CN103692107A - Anti-corrosion submerged-arc welding wire for tanker construction - Google Patents

Anti-corrosion submerged-arc welding wire for tanker construction Download PDF

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Publication number
CN103692107A
CN103692107A CN201310745307.XA CN201310745307A CN103692107A CN 103692107 A CN103692107 A CN 103692107A CN 201310745307 A CN201310745307 A CN 201310745307A CN 103692107 A CN103692107 A CN 103692107A
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China
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submerged
corrosion
welding wire
arc welding
welding
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CN201310745307.XA
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Inventor
马成勇
肖红军
彭云
田志凌
魏金山
张晓牧
何长红
杨柏
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Central Iron and Steel Research Institute
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Central Iron and Steel Research Institute
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • B23K35/3073Fe as the principal constituent with Mn as next major constituent

Abstract

The invention discloses an anti-corrosion submerged-arc welding wire for tanker construction. The chemical components of the submerged-arc welding wire include C (carbon), Si (silicon), Mn (manganese), P (phosphorus), S (sulphur), Ni (nickel), Cu (copper), Ti (titanium), Al (aluminum), at least one of Mo (molybdenum) and W (tungsten) and the balance iron, wherein the mass percent of the chemical components satisfies the conditions that 0.03%<=C<=0.15%, 0.01%<=Si<=0.5%, 1%<=Mn<=2.5%, 0<P<=0.015%, 0<S<=0.02%, 0.1%<=Ni<=1%, 0.01%<=Cu<=1%, 0.01%<=Ti<=0.25%, 0<Al<=0.1%, 0.01%<=Mo<=0.5%, 0.01%<=W<=0.5% and (Cu+2Ti+4Mo+4W)/2S>=40. Compared with the prior art, the submerged-arc welding wire has the advantages that the submerged-arc welding wire is reasonable in composition design, welded seams has good uniform corrosion resisting and local corrosion resisting performance in crude oil corrosion environments after welding, and service life of the welded seams in a naked state is effectively prolonged.

