CN114131243A - Self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel - Google Patents

Self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel Download PDF

Info

Publication number
CN114131243A
CN114131243A CN202111622844.6A CN202111622844A CN114131243A CN 114131243 A CN114131243 A CN 114131243A CN 202111622844 A CN202111622844 A CN 202111622844A CN 114131243 A CN114131243 A CN 114131243A
Authority
CN
China
Prior art keywords
ultralow
self
flux
temperature high
manganese steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202111622844.6A
Other languages
Chinese (zh)
Other versions
CN114131243B (en
Inventor
孟庆润
王红鸿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University of Science and Engineering WUSE
Original Assignee
Wuhan University of Science and Engineering WUSE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan University of Science and Engineering WUSE filed Critical Wuhan University of Science and Engineering WUSE
Priority to CN202111622844.6A priority Critical patent/CN114131243B/en
Publication of CN114131243A publication Critical patent/CN114131243A/en
Application granted granted Critical
Publication of CN114131243B publication Critical patent/CN114131243B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention relates to a self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel. The technical scheme is as follows: the self-protection flux-cored wire consists of a carbon steel strip, a single-stranded alloy welding wire and flux-cored powder; the carbon steel strip comprises the following chemical components: 0.03-0.05 wt% of C, 0.05-0.08 wt% of Si, 0.5-0.8 wt% of Mn, less than or equal to 0.005 wt% of P and less than or equal to 0.005 wt% of S; the chemical components of the single-strand alloy welding wire are as follows: 0.3 to 0.6 wt% of C, 0.05 to 0.2 wt% of Si, 24 to 33 wt% of Mn, less than or equal to 0.003 wt% of P, less than or equal to 0.003 wt% of S, and 4 to 7 wt% of Ni; the chemical components of the medicine core powder are as follows: 40-50 wt% of barium fluoride, 10-17 wt% of rutile, 4-7 wt% of aluminum powder and 2-6 wt% of sodium fluoroaluminate. The balance of the three chemical components are Fe and inevitable impurities respectively. The weld metal formed by the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel prepared by the invention has the characteristic of high toughness under the ultralow-temperature service condition, and the strength is matched with that of the ultralow-temperature high-manganese steel.

