CN107252996B - Titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel - Google Patents
Titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel Download PDFInfo
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- CN107252996B CN107252996B CN201710487427.2A CN201710487427A CN107252996B CN 107252996 B CN107252996 B CN 107252996B CN 201710487427 A CN201710487427 A CN 201710487427A CN 107252996 B CN107252996 B CN 107252996B
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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
Abstract
The invention provides a titanium type gas protection flux-cored wire for marine atmospheric corrosion resistant steel, which comprises, by weight, 550 parts of rutile 250-doped iron, 10-50 parts of quartz, 5-40 parts of sodium fluoride, 1-10 parts of rare earth fluoride, 15-60 parts of a potassium-sodium arc stabilizer, 50-150 parts of a silicon-manganese alloy, 10-50 parts of metal manganese, 20-60 parts of magnesium powder, 330 parts of nickel powder 130-doped iron, 2-20 parts of molybdenum powder, 10-60 parts of copper powder, 10-60 parts of ferrotitanium, and 250 parts of 100-doped iron powder. The titanium type gas-shielded flux-cored wire for the marine atmospheric corrosion resistant steel achieves the marine atmospheric corrosion resistant effect and avoids the coating process.
Description
Technical Field
The invention belongs to the field of welding materials, and particularly relates to a gas-shielded flux-cored wire for corrosion-resistant steel.
Background
The coating-free weather-resistant steel bridge has the comprehensive advantages of environmental protection, low maintenance cost and long service life. The weather-resistant steel bridges in developed countries are developed earlier, and the total number of the weather-resistant steel bridges in the United states accounts for more than 50 percent of the total number of the steel bridges; about 90% of steel bridges in Canada are made of weathering steel, and the proportion of Japanese weathering steel bridges is about 20%. But the practical engineering application of the weather-resistant steel bridge in China just starts.
And the corrosion resistance index (I) is the corrosion resistance index of the steel in the conventional industrial atmospheric environment. However, the major economically developed cities in China are in coastal areas, and the flux-cored wire which only meets the corrosion resistance index (I) cannot meet the requirements. Therefore, in the marine atmospheric environment, the marine atmospheric corrosion resistance of the weathering steel bridge is more important, and a new weathering resistance total index (V) is also required to evaluate the corrosion resistance.
Disclosure of Invention
In view of the above, the invention aims to provide a titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel, so as to achieve the marine atmospheric corrosion resistant effect and avoid a coating process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel comprises a flux core and a sheath;
the flux core comprises, by weight, 250-550 parts of rutile, 10-50 parts of quartz, 5-40 parts of sodium fluoride, 1-10 parts of rare earth fluoride, 15-60 parts of a potassium-sodium arc stabilizer, 50-150 parts of a silicon-manganese alloy, 10-50 parts of metal manganese, 20-60 parts of magnesium powder, 330 parts of nickel powder 130, 2-20 parts of molybdenum powder, 10-60 parts of copper powder, 10-60 parts of ferrotitanium, and 250 parts of 100-one iron powder.
Preferably, the flux core comprises the following components, by weight, 500 parts of rutile 300-containing material, 12-30 parts of quartz, 15-30 parts of sodium fluoride, 5-9 parts of rare earth fluoride, 20-45 parts of potassium-sodium arc stabilizer, 78-120 parts of silicon-manganese alloy, 18-42 parts of manganese metal, 30-60 parts of magnesium powder, 330 parts of nickel powder 130-containing material, 2-18 parts of molybdenum powder, 15-60 parts of copper powder, 20-50 parts of ferrotitanium, and 230 parts of iron powder 120-containing material.
Preferably, the content of the deposited metal component satisfies a weather resistance total index V.gtoreq.1.6, wherein
V＝1/{(1.0-0.16[C])×(1.05-0.05[Si])×(1.04-0.016[Mn])
×(1.0-0.5[P])×(1.0+1.9[S])×(1.0-0.10[Cu])
×(1.0-0.12[Ni])×(1.0-0.3[Mo])×(1.0-1.7[Ti])}；
Wherein [ C ], [ Si ], [ Mn ], [ P ], [ S ], [ Cu ], [ Ni ], [ Mo ] and [ Ti ] represent deposited metal content percentages of C, Si, Mn, P, S, Cu, Ni, Mo and Ti, respectively.