Description

A kind of for building the anti-corrosion welding wire for submerged-arc welding of oil tanker
Technical field
The present invention relates to a kind of welding wire for submerged-arc welding, particularly a kind of for building the anti-corrosion welding wire for submerged-arc welding of oil tanker.
Background technology
Oil carrier oil cargo tank when crude oil is housed, in oil cargo tank in extremely complicated and severe corrosive environment.First, the upper deck generation homogeneous corrosion in oil cargo tank.In the transportation of crude oil, in oil cargo tank, be filled with anti-explosion gas (5%O 2+ 13%CO 2+ 0.01%SO 2+ 0.1%H 2s+bal N 2), under day alternates with night, temperature and humidity change in oil carrier oil cargo tank, the upper deck water droplet that can freeze-out.Owing to there is sour gas in oil cargo tank, cause in water droplet pH value lower, this sour water corrodes deck and forms iron rust, and the iron rust of formation can promote H in gas phase as catalyst 2the oxidation of S, thus solid sulfur on upper deck, generated.Solid sulfur and iron rust alternately generate, and because solid S is very crisp, this corrosion product is easy to peel off from upper deck, is stacked into the lower shoe of oil cargo tank.Data shows, take solid S as main corrosion product is up to more than 300 tons in oilburg.Therefore, the key of controlling solid S generation is to reduce the generation of catalyst, reduces iron rust.
On the other hand, in the lower shoe generation spot corrosion of oil cargo tank, this is ubiquitous phenomenon in actual oil carrier.Find after deliberation, the salt solution containing in crude oil corrodes lower shoe, forms as " bowl-shape " etch pit, and along with the pH carrying out in etch pit of corrosion declines, can reach 0.8 left and right, and then accelerate the expansion of etch pit.In addition the solid S peeling off from deck, also plays the effect of acceleration to spot corrosion.Therefore, for improving lower shoe pitting resistance, be the pitting resistance that improves steel on the one hand, be to reduce the corrosion product that contains solid sulfur on the other hand.The part that weld seam forms as oil cargo tank is faced with these etching problems equally.
Current, the construction of oil carrier oil cargo tank adopts common hull steel and general welding material, and the own corrosion resisting property of steel and wlding is poor.And address these problems effective method exactly to carry out coating antiseptic processing in oil cargo tank comprehensively, but because coated area is huge, and just need to again apply every 10 years, a large amount of man power and materials spent.Therefore, carried out the research without coating oil shipload cargo tank corrosion-resisting steel both at home and abroad, as US2010000361, CN1946864, JP2003-82435, CN101389782, CN100562598 etc.And existing anti-corrosion wlding technical thought is by restriction S content (percentage by weight is less than 0.01%), add a certain amount of corrosion resistant alloy element (Ni, Cu etc.) to improve anti-corrosion element, for example CN102744529 and CN102672314 simultaneously.Because this Technology Need strictly limits S content (S≤0.01), this has strengthened welding wire steel smelting, production difficulty, has increased cost simultaneously.In addition, because welding wire for submerged-arc welding must be combined use with solder flux, and solder flux is comprised of several mineral materials, and the very difficult control of S content often causes the local S content of weld metal high, and this brings great risk to the corrosion resistance of weld seam.
Summary of the invention
The object of the present invention is to provide a kind of anti-corrosion welding wire for submerged-arc welding for tanker construction, the new type of submerged arc silk of developing especially for Special Corrosion environment in oil carrier oil cargo tank.
Anti-corrosion technical thought of the present invention is in welding wire for submerged-arc welding, to add a certain amount of Cu, Ti, W, Mo element, these elements and S form and are insoluble to sour sulfide, avoided the generation of aggressivity sulphion, improve weld seam corrosion resistance, add a certain amount of Ni simultaneously and regulate corrosion potential, avoid and mother metal generation galvanic corrosion.
The object of the invention is to be achieved through the following technical solutions:
For building an anti-corrosion welding wire for submerged-arc welding for oil tanker, the chemical composition of described welding wire for submerged-arc welding by mass percent is: 0.03≤C≤0.15%; 0.01≤Si≤0.5%; 1≤Mn≤2.5%; 0 < P≤0.015%; 0 < S≤0.02%; 0.1≤Ni≤1%; 0.01%≤Cu≤1%; 0.01≤Ti≤0.25%; 0<Al≤0.1%; At least one in Mo and W, its content is respectively 0.01-0.5%; Surplus is iron; Meet (Cu+2Ti+4Mo+4W)/2S >=40 simultaneously.
The chemical composition of described welding wire for submerged-arc welding by mass percent is: 0.04≤C≤0.1%; 0.16≤Si≤0.21%; 1.58≤Mn≤2.07%; P≤0.01%; S≤0.019%; 0.29≤Ni≤0.45%; 0.2%≤Cu≤0.51%; 0.09≤Ti≤0.12%; Al≤0.01%; At least one in Mo and W, its content is respectively 0.05-0.2%; Surplus is iron; Meet 51≤(Cu+2Ti+4Mo+4W)/2S≤138 simultaneously.
Described for building the purposes of the anti-corrosion welding wire for submerged-arc welding of oil tanker: after adopting this welding wire for submerged-arc welding welding, weld seam is without preservative treatment.
Beneficial effect of the present invention is:
