CN104959748A - Flux-cored wire special for maritime work low-temperature high-strength steel - Google Patents
Flux-cored wire special for maritime work low-temperature high-strength steel Download PDFInfo
- Publication number
- CN104959748A CN104959748A CN201510378935.8A CN201510378935A CN104959748A CN 104959748 A CN104959748 A CN 104959748A CN 201510378935 A CN201510378935 A CN 201510378935A CN 104959748 A CN104959748 A CN 104959748A
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- Prior art keywords
- cored wire
- flux
- temperature high
- strength steel
- low
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Classifications
-
- 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
-
- 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
- B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a flux-cored wire special for maritime work low-temperature high-strength steel. The flux-cored wire is composed of carbon steel skin and a flux core. The flux-cored wire comprises, by mass, 35%-40% of rutile, 2%-5% of magnesium oxide and/or calcium oxide, 0.5%-2% of zircon sand, 15%-25% of low-carbon ferromanganese, 4%-6% of magnesium fluoride, 2%-4% of aluminum magnesium alloy, 7%-10% of ferrosilicon, 5%-8% of ferrotitanium, 0.5%-2% of rare earth oxide, 9%-11% of nickel powder and the balance iron powder and inevitable impurities. The flux-cored wire does not contain boron (B) and has excellent welding technological performance. The comprehensive performance of deposited metal and welded joints is that the yield strength is larger than or equal to 470 MPa, the tensile strength is larger than or equal to 550 MPa, the elongation is larger than or equal to 22%, and KV2 is larger than or equal to 50 J when the temperature is -60DEG C.
Description
Technical field
The present invention relates to a kind of extra large work low-temperature high-strength steel flux-cored wire special.
Background technology
Flux-cored wire has good welding technological properties and welding efficiency, more and more application is obtained in the industry such as shipbuilding, ocean engineering, need to use low-temperature high-strength steel welding material in a large number in offshore oil drilling platform is built, especially need the flux-cored wire with favorable low-temperature impact toughness.Meanwhile, because offshore oil drilling platform employs a lot of large slab, good crack resistance is also required to welding material.
High-strength steel steel plate conventional in current drilling platforms and extra large work project mainly comprises A514, A517, EQ70, WELDOX700, EQ51, EQ63 etc., and corresponding welding material is the U.S. and gondola product.
CN101450426B discloses a kind of flux-cored, and its medicine core raw material comprises rutile, wollastonite, silicomangan, iron powder, nickel powder, ice crystal, feldspar, ferrotianium, ferro-boron, mid-carbon fe-mn, magnesia, quartz, fluorite.It is slant acidity slag system, and deposited metal-40 DEG C of low-temperature impact work mean values are 78J (joule).
CN103692110A discloses a kind of ocean engineering gas-shielded flux-cored wire; medicine core comprises rutile, fluoride, other slag former, strong deoxidier, weak deoxidier, alloying constituent; all the other are iron powder, wherein in alloying constituent at least containing the nickel powder accounting for medicine core gross mass 2 ~ 5%.This flux-cored wire yield strength grade is 375Mpa, and deposited metal low-temperature impact test temperature is-40 DEG C.
Most current gas shielded welding flux-cored wire usually can only meet-40 DEG C of low-temperature impact toughness requirements and yield strength lower than 470MPa.In order to meet low-temperature flexibility requirement, usually adopt titanium-boron (Ti-B) as alloy refinement element.And well-known, other conventional element relatively, boron (B) is larger to crack resistance harm, as cooling cracks the susceptible index number
Pcm＝C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B，
Wherein the coefficient of boron is the highest, reaches 5, and at P
`in the computing formula of cm, the coefficient of boron is more up to 23.Therefore, use during Ti-B refinement weld metal and need the strict content controlling boron, but reality is difficult to its content of stability contorting.
Summary of the invention
The technical problem to be solved in the present invention is the situation for welding material crack resistance is not good in prior art, low-temperature impact toughness is undesirable, there is provided a kind of and can meet-60 DEG C of impact flexibility requirements without adding boron (B) element mechanical property, and meet yield strength higher grade extra large work low-temperature high-strength steel flux-cored wire special.
Extra large work low-temperature high-strength steel flux-cored wire special provided by the invention, be made up of carbon steel crust and medicine core, by mass percentage, medicine core raw material composition comprises: rutile 35 ~ 40%; Magnesia and/or calcium oxide 2 ~ 5%; Zircon sand 0.5 ~ 2%; Low-carbon ferromanganese 15 ~ 25%; Magnesium fluoride 4 ~ 6%; Almag 2 ~ 4%; Ferrosilicon 7 ~ 10%; Ferrotianium 5 ~ 8%; Rare earth oxide 0.5 ~ 2%; Nickel powder 9 ~ 11%; Surplus is iron powder and inevitable impurity.
