CN110170765A - The mating acidic electrode of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel and preparation method - Google Patents

The mating acidic electrode of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel and preparation method Download PDF

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Publication number
CN110170765A
CN110170765A CN201910441251.6A CN201910441251A CN110170765A CN 110170765 A CN110170765 A CN 110170765A CN 201910441251 A CN201910441251 A CN 201910441251A CN 110170765 A CN110170765 A CN 110170765A
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weight
parts
storage tank
lng storage
high manganese
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CN110170765B (en
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白昶
刘奇望
蒋勇
明廷泽
张克静
王若蒙
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SICHUAN ATLANTIC CHINA WELDING CONSUMABLES Inc
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SICHUAN ATLANTIC CHINA WELDING CONSUMABLES Inc
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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
    • 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
    • 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
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • 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
    • B23K35/40—Making wire or rods for soldering or welding

Abstract

The invention discloses a kind of mating acidic electrodes of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel, it is made of core wire and the coating wrapped in core wire surface, coating composition and content are as follows: marble 6.0-10.0 parts by weight, fluorite 5.0-9.0 parts by weight, rutile 7.0-11.0 parts by weight, metal nickel powder 0.5-1.0 parts by weight, crome metal 0.6-1.8 parts by weight, molybdenum-iron 0.2-0.8 parts by weight, electrolytic manganese 4.0-6.0 parts by weight, feldspar 2.0-4.0 parts by weight, ferrotianium 0.8-1.6 parts by weight, silicon powder 1.0-2.2 parts by weight, sodium alginate 0.4-0.6 parts by weight.Compared with the existing, welding rod welding deposited metal intensity -196 DEG C of impact functions in the case where being greater than 660MPa of the present invention reach 60J or more.

Description

The mating acidic electrode of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel and preparation method
Technical field
The technical field for being related to belonging to welding material preparation is more particularly related to a kind of high manganese Ovshinsky of LNG storage tank peculiar to vessel The mating acidic electrode of body ultralow temperature steel, the preparation method of the mating acidic electrode of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel, ship With the welding method of the high Manganese Austenitic Cryogenic Steels of LNG storage tank and the plumb joint of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel.
Background technique
In the face of the increasingly serious ecological environment pollution situation, in order to optimize energy consumption structure, improve atmospheric environment, in fact The Strategy for economic development of existing sustainable development, people have selected this cleaning of natural gas, efficient environmental high-grade energy and combustion Material.Now, either industrial or civilian, increasing dependence is all produced to natural gas.Environmentally friendly advanced state in the world Family all promote the use of LNG be used as power plant, factory, domestic consumer fuel.
LNG usually stores transport under the conditions of -163 DEG C, mainly uses 9%Ni steel, Ni36 invar alloy, Ovshinsky at this stage The main material as LNG storage tank such as body stainless steel, 5XXX line aluminium alloy.These materials there are at high cost, design strength is lower, The disadvantages of welding processing is poor, such as the usage amount of Ni precious metal is higher that (the Ni content of 9%Ni steel is about 9%, the Ni of wlding 50%) content is higher than, steel plate and wlding cost are difficult to decrease, thus receive restriction in application aspect.
Used at ultra-low temperature potassium steel is added used in the Mn substitution Conventional cryogenic steel of 22% or more mass fraction in steel Nickel, Mn and C rational proportion can realize good obdurability combination using being made after solution treatment appropriate at low temperature.It is super Low temperature potassium steel is stablized under LNG storage temperature, and cost can be greatly reduced, standby as second generation LNG storage tank new material It attracts attention.Exploitation is suitable for the mating wlding of used at ultra-low temperature potassium steel, can effectively reduce total construction cost of LNG project.