Compared with prior art, the present invention has relaxed 1 times to welding wire for submerged-arc welding S content limited field, greatly reduces and smelts production difficulty, has effectively improved the stability of weld seam corrosion resisting property simultaneously, has reduced welding wire for submerged-arc welding cost simultaneously.The weld seam that utilizes this welding wire for submerged-arc welding to weld to obtain is without through preservative treatment, even if also have good resistance to homogeneous corrosion and resistance to local corrosion performance under the corrosive environment of crude oil, weld seam also has good mechanical property simultaneously.
The specific embodiment
Below in conjunction with embodiment, the present invention is described in detail.
The chemical composition of welding wire for submerged-arc welding (mass percent) is: 0.03≤C≤0.15%; 0.01≤Si≤0.5%; 1≤Mn≤2.5%; 0 < P≤0.015%; 0 < S≤0.02%; 0.1≤Ni≤1%; 0.01%≤Cu≤1%; 0.01≤Ti≤0.25%; 0<Al≤0.1%; At least one in Mo and W, its content is respectively 0.01-0.5%; Surplus is iron; (Cu+2Ti+4Mo+4W)/2S >=40 simultaneously.
According to the embodiment of the present invention for building the welding wire for submerged-arc welding of oil carrier oil cargo tank, C is solution strengthening element, can effectively improve weld strength.In order to reach needed intensity, carbon content should be greater than 0.03%, but can cause during C too high levels bead crack tendency to increase, thus toughness drop, so C content is no more than 0.15%.
Si can improve the intensity of weld metal, and under sour environment, Si can improve the corrosion resistance of weld seam simultaneously.On the other hand, can reduce the toughness of weld seam during Si too high levels.Consider that flux can be to a certain amount of Si of weld seam transition, therefore, in welding wire for submerged-arc welding, Si content is: 0.01-0.5% simultaneously.
Mn is one of main intensified element in this welding wire for submerged-arc welding composition, is again deoxidant element simultaneously, so Mn content should be more than or equal to 1%, Mn content can reduce over the toughness of 2.5% rear weld metal simultaneously.Therefore in welding wire for submerged-arc welding, Mn content is 1-2.5%.
P, S are impurity elements, can reduce the toughness of weld seam, and content is more low better in principle, but P, S are too low, can increase manufacturing cost.Therefore, P and S should meet respectively: 0 < P≤0.015%, 0 < S≤0.02%.
Ni is the element that effectively improves welding seam toughness, is also to improve one of corrosion proof alloying element of weld seam.Ni can form sulfide and improve rusty scale under wetting hydrogen-sulfide environmental, thereby improves corrosion resistance.After its content surpasses 0.1%, the effect that improves toughness and corrosion resistance can obviously show.But Ni can increase cost, its content should be lower than 1%.Therefore Ni content is 0.1-1%
Cu is main one of corrosion proof alloying element of weld seam that improves in this welding wire for submerged-arc welding.Cu improves the weld seam opposing homogeneous corrosion that acid water causes under dry wet environment repeatedly, and in the situation that there is hydrogen sulfide, by forming the sulfide (Cu of slightly solubility 2s) improve rusty scale and improve resistance to homogeneous corrosion and pitting corrosion resistance, and then also can in the situation that there is solid S, produce by inhibiting point corrosion.In addition, can also suppress solid S generates.In order to give full play to its corrosion resistance, Cu content should be greater than 0.1%.But Cu too high levels can improve the sensitiveness that produces fire check, and therefore, Cu content should be less than 1%.Therefore, Cu content should be 0.1-1%.
Ti is the element of effective deoxidation, and simultaneously Ti and S can form TiS and suppress easily to become the generation of the MnS of corrosion starting point, thereby improve the resistance to homogeneous corrosion of weld seam and pitting corrosion resistance.But Ti too high levels can reduce the low-temperature flexibility of weld seam.Therefore, welding wire for submerged-arc welding Ti content of the present invention is 0.01-0.25%.
Al is deoxidant element, also have simultaneously and suppress the effect that solid sulfur generates, but Al too high levels can reduce weld seam low-temperature flexibility, and therefore, Al content should be less than 0.1%.
For building the chemical composition (mass fraction) of the welding wire for submerged-arc welding of oil carrier oil cargo tank, also contain at least one in Mo and W, its content is respectively 0.01-0.5%.
Specifically, Mo is substantially similar with W effect, and Mo, W and S form the sulfide (MoS that is insoluble in sour water on the one hand 2and WS 2), avoid the generation of aggressivity sulphion, and then improved corrosion resistance.The erosion of chlorion to matrix be can stop on the other hand, thereby resistance to homogeneous corrosion and the pitting corrosion resistance of weld seam improved.In order to bring into play its effect, in welding wire for submerged-arc welding composition, the content of Mo or W should be greater than 0.01%.But the content of Mo or W is crossed conference and caused toughness drop, so the content of Mo or W should not be greater than 0.5%.Therefore, Mo and/or W content in welding wire for submerged-arc welding is respectively 0.01-0.5%.
Cu, Ti, Mo and W can form the sulfide that is insoluble in sour water with S.For fear of the formation of aggressivity S sulphion, improve weld seam corrosion resistance, require (Cu+2Ti+4Mo+4W)/2S >=40.
