CN110170771B - Corrosion-resistant ultra-low-carbon Cr25Ni20 stainless steel welding rod and preparation method thereof - Google Patents
Corrosion-resistant ultra-low-carbon Cr25Ni20 stainless steel welding rod and preparation method thereof Download PDFInfo
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- CN110170771B CN110170771B CN201910472224.5A CN201910472224A CN110170771B CN 110170771 B CN110170771 B CN 110170771B CN 201910472224 A CN201910472224 A CN 201910472224A CN 110170771 B CN110170771 B CN 110170771B
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- 238000003466 welding Methods 0.000 title claims abstract description 53
- 238000005260 corrosion Methods 0.000 title claims abstract description 43
- 230000007797 corrosion Effects 0.000 title claims abstract description 43
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 38
- 239000010935 stainless steel Substances 0.000 title claims abstract description 38
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 41
- 238000000576 coating method Methods 0.000 claims abstract description 41
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 10
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 10
- 229910000416 bismuth oxide Inorganic materials 0.000 claims abstract description 8
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims abstract description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims abstract description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 4
- AOWKSNWVBZGMTJ-UHFFFAOYSA-N calcium titanate Chemical compound [Ca+2].[O-][Ti]([O-])=O AOWKSNWVBZGMTJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010459 dolomite Substances 0.000 claims abstract description 4
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 4
- 239000010436 fluorite Substances 0.000 claims abstract description 4
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical class O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims abstract description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000004579 marble Substances 0.000 claims abstract description 4
- 229910052628 phlogopite Inorganic materials 0.000 claims abstract description 4
- -1 rare earth fluoride Chemical class 0.000 claims abstract description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 4
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 4
- 239000011259 mixed solution Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 5
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- SJKRCWUQJZIWQB-UHFFFAOYSA-N azane;chromium Chemical compound N.[Cr] SJKRCWUQJZIWQB-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims 3
- 239000011591 potassium Substances 0.000 claims 3
- 229910052700 potassium Inorganic materials 0.000 claims 3
- 239000011734 sodium Substances 0.000 claims 3
- 229910052708 sodium Inorganic materials 0.000 claims 3
- 239000007788 liquid Substances 0.000 claims 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims 2
- 229910052751 metal Inorganic materials 0.000 abstract description 14
- 239000002184 metal Substances 0.000 abstract description 14
- 239000002893 slag Substances 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 3
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910001337 iron nitride Inorganic materials 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- JTCFNJXQEFODHE-UHFFFAOYSA-N [Ca].[Ti] Chemical compound [Ca].[Ti] JTCFNJXQEFODHE-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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
- B23K35/02—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
- B23K35/36—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
- B23K35/3607—Silica or silicates
-
- 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
- B23K35/3608—Titania or titanates
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/404—Coated rods; Coated electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a corrosion-resistant ultra-low carbon Cr25Ni20 stainless steel welding rod and a preparation method thereof, wherein the stainless steel welding rod comprises a coating and a core wire, and the core wire is coated by the coating; the coating comprises the following components in percentage by mass: 3-8% of marble, 8-12% of dolomite, 5-10% of fluorite, 2-5% of titanium dioxide, 15-25% of artificial rutile, 10-15% of natural rutile, 4-9% of dehydrated ilmenite, 6-12% of calcium titanate, 1-5% of ferrotitanium, 2-5% of dehydrated phlogopite, 2-5% of electrolytic manganese, 4-9% of chromium iron nitride, 5-8% of nickel powder, 0.5-1% of rare earth fluoride, 5-8% of chromium metal, 2-5% of chromium oxide green and 0.05-0.10% of bismuth oxide. According to the invention, substances such as Ni, chromium oxide green and bismuth oxide are introduced into the coating, so that the corrosion resistance and plasticity of the weld metal are effectively improved, and the slag removal of the weld is facilitated.
Description
Technical Field
The invention relates to the field of welding materials, in particular to a corrosion-resistant ultra-low carbon type Cr25Ni20 stainless steel welding rod and a preparation method thereof.
Background
At present, 0Cr25Ni20 steel (also called AISI310S) is high-chromium high-nickel austenitic stainless steel, has excellent corrosion resistance and good high-temperature mechanical property in an oxidizing medium, and can be applied to a high-temperature corrosion-resistant environment. 00Cr25Ni20 (also called AISI310L) is an ultra-low carbon austenitic stainless steel developed from 0Cr25Ni20 steel, and has better intergranular corrosion resistance than 0Cr25Ni20 steel; the 00Cr25Ni20 steel has good welding performance, and is mainly used for equipment and parts with strong oxidizing acid corrosion, in particular to equipment with poor corrosion resistance of welded parts after welding.
