CN110170765B - High-manganese austenite ultralow-temperature steel matched acid welding rod for marine LNG storage tank and preparation method thereof - Google Patents

High-manganese austenite ultralow-temperature steel matched acid welding rod for marine LNG storage tank and preparation method thereof Download PDF

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CN110170765B
CN110170765B CN201910441251.6A CN201910441251A CN110170765B CN 110170765 B CN110170765 B CN 110170765B CN 201910441251 A CN201910441251 A CN 201910441251A CN 110170765 B CN110170765 B CN 110170765B
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parts
percent
storage tank
lng storage
welding rod
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CN110170765A (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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ATLANTIC CHINA WELDING CONSUMABLES Inc
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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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention discloses an acid welding rod matched with high-manganese austenitic ultralow-temperature steel of a marine LNG storage tank, which consists of a core wire and a coating wrapped on the surface of the core wire, wherein the coating consists of the following components in percentage by weight: 6.0 to 10.0 weight portions of marble, 5.0 to 9.0 weight portions of fluorite, 7.0 to 11.0 weight portions of rutile, 0.5 to 1.0 weight portion of metallic nickel powder, 0.6 to 1.8 weight portions of metallic chromium, 0.2 to 0.8 weight portion of ferromolybdenum, 4.0 to 6.0 weight portions of electrolytic manganese, 2.0 to 4.0 weight portions of feldspar, 0.8 to 1.6 weight portions of ferrotitanium, 1.0 to 2.2 weight portions of silicon micropowder and 0.4 to 0.6 weight portion of sodium alginate. Compared with the prior art, the impact function of the welding rod of the invention reaches more than 60J at-196 ℃ under the condition that the strength of the welding deposited metal is more than 660 MPa.

Description

High-manganese austenite ultralow-temperature steel matched acid welding rod for marine LNG storage tank and preparation method thereof
Technical Field
The technical field of welding material preparation is related to, more specifically, relate to a marine LNG storage tank high manganese austenite ultralow temperature steel matched acid welding rod, a marine LNG storage tank high manganese austenite ultralow temperature steel matched acid welding rod preparation method, a marine LNG storage tank high manganese austenite ultralow temperature steel welding method and a marine LNG storage tank high manganese austenite ultralow temperature steel welding head.
Background
In the presence of increasingly serious ecological environmental pollution, people select natural gas which is clean and efficient ecological high-quality energy and fuel in order to optimize an energy consumption structure, improve atmospheric environment and realize an economic development strategy of sustainable development. Nowadays, both industrial and domestic use are increasingly dependent on natural gas. The world of advanced and environmentally friendly countries is spreading the use of LNG as fuel for power plants, factories and domestic users.
LNG is generally stored and transported at-163 ℃, and at present, 9% Ni steel, Ni36 invar alloy, austenitic stainless steel, 5XXX series aluminum alloy, etc. are mainly used as the main materials of LNG storage tanks. These materials have the disadvantages of high cost, low design strength, poor welding processability, etc., for example, the use amount of noble metals such as Ni is high (the Ni content of 9% Ni steel is about 9%, and the Ni content of welding materials is higher than 50%), and the cost of steel plates and welding materials is difficult to reduce, thereby being restricted in application.
The high manganese steel for ultralow temperature is prepared by adding Mn with the mass fraction of more than 22% into steel to replace nickel used in the traditional low-temperature steel, reasonably proportioning Mn and C, and performing appropriate solution treatment, and can realize good combination of strength and toughness at low temperature. The high manganese steel for ultra-low temperatures is stable at LNG storage temperatures, can be reduced in cost to a large extent, and has attracted attention as a new material for second-generation LNG storage tanks. The development of the matched welding material suitable for the high manganese steel for ultralow temperature can effectively reduce the total construction cost of an LNG project.