In the present invention, containing a large amount of rutile, can guarantee that there is good welds technique applicability.Take Al-Mg-Ti-Si-Mn combined deoxidation mode, Al, Mg, Ti, Si, Mn derive from almag, ferrotianium, ferrosilicon, low-carbon ferromanganese.Its principle is: the affinity of aluminium, magnesium, titanium, silicon, manganese and oxygen element is greater than iron, preferential and oxygen generation oxidation reaction, reduce the oxidation of iron, have part silicon simultaneously, manganese is transitioned in weld seam as alloying component, thus guarantees that weld metal yield strength can reach more than 470MPa.
In medicine core, rutile main component is TiO
2, play fluxing effect.When rutile is less than 35%, the operation of vertical position welding difficulty, shaping bad; Rutile more than 40% time, slag fusing point raise, appearance of weld be deteriorated.
Magnesia and/or calcium oxide are mainly used in regulating slag basicity.When alkali metal oxide is less than 2%, the effect of raising basicity is not remarkable; More than 5% time, slag fusing point uprises, slag assemble agglomerating, appearance of weld be deteriorated, during welding splash become greatly changeable.Magnesia and/or calcium oxide can reduce SiO in zircon sand
2activity, is conducive to ZrO in zircon sand
2as nucleating agent, impel acicular ferrite nucleating, thus improve weld metal impact flexibility.Zircon sand is less than 0.2%, ZrO
2content is low, and forming core effect is not obvious; Zircon sand is more than 2%, and need more polybase metal oxide to improve basicity, welding procedure is deteriorated.
Low-carbon ferromanganese refers to the manganeisen that phosphorus content is less than 0.7%, can participate in deoxidation, have alloying effect simultaneously.Medicine core medium-low carbon ferromanganese is less than 15%, and weld seam Mn content is low, is difficult to form acicular ferrite, and impact flexibility is low; Low-carbon ferromanganese is more than 25%, and weld seam Mn too high levels, easily forms martensite, improves tensile strength and reduces impact flexibility.
Magnesium fluoride (MgF
2) can dehydrogenation in welding, reduce weld hydrogen content, reduce the probability producing cold crack, when content is less than 4%, dehydrogenation is not obvious; More than 6% time, in welding process, molten drop becomes large, and splashing increases, and welding procedure is deteriorated.In addition, can MgO be formed after magnesium fluoride dehydrogenation, improve slag basicity further.
Almag is as deoxidier, and deoxidation products is Al
2o
3and MgO.Appropriate Al
2o
3can improve all-position welding operating procedure performance, MgO can improve slag basicity.Almag, as deoxidier, can make to form Ti in melt tank reaction
2o
3, impel acicular ferrite nucleating, thus improve weld seam impact toughness.
Ferrosilicon, ferrotianium, as deoxidier, have alloying effect simultaneously, guarantee that deposited metal yield strength grade meets 470MPa.When content is too much, yield strength is too high, and weld seam impact toughness declines, and then weld strength does not reach requirement very little.Ferrosilicon is the ferroalloy that silicon and iron form by a certain percentage, and directly can buy commercial goods, the trade mark has FeSi75, FeSi65, FeSi45 etc.The ferroalloy of ferrotianium to be titaniferous amount be 20% ~ 27% (mass percentage), directly can buy commercial goods, the trade mark has FeTi30, FeTi40 etc.
Rare earth oxide can crystal grain thinning, when content is less than 0.5%, acts on not obvious; More than 2%, weld metal Rare-Earth Content is too much, reduces impact flexibility on the contrary.
Nickel powder contains a large amount of Ni, uses as alloying agent.Weld seam contains appropriate Ni, can reduce brittle transition temperature, and low-temperature impact toughness is met the demands.
Do not add boron in above-mentioned medicine core formula, realize by the interaction between each specific consumption composition the requirement improving impact flexibility and anti-yield strength.
Preferably, the quality of described medicine core accounts for 13 ~ 17% of flux-cored wire gross mass.
Preferably, ZrO in described zircon sand
2mass percent more than 65%.Zircon sand main component is ZrO
2, SiO
2deng.Work as ZrO
2percent mass lower time, SiO
2higher Deng other component content, will slag basicity be reduced, weld seam impact toughness numerical value can be reduced.
