP emission spectrometry to measure the amount of Cu precipitate. Thereafter, the amount of the measured precipitates is reduced from the Cu content in the component composition to determine the amount of solid solution Cu in the surface layer portion of the steel material.
  • the ratio of the amount of solid solution Cu in the surface layer portion of the steel material to the Cu content in the component composition largely changes depending on the manufacturing conditions even if the component composition is the same. Therefore, in order to control the ratio of the amount of solid solution Cu in the surface layer portion of the steel material to the Cu content in the component composition within an appropriate range, as described later, the manufacturing conditions, particularly the heating atmosphere of the slab before hot rolling It is extremely important to properly control the heating time and holding temperature, and the cooling rate after hot rolling.
  • the surface roughness of the steel material it is preferable to control the surface roughness of the steel material. Specifically, it is preferable to set the arithmetic average roughness Ra measured according to the definition of JIS B 0601-2001 to 0.02 to 100 ⁇ m.
  • the preferred thickness of the steel is about 5 to 60 mm.
  • the molten steel having the above-described composition is melted in a known furnace such as a converter or an electric furnace, and made into a steel material such as a slab or billet by a known method such as a continuous casting method or a block forming method.
  • a known furnace such as a converter or an electric furnace
  • the component adjustment method of molten steel should just follow the well-known steel smelting method.
  • the above-described steel material is hot-rolled to a desired shape. It is extremely important to carry out hot rolling after heating the steel material to a temperature of 1020 ° C. or more in an atmosphere with an oxygen concentration of 0.02 to 18.0% by volume and holding it for 20 minutes or more. That is, the lower the heating temperature, the slower the oxidation rate on the surface of the steel material. Therefore, liquid phase Cu remains on the surface of the steel material without being discharged to the scale side, and eventually penetrates into austenite grain boundaries. Since the solid solution Cu in the austenite grain easily diffuses to the liquid phase Cu infiltrated into the austenite grain boundary, it becomes impossible to secure a sufficient amount of solid solution Cu in the surface layer portion of the steel material to be the final product.
  • the heating temperature is 1020 ° C. or higher. Preferably it is 1030 degreeC or more, More preferably, it is 1040 degreeC or more. However, if the heating temperature exceeds 1350 ° C., surface marks may be generated or scale loss and fuel consumption may increase. Therefore, the heating temperature is preferably 1350 ° C. or less. More preferably, it is 1300 ° C. or less.
  • the holding time is set to 20 minutes or more. Preferably it is 120 min or more.
  • the upper limit of the holding time is not particularly limited, but is preferably 900 minutes from the viewpoint of productivity and the like.
  • the oxygen concentration in the heating atmosphere (hereinafter also referred to as a heating atmosphere) of the steel material is also an important control factor that affects the amount of solid solution Cu in the surface layer of the steel material. That is, when the oxygen concentration in the heating atmosphere is less than 0.02% by volume, the outward diffusion of Fe 2+ ions becomes extremely dominant in the oxidation process because of the environment with low oxygen potential, whereby the surface of the steel material is In addition, compact FeO is formed as a scale compound. Fine FeO increases the wettability of liquid phase Cu on the surface of the steel material and promotes the penetration of liquid phase Cu into austenite grain boundaries.
  • the solid solution Cu in the austenite grain easily diffuses into the liquid phase Cu infiltrated into the austenite grain boundary, if the penetration of the liquid phase Cu into the austenite grain boundary is promoted, the surface layer of the final product The amount of solid solution Cu in the part decreases.
  • the oxygen concentration in the heating atmosphere exceeds 18% by volume, the internal oxidation of the steel material proceeds excessively and austenite grain boundaries (not the liquid phase Cu formed on the surface of the steel material penetrates) directly
  • the formation of the liquid phase Cu causes the solid solution Cu in the austenite grains to diffuse to the liquid phase Cu, thereby reducing the amount of solid solution Cu.
  • the increase in scale loss also becomes remarkable.
  • the oxygen concentration in the heating atmosphere needs to be 18% by volume or less. Preferably it is 16 volume% or less, More preferably, it is 14 volume% or less.
  • the gases other than oxygen in the heating atmosphere are not particularly limited, and inert gases, hydrocarbons, combustion produced gases and the like may be used, and specifically, nitrogen, hydrogen, H 2 O, carbon dioxide, Carbon monoxide, methane, formaldehyde and the like can be mentioned.
  • the finish rolling end temperature it is preferable to make the finish rolling end temperature appropriate, specifically, 680 ° C. or more and 900 ° C. or less.
  • the finish rolling finish temperature is less than 680 ° C.
  • the rolling load increases due to the increase of the deformation resistance, and a large load is applied to the implementation of the rolling.
  • the precipitation of the Cu compound is started from the processing strain portion, and the amount of solid solution Cu in the surface layer portion of the steel material, that is, [% solid solution Cu] / [% Cu] decreases.
  • the finish rolling end temperature exceeds 900 ° C., desired strength may not be obtained.
  • cooling of the steel material after hot rolling may be either air cooling or accelerated cooling as long as a sufficient amount of solid solution Cu in the surface layer of the steel material can be secured.
  • accelerated cooling by setting the cooling rate to 4 to 100 ° C./s and the cooling stop temperature to 650 to 300 ° C., a predetermined amount of solid solution Cu can be obtained in the surface layer portion of the steel material. That is, when the cooling rate is less than 4 ° C./s or the cooling stop temperature is more than 650 ° C., the deposition of the Cu compound is not sufficiently suppressed, and the desired amount of solid solution Cu can not be obtained in the surface layer portion of the steel material.
  • the cooling rate is more than 100 ° C./s and the cooling stop temperature is less than 300 ° C., the toughness of the steel material is lowered or distortion occurs in the shape of the steel material.
  • reheating treatment, acidity and cold rolling may be performed to obtain a cold-rolled steel plate having a predetermined thickness.
  • the production conditions other than those described above are not particularly limited, and may be in accordance with a conventional method.
  • Example 1 Molten steels having the component compositions (the balance being Fe and unavoidable impurities) shown in Table 1 were melted and continuously cast by a commonly known method to form a slab. This slab is heated under the conditions shown in Table 2, and then hot rolled under the conditions shown in Table 2 to form a hot-rolled steel plate with a thickness of 40 mm, and water cooling under the conditions shown in Table 2 to a cooling stop temperature of 450 ° C. Accelerated cooling. In the heating atmosphere in slab heating, oxygen was defined as volume% described in Table 2, and gases other than oxygen were volume%, CO 2 : 13%, CH 2 O: 14%, N 2 : remaining part. Next, after removing the oxide film called black skin on the surface of the obtained steel material, a test specimen of the size described later is collected, and the amount of solid solution Cu in the surface layer of the steel material is measured by the following method, The corrosion resistance was evaluated.
  • This corrosion test apparatus is composed of a corrosion test tank 2 and a temperature control plate 3, and water 6 whose temperature is kept at 30 ° C. is injected into the corrosion test tank 2. Further, in the water 6, through the introduction gas pipe 4, 13% by volume CO 2 , 4% by volume O 2 , 0.01% by volume SO 2 , 0.05% by volume H 2 S, and the remaining portion N 2 Thus, the corrosion test tank 2 is filled with supersaturated steam to reproduce the corrosive environment on the back surface of the upper deck of the crude oil tanker. Then, a corrosion test piece 1 is set on the upper surface and the back surface of the corrosion test tank 2, and the corrosion test piece 1 is heated to 25 ° C. for 1.5 hours via 50 ° C.
  • reference numeral 5 denotes an exhaust gas pipe from the corrosion test tank 2.
  • FIG. 2 11 shows the exhaust gas pipe from a test tank.
  • ⁇ (pass) The corrosion depth at the artificial defect is less than 20 ⁇ m
  • ⁇ (fail) The corrosion depth at the artificial defect is 20 ⁇ m or more
  • the test solution was previously heated and maintained at 30 ° C., and was replaced with a new test solution every 24 hours.
  • the apparatus used for this test is shown in FIG.
  • This corrosion test apparatus is a double structure apparatus of a corrosion test tank 12 and a constant temperature tank 13.
  • the above-mentioned test solution 14 is put in the corrosion test tank 12, and the corrosion test piece 15 is suspended with tegs 16 in it. It is immersed.
  • the temperature of the test solution 14 is maintained by adjusting the temperature of the water 17 contained in the constant temperature bath 13.

