CN110605497A - Marine seamless submerged arc flux-cored wire of LPG - Google Patents
Marine seamless submerged arc flux-cored wire of LPG Download PDFInfo
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- CN110605497A CN110605497A CN201910893371.XA CN201910893371A CN110605497A CN 110605497 A CN110605497 A CN 110605497A CN 201910893371 A CN201910893371 A CN 201910893371A CN 110605497 A CN110605497 A CN 110605497A
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- flux
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- cored
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- cored wire
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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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- 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
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The seamless submerged arc flux-cored wire for the LPG ship comprises a steel outer skin and flux-cored powder, wherein the flux-cored powder comprises the following components in percentage by mass: 0.5-1.5% of ferrosilicon, 5-10% of metal manganese, 15-25% of metal nickel, 0.5-2% of metal chromium, 1.5-3% of titanium powder, 0.2-0.5% of ferroboron, 0.5-1% of magnesium powder, 0.2-0.6% of rare earth and the balance of iron powder and inevitable impurities. The seamless flux-cored wire prepared by the flux-cored powder mixture ratio has stable deposited metal mechanical property, the strength is more than 600MPa, the impact energy at minus 75 ℃ is more than 100J, the deposited metal diffusible hydrogen is less than 4ml/100g, the moisture absorption resistance is good, and the use requirement of submerged arc welding of a low-temperature steel LPG ship is met.
Description
Technical Field
The invention belongs to the technical field of welding materials, and particularly relates to a seamless submerged arc flux-cored wire for an LPG ship.
Background
With the increasing national demand for energy and the increasing environmental protection, liquefied petroleum gas (LPG for short) is widely used in many fields as a relatively cheap and clean fossil energy. The LPG is often produced at a remote location from the demand location and is generally transported by liquefaction and, basically, by LPG ships at sea. As the working environment of the LPG ship can reach-40 ℃ to-60 ℃, higher requirements are put forward on the low-temperature toughness of steel plates and welding materials for the LPG ship. At present, the low-temperature steel plate for the LPG ship is developed by Bao steel, and the welding material for the LPG ship still depends on import.
The prior art mainly has the following three welding wires: (1) the flux-cored wire for the low-temperature steel is a seamed flux-cored wire, is easy to absorb moisture to cause the content of diffused hydrogen to exceed the standard, and has larger difference of the components of the flux-cored powder; (2) the flux-cored wire for the submerged-arc welding of the low-temperature steel is a seamed flux-cored wire, has larger difference of alloy components than the flux-cored wire, contains more noble metal molybdenum, and has an average value of impact power of deposited metal of the flux-cored wire at-60 ℃ of not less than 47J; (3) the seamless explosive core powder for welding LPG ship contains expensive alloy powder of ferromolybdenum and the like, and has a formula which is different from that of the explosive core powder. Therefore, the low-temperature steel flux-cored wires and the flux-cored powder formulas thereof have the defects.
Disclosure of Invention
In order to solve the problems, the invention provides a seamless submerged arc flux-cored wire for an LPG ship.
The technical scheme of the invention is as follows: the seamless submerged arc flux-cored wire for the LPG ship comprises flux-cored powder and a low-carbon steel belt wrapping the flux-cored powder, wherein the flux-cored powder comprises the following components in percentage by weight: 0.5-1.5% of ferrosilicon, 5-10% of metal manganese, 15-25% of metal nickel, 0.5-2% of metal chromium, 1.5-3% of titanium powder, 0.2-0.5% of ferroboron, 0.5-1% of magnesium powder, 0.2-0.6% of rare earth and the balance of iron powder and inevitable impurities, wherein the filling weight of the powder core accounts for 10-15% of the total weight of the welding wire.
Further optimization, the grain diameter of the medicine core powder is not more than 60 meshes.
And further optimizing, wherein the low-carbon steel strip is an SPCC steel strip.
Further optimizing, the ferrosilicon is FeSi45, and the ferrosilicon comprises the following elements in percentage by mass: 43 to 47 percent of Si, less than or equal to 0.20 percent of C, less than or equal to 0.02 percent of S and less than or equal to 0.04 percent of P.