Preferably, described magnesia and/or calcium oxide, be more than or equal to 2 with the mass ratio of zircon sand.Zircon sand main component ZrO
2, SiO
2be acidic oxide, magnesia and/or calcium oxide are basic anhydride.Magnesia and/or calcium oxide, affect the basicity of welding slag with the mass values of zircon sand, when ratio is more than or equal to 2, can guarantee that weld seam obtains good toughness.
Preferably, described magnesia is fused magnesite.In fused magnesite, content of MgO is high, and impurity content is low, and its compact structure, other is containing MgO material (as caustic-calcined magnesite) relatively, has good moisture resistivity, is conducive to obtaining the lower weld seam of diffusible hydrogen.
Preferably, the particle diameter of described zircon sand is less than 74 μm.Zircon sand fusing point is very high, can reach more than 2200 DEG C.When its granularity is greater than 74 μm, welding process is difficult to fusing, easily forms " pit " at face of weld.
The present invention also provides the welding method of above-mentioned arbitrary extra large work low-temperature high-strength steel flux-cored wire special, and welding condition is: protective gas CO
2, purity 99.95%; Welding current 230 ~ 240A; Weldingvoltage 26 ~ 27V; Speed of welding 28 ~ 32mm/min.
Compared with prior art, the present invention has following beneficial effect:
1, flux-cored wire of the present invention uses CO
2shielding gas, has excellent welding technological properties, deposited metal and welding point combination property: yield strength>=470MPa; Tensile strength>=550MPa; Percentage elongation>=22%; When-60 DEG C, KV
2>=50J.
2, flux-cored wire of the present invention does not add boron, and weld metal has good cold-crack resistance energy.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, and to make those skilled in the art the present invention may be better understood and can be implemented, but illustrated embodiment is not as a limitation of the invention.
Embodiment flux-cored wire formula is in table 1, and sheetmetal is SPCC steel band, adopts conventional flux-cored wire manufacturing process.
Wherein, the metal oxide of embodiment 1,3 is common magnesia, and rare earth oxide is yittrium oxide.Embodiment 2 is fused magnesite, and rare earth oxide is yittrium oxide.The metal oxide of embodiment 4 is calcium oxide, and rare earth oxide is lanthana, and the metal oxide of embodiment 5 ~ 9 is the mixture of magnesia and calcium oxide, and rare earth oxide is mishmetal; Wherein in embodiment 5,7 and 9, magnesia is electric capacity magnesia.In embodiment 4,5 and 9, zircon sand granularity is less than 200 orders (being less than 74 μm), wherein ZrO
2mass percent more than 65%.
Table 1 flux-cored wire formula (mass percent)
Table 2 is depicted as chemical composition and the mechanical property of embodiment flux-cored wire deposited metal.Welding condition: protective gas CO
2, purity 99.95%; Welding current 230 ~ 240A; Weldingvoltage 26 ~ 27V; Speed of welding is about 30mm/min.
The chemical composition of table 2 deposited metal and mechanical property
Can draw from the chemical composition of table 1 and table 2 illustrated embodiment: flux-cored wire of the present invention uses CO
2shielding gas, deposited metal and welding point combination property: yield strength>=470MPa; Tensile strength>=550MPa; Percentage elongation>=22%; Under-60 DEG C of conditions, Akv>=50J.
Table 3 is Y crazing-resistance test cracking breakout (%) tiltedly
| Numbering | Face crack rate | Root crack rate | Section crack rate |
| 1 | 0 | 0 | 0 |
| 2 | 0 | 0 | 0 |
| 3 | 0 | 0 | 0 |
| 4 | 0 | 0 | 0 |
| 5 | 0 | 1.5 | 1.7 |
| 6 | 0 | 0 | 0 |
| 7 | 0 | 3.2 | 2 |
| 8 | 0 | 0 | 0 |
| 9 | 0 | 2.1 | 1.3 |
Embodiment 1 ~ 9 has carried out oblique Y crazing-resistance test, and result of the test is in table 3, and display all has good anti-crack ability.
The above embodiment is only that protection scope of the present invention is not limited thereto in order to absolutely prove the preferred embodiment that the present invention lifts.The equivalent alternative or conversion that those skilled in the art do on basis of the present invention, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (7)
1. an extra large work low-temperature high-strength steel flux-cored wire special, is made up of carbon steel crust and medicine core, it is characterized in that, by mass percentage, medicine core raw material composition comprises: rutile 35 ~ 40%; Magnesia and/or calcium oxide 2 ~ 5%; Zircon sand 0.5 ~ 2%; Low-carbon ferromanganese 15 ~ 25%; Magnesium fluoride 4 ~ 6%; Almag 2 ~ 4%; Ferrosilicon 7 ~ 10%; Ferrotianium 5 ~ 8%; Rare earth oxide 0.5 ~ 2%; Nickel powder 9 ~ 11%; Surplus is iron powder and inevitable impurity.
