CN104907730B - LNG structure and novel slag-system nickel-based welding rod for welding marine 9 nickel steel - Google Patents

LNG structure and novel slag-system nickel-based welding rod for welding marine 9 nickel steel Download PDF

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Publication number
CN104907730B
CN104907730B CN201510270814.1A CN201510270814A CN104907730B CN 104907730 B CN104907730 B CN 104907730B CN 201510270814 A CN201510270814 A CN 201510270814A CN 104907730 B CN104907730 B CN 104907730B
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content
welding
nickel
welding rod
coating
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CN104907730A (en
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何国
王皇
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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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
    • B23K35/3033—Ni as the principal 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
    • B23K35/22—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
    • B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
    • 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

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

Abstract

Provided are an LNG structure and a novel slag-system nickel-based welding rod for welding marine 9 nickel steel. The novel slag-system nickel-based welding rod for welding the marine 9 nickel steel comprises a welding core and a coating arranged on the surface of the welding core in a wrapping mode, the content of chemical components and weight percentage of the welding core comprises 0.02% or less of C, 0.01% or less of S, 0.01% or less of P, 99.0% or more of Ni, 0.50% or less of remaining elements, and the total amount of all the components is 100%; the content of components and the weight percentage of power materials in the coating comprises 5-15% of marble, 14-23% of cryolite, 5-10% of rutile, 5-10% of barium carbonate, 22-28% of chromium metal, 4-7% of manganese metal, 5-8% of molybdenum, 3-8% of ferromolybdenum, 2-4% of ferrotungsten, 3-7% of ferroniobium, 0.5-1.5% of organic matter, 0.5-1.5% of potassium titanate, 1-3% of silicon iron, 1-4% of ferrotitanium, and the total amount of all the components is 100%; the power materials of all the components are evenly mixed with water glass which accounts for 16%-35% of the total mass of the coating according to proportion, the mixture is conveyed to a press coating machine and arranged on the welding core in the wrapping mode, and the inverse proportion formula high-alkalinity slag-system nickel-based welding rod for welding the marine 9 nickel steel are obtained through low-temperature baking and high-temperature baking. According to the LNG structure and the inverse proportion formula high-alkalinity slag-system nickel-based welding rod for welding the marine 9 nickel steel, the comprehensive mechanical property can be achieved at the temperature of -196 DEG C, the welding technological property is achieved simultaneously, and all-position welding can be conducted.

