CN116586823B - Welding wire molten steel and welding wire for welding medium-pressure hydrogen transmission pipeline and preparation method thereof - Google Patents
Welding wire molten steel and welding wire for welding medium-pressure hydrogen transmission pipeline and preparation method thereof Download PDFInfo
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- CN116586823B CN116586823B CN202310868374.4A CN202310868374A CN116586823B CN 116586823 B CN116586823 B CN 116586823B CN 202310868374 A CN202310868374 A CN 202310868374A CN 116586823 B CN116586823 B CN 116586823B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 135
- 239000010959 steel Substances 0.000 title claims abstract description 135
- 238000003466 welding Methods 0.000 title claims abstract description 88
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 84
- 239000001257 hydrogen Substances 0.000 title claims abstract description 84
- 230000005540 biological transmission Effects 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 125000004435 hydrogen atom Chemical class [H]* 0.000 title 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 27
- 238000003723 Smelting Methods 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 238000005242 forging Methods 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 15
- 230000006698 induction Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 23
- 238000004321 preservation Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 13
- 238000005498 polishing Methods 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000007747 plating Methods 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 5
- 239000002184 metal Substances 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 9
- 239000000956 alloy Substances 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 230000003993 interaction Effects 0.000 abstract description 5
- 241001062472 Stokellia anisodon Species 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 17
- 230000007547 defect Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 239000002932 luster Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000746 purification Methods 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
- B23K35/40—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
- B23K35/22—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
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to the field of smelting and wire preparation, and discloses welding wire molten steel and a welding wire for welding a medium-pressure hydrogen transmission pipeline and a preparation method thereof, wherein the preparation method comprises the steps of adopting a vacuum induction smelting furnace to smelt molten steel and preparing steel ingots by using the molten steel; forging the steel ingot to obtain a steel billet; rolling the steel billet into a wire rod; and drawing, reducing and layer winding are carried out on the wire rod, so that a finished product is obtained. According to the invention, through optimizing each alloy component element of molten steel, each element reaches a certain proportion and interaction, the performance of deposited metal after welding can be kept in a stable range, so that the joint welded by the welding wire has good hydrogen compatibility and hydrogen embrittlement resistance, and the joint meets the requirements of hydrogen embrittlement resistance and strength welding of a medium-pressure hydrogen transmission pipeline.
Description
Technical Field
The invention belongs to the field of smelting and wire preparation, and particularly relates to welding wire molten steel and welding wire for welding a medium-pressure hydrogen transmission pipeline and a preparation method thereof.
Background
At present, the main modes of hydrogen energy transportation comprise high-pressure hydrogen cylinder long pipe trailer transportation, liquid hydrogen tank truck transportation and liquid hydrogen barge transportation, the transportation cost is higher and the efficiency is lower, and the utilization of in-service natural gas pipelines or newly-built pipelines as hydrogen transportation pipelines is the best way for large-scale economic transportation and utilization of hydrogen energy in the future.
The technology of transporting hydrogen through pipelines at present in China comprises the following steps: 202110654808.1A medium-pressure hydrogen-containing pipeline experiment system and method, 202011477933.1 a hydrogen-doped natural gas transportation and separation system and control method thereof, 202011634936.1 a pure hydrogen transportation and distribution pipe network system and control method thereof and the like are adopted, the prior art only designs the processes of mixing, transportation, distribution, separation and purification technologies in the transportation process of the hydrogen-doped pipeline or the pure hydrogen pipeline, and along with the progress of smelting technology, the hydrogen embrittlement resistance of the steel material is greatly improved, and the requirement of medium-pressure hydrogen transportation can be met in the middle pressure.
The medium-pressure hydrogen transmission pipeline is a pipeline with the pressure of more than 0.01MPa and less than 0.4MPa and the hydrogen concentration of not less than 98%, the requirement can be met by using a pipeline with the tensile strength of more than 490MPa, and the welding wire with the excessively high tensile strength is not suitable for welding the medium-pressure hydrogen transmission pipeline from the aspects of economy and matching with the pipeline strength, and on the other hand, whether the existing welding wire can be used in a hydrogen-containing environment or not is theoretically supported by related patents and experiments.
