CN102892914A - Welded joint having excellent corrosion resistance and crude oil tank - Google Patents

Welded joint having excellent corrosion resistance and crude oil tank Download PDF

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Publication number
CN102892914A
CN102892914A CN2011800242715A CN201180024271A CN102892914A CN 102892914 A CN102892914 A CN 102892914A CN 2011800242715 A CN2011800242715 A CN 2011800242715A CN 201180024271 A CN201180024271 A CN 201180024271A CN 102892914 A CN102892914 A CN 102892914A
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quality
welding
steel
corrosion
metal
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CN102892914B (en
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钓之郎
小森务
角博幸
大井健次
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JFE Steel Corp
JFE Engineering Corp
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NKK Corp
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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

Abstract

Disclosed are: a welded joint which is capable of significantly reducing overall corrosion or local corrosion that occurs in a crude oil tank; and a crude oil tank which comprises the welded joint. Specifically disclosed is a crude oil tank that comprises a welded joint which is formed by welding steel materials each containing, in mass%, 0.03-0.16% of C, 0.05-1.50% of Si, 0.1-2.0% of Mn, 0.025% or less of P, 0.010% or less of S, 0.005-0.10% of Al, 0.008% or less of N, more than 0.1% but 0.5% or less of Cr and 0.03-0.4% of Cu, and additionally containing one or more elements selected from among 0.01-1.0% of W, 0.01-0.5% of Mo, 0.001-0.2% of Sn and 0.001-0.4% of Sb. The welded joint is also characterized in that Cu, Mo and W in the welded metal satisfy the following relations: 3 < (Cu in the welded metal)/ (Cu in the matrix) = 7 and 1 = (Cu in the welded metal)/{(Mo + W) in the welded metal} = 10.

Description

The welding joint of excellent corrosion resistance and petroleum tank
Technical field
The present invention relates to steel welding and the oil groove (oil tank) of the crude oil carrier (crude oil tanker) that forms, for delivery of or the tank of storage crude oil (crude oil) (below, be referred to as " petroleum tank (crude oil tank) "), in particular to the welding joint (weld joint) that has alleviated the local corrosion (local corrosion) (spot corrosion (pitting corrosion)) in the above-mentioned petroleum tank with have the petroleum tank of this welding joint.Should illustrate that the steel that use in the petroleum tank of the present invention comprise Plate Steel (thick steel plate), steel sheet (thin steel sheet) and shaped steel (shaped steel).
Background technology
In the past, internal surface, particularly upperdeck (sun deck) back side (back side) and the employed steel of side wall upper part of known petroleum tank at oil carrier can produce whole corrosion.As the reason that this whole corrosion occurs, can enumerate following several etc.:
(1) because of due to the temperature head round the clock in the repeatedly generation of surface of steel plate dewfall (dew drop) with dry (doing wet (wetting and drying)),
(2) enclose the interior rare gas element (inert gases) of petroleum tank (with the O of about 5vol% for explosion-proof and quilt 2, about 13vol% CO 2, about 0.01vol% SO 2, surplus N 2Be boiler (boiler) that representative forms or the Exhaust Gas (exhaust gas) of engine (engine) etc.) in O 2, CO 2, SO 2To dissolving in of dew (dew condensation water),
(3) H that from crude oil, volatilizees 2The corrosive gasess such as S (corrosive gas) dissolve in to dew,
(4) seawater that uses in the cleaning of petroleum tank residual.
These reasons also can be peeped from following content and be known: in the investigation of the harbour inspection (dock inspection) of per real ship that carried out in 2.5 years, detect sulfate ion, chloride ion (chloride ion) (Cl in highly acid dew -).
And then, if come oxidation H with the iron rust that generates because of corrosion as catalyzer 2S, then solid S layeredly is created in the iron rust, but these corrosion products peel off easily and come off, and are deposited in the petroleum tank bottom.Therefore, present situation is in harbour checks, expends a large amount of expenses and carries out the repairing on tank top, the recovery of pot bottom stores.
The effect of corrosion inhibition (corrosion suppression action) of the protective coating from crude oil (protective coating) (oil reservoir (oil coating)) that on the other hand, think the effect of corrosion inhibition by crude oil itself of the steel that in the base plate of the petroleum tank of oil carrier etc., use, forms at the petroleum tank internal surface and can not produce corrosion.But, by nearest research, find out in the steel of tank bottom, to produce bowl type (bowl-shaped) local corrosion (local corrosion) (spot corrosion (pitting corrosion)).As the reason that this local corrosion occurs, can enumerate following several etc.:
(1) the salt high density take sodium-chlor (sodium chloride) as representative is dissolved the existence of the agglutinating water (brine, salt solution) that forms,
(2) because the oil reservoir due to excessively cleaning breaks away from,
The high density of the sulfide that (3) contains in the crude oil (sulfide),
(4) dissolve in the explosion-proof with the O in the rare gas element of dew 2, CO 2, SO 2Deng high density.
In fact, when the harbour of real ship checks, analyze among the result who is trapped in the water in the petroleum tank, detect chloride ion and the sulfate ion of high density.
Yet the effective means that prevents whole corrosion as described above and local corrosion is to cover (heavy coating) by implementing recoat at steel surface, and steel are cut off from corrosive environment (corrosion environment).But with regard to the coating operation of petroleum tank, the area of its coating is huge, in addition, because it is deteriorated to film, causes just need to again applying 1 time in about 10 years, so produced huge expense in checking, applying.And then being pointed out through the impaired part of filming that recoat covers on the contrary can corrosion promoting under the corrosive environment at petroleum tank.