Preferably, said rutile is TiO2The purity of the product is more than or equal to 95 percent; SiO in quartz2The mass fraction of the component (A) is more than or equal to 98 percent.
Preferably, the nickel powder contains nickel with the mass fraction more than or equal to 99.5 percent; the molybdenum powder contains molybdenum with the mass fraction of more than or equal to 99.5 percent; the copper powder contains copper with the mass fraction more than or equal to 99.5 percent.
Preferably, the flux core accounts for 12-20% of the total mass of the welding wire.
Preferably, the outer skin takes the SPCC-SD cold-rolled low-carbon steel strip as a raw material.
Preferably, the method for evaluating the performance of the titanium type gas-shielded flux-cored wire for the marine atmospheric corrosion resistant steel adopts the weather resistance total index as a measurement index.
The following is a description of the function and content range of each component constituting the medicinal powder of the present invention.
Rutile: hair brushTiO in rutile used in Ming dynasty2The content is more than or equal to 95 percent. The flux-cored wire mainly plays a role of a slag former, the viscosity of welding slag is increased along with the increase of the rutile content, so that the welding wire can carry out all-position welding, and the slag removal performance of the flux-cored wire is gradually improved; however, when the amount of the slag increases to a certain extent, the fluidity of the slag is deteriorated.
Quartz: SiO in quartz used in the invention2The content is more than or equal to 98 percent. The invention can be used as slag former to improve the viscosity of slag and improve the welding manufacturability in vertical direction.
Rare earth fluoride: fluorine has the dehydrogenation function, but the splashing phenomenon is obvious when the content is too high; the rare earth elements in the alloy have the function of refining grains so as to improve impact toughness, but the addition of the rare earth elements is too high, so that the drop transition is slowed down, and the welding manufacturability is influenced.
Nickel powder: nickel is the main alloying element that ensures the corrosion resistance of deposited metals. The nickel can reduce the ductile-brittle transition temperature of weld metal, the strength is improved to a certain extent along with the increase of the nickel under a certain condition, the low-temperature impact toughness is obviously improved, and meanwhile, the nickel has higher corrosion resistance to acid and alkali and has antirust and heat resistance at high temperature; the increase of the nickel content has obvious effect on increasing the total weather resistance index, can effectively improve the corrosion resistance of the steel plate, but the too high Ni content can increase the hot cracking tendency of deposited metal.
Copper powder: copper can improve the atmospheric corrosion resistance of deposited metal and has the defect that hot brittleness is easy to generate during hot processing; copper is also a main element in the weather-resistant alloy index, and has an obvious effect of improving the corrosion resistance of the steel plate.
Molybdenum powder: molybdenum can improve the corrosion resistance of deposited metal, especially the corrosion resistance of marine climate; crystal grains can be refined, and the strength and the hardenability are improved; however, too high a content of molybdenum deteriorates toughness.
Silicon-manganese alloy: the main deoxidizer can reduce the oxygen content of the weld metal. When the addition amount is too small, deoxidation becomes poor, and impact toughness becomes poor; if the amount of the additive is too high, the strength is too high and the impact toughness is lowered.
Compared with the prior art, the titanium type gas shielded flux-cored wire for the marine atmospheric corrosion resistant steel has the following advantages:
the tensile strength of deposited metal of the flux-cored wire is more than or equal to 500MPa, the yield strength is more than or equal to 400MPa, the elongation is more than or equal to 22 percent, the impact toughness at minus 40 ℃ is more than or equal to 80J, and the content of diffusible hydrogen in the deposited metal is less than or equal to 5ml/100 g;
the weather resistance total index V is more than or equal to 1.6;
the coating has good crack resistance and marine atmospheric corrosion resistance, so that the marine atmospheric corrosion resistant bridge can avoid a coating process and has the advantage of environmental protection;
and the regular maintenance cost can be reduced, and the comprehensive cost is low.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The titanium type gas protection flux-cored wire for the marine atmospheric corrosion resistant steel is manufactured by taking an SPCC-SD cold-rolled low-carbon steel strip as a wire sheath and adopting a conventional flux-cored transition alloy mode, a general powder specification and a flux-cored wire production process.