CN109623194A discloses a kind of hydrogen controlled electrode for the welding of ultralow temperature potassium steel manual arc, welding rod core Chemical constituent be: C:0.30-0.75wt%, Mn:20-26wt%, Ni:6.5-8.5wt%, Cr:3.0-5.5wt%, W: 2.5-4.0wt%, P≤0.002wt%, S≤0.001wt%, surplus are Fe and inevitable impurity；The chemical group of its coating Dividing is: marble is 35~40wt%, 16~22wt% of fluorite, 3~5wt% of quartz sand, 3~6wt% of zircon sand, rutile 4 ~10wt%, 5~10wt% of ferrotianium, 5~8wt% of low-carbon ferromanganese, 3~6wt% of ferrosilicon, rare earth 1~2wt% of ferrosilicon synthesize cloud Binder is added in mother 2~3wt%, 1~2wt% of soda ash, weight percentage of each component and be 100%, according to a conventional method mixing, Wrap on core wire, through low high temperature bake.But the welding rod is when welding the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel, It has been investigated that having the following deficiencies:
1. the C content in core wire chemical constituent is higher, C content is higher in potassium steel, and work-hardening capacity is bigger, this is unfavorable It is manufactured in drawing, chopping of core wire etc..And excessively high C is transitioned into welding point, considerably increases grain boundary carbide precipitation Tendency, influences welding joint mechanical property.
2. the W of Ni, 2.5-4.0wt% of core wire 6.5-8.5wt% causes core wire cost and welding rod product cost larger.
Summary of the invention
An object of the present invention, which is that, provides a kind of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel mating acid weldering Item, the welding rod weld deposited metal intensity -196 DEG C of impact functions in the case where being greater than 660MPa and reach 60J or more.
Technical solution is: a kind of mating acidic electrode of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel and preparation method, by Core wire and the coating wrapped in core wire surface form, coating composition and content are as follows: marble 6.0-10.0 parts by weight, fluorite 5.0-9.0 parts by weight, rutile 7.0-11.0 parts by weight, metal nickel powder 0.5-1.0 parts by weight, crome metal 0.6-1.8 parts by weight, Molybdenum-iron 0.2-0.8 parts by weight, electrolytic manganese 4.0-6.0 parts by weight, feldspar 2.0-4.0 parts by weight, ferrotianium 0.8-1.6 parts by weight, silicon Micro mist 1.0-2.2 parts by weight, sodium alginate 0.4-0.6 parts by weight.
Preferably, the coating weight is the 30-45% of high manganese core wire weight.
Preferably, CaCO in the marble3Content >=96%, CaF in fluorite2Content >=96%, TiO in rutile2 >=95.5%, Ni >=99.5% in metal nickel powder, Cr >=98.0% in crome metal, Mo55-60% in molybdenum-iron, Mn in electrolytic manganese >= 99.0%, SiO in feldspar2>=60.0%, Al2O3>=16.0%, Ti25.0-35.0% in ferrotianium, SiO in silicon powder2≥ 98.0%, Na in sodium alginate2O9.0-13.0%, ash content 20.0-30.0%.
Preferably, the core wire ingredient are as follows: C≤0.25wt%, Mn26.50-29.00wt%, Si≤1.00wt%, Cr ≤ 5.00wt%, Ni≤5.0wt%, S≤0.010t% and P≤0.015wt%, surplus are Fe and inevitable impurity.
Preferably, the core wire ingredient be C0.24%, Mn27.1%, Si0.65%, Cr3.20%, Ni1.48%, S0.0026% and P0.0076%, surplus are Fe and inevitable impurity.