Description

LNG structures and 9 nickel steel peculiar to vessel are welded with new slag system nickel-base welding rod
Technical field
The present invention relates to a kind of Nickel-welding Material, particularly a kind of to be applied to LNG structures and 9 nickel steel peculiar to vessel (also known as 9% Ni steel) the new slag system ENiCrFe-9 nickel-base welding rods that weld.
Background technology
With global industry, the quickening of IT application process, countries in the world are to energy demand sharp increase, while serious make About the energy shortage of sustainable economic development, pollution that caused by coal burning the problems such as also day by day expose.Natural gas is used as high-quality clean fuel With important chemical raw material, it has also become one of three big pillar energy of the world today.Over nearly 10 years, natural gas is in social development Status and effect become increasingly conspicuous, global natural gas production and to consume all be in steady-state growth situation, it is contemplated that to the global day of the year two thousand twenty So the 40% of gas volume of trade will be liquefied natural gas LNG (Liquefied Natural gas).The development of LNG has driven LNG products The development of industry, LNG industries include producing, transport, store, receiving and using five stages.In LNG transports, LNG ship is whole The pith of transit link.As LNG is that natural gas is cooled to -163 DEG C, i.e., LNG ship is transported under -162 DEG C of low temperature The specialized ships of liquefied gas, are a kind of " marine super van coolers ", i.e. the material of operating environment requirements manufacture LNG ship has preferably Low-temperature flexibility and in low temperature environment have preferable intensity.
The W of International nickel Co. Ltd. Inco. Ltd. of 9Ni Gang Shi nineteen forty-four U.S. exploitation(Ni)- 9% medium alloy steel, it is that a kind of low-carbon (LC) is quenched Steel.This steel have good toughness and high intensity under extremely low temperature, minimum reachable -196 DEG C using temperature, and with Austria Family name's body rustless steel is compared with aluminium alloy has the advantages that coefficient of thermal expansion is little, good economy performance, has shown that not welded from nineteen sixty research Since hidden lino removal can also be used safely afterwards, 9Ni steel just become for manufacture Large LNG storage tank main material it One.Good, its change that is mainly characterized by high nickel content, high cleanliness, higher-strength, high low-temperature impact toughness, weldability of 9Ni steel Study and be divided into：Ni：8.5～9.5%, C：0.0005～0.012%, Si：0.05～0.4%, Mn：0.30～0.80%, S≤ 0.005%th, P≤0.008%, Mo：0.05～0.013%, V≤0.01%.The mechanical property of 9Ni steel is：Tensile strength Rm： 680～820MPa, yield strength ReH >=570MPa, percentage elongation A >=20%, -196 DEG C of KV >=100J.
With the adjustment of China's energy strategy, LNG industries are always maintained at the impetus of fast development in China, LNG industries Development greatly improves the demand to 9Ni steel and 9Ni steel welding materials, but 9Ni steel welds welding rod to kind at present The development of 9Ni steel solder technology is much can not meet with performance also.
The content of the invention
It is an object of the present invention to provide a kind of LNG structures and 9 nickel steel peculiar to vessel welding are with new slag system nickel-base welding rod, with LNG structures and 9Ni steel welding requirements peculiar to vessel match, and makes deposited metal at -196 DEG C with matching with mother metal to reach The effect of low-temperature impact toughness, higher tensile strength and yield strength so that 9Ni steel can be abundant when applying in LNG ship Play mother metal itself premium properties, while welding rod welding when with good processing performance.
The technical scheme is that：
A kind of LNG structures and 9 nickel steel peculiar to vessel welding are with new slag system nickel-base welding rod, including core wire and wrap in core wire surface Coating, the chemical composition and its weight percent content of the core wire are：C≤0.02%, S≤0.01%, P≤0.01%, Ni >=99.0%, remaining constituent content≤0.50%, each composition total amount are 100%.
Used as further improving, in described coating, the composition and its weight percent content of powder is：Marble 5～ 15%th, cryolite 14～23%, rutile 5～10%, brium carbonate 5～10%, crome metal 22～28%, manganese metal 4～7%, Molybdenum 5～8%, molybdenum-iron 3～8%, ferrotungsten 2～4%, ferro-niobium 3～7%, Organic substance 0.5～1.5%, potassium titanate 0.5～1.5%, Ferrosilicon 1～3%, ferrotianium 1～4%, each composition total amount are 100%；The powder of each composition is proportionally uniformly mixed, is added The waterglass for accounting for the quality 16%～35% of powder in the coating uniformly mixes, and is then fed in extrusion press conventionally Wrapped on the core wire, after eventually passing low temperature baking and high temperature baking, become the Ni-based weldering of the new slag system Bar.
Used as further improving, in described coating, the mass percentage content of the main component of each powder is as follows：Dali CaCO in stone3Content >=96%；F content >=53% in cryolite, Na content≤31%, Al content >=13%；In ferro-niobium, Nb contains Measure as 50～65%；In ferrotungsten, W content is 70～80%；Cr content >=99% in crome metal, Mn content >=99% in manganese metal； Mo content >=99% in metal molybdenum；In molybdenum-iron, Mo contents are 55～65%, and in ferrotianium, Ti contents are 25～35%；In ferrosilicon, Si contains Measure as 40～45%；BaCO in brium carbonate3Content >=98%；TiO in potassium titanate2Content >=70%, K2O content is 17～21%.
Used as further improving, described waterglass is sodium silicate, KP1 or potassium-sodium water glass, and its Baume is dense Spend between 41 °～43 °.
Used as further improving, the temperature that described low temperature is bakeed is 100～150 DEG C；High temperature bakee temperature be 300～ 350℃。
In the coating raw material of the present invention, the Main Function of each composition is as follows：
Marble：Belong to slag making, gas generating materials, marble can increase slag basicity, increased metallurgical desulfuration ability, reduce The infiltration of silicon, increases the ratio of the slag system gas shielded, is conducive to the improvement of the physico-chemical property of slag, is conducive to de- slag and slag Protected effect.