Further optimizing, the ferroboron comprises the following elements in percentage by mass: 19 to 21 percent of B, less than or equal to 0.5 percent of C, less than or equal to 0.01 percent of S and less than or equal to 0.1 percent of P.
Further optimized, the rare earth is added in the form of cerium fluoride.
The seamless submerged arc flux-cored wire is further optimized, and is prepared by cleaning a steel strip, rolling the steel strip into a U shape through a forming unit, adding the powder of the flux core after screening, drying and mixing the components on line, rolling the steel strip added with the powder of the flux core into an O shape, and performing welding, high-temperature annealing and reducing.
The invention has the beneficial effects that:
1. the components of the medicine core powder respectively play the following roles:
silicon iron and silicon are good deoxidizers and solid solution strengthening elements, the proper silicon content can improve the fluidity of molten iron and improve the weld forming, but the too high silicon content can reduce the plasticity and toughness of weld metal;
the manganese metal has good deoxidation and desulfurization effects, and can effectively improve the strength of the weld metal, but the excessive manganese content can cause coarsening of crystal grains and reduce the toughness of the weld metal;
the nickel can improve the strength and the plasticity of the material, promote the formation of acicular ferrite, improve the toughness of weld metal, reduce the ductile-brittle transition temperature, control the addition range of the nickel within 15-25 percent, and effectively reduce the production cost of the welding material;
the metal chromium is a solid solution strengthening element, can improve the strength of the material, and in order to ensure that the weld metal obtains higher strength and good low-temperature toughness, the components of the flux core are added with metal nickel, titanium powder, ferroboron, rare earth and magnesium powder to improve the toughness of the weld metal, wherein the titanium powder is a strong deoxidizer and is also a strong nitrogen compound forming element, titanium, oxygen and nitrogen form titanium oxide and nitride, the titanium, the oxygen and the nitrogen are used as nucleation centers during solid phase change to promote the formation of acicular ferrite, and meanwhile, the structure is refined, and the toughness of the weld metal is improved; ferroboron, boron segregates in austenite grain boundary, inhibits the formation of proeutectoid ferrite, strengthens grain boundary, improves toughness, and can obviously improve low-temperature impact toughness when being added with titanium; the rare earth is added in the form of cerium fluoride, cerium is used as a rare earth element and can interact with alloy and elements, the structure and distribution of a welding seam and the shape and distribution of impurities are improved, the toughness of the welding seam is improved, and meanwhile, fluorine in the cerium fluoride can be combined with hydrogen in an electric arc reaction zone to generate hydrogen fluoride gas to play a role in dehydrogenation; magnesium is used as a deoxidizer, a deoxidation product is MgO, the basicity of slag can be improved, the nitrogen content of a weld joint can be reduced, and the toughness is further improved on the basis of toughening by cerium fluoride;
2. the seamless submerged arc flux-cored wire for the LPG ship provided by the invention has low alloy component content, does not contain Mo, realizes low-temperature toughness by adopting a Ti and B micro-alloying method, and simultaneously has good moisture absorption resistance and low content of deposited metal diffusion hydrogen compared with the common flux-cored wire;
3. the seamless submerged arc flux-cored wire for LPG ship deposited metal provided by the invention has stable mechanical property and proper strength, the elongation is not less than 21%, and the impact energy at-75 ℃ is more than 100J;
4. the seamless submerged arc flux-cored wire for the LPG ship, provided by the invention, is matched with a sintered flux, and has the advantages of stable welding arc, small splashing, good spreadability and fusion property, attractive welding line formation and easy slag removal.
Detailed Description
The specific implementation mode of the invention is as follows:
example 1
The seamless submerged arc flux-cored wire for the LPG ship comprises an SPCC steel belt outer skin and flux-cored powder, wherein the flux-cored powder comprises the following components in percentage by weight: 1.4 percent of ferrosilicon, 10 percent of metal manganese, 24 percent of metal nickel, 0.6 percent of metal chromium, 2.4 percent of titanium powder, 0.4 percent of ferroboron, 0.6 percent of magnesium powder, 0.3 percent of cerium fluoride and 60.3 percent of iron powder.
