CN113319469B - High-strength heat-resistant steel gas shielded welding wire and preparation method thereof - Google Patents

High-strength heat-resistant steel gas shielded welding wire and preparation method thereof Download PDF

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CN113319469B
CN113319469B CN202110731938.0A CN202110731938A CN113319469B CN 113319469 B CN113319469 B CN 113319469B CN 202110731938 A CN202110731938 A CN 202110731938A CN 113319469 B CN113319469 B CN 113319469B
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welding wire
resistant steel
steel
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CN113319469A (en
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刘运强
叶东
张文凤
宋小辉
刘忠
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Guilin University of Aerospace Technology
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    • 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
    • B23K35/308—Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • 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
    • 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

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  • Mechanical Engineering (AREA)
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Abstract

The invention relates to a high-strength heat-resistant steel gas shielded welding wire and a preparation method thereof, which are characterized in that the gas shielded welding wire comprises, by mass, 0.05-0.12% of C, 0.55-0.75% of Si, 1.5-2.0% of Mn, 0.02-0.05% of Ti, 0.4-0.8% of Mo, 0.5-2.0% of Cr, 0.5-1.5% of Nb, 0.1-0.4% of Zr, 0.01-0.05% of Co and 0.01-0.05% of La; the content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe. The gas shielded welding wire for high-strength heat-resistant steel has good comprehensive mechanical properties of deposited metal after welding, and meanwhile, a weld joint structure has high strength, high crack resistance and high toughness; it is suitable for welding structural members for manufacturing boilers, steam turbines, power machinery, industrial furnaces, aviation, petrochemical engineering and the like.