Preferably, the marble is 10.0 parts by weight, fluorite is 7.0 parts by weight, rutile is 7.0 parts by weight, gold Category nickel powder is 0.8 parts by weight, crome metal is 1.8 parts by weight, molybdenum-iron is 0.8 parts by weight, electrolytic manganese is 4.0 parts by weight, feldspar is 4.0 parts by weight, ferrotianium are 1.2 parts by weight, silicon powder is 1.6 parts by weight, 0.6 parts by weight of sodium alginate；Or
The marble is 8.0 parts by weight, fluorite is 5.0 parts by weight, rutile is 11.0 parts by weight, metal nickel powder is 0.5 parts by weight, crome metal are 1.2 parts by weight, molybdenum-iron is 0.5 parts by weight, electrolytic manganese is 5.0 parts by weight, feldspar is 2.0 weight Part, ferrotianium are 1.6 parts by weight, silicon powder is 2.2 parts by weight, 0.6 parts by weight of sodium alginate；Or
The marble is 6.0 parts by weight, fluorite is 9.0 parts by weight, rutile is 9.0 parts by weight, metal nickel powder 1.0 Parts by weight, crome metal are 0.6 parts by weight, molybdenum-iron is 0.2 parts by weight, electrolytic manganese is 6.0 parts by weight, feldspar is 3.0 parts by weight, titanium Iron is 0.8 parts by weight, silicon powder is 1.0 parts by weight, 0.6 parts by weight of sodium alginate.
The second object of the present invention is to provide a kind of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel mating acidic electrode Preparation method.
Technical solution is: a kind of preparation method of the mating acidic electrode of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel, packet Include following steps:
1. above-mentioned powder is uniformly mixed；
2. the potassium-sodium water glass that concentration is 37 °~40 ° is added to be uniformly mixed；
It is wrapped on core wire 3. being sent into plodder, then bakes 4 hours, 350-380 DEG C of height through 80-120 DEG C of low temperature Temperature bakes 1.5 hours to get the mating acidic electrode of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel.
The third object of the present invention is to provide a kind of welding method of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel.
Technical solution is: a kind of welding method of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel, which uses It is ultralow that the mating acidic electrode of the above-mentioned high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel welds the high manganese austenite of LNG storage tank peculiar to vessel Wen Gang.
The fourth object of the present invention is to provide a kind of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel mating acidic electrode The plumb joint of welding.
Technical solution is: a kind of plumb joint of the mating acidic electrode welding of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel, The plumb joint deposited metal composition are as follows: C0.32-0.36%, Mn23.80-25.70%, Si0.48-0.69%, Cr4.32- 4.96%, Ni3.14-3.97%, Mo1.43-1.80%, S0.0002-0.0003% and P0.0072-0.0081%, surplus are Fe and inevitable impurity.
Preferably, the mechanical property under the deposited metal room temperature: tensile strength Rm=702-713Mpa, yield strength Rp0.2=447-496Mpa, elongation percentage A=45.0-48.0%, impact Akv (- 196 DEG C) average value 99-107J, weld seam middle part Hardness (HV10) average value 229-245.
Summary of the invention for ease of understanding, special main function and inventive principle explanation by each ingredient of coating raw material in the present invention It is as follows:
Marble: extremely common slag making, gas generating materials in welding rod manufacture can be improved the basicity of slag, refinement molten drop, steady Determine electric arc, increase slag and metal interface tension, improves de- slag, and have preferable desulphurizing ability.
Fluorite: can reduce the surface tension of liquid metal, improve the mobility of slag, reduce weld porosity sensibility, The physical property for improving slag plays a crucial role to appearance of weld, de- slag etc..
Rutile: main function is to stablize electric arc, slag making, can adjust fusing point, viscosity, surface tension and the flowing of slag Property, improve appearance of weld, reduce spatter.
Metal nickel powder: alloying constituent, to weld seam transition (infiltration) nickel element.Nickel is the conjunction of stable austenite in welding point Gold element, when Ni content has inhibition carbon precipitation from austenite, reduce grain boundary carbide in 3%-5% in welding point The effects of tendency is precipitated, substantially reduces intergranular carbide quantity.And Ni is also improved the cryogenic mechanics performance of potassium steel, improves The antioxygenic property and cracking resistance of potassium steel.
Crome metal: the intensity, yield point and corrosion resistance of weld metal can be improved to weld seam transition (infiltration) chromium Energy.