Therefore, in order to realize the large-scale safe application of the hydrogen conveying pipeline, it is necessary to provide a welding wire which meets the requirement of the medium-pressure hydrogen conveying pipeline on the compatibility and the hydrogen embrittlement resistance of hydrogen and has the mechanical property of deposited metal adapted to the medium-pressure hydrogen conveying pipeline.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a welding wire molten steel and a welding wire for welding a medium-pressure hydrogen transmission pipeline and a preparation method thereof, wherein through optimizing each alloy component element of the molten steel and enabling each element to reach a certain proportion and interaction, the performance of deposited metal after welding can be kept in a stable range (slightly more than 490 MPa), so that a joint welded by the welding wire has good hydrogen compatibility and hydrogen embrittlement resistance, the welding strength and the hydrogen embrittlement resistance requirement of the medium-pressure hydrogen transmission pipeline are adapted, the molten steel is smelted by using a vacuum induction furnace, and the smelted molten steel is prepared into the welding wire through forging, rolling and drawing.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the welding wire molten steel for the medium-pressure hydrogen transmission pipeline welding comprises the following components in percentage by mass: 0.08 to 0.12 percent of C,1.2 to 1.5 percent of Si,1.8 to 2.2 percent of Mn, not more than 0.015 percent of P, not more than 0.010 percent of S,0.10 to 0.20 percent of Cr,0.15 to 0.35 percent of Mo,0.15 to 0.25 percent of Ni,0.05 to 0.10 percent of Nb, and the balance of Fe and impurities.
In a second aspect, the invention also discloses a preparation method of the welding wire for welding the medium-pressure hydrogen transmission pipeline, which comprises the following steps:
smelting molten steel by adopting a vacuum induction smelting furnace, and preparing a steel ingot by utilizing the molten steel;
forging the steel ingot to obtain a steel billet;
rolling the steel billet into a wire rod;
drawing, reducing and layer winding are carried out on the wire rod, and a finished product is obtained;
wherein, the mass percentages of the components in the molten steel are as follows: 0.08 to 0.12 percent of C,1.2 to 1.5 percent of Si,1.8 to 2.2 percent of Mn, not more than 0.015 percent of P, not more than 0.010 percent of S,0.10 to 0.20 percent of Cr,0.15 to 0.35 percent of Mo,0.15 to 0.25 percent of Ni,0.05 to 0.10 percent of Nb, and the balance of Fe and impurities.
Further, smelting molten steel by using a vacuum induction smelting furnace, and preparing a steel ingot by using the molten steel, wherein the method comprises the following steps:
the temperature of molten steel is adjusted to 1560-1580 ℃;
pouring the molten steel with the adjusted temperature into an ingot mould to form a steel ingot.
Further, forging the steel ingot to obtain a steel billet, including:
and polishing the surface of the steel ingot.
Further, forging the steel ingot to obtain a steel billet, and further comprising:
heating and preserving heat of the polished steel ingot, wherein the temperature of the heat preservation is 1080-1150 ℃, and the time of the heat preservation is not less than two hours;
forging the heat-preserving steel ingot into a steel billet.
Further, rolling the billet into a wire rod, comprising:
and polishing the surface of the steel billet.
Further, rolling the billet into a wire rod, further comprising:
heating and preserving heat of the polished steel billet, wherein the temperature of the heat preservation is 1080-1130 ℃, and the time of the heat preservation is not less than two hours;
rolling the heat-preserving billet into a wire rod with a preset size;
and (5) putting the wire rod into a sand pit for cooling.
Further, drawing and reducing and layer winding are carried out on the wire rod to obtain a finished product, and the method comprises the following steps:
and drawing the wire rod to a preset size by adopting a die, cleaning the surface of the drawn wire rod, and plating copper to a preset finished product size.
Further, the wire rod is drawn, reduced and wound in layers to obtain a finished product, and the method further comprises the following steps:
and drawing the wire rod to phi 1.23mm by adopting a die, cleaning the surface of the drawn wire rod, plating copper to phi 1.20mm, and carrying out layer winding treatment on the wire rod plated with copper to obtain a finished product.