In the prior art, a Cr25Ni20 stainless steel welding rod A402 (also called E310-16) is applied to welding of 00Cr25Ni20 steel, and when acid corrosion such as nitric acid corrosion requiring strong oxidizing property is carried out, because the carbon content of weld metal is too high, the intercrystalline corrosion resistance cannot meet the requirement. Therefore, the development of ultra-low carbon type Cr25Ni20 stainless steel welding rods which are suitable for welding 00Cr25Ni20 steel and have good intergranular corrosion resistance is urgent.
Disclosure of Invention
The invention aims to provide a corrosion-resistant ultra-low carbon type Cr25Ni20 stainless steel welding rod and a preparation method thereof, which are used for solving the problem that the corrosion resistance of the Cr25Ni20 stainless steel welding rod in the prior art is poor when the Cr25Ni20 stainless steel welding rod is applied to welding of 00Cr25Ni20 steel.
In order to solve the above technical problem, a first solution provided by the present invention is: a corrosion-resistant ultra-low carbon Cr25Ni20 stainless steel welding rod comprises a coating and a core wire, wherein the core wire is coated by the coating; the coating comprises the following components in percentage by mass: 3-8% of marble, 8-12% of dolomite, 5-10% of fluorite, 2-5% of titanium dioxide, 15-25% of artificial rutile, 10-15% of natural rutile, 4-9% of dehydrated ilmenite, 6-12% of calcium titanate, 1-5% of ferrotitanium, 2-5% of dehydrated phlogopite, 2-5% of electrolytic manganese, 4-9% of chromium iron nitride, 5-8% of nickel powder, 0.5-1% of rare earth fluoride, 5-8% of chromium metal, 2-5% of chromium oxide green and 0.05-0.10% of bismuth oxide.
Preferably, the core wire is a H03Cr26Ni21 stainless steel core wire.
Preferably, the ultra-low carbon type Cr25Ni20 stainless steel electrode for corrosion resistance is applied to welding 00Cr25Ni20 steel.
In order to solve the above technical problem, a second solution provided by the present invention is: a preparation method of an ultra-low carbon type Cr25Ni20 stainless steel welding rod for corrosion resistance comprises the following steps: adding the potassium-sodium water glass mixed solution into the coating raw material, and uniformly stirring to obtain a coating mixed solution; coating the flux-sheath mixed solution on the surface of a core wire, and drying to prepare an ultra-low carbon type Cr25Ni20 stainless steel welding rod for corrosion resistance; the corrosion-resistant ultra-low carbon type Cr25Ni20 stainless steel welding rod is any one of the corrosion-resistant ultra-low carbon type Cr25Ni20 stainless steel welding rods in the first solution.
Preferably, the potassium-sodium-water-glass mixed liquor accounts for 25 percent of the total mass of the raw materials of the coating, and the potassium-sodium ratio in the potassium-sodium-water-glass mixed liquor is 2: 1.
The invention has the beneficial effects that: compared with the prior art, the invention effectively improves the corrosion resistance and plasticity of the weld metal and is beneficial to slag removal of the weld by introducing Ni, chromium oxide green, bismuth oxide and other substances into the coating.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The corrosion-resistant ultra-low carbon Cr25Ni20 stainless steel welding rod comprises a coating and a core wire, wherein the core wire is coated by the coating; the coating comprises the following components in percentage by mass: 3-8% of marble, 8-12% of dolomite, 5-10% of fluorite, 2-5% of titanium dioxide, 15-25% of artificial rutile, 10-15% of natural rutile, 4-9% of dehydrated ilmenite, 6-12% of calcium titanate, 1-5% of ferrotitanium, 2-5% of dehydrated phlogopite, 2-5% of electrolytic manganese, 4-9% of chromium nitride, 5-8% of nickel powder, 0.5-1% of rare earth fluoride, 5-8% of metallic chromium, 2-5% of chromium oxide green and 0.05-0.10% of bismuth oxide; in the present embodiment, the core wire is a H03Cr26Ni21 stainless steel core wire, and the ultra-low carbon Cr25Ni20 stainless steel welding rod for corrosion resistance is applied to welding of 00Cr25Ni20 steel.