Molybdenum-iron: alloying constituent, using the form of ferroalloy, transition is stablized, and fluctuation is small, can effectively improve intensity.Molybdenum energy Effectively inhibit the precipitation of grain boundary carbide in potassium steel welding point cooling procedure.In potassium steel plus chromium then analyses grain boundary carbide Tendency improves out, and the compound addition of two kinds of molybdenum, chromium elements, can make the beneficial effect of two kinds of alloying elements while play in potassium steel Out.
Electrolytic manganese: addition can play the role of desulfurization, deoxidation, can also be to weld seam transition (infiltration) manganese element, raising weldering Stitch intensity.
Feldspar: it is slag making, stablizes electric arc, refinement molten drop in effect of the welding rod in, improve welding rod fusing speed.
Ferrotianium: making deoxidier and alloying constituent in welding rod, stablizes electric arc, can also be to weld seam transition titanium elements.In the present invention A small amount of titanium is added, can effectively refine crystal grain, improves crack resistance.
Silicon powder: making deoxidier in welding rod, and is conducive to stablize electric arc, refines molten drop, improves the physical property of slag. Silicon can aggravate the segregation of carbon, increase carbide on crystal boundary, deteriorate potassium steel toughness, therefore silicone content should not be too high.
Sodium alginate: being to improve medicinal powder viscosity in effect of the welding rod in, is conducive to eccentric steady during welding rod extrusion It is fixed.
The utility model has the advantages that
The core wire ingredient that the present invention uses is simple, and cost is relatively low；Coating composed structure is simple, deposited metal alloy system with Rationally, welding deposited metal composition analysis, stretches examination at ray detection to the high manganese austenite low-temperature steel matching of base material LNG storage tank It tests, be all satisfied the high manganese austenite low-temperature steel welding material particular/special requirement of LNG storage tank peculiar to vessel, weld deposited metal under as-welded, Tensile strength (Rm) under normal temperature condition, yield strength (Rp0.2), elongation percentage (A), (- 196 DEG C) ballistic work (Akv), weld seam it is hard Every good mechanical properties, the especially intensity such as degree -196 DEG C of impact functions in the case where being greater than 660MPa reach 60J or more. Arc stability when welding, coating are not easy rubescent cracking, splash small, and de- slag is good, and appearance of weld is beautiful, good operation performance.
Definition and explanation
The abbreviation of LNG- liquefied natural gas (liquefiednaturalgas).
Unless otherwise instructed, which is mass percent to %-.
Unless otherwise instructed, the article used in the present invention is commercial product.
Specific embodiment
The present invention is further illustrated combined with specific embodiments below.
Embodiment 1
Take high manganese core wire 100kg, core wire ingredient is (wt%): C:0.24%, Mn:25.10%, Si:0.65%, Cr:3.20%, Ni:1.48%, S:0.0026%, P:0.0076%, surplus are Fe and impurity.
Coating powder is taken, each Ingredients Weight is as follows in coating powder: containing CaCO398.60% marble is 10.0kg, is contained CaF296.90% fluorite is 7.0kg, contains TiO297.2% rutile is 7.0kg, and the metal nickel powder containing Ni99.6% is 0.8kg, the crome metal containing Cr98.5% are 1.8kg, and the molybdenum-iron containing Mo56.3% is 0.8kg, and the electrolytic manganese containing Mn99.3% is 4.0kg contains SiO262.2%, Al2O318.2% feldspar is 4.0kg, and the ferrotianium containing Ti28.5% is 1.2kg, is contained SiO298.6% silicon powder is 1.6kg, contains Na2O12.6%, ash content 28.2.0% sodium alginate be 0.6kg.