In a third aspect, the invention also discloses a welding wire for welding the medium-pressure hydrogen transmission pipeline, which is prepared by adopting the method.
The invention has the technical effects and advantages that:
1. according to the invention, through optimizing each alloy component element of molten steel, each element reaches a certain proportion and interaction, the performance of deposited metal after welding can be ensured to be kept in a stable range (the tensile strength is slightly more than 490 MPa), so that the joint welded by the welding wire has good hydrogen compatibility and hydrogen embrittlement resistance, and is suitable for the welding requirement of a medium-pressure hydrogen transmission pipeline.
2. According to the invention, the vacuum induction melting furnace is used for melting molten steel, so that the purity of the molten steel and the accurate control of components are ensured, and the content of gas elements can be controlled at a lower level.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a flow chart of a method for preparing a welding wire for welding a medium-pressure hydrogen transmission pipeline.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a welding wire for welding a medium-pressure hydrogen transmission pipeline, which comprises the following components in mass percent: the invention optimizes each alloy component element of molten steel and simultaneously ensures each element to reach a certain proportion and interaction, can ensure that the performance of deposited metal after welding is kept in a stable range (the tensile strength is slightly more than 490 MPa), and ensures that the joint welded by the welding wire has good hydrogen compatibility and hydrogen embrittlement resistance and is suitable for the welding requirement of a medium-pressure hydrogen transmission pipeline.
In a second aspect, as shown in fig. 1, the present invention provides a method for preparing a welding wire for welding a medium-pressure hydrogen-transporting pipeline, comprising:
smelting molten steel by adopting a vacuum induction smelting furnace, and preparing a steel ingot by utilizing the molten steel;
forging the steel ingot to obtain a steel billet;
rolling the steel billet into a wire rod;
drawing and reducing the wire rod to obtain a finished product;
wherein, the mass percentages of the components in the molten steel are as follows: 0.08 to 0.12 percent of C,1.2 to 1.5 percent of Si,1.8 to 2.2 percent of Mn, not more than 0.015 percent of P, not more than 0.010 percent of S,0.10 to 0.20 percent of Cr,0.15 to 0.35 percent of Mo,0.15 to 0.25 percent of Ni,0.05 to 0.10 percent of Nb, and the balance of Fe and impurities.
In some embodiments of the present invention, a vacuum induction melting furnace is used to smelt molten steel, and steel ingots are prepared from the molten steel, comprising:
the temperature of molten steel is adjusted to 1560-1580 ℃;
pouring the molten steel with the adjusted temperature into an ingot mould to form a steel ingot.
In some embodiments of the invention, forging a steel ingot to obtain a steel billet comprises:
polishing the surface of the steel ingot until the surface of the steel ingot has metallic luster and no macroscopic defect.
In some embodiments of the present invention, forging the steel ingot to obtain a steel ingot further comprises:
heating and preserving heat of the polished steel ingot, wherein the temperature of the heat preservation is 1080-1150 ℃, and the time of the heat preservation is not less than two hours;
forging the heat-preserving steel ingot into a steel billet.
In some embodiments of the invention, rolling a billet into a wire rod comprises:
polishing the surface of the steel billet until the surface of the steel ingot has metallic luster and no macroscopic defect.
In some embodiments of the invention, rolling the billet into a wire rod further comprises:
heating and preserving heat of the polished steel billet, wherein the preserving heat temperature is 1080-1130 ℃, and the preserving heat time is not less than two hours;
rolling the heat-preserving billet into a wire rod with a preset size;
and (5) putting the wire rod into a sand pit for cooling.
In some embodiments of the present invention, drawing reducing and layer winding are performed on a wire rod to obtain a finished product, including:
and drawing the wire rod to a preset size by adopting a die, cleaning the surface of the drawn wire rod, plating copper to a preset finished product size, and carrying out layer winding treatment on the wire rod plated with copper to obtain a finished product.
In some embodiments of the present invention, the wire rod is drawn, reduced and wound to obtain a finished product, and the method further includes:
and drawing the wire rod to phi 1.23mm by adopting a die, cleaning the surface of the drawn wire rod, plating copper to phi 1.20mm, and carrying out layer winding treatment on the wire rod plated with copper to obtain a finished product.