Description

High-strength heat-resistant steel gas shielded welding wire and preparation method thereof
Technical Field
The invention relates to the technical field of welding, in particular to a high-strength heat-resistant steel gas shielded welding wire and a preparation method thereof.
Background
The heat-resistant steel refers to alloy steel having high strength and good chemical stability at high temperature. It includes two types of oxidation resistant steel (or called high temperature non-peeling steel) and hot strength steel. Oxidation resistant steels generally require better chemical stability but are subject to lower loads. Hot strength steels require high temperature strength and corresponding oxidation resistance. Heat resistant steels are commonly used in the manufacture of components and parts for operation at high temperatures in boilers, turbines, power machinery, industrial furnaces and in the aviation, petrochemical and other industrial sectors. In addition to high-temperature strength and resistance to high-temperature oxidation corrosion, these components also require, depending on the application, adequate toughness, good workability and weldability, and a certain structural stability. The performance of heat resistant steel is developing towards high strength and high heat resistance to reduce material consumption, reduce structural weight, and improve structural performance and safety. This will put higher demands on the toughness of the heat-resistant steel welded joint, and further on the welding materials and welding process.
However, the development of the welding materials matched with the high-strength heat-resistant steel is relatively lagged at present, so that the popularization and the application of the high-strength heat-resistant steel are restricted. Meanwhile, the strength of the high-strength heat-resistant steel is continuously improved, and the welding problem is increasingly prominent, such as the serious problems that the high-strength heat-resistant steel welding joint is easy to have crack sensitivity and is increased, the performance of the joint area is deteriorated, and the like. Therefore, it is urgently required to develop a gas-shielded welding wire having high strength, heat resistance and good crack resistance, which has excellent welding manufacturability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the high-strength heat-resistant steel gas shielded welding wire which has good comprehensive mechanical properties of welding wire deposited metal and high-strength, high-crack-resistance and high-toughness weld joint tissues, and the preparation method thereof, and is suitable for welding structural members for manufacturing boilers, steam turbines, power machinery, industrial furnaces, aviation, petrochemical industry and the like.
The invention is realized by the following steps:
a high-strength heat-resistant steel gas shielded welding wire comprises the following chemical elements in percentage by mass:
0.05 to 0.12 percent of C, 0.55 to 0.75 percent of Si, 1.5 to 2.0 percent of Mn, 0.02 to 0.05 percent of Ti, 0.4 to 0.8 percent of Mo, 0.5 to 2.0 percent of Cr, 0.5 to 1.5 percent of Nb, 0.1 to 0.4 percent of Zr, 0.01 to 0.05 percent of Co and 0.01 to 0.05 percent of La; the single content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe.
Further preferably, the high-strength heat-resistant steel gas shielded welding wire comprises the following chemical elements in percentage by mass:
0.06 to 0.08 percent of C, 0.60 to 0.70 percent of Si, 1.8 to 2.0 percent of Mn, 0.03 to 0.04 percent of Ti, 0.4 to 0.8 percent of Mo, 0.5 to 2.0 percent of Cr, 0.5 to 1.5 percent of Nb, 0.2 to 0.3 percent of Zr, 0.02 to 0.04 percent of Co and 0.02 to 0.04 percent of La; the content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe.
The main functions of the chemical components of the invention are as follows: c can improve the strength of a welding structure, but is also a brittle element in a high-strength heat-resistant steel welding seam, and influences the crack resistance and impact toughness of the welding seam metal; si is used as a deoxidizing element, can prevent iron from being combined with oxygen, and can reduce FeO in a molten pool; mn is a good deoxidizer and can improve the strength and the wear resistance of a weld structure; ti is a strong deoxidizing element, can refine grains and improve welding performance; mo can improve the high-temperature strength, the wear resistance, the creep strength and the endurance strength of a weld joint structure and improve the corrosion resistance of the weld joint structure; cr can improve the strength and hardness of a weld structure, but the plasticity and toughness are not greatly reduced, so that the Cr has strong corrosion resistance and acid resistance; nb can refine grains, reduce the overheating sensitivity and the tempering brittleness of deposited metal and improve the strength; zr can improve the low-temperature impact toughness and the impact toughness stability of the deposited metal; co can improve the heat resistance and the crack resistance of a weld joint structure; la can improve toughness and tensile strength of a weld structure.
The preparation method of the high-strength heat-resistant steel gas shielded welding wire comprises the following steps:
(1) vacuum smelting: putting metal iron, graphite, metal silicon, electrolytic manganese, ferrotitanium, metal molybdenum, metal chromium, metal niobium, metal zirconium, iron cobalt and lanthanum iron into a vacuum induction furnace in sequence according to the proportion for smelting, then vacuumizing to 10-15Pa, then heating to melt, wherein the melting temperature is 1530-1560 ℃, after the raw materials are fully melted, introducing inert gas into a vacuum smelting chamber for refining, wherein the refining temperature is 1580-1620 ℃, and the refining time is 10-20 min;