Above-mentioned coating powder is mixed after mixing, the potassium-sodium water glass 7.8kg mixing that addition concentration is 37 °~39 ° is equal It is even, it is then fed into plodder and is wrapped on high manganese core wire, then bake 4 hours, 350- through 180-120 DEG C of low temperature 380 DEG C of high temperature bake 1.5 hours to get the mating acidic electrode 1 of the high manganese austenite low-temperature steel of LNG storage tank peculiar to vessel.
The mating acidic electrode 1 of the resulting high manganese austenite low-temperature steel of LNG storage tank peculiar to vessel is subjected to Welding experiment, electricity when welding Arc is stablized, and coating is not easy rubescent cracking, splashes small, and de- slag is good, and appearance of weld is beautiful, good operation performance.Its deposited metal composition: C:0.32%, Mn:23.80%, Si:0.69%, Cr:4.96%, Ni:3.42%, Mo:1.80%, S:0.0003%, P: 0.0081%, surplus is Fe and inevitable impurity.
Mechanical property under deposited metal room temperature: tensile strength Rm=710Mpa, yield strength Rp0.2=465Mpa, prolong Stretch rate A=48.0%, impact Akv (- 196 DEG C) average value 103J, weld seam middle part hardness (HV10) average value 233.
Embodiment 2
For the present embodiment in addition to Ingredients Weight each in coating powder is different, remaining is all the same with embodiment 1.
Each Ingredients Weight is as follows in coating in the present embodiment: containing CaCO398.60% marble is 8.0kg, is contained CaF296.90% fluorite is 5.0kg, contains TiO297.2% rutile is 11.0kg, and the metal nickel powder containing Ni99.6% is 0.5kg, the crome metal containing Cr98.5% are 1.2kg, and the molybdenum-iron containing Mo56.3% is 0.5kg, and the electrolytic manganese containing Mn99.3% is 5.0kg contains SiO262.2%, Al2O318.2% feldspar is 2.0kg, and the ferrotianium containing Ti28.5% is 1.6kg, is contained SiO298.6% silicon powder is 2.2kg, contains Na2O12.6%, ash content 28.2.0% sodium alginate be 0.6kg.
The resulting mating acidic electrode 2 of the high manganese austenite low-temperature steel of LNG storage tank peculiar to vessel is subjected to Welding experiment, deposition gold Belong to ingredient: C:0.34%, Mn:24.99%, Si:0.53%, Cr:4.65%, Ni:3.14%, Mo:1.62%, S: 0.0002%, P:0.0074%, surplus are Fe and inevitable impurity.
Mechanical property under deposited metal room temperature: tensile strength Rm=702Mpa, yield strength Rp0.2=447Mpa, prolong Stretch rate A=47.0%, impact Akv (- 196 DEG C) average value 107J, weld seam middle part hardness (HV10) average value 245.
Embodiment 3
For the present embodiment in addition to Ingredients Weight each in coating is different, remaining is all the same with embodiment 1.
Each Ingredients Weight is as follows in coating in the present embodiment: containing CaCO398.60% marble is 6.0kg, is contained CaF296.90% fluorite is 9.0kg, contains TiO297.2% rutile is 9.0kg, and the metal nickel powder containing Ni99.6% is 1.0kg, the crome metal containing Cr98.5% are 0.6kg, and the molybdenum-iron containing Mo56.3% is 0.2kg, and the electrolytic manganese containing Mn99.3% is 6.0kg contains SiO262.2%, Al2O318.2% feldspar is 3.0kg, and the ferrotianium containing Ti28.5% is 0.8kg, is contained SiO298.6% silicon powder is 1.0kg, contains Na2O12.6%, ash content 28.2.0% sodium alginate be 0.6kg.
The resulting mating acidic electrode 3 of the high manganese austenite low-temperature steel of LNG storage tank peculiar to vessel is subjected to Welding experiment, deposition gold Belong to ingredient: C:0.36%, Mn:25.70%, Si:0.48%, Cr:4.32%, Ni:3.97%, Mo:1.43%, S: 0.0002%, P:0.0072%, surplus are Fe and inevitable impurity.