Description

Self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel
Technical Field
The invention belongs to the technical field of flux-cored wires suitable for ultralow-temperature high-manganese steel. In particular to a self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel.
Background
The ultra-low temperature high manganese steel is a high-stability austenite structure obtained by taking C-Mn-Cr as a main component system, has the remarkable characteristics of high elongation, low yield ratio, excellent low-temperature performance at-196 ℃, no magnetism, low welding cost and the like, is a leading-edge material for a low-temperature service environment, is expected to be widely applied to the fields of LNG transport ship cargo tanks, LNG fuel ship fuel tanks and the like, and can realize Ni reduction of steel plates and greatly reduce the construction cost.
The existing self-protection core flux-cored wire technology for ultralow-temperature high-manganese steel has the problem of insufficient toughness, for example, the technology disclosed in the patent of 'self-protection core flux-cored wire for ultralow-temperature high-manganese steel' (CN112894198A) has the problems of insufficient impact toughness (-196 ℃ impact power of 60-90J), higher impact toughness (-196 ℃ impact at about 200J) of an ultralow-temperature high-manganese steel base metal steel plate, mismatching of the two, and difficulty in meeting the technical requirements of the strength and ultralow-temperature toughness of an LNG storage tank for-196 ℃ working temperature on welding performance, and thus the safety of the use of the tank body is seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and aims to provide a self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel, wherein the weld metal formed by the wire has good forming property and excellent low-temperature toughness, the strength of the wire is matched with that of the ultralow-temperature high-manganese steel, and the wire is particularly suitable for the technical requirements of the strength and the ultralow-temperature toughness of an LNG storage tank at the working temperature of-196 ℃.
In order to achieve the purpose, the invention adopts the technical scheme that:
the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux-cored powder, wherein the flux-cored powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the center line of the single-strand alloy welding wire is superposed with the center line of the carbon steel strip.
The carbon steel strip comprises the following chemical components: c is 0.03-0.05 wt%; si is 0.05-0.08 wt%; mn is 0.5-0.8 wt%; p is less than or equal to 0.005 wt%; s is less than or equal to 0.005 wt%; the balance being Fe and unavoidable impurities.
The single-strand alloy welding wire comprises the following chemical components: c is 0.3-0.6 wt%; si is 0.05-0.2 wt%; mn is 24-33 wt%; p is less than or equal to 0.003 wt%; s is less than or equal to 0.003 wt%; ni is 4-7 wt%; the balance being Fe and unavoidable impurities.
The chemical components of the medicine core powder are as follows: 40-50 wt% of barium fluoride; 10-17 wt% of rutile; 4-7 wt% of aluminum powder; the sodium fluoroaluminate accounts for 2-6 wt%; the balance being Fe and unavoidable impurities.
The preparation method of the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel comprises the following steps: the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel is prepared by adopting a butt joint O-shaped sealing mode and through drawing, forming and reducing.
The purity of the barium fluoride is more than or equal to 99 percent; the particle size of the barium fluoride is 0.15-0.20 mm.
The purity of the rutile is more than or equal to 98 percent; the particle size of the rutile is 0.15-0.25 mm.
The purity of the aluminum powder is more than or equal to 99 percent; the granularity of the aluminum powder is less than or equal to 0.30 mm.
The purity of the sodium fluoroaluminate is more than or equal to 99 percent; the granularity of the sodium fluoroaluminate is 0.15-0.20 mm.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
the self-protection flux-cored wire adopted by the invention adopts a mode of single-strand alloy welding wire transition alloy elements, the flux-cored powder transition alloy only plays a role in gas protection, the Mn content of formed weld metal is 24-26 wt%, the Mn content is similar to that of a base metal, and the matching of the weld metal and the base metal is ensured.
The manganese and the carbon elements in the invention are all austenitizing elements, and form weld metal with a full austenite structure. When the carbon content is too low, the yield strength is low due to insufficient austenitizing elements, and when the carbon content is too high, the structure is deteriorated to affect the toughness. When the manganese content is too low, a single austenite structure is not formed sufficiently; when the manganese content is too high, the tensile strength is lowered. Meanwhile, the high-manganese low-nickel alloy system is formed by replacing expensive nickel with manganese, so that the single-strand alloy welding wire contains 0.3-0.6 wt% of C and 24-33 wt% of Mn, an austenite structure not only obtains good ultralow-temperature toughness, but also reduces the cost.
The nickel element is used as an austenite forming element, the cost is increased due to the excessively high content, and the toughness of the welding seam is affected due to the excessively low content. Therefore, the Ni content in the single-stranded alloy welding wire is 4-7 wt%, so that the good ultralow-temperature toughness is ensured, and the lower production cost is also ensured.