KP1：As long as waterglass is used as binding agent, due to containing K so also stabilising arc effect, but excessive mistake Dense to cause that weldering speed is slow, splash big, the viscosity of slag is improved, and affects mechanical performance, and secondly modulus is too high promotes coating quick-drying to add By force, make electrode coating easily eccentric, used time coating intensity Jing after high temperature drying can also be reduced.
Organic substance：A small amount of Organic substance can improve extrusion performance, but Organic substance excessively easily makes weld seam produce pore.
Potassium titanate：Lubrication is acted primarily as, welding rod shaping easy to process is made；The stability of waterglass is improved in addition, is prevented The carrying out of waterglass hydrolysis.
Alloy：Various alloys are penetrated into, the scaling loss of alloying element in welding process are supplemented, is supplemented the alloying component in weld seam, Improve weld seam solidified structure, improve the mechanical property of weld seam.
Cryolite：Cryolite can effectively remove H, can reduce the surface tension of liquid metal, improve the flowing of slag Property；But in welding process, cryolite decomposition can produce harmful gass fluohydric acid gas, and excessive cryolite can cause electric arc not It is stable, it is therefore necessary to strictly to control its consumption.
Ferrotianium：Can effectively deoxidation, the TiO that its Ti and oxygen are generated2Also help de- slag.
Ferrosilicon：Can effectively deoxidation, but otherwise to easily cause deposited metal siliconising serious for the content that must control ferrosilicon.
Brium carbonate：Gas making slag making, increases the activity of slag, can make slag uniform fold in face of weld；Phase homogenous quantities Brium carbonate is compared with Calcium Carbonate, and brium carbonate can be with less generation carbon dioxide；But as barium is heavy metal, so must be tight Lattice control the content of brium carbonate.
Rutile：Slag making, can enable slag uniformly cover the surface of weld seam, and appropriate rutile is conducive to de- slag.
Compared with existing nickel-based welding electrode, the present invention has advantages below：
With excellent welding technological properties, all-position welding can be carried out；With good yield strength, tensile strength with And impact flexibility, especially at -196 DEG C still with good comprehensive mechanical property.
The deposited metal mechanical property of new slag system nickel-base welding rod of the present invention reaches：Yield strength：457MPa, tension Intensity：707MPa, percentage elongation 44%, when -196 DEG C, impact value is 78J, fully meets the welding requirements of 9Ni steel LNG ship storage tanks； Postwelding of the present invention forms the component and percentage by weight of deposited metal：C：≤ 0.05%, Mn：1.2～4.0%, Si：≤ 0.5%, Cr：12.0～16.0%, Mo：2.0～4.0%, Nb：0.5～2.0%, W：≤ 1.2%, P：≤ 0.015%, S：≤ 0.015%, Ni：>=60%, comply fully with the GB/T 13814ENi6620 standards and AWS of nickel and nickel, base alloy covered electrode A5.11ENiCrFe-9 standards.
Specific embodiment
Below embodiments of the invention are elaborated, following examples are given premised on technical solution of the present invention Detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following embodiments.
The invention provides a kind of LNG structures and 9 nickel steel peculiar to vessel welding are with new slag system nickel-base welding rod, it include core wire with And wrap in the coating on the core wire surface.The core wire uses pure nickel core wire, this is because pure nickel core wire source is wide, it is easy to plus Work, low price；The chemical composition and its weight percent content of the core wire be：C≤0.02%, S≤0.01%, P≤ 0.01%, Ni >=99.0%, remaining constituent content≤0.50%, each composition total amount are 100%.
In described coating, the composition and its weight percent content of powder is：Marble 5～15%, cryolite 14～ 23%th, rutile 5～10%, brium carbonate 5～10%, crome metal 22～28%, manganese metal 4～7%, molybdenum 5～8%, molybdenum-iron 3～ 8%th, ferrotungsten 2～4%, ferro-niobium 3～7%, Organic substance 0.5～1.5%, potassium titanate 0.5～1.5%, ferrosilicon 1～3%, ferrotianium 1 ～4%, each composition total amount is 100%.
In described coating, the mass percentage content of the main component of each powder reaches following requirement：In marble CaCO3Content >=96%；F content >=53% in cryolite, Na content≤31%, Al content >=13%；In ferro-niobium, Nb contents are 50～65%；In ferrotungsten, W content is 70～80%；Cr content >=99% in crome metal, Mn content >=99% in manganese metal；Metal Mo content >=99% in molybdenum；In molybdenum-iron, Mo contents are 55～65%, and in ferrotianium, Ti contents are 25～35%；In ferrosilicon, Si contents are 40～45%；BaCO in brium carbonate3Content >=98%；TiO in potassium titanate2Content >=70%, K2O content is 17～21%.
The powder of each composition is proportionally uniformly mixed, the quality 16%～35% for accounting for powder in the coating is added Waterglass uniformly mix, be then fed into conventionally being wrapped on the core wire in extrusion press, eventually pass low The new slag system nickel-based welding electrode is become after temperature is bakeed and high temperature is bakeed；Described waterglass is sodium silicate, potassium water Glass or potassium-sodium water glass, its Baume concentration are between 41 °～43 °；The temperature that described low temperature is bakeed is 100～150 DEG C； The temperature that high temperature is bakeed is 300～350 DEG C.
It is below three embodiments of powder Different Weight degree in the present invention.
In following 1#, 2# and 3# embodiment, electrode size is 3.2mm, except coating powder weight percent content not With outer, remaining technical characteristic all same.
The composition proportion (weight %) of 1 three embodiment electrode coating powder of table
The deposited metal composition (weight %) of 2 three embodiment welding rod of table
The deposited metal mechanical property of 3 three embodiment welding rod of table
Sequence number Yield strength (MPa) Tensile strength (MPa) Percentage elongation (%) Impact value (J-196℃)
1# 461 712 47 84
2# 454 704 43 75
3# 456 705 42 75
Meansigma methodss 457 707 44 78