CN109623194A discloses a low-hydrogen type welding rod for ultralow-temperature high-manganese steel manual arc welding, the chemical composition of a welding rod core is as follows: c: 0.30 to 0.75 wt%, Mn: 20-26 wt%, Ni: 6.5-8.5 wt%, Cr: 3.0-5.5 wt%, W: 2.5-4.0 wt%, P is less than or equal to 0.002 wt%, S is less than or equal to 0.001 wt%, and the balance is Fe and inevitable impurities; the chemical components of the coating are as follows: 35-40 wt% of marble, 16-22 wt% of fluorite, 3-5 wt% of quartz sand, 3-6 wt% of zircon sand, 4-10 wt% of rutile, 5-10 wt% of ferrotitanium, 5-8 wt% of low-carbon ferromanganese, 3-6 wt% of ferrosilicon, 1-2 wt% of rare ferrosilicon, 2-3 wt% of synthetic mica, 1-2 wt% of soda ash, and 100 wt% of the components, adding a binder, mixing according to a conventional method, wrapping on a welding core, and baking at low and high temperatures. However, when the welding rod is used for welding the high-manganese austenitic ultralow-temperature steel of the LNG storage tank for the ship, the following defects are found through research:
1. the high content of C in the chemical components of the core wire is high, and the higher the content of C in the high manganese steel is, the higher the work hardening degree is, which is not beneficial to the manufacture of drawing, shredding and the like of the core wire. And too high C is transferred into the welding joint, so that the precipitation tendency of grain boundary carbide is greatly increased, and the mechanical property of the welding joint is influenced.
2. 6.5-8.5 wt% of Ni and 2.5-4.0 wt% of W are adopted in the core wire, so that the cost of the core wire and the product cost of the welding rod are high.
Disclosure of Invention
The invention aims to provide an acid welding rod matched with high-manganese austenitic ultralow-temperature steel for a marine LNG storage tank, wherein the impact function of the welding rod at-196 ℃ is more than 60J under the condition that the strength of the welding deposited metal is more than 660 MPa.
The technical scheme is as follows: the high manganese austenite ultralow temperature steel matched acid welding rod for the marine LNG storage tank and the preparation method thereof comprise a core wire and a coating wrapped on the surface of the core wire, wherein the coating comprises the following components in percentage by weight: 6.0 to 10.0 weight portions of marble, 5.0 to 9.0 weight portions of fluorite, 7.0 to 11.0 weight portions of rutile, 0.5 to 1.0 weight portion of metallic nickel powder, 0.6 to 1.8 weight portions of metallic chromium, 0.2 to 0.8 weight portion of ferromolybdenum, 4.0 to 6.0 weight portions of electrolytic manganese, 2.0 to 4.0 weight portions of feldspar, 0.8 to 1.6 weight portions of ferrotitanium, 1.0 to 2.2 weight portions of silicon micropowder and 0.4 to 0.6 weight portion of sodium alginate.
Preferably, the weight of the flux coating is 30-45% of the weight of the high-manganese alloy core wire.
Preferably, CaCO in the marble3The content is more than or equal to 96 percent, and the CaF in fluorite2The content is more than or equal to 96 percent, and TiO in rutile2More than or equal to 95.5 percent, more than or equal to 99.5 percent of Ni in the metal nickel powder, more than or equal to 98.0 percent of Cr in the metal chromium, 55-60 percent of Mo in the ferromolybdenum, more than or equal to 99.0 percent of Mn in the electrolytic manganese, and SiO in the feldspar2≥60.0％、Al2O3Not less than 16.0 percent, Ti25.0 to 35.0 percent in ferrotitanium and SiO in silicon micropowder2Not less than 98.0 percent and Na in sodium alginate29.0-13.0% of O and 20.0-30.0% of ash.
Preferably, the core wire comprises the following components: less than or equal to 0.25 wt% of C, 26.50-29.00 wt% of Mn26.00, less than or equal to 1.00 wt% of Si, less than or equal to 5.00 wt% of Cr, less than or equal to 5.0 wt% of Ni, less than or equal to 0.010 t% of S, less than or equal to 0.015 wt% of P, and the balance of Fe and inevitable impurities.