The nickel powder contains nickel with the mass fraction more than or equal to 99.5 percent; the molybdenum powder contains molybdenum with the mass fraction of more than or equal to 99.5 percent; the copper powder contains copper with the mass fraction more than or equal to 99.5 percent.
Example 1
A titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel comprises a flux core and a sheath; the flux core accounts for 19.1% of the total mass of the welding wire.
The flux core comprises, by weight, 287 parts of rutile, 15 parts of quartz, 9 parts of sodium fluoride, 2 parts of rare earth fluoride, 20 parts of a potassium-sodium arc stabilizer, 62 parts of a silicon-manganese alloy, 15 parts of manganese metal, 25 parts of magnesium powder, 140 parts of nickel powder, 4 parts of molybdenum powder, 22 parts of copper powder, 16 parts of ferrotitanium and 230 parts of iron powder.
The experimental results are as follows:
tensile strength (Rm) 580 MPa; yield strength: 490 MPa; the elongation (A%) is 27.0%; impact toughness (test temperature-40 deg.C, KV2): 138J; the content of diffusible hydrogen in deposited metal is 4.4ml/100 g; the weather-resistant alloy index V is 1.86.
Example 2
A titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel comprises a flux core and a sheath, wherein the flux core accounts for 17.0% of the total mass of the wire;
the flux core comprises, by weight, 360 parts of rutile, 25 parts of quartz, 18 parts of sodium fluoride, 4 parts of rare earth fluoride, 32 parts of a potassium-sodium arc stabilizer, 87 parts of a silicon-manganese alloy, 25 parts of metal manganese, 35 parts of magnesium powder, 200 parts of nickel powder, 8 parts of molybdenum powder, 29 parts of copper powder, 29 parts of ferrotitanium and 194 parts of iron powder.
The experimental results are as follows:
tensile strength (Rm) 601 MPa; yield strength: 515 MPa; the elongation (A%) is 25.5%; impact toughness (test temperature-40 deg.C, KV2): 131J; the content of diffusible hydrogen in deposited metal is 4.1ml/100 g; the weather resistant alloy index V is 1.81.
Example 3
A titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel comprises a flux core and a sheath, wherein the flux core accounts for 15.1% of the total mass of the wire;
the flux core comprises 438 parts of rutile, 35 parts of quartz, 27 parts of sodium fluoride, 7 parts of rare earth fluoride, 43 parts of a potassium-sodium arc stabilizer, 112 parts of a silicon-manganese alloy, 35 parts of metal manganese, 45 parts of magnesium powder, 250 parts of nickel powder, 9 parts of molybdenum powder, 41 parts of copper powder, 41 parts of ferrotitanium and 156 parts of iron powder.
The experimental results are as follows:
tensile strength (Rm) 589 MPa; yield strength: 507 MPa; the elongation (A%) is 26.5%; impact toughness (test temperature-40 deg.C, KV2): 145J; the content of diffusible hydrogen in deposited metal is 3.7ml/100 g; the weather resistant alloy index V is 1.75.
Example 4
A titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel comprises a flux core and a sheath, wherein the flux core accounts for 12.9% of the total mass of the wire;
the flux core comprises, by weight, 512 parts of rutile, 45 parts of quartz, 36 parts of sodium fluoride, 9 parts of rare earth fluoride, 54 parts of a potassium-sodium arc stabilizer, 138 parts of a silicon-manganese alloy, 45 parts of metal manganese, 55 parts of magnesium powder, 310 parts of nickel powder, 15 parts of molybdenum powder, 54 parts of copper powder, 55 parts of ferrotitanium and 119 parts of iron powder.