The preparation method of the ultra-low carbon Cr25Ni20 stainless steel welding rod for corrosion resistance in the invention comprises the following preparation processes: mixing the components of the coating according to the ratio to prepare a coating raw material, adding a potassium-sodium-water-glass mixed solution which accounts for 25 percent of the total mass of the coating raw material, wherein the potassium-sodium ratio of the potassium-sodium-water-glass mixed solution is 2:1, and the aim of promoting the solidification of the raw material is to prepare the coating mixed solution after uniformly stirring; coating the surface of a core wire with the coating mixed solution, and drying to prepare the corrosion-resistant ultra-low carbon type Cr25Ni20 stainless steel welding rod, wherein in the embodiment, the core wire in the above core wire proportion is a special H03Cr26Ni21 carbon steel core wire, the coating mixed solution is coated on the surface of the core wire, and the stainless steel welding rod with the corrosion-resistant ultra-low carbon type Cr25Ni20 with different diameters is prepared by natural airing for 24 hours and drying and shaping by a dryer.
Example 1
Preparing a coating raw material by using the components and mass percentage of the coating in table 1, adding a potassium-sodium-water-glass mixed solution accounting for 25% of the total mass of the coating raw material, wherein the potassium-sodium ratio of the potassium-sodium-water-glass mixed solution is 2:1, uniformly stirring to obtain the coating mixed solution, then coating the stirred coating mixed solution on a stainless steel welding core special for H03Cr26Ni21 through an oil press, naturally drying the welding rod for 24 hours, then baking and shaping the welding rod in a dryer, and finally checking and packaging to prepare the stainless steel welding rod with various specifications of diameters of 2.5mm, 3.2mm, 4.0mm, 5.0mm and the like.
TABLE 1
Welding the prepared stainless steel welding rods with various specifications, wherein the welding current is 80-110A, the welding voltage is 26-35V, and the percentage range and the sampling value of the components of the obtained welded deposited metal are shown in Table 2, which shows that the content ratio of carbon elements in the deposited metal is inhibited; meanwhile, the deposited metal is subjected to a mechanical property test, as shown in table 3, the deposited metal has high tensile strength and good stability, and meanwhile, the elongation is increased to 35% from 25% in the prior art, so that the plasticity of the weld metal is improved; in the embodiment, the welding line of the corrosion-resistant ultra-low carbon Cr25Ni20 stainless steel welding rod is of a full austenite structure, so that a rapid welding mode with low current, no swing, narrow welding pass and low linear energy is adopted during welding, the specific welding heat input is less than or equal to 1.5KJ/mm, and the interlayer temperature is controlled, and is less than or equal to 100 ℃, so that the sensitivity tendency of hot cracking is favorably reduced.
TABLE 2
| Deposited metal composition | C | Mn | Si | Cr | Ni | Mo | P | S | Cu |
| Range (%) | ≤0.04 | 1.0～2.5 | ≤0.75 | 25.0～28.0 | 20.0～25.0 | ≤0.75 | ≤0.030 | ≤0.030 | ≤0.75 |
| Sample value (%) | 0.029 | 1.70 | 0.65 | 26.80 | 22.10 | 0.17 | 0.018 | 0.010 | 0.15 |
TABLE 3
| Mechanical property parameters | Rm(MPa) | A(％) |
| Range | ≥520 | ≥25 |
| Sample values | 600 | 35 |
Based on the scheme adopted by the invention, multiple trial tests show that the ultralow-carbon austenitic stainless steel welding rod with 25% Cr-20% Ni as the main component can be used for alternating current and direct current, is welded in all positions, has extremely low carbon content, has excellent intergranular corrosion resistance, and is particularly suitable for oxidizing media such as nitric acid and the like; when the welding process is carried out, the electric arc is stable, the ripple is fine, the solder splash is small, and the slag is easy to remove; the coating has excellent fire resistance, good porosity resistance, stable mechanical property of deposited metal and high X-Ray qualification rate.
The advantages and the related mechanism of the ultra-low carbon Cr25Ni20 stainless steel electrode for corrosion resistance in the invention are as follows: 1) the addition of Ni into the coating improves the pitting corrosion resistance of the deposited metal, makes up for the problem of insufficient strength after carbon reduction, improves the plasticity of the weld metal, and improves the elongation from less than 25% in the prior art to about 35%. 2) The chromium oxide green is added into the coating, and the aim is to inhibit the recarburization problem of the titanium-calcium slag system so as to control the carbon content in the deposited metal, but the addition amount of the chromium oxide green needs to be strictly controlled, and if the chromium oxide green is excessively added, the slag removal of a welding line is not facilitated. 3) The micro bismuth oxide is added into the coating to improve slag removal, and the application scene of the corrosion-resistant ultra-low carbon Cr25Ni20 stainless steel electrode is a corrosion-resistant environment, so that the problem of high-temperature cracking after bismuth addition is avoided, and the effect of improving slag removal after the addition of the micro bismuth is remarkable.