For etching problem as described above, proposed somely to improve the erosion resistance of steel itself and improve the technology of the erosion resistance of petroleum tank under corrosive environment.Following technology is for example disclosed in patent documentation 1: will be in quality %, contain that C:0.001～0.2%, Si:0.01～2.5%, Mn:0.1～2%, P:0.03% are following, S:0.02% is following, Cu:0.01～1.5%, Al:0.001～0.3%, N:0.001～0.01%, and then, contain a kind or 2 kinds in Mo:0.01～0.5% and W:0.01～1%, surplus by Fe and inevitably the steel that consist of of impurity be welded to one another and when forming welding joint, the mode that satisfies following 3 formulas with the content of the Cu in the welding metal, Mo, W forms welding joint.
The Cu content (quality %) 〉=0.153 of the Cu content (quality %) of 3 〉=welding metal/steel 〉=(the Mo content of welding metal+W content (quality %))/(the Mo content of steel+W content (quality %)) 〉=0.15
﹣ 0.3≤(the Cu content (quality %) of the Cu content (quality %) of welding metal-steel)≤0.5
In addition, following technology is disclosed in patent documentation 2: will be in quality %, contain that C:0.001～0.2%, Si:0.01～2.5%, Mn:0.1～2%, P:0.03% are following, S:0.02% is following, Cu:0.01～1.5%, Al:0.001～0.3%, N:0.001～0.01%, and then, contain in Mo:0.01～0.5% and W:0.01～1% a kind or 2 kinds, surplus by Fe and inevitably the steel that consist of of impurity be welded to one another and when forming crude oil tank, the mode that satisfies following 2 formulas with the content of the Cu in the welding metal, Mo, W forms welding joint.
The Cu content (quality %) 〉=0.153 of the Cu content (quality %) of 3 〉=welding metal/steel 〉=(the Mo content of welding metal+W content (quality %))/(the Mo content of steel+W content (quality %)) 〉=0.15
Patent documentation
Patent documentation 1: TOHKEMY 2005-21981 communique
Patent documentation 2: TOHKEMY 2005-23421 communique
Summary of the invention
Yet in the technology that patent documentation 1 and patent documentation 2 are put down in writing, the local corrosion (spot corrosion) that is difficult to produce in oil carrier base plate and the welding joint was suppressed at below the 4mm between 2.5 years.In other words, in the Investigation On Corrosion of real ship in recent years, the pH that has found out the solution of the spot corrosion inside that results from oil carrier base plate and weld part is (research of the new shape corrosion movement of reference the 242nd research department meeting crude oil carrier is with reference to putting down into 13 annual reports book/Japan shipbuilding research department of Corporation proceedings) below 1.0.Usually, well-known is that Corrosion Of Steel speed in the Acidic Liquid is controlled by hydrogen reduction reaction, and corrosion speed enlarges markedly when pH reduces.Therefore, as putting down in writing among the embodiment of above-mentioned patent documentation 1 and patent documentation 2 in the dip test under the pH2.0, fully do not reflect the corrosive environment of real ship.
In addition, with regard to the steel of the prior aries such as above-mentioned patent documentation 1 and patent documentation 2, as the element that improves erosion resistance, must add Cu, but Cu be added on hot rolling the time cause surface crack, so exist infringement to make the problem of stability.
Therefore, the object of the present invention is to provide a kind of excellent steel of manufacturing (manufacturability) that do not cause the problems such as crackle during with hot rolling to weld to form, the welding joint of anti-whole corrodibility in the petroleum tank of oil carrier oil groove section etc., anti-local corrosion excellence and have the petroleum tank of this welding joint.
The inventor etc. have carried out repeatedly further investigation in order to solve above-mentioned problem.It found that, when forming petroleum tank by the steel that the composition composition control of steel improved erosion resistance at optimum range in welding, the content of the Cu that contains in the welding metal with welding joint, Mo and W is controlled at optimum range, can significantly alleviate whole the burn into local corrosion that produces in the welding joint of petroleum tank, thereby finish the present invention.
Namely, the present invention is a kind of welding joint of excellent corrosion resistance, it is characterized in that, steel to be welded to one another and the welding joint of the petroleum tank that forms, described steel contain C:0.03～0.16 quality %, Si:0.05～1.50 quality %, Mn:0.1～2.0 quality %, below the P:0.025 quality %, below the S:0.010 quality %, Al:0.005～0.10 quality %, below the N:0.008 quality %, Cr: surpass 0.1 quality % and be below the 0.5 quality %, Cu:0.03～0.4 quality %, and, contain and be selected from W:0.01～1.0 quality %, Mo:0.01～0.5 quality %, Sn:0.001～0.2 quality %, and one kind or two or more among Sb:0.001～0.4 quality %, and then, take by the X value of following (1) formula definition as below 0.5, be that mode 0.15 below contains mentioned component by the Z value of following (2) formula definition, surplus is made of with inevitable impurity Fe; In the mother metal and the Cu, the Mo that contain in the welding metal of welding joint and W satisfy following (3) formula and (4) formula;
X value=(1-0.8 * Cu 0.5) * { 1-(0.8 * W+0.4 * Mo) 0.3} * { 1-(Sn+0.4 * Sb) 0.3} * { 1-(0.05 * Cr+0.03 * Ni+0.03 * Co) 0.3} * { 1+2 * (S/0.01+P/0.025) } ... (1)
The Z value=(1+10 * Sn) * (Cu-0.7 * Ni) ... (2)
3＜{ Cu in the welding metal }/{ Cu in the mother metal }≤7 ... (3)
1≤(Cu in the welding metal)/{ (Mo+W) in the welding metal }≤10 ... (4)
At this, the symbol of element in the above-mentioned formula represents the content (quality %) of each element.
In addition, the steel that use in the welding joint of the present invention is characterized in that, on the basis that mentioned component forms, further contain the composition that is selected from least 1 group in following A～D group.