Mechanical property under deposited metal room temperature: tensile strength Rm=713Mpa, yield strength Rp0.2=496Mpa, prolong Stretch rate A=45.0%, impact Akv (- 196 DEG C) average value 99J, weld seam middle part hardness (HV10) average value 229.
The present invention is matched using high manganese core wire and coating of the present invention it can be seen from the result that embodiment 1-3 is detected Close the welding high manganese austenite steel of LNG storage tank, the deposited metal composition and excellent in mechanical performance of postwelding.
Comparative example 1
For the present embodiment in addition to welding rod (core wire and coating) is different, remaining condition and embodiment 1 are all the same.
The present embodiment core wire ingredient (wt%) such as following table one:
Table one
C Mn Si Cr Ni S P
≤0.40 23.0-27.0 0.8-1.5 4.0-7.0 4.0-6.0 ≤0.02 ≤0.02
Each ingredient in coating are as follows: marble 8.0-13.0 parts by weight, fluorite 3.0-8.0 parts by weight, rutile 10.0-15.0 Parts by weight, metal nickel powder 0.8-1.5 parts by weight, crome metal 1.0-3.0 parts by weight, mid-carbon fe-mn 5.0-8.0 parts by weight, oryolite 1.0-3.0 parts by weight, silicon powder 2.0-4.0 parts by weight, sodium alginate 0.4-0.6 parts by weight.
Deposited metal composition (mass fraction) such as following table two:
Table two
C Mn Si Cr Ni Mo S P
0.61 23.40 0.96 6.20 4.85 0.02 0.0005 0.0094
Deposited metal mechanical property such as following table three:
Table three
Sample state Rm(MPa) RP0.2(MPa) A (%) -196℃KV2(J) HV10
It is as-welded 796 510 26.5 33 352
From above-mentioned table two and table three as can be seen that the welding rod of the present embodiment is not able to satisfy the high manganese Austria of LNG storage tank peculiar to vessel The welding of family name's body hypothermia steel, because -196 DEG C of ballistic works of this example are relatively low, and plumb joint hardness is higher, and toughness is poor.
The present invention has good welding usability, and arc stability, de- slag is excellent, it is small to splash, forming beauty, at low cost Honest and clean, and mechanical performance is more excellent, acidic electrode of the present invention welds a kind of manganese content in 13% or more ultralow temperature potassium steel It may replace Ni-based base material and wlding and be able to satisfy -196 DEG C of ultralow temperature requirements.

Claims (10)

1. a kind of mating acidic electrode of high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel by core wire and is wrapped in core wire surface Coating composition, it is characterised in that the coating composition and content are as follows: marble 6.0-10.0 parts by weight, fluorite 5.0-9.0 parts by weight, Rutile 7.0-11.0 parts by weight, metal nickel powder 0.5-1.0 parts by weight, crome metal 0.6-1.8 parts by weight, molybdenum-iron 0.2-0.8 weight Measure part, electrolytic manganese 4.0-6.0 parts by weight, feldspar 2.0-4.0 parts by weight, ferrotianium 0.8-1.6 parts by weight, silicon powder 1.0-2.2 weight Measure part, sodium alginate 0.4-0.6 parts by weight.
2. the mating acidic electrode of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel according to claim 1, feature exist In: the coating weight is the 30-45% of high manganese core wire weight.
3. the mating acidic electrode of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel according to claim 2, feature exist In: CaCO in the marble3Content >=96%, CaF in fluorite2Content >=96%, TiO in rutile2>=95.5%, metal Ni >=99.5% in nickel powder, Cr >=98.0% in crome metal, Mo55-60% in molybdenum-iron, Mn >=99.0% in electrolytic manganese, in feldspar SiO2>=60.0%, Al2O3>=16.0%, Ti25.0-35.0% in ferrotianium, SiO in silicon powder2>=98.0%, in sodium alginate Na2O9.0-13.0%, ash content 20.0-30.0%.
