CN111266713B - Deposited metal material for ultralow-temperature 304L austenitic stainless steel welding and preparation method - Google Patents
Deposited metal material for ultralow-temperature 304L austenitic stainless steel welding and preparation method Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 135
- 239000007769 metal material Substances 0.000 title claims abstract description 20
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000011651 chromium Substances 0.000 claims abstract description 15
- 230000004907 flux Effects 0.000 claims abstract description 14
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000000151 deposition Methods 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 239000011737 fluorine Substances 0.000 claims description 2
- 229910052731 fluorine Inorganic materials 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 27
- 229910052751 metal Inorganic materials 0.000 abstract description 16
- 239000002184 metal Substances 0.000 abstract description 16
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 13
- 229910001566 austenite Inorganic materials 0.000 description 9
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- 238000007778 shielded metal arc welding Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a deposited metal material for ultralow-temperature 304L austenitic stainless steel welding and a preparation method thereof, wherein the deposited metal material comprises the following components in percentage by weight: c: 0.02 to 0.04%, Si: less than or equal to 0.5 percent, Mn: 1.0-2.5%, P: less than or equal to 0.025 percent, S: less than or equal to 0.015 percent, Ni: 11.5-12.5%, Cr: 18-19%, Mo: less than or equal to 0.1 percent, Cu: less than or equal to 0.75 percent, and the balance being iron. The deposited metal material is formed by combining a submerged arc welding wire and a welding flux and depositing the combination by submerged arc welding or by depositing a welding rod by arc welding. The equivalent ratio of chromium to nickel is controlled to be less than or equal to 1.45 in the process of selecting welding materials, so that the designed welding rod and submerged arc welding wire deposited metal have reasonable alloy element proportion and stable mechanical property, and particularly have good ultralow temperature toughness and good crack resistance. The impact energy of the welding line at minus 196 ℃ is more than or equal to 50J after the welding line is subjected to heat treatment at 570 +/-10 ℃ for 1 h.
Description
Technical Field
The invention belongs to the field of welding, relates to a welding material, and particularly relates to a deposited metal material for ultralow-temperature 304L austenitic stainless steel welding and a preparation method thereof.
Background
A certain large pressure container in China is of a full stainless steel structure, the design working temperature is-163 ℃ to-196 ℃, the material mainly used is 304L, and the low-temperature impact energy (AKV) is required when a welding line and a heat affected zone are at 77K (-196 ℃) after postweld heat treatment2) Not less than 50J。
The reliable and practical welding methods for austenitic stainless steel pressure vessel products at present are shielded metal arc welding and submerged arc welding, and the welding material models matched with the welding material model number of 304L are E308L-XX and S F308L FB-S308L. The 308L welding material usually contains 5-12 FN ferrite, the existence of the ferrite can effectively prevent hot cracks in the welding process, but the ultralow temperature toughness of the deposited metal is greatly reduced, and particularly after heat treatment, the ultralow temperature toughness is further reduced. The impact energy of 308L welding rods, submerged arc welding wires and welding flux deposited metal at home and abroad at-196 ℃ is about 33J, and the value of the impact energy is reduced to about 15J after heat treatment, so that the requirement of the project cannot be met.
In order to ensure that the impact energy of the 304L welded joint after heat treatment at the temperature of-196 ℃ is not less than 50J, nickel-based welding materials or all-austenite welding materials can be adopted, but the nickel content of the welding materials is high, so that the price of the welding materials is more than 200 yuan/kg, the economic benefit is poor, and resources are wasted.
Disclosure of Invention
In order to solve the technical problems, the invention provides a deposited metal material chemical composition design for ultralow temperature 304L austenitic stainless steel welding, which can ensure that the designed welding rod or submerged arc welding wire and welding flux combined deposited metal has reasonable alloy element proportion and stable mechanical property, particularly has good ultralow temperature toughness and good crack resistance.
In order to solve the technical problems, the invention adopts the technical scheme that:
a deposited metal material for ultralow-temperature 304L austenitic stainless steel welding, which is characterized in that: the weight percentages are as follows: c: 0.02 to 0.04%, Si: less than or equal to 0.5 percent, Mn: 1.0-2.5%, P: less than or equal to 0.025 percent, S: less than or equal to 0.015 percent, Ni: 11.5-12.5%, Cr: 18-19%, Mo: less than or equal to 0.1 percent, Cu: less than or equal to 0.75 percent, and the balance being iron.