In order to describe in detail according to the performance of the welding wire for submerged-arc welding of the embodiment of the present invention, according to the oil carrier oil cargo tank of above-mentioned design, with the composition of welding wire for submerged-arc welding, process, prepared altogether 7 according to the welding wire for submerged-arc welding of the embodiment of the present invention and 2 comparative examples (in Table 1).
The chemical composition of table 1 welding wire for submerged-arc welding (mass percent, %)
Figure BDA0000450240520000061
The preparation method of the embodiment of the present invention and comparative example is as follows:
(1) according to test requirements document, prepare burden (as table 1), adopt electric furnace to smelt;
(2) at 1050 ℃, be rolled, the drawing of welding wire for submerged-arc welding or copper facing are the processing method of prior art, and final acquisition is of a size of the copper facing of Φ 4.0mm or copper plating submerged arc welding wire not.
welding point test and Mechanics Performance Testing
Embodiment in the present invention and comparative example are carried out to welding point test, wherein solder flux is SJ101 solder flux, steel plate adopts oil carrier oil cargo tank corrosion resistant plate, the chemical composition of steel plate (mass percent) is: C0.09%, Si0.36%, Mn1.18%, also contain the impurity elements such as appropriate Ni, Cu and inevitable P, S, surplus is Fe.Joint mechanical property is as shown in table 2.
The basic mechanical performance of table 2 joint
? R P0.2/Mpa R m/Mpa A/% A K-20℃/J
Comparative example 1 485 570 26 170
Comparative example 2 475 580 27 186
Embodiment 1 490 585 26 194
Embodiment 2 500 595 26 162
Embodiment 3 470 565 27 208
Embodiment 4 520 605 27 181
Embodiment 5 460 570 26 173
Embodiment 6 510 605 27 178
Embodiment 7 470 585 26 226
Wherein, R p0.2(Mpa) represent Proof strength of non-proportional, R m(Mpa) represent tensile strength, A(%) represent elongation after fracture, A k-20 ℃(J) represent ballistic work.
According to embodiment of the present invention welding wire for submerged-arc welding and comparative example welding wire, possesses equally good basic mechanical performance as can be seen from Table 2.
In addition,, for the decay resistance of welding wire for submerged-arc welding is described, the corrosion test of simulated oil shipload cargo tank lower shoe and the corrosion test of simulated oil shipload cargo tank upper deck have also been carried out.The method that corrosion test proposes with reference to DE53 meeting of International Maritime Organization is carried out.
the corrosion test of simulated oil shipload cargo tank lower shoe
From the joint of above-mentioned welding point test, respectively intercept 5 parallel samples and carry out parallel test, length is 60mm, and width is 25mm, and thickness is 5mm.First specimen surface polishes with grinding machine, then with No. 600 sand paper, polishes again.Corrosive liquid is the 10%NaCl aqueous solution, pH=0.85, and temperature is 30 ℃, sample dip time is 168 hours.Finally measure the maximum corrosion depth of mother metal, heat affected area and weld seam, and amount to adult corrosion rate (mm/).Oil carrier oil cargo tank lower shoe joint Corrosion results is as shown in table 3.
Wherein, the corrosion rate of comparative example welding wire weld seam is apparently higher than the corrosion rate of steel plate, and weld seam does not mate with mother metal.Adopt embodiment of the present invention welding wire for submerged-arc welding to weld, mother metal is suitable with weld corrosion speed, and coupling rationally.In addition, adopt comparative example wire welding seam surface to produce larger-size point corrosion pit, the degree of depth is up to 2.1mm measurement point face of weld pit.And adopt embodiment of the present invention wire welding seam surface not find point corrosion pit.
the corrosion test of simulated oil shipload cargo tank upper deck
From the joint of above-mentioned welding point test, respectively intercept 5 parallel samples and carry out parallel test, specimen length is 60mm, and width is 25mm, and thickness is 5mm.First specimen surface polishes with grinding machine, then with No. 600 sand paper, polishes again.Analog gas composition is 4%O 2, 13%CO 2, 0.01%SO 2, 0.05%H 2s, bal N 2.Beginning gas flow is 100mL/min, and after 24 hours, gas flow is 20mL/min.Sample is periodically heated, and within 24 hours, is a cycle.Sample maintains 20 hours when temperature 50 C in one-period, when 25 ℃ of temperature, keeps 3 hours, and the adjusting time of two temperatures is 1 hour.In addition, when specimen temperature is 50 ℃, distilled water temperature is no more than 36 ℃.Test is carried out 98 days altogether.Oil carrier oil cargo tank upper deck joint Corrosion results is as shown in table 3.
As can be seen from Table 3, comparative example sample adopts traditional welding wire for submerged-arc welding to weld, and the corrosion rate of weld seam is apparently higher than the corrosion rate of steel plate.According to the 3M-9M sample of the embodiment of the present invention, adopt welding wire for submerged-arc welding of the present invention to weld, mother metal is suitable with weld corrosion speed, and coupling rationally.
Table 3 joint Corrosion results
Figure BDA0000450240520000081
Hence one can see that, and according to the welding wire for submerged-arc welding of the embodiment of the present invention compared with prior art, Composition Design is reasonable, and after welding, weld seam just has good resistance to homogeneous corrosion and pitting resistance without preservative treatment, improved the corrosion resistance of oil carrier integral body.In addition, weld seam has good mechanical property.