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Abstract

L'invention concerne un matériau en acier résistant à la corrosion pour une tôle de pont et une tôle de fond d'un pétrolier transportant du brut qui peut être utilisé soit pour la tôle de pont soit pour la tôle de fond et qui a une excellente résistance à la corrosion générale ainsi qu'une excellente résistance à la corrosion localisée. Le matériau en acier a une composition de composants prédéfinie, la quantité de Cu en solution dans la couche de surface du matériau en acier est inférieure ou égale à 0,40 % en masse et la relation de l'expression (1) est satisfaite. (1) : [Pourcentage de Cu en solution]/[pourcentage de Cu] ≥ 0,35
PCT/JP2018/040742 2017-11-24 2018-11-01 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 WO2019102817A1 (fr)

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JP2019518130A JP6536769B1 (ja) 2017-11-24 2018-11-01 原油タンカー上甲板および底板用耐食鋼材、ならびに、原油タンカー
KR1020207016711A KR102430613B1 (ko) 2017-11-24 2018-11-01 원유 탱커 상갑판 및 바닥판용 내식 강재, 그리고 원유 탱커
CN201880075730.4A CN111386357B (zh) 2017-11-24 2018-11-01 原油油船上甲板和底板用耐腐蚀钢材以及原油油船
PH12020550666A PH12020550666A1 (en) 2017-11-24 2020-05-20 Corrosion-resistant steel material for deck plate and bottom plate of crude oil tanker and crude oil tanker

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