In the invention, the existence of impurity elements of sulfur and phosphorus enables weld metal to generate liquefaction cracks and reheating cracks, so the content of the sulfur and phosphorus elements is strictly controlled, and the single-strand alloy welding wire comprises the following components: p is less than or equal to 0.003 wt% and S is less than or equal to 0.003 wt%. By purifying the molten steel, the P and S contents of the welding wire are reduced to the minimum, and the welding seam is ensured to have lower hot crack sensitivity.
In addition, the component system of the medicinal core powder contains barium fluoride and rutile, and is used for adjusting the fluidity of molten iron. The two components with too high or too low contents can not play a role in adjusting the fluidity of the molten iron, and the molding is not good. Therefore, in the powder of the explosive core, the content of barium fluoride is 40-50 wt% and the content of rutile is 10-17 wt%, and the fluidity of molten iron can be adjusted, so that weld metal is well formed when welding is carried out at all positions.
The aluminum powder adopted in the flux-cored powder is an important deoxidizer in a self-protecting welding wire, if the aluminum content in deposited metal is increased, the oxygen content and the nitrogen content are obviously reduced, and the anti-porosity performance is obviously improved. Aluminum is effective in reducing the susceptibility of weld porosity, the main reason for this is its very strong deoxidizing capacity. On the other hand, aluminum and nitrogen have strong binding force, stable nitride can be formed, the nitride is insoluble in weld metal and is melted in slag, and a certain amount of aluminum can ensure the anti-porosity performance. Therefore, the addition amount of the magnesium-aluminum alloy in the invention is 4-7 wt% of the powder of the explosive core, the oxygen content and the nitrogen content in deposited metal can be effectively reduced, and the anti-porosity property can be obviously improved.
The sodium fluoroaluminate adopted in the powder core can be dehydrogenated, and the proper amount of sodium fluoroaluminate can also play roles in stabilizing electric arc and slagging. Therefore, the sodium fluoroaluminate in the invention is added in an amount of 2-6 wt% of the powder core, and can remove hydrogen, stabilize electric arc and slag.
The self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel prepared by the invention is suitable for self-protection welding of the ultralow-temperature high-manganese steel, and weld metal forms a full austenite structure, so that the self-protection flux-cored wire not only ensures higher ultralow-temperature toughness, but also ensures the impact energy A at-196 DEG Ckv95 to 137J; sufficient strength is also ensured: the yield strength is 420-490 MPa, the tensile strength is 615-713 MPa, the elongation A is 33-45%, and the mechanical property requirement and the ultra-low temperature toughness requirement of the ultra-low temperature high manganese steel at the working temperature of-196 ℃ are met.
Therefore, the weld metal formed by the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel prepared by the invention has good forming property and excellent low-temperature toughness, the strength is matched with that of the ultralow-temperature high-manganese steel, and the self-protection flux-cored wire is particularly suitable for the technical requirements of the strength and the ultralow-temperature toughness of an LNG storage tank at the working temperature of-196 ℃ below zero
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
A self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel. The self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux-cored powder, wherein the flux-cored powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the center line of the single-strand alloy welding wire is superposed with the center line of the carbon steel strip.
The carbon steel strip comprises the following chemical components: c is 0.03-0.05 wt%; si is 0.05-0.08 wt%; mn is 0.5-0.8 wt%; p is less than or equal to 0.005 wt%; s is less than or equal to 0.005 wt%; the balance being Fe and unavoidable impurities.
The single-strand alloy welding wire comprises the following chemical components: c is 0.3-0.6 wt%; si is 0.05-0.2 wt%; mn is 24-33 wt%; p is less than or equal to 0.003 wt%; s is less than or equal to 0.003 wt%; ni is 4-7 wt%; the balance being Fe and unavoidable impurities.
The chemical components of the medicine core powder are as follows: 40-50 wt% of barium fluoride; 10-17 wt% of rutile; 4-7 wt% of aluminum powder; the sodium fluoroaluminate accounts for 2-6 wt%; the balance being Fe and unavoidable impurities.
In this embodiment:
the preparation method of the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel comprises the following steps: the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel is prepared by adopting a butt joint O-shaped sealing mode and through drawing, forming and reducing.
The purity of the barium fluoride is more than or equal to 99 percent; the particle size of the barium fluoride is 0.15-0.20 mm.
The purity of the rutile is more than or equal to 98 percent; the particle size of the rutile is 0.15-0.25 mm.
The purity of the aluminum powder is more than or equal to 99 percent; the granularity of the aluminum powder is less than or equal to 0.30 mm.
The purity of the sodium fluoroaluminate is more than or equal to 99 percent; the granularity of the sodium fluoroaluminate is 0.15-0.20 mm.
The welding current is 200-230A, the arc voltage is 20-25V, the welding speed is 21-23 cm/min, and the welding line energy is 13-18 kJ/cm.
The detailed description is omitted in the embodiments.
Example 1
A self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel. The self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel consists of a carbon steel strip, a single-stranded alloy welding wire and flux-cored powder; the flux-cored powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the center line of the single-strand alloy welding wire is superposed with the center line of the carbon steel strip.