Claims (3)

1. for building an anti-corrosion welding wire for submerged-arc welding for oil tanker, it is characterized in that, the chemical composition of described welding wire for submerged-arc welding by mass percent is: 0.03≤C≤0.15%; 0.01≤Si≤0.5%; 1≤Mn≤2.5%; 0 < P≤0.015%; 0 < S≤0.02%; 0.1≤Ni≤1%; 0.01%≤Cu≤1%; 0.01≤Ti≤0.25%; 0<Al≤0.1%; At least one in Mo and W, its content is respectively 0.01-0.5%; Surplus is iron; Meet (Cu+2Ti+4Mo+4W)/2S >=40 simultaneously.
2. welding wire for submerged-arc welding as claimed in claim 1, is characterized in that, the chemical composition of described welding wire for submerged-arc welding by mass percent is: 0.04≤C≤0.1%; 0.16≤Si≤0.21%; 1.58≤Mn≤2.07%; P≤0.01%; S≤0.019%; 0.29≤Ni≤0.45%; 0.2%≤Cu≤0.51%; 0.09≤Ti≤0.12%; Al≤0.01%; At least one in Mo and W, its content is respectively 0.05-0.2%; Surplus is iron; Meet 51≤(Cu+2Ti+4Mo+4W)/2S≤138 simultaneously.
3. as claimed in claim 1 for building the purposes of the anti-corrosion welding wire for submerged-arc welding of oil tanker: it is characterized in that, adopt this welding wire for submerged-arc welding welding after weld seam without preservative treatment.
CN201310745307.XA 2013-12-30 2013-12-30 Anti-corrosion submerged-arc welding wire for tanker construction Pending CN103692107A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104476008A (en) * 2014-12-03 2015-04-01 钢铁研究总院 Welding wire for high-heat-input submerged-arc welding
CN105458549A (en) * 2015-12-18 2016-04-06 钢铁研究总院 Submerged arc welding wire for reactor supporting structure steel

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CN1843683A (en) * 2005-04-07 2006-10-11 株式会社神户制钢所 Solid-core welding wire for gas shielded welding
US20070269335A1 (en) * 2001-11-19 2007-11-22 Nippon Steel Corporation Low alloy steel and weld joint thereof excellent in corrosion resistance to hydrochloric acid and sulfuric acid
CN101288924A (en) * 2007-04-20 2008-10-22 宝山钢铁股份有限公司 Seawater corrosion resistance submerged arc welding wire rod, welding wire and application thereof
CN102601543A (en) * 2012-04-09 2012-07-25 天津大桥焊丝有限公司 Low-carbon submerged arc welding wire
CN102699566A (en) * 2012-06-12 2012-10-03 钢铁研究总院 Flux-cored wire for cargo oil tank of oil tanker
CN102744529A (en) * 2012-06-29 2012-10-24 宝山钢铁股份有限公司 Submerged arc welding wire suitable for welding cargo oil tank of crude oil tanker
CN102773594A (en) * 2012-08-20 2012-11-14 南京钢铁股份有限公司 Submerged-arc welding method of corrosion-resistant steel for cargo oil tank of crude oil carrier

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070269335A1 (en) * 2001-11-19 2007-11-22 Nippon Steel Corporation Low alloy steel and weld joint thereof excellent in corrosion resistance to hydrochloric acid and sulfuric acid
CN1843683A (en) * 2005-04-07 2006-10-11 株式会社神户制钢所 Solid-core welding wire for gas shielded welding
CN101288924A (en) * 2007-04-20 2008-10-22 宝山钢铁股份有限公司 Seawater corrosion resistance submerged arc welding wire rod, welding wire and application thereof
CN102601543A (en) * 2012-04-09 2012-07-25 天津大桥焊丝有限公司 Low-carbon submerged arc welding wire
CN102699566A (en) * 2012-06-12 2012-10-03 钢铁研究总院 Flux-cored wire for cargo oil tank of oil tanker
CN102744529A (en) * 2012-06-29 2012-10-24 宝山钢铁股份有限公司 Submerged arc welding wire suitable for welding cargo oil tank of crude oil tanker
CN102773594A (en) * 2012-08-20 2012-11-14 南京钢铁股份有限公司 Submerged-arc welding method of corrosion-resistant steel for cargo oil tank of crude oil carrier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104476008A (en) * 2014-12-03 2015-04-01 钢铁研究总院 Welding wire for high-heat-input submerged-arc welding
CN105458549A (en) * 2015-12-18 2016-04-06 钢铁研究总院 Submerged arc welding wire for reactor supporting structure steel

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Application publication date: 20140402