Preferably, the core wire component is C0.24%, mn27.1%, si 0.65%, cr 3.20%, ni 1.48%, S0.0026%, and P0.0076%, with the balance being Fe and inevitable impurities.
Preferably, the marble comprises 10.0 parts by weight, the fluorite comprises 7.0 parts by weight, the rutile comprises 7.0 parts by weight, the metallic nickel powder comprises 0.8 part by weight, the metallic chromium comprises 1.8 parts by weight, the ferromolybdenum comprises 0.8 part by weight, the electrolytic manganese comprises 4.0 parts by weight, the feldspar comprises 4.0 parts by weight, the ferrotitanium comprises 1.2 parts by weight, the silicon micropowder comprises 1.6 parts by weight, and the sodium alginate comprises 0.6 part by weight; or
8.0 parts of marble, 5.0 parts of fluorite, 11.0 parts of rutile, 0.5 part of metallic nickel powder, 1.2 parts of metallic chromium, 0.5 part of ferromolybdenum, 5.0 parts of electrolytic manganese, 2.0 parts of feldspar, 1.6 parts of ferrotitanium, 2.2 parts of silicon micropowder and 0.6 part of sodium alginate; or
6.0 parts of marble, 9.0 parts of fluorite, 9.0 parts of rutile, 1.0 part of metallic nickel powder, 0.6 part of metallic chromium, 0.2 part of ferromolybdenum, 6.0 parts of electrolytic manganese, 3.0 parts of feldspar, 0.8 part of ferrotitanium, 1.0 part of silicon micropowder and 0.6 part of sodium alginate.
The invention also aims to provide a preparation method of the acid welding rod matched with the high-manganese austenitic ultralow-temperature steel for the marine LNG storage tank.
The technical scheme is as follows: a preparation method of an acid welding rod matched with a high-manganese austenite ultralow-temperature steel for a marine LNG storage tank comprises the following steps:
uniformly mixing the powder;
secondly, adding the potassium-sodium water glass with the concentration of 37-40 degrees and uniformly mixing;
thirdly, the welding rod is sent into a layering machine to be wrapped on the welding core, and then the welding rod is baked for 4 hours at the low temperature of 80-120 ℃ and 1.5 hours at the high temperature of 380 ℃ together with 350 ℃ to obtain the acid welding rod matched with the high manganese austenite ultralow temperature steel of the LNG storage tank for the ship.
The invention also aims to provide a welding method of the high-manganese austenitic ultralow-temperature steel for the marine LNG storage tank.
The technical scheme is as follows: the welding method adopts the high manganese austenite ultralow temperature steel of the marine LNG storage tank and an acid welding rod matched with the high manganese austenite ultralow temperature steel to weld the high manganese austenite ultralow temperature steel of the marine LNG storage tank.
The fourth purpose of the invention is to provide a welding joint for welding the high manganese austenite ultralow temperature steel matched with the acid welding rod of the marine LNG storage tank.
The technical scheme is as follows: the utility model provides a supporting acid welding rod welded soldered connection of marine LNG storage tank high manganese austenite ultra-low temperature steel, this soldered connection deposit metal composition is: 0.32 to 0.36 percent of C, 23.80 to 25.70 percent of Mn23.48 to 0.69 percent of Si, 4.32 to 4.96 percent of Cr4, 3.14 to 3.97 percent of Ni3, 1.43 to 1.80 percent of Mo1, 0.0002 to 0.0003 percent of S and 0.0072 to 0.0081 percent of P, and the balance of Fe and inevitable impurities.
Preferably, the deposited metal has mechanical properties at normal temperature: tensile strength Rm-.