Preferably, the equivalent ratio of chromium to nickel in the deposited metal material is less than or equal to 1.45, namely
Preferably, the ferrite number of the deposited metal material is not more than 2.5 FN.
Preferably, the welding flux matched with the submerged arc welding wire is of a fluorine alkali type, and the main chemical components comprise the following components in percentage by weight: CaO + MgO + CaF2+MnO≥50％，SiO2≤20％，CaF2≥15％。
A method for producing a deposited metal material for welding any one of the ultralow temperature 304L austenitic stainless steels, characterized by comprising: the deposited metal material is formed by combining a submerged arc welding wire and a welding flux and depositing the combination by submerged arc welding or by depositing a welding rod by arc welding.
Preferably, the control line energy is less than or equal to 24KJ/cm during the submerged arc welding or arc welding process.
Preferably, the interlayer temperature is controlled to be less than or equal to 100 ℃ in the submerged arc welding or arc welding process.
In order to improve the ultralow temperature toughness of the 304L welding joint, the-196 ℃ impact value after heat treatment is more than or equal to 50J, and the ferrite content in the welding material deposited metal needs to be reduced. As is clear from the WRC-1992(FN) phase composition diagram, the direct factor affecting the ferrite content in the weld deposit metal is the chromium-nickel equivalence ratio, and therefore the proportion of the weld deposit metal alloying elements must be controlled to improve the ultra-low temperature toughness, rather than increasing the nickel content at once. Through a plurality of tests, the equivalent ratio of chromium to nickel is controlled to be less than or equal to 1.45, the number of ferrite in the deposited metal of the welding material is controlled to be less than or equal to 2.5FN, the welding material has enough strength, the requirement that the impact energy of the deposited metal after heat treatment at-196 ℃ is more than or equal to 50J is met, and the cracking resistance of the welding material is very excellent due to the fact that a certain amount of ferrite is contained. The effects of the various alloying elements of the present invention are described below:
carbon (C) is the most economical chemical element for improving the strength of steel, but in stainless steel carbon forms Cr with chromium23C6Therefore, the corrosion resistance of the stainless steel is reduced, and the maximum carbon content is 0.04% for the low-carbon type stainless steel welding material. The present invention limits the carbon content to a minimum of 0.02% because carbon expands the austenite phase region, increasing the number of nickel equivalents.
Silicon (Si) can reduce weldability of steel and segregate to form a low melting point eutectic component during solidification, particularly after combination with nickel, and thus the present invention limits the maximum silicon content to 0.5%.
Mn (manganese) can effectively stabilize austenite at low temperature, prevent the austenite from being transformed into martensite, and can effectively prevent hot cracks from occurring in the welding process. Manganese also has some solid solution strengthening effect but no embrittlement effect, so the present invention limits the manganese content to a minimum of 1.0%.
Cr (chromium) is the most predominant ferrite-forming element in stainless steel, and in order to reduce the number of chromium equivalents and the ferrite content in the weld material, the present invention limits the maximum chromium content to 19%.
Nickel (Ni) is an austenite forming element, and the austenite phase region can be expanded greatly after sufficient nickel is added to the stainless steel, so that the austenite can be stabilized at low temperature. Through a plurality of welding tests, the nickel content is determined to be most suitable between 11.5 and 12.5 percent, the impact value of the welded joint at the temperature of-196 ℃ after heat treatment is more than or equal to 50J, and the nickel can be saved to the greatest extent.
Molybdenum (Mo) is a ferrite-forming element and promotes the formation and retention of ferrite in the steel structure. Molybdenum is added to stainless steels primarily to improve corrosion resistance, particularly pitting and crevice corrosion resistance, and also to improve high temperature strength. 304L is mainly used in low temperature environment rather than corrosive medium, so too much molybdenum content in the welding material is meaningless, ferrite content is increased, and the invention limits the molybdenum content to 0.1% at most.
The content of sulfur (S) and phosphorus (P) meets the NB/T47018-.