In a third aspect, the invention also discloses a welding wire for welding the medium-pressure hydrogen transmission pipeline, which is prepared by adopting the method.
For a better understanding of the present solution, the present invention also provides the following examples.
Example 1
S1, smelting by adopting a vacuum induction smelting furnace, and adjusting the molten steel to the following components in percentage by weight: 0.085% C,1.3% Si,1.9% Mn,0.008% P,0.006% S,0.10% Cr,0.15% Mo,0.15% Ni,0.05% Nb, and the balance Fe and impurities. After the composition of the molten steel is adjusted, the temperature of the molten steel is adjusted to 1570 ℃, and then the molten steel is poured into a pre-prepared ingot mould to prepare a steel ingot.
S2, after the steel ingot is cooled, sawing a riser of the steel ingot, polishing the surface of the steel ingot to metallic luster and no macroscopic defect, and then placing the steel ingot into a heating furnace for heating, wherein the heat preservation temperature is 1080 ℃ and the heat preservation time is two hours. And forging the steel billet by adopting a hydraulic forging machine.
And S3, polishing the surface of the forged billet until the surface is metallic and has no macroscopic defect, and then putting the billet into a heating furnace for heating, wherein the heat preservation temperature is 1080 ℃ and the heat preservation time is two hours. And then rolling the steel billet into a wire rod with the nominal size phi of 6.50mm by adopting a continuous rolling mill, and putting the rolled wire rod into a sand pit for slow cooling.
And S4, drawing and reducing the wire rod by adopting a fixed die, cleaning the surface of the wire rod when the wire rod is drawn to phi 1.23mm, plating copper to phi 1.20mm, and then layering and winding to obtain a finished product.
The welding wire prepared by the embodiment is used for welding a deposited test plate, the mechanical properties of deposited metal are shown in table 1, the tensile strength of a welded joint welded by the welding wire is 520MPa, and is slightly more than 490MPa, so that the welding strength requirement of a medium-pressure hydrogen transmission pipeline is met.
TABLE 1
Reference to ISO 11114-4-2005 section 4 for compatibility of mobile cylinder and cylinder valve materials with gas: the method A in the standard of the test method for selecting the hydrogen embrittlement resistant metal material tests the welding joint, and the hydrogen embrittlement index i is 1.38 (when i=1, the material does not have hydrogen embrittlement, and is 1 < i.ltoreq.2, the material has certain hydrogen embrittlement resistance, and when i is greater than 2, the material has serious hydrogen embrittlement resistance), so that the material has the hydrogen embrittlement resistance and can be used in corresponding hydrogen environment.
Example 2
S1, smelting by adopting a vacuum induction smelting furnace, and adjusting the molten steel to the following components in percentage by weight: 0.10% of C,1.3% of Si,2.0% of Mn,0.007% of P,0.005% of S,0.16% of Cr,0.20% of Mo,0.20% of Ni,0.08% of Nb, and the balance of Fe and impurities. After the composition of the molten steel is adjusted, the temperature of the molten steel is adjusted to 1570 ℃, and then the molten steel is poured into a pre-prepared ingot mould to prepare a steel ingot.
S2, after the steel ingot is cooled, sawing a riser of the steel ingot, polishing the surface of the steel ingot to metallic luster and no macroscopic defect, and then putting the steel ingot into a heating furnace for heating, wherein the heat preservation temperature is 1100 ℃, and the heat preservation time is not less than 2.5 hours. And forging the steel billet by adopting a hydraulic forging machine.
And S3, polishing the surface of the forged billet until the surface is metallic and has no macroscopic defect, and then placing the billet into a heating furnace for heating, wherein the heat preservation temperature is 1100 ℃, and the heat preservation time is not less than 2.5 hours. And then rolling the steel billet into a wire rod with the nominal size phi of 6.50mm by adopting a continuous rolling mill, and putting the rolled wire rod into a sand pit for slow cooling.
And S4, drawing and reducing the wire rod by adopting a fixed die, cleaning the surface of the wire rod when the wire rod is drawn to phi 1.23mm, plating copper to phi 1.20mm, and then layering and winding to obtain a finished product.