The preparation method comprises the following steps: screening and drying the components of the raw materials, uniformly mixing the components according to the proportion to obtain the powder core powder, rolling the cleaned SPCC steel strip into a U shape by using a forming roller, adding the powder core powder into a U-shaped groove according to 10 percent of the total weight of the welding wire by using a powder feeding device, rolling the steel strip into an O shape, welding on line, annealing at high temperature and reducing, wherein the diameter of the finished seamless flux-cored wire can be reduced to 3.2mm or 4.0mm according to the requirement.
Example 2
The seamless submerged arc flux-cored wire for the LPG ship comprises an SPCC steel belt outer skin and flux-cored powder, wherein the flux-cored powder comprises the following components in percentage by weight: 0.7 percent of ferrosilicon, 6 percent of manganese metal, 18 percent of nickel metal, 1.2 percent of chromium metal, 1.8 percent of titanium powder, 0.3 percent of ferroboron, 0.8 percent of magnesium powder, 0.5 percent of cerium fluoride and 70.7 percent of iron powder.
The preparation method comprises the following steps: screening and drying the components, and uniformly mixing the components according to the proportion to obtain medicine core powder; rolling the cleaned SPCC steel strip into a U shape by using a forming roller, and then adding the flux-cored powder into a U-shaped groove by a powder feeding device according to 15 percent of the total weight of the welding wire; and rolling the steel strip into an O shape, and performing on-line welding, high-temperature annealing and reducing, wherein the diameter of the finished seamless flux-cored wire can be reduced to 3.2mm or 4.0mm according to requirements.
Example 3
The chemical composition requirements of each component of the welding wire powder obtained in examples 1-2 are shown in Table 1.
TABLE 1 chemical composition requirements of the main raw materials
TABLE 2 mechanical Properties of deposited metal by seamless flux-cored wire
TABLE 3 content of diffusible hydrogen in deposited metal of seamless flux-cored wire
The prepared seamless flux-cored wire is matched with CaF with the alkalinity of 2.5-3.22-MgO-SiO2-Al2O3The slag system sintered flux is welded according to the following process parameters: the welding current is 400-450A, the welding voltage is 30-32V, the welding speed is 40-45cm/min, and the inter-channel temperature is controlled at 100-150 ℃. The mechanical property of the welding deposited metal is detected, the content of diffusible hydrogen in the welding deposited metal is measured according to GB/T3965-.
The foregoing illustrates and describes the principal features, utilities, and principles of the invention, as well as advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The seamless submerged arc flux-cored wire for the LPG ship comprises flux-cored powder and a low-carbon steel belt wrapping the flux-cored powder, and is characterized in that the flux-cored powder comprises the following components in percentage by weight: 0.5-1.5% of ferrosilicon, 5-10% of metal manganese, 15-25% of metal nickel, 0.5-2% of metal chromium, 1.5-3% of titanium powder, 0.2-0.5% of ferroboron, 0.5-1% of magnesium powder, 0.2-0.6% of rare earth and the balance of iron powder and inevitable impurities, wherein the filling weight of the powder core accounts for 10-15% of the total weight of the welding wire.
2. The seamless submerged arc flux-cored wire for LPG ships as claimed in claim 1, wherein the grain size of the flux-cored powder is not greater than 60 meshes.
3. The seamless submerged arc flux-cored wire for LPG ships as set forth in claim 1, wherein the low carbon steel strip is an SPCC steel strip.
4. The seamless submerged arc flux-cored wire for the LPG ship as claimed in claim 1, wherein the silicon iron is FeSi45, and the silicon iron comprises the following elements in percentage by mass: 43 to 47 percent of Si, less than or equal to 0.20 percent of C, less than or equal to 0.02 percent of S and less than or equal to 0.04 percent of P.
5. The seamless submerged arc flux-cored wire for the LPG ship as claimed in claim 1, wherein the ferroboron comprises the following elements in percentage by mass: 19 to 21 percent of B, less than or equal to 0.5 percent of C, less than or equal to 0.01 percent of S and less than or equal to 0.1 percent of P.
6. The seamless submerged arc flux-cored wire for LPG ships as claimed in claim 1, wherein the rare earth is added in the form of cerium fluoride.