The invention has the beneficial effects that:
according to the invention, the equivalent ratio of chromium to nickel is controlled to be less than or equal to 1.45 by accurately controlling deposited metal alloy components of the welding material, after welding is carried out according to a strictly specified process, the number of ferrite in a welding seam tissue is ensured to be less than or equal to 2.5FN, so that the welding seam has good strength and excellent ultralow temperature toughness, and the impact energy of the welding seam at minus 196 ℃ is more than or equal to 50J after the welding seam is subjected to heat treatment at 570 +/-10 ℃ for 1 h. Meanwhile, compared with a nickel-based welding material or a full austenite welding material, the welding material has lower nickel content and good economic benefit.
Detailed Description
The present invention will be described in further detail with reference to the following examples:
example 1
In the embodiment, 304L of three different welding rods E308L-XX are adopted for arc welding, the welding position is vertical welding, heat treatment is carried out at 570 +/-10 ℃ for 1h after welding, and the diameters of the welding rods are all 3.2 mm. The brands, deposited metal chemical compositions and chromium-nickel equivalent ratio values of the three welding rods are shown in table 1, the chemical compositions of 304L are shown in table 2, the welding process parameters are shown in table 3, and the impact energy of the welding seam at-196 ℃ is shown in table 4.
Comparing table 1 and table 4, it can be seen that as the cr-ni equivalence ratio value decreases, the ferrite content in the electrode gradually decreases, and the weld-196 ℃ impact work gradually increases, when the cr-ni equivalence ratio value is 1.44, the ferrite content in the weld is about 2FN, and the weld-196 ℃ impact work is 56.7J, and it can be expected that when the cr-ni equivalence ratio value is within 1.45, the weld-196 ℃ impact work must be more than 50J. Table 1, beijing lei E308L-16 (modification 2) is a modified version of a conventional 308L electrode having a chemical composition and a cr-ni equivalent ratio consistent with the specifications of the present invention.
TABLE 1 chemical composition table of deposited metal of welding rod
TABLE 2304L chemical composition TABLE
TABLE 3 welding Process parameters
TABLE 4 weld-196 ℃ impact energy
| Welding method and welding position | Brand and model of welding rod | Weld impact value (J) KV2 |
| SMAW 3G | Isa E308L-15 | 10、10、9 |
| SMAW 3G | Jinglei E308L-16 (modified type 1) | 42、48、46 |
| SMAW 3G | Jinglei E308L-16 (modified type 2) | 60、52、58 |
Example 2
In the embodiment, 304L of submerged arc welding is adopted by combining three different S F308L FB-S308L submerged arc welding wires and welding fluxes, the welding position is flat welding, heat treatment is carried out at 570 +/-10 ℃ for 1h after welding, and the diameters of the welding wires are all 4.0 mm. The brands, deposited metal chemical compositions and chromium-nickel equivalent ratio values of the three submerged arc welding wires and the welding flux are shown in table 5, the corresponding chemical compositions of the welding flux are shown in table 6, the 304L chemical compositions are shown in table 2 in example 1, the welding process parameters are shown in table 7, and the impact energy of the welding seam at-196 ℃ is shown in table 8.
Comparing table 5 and table 8, it can be seen that as the cr-ni equivalence ratio value decreases, the ferrite content in the submerged arc welding wire and the welding flux deposited metal gradually decreases, and the weld-196 ℃ impact power gradually increases, and when the cr-ni equivalence ratio value is 1.45, the ferrite content in the weld is about 2 to 2.5FN, and the weld-196 ℃ impact power is 57J, it is expected that when the cr-ni equivalence ratio value is within 1.45, the weld-196 ℃ impact power must be 50J or more. In Table 5, Haweier S F308L FB-S308L is a modified version of a conventional 308L submerged arc welding wire, and the chemical composition and the chrome-nickel equivalent ratio meet the technical requirements of the invention.
TABLE 5 welding wire and welding flux combination deposited metal chemical composition table
TABLE 6 flux chemical composition Table
TABLE 7 welding Process parameters
TABLE 8 weld impact work at-196 deg.C
| Welding method and welding position | Brand and model of welding wire and flux | Weld impact value (J) KV2 |
| SAW 1G | Jinglei S F308L FB-S308L | 12.5、10、11.7 |
| SAW 1G | Jinglei S F308L FB-S308L (modified type) | 39、41、44 |
| SAW 1G | Haweil S F308L FB-S308L | 56、61、54 |
No matter the welding rod of the Beijing Lei E308L-16 (improved type 2) in the embodiment 1 or the Haweier S F308L FB-S308L in the embodiment 2, the appearance quality, the internal quality and the mechanical property of the welding joint all meet the requirements of NB/T47014 and 2011 evaluation on the welding process of pressure-bearing equipment.