The thickness of the ultra-low temperature high manganese steel plate in the embodiment is 20 mm. The ultralow-temperature high manganese steel comprises the following chemical components: c is 0.42 wt%; si is 0.14 wt%; mn is 23 wt%; n is 0.04 wt%; p is 0.003 wt%; s is 0.003 wt%. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the yield strength is 480MPa, the tensile strength is 760MPa, and the elongation is 40 percent; the impact work at-196 ℃ is 114J.
The carbon steel strip comprises the following chemical components: c is 0.03 wt%; si is 0.06 wt%; mn is 0.5 wt%; p is less than or equal to 0.002 wt%; s is less than or equal to 0.005 wt%; the balance being Fe and unavoidable impurities.
The single-strand alloy welding wire comprises the following chemical components: c is 0.3 wt%; si is 0.1 wt%; mn is 25 wt%; p is 0.002 wt%; s is 0.001 wt; ni is 4 wt%; the balance being Fe and unavoidable impurities.
The chemical components of the medicine core powder are as follows: the barium fluoride accounts for 42 wt%; 11 wt% of rutile; 4 wt% of aluminum powder; 3 wt% of sodium fluoroaluminate; the balance being Fe and unavoidable impurities.
The mechanical properties and deposition rate of the welded weld metal of the self-shielded flux-cored wire suitable for ultralow-temperature high-manganese steel prepared by the embodiment are detected and analyzed: the yield strength of the weld metal is 430 MPa; the tensile strength is 620 MPa; elongation a ═ 36%; average value of impact energy A at-196 DEG Ckv＝99J。
The detection and analysis result shows that: the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel prepared by the embodiment has the characteristic that the weld metal has high toughness under the ultralow-temperature service condition, and the welding joint meets the technical requirement of an LNG storage tank with the working temperature of-196 ℃.
Example 2
A self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel. The self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux-cored powder, wherein the flux-cored powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the center line of the single-strand alloy welding wire is superposed with the center line of the carbon steel strip.
The thickness of the ultra-low temperature high manganese steel plate in the embodiment is 20 mm. The ultralow-temperature high manganese steel comprises the following chemical components: c is 0.44 wt%; si is 0.15 wt%; mn is 25 wt%; n is 0.05 wt%; p is 0.002 wt%; s is 0.002 wt%. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the yield strength is 493 MPa; the tensile strength is 782 MPa; the elongation is 42%; the impact energy is 125J at the temperature of 196 ℃ below zero.
The carbon steel strip comprises the following chemical components: c is 0.03 wt%; si is 0.08 wt%; mn is 0.7 wt%; p is less than or equal to 0.004 wt%; s is less than or equal to 0.002 wt%; the balance being Fe and unavoidable impurities.
The chemical components of the single-strand alloy welding wire are as follows: c is 0.4 wt%; si is 0.15 wt%; mn is 29 wt%; p is 0.002 wt%; s is 0.002 wt; ni is 6 wt%; the balance being Fe and unavoidable impurities.
The chemical components of the medicine core powder are as follows: 45 wt% of barium fluoride; rutile is 14 wt%; 5.5 wt% of aluminum powder; sodium fluoroaluminate 4.5 wt%; the balance being Fe and unavoidable impurities.
The mechanical properties and deposition rate of the welded weld metal of the self-shielded flux-cored wire suitable for ultralow-temperature high-manganese steel prepared by the embodiment are detected and analyzed: the yield strength of the weld metal is 460 MPa; tensile strength is 655 MPa; elongation a 39%; average value of impact energy A at-196 DEG Ckv＝125J。
The detection and analysis result shows that: the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel prepared by the embodiment has the characteristic that the weld metal has high toughness under the ultralow-temperature service condition, and the welding joint meets the technical requirement of an LNG storage tank with the working temperature of-196 ℃.
Example 3
A self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel. The self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux-cored powder, wherein the flux-cored powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the center line of the single-strand alloy welding wire is superposed with the center line of the carbon steel strip.
The thickness of the ultra-low temperature high manganese steel plate in the embodiment is 20 mm. The ultralow-temperature high manganese steel comprises the following chemical components: c is 0.48 wt%; si is 0.20 wt%; mn is 27 wt%; n is 0.07 wt%; p is 0.003 wt%; s is 0.002 wt%. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the yield strength is 507MPa, the tensile strength is 802MPa, and the elongation is 44%; the impact work at-196 ℃ is 145J.
The carbon steel strip comprises the following chemical components: c is 0.05 wt%; si is 0.08 wt%; mn is 0.7 wt%; p is less than or equal to 0.004 wt%; s is less than or equal to 0.003 wt%; the balance being Fe and unavoidable impurities.
The chemical components of the single-strand alloy welding wire are as follows: c is 0.5 wt%; si is 0.2 wt%; mn is 32 wt%; p is 0.001 wt%; s is 0.001 wt; ni is 7 wt%; the balance being Fe and unavoidable impurities.
The chemical components of the medicine core powder are as follows: 48 wt% of barium fluoride; 16 wt% of rutile; 6.3 wt% of aluminum powder and 5.5 wt% of sodium fluoroaluminate; the balance being Fe and unavoidable impurities.
The mechanical properties and deposition rate of the welded weld metal of the self-shielded flux-cored wire suitable for ultralow-temperature high-manganese steel prepared by the embodiment are detected and analyzed: the yield strength of the weld metal is 480 MPa; the tensile strength is 695 MPa; elongation a ═ 43%; average value of impact energy A at-196 DEG Ckv＝132J。