The welding wire prepared by the embodiment is used for cladding test plate welding, the mechanical properties of deposited metal are shown in table 2, the tensile strength of a welded joint welded by the welding wire is 540MPa, is slightly more than 490MPa, and meets the welding strength requirement of a medium-pressure hydrogen transmission pipeline.
TABLE 2
Reference to ISO 11114-4-2005 section 4 for compatibility of mobile cylinder and cylinder valve materials with gas: the method A in the standard of the test method for selecting the hydrogen embrittlement resistant metal material tests the welding joint, and the hydrogen embrittlement index i is 1.46 (when i=1, the material does not have hydrogen embrittlement, and is 1 < i.ltoreq.2, the material has certain hydrogen embrittlement resistance, and when i is greater than 2, the material has serious hydrogen embrittlement resistance), so that the material has the hydrogen embrittlement resistance and can be used in corresponding hydrogen environment.
Example 3
S1, smelting by adopting a vacuum induction smelting furnace, and adjusting the molten steel to the following components in percentage by weight: 0.11% of C,1.4% of Si,2.1% of Mn,0.006% of P,0.006% of S,0.20% of Cr,0.28% of Mo,0.20% of Ni,0.10% of Nb, and the balance of Fe and impurities. After the composition adjustment of the molten steel is completed, the temperature of the molten steel is adjusted to 1580 ℃, and then the molten steel is poured into a pre-prepared ingot mould to prepare a steel ingot.
S2, after the steel ingot is cooled, sawing a riser of the steel ingot, polishing the surface of the steel ingot to metallic luster and no macroscopic defect, and then placing the steel ingot into a heating furnace for heating, wherein the heat preservation temperature is 1140 ℃, and the heat preservation time is not less than 2.5 hours. And forging the steel billet by adopting a hydraulic forging machine.
And S3, polishing the surface of the forged billet until the surface is metallic and has no macroscopic defect, and then putting the billet into a heating furnace for heating, wherein the heat preservation temperature is 1120 ℃, and the heat preservation time is not less than 2.5 hours. And then rolling the steel billet into a wire rod with the nominal size phi of 6.50mm by adopting a continuous rolling mill, and putting the rolled wire rod into a sand pit for slow cooling.
And S4, drawing and reducing the wire rod by adopting a fixed die, cleaning the surface of the wire rod when the wire rod is drawn to phi 1.23mm, plating copper to phi 1.20mm, and then layering and winding to obtain a finished product.
The welding wire prepared by the embodiment is used for welding a deposited test plate, the mechanical properties of deposited metal are shown in table 3, the tensile strength of a welded joint welded by the welding wire is 585MPa, is slightly more than 490MPa, and meets the welding strength requirement of a medium-pressure hydrogen transmission pipeline.
TABLE 3 Table 3
Reference to ISO 11114-4-2005 section 4 for compatibility of mobile cylinder and cylinder valve materials with gas: the method A in the standard of the test method for selecting the hydrogen embrittlement resistant metal material tests the welding joint, and the hydrogen embrittlement index i is 1.58 (when i=1, the material does not have hydrogen embrittlement, and is 1 < i.ltoreq.2, the material has certain hydrogen embrittlement resistance, and when i is greater than 2, the material has serious hydrogen embrittlement resistance), so that the material has the hydrogen embrittlement resistance and can be used in corresponding hydrogen environment.
The invention also carries out a hydrogen embrittlement comparison test on ER50-6 welding wires with the maximum dosage on the market and similar tensile strength to the welding wires, and the hydrogen embrittlement index i of a welding joint welded by the ER50-6 welding wires is 2.82, which indicates that the material has serious hydrogen embrittlement and can not be used in a hydrogen environment.