The experiments show that the deposited metal of the welding rod and the submerged arc welding wire designed by the invention has reasonable chemical components and chromium-nickel equivalent ratio, the deposited metal has excellent ultralow-temperature toughness, and the welding rod and the submerged arc welding wire are suitable for welding 304L austenitic stainless steel in an ultralow-temperature environment, and the impact energy of a welding joint after heat treatment at-196 ℃ is more than or equal to 50J.
4. Innovation point
(1) According to the invention, the equivalent ratio of chromium to nickel of alloy elements of the welding material is controlled to be less than or equal to 1.45, ferrite in a welding seam tissue is ensured to be less than or equal to 2.5FN after welding according to a strictly specified process, the welding seam has good strength and excellent ultralow temperature toughness, and the impact energy of the welding seam at minus 196 ℃ is more than or equal to 50J after heat treatment at 570 +/-10 ℃ for 1h, so that the technical problem of lower impact energy of a welding joint adopting the traditional welding material is solved.
(2) According to the invention, through accurately controlling the deposited metal alloy components of the welding material, the nickel content in the welding material is saved to the greatest extent while the ultralow-temperature toughness is improved, the problem that a nickel-based welding material or a full-austenite welding material with higher price must be adopted is solved, and the method has good economic benefits.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (5)
1. A deposited metal material for ultralow-temperature 304L austenitic stainless steel welding, which is characterized in that: the weight percentages are as follows: c: 0.02 to 0.04%, Si: less than or equal to 0.5 percent, Mn: 1.0-2.5%, P: less than or equal to 0.025 percent, S: less than or equal to 0.015 percent, Ni: 11.5-12.5%, Cr: 18-19%, Mo: less than or equal to 0.1 percent, Cu: less than or equal to 0.75 percent, and the balance of iron;
the equivalent ratio of chromium to nickel in the deposited metal material is less than or equal to 1.45, namely
The ferrite number of the deposited metal material is less than or equal to 2.5 FN.
2. The deposited metal material for welding of 304L austenitic stainless steel of ultra-low temperature according to claim 1, wherein: the flux matched with the submerged arc welding wire is of a fluorine alkali type, and comprises the following main chemical components in percentage by weight: CaO + MgO + CaF2+MnO≥50％，SiO2≤20％，CaF2≥15％。
3. A method for producing a deposited metal material for welding of the ultralow temperature 304L austenitic stainless steel according to claim 1 or 2, characterized by: the deposited metal material is formed by combining a submerged arc welding wire and a welding flux and depositing the combination by submerged arc welding or by depositing a welding rod by arc welding.
4. The method of manufacturing a deposited metal material for welding of 304L austenitic stainless steel of ultra low temperature according to claim 3, characterized in that: and controlling the line energy to be less than or equal to 24KJ/cm in the submerged arc welding or arc welding process.
5. The method of manufacturing a deposited metal material for welding of 304L austenitic stainless steel of ultra low temperature according to claim 3, characterized in that: and controlling the interlayer temperature to be less than or equal to 100 ℃ in the submerged arc welding or arc welding process.
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| CN106457480A (en) * | 2014-06-11 | 2017-02-22 | 株式会社神户制钢所 | Buildup welded metal and machine structure |
| CN106736028A (en) * | 2016-12-15 | 2017-05-31 | 昆山京群焊材科技有限公司 | A kind of austenitic stainless steel welding wire for submerged-arc welding |
| CN108406167A (en) * | 2017-02-09 | 2018-08-17 | 奥林康焊接技术有限公司 | Sintered flux and the austenitic stainless steel buried arc welding method for using the solder flux |
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Effective date of registration: 20240625 Address after: 430000 Industrial Park, Yangluo Development Zone, Xinzhou District, Wuhan City, Hubei Province Patentee after: WUHAN YIYE STEEL STRUCTURE Co.,Ltd. Country or region after: China Patentee after: Institute of High Speed Aerodynamics, China Aerodynamic Research and Development Center Address before: 430000 Industrial Park, Yangluo Development Zone, Xinzhou District, Wuhan City, Hubei Province Patentee before: WUHAN YIYE STEEL STRUCTURE Co.,Ltd. Country or region before: China |