The detection and analysis result shows that: the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel prepared by the embodiment has the characteristic that the weld metal has high toughness under the ultralow-temperature service condition, and the welding joint meets the technical requirement of an LNG storage tank with the working temperature of-196 ℃.
Compared with the prior art, the specific implementation mode has the following positive effects:
the self-protection flux-cored wire adopted by the specific embodiment adopts a mode of single-strand alloy wire transition alloy elements, the flux-cored powder transition alloy only plays a role in gas protection, the Mn content of formed weld metal is 24-26 wt%, the Mn content of the formed weld metal is similar to that of base metal, and the matching of the weld metal and the base metal is ensured.
In the embodiment, the manganese and the carbon are all austenitizing elements, so that the weld metal with a full austenite structure is formed. When the carbon content is too low, the yield strength is low due to insufficient austenitizing elements, and when the carbon content is too high, the structure is deteriorated to affect the toughness. When the manganese content is too low, a single austenite structure is not formed sufficiently; when the manganese content is too high, the tensile strength is lowered. Meanwhile, the embodiment replaces expensive nickel with manganese to form a high-manganese low-nickel alloy system, so that the single-strand alloy welding wire contains 0.3-0.6 wt% of C and 24-33 wt% of Mn, and an austenite structure not only obtains good ultralow-temperature toughness, but also reduces the cost.
The nickel element is used as an austenite forming element, the cost is increased due to the excessively high content, and the toughness of the welding seam is affected due to the excessively low content. Therefore, the Ni content in the single-stranded alloy welding wire of the embodiment is 4-7 wt%, so that the good ultralow-temperature toughness is ensured, and the lower production cost is also ensured.
In the specific embodiment, the existence of impurity elements of sulfur and phosphorus enables weld metal to generate a liquefied crack and a reheated crack, so that the content of the sulfur and phosphorus elements is strictly controlled, and the single-strand alloy welding wire is characterized in that: p is less than or equal to 0.003 wt% and S is less than or equal to 0.003 wt%. By purifying the molten steel, the P and S contents of the welding wire are reduced to the minimum, and the welding seam is ensured to have lower hot crack sensitivity.
In addition, the component system of the powder core of the embodiment contains barium fluoride and rutile, and is used for adjusting the fluidity of the molten iron. The two components with too high or too low contents can not play a role in adjusting the fluidity of the molten iron, and the molding is not good. Therefore, in the powder of the core of the present embodiment, the content of barium fluoride is 40 to 50 wt% and the content of rutile is 10 to 17 wt%, and the fluidity of the molten iron can be adjusted, so that the weld metal is well formed when being welded at all positions.
The aluminum powder adopted in the flux-cored powder of the embodiment is an important deoxidizer in a self-shielded welding wire, if the content of aluminum in deposited metal is increased, the content of oxygen and nitrogen is obviously reduced, and the anti-porosity performance is obviously improved. Aluminum is effective in reducing the susceptibility of weld porosity, the main reason for this is its very strong deoxidizing capacity. On the other hand, aluminum and nitrogen have strong binding force, stable nitride can be formed, the nitride is insoluble in weld metal and is melted in slag, and a certain amount of aluminum can ensure the anti-porosity performance. Therefore, the addition amount of the magnesium-aluminum alloy in the embodiment is 4-7 wt% of the powder of the explosive core, so that the oxygen content and the nitrogen content in the deposited metal can be effectively reduced, and the porosity resistance can be obviously improved.
The sodium fluoroaluminate adopted in the powder core of the specific embodiment can be dehydrogenated, and proper addition can also play roles in stabilizing electric arc and slagging. Therefore, the sodium fluoroaluminate in the embodiment is added in an amount of 2-6 wt% of the powder core, and can be used for dehydrogenation, electric arc stabilization and slagging.
The self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel prepared by the specific embodiment is suitable for self-protection welding of the ultralow-temperature high-manganese steel, and weld metal forms a full austenite structure, so that high ultralow-temperature toughness is ensured, and impact energy A at-196 ℃ is highkv95 to 137J; sufficient strength is also ensured: the yield strength is 420-490 MPa, the tensile strength is 615-713 MPa, the elongation A is 33-45%, and the mechanical property requirement and the ultra-low temperature toughness requirement of the ultra-low temperature high manganese steel at the working temperature of-196 ℃ are met.
Therefore, the weld metal formed by the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel prepared by the embodiment is good in forming and excellent in low-temperature toughness, the strength of the weld metal is matched with that of the ultralow-temperature high-manganese steel, and the self-protection flux-cored wire is particularly suitable for the technical requirements of the strength and the ultralow-temperature toughness of an LNG storage tank at the working temperature of-196 ℃.