In order to facilitate understanding of the invention, the main functions and the invention principle of each component of the raw materials of the Chinese medicine skin are explained as follows:
and (3) marble: the slag-making and gas-making materials which are very commonly used in the manufacture of the welding rod can improve the alkalinity of the molten slag, refine molten drops, stabilize electric arc, increase the interfacial tension of the molten slag and metal, improve slag removal and have better desulfurization capability.
Fluorite: the surface tension of liquid metal can be reduced, the fluidity of slag is improved, the sensitivity of weld pores is reduced, the physical properties of the slag are improved, and the method plays a key role in weld forming, slag removal and the like.
Rutile: the main functions are to stabilize electric arc, slag formation, adjust melting point, viscosity, surface tension and fluidity of slag, improve weld formation and reduce welding spatter.
Metallic nickel powder: alloying agent for transition (infiltration) of Ni element to weld seam. Nickel is an alloy element for stabilizing austenite in a welding joint, and when the content of Ni in the welding joint is 3% -5%, the nickel has the effects of inhibiting carbon from desolventizing from austenite, reducing the precipitation tendency of grain boundary carbide, remarkably reducing the number of intercrystalline carbide and the like. And Ni also improves the low-temperature mechanical property of the high manganese steel and improves the oxidation resistance and the crack resistance of the high manganese steel.
Metallic chromium: the chromium element can be transited (infiltrated) to the welding seam, and the strength, yield point and corrosion resistance of the welding seam metal are improved.
Ferromolybdenum: the alloying agent is in the form of ferroalloy, has stable transition and small fluctuation, and can effectively improve the strength. Molybdenum can effectively inhibit precipitation of grain boundary carbides in the cooling process of the high manganese steel welding joint. The addition of chromium in the high manganese steel increases the precipitation tendency of grain boundary carbides, and the composite addition of molybdenum and chromium in the high manganese steel can simultaneously exert the beneficial effects of two alloy elements.
Electrolytic manganese: the addition of the manganese element can play roles in desulfurization and deoxidation, and can also transfer (infiltrate) the manganese element into the weld joint and improve the strength of the weld joint.
Feldspar: the function of the welding rod is slagging, stabilizing electric arc, refining molten drop and improving the melting speed of the welding rod.
Titanium iron: it is used as deoxidant and alloying agent in welding rod to stabilize electric arc and transform Ti element to weld seam. According to the invention, a small amount of titanium is added, so that grains can be effectively refined, and the crack resistance is improved.
Silicon micropowder: it is used as deoxidizer in welding rod, and is favorable to stabilizing electric arc, refining molten drop and improving physical performance of molten slag. Silicon is not suitable for high content because silicon accelerates segregation of carbon element, increases carbide on grain boundary, and deteriorates toughness of high manganese steel.
Sodium alginate: the welding rod has the function of improving the powder viscosity, and is beneficial to the eccentric stability in the compression coating process of the welding rod.
Has the advantages that:
the core wire adopted by the invention has simple components and lower cost; the flux coating has a simple composition structure, a deposited metal alloy system is reasonably matched with the high-manganese austenitic low-temperature steel of the LNG storage tank as the base material, the chemical composition analysis, the ray detection and the tensile test of welding deposited metal meet the special requirements of welding materials for the high-manganese austenitic low-temperature steel of the marine LNG storage tank, and the tensile strength (Rm) and the yield strength (R) of the welding deposited metal under the normal-temperature condition in a welding state are realizedp0.2) The elongation (A), the (-196 ℃) impact energy (Akv), the weld hardness and other mechanical properties are good, and particularly the-196 ℃ impact energy reaches more than 60J under the condition that the strength is more than 660 MPa. The electric arc is stable during welding, the coating is not easy to redden and crack, the splashing is small, the slag removal is good, the weld joint is attractive in forming, and the operation performance is good.
Definition and interpretation
Abbreviation for LNG-liquefied natural gas (liquefiednaturalgas).
Unless otherwise specified, the symbols are mass%.