2. extra large work low-temperature high-strength steel flux-cored wire special according to claim 1, it is characterized in that, the quality of described medicine core accounts for 13 ~ 17% of flux-cored wire gross mass.
3. extra large work low-temperature high-strength steel flux-cored wire special according to claim 1, is characterized in that, ZrO in described zircon sand
2mass percentage more than 65%.
4. extra large work low-temperature high-strength steel flux-cored wire special according to claim 1, is characterized in that described magnesia and/or calcium oxide are more than or equal to 2 with the mass ratio of zircon sand.
5., according to the arbitrary described extra large work low-temperature high-strength steel flux-cored wire special of Claims 1 to 4, it is characterized in that, described magnesia is fused magnesite.
6. extra large work low-temperature high-strength steel flux-cored wire special according to claim 5, it is characterized in that, the particle diameter of described zircon sand is less than 74 μm.
7. a welding method for the arbitrary described extra large work low-temperature high-strength steel flux-cored wire special of claim 1 ~ 6, it is characterized in that, welding condition is: protective gas CO
2, purity 99.95%; Welding current 230 ~ 240A; Weldingvoltage 26 ~ 27V; Speed of welding 28 ~ 32mm/min.
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|---|---|---|---|
| CN201510378935.8A CN104959748A (en) | 2015-07-02 | 2015-07-02 | Flux-cored wire special for maritime work low-temperature high-strength steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510378935.8A CN104959748A (en) | 2015-07-02 | 2015-07-02 | Flux-cored wire special for maritime work low-temperature high-strength steel |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728989A (en) * | 2016-04-12 | 2016-07-06 | 湘潭大学 | High-toughness atmosphere corrosion resistance flux-cored solder wire and preparation method thereof |
| CN106041362A (en) * | 2016-08-03 | 2016-10-26 | 武汉铁锚焊接材料股份有限公司 | Low-temperature steel flux-cored wire with nickel content being 1% or below |
| CN106041363A (en) * | 2016-08-03 | 2016-10-26 | 武汉铁锚焊接材料股份有限公司 | Flux-cored wire for low-temperature and ultra-high-strength steel |
| CN106141497A (en) * | 2016-08-03 | 2016-11-23 | 武汉铁锚焊接材料股份有限公司 | A kind of 685MPa grade super strength steel flux-cored wire |
| CN106624422A (en) * | 2016-12-15 | 2017-05-10 | 昆山京群焊材科技有限公司 | 56kg-grade flux-cored wire suitable for stress relief treatment after welding |
| CN108406159A (en) * | 2018-01-18 | 2018-08-17 | 洛阳双瑞特种合金材料有限公司 | A kind of high tenacity titanium alkaline seamless flux-cored wire suitable for all-position welding |
| CN109128585A (en) * | 2017-06-27 | 2019-01-04 | 宝山钢铁股份有限公司 | A kind of high heat-input electro-gas (enclosed) welding gas shielded flux cored wire based on microstructure homogenization mechanism |
| CN109175777A (en) * | 2018-10-23 | 2019-01-11 | 郑州大学 | A kind of mating flux-cored wire of 550MPa grade low-temp steel |
| CN109719427A (en) * | 2019-03-12 | 2019-05-07 | 江苏南通瑞舶莱焊业科技有限公司 | A kind of low temperature resistant steel flux-cored wire |
| CN110202290A (en) * | 2019-05-29 | 2019-09-06 | 武汉铁锚焊接材料股份有限公司 | A kind of high-strength weathering steel flux-cored wire and its application |
| CN111761253A (en) * | 2020-06-22 | 2020-10-13 | 中国船舶重工集团公司第七二五研究所 | Seamless flux-cored wire for all-position welding of austenite ultralow-temperature steel and preparation method thereof |
| CN112453756A (en) * | 2020-11-19 | 2021-03-09 | 天津大桥金属焊丝有限公司 | High-strength and high-toughness gas-shielded flux-cored wire |
| CN112917044A (en) * | 2021-02-03 | 2021-06-08 | 武汉铁锚焊接材料股份有限公司 | 550 MPa-level flux-cored wire with excellent moisture resistance |