Claims (4)

1. a kind of LNG structures and 9 nickel steel peculiar to vessel welding be with new slag system nickel-base welding rod, including core wire and wraps in core wire surface Coating, it is characterised in that：The chemical composition and its weight percent content of the core wire be：C≤0.02%, S≤0.01%, P ≤ 0.01%, Ni >=99.0%, remaining constituent content≤0.50%, each composition total amount are 100%；
In described coating, the composition and its weight percent content of powder is：Marble 5～15%, cryolite 14～23%, Rutile 5～10%, brium carbonate 5～10%, crome metal 22～28%, manganese metal 4～7%, molybdenum 5～8%, molybdenum-iron 3～8%, Ferrotungsten 2～4%, ferro-niobium 3～7%, Organic substance 0.5～1.5%, potassium titanate 0.5～1.5%, ferrosilicon 1～3%, ferrotianium 1～ 4%, each composition total amount is 100%；The powder of each composition is proportionally uniformly mixed, is added and is accounted for powder in the coating The waterglass of quality 16%～35% uniformly mixes, and is then fed into conventionally being wrapped in the core wire in extrusion press On, the new slag system nickel-base welding rod is become after eventually passing low temperature baking and high temperature baking.
2. LNG structures according to claim 1 and 9 nickel steel peculiar to vessel are welded with new slag system nickel-base welding rod, it is characterised in that： In described coating, the mass percentage content of the main component of each powder is as follows：CaCO in marble3Content >=96%；Ice crystal F content >=53% in stone, Na content≤31%, Al content >=13%；In ferro-niobium, Nb contents are 50～65%；W content in ferrotungsten For 70～80%；Cr content >=99% in crome metal, Mn content >=99% in manganese metal；Mo content >=99% in metal molybdenum；Molybdenum In ferrum, Mo contents are 55～65%, and in ferrotianium, Ti contents are 25～35%；In ferrosilicon, Si contents are 40～45%；In brium carbonate BaCO3Content >=98%；TiO in potassium titanate2Content >=70%, K2O content is 17～21%.
3. LNG structures according to claim 1 and 9 nickel steel peculiar to vessel are welded with new slag system nickel-base welding rod, it is characterised in that： Described waterglass is sodium silicate, KP1 or potassium-sodium water glass, and its Baume concentration is between 41 °～43 °.
4. LNG structures according to claim 1 and 9 nickel steel peculiar to vessel are welded with new slag system nickel-base welding rod, it is characterised in that： The temperature that described low temperature is bakeed is 100～150 DEG C；The temperature that high temperature is bakeed is 300～350 DEG C.
CN201510270814.1A 2015-05-25 2015-05-25 LNG structure and novel slag-system nickel-based welding rod for welding marine 9 nickel steel Expired - Fee Related CN104907730B (en)

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CN106514051A (en) * 2016-12-08 2017-03-22 河海大学常州校区 Underwater welding rod and manufacturing method thereof
CN106583965A (en) * 2016-12-15 2017-04-26 昆山京群焊材科技有限公司 High-strength and high-toughness flux-cored wire with low tempering parameter and used for 2.25Cr-1Mo steel
CN107214434B (en) * 2017-04-21 2019-10-29 洛阳双瑞特种合金材料有限公司 LNG structure and the nickel-base welding rod and preparation method thereof of 9Ni steel peculiar to vessel welding
CN109454357B (en) * 2018-11-28 2022-05-27 东莞理工学院 Nickel-based welding rod and preparation method thereof
CN112475661B (en) * 2021-02-04 2021-05-14 四川西冶新材料股份有限公司 Nickel-chromium-iron coating and welding rod for welding nickel-based alloy and preparation method thereof
CN113414519B (en) * 2021-08-06 2022-11-29 四川大西洋焊接材料股份有限公司 ENi6620 nickel-based welding rod for alternating current and preparation method and welding method thereof
CN116038176A (en) * 2022-11-30 2023-05-02 钢铁研究总院有限公司 Nickel-based welding rod with good low-temperature toughness for 9Ni steel manual arc welding

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