Claims (5)

1. The utility model provides a self preservation protects flux cored wire suitable for ultra-low temperature high manganese steel which characterized in that: the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel consists of a carbon steel strip, a single-strand alloy welding wire and flux-cored powder, wherein the flux-cored powder is filled between the single-strand alloy welding wire and the carbon steel strip, and the center line of the single-strand alloy welding wire is superposed with the center line of the carbon steel strip;
the carbon steel strip comprises the following chemical components: 0.03 to 0.05 wt% of C, 0.05 to 0.08 wt% of Si, 0.5 to 0.8 wt% of Mn, not more than 0.005 wt% of P, not more than 0.005 wt% of S, and the balance of Fe and inevitable impurities;
the single-strand alloy welding wire comprises the following chemical components: 0.3 to 0.6 wt% of C, 0.05 to 0.2 wt% of Si, 24 to 33 wt% of Mn, not more than 0.003 wt% of P, not more than 0.003 wt% of S, 4 to 7 wt% of Ni, and the balance of Fe and inevitable impurities;
the chemical components of the medicine core powder are as follows: 40-50 wt% of barium fluoride, 10-17 wt% of rutile, 4-7 wt% of aluminum powder, 2-6 wt% of sodium fluoroaluminate, and the balance of Fe and inevitable impurities;
the preparation method of the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel comprises the following steps: the self-protection flux-cored wire suitable for the ultralow-temperature high-manganese steel is prepared by adopting a butt joint O-shaped sealing mode and through drawing, forming and reducing.
2. The self-shielded flux-cored wire suitable for ultralow temperature high manganese steel according to claim 1, wherein the purity of barium fluoride is more than or equal to 99%; the particle size of the barium fluoride is 0.15-0.20 mm.
3. The self-shielded flux-cored wire suitable for ultralow temperature high manganese steel according to claim 1, wherein the purity of rutile is more than or equal to 98%; the particle size of the rutile is 0.15-0.25 mm.
4. The self-shielded flux-cored wire suitable for the ultralow-temperature high-manganese steel according to claim 1, wherein the purity of the aluminum powder is more than or equal to 99%; the granularity of the aluminum powder is less than or equal to 0.30 mm.
5. The self-shielded flux-cored wire suitable for ultralow temperature high manganese steel according to claim 1, wherein the purity of the sodium fluoroaluminate is more than or equal to 99%; the granularity of the sodium fluoroaluminate is 0.15-0.20 mm.
CN202111622844.6A 2021-12-28 2021-12-28 Self-protection flux-cored wire applicable to ultralow-temperature high-manganese steel Active CN114131243B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111622844.6A CN114131243B (en) 2021-12-28 2021-12-28 Self-protection flux-cored wire applicable to ultralow-temperature high-manganese steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111622844.6A CN114131243B (en) 2021-12-28 2021-12-28 Self-protection flux-cored wire applicable to ultralow-temperature high-manganese steel