| CN118106660A (en) * | 2024-04-30 | 2024-05-31 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Manufacturing method of 460 MPa-level steel flux-cored wire for ships and maritime work |
| CN118106660B (en) * | 2024-04-30 | 2024-07-05 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Manufacturing method of 460 MPa-level steel flux-cored wire for ships and maritime work |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105728989B (en) * | 2016-04-12 | 2017-01-11 | 湘潭大学 | High-toughness atmosphere corrosion resistance flux-cored solder wire and preparation method thereof |
| CN105728989A (en) * | 2016-04-12 | 2016-07-06 | 湘潭大学 | High-toughness atmosphere corrosion resistance flux-cored solder wire and preparation method thereof |
| CN106041362B (en) * | 2016-08-03 | 2018-08-17 | 武汉铁锚焊接材料股份有限公司 | A kind of nickel content is flux-cored less than 1% |
| CN106041362A (en) * | 2016-08-03 | 2016-10-26 | 武汉铁锚焊接材料股份有限公司 | Low-temperature steel flux-cored wire with nickel content being 1% or below |
| CN106041363A (en) * | 2016-08-03 | 2016-10-26 | 武汉铁锚焊接材料股份有限公司 | Flux-cored wire for low-temperature and ultra-high-strength steel |
| CN106141497A (en) * | 2016-08-03 | 2016-11-23 | 武汉铁锚焊接材料股份有限公司 | A kind of 685MPa grade super strength steel flux-cored wire |
| CN106041363B (en) * | 2016-08-03 | 2019-02-12 | 武汉铁锚焊接材料股份有限公司 | A kind of low temperature unimach flux-cored wire |
| CN106624422A (en) * | 2016-12-15 | 2017-05-10 | 昆山京群焊材科技有限公司 | 56kg-grade flux-cored wire suitable for stress relief treatment after welding |
| CN109128585A (en) * | 2017-06-27 | 2019-01-04 | 宝山钢铁股份有限公司 | A kind of high heat-input electro-gas (enclosed) welding gas shielded flux cored wire based on microstructure homogenization mechanism |
| CN108406159A (en) * | 2018-01-18 | 2018-08-17 | 洛阳双瑞特种合金材料有限公司 | A kind of high tenacity titanium alkaline seamless flux-cored wire suitable for all-position welding |
| CN108406159B (en) * | 2018-01-18 | 2020-06-30 | 洛阳双瑞特种合金材料有限公司 | High-toughness titanium-alkali seamless flux-cored wire suitable for all-position welding |
| CN109175777A (en) * | 2018-10-23 | 2019-01-11 | 郑州大学 | A kind of mating flux-cored wire of 550MPa grade low-temp steel |
| CN109719427A (en) * | 2019-03-12 | 2019-05-07 | 江苏南通瑞舶莱焊业科技有限公司 | A kind of low temperature resistant steel flux-cored wire |
| CN110202290A (en) * | 2019-05-29 | 2019-09-06 | 武汉铁锚焊接材料股份有限公司 | A kind of high-strength weathering steel flux-cored wire and its application |
| CN111761253A (en) * | 2020-06-22 | 2020-10-13 | 中国船舶重工集团公司第七二五研究所 | Seamless flux-cored wire for all-position welding of austenite ultralow-temperature steel and preparation method thereof |
| CN111761253B (en) * | 2020-06-22 | 2022-04-19 | 中国船舶重工集团公司第七二五研究所 | Seamless flux-cored wire for all-position welding of austenite ultralow-temperature steel and preparation method thereof |
| CN112453756A (en) * | 2020-11-19 | 2021-03-09 | 天津大桥金属焊丝有限公司 | High-strength and high-toughness gas-shielded flux-cored wire |
| CN112917044A (en) * | 2021-02-03 | 2021-06-08 | 武汉铁锚焊接材料股份有限公司 | 550 MPa-level flux-cored wire with excellent moisture resistance |
| CN112917044B (en) * | 2021-02-03 | 2022-09-06 | 武汉铁锚焊接材料股份有限公司 | 550 MPa-level flux-cored wire with excellent moisture resistance |
| CN118106660A (en) * | 2024-04-30 | 2024-05-31 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Manufacturing method of 460 MPa-level steel flux-cored wire for ships and maritime work |
| CN118106660B (en) * | 2024-04-30 | 2024-07-05 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Manufacturing method of 460 MPa-level steel flux-cored wire for ships and maritime work |
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Application publication date: 20151007 |