Unless otherwise specified, all the articles used in the present invention are commercially available products.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Taking 100kg of high-manganese alloy core wire, wherein the core wire comprises the following components in percentage by weight: c: 0.24%, Mn: 25.10%, Si: 0.65%, Cr: 3.20%, Ni: 1.48%, S: 0.0026%, P: 0.0076% and the balance of Fe and impurities.
Taking the coating powder, wherein the coating powder comprises the following components in parts by weight: containing CaCO398.60% marble of 10.0kg, CaF296.90% fluorite 7.0kg, TiO content27.0kg of 97.2% rutile, 0.8kg of metal nickel powder containing 99.6% of Ni0, 1.8kg of metal chromium containing 98.5% of Cr0, 0.8kg of ferromolybdenum containing 56.3% of Mos, 4.0kg of electrolytic manganese containing 99.3% of Mn99, and SiO262.2％、Al2O34.0kg of 18.2 percent of feldspar, 1.2kg of ferrotitanium containing 28.5 percent of TiFe and SiO298.6% of silicon powder is 1.6kg, and contains Na2O12.6% and ash 28.20% of sodium alginate is 0.6 kg.
And (3) uniformly mixing the coating powder, adding 7.8kg of sodium-potassium water glass with the concentration of 37-39 degrees, uniformly mixing, conveying into a layering machine, wrapping the coating on a high-manganese alloy core wire, and baking at the low temperature of 120 ℃ for 4 hours and at the high temperature of 380 ℃ for 1.5 hours by using 180 ℃ and 180 ℃ to obtain the acid welding rod 1 matched with the high-manganese austenite low-temperature steel of the LNG storage tank for the ship.
The obtained high-manganese austenite low-temperature steel for the marine LNG storage tank is matched with the acid welding rod 1 for welding experiments, so that electric arc is stable during welding, a coating is not prone to red cracking, splashing is small, slag removal is good, a welding seam is attractive in appearance, and operation performance is good. The deposited metal components are as follows: c: 0.32%, Mn: 23.80%, Si: 0.69%, Cr: 4.96%, Ni: 3.42%, Mo: 1.80%, S: 0.0003%, P: 0.0081%, and the balance of Fe and inevitable impurities.
Mechanical properties of deposited metal at normal temperature: tensile strength Rm 710MPa, yield strength Rp0.2 465MPa, elongation A48.0%, impact Akv (-196 ℃) average value 103J, and weld middle hardness (HV10) average value 233.
Example 2
The present example is the same as example 1 except that the weight of each component in the coating powder is different.
The weight of each component in the coating in the embodiment is as follows: containing CaCO398.60% marble of 8.0kg, CaF296.90% fluorite 5.0kg, TiO content211.0kg of 97.2% rutile, 0.5kg of metal nickel powder containing 99.6% of Ni0, 1.2kg of metal chromium containing 98.5% of Cr0, 0.5kg of ferromolybdenum containing 56.3% of Mos, 5.0kg of electrolytic manganese containing 99.3% of Mn99, and 5.0kg of electrolytic manganese containing SiO262.2％、Al2O32.0kg of 18.2 percent of feldspar, 1.6kg of ferrotitanium containing 28.5 percent of TiFe and SiO298.6% of silicon powder is 2.2kg, and contains Na2O12.6% and ash 28.20% of sodium alginate is 0.6 kg.
The obtained high manganese austenite low-temperature steel for the marine LNG storage tank is matched with an acid welding rod 2 to carry out a welding experiment, and deposited metal components of the acid welding rod are as follows: c: 0.34%, Mn: 24.99%, Si: 0.53%, Cr: 4.65%, Ni: 3.14%, Mo: 1.62%, S: 0.0002%, P: 0.0074% and the balance of Fe and inevitable impurities.