Publications (2)

Publication Number Publication Date
CN114131243A true CN114131243A (en) 2022-03-04
CN114131243B CN114131243B (en) 2023-06-02

Family

ID=80383592

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111622844.6A Active CN114131243B (en) 2021-12-28 2021-12-28 Self-protection flux-cored wire applicable to ultralow-temperature high-manganese steel

Country Status (1)

Country Link
CN (1) CN114131243B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160271736A1 (en) * 2012-11-22 2016-09-22 Posco Welded joint of extremely low-temperature steel, and welding materials for preparing same
CN107009046A (en) * 2017-03-28 2017-08-04 武汉科技大学 The tungsten argon arc welding solid core welding wire welded for ultralow temperature potassium steel
CN107378311A (en) * 2017-08-21 2017-11-24 洛阳双瑞特种合金材料有限公司 A kind of high tenacity for 460MPa steel is seamless submerged arc flux-cored wire
CN110181199A (en) * 2019-06-17 2019-08-30 武汉科技大学 A kind of high nitrogen armour steel self-protection flux-cored wire suitable for all-position welding
CN111702371A (en) * 2020-06-28 2020-09-25 昆山京群焊材科技有限公司 Ultralow-hydrogen acidic flux-cored wire and production method thereof
CN112894198A (en) * 2021-01-20 2021-06-04 浙江鸿途焊接科技有限公司 Self-protection flux-cored wire for ultralow-temperature high-manganese steel
CN113458654A (en) * 2021-06-30 2021-10-01 南京钢铁股份有限公司 Ultralow-temperature high-manganese steel welding wire, welding rod and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160271736A1 (en) * 2012-11-22 2016-09-22 Posco Welded joint of extremely low-temperature steel, and welding materials for preparing same
CN107009046A (en) * 2017-03-28 2017-08-04 武汉科技大学 The tungsten argon arc welding solid core welding wire welded for ultralow temperature potassium steel
CN107378311A (en) * 2017-08-21 2017-11-24 洛阳双瑞特种合金材料有限公司 A kind of high tenacity for 460MPa steel is seamless submerged arc flux-cored wire
CN110181199A (en) * 2019-06-17 2019-08-30 武汉科技大学 A kind of high nitrogen armour steel self-protection flux-cored wire suitable for all-position welding
CN111702371A (en) * 2020-06-28 2020-09-25 昆山京群焊材科技有限公司 Ultralow-hydrogen acidic flux-cored wire and production method thereof
CN112894198A (en) * 2021-01-20 2021-06-04 浙江鸿途焊接科技有限公司 Self-protection flux-cored wire for ultralow-temperature high-manganese steel
CN113458654A (en) * 2021-06-30 2021-10-01 南京钢铁股份有限公司 Ultralow-temperature high-manganese steel welding wire, welding rod and preparation method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
孟亮，王红鸿，陈亚魁，孟庆润，汪昌红: "LNG用高锰钢熔敷金属低温冲击韧性研究", 《电焊机》 *
***，亢淑梅，李顺涛: "超低温高锰钢焊接技术发展及在LNG储罐中的应用", 《科技创新与应用》 *

Also Published As

Publication number Publication date
CN114131243B (en) 2023-06-02

Similar Documents

Publication Publication Date Title
US9156112B2 (en) Welding solid wire and weld metal
CN110181199B (en) Self-protection flux-cored wire suitable for all-position welding for high-nitrogen armored steel
EP3838474A1 (en) Solid wire for gas metal arc welding
CN109623199B (en) Consumable electrode gas shielded welding metal powder core flux-cored wire for ultralow-temperature high-manganese steel
CN112894198A (en) Self-protection flux-cored wire for ultralow-temperature high-manganese steel
CN108907504B (en) Metal powder cored flux-cored wire suitable for ultralow-temperature high-manganese steel and welding method
KR20100108268A (en) Low-hydrogen coated electrode
US9492894B2 (en) Flux-cored arc welding wire for providing superior toughness and weldability to a welded joint at a low temperature, and welded joint using same
CN112171109A (en) Full-automatic submerged-arc welding solid-core welding wire for nickel-saving high-manganese low-temperature steel
US20240051070A1 (en) Submerged arc welded joint
CN103464930B (en) Welding wire and solder flux and the application thereof for submerged arc welding of a kind of 9Ni low-temperature steel
EP4159884A1 (en) Solid wire for gas metal arc welding use
CN102489895B (en) Gas protective flux cored wire for welding vanadium-containing heat resistant steel
CN112894199A (en) Consumable electrode gas shielded welding flux-cored wire for ultralow-temperature high manganese steel
CN108907505B (en) Special welding wire for Q550MPa high-strength steel and preparation method thereof
CN112404795B (en) Seamless self-protection flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel
US20240058900A1 (en) Wire rod for gas shielded welding wire and welding wire
CN110181197B (en) High-nitrogen metal powder-cored flux-cored wire suitable for welding high-nitrogen armored steel
CN114131243A (en) Self-protection flux-cored wire suitable for ultralow-temperature high-manganese steel
CN114161024B (en) Metal powder type flux-cored wire and preparation method and application thereof
CN112404794B (en) Manual arc welding electrode for welding low-nitrogen non-magnetic naval vessel steel
EP4257281A1 (en) Tig welding joint
KR101647148B1 (en) Flux cored arc weld wire for high tensile steel and weld metal joint using the same
CN112404796B (en) Seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel
CN115008066B (en) Self-protection flux-cored wire for weathering steel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant