CN116586819B - Welding wire molten steel and welding wire for welding low-pressure hydrogen transmission pipeline and preparation method thereof - Google Patents
Welding wire molten steel and welding wire for welding low-pressure hydrogen transmission pipeline and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 145
- 239000010959 steel Substances 0.000 title claims abstract description 145
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 89
- 239000001257 hydrogen Substances 0.000 title claims abstract description 89
- 238000003466 welding Methods 0.000 title claims abstract description 88
- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 125000004435 hydrogen atom Chemical class [H]* 0.000 title description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 27
- 238000003723 Smelting Methods 0.000 claims abstract description 23
- 238000005242 forging Methods 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 18
- 230000006698 induction Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 229910052802 copper Inorganic materials 0.000 claims description 15
- 239000010949 copper Substances 0.000 claims description 15
- 238000004321 preservation Methods 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
- 239000004576 sand Substances 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 5
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 239000000956 alloy Substances 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 4
- 241001062472 Stokellia anisodon Species 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 230000007547 defect Effects 0.000 description 10
- 239000011651 chromium Substances 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000002932 luster Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 238000009863 impact test Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 238000005516 engineering process 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance 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
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Extraction Processes (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 low-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 hydrogen embrittlement resistance and strength welding requirements of a low-pressure hydrogen transmission pipeline are met.
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 low-pressure hydrogen transmission pipeline and a preparation method thereof.
Background
The hydrogen energy has the characteristics of rich sources, green low carbon, wide application and the like, and the main mode of hydrogen energy transportation at present is high-pressure hydrogen cylinder long pipe trailer transportation, liquid hydrogen tank truck transportation and liquid hydrogen barge transportation, and the modes have higher transportation cost and lower efficiency. Because of wide distribution of natural gas pipe networks in China and large construction scale, the utilization of in-service natural gas pipelines or newly-built pipelines for transporting hydrogen is the best way for large-scale economic transportation and utilization of hydrogen energy in the future.
However, hydrogen has physical and chemical properties such as easy leakage, inflammability, explosiveness and the like, the pressure range of a pipeline is wide, the variety of pipeline materials is large, a series of new technology and safety problems can be generated when the hydrogen is conveyed through an in-service natural gas pipeline or a newly-built pipeline, and hydrogen atoms are taken as the lightest atoms, have extremely small atomic radius and are very easy to be taken as gap atoms to enter the metal material and diffuse in a crystal occupation array. There are a number of defects in steel (such as dislocations, grain boundaries, vacancies, precipitated phases, nonmetallic inclusions, etc.), which interact with the hydrogen strain field to attract hydrogen around itself due to the strain field around its turn. Then under the coupling action of various stresses and hydrogen, cracks are initiated to confuse and generate hydrogen bubbling, and the material is disabled.
With the continuous improvement of the domestic smelting level, the hydrogen embrittlement resistance of the steel material is greatly improved, particularly the continuous improvement of the purification smelting technology, the hydrogen compatibility and the hydrogen embrittlement resistance of the steel material can meet the requirement of low-pressure hydrogen transportation at low pressure, and the seamless pipe is welded to form a complete pipeline, so that whether the existing welding wire can be used in a hydrogen-containing environment or not is not theoretically supported by related patents and tests.
The low-pressure hydrogen delivery pipeline refers to a pipeline with the pressure of less than 0.01MPa and the hydrogen concentration of not less than 98 percent, and for the low-pressure hydrogen delivery pipeline (with the pressure of not more than 0.01 MPa), the pipeline with the tensile strength of more than 430MPa can be used, so that the requirement can be met, and the tensile strength of a welding wire is too high, and is unsuitable from the aspects of economy and matching with the pipeline strength.
Therefore, it is necessary to provide a welding wire which is compatible with hydrogen and resistant to hydrogen embrittlement, meets the requirement of a low-pressure hydrogen delivery pipeline, and has the mechanical properties of deposited metal adapted to the low-pressure hydrogen delivery pipeline.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a welding wire molten steel and a welding wire for welding a low-pressure hydrogen transmission pipeline and a preparation method thereof, wherein a vacuum induction furnace is used for smelting molten steel, nickel is added into the molten steel to increase the toughness of the molten steel, chromium and molybdenum are added to make the molten steel insensitive to hydrogen, and the content of other elements is regulated in an adaptive manner to enable the mechanical properties of deposited metal of the welding wire to be adaptive to the low-pressure hydrogen transmission pipeline, and then 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 low-pressure hydrogen transmission pipeline welding comprises the following components in percentage by mass: 0.06% -0.10% of C,0.4% -0.8% of Si,0.8% -1.4% of Mn, not more than 0.015% of P, not more than 0.010% of S,0.05% -0.15% of Cr,0.05% -0.15% of Mo,0.05% -0.15% of Ni, and the balance of Fe and impurities.
In a second aspect, the invention discloses a method for preparing a welding wire for welding a low-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: 0.06% -0.10% of C,0.4% -0.8% of Si,0.8% -1.4% of Mn, not more than 0.015% of P, not more than 0.010% of S,0.05% -0.15% of Cr,0.05% -0.15% of Mo,0.05% -0.15% of Ni, 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 1500-1560 ℃;
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 1050-1080 ℃, 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:
polishing the surface of the 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 1050-1080 ℃, 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, 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.
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 discloses a welding wire for welding a low-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 430 MPa), so that the joint welded by the welding wire has good hydrogen compatibility and hydrogen embrittlement resistance, and the welding requirement of a low-pressure hydrogen transmission pipeline is adapted.