Mechanical properties of deposited metal at normal temperature: tensile strength Rm 702MPa, yield strength Rp0.2 447MPa, elongation A47.0%, impact Akv (-196 ℃) average value 107J, and weld middle hardness (HV10) average value 245.
Example 3
The present example is the same as example 1 except that the weight of each component in the coating is different.
The weight of each component in the coating in the embodiment is as follows: containing CaCO398.60% marble of 6.0kg, CaF296.90% fluorite 9.0kg, TiO content297.2% rutile 9.0kg, and Ni99.6% metallic nickel powder 1.0kg, 0.6kg of Cr98.5% metal chromium, 0.2kg of Mo56.3% ferromolybdenum, 6.0kg of Mn99.3% electrolytic manganese and SiO262.2％、Al2O33.0kg of 18.2 percent of feldspar, 0.8kg of ferrotitanium containing 28.5 percent of TiFe and SiO298.6% of silicon powder is 1.0kg, and contains Na2O12.6% and ash 28.20% of sodium alginate is 0.6 kg.
The obtained high manganese austenite low-temperature steel for the marine LNG storage tank is matched with an acid welding rod 3 to carry out a welding experiment, and deposited metal components of the acid welding rod are as follows: c: 0.36%, Mn: 25.70%, Si: 0.48%, Cr: 4.32%, Ni: 3.97%, Mo: 1.43%, S: 0.0002%, P: 0.0072% and the balance of Fe and inevitable impurities.
Mechanical properties of deposited metal at normal temperature: tensile strength Rm 713MPa, yield strength Rp0.2 496MPa, elongation A45.0%, impact Akv (196 ℃) average value 99J, and weld joint middle hardness (HV10) average value 229.
As can be seen from the results of the tests in the examples 1 to 3, the high manganese austenitic steel of the LNG storage tank is welded by matching the high manganese alloy core wire and the coating, and the welded deposited metal component and the mechanical property are excellent.
Comparative example 1
The same conditions as in example 1 were used except that the electrodes (core wire and coating) were different.
The core wire composition (wt%) of this example is as follows:
watch 1
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
The medicine skin comprises the following components: 8.0 to 13.0 weight portions of marble, 3.0 to 8.0 weight portions of fluorite, 10.0 to 15.0 weight portions of rutile, 0.8 to 1.5 weight portions of metallic nickel powder, 1.0 to 3.0 weight portions of metallic chromium, 5.0 to 8.0 weight portions of medium carbon ferromanganese, 1.0 to 3.0 weight portions of ice crystal powder, 2.0 to 4.0 weight portions of silicon micropowder and 0.4 to 0.6 weight portion of sodium alginate.
The deposited metal comprises the following chemical components (mass fraction) in the following table II:
watch 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
The deposited metal has the following mechanical properties:
watch III
State of the sample Rm(MPa) RP0.2(MPa) A(％) -196℃KV2(J) HV10
Welded state 796 510 26.5 33 352
As can be seen from the second and third tables, the welding rod of this embodiment can not satisfy the welding of the high manganese austenite low temperature steel of the LNG storage tank for the ship at all because the impact energy at 196 ℃ below zero of this example is low, and the hardness of the welding head is high and the toughness is poor.
The acid welding rod has the advantages of good welding manufacturability, stable electric arc, excellent slag removal, small splashing, attractive forming, low cost and more excellent mechanical property, and can replace nickel-based base metal and welding material and meet the requirement of ultralow temperature of-196 ℃ when the acid welding rod is used for welding the ultralow-temperature high-manganese steel with the manganese content of more than 13 percent.