A group: be selected from a kind or 2 kinds among Ni:0.005～0.4 quality % and Co:0.01～0.4 quality %
B group: be selected from one kind or two or more among Nb:0.001～0.1 quality %, Ti:0.001～0.1 quality %, Zr:0.001～0.1 quality % and V:0.002～0.2 quality %
C group: be selected from one kind or two or more among Ca:0.0002～0.01 quality %, REM:0.0002～0.015 quality % and Y:0.0001～0.1 quality %
D group: B:0.0002～0.003 quality %
In addition, the present invention is a kind of petroleum tank, it is characterized in that, has above-mentioned welding joint.
According to the present invention, whole the burn into local corrosion that produces in can the petroleum tank of the formation not only comprising steel plate also to comprise the welding such as the oil groove, conveying of whole positions crude oil for inhibiting ship of welding joint or the tank of storage crude oil is so industrially play particularly preferred effect.
Description of drawings
Fig. 1 is the figure that is used for the testing apparatus of whole corrosion test in the explanation embodiments of the invention.
Fig. 2 is the figure that is used for the testing apparatus of pittingtest in the explanation embodiments of the invention.
The figure of Fig. 3 impact (base plate and upper plate) that to be the expression weld metal composition cause with the erosion resistance of the welding joint of corrosion-resistant steel tank.
Embodiment
At first, the one-tenth of the steel that use in the petroleum tank of the present invention is grouped into describes.
C:0.03～0.16 quality %
C is the element that improves the intensity of steel, in the present invention, in order to ensure desirable intensity, adds the above C of 0.03 quality %.On the other hand, the interpolation above 0.16 quality % can make the toughness (toughness) of weldability (weldability) and welding heat affected zone (welded heat affected zone) reduce.Thus, C is made as the scope of 0.03～0.16 quality %.The more preferably scope of 0.06～0.16 quality %.
Si:0.05～1.50 quality %
Si is the element that adds as de-acidying agent, also is to improving the effective element of intensity of steel.Therefore, in the present invention, in order to ensure desirable intensity, add the above Si of 0.05 quality %.But the interpolation that surpasses 1.50 quality % can make the toughness drop of steel.Thus, Si is made as the scope of 0.05～1.50 quality %.The more preferably scope of 0.15～0.50 quality %.
Mn:0.1～2.0 quality %
Mn is the element that improves the intensity of steel, in the present invention, in order to obtain desirable intensity, adds the above Mn of 0.1 quality %.On the other hand, the interpolation above 2.0 quality % can make the toughness of steel and weldability reduce.Thus, Mn is made as the scope of 0.1～2.0 quality %.Should illustrate, make the viewpoint of formation of the inclusion of erosion resistance variation from keeping high strength and inhibition, the scope of preferred 0.5～1.6 quality %, the more preferably scope of 0.7～1.4 quality %.
Below the P:0.025 quality %
P is the harmful element that makes the toughness drop of steel in the grain boundary segregation, preferably reduces as much as possible.Particularly, surpass 0.025 quality % if add, then toughness significantly reduces.In addition, surpass 0.025 quality % if add, then can bring bad impact to the erosion resistance in the tank oil groove.Thus, P is made as below the 0.025 quality %.Be preferably below the 0.015 quality %.
Below the S:0.010 quality %
S can form the MnS as non-metallic inclusion (non-metal inclusion), becomes the starting point of local corrosion, is the harmful element that makes anti-local corrosion reduction, preferably reduces as much as possible.Particularly, can cause the remarkable reduction of anti-local corrosion above the interpolation of 0.010 quality %.Thus, the upper limit with S is made as 0.010 quality %.Be preferably below the 0.005 quality %.
Al:0.005～0.10 quality %
Al is the element that adds as de-acidying agent, in the present invention, adds the above Al of 0.005 quality %.But if add to surpass 0.10 quality %, the toughness drop of steel then is so be made as 0.10 quality % with the upper limit of Al.Be preferably the scope of 0.01～0.05 quality %.The scope of 0.02～0.04 quality % more preferably.
Below the N:0.008 quality %
N is the harmful element that makes toughness drop, preferably reduces as much as possible.Particularly, surpass 0.008 quality % if add, then toughness significantly reduces, so the upper limit is made as 0.008 quality %.Be preferably below the 0.006 quality %, more preferably below the 0.004 quality %.
Cr: surpass 0.1 quality % and be below the 0.5 quality %
Cr is accompanied by the carrying out of corrosion and moves in rusty scale, by cutting off Cl -To the intrusion of rusty scale and suppress Cl -Concentrated to rusty scale and ferritic interface.In addition, when coating contains the priming paint (primer) of Zn, can form Cr, Zn composite oxides centered by Fe, make the long-time survival of Zn in surface of steel plate, so can improve by leaps and bounds erosion resistance.Above-mentioned effect is remarkable especially in the part with the liquid contact that contains the high density salinity that separates from the crude oil oil content as the base plate of oil carrier oil groove, by the steel of the above-mentioned part that contains Cr being implemented to contain the prime treatment of Zn, thereby compare with the steel that do not contain Cr, can especially improve erosion resistance.With regard to the effect of above-mentioned Cr, if add 0.1 quality % with next insufficient, on the other hand, the interpolation that surpasses 0.5 quality % can make the toughness variation of weld part.Therefore, Cr is made as surpasses 0.1 quality % and be scope below the 0.5 quality %.The more preferably scope of 0.11～0.3 quality %.The scope of further preferred 0.12～0.2 quality %.
Cu:0.03～0.4 quality %
Cu is the element that improves the intensity of steel, and is present in the corrosion of invar and in the rust that generates, has the effect that improves erosion resistance.These effects can't obtain when interpolation is lower than 0.03 quality % fully, on the other hand, if add to surpass 0.4 quality %, then except the effect that improves erosion resistance is saturated, also can cause the problems such as surface crack when hot-work.Therefore, from the stable viewpoint of making steel of the present invention, need to add Cu with the scope of 0.03～0.4 quality %.Should illustrate that the effect that Cu adds is accompanied by the increase of addition and saturated, so from cost-benefit viewpoint, the scope of preferred 0.008～0.15 quality %.The more preferably scope of 0.01～0.14 quality %.