Compared with the prior art, the invention effectively improves the corrosion resistance and plasticity of the weld metal and is beneficial to slag removal of the weld by introducing Ni, chromium oxide green, bismuth oxide and other substances into the coating.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A corrosion-resistant ultra-low carbon Cr25Ni20 stainless steel welding rod is characterized by comprising a coating and a core wire, wherein the core wire is coated by the coating;
the coating comprises the following components in percentage by mass: 3-8% of marble, 8-12% of dolomite, 5-10% of fluorite, 2-5% of titanium dioxide, 15-25% of artificial rutile, 10-15% of natural rutile, 4-9% of dehydrated ilmenite, 6-12% of calcium titanate, 1-5% of ferrotitanium, 2-5% of dehydrated phlogopite, 2-5% of electrolytic manganese, 4-9% of chromium nitride, 5-8% of nickel powder, 0.5-1% of rare earth fluoride, 5-8% of metallic chromium, 2-5% of chromium oxide green and 0.05-0.10% of bismuth oxide;
the ultra-low carbon type Cr25Ni20 stainless steel electrode for corrosion resistance is applied to welding 00Cr25Ni20 steel.
2. The ultra-low carbon Cr25Ni20 stainless steel welding rod for corrosion resistance of claim 1, wherein the core wire is H03Cr26Ni21 stainless steel core wire.
3. A preparation method of an ultra-low carbon type Cr25Ni20 stainless steel welding rod for corrosion resistance is characterized by comprising the following steps:
adding the potassium-sodium water glass mixed solution into the coating raw material, and uniformly stirring to obtain a coating mixed solution;
coating the surface of the core wire with the coating mixed solution, and drying to prepare the corrosion-resistant ultra-low carbon type Cr25Ni20 stainless steel welding rod;
the ultra-low carbon type Cr25Ni20 stainless steel welding rod for corrosion resistance is the ultra-low carbon type Cr25Ni20 stainless steel welding rod for corrosion resistance of any claim 1 to 2.
4. The method for preparing the ultra-low carbon Cr25Ni20 stainless steel welding rod for corrosion resistance of claim 3, wherein the mixed liquid of potassium, sodium and water glass is 25% of the total mass of the raw materials of the coating, and the ratio of potassium to sodium in the mixed liquid of potassium, sodium and water glass is 2: 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910472224.5A CN110170771B (en) | 2019-05-31 | 2019-05-31 | Corrosion-resistant ultra-low-carbon Cr25Ni20 stainless steel welding rod and preparation method thereof |
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| CN201910472224.5A CN110170771B (en) | 2019-05-31 | 2019-05-31 | Corrosion-resistant ultra-low-carbon Cr25Ni20 stainless steel welding rod and preparation method thereof |
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| CN110170771A CN110170771A (en) | 2019-08-27 |
| CN110170771B true CN110170771B (en) | 2021-05-25 |
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| CN115846932A (en) * | 2022-11-23 | 2023-03-28 | 山东聚力焊接材料有限公司 | Surfacing flux-cored wire and preparation method and application thereof |
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| CN1022742C (en) * | 1991-12-31 | 1993-11-17 | 巩义市金红石总厂 | Electric-melten calcium titanate product and production method |
| CN1026766C (en) * | 1992-04-11 | 1994-11-30 | 中国兵器工业第五二研究所 | Ultra-low carbon austenitic stainless steel welding rod and its making method |
| JP3441821B2 (en) * | 1994-12-12 | 2003-09-02 | 新日本製鐵株式会社 | Covered arc welding rod for austenitic stainless steel |
| CN1927528A (en) * | 2005-09-09 | 2007-03-14 | 中国船舶重工集团公司第七二五研究所 | Intergranular corrosion resistant high-strength full austenite welding rod |
| CN101362260B (en) * | 2008-09-27 | 2010-10-27 | 北京金威焊材有限公司 | Stainless steel electrode special for magnesium reduction pot |
| CN103921018B (en) * | 2014-04-25 | 2016-02-10 | 湖北船王特种焊材有限公司 | A kind of super austenitic stainless steel welding rod |
| CN105215580B (en) * | 2015-11-16 | 2017-06-20 | 洛阳双瑞特种合金材料有限公司 | A kind of E309L stainless steels that can be used for high current welding lengthen welding rod |
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Denomination of invention: A corrosion-resistant ultra-low carbon Cr25Ni20 stainless steel electrode and its preparation method Effective date of registration: 20231020 Granted publication date: 20210525 Pledgee: Bank of China Limited Huanggang branch Pledgor: HUBEI CHUANWANG SPECIAL WELDING MATERIALS Co.,Ltd. Registration number: Y2023980061924 |