Claims (7)

1. The utility model provides a supporting acid welding rod of marine LNG storage tank high manganese austenite ultra-low temperature steel, comprises core wire and the coating of wrapping up in the core wire surface, and its characterized in that this coating is constituteed and the content is: 6.0 to 10.0 weight portions of marble, 5.0 to 9.0 weight portions of fluorite, 7.0 to 11.0 weight portions of rutile, 0.5 to 1.0 weight portion of metallic nickel powder, 0.6 to 1.8 weight portions of metallic chromium, 0.2 to 0.8 weight portion of ferromolybdenum, 4.0 to 6.0 weight portions of electrolytic manganese, 2.0 to 4.0 weight portions of feldspar, 0.8 to 1.6 weight portions of ferrotitanium, 1.0 to 2.2 weight portions of silicon micropowder and 0.4 to 0.6 weight portion of sodium alginate; the core wire comprises the components of 0.24% of C, 27.1% of Mn, 0.65% of Si, 3.20% of Cr, 1.48% of Ni, 0.0026% of S and 0.0076% of P, and the balance of Fe and inevitable impurities.
2. The high manganese austenite ultra-low temperature steel matched acid welding rod for the marine LNG storage tank of claim 1, which is characterized in that: CaCO in the marble3The content is more than or equal to 96 percent, and the CaF in fluorite2The content is more than or equal to 96 percent, and TiO in rutile2More than or equal to 95.5 percent, more than or equal to 99.5 percent of Ni in the metal nickel powder, more than or equal to 98.0 percent of Cr in the metal chromium, 55-60 percent of Mo in the ferromolybdenum, and in the electrolytic manganeseMn is more than or equal to 99.0 percent, and SiO is contained in feldspar2≥60.0％、Al2O3Not less than 16.0 percent, Ti25.0 to 35.0 percent in ferrotitanium and SiO in silicon micropowder2Not less than 98.0 percent and Na in sodium alginate29.0-13.0% of O and 20.0-30.0% of ash.
3. The high manganese austenitic ultralow temperature steel matched acid welding rod for the marine LNG storage tank as claimed in any one of claims 1-2, characterized in that: 10.0 parts of marble, 7.0 parts of fluorite, 7.0 parts of rutile, 0.8 part of metallic nickel powder, 1.8 parts of metallic chromium, 0.8 part of ferromolybdenum, 4.0 parts of electrolytic manganese, 4.0 parts of feldspar, 1.2 parts of ferrotitanium, 1.6 parts of silicon micro powder and 0.6 part of sodium alginate; or
8.0 parts of marble, 5.0 parts of fluorite, 11.0 parts of rutile, 0.5 part of metallic nickel powder, 1.2 parts of metallic chromium, 0.5 part of ferromolybdenum, 5.0 parts of electrolytic manganese, 2.0 parts of feldspar, 1.6 parts of ferrotitanium, 2.2 parts of silicon micropowder and 0.6 part of sodium alginate; or
6.0 parts of marble, 9.0 parts of fluorite, 9.0 parts of rutile, 1.0 part of metallic nickel powder, 0.6 part of metallic chromium, 0.2 part of ferromolybdenum, 6.0 parts of electrolytic manganese, 3.0 parts of feldspar, 0.8 part of ferrotitanium, 1.0 part of silicon micropowder and 0.6 part of sodium alginate.
4. The preparation method of the high manganese austenite ultralow temperature steel matched acid welding rod for the marine LNG storage tank as claimed in any one of claims 1 to 3, comprises the following steps:
uniformly mixing the medicinal skins;
secondly, adding the potassium-sodium water glass with the concentration of 37-40 degrees and uniformly mixing;
thirdly, the welding rod is sent into a layering machine to be wrapped on the welding core, and then the welding rod is baked for 4 hours at the low temperature of 80-120 ℃ and 1.5 hours at the high temperature of 380 ℃ together with 350 ℃ to obtain the acid welding rod matched with the high manganese austenite ultralow temperature steel of the LNG storage tank for the ship.
5. A welding method of high manganese austenite ultralow temperature steel of a marine LNG storage tank, which adopts the high manganese austenite ultralow temperature steel of the marine LNG storage tank as claimed in any one of claims 1 to 3 and an acid welding rod to weld the high manganese austenite ultralow temperature steel of the marine LNG storage tank.