7. The seamless submerged arc flux-cored wire for the LPG ship as claimed in claim 1, wherein the flux-cored wire is prepared by cleaning a steel strip, rolling the steel strip into a U shape by a forming machine set, adding the powder of the flux core after screening, drying and mixing the components, rolling the steel strip added with the powder of the flux core into an O shape, and performing welding, high-temperature annealing and reducing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910893371.XA CN110605497A (en) | 2019-09-20 | 2019-09-20 | Marine seamless submerged arc flux-cored wire of LPG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910893371.XA CN110605497A (en) | 2019-09-20 | 2019-09-20 | Marine seamless submerged arc flux-cored wire of LPG |
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| Publication Number | Publication Date |
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| CN110605497A true CN110605497A (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910893371.XA Pending CN110605497A (en) | 2019-09-20 | 2019-09-20 | Marine seamless submerged arc flux-cored wire of LPG |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114055013A (en) * | 2021-11-26 | 2022-02-18 | 四川大西洋焊接材料股份有限公司 | Flux-cored wire, flux-cored wire and preparation method and application thereof |
| CN115647650A (en) * | 2022-11-04 | 2023-01-31 | 哈尔滨威尔焊接有限责任公司 | Low-temperature high-manganese steel submerged arc transverse welding wire and flux for LNG ship, preparation method of welding wire and welding method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2289661A1 (en) * | 2009-08-27 | 2011-03-02 | Nippon Steel & Sumikin Welding Co., Ltd. | Flux cored wire for gas shielded arc welding of high strength steel |
| CN106141500A (en) * | 2016-08-10 | 2016-11-23 | 中国船舶重工集团公司第七二五研究所 | A kind of yield strength 690MPa level steel ultralow-hydrogen low seamless submerged arc flux-cored wire |
| CN109822258A (en) * | 2019-01-23 | 2019-05-31 | 洛阳双瑞特种合金材料有限公司 | A kind of low-temperature steel LPG ship flux-cored wire used for submerged arc welding |
-
2019
- 2019-09-20 CN CN201910893371.XA patent/CN110605497A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2289661A1 (en) * | 2009-08-27 | 2011-03-02 | Nippon Steel & Sumikin Welding Co., Ltd. | Flux cored wire for gas shielded arc welding of high strength steel |
| CN106141500A (en) * | 2016-08-10 | 2016-11-23 | 中国船舶重工集团公司第七二五研究所 | A kind of yield strength 690MPa level steel ultralow-hydrogen low seamless submerged arc flux-cored wire |
| CN109822258A (en) * | 2019-01-23 | 2019-05-31 | 洛阳双瑞特种合金材料有限公司 | A kind of low-temperature steel LPG ship flux-cored wire used for submerged arc welding |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114055013A (en) * | 2021-11-26 | 2022-02-18 | 四川大西洋焊接材料股份有限公司 | Flux-cored wire, flux-cored wire and preparation method and application thereof |
| CN115647650A (en) * | 2022-11-04 | 2023-01-31 | 哈尔滨威尔焊接有限责任公司 | Low-temperature high-manganese steel submerged arc transverse welding wire and flux for LNG ship, preparation method of welding wire and welding method |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20200714 Address after: 471000 No. 169 Binhe South Road, Luolong District, Henan, Luoyang Applicant after: CHINA SHIPBUILDING INDUSTRY CORPORATION NO.725 Research Institute Applicant after: LUOYANG SHUANGRUI SPEICAL ALLOY MATERIAL CO.,LTD. Address before: 471000 Henan Province, Luoyang city high tech Development Zone No. 20 road extension Applicant before: LUOYANG SHUANGRUI SPEICAL ALLOY MATERIAL Co.,Ltd. |
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Effective date of registration: 20210127 Address after: No. 169, Binhe South Road, Luolong District, Luoyang City, Henan Province Applicant after: CHINA SHIPBUILDING INDUSTRY CORPORATION NO.725 Research Institute Address before: No. 169, Binhe South Road, Luolong District, Luoyang City, Henan Province Applicant before: CHINA SHIPBUILDING INDUSTRY CORPORATION NO.725 Research Institute Applicant before: LUOYANG SHUANGRUI SPEICAL ALLOY MATERIAL Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191224 |
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