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 low-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 low-pressure hydrogen transmission pipeline, which comprises the following components in percentage by mass in molten steel: the invention optimizes each alloy element of molten steel, adds nickel in the molten steel to increase the toughness, adds chromium and molybdenum to make the molten steel insensitive to hydrogen, and simultaneously makes each element reach a certain proportion and interaction, can ensure that the performance of deposited metal after welding is kept in a stable range, makes the welded joint of the welding wire have good hydrogen compatibility and hydrogen embrittlement resistance, and is suitable for the welding requirement of a low-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 low-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, 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: 0.06% -0.10% of C,0.4% -0.8% of Si,0.8% -1.4% of Mn, not more than 0.015% of P, not more than 0.010% of S,0.05% -0.15% of Cr,0.05% -0.15% of Mo,0.05% -0.15% of Ni, 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 1500-1560 ℃;
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 1050-1080 ℃, 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 the polished steel billet, wherein the preserving temperature is 1050-1080 ℃, and the preserving 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.
The invention also discloses a welding wire for welding the low-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: 0.06% of C,0.4% of Si,0.8% of Mn,0.008% of P,0.006% of S,0.05% of Cr,0.05% of Mo,0.05% of Ni, 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 1520 ℃, and then the molten steel is poured into a pre-prepared ingot mold 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 be metallic luster and free of macroscopic defects, putting the steel ingot into a heating furnace for heating, keeping the temperature at 1060 ℃ for two hours, and forging the steel ingot by adopting a hydraulic forging machine.
And S3, polishing the surface of the forged steel billet until the surface is metallic and has no macroscopic defect, then putting the steel billet into a heating furnace for heating, keeping the temperature at 1060 ℃ for two hours, adopting a continuous rolling mill to roll the steel billet into a wire rod with the nominal size phi of 6.50mm, 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 deposition test plate, a tensile test is carried out on a welded joint welded by the welding wire at room temperature, an impact test is carried out at-40 ℃, the mechanical properties of deposited metal are shown in a table 1, the tensile strength of the welded joint welded by the welding wire at room temperature is 475MPa, and is slightly more than 430MPa, so that the welding strength requirement of a low-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 1.45 (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: 0.08% of C,0.6% of Si,1.0% of Mn,0.007% of P,0.005% of S,0.10% of Cr,0.10% of Mo,0.10% of Ni, 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 1530 ℃, 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 be metallic luster and free of macroscopic defects, putting the steel ingot into a heating furnace for heating, keeping the temperature at 1080 ℃ for not less than 2.5 hours, and forging the steel ingot 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 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 deposition test plate, a tensile test is carried out on a welded joint welded by the welding wire at room temperature, an impact test is carried out at-40 ℃, the mechanical properties of deposited metal are shown in a table 2, and the tensile strength (Rm) of the welded joint welded by the welding wire at room temperature is 490MPa and slightly more than 430MPa, so that the welding strength requirement of a low-pressure hydrogen transmission pipeline is met.
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 1.52 (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: 0.09% C,0.8% Si,1.3% Mn,0.008% P,0.007% S,0.12% Cr,0.13% Mo,0.14% Ni, and the balance Fe and impurities. After the composition of the molten steel is adjusted, the temperature of the molten steel is adjusted to 1550 ℃, 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 1070 ℃ and the heat preservation time is three 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 1070 ℃ and the heat preservation time is three 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 deposition test plate, a tensile test is carried out on a welded joint welded by the welding wire at room temperature, an impact test is carried out at-40 ℃, the mechanical properties of deposited metal are shown in a table 3, the tensile strength (Rm) of the welded joint welded by the welding wire at room temperature is 505MPa and slightly more than 430MPa, and the welding strength requirement of a low-pressure hydrogen transmission pipeline is met.
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 1.68 (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 deposited metal of the welding wire, 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 each alloy component element of molten steel, adds nickel in the molten steel to increase the toughness, adds chromium and molybdenum to make the molten steel insensitive to hydrogen, and simultaneously makes each element reach a certain proportion and interaction, thus ensuring that the performance of deposited metal after welding is kept in a stable range, leading the welded joint of the welding wire to have good hydrogen compatibility and hydrogen embrittlement resistance, and adapting to the welding strength and the hydrogen embrittlement resistance requirement of a low-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 low-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: 0.06% -0.10% of C,0.4% -0.8% of Si,0.8% -1.4% of Mn, not more than 0.015% of P, not more than 0.010% of S,0.05% -0.15% of Cr,0.05% -0.15% of Mo,0.05% -0.15% of Ni, and the balance of Fe and impurities.
2. The method for preparing a welding wire for welding a low-pressure hydrogen pipeline according to claim 1, wherein the smelting of molten steel by a vacuum induction melting furnace and the preparation of steel ingots by using the molten steel comprises the following steps:
the temperature of the molten steel is adjusted to 1500-1560 ℃;
pouring the molten steel with the adjusted temperature into an ingot mould to form a steel ingot.
3. The method for manufacturing a welding wire for welding a low-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 manufacturing a welding wire for welding a low-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 1050-1080 ℃, 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 low-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 low-pressure hydrogen pipeline according to claim 5, wherein the rolling the billet into a wire rod further comprises:
heating and preserving the polished steel billet, wherein the preserving temperature is 1050-1080 ℃, and the preserving 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 low-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, 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.
8. The method for manufacturing a welding wire for welding a low-pressure hydrogen pipeline according to claim 7, wherein the drawing reducing and layer winding are performed on the wire rod to obtain a finished product, and the method further comprises:
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 low-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: 0.06 to 0.10 percent of C,0.4 to 0.8 percent of Si,0.8 to 1.4 percent of Mn, not more than 0.015 percent of P, not more than 0.010 percent of S,0.05 to 0.15 percent of Cr,0.05 to 0.15 percent of Mo,0.05 to 0.15 percent of Ni, 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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