In summary, the invention optimizes the alloy component elements of the molten steel, and simultaneously ensures that the elements reach a certain proportion and interaction, thereby ensuring that the performance of the deposited metal after welding is kept in a stable range (slightly more than 490 MPa), leading the joint welded by the welding wire to have good hydrogen compatibility and hydrogen embrittlement resistance, and adapting to the welding strength and hydrogen embrittlement resistance requirements of a medium-pressure hydrogen transmission pipeline.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. The preparation method of the welding wire for welding the medium-pressure hydrogen transmission pipeline is characterized by comprising the following steps of:
smelting molten steel by adopting a vacuum induction smelting furnace, and preparing a steel ingot by utilizing the molten steel;
forging the steel ingot to obtain a steel billet;
rolling the steel billet into a wire rod;
drawing, reducing and layer winding are carried out on the wire rod, and a finished product is obtained;
wherein, the mass percentages of each component in the molten steel are as follows: 0.08 to 0.12 percent of C,1.2 to 1.5 percent of Si,1.8 to 2.2 percent of Mn, not more than 0.015 percent of P, not more than 0.010 percent of S,0.10 to 0.20 percent of Cr,0.15 to 0.35 percent of Mo,0.15 to 0.25 percent of Ni,0.05 to 0.10 percent of Nb, and the balance of Fe and impurities.
2. The method for preparing a welding wire for welding a medium-pressure hydrogen pipeline according to claim 1, wherein the step of smelting molten steel by using a vacuum induction melting furnace and preparing a steel ingot by using the molten steel comprises the steps of:
the temperature of the molten steel is adjusted to 1560-1580 ℃;
pouring the molten steel with the adjusted temperature into an ingot mould to form a steel ingot.
3. The method for producing a welding wire for welding a medium pressure hydrogen transfer pipe according to claim 1, wherein forging the steel ingot to obtain a steel billet comprises:
and polishing the surface of the steel ingot.
4. The method for producing a welding wire for welding a medium pressure hydrogen transfer pipe according to claim 3, wherein the steel ingot is forged to obtain a steel billet, further comprising:
heating and preserving the polished steel ingot, wherein the preserving temperature is 1080-1150 ℃, and the preserving time is not less than two hours;
forging the steel ingot after heat preservation into a steel billet.
5. The method for manufacturing a welding wire for welding a medium-pressure hydrogen-transporting pipe according to claim 1, wherein said rolling said steel billet into a wire rod comprises:
and polishing the surface of the steel billet.
6. The method for manufacturing a welding wire for welding a medium-pressure hydrogen pipeline according to claim 5, wherein the rolling the billet into a wire rod further comprises:
heating and preserving heat of the polished steel billet, wherein the preserving heat temperature is 1080-1130 ℃, and the preserving heat time is not less than two hours;
rolling the heat-preserved steel billet into a wire rod with a preset size;
and (5) placing the wire rod into a sand pit for cooling.
7. The method for preparing a welding wire for welding a medium-pressure hydrogen-transporting pipeline according to claim 1, wherein the drawing reducing and layer winding are performed on the wire rod to obtain a finished product, and the method comprises the following steps:
and drawing the wire rod to a preset size by adopting a die, cleaning the surface of the drawn wire rod, and plating copper to a preset finished product size.
8. The method for manufacturing a welding wire for welding a medium-pressure hydrogen-transporting pipeline according to claim 7, wherein the drawing reducing and layer winding are performed on the wire rod to obtain a finished product, further comprising:
and drawing the wire rod to phi 1.23mm by adopting a die, cleaning the surface of the drawn wire rod, plating copper to phi 1.20mm, and carrying out layer winding treatment on the wire rod plated with copper to obtain a finished product.
9. A welding wire for welding a medium-pressure hydrogen transmission pipeline is characterized in that the welding wire is prepared by adopting the method of any one of claims 1-8,
the mass percentages of the components in the molten steel for preparing the welding wire are as follows: 0.08 to 0.12 percent of C,1.2 to 1.5 percent of Si,1.8 to 2.2 percent of Mn, not more than 0.015 percent of P, not more than 0.010 percent of S,0.10 to 0.20 percent of Cr,0.15 to 0.35 percent of Mo,0.15 to 0.25 percent of Ni,0.05 to 0.10 percent of Nb, and the balance of Fe and impurities,
smelting molten steel by adopting a vacuum induction smelting furnace, and preparing a steel ingot by utilizing the molten steel;
forging the steel ingot to obtain a steel billet;
rolling the steel billet into a wire rod;
and drawing, reducing and layer winding the wire rod to obtain a finished product.
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