With regard to steel of the present invention, except mentioned component, also need to following ranges contain be selected among W, Mo, Sn and the Sb more than a kind or 2 kinds.
W:0.01～1.0 quality %
W also has the effect of whole the corrosion that suppresses oil carrier upperdeck section except having the effect that suppresses the spot corrosion in the oil carrier oil groove section base plate.Show during the W of above-mentioned effect more than adding 0.01 quality %.But if surpass 1.0 quality %, then this effect is saturated.Thus, add W with the scope of 0.01～1.0 quality %.Be preferably the scope of 0.01～0.5 quality %, more preferably the scope of 0.02～0.3 quality %.
Should illustrate that W has the reasons are as follows of effect of raising erosion resistance as described above: generate WO in the rust that generates being accompanied by steel plate corrosion 4 2-, because this WO 4 2-Existence, can suppress chloride ion (chloride ion) and invade surface of steel plate, and then, at the position that the pH such as anode portion (anode) of surface of steel plate descend, generate FeWO 4, because of this FeWO 4Existence, also can suppress chloride ion to the intrusion of surface of steel plate.In addition, think by by WO 4 2-Restraining effect (inhibitory action) to the absorption of steel surface causes also can suppress the corrosion of steel.
Mo:0.01～0.5 quality %
Mo not only has the effect that suppresses the spot corrosion in the oil carrier oil groove section base plate, also has anti-whole the corrodibility that improves oil carrier upperdeck back part, the effect of the erosion resistance after the coating in the corrosive environment that salt water retting and high-humidity occur as ballast box (ballast tank) repeatedly.The effect of above-mentioned Mo shows when interpolation 0.01 quality % is above, if but above 0.5 quality %, then its effect is saturated.Therefore, Mo is made as the scope of 0.01～0.5 quality %.Be preferably the scope of 0.02～0.5 quality %, more preferably the scope of 0.03～0.4 quality %.
Should illustrate that the reason that Mo has the effect of raising erosion resistance as described above is thought as follows: identical with W, generate MoO in the rust that generates in the corrosion that is accompanied by steel plate 4 2-, because this MoO 4 2-Existence, can suppress chloride ion to the intrusion of surface of steel plate.
Sn:0.001～0.2 quality %, Sb:0.001～0.4 quality %
Sn and Sb also have the effect of whole the corrosion that suppresses oil carrier upperdeck section except having the effect that suppresses the spot corrosion in the oil carrier oil groove section base plate.Above-mentioned effect more than adding Sn:0.001 quality %, Sb:0.001 quality % shows when above.On the other hand, even with Sn: surpass 0.2 quality % and Sb: the mode that surpasses 0.4 quality % is added, and its effect is also saturated.And then, the surface crack when adding in a large number Sn and can encourage the hot-work that causes because of Cu.Thus, preferably add Sn and Sb with above-mentioned scope respectively.
In addition, with regard to steel of the present invention, except as the above-mentioned essential composition, also preferably contain a kind or 2 kinds that is selected among Ni and the Co with following ranges.
Ni:0.005～0.4 quality %, Co:0.01～0.4 quality %
Ni and Co have the rust particle miniaturization of the generation of making and significantly improve the erosion resistance under naked state and yellow zinc chromate primer paint (zinc primer) has been implemented the effect of the erosion resistance under the state of epoxies coating (epoxy coating).Therefore, further improve at needs in the situation of erosion resistance, preferably auxiliarily add these elements.Above-mentioned effect more than adding Ni:0.005 quality %, Co:0.01 quality % shows when above.On the other hand, even with Ni: surpass 0.4 quality %, Co: the mode that surpasses 0.4 quality % is added, and its effect is also saturated.In addition, Ni has the effect of the surface crack when suppressing to contain the hot-work that produces in the steel of Cu, Sn.Therefore, preferably add Ni and Co with above-mentioned scope respectively.
In addition, with regard to steel of the present invention, on the basis of containing above-mentioned essential composition and selectivity added ingredients (Ni, Co) with above-mentioned optimum range, the mode that also further need to satisfy below 0.5 with the X value that defines in following (1) formula contains these compositions;
X value=(1-0.8 * Cu 0.5) * { 1-(0.8 * W+0.4 * Mo) 0.3} * { 1-(Sn+0.4 * Sb) 0.3} * { 1-(0.05 * Cr+0.03 * Ni+0.03 * Co) 0.3} * { 1+2 * (S/0.01+P/0.025) } ... (1)
At this, the symbol of element in the above-mentioned formula represents the content (quality %) of its element, and the element that does not contain is with 0(zero) calculate.
Above-mentioned (1) formula is to estimate the formula of the impact that each composition causes the corrosion in the oil carrier oil groove, the coefficient table of composition that erosion resistance is improved is shown negative, and the coefficient table of the composition of erosion resistance variation just will be shown.Therefore, the steel that the value of X is less, erosion resistance is more excellent.The inventor etc. have found out the relation between the erosion resistance of the value of above-mentioned X and the steel under the corrosive environment in the oil carrier oil groove, found that if X is below 0.5, the excellent corrosion resistance under the corrosive environment in the oil carrier oil groove then is if but X surpasses 0.5, above-mentioned erosion resistance variation then.Thus, with regard to steel of the present invention, when determining the content of P, S, Cr, Cu, W, Mo, Sn, Sb, Ni and Co, need to carry out Composition Design in the mode that above-mentioned X value becomes below 0.5.
And then, with regard to steel of the present invention, containing with above-mentioned optimum range on the basis of mentioned component, also need to be to contain Cu, Sn and Ni by the Z value of following (2) formula definition as the mode below 0.15;
The Z value=(1+10 * Sn) * (Cu-0.7 * Ni) ... (2)
At this, the symbol of element in the above-mentioned formula represents the content (quality %) of its element, and the element that does not contain is with 0(zero) calculate.Its reason is, Cu is the element of the surface crack when causing hot-work, and in addition, Sn is the element that encourages by the crackle due to the above-mentioned Cu.On the other hand, Ni is to preventing by the effective element of harm due to the above-mentioned element, but in order to show the above-mentioned effect of Ni, and mode that need to above-mentioned to satisfy (2) formula is added Ni.
In addition, with regard to steel of the present invention, for the purpose of the intensity that improves steel, on the basis of mentioned component, can also add with following ranges being selected from one kind or two or more among Nb, Ti, V and the Zr.
Nb:0.001～0.1 quality %, Ti:0.001～0.1 quality %, Zr:0.001～0.1 quality % and V:0.002～0.2 quality %
Nb, Ti, Zr and V all are the elements that improve steel strength, can intensity as required suitably select to add.In order to obtain above-mentioned effect, preferred Nb, Ti, Zr all add more than the 0.001 quality %, V adds more than the 0.002 quality %.But if Nb, Ti, Zr all add and surpass 0.1 quality %, V and add and surpass 0.2 quality %, toughness drop then is so preferably add Nb, Ti, Zr, V with above-mentioned scope respectively.
And then, with regard to steel of the present invention, in order to improve intensity or to improve toughness, on the basis of mentioned component, can also add with following ranges being selected from one kind or two or more among Ca, REM and the Y.
Ca:0.0002～0.01 quality %, REM:0.0002～0.015 quality % and Y:0.0001～0.1 quality %
Ca, REM and Y all produce effect to the toughness raising of welding heat affected zone, can add as required.Above-mentioned effect more than adding Ca:0.0002 quality %, more than the REM:0.0002 quality %, Y:0.0001 quality % obtains when above, if add in the mode that surpasses Ca:0.01 quality %, REM:0.015 quality %, Y:0.1 quality %, then can cause on the contrary the reduction of toughness, so preferably add Ca, REM, Y with above-mentioned scope respectively.
And then, with regard to steel of the present invention, on the basis of mentioned component, can also contain B with following ranges.
B:0.0002～0.003 quality %
B is the element that improves the intensity of steel, can add as required.In order to obtain above-mentioned effect, preferably add more than the 0.0002 quality %.But, surpass 0.003 quality %, then toughness drop if add.Thus, preferably add B with the scope of 0.0002～0.003 quality %.
Should illustrate that the optimum selection of steels that uses in the petroleum tank of the present invention is made in accordance with the following methods.
Namely, the following manufacturing of optimum selection of steels of the present invention: use converter (steel converter) or electric furnace (electric furnace), the known refining procedures (refinery process) such as vacuum outgas (vacuum degassing equipment), be fit to the steel that one-tenth of the present invention is grouped into and carry out melting being adjusted to, utilize Continuous casting process (continuous casting process) or ingot casting-split rolling method method to make steel billet (plate slab (steel slab)), then, this material is reheated, then carry out hot rolling (hot rolling), make Plate Steel, the steel such as steel sheet and shaped steel.
Preferably with the temperature that temperature is made as 900～1200 ℃ that reheats before the above-mentioned hot rolling.When Heating temperature was lower than 900 ℃, resistance to deformation was large, was difficult to carry out hot rolling.On the other hand, if Heating temperature surpasses 1200 ℃, thickization of austenite grain (austenite grain) then, cause the reduction of toughness, in addition, also become significantly by the oxidization burning loss due to the oxidation (scale loss), yield rate (yield ratio) reduces.Preferred Heating temperature is 1000～1150 ℃.
In addition, when being rolled into the steel of desirable shape, size in the hot rolling, preferably the finish rolling end temp is made as more than 750 ℃.When being lower than 750 ℃, it is large that the resistance to deformation of steel becomes, and rolling load increases, and is difficult to be rolled, or produces waiting time till the rolling temperature that rolled stock reaches regulation, so the rolling efficiency reduction.
The cooling of the steel after the hot rolling can be air cooling (air cooling), accelerate any means in the cooling (accelerated cooling), in the time of need to obtaining more high strength, preferably accelerates cooling.Should illustrate, when accelerating to cool off, preferably speed of cooling is made as 2～80 ℃/sec, cooling is stopped the scope that temperature is made as 650～300 ℃.Speed of cooling is lower than 2 ℃/sec, cools off when stopping temperature above 650 ℃, and the effect of accelerating cooling is little, can't realize sufficient high strength.On the other hand, when speed of cooling surpasses 80 ℃/sec, cooling and stops temperature and be lower than 300 ℃, the toughness drop of the steel that obtain, or the shape of steel produces distortion.
The welding joint of the petroleum tank that next, forms welding steel of the present invention describes.
The steel plate that will make with regard to being adjusted to above-mentioned suitable composition is welded to one another and for the welding joint of the petroleum tank that forms, and mode that need to following to satisfy (3) formula contains Cu, Mo and the W in the welding metal.
3＜{ Cu in the welding metal }/{ Cu in the mother metal }≤7 ... (3)
Usually, under the erosion resistance of welding metal becomes situation than the corrosion-resistant of mother metal (steel), in the acid dipping test of spot corrosion inside of having simulated the oil carrier base plate described later, can promote the dissolving of the metal of weld part.In addition, because the erosion resistance of welding metal is improved with mother metal (steel), so when in welding metal, adding Sn, Sb, can't guarantee the low-temperature flexibility of welding joint.Therefore, need to improve with mother metal (steel) in the erosion resistance that welding metal is not contained under the condition of Sn, Sb welding metal.Therefore, the present invention has following characteristics, as the method for the erosion resistance that improves welding metal, is that value with { Cu in the welding metal }/{ Cu in the mother metal } is limited in the scope with above-mentioned (3) formula regulation.
{ Cu in the welding metal }/{ Cu in the mother metal } is 3 when following, the erosion resistance of welding metal becomes than the corrosion-resistant of mother metal (steel), so acid dipping of having simulated the spot corrosion inside of oil carrier base plate described later can promote the dissolving of the metal of weld part in testing.On the other hand, { Cu in the welding metal }/{ Cu in the mother metal } was above 7 o'clock, owing to added necessary above Cu, not only cause the cost of welding material (welding wire) to rise, and cause the erosion resistance of welding metal significantly to surpass the erosion resistance of mother metal, so under actual corrosive environment, understand the selective corrosion (selective corrosion) of generation mother metal.Thus, the Cu in the Cu in the welding metal and the mother metal (steel) need to satisfy above-mentioned (3) formula.{ Cu in the welding metal }/{ Cu in the mother metal } be 3～6 scope more preferably.Further preferred 3～5 scope.
In addition, the mode that the welding joint of petroleum tank of the present invention need to following to satisfy (4) formula contains Cu, Mo and the W in the welding metal;
1≤(Cu in the welding metal)/{ (Mo+W) in the welding metal }≤10 ... (4)
The discoveries such as the inventor are if also with adding Cu and Mo or W, then by the synergistic effect of these elements, can significantly improve the erosion resistance of welding joint.But, (4) (Cu in the welding metal) in the formula/{ (Mo+W) in the welding metal } is lower than at 1 o'clock, compares with Mo in the welding metal or the content of W, and the content of Cu is excessively low, can't expect above-mentioned synergistic effect, so the erosion resistance of welding joint reduces.On the other hand, (4) (Cu in the welding metal) in the formula/{ (Mo+W) in the welding metal } was above 10 o'clock, compare with the Cu content in the welding metal, the content of Mo or W is excessively low, still can't expect above-mentioned synergistic effect (synergy effect), so the erosion resistance of welding joint can reduce.Thus, the Cu in the welding metal, Mo and W need to satisfy above-mentioned (4) formula.Should illustrate that the Mo in the welding metal and the content of W also can not contain the either party among Mo and the W as long as its total amount satisfies in the scope of above-mentioned formula.(Cu in the welding metal)/{ (Mo+W) in the welding metal } be 1～5 scope more preferably.Further preferred 1～4 scope.
And then, the discoveries such as the inventor with regard to welding joint of the present invention, are being satisfied on the basis of above-mentioned condition, in the welding metal and the Mo in the mother metal (steel) and W when also satisfying following (5) formula, comprise that the erosion resistance at whole positions of mother metal (steel) and welding joint further improves;
1≤((Mo+W) in the welding metal)/((Mo+W) in the mother metal)≤10 ... (5)
As mentioned above, the invention is characterized in, under the condition that the low-temperature flexibility that does not make welding joint reduces, the erosion resistance of the welding metal erosion resistance with mother metal (steel) is improved, so in welding metal, do not contain in the situation of Sn, Sb, the value of { Cu in the welding metal }/{ Cu in the mother metal } be controlled at the proper range of stipulating in (3) formula.But in order further stably to improve the erosion resistance of welding metal, the value of more preferably ((Mo+W) in the welding metal)/((Mo+W) in the mother metal) is more than 1.On the other hand, ((Mo+W) in the welding metal)/((Mo+W) in the mother metal) was above 10 o'clock, owing to added necessary above Mo, W, not only cause the cost of welding material (welding wire) to rise, and the erosion resistance that causes welding metal significantly surpasses the erosion resistance of mother metal, so the selective corrosion of mother metal may occur.Thus, in the preferred weld metal and the Mo in the mother metal (steel) and W satisfy (5) formula.
Should illustrate that for the content with the Cu in the above-mentioned welding metal, Mo and W is controlled at above-mentioned scope, preferably the one-tenth according to steel (mother metal) is grouped into and welding conditions, suitably select the welding material (welding wire (weld wire)) that uses in the welding.Following method is for example arranged: make the welding wire with composition that the target composition of the Cu in the welding metal, Mo and W is tried to achieve by thinning ratio (dilution ratio) conversion of mother metal, use it to weld.
In addition, the welding process of using in the welding as petroleum tank of the present invention, can use FAB welding, FCB welding, the such high heat input welding (high-heat input welding) of RF welding as single face single track submerged arc welding method (one-side submerged arc welding), co3 gas arc welding meets (CO 2Welding (CO 2Arc welding)) such low_input_power welding (small-heat input welding) etc., but from the chemical ingredients composition control of welding metal is considered in the viewpoint of optimum range, need to be the welding process of using welding wire.
Should illustrate that at this, the FAB welding refers in the registered trademark relevant with the welding process of Kobe Steel Ltd., will directly be layered on the steel plate back side by the liner material that cellotape, solid flux etc. consists of, and forms the method for root run by the single track welding.In addition, the FCB welding refers in the registered trademark relevant with the welding process of Kobe Steel Ltd., scatters the liner solder flux at copper coin, by being pressed in the steel plate back side, forms the method for root run by the single track welding.In addition, the RF method refers in the registered trademark relevant with the welding process of Kobe Steel Ltd., to be layered on the steel plate back side containing the jig frame that overlapping basic solder flux forms under the liner solder flux of welding heat curable resin, press the solder flux in the press box, form the method for root run by the single track welding.
Embodiment
With vacuum melting furnace the steel with table 1-1 and heterogeneity composition of the No.1 shown in the table 1-2～36 is carried out melting and make steel ingot, or carry out melting with converter, continuous casting and make plate slab, after these are reheated 1150 ℃, making the finish rolling end temp is 800 ℃ hot rolling, makes the Plate Steel of thickness of slab 25mm.