The experimental results are as follows:
a tensile strength (Rm) of 599 MPa; yield strength: 513 MPa; the elongation (A%) is 25.0%; impact toughness (test temperature-40 deg.C, KV2): 126J; the content of diffusible hydrogen in deposited metal is 4.0ml/100 g; the weather resistant alloy index V is 1.67.
Performance verification test: simulation of galvanic corrosion research of base metal and welding material in atmospheric environment
1 test
(1) Electrochemical test device
The electrochemical test device adopts a three-electrode system. The working electrode (research electrode) is a sample to be tested, and the working area is 1cm2(ii) a The reference electrode is a saturated calomel electrode; the auxiliary electrode is a platinum wire mesh.
(2) Electrolyte and environmental conditions
Test temperature: 25 ℃ plus or minus 1 ℃.
The test conditions are as follows: simulating marine atmospheric environment, 0.5% NaCl solution;
simulating industrial atmospheric environment, 0.01mol/L NaHSO3And (3) solution.
(3) Instrumentation and equipment
The apparatus was a M398 electrochemical test system manufactured by EG & G, USA.
(4) Test specimen
The test sample is 3Ni weather-resistant bridge steel produced by saddle steel and comprises three welding materials, and the test sample is marked as follows:
1 #: base metal saddle steel 3Ni bridge steel
2 #: the invention relates to a titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel
2 test Structure and discussion
TABLE 1 self-Corrosion potential/V after stabilization of test steels
In a corrosive environment, when two metals form galvanic couple pairs, the one with high potential is used as a cathode, and the one with low potential is used as an anode. The driving force of galvanic corrosion is the corrosion potential difference of two metals in a continuous medium, and when galvanic couple pairs are formed by two metals with larger potential difference, the anode metal is seriously corroded. When components are required to be composed of different metals, materials with close electric potentials are selected as much as possible to be combined, structural components with large cathodes and small anodes are avoided in design, and when key parts or the areas of the parts are small, the parts are made of cathode materials. The structural part is generally designed to be that the area of an anode is larger than that of a cathode, and when the anode is large and the cathode is small, the potential difference is controlled to be less than 100 mV; the potential difference should be controlled below 10mV for small anode and large cathode, and the smaller the potential difference, the better. The potential of the solder material is higher than the potential of the base metal, typically by at least 5 mV.
The self-corrosion potential values of the base metal and the welding material test steel after the stabilization in the test are shown in the table 1, under the simulated marine atmospheric environment, the potential of the welding material is higher than that of the base metal, and the potential difference between No. 2 and No. 1 is 17 mV.
Under the simulated industrial atmospheric environment, the potential of the No. 2 material is higher than that of the base material, the potential difference between the No. 2 material and the No. 1 material is 7mV, and under the simulated industrial atmospheric environment, the No. 2 welding material is better and meets the requirement, and can be used as a welding material for atmospheric corrosion resistant steel.
In conclusion, the titanium type gas-shielded flux-cored wire for the marine atmospheric corrosion resistant steel meets the requirements of the marine atmospheric corrosion resistant steel and the industrial atmospheric corrosion resistant steel, and can be matched with the marine atmospheric corrosion resistant steel (3Ni) to be used for the construction of marine atmospheric corrosion resistant bridges.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the spirit and principles of the present invention, but rather as the description of the preferred embodiments of the present invention.