6. A welded joint for welding the high manganese austenitic ultralow temperature steel for the marine LNG storage tank as set forth in any one of claims 1 to 3 with an acid welding rod, the deposited metal composition of the welded joint being: 0.32 to 0.36 percent of C, 23.80 to 25.70 percent of Mn23.48 to 0.69 percent of Si, 4.32 to 4.96 percent of Cr, 3.14 to 3.97 percent of Ni, 1.43 to 1.80 percent of Mo, 0.0002 to 0.0003 percent of S, 0.0072 to 0.0081 percent of P, and the balance of Fe and inevitable impurities.
7. The marine LNG storage tank high manganese austenitic ultralow temperature steel mating acid electrode welded joint of claim 6, characterized in that: the deposited metal has the following mechanical properties at normal temperature: tensile strength Rm-.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103008913A (en) * 2012-12-17 2013-04-03 四川大西洋焊接材料股份有限公司 Corrosion-resistance stainless steel electric welding rod used for nuclear power and production method thereof
CN105772990A (en) * 2016-04-19 2016-07-20 南通豪泰焊材有限公司 Titanic-acid stainless steel welding electrode and manufacturing method thereof
CN107052622A (en) * 2016-12-27 2017-08-18 上海焊接器材有限公司 A kind of stainless steel electrode welded for low magnetic steel and preparation method thereof
CN107186382A (en) * 2017-06-09 2017-09-22 南京钢铁股份有限公司 A kind of high manganese ultralow temperature steel welding wire and its welding procedure
CN107900560A (en) * 2017-11-27 2018-04-13 四川大西洋焊接材料股份有限公司 Stainless steel welding electrode of corrosion-proof wear and preparation method thereof is repaired for Hydropower Unit
CN107931887A (en) * 2017-11-16 2018-04-20 天津大桥焊材集团有限公司 A kind of end socket special stainless steel gas shielded arc welding flux-cored wire and preparation method thereof
CN108907494A (en) * 2018-06-01 2018-11-30 四川大西洋焊接材料股份有限公司 Nuclear power AG728 steel electrode and preparation method
CN109570824A (en) * 2018-11-07 2019-04-05 四川大西洋焊接材料股份有限公司 The pure austenite stainless steel-made welding rod of sulfuric acid corrosion resistant and preparation method of nickelic copper content low-heat crack sensitivity

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103008913A (en) * 2012-12-17 2013-04-03 四川大西洋焊接材料股份有限公司 Corrosion-resistance stainless steel electric welding rod used for nuclear power and production method thereof
CN105772990A (en) * 2016-04-19 2016-07-20 南通豪泰焊材有限公司 Titanic-acid stainless steel welding electrode and manufacturing method thereof
CN107052622A (en) * 2016-12-27 2017-08-18 上海焊接器材有限公司 A kind of stainless steel electrode welded for low magnetic steel and preparation method thereof
CN107186382A (en) * 2017-06-09 2017-09-22 南京钢铁股份有限公司 A kind of high manganese ultralow temperature steel welding wire and its welding procedure
CN107931887A (en) * 2017-11-16 2018-04-20 天津大桥焊材集团有限公司 A kind of end socket special stainless steel gas shielded arc welding flux-cored wire and preparation method thereof
CN107900560A (en) * 2017-11-27 2018-04-13 四川大西洋焊接材料股份有限公司 Stainless steel welding electrode of corrosion-proof wear and preparation method thereof is repaired for Hydropower Unit
CN108907494A (en) * 2018-06-01 2018-11-30 四川大西洋焊接材料股份有限公司 Nuclear power AG728 steel electrode and preparation method
CN109570824A (en) * 2018-11-07 2019-04-05 四川大西洋焊接材料股份有限公司 The pure austenite stainless steel-made welding rod of sulfuric acid corrosion resistant and preparation method of nickelic copper content low-heat crack sensitivity

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