For the Plate Steel of the No.1 that obtains thus～36, utilize magnetic-particle test investigation whether to have the crackle of surface of steel plate, be judged to be zero with what do not detect crackle, with detect being judged to be of crackle *.
Then, each steel plates of above-mentioned No.1～36 is welded according to the welding process of putting down in writing among table 2-1 and the table 2-2 each other and make welding joint.Should illustrate that for the heat input of each welding process, FCB is welded as 146kJ/cm, FAB is welded as 180kJ/cm, CO 2Be welded as 1.5kJ/cm.Groove all is double V-groove.At this, the composition control of the Cu in the welding metal of each welding joint, Mo and W is following to carry out: make the target that has Cu, Mo and W and form according to mother metal thinning ratio (CO 2Welding about 11%, FAB welding about 47%, FCB welding about 67%) conversion and the welding wire of the composition of trying to achieve uses it to weld.Should illustrate, use solder flux (PF-I55E/ Kobe Steel Ltd. system) and liner solder flux (PF-I50R/ Kobe Steel Ltd. system) in the FCB welding, use solder flux (PF-I52E/ Kobe Steel Ltd. system), weighting agent (RR-2/ Kobe Steel Ltd. system) and liner material (FA-B1/ Kobe Steel Ltd. system) in the FAB welding.
Should illustrate that the FCB welding refers to scatter the liner solder flux at copper coin as mentioned above, by being pressed in the steel plate back side, form the method for root run by the single track welding.In addition, the FAB welding refers to that the liner material that will be made of cellotape, solid flux etc. directly is layered on the steel plate back side, forms the method for root run by the single track welding.
To the above-mentioned welding joint that as above prepares, Cu, the Mo in use atomic absorption analysis method (atomic absorption spectrometry) the mensuration welding metal and the content of W.
And then, according to following main points, simulated whole corrosion test at the upperdeck back side and simulated the local anti-corrosion test of oil carrier base plate environment.
(1) simulated whole corrosion test of oil carrier upperdeck environment
In order to estimate the erosion resistance for whole corrosion in the oil carrier upperdeck back side, position from the thickness of slab 1/4 of the Plate Steel welding joint of above-mentioned No.1～36, so that the width of welding metal and test film walks abreast and is positioned at central mode, cut out the rectangle small pieces of width 25mm * length 60mm * thickness 5mm, with the sand paper (emery paper) of 600 granularities its surface is ground.With the rubber belt sealing back side and end face, it is not corroded, use corrosion testing apparatus shown in Figure 1 to carry out whole corrosion test.
This corrosion testing apparatus is made of corrosion test groove (corrosion test bath) 2 and temperature control panel 3, and implantation temperature is maintained at 36 ℃ water 6 in corrosion test groove 2, in addition, imports the CO by 12vol% in its water 6 2, 5vol% O 2, 0.01vol% SO 2, 0.3vol% H 2The N of S, surplus 2The mixed gas that consists of (importing gas 4), (supersaturated water vapor) is full of in the corrosion test groove 2 with oversaturated water vapour, reproduces the corrosive environment at the petroleum tank upperdeck back side.And, to being installed in the corrosion test sheet 1 at the back side on this Thoughs, Jie is by the temperature control panel (temperature-controlled plate) 3 that is built-in with well heater (electric heater) and refrigerating unit (cooling system), the temperature variation that 25 ℃ * 3 hours+50 ℃ * 21 hours was 1 cycle was given 180 days repeatedly, make dew result from the surface of test film 1, whole corrosion produced.Shown in Fig. 15 is the Exhaust Gas from Thoughs.
After the above-mentioned test, remove the rust on each test film surface, obtained because the quality due to the corrosion reduces by the quality change before and after the test, be converted into thickness of slab decrement (corrosion speed of single face) in 1 year by this value.Consequently, be below the 0.08mm/ with corrosion speed and confirm that it is anti-whole corrodibility good (zero) that either party in mother metal section and weld part does not all have the average evaluation of local corrosion that will the average evaluation of local corrosion be arranged above 0.08mm/ or the either party's Visual Confirmation in mother metal section, weld part is anti-whole corrodibility poor (*).
(2) local corrosion (spot corrosion) of having simulated oil carrier oil groove section base plate environment is tested
In order to estimate the erosion resistance for the spot corrosion in the oil carrier oil groove section base plate, position from the thickness of slab 1/4 of the Plate Steel welding joint of above-mentioned No.1～36, so that the width of welding metal and test film walks abreast and is positioned at central mode, cut out the rectangle small pieces of width 25mm * length 60mm * thickness 5mm, with the sand paper (emery paper) of 600 granularities its whole face is ground.
Then, preparation is modulated into the testing liquid that Cl ionic concn 10 quality %, pH0.85 form with the 10 quality %NaCl aqueous solution with concentrated hydrochloric acid (concentrated hydrochloric acid), pass line (thread) in the hole of the 3mm on test film top φ and it is hung opening, each test film all carries out 168 hours corrosion test of dipping in the testing liquid of 2L.Should illustrate, 30 ℃ are heated, remained on to testing liquid in advance, per testing liquid that more renewed in 24 hours.
The device that uses in the above-mentioned corrosion test is shown in Fig. 2.This corrosion testing apparatus is the doublet type device of corrosion test groove 8, thermostatic bath (constant-temperature bath) 9, adds above-mentioned testing liquid 10 in corrosion test groove 8, and test film 7 usefulness lines (thread) 11 are hung and impregnated in wherein.The temperature of testing liquid 10 is to keep by the temperature that adjustment joins the water 12 of thermostatic bath (constant-temperature bath) 9.