Claims (6)
1. The titanium type gas shielded flux-cored wire for the marine atmospheric corrosion resistant steel is characterized in that: comprises a medicine core and a skin;
the flux core comprises, by weight, 550 parts of rutile 250-containing materials, 10-50 parts of quartz, 5-40 parts of sodium fluoride, 1-10 parts of rare earth fluoride, 15-60 parts of a potassium-sodium arc stabilizer, 50-150 parts of a silicon-manganese alloy, 10-50 parts of metal manganese, 20-60 parts of magnesium powder, 330 parts of nickel powder 130-containing materials, 2-20 parts of molybdenum powder, 10-60 parts of copper powder, 10-60 parts of ferrotitanium, and 250 parts of iron powder 100-containing materials;
the content of deposited metal components satisfies the weather resistance total index V of more than or equal to 1.6, wherein
V＝1/{(1.0-0.16[C])×(1.05-0.05[Si])×(1.04-0.016[Mn])×(1.0-0.5[P])×(1.0+1.9[S])×(1.0-0.10[Cu])×(1.0-0.12[Ni])×(1.0-0.3[Mo])×(1.0-1.7[Ti])}；
Wherein [ C ], [ Si ], [ Mn ], [ P ], [ S ], [ Cu ], [ Ni ], [ Mo ] and [ Ti ] represent the deposited metal weight percentages of C, Si, Mn, P, S, Cu, Ni, Mo and Ti, respectively.
2. The titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel according to claim 1, characterized in that: the flux core comprises the following components, by weight, 500 parts of rutile 300-containing materials, 12-30 parts of quartz, 15-30 parts of sodium fluoride, 5-9 parts of rare earth fluoride, 20-45 parts of potassium-sodium arc stabilizer, 78-120 parts of silicon-manganese alloy, 18-42 parts of metal manganese, 30-60 parts of magnesium powder, 330 parts of nickel powder 130-containing materials, 2-18 parts of molybdenum powder, 15-60 parts of copper powder, 20-50 parts of ferrotitanium, and 230 parts of iron powder 120-containing materials.
3. The titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel according to claim 1, characterized in that: TiO in the rutile2The purity of the product is more than or equal to 95 percent; SiO in quartz2The mass fraction of the component (A) is more than or equal to 98 percent.
4. The titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel according to claim 1, characterized in that: the nickel powder contains nickel with the mass fraction more than or equal to 99.5 percent; the molybdenum powder contains molybdenum with the mass fraction of more than or equal to 99.5 percent; the copper powder contains copper with the mass fraction more than or equal to 99.5 percent.
5. The titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel according to claim 1, characterized in that: the flux core accounts for 12-20% of the total mass of the welding wire.
6. The titanium type gas shielded flux-cored wire for marine atmospheric corrosion resistant steel according to claim 1, characterized in that: the outer skin takes an SPCC-SD cold-rolled low-carbon steel strip as a raw material.
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| CN107598414B (en) * | 2017-10-26 | 2020-07-17 | 天津市金桥焊材集团股份有限公司 | Welding rod for marine atmosphere corrosion resistant steel |
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| CN109623196B (en) * | 2018-12-27 | 2021-10-15 | 天津市永昌焊丝有限公司 | High-toughness titanium flux-cored wire for weathering resistant steel |
| CN110640352B (en) * | 2019-11-13 | 2021-09-03 | 四川大西洋焊接材料股份有限公司 | Flux-cored wire for Q500qENH coating-free bridge steel and preparation method thereof |
| CN111215788A (en) * | 2019-12-04 | 2020-06-02 | 天津市永昌焊丝有限公司 | Titanium type flux-cored wire for 62 kg-grade weathering steel |
| CN115194361B (en) * | 2021-04-12 | 2024-01-26 | 天津市金桥焊材集团股份有限公司 | Low smoke and dust 50 kg-level weather-resistant flux-cored wire |
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| JP3540889B2 (en) * | 1996-03-07 | 2004-07-07 | 新日本製鐵株式会社 | Flux-cored wire for stainless steel welding |
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Effective date of registration: 20171207 Address after: 300300 Tianjin city six road, Dongli Development Zone Applicant after: Tianjin Yongchang Welding Wires Co., Ltd. Applicant after: Anshan Iron & Steel Co., Ltd. Address before: 300300 Tianjin City, Dongli Development Zone, six road No. Applicant before: Tianjin Yongchang Welding Wires Co., Ltd. |
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