4. the mating acidic electrode of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel according to claim 1 to 3, special Sign be the core wire ingredient are as follows: C≤0.25wt%, Mn26.5-29.00wt%, Si≤1.00wt%, Cr≤5.00wt%, Ni≤5.0wt%, S≤0.010t% and P≤0.015wt%, surplus are Fe and inevitable impurity.
5. the mating acidic electrode of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel according to claim 4, feature exist In: the core wire ingredient be C0.24%, Mn27.1%, Si0.65%, Cr3.20%, Ni1.48%, S0.0026% and P0.0076%, surplus are Fe and inevitable impurity.
6. -5 any mating acidic electrode of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel according to claim 1, special Sign is: the marble is 10.0 parts by weight, fluorite is 7.0 parts by weight, rutile is 7.0 parts by weight, metal nickel powder 0.8 Parts by weight, crome metal are 1.8 parts by weight, molybdenum-iron is 0.8 parts by weight, electrolytic manganese is 4.0 parts by weight, feldspar is 4.0 parts by weight, titanium Iron is 1.2 parts by weight, silicon powder is 1.6 parts by weight, 0.6 parts by weight of sodium alginate；Or
The marble is 8.0 parts by weight, fluorite is 5.0 parts by weight, rutile is 11.0 parts by weight, metal nickel powder is 0.5 weight Measure part, crome metal is 1.2 parts by weight, molybdenum-iron is 0.5 parts by weight, electrolytic manganese is 5.0 parts by weight, feldspar is 2.0 parts by weight, ferrotianium It is 2.2 parts by weight, 0.6 parts by weight of sodium alginate for 1.6 parts by weight, silicon powder；Or
The marble is 6.0 parts by weight, fluorite is 9.0 parts by weight, rutile is 9.0 parts by weight, metal nickel powder is 1.0 weight Part, crome metal are 0.6 parts by weight, molybdenum-iron is 0.2 parts by weight, electrolytic manganese is 6.0 parts by weight, feldspar is 3.0 parts by weight, ferrotianium is 0.8 parts by weight, silicon powder are 1.0 parts by weight, 0.6 parts by weight of sodium alginate.
7. the mating acidity of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel described in a kind of claim 1-6 any claim The preparation method of welding rod, comprising the following steps:
1. above-mentioned powder is uniformly mixed；
2. the potassium-sodium water glass that concentration is 37 °~40 ° is added to be uniformly mixed；
It is wrapped on core wire 3. being sent into plodder, then bakes 4 hours, 350-380 DEG C of high temperature baking through 80-120 DEG C of low temperature Roasting 1.5 hours to get the mating acidic electrode of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel.
8. a kind of welding method of the high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel, which is appointed using claim 1-6 The mating acidic electrode welding of the high Manganese Austenitic Cryogenic Steels of the LNG storage tank peculiar to vessel high manganese austenite of LNG storage tank peculiar to vessel described in one is super Low-temperature steel.
9. a kind of mating acidic electrode welding of any high Manganese Austenitic Cryogenic Steels of LNG storage tank peculiar to vessel of claim 1-6 Plumb joint, the plumb joint deposited metal composition are as follows: C0.32-0.36%, Mn23.80-25.70%, Si0.48-0.69%, Cr4.32-4.96%, Ni3.14-3.97%, Mo1.43-1.80%, S0.0002-0.0003% and P0.0072-0.0081%, Surplus is Fe and inevitable impurity.
10. the high Manganese Austenitic Cryogenic Steels plumb joint of LNG storage tank peculiar to vessel according to claim 9, it is characterised in that: described Mechanical property under deposited metal room temperature: tensile strength Rm=702-713Mpa, yield strength Rp0.2=447-496Mpa, prolong Stretch rate A=45.0-48.0%, impact Akv (- 196 DEG C) average value 99-107J, weld seam middle part hardness (HV10) average value 229- 245。
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