After the above-mentioned corrosion test, remove the rust that is created on the test film surface after, obtain of poor quality before and after the test, it is poor according to whole surface-area conversion, obtain the thickness of slab reduction (corrosion speed on two sides) in 1 year.Consequently, be below the 0.8mm/ with corrosion speed and not have the average evaluation of local corrosion at mother metal section and weld part Visual Confirmation be anti-local corrosion good (zero), corrosion speed is surpassed 0.8mm/ and below the 1.0mm/ and in mother metal section and weld part Visual Confirmation the average evaluation of local corrosion is arranged is anti-local corrosion poor (*).
The result of the result of above-mentioned magnetic-particle test (magnetic-particle testing) and corrosion resistance test is shown among table 2-1, the table 2-2 in the lump with become to be grouped into X value and the Z value of trying to achieve by each steel plate.By these tables as can be known, mother metal satisfies the No.1 that becomes to be grouped into and satisfy the condition of X value and Z value of the present invention～Plate Steel of 4,6,7 and 10～29 with welding metal does not have the generation of crackle when rolling, and any that simulated in the corrosion resistance test of the corrosion resistance test at the upperdeck back side and simulated oil bottomplate environment all demonstrates good erosion resistance, relative therewith, the No.5,8 of discontented foot condition of the present invention, 9 and 30～36 Plate Steel all do not obtain good erosion resistance in any corrosion resistance test.In addition, Fig. 3 is that expression is about the Plate Steel of No.1～36, the figure of the impact (base plate and upper plate) that weld metal composition causes the erosion resistance of oil carrier corrosion-resistant steel welding joint, transverse axis is made as (Cu in the welding metal)/{ Cu in the welding metal }, the longitudinal axis is made as { Cu in the welding metal }/{ (Mo+W) in the mother metal }, marks and draws.
As shown in Figure 3, (Cu in the welding metal)/{ Cu in the welding metal } is that 3～7 scope and { Cu in the welding metal }/{ (Mo+W) in the mother metal } satisfy in the situation of 1～10 scope, simulated the corrosion resistance test at the upperdeck back side and simulated in the corrosion resistance test of oil carrier base plate environment any all to show good erosion resistance (zero mark and the △ mark of table 2-1 and table 2-2) (among Fig. 3 ◆ mark).Should illustrate, the ■ among Fig. 3 represented to simulate the corrosion resistance test at the upperdeck back side and simulated in the corrosion resistance test of oil carrier base plate environment any be *.
Nomenclature
1,7: test film
2,8: the corrosion test groove
3: temperature control panel
4: import gas
5: Exhaust Gas
6,12: water
9: thermostatic bath
10: experimental liquid
11: line
Table 1-1
Table 1-2
Figure BDA00002410526500201
Table 2-1
Figure BDA00002410526500211
Table 2-2
Figure BDA00002410526500221

Claims (6)

1. welding joint is steel to be welded to one another and the welding joint of the petroleum tank that forms, and described steel contain:
C:0.03～0.16 quality %,
Si:0.05～1.50 quality %,
Mn:0.1～2.0 quality %,
Below the P:0.025 quality %,
Below the S:0.010 quality %,
Al:0.005～0.10 quality %,
Below the N:0.008 quality %,
Cr: surpass 0.1 quality % and be below the 0.5 quality %,
Cu:0.03～0.4 quality %,
And, contain be selected from W:0.01～1.0 quality %, Mo:0.01～0.5 quality %, Sn:0.001～0.2 quality %, and Sb:0.001～0.4 quality % in one kind or two or more,
And then, containing described composition by the X value of following (1) formula definition as the Z value that defines below 0.5, by following (2) formula as the mode below 0.15,
Surplus is made of Fe and inevitable impurity;
Contained Cu, Mo and W satisfies following (3) formula and (4) formula in the mother metal and in the welding metal of welding joint;
X value=(1-0.8 * Cu 0.5) * { 1-(0.8 * W+0.4 * Mo) 0.3} * { 1-(Sn+0.4 * Sb) 0.3} * { 1-(0.05 * Cr+0.03 * Ni+0.03 * Co) 0.3} * { 1+2 * (S/0.01+P/0.025) } ... (1)
The Z value=(1+10 * Sn) * (Cu-0.7 * Ni) ... (2)
3＜{ Cu in the welding metal }/{ Cu in the mother metal }≤7 ... (3)
1≤(Cu in the welding metal)/{ (Mo+W) in the welding metal }≤10 ... (4)
Wherein, the symbol of element in the above-mentioned formula represents the content (quality %) of each element.
2. welding joint according to claim 1, wherein, described steel further contain a kind or 2 kinds that is selected among Ni:0.005～0.4 quality % and the Co:0.01～0.4 quality % on the basis that described one-tenth is grouped into.
3. welding joint according to claim 1 and 2, wherein, described steel on the basis that described one-tenth is grouped into, further contain be selected from Nb:0.001～0.1 quality %, Ti:0.001～0.1 quality %, Zr:0.001～0.1 quality %, and V:0.002～0.2 quality % in one kind or two or more.
4. each described welding joint according to claim 1～3, wherein, described steel on the basis that described one-tenth is grouped into, further contain be selected from Ca:0.0002～0.01 quality %, REM:0.0002～0.015 quality %, and Y:0.0001～0.1 quality % in one kind or two or more.
5. each described welding joint according to claim 1～4, wherein, described steel further contain B:0.0002～0.003 quality % on the basis that described one-tenth is grouped into.
6. a petroleum tank has each described welding joint in the claim 1～5.
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CN111386357A (en) * 2017-11-24 2020-07-07 杰富意钢铁株式会社 Corrosion-resistant steel for deck and bottom plate of crude oil tanker and crude oil tanker
CN113549819A (en) * 2021-06-29 2021-10-26 鞍钢股份有限公司 High-performance steel plate for resisting corrosion in ocean splash zone and production method thereof
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