(2) pouring: after refining, molten steel is tapped and cast from the vacuum induction furnace, the tapping temperature is 1560-1600 ℃, the molten steel flows out of the vacuum induction furnace at a constant speed during casting, a compound deoxidizer accounting for 0.01-0.04% of the weight of the molten steel is added in the process of casting the molten steel for deoxidation operation, and the molten steel is injected into a casting mold along a pouring channel chute to prepare steel ingots;
(3) forging: heating the steel ingot to 1120-1150 ℃ for forging, and forging the steel ingot into a square billet;
(4) rolling: heating the square billet to 1100-1130 ℃, preserving heat for 20-30 minutes, and then rolling into a wire rod with the diameter of 8 mm;
(5) drawing: before drawing, the wire rod is firstly pickled, the wire rod is subjected to intermediate annealing in the drawing process, the intermediate annealing and the drawing are circularly carried out, the intermediate annealing temperature is 600-650 ℃, the heat preservation time is 20-30 minutes, the drawing speed is 2.5-5.0m/s, and the wire rod is continuously drawn for multiple times until the high-strength heat-resistant steel gas shielded welding wire with the diameter of 1.2mm-2.4mm is obtained.
Further preferably, the inert gas in the step 1 comprises argon and helium, the flow ratio of argon to helium is 4-6:3-4, the flow of the inert gas is 0.35-0.40min/L, and the time for introducing the inert gas is 5-10 min.
More preferably, the composite deoxidizer in the step 2 is formed by mixing and pressing aluminum powder, molybdenum trioxide, magnesium oxide, calcium carbonate and lanthanum oxide; the weight ratio of the aluminum powder, the molybdenum trioxide, the magnesium oxide, the calcium carbonate and the lanthanum oxide is 5-6:0.5-1:2-3:1-2: 0.1-0.5.
More preferably, the elongation per drawing in the step 5 is 10% to 20%.
When the high-strength heat-resistant steel gas shielded welding wire is used for welding, 80% Ar +20% CO is used as shielding gas 2 Mixed gas or 95% Ar +5% CO 2 And (4) mixing the gases.
The outstanding substantive features and remarkable progress of the invention are as follows:
1. the high-strength heat-resistant steel gas shielded welding wire provided by the invention has the advantages that the contents of all elements in the alloy are reasonably optimized through scientific research tests on the components in the alloy, and the Si-Mn-Cr-Mo-Nb-Zr main alloy system is determined through research and adjustment of process parameters such as vacuum smelting, pouring, forging, rolling, drawing and the like in the preparation process.
2. The invention adopts a vacuum smelting technology, adjusts the technological parameters of vacuum smelting through a large number of experimental studies, strictly controls the content of S, P and other impurity elements and N, O, H gas elements in the welding wire, ensures the high-purity purification of the welding wire, and reduces the harmful influence of adverse factors on the strength and toughness of the welding seam structure.
3. The composite deoxidizer is added in the molten steel casting process to perform deoxidation operation, so that the oxygen content in the molten steel can be greatly reduced, the degree of oxidation of the molten steel is reduced, and the mass fraction of oxygen in the molten steel can be reduced to 1 x 10 -6 The method can reduce the number of inclusions in molten steel, reduce the sizes of the inclusions and improve the comprehensive performance of the welding wire.
4. The composite deoxidizer is adopted, so that the favorable deoxidation effect is ensured, the bubble combination of decomposition of calcium aluminate, magnesium calcium salt and calcium carbonate is formed in the deoxidation process, molten steel can be quickly discharged, and the problem that deoxidation products are difficult to remove after deoxidation is solved.
5. The addition of trace amounts of Nb, Co and La can not only refine grains, but also improve the high-temperature performance of the weld joint structure of the heat-resistant steel, purify the weld joint structure, denaturalize impurities and microalloying effect, and obviously improve the strength, high-temperature toughness, welding stability and the like of the weld joint structure alloy; co can improve the heat resistance and crack resistance of a weld structure, La is added to improve the toughness and tensile strength of the weld structure, and Nb and C are combined to form an NbC precipitated phase, so that the high-temperature strength of the heat-resistant steel is greatly improved.
Detailed Description
Example 1
The high-strength heat-resistant steel gas shielded welding wire comprises, by mass, 0.05% of C, 0.55% of Si, 1.5% of Mn, 0.02% of Ti, 0.4% of Mo, 0.5% of Cr, 0.5% of Nb, 0.1% of Zr, 0.01% of Co and 0.01% of La; the content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe.
The preparation method of the high-strength heat-resistant steel gas shielded welding wire comprises the following steps:
(1) vacuum smelting: putting metallic iron, graphite, metallic silicon, electrolytic manganese, ferrotitanium, metallic molybdenum, metallic chromium, metallic niobium, metallic zirconium, iron cobalt and lanthanum iron into a vacuum induction furnace in sequence according to the proportion for smelting, then vacuumizing to 10-15Pa, then heating for melting, wherein the melting temperature is 1560 ℃, after the raw materials are fully melted, introducing inert gas into a vacuum melting chamber for refining, the refining temperature is 1620 ℃, and the refining time is 20 min; the inert gas comprises argon and helium, the flow ratio of the argon to the helium is 4:3, the flow of the inert gas is 0.35min/L, and the time for introducing the inert gas is 5 min;
(2) pouring: after refining, molten steel is discharged from the vacuum induction furnace for casting, the steel discharging temperature is 1560 ℃, the molten steel flows out from the vacuum induction furnace at a constant speed during casting, a composite deoxidizer accounting for 0.01 percent of the weight of the molten steel is added in the molten steel casting process for deoxidation operation, and the molten steel is injected into a casting mold along a pouring channel chute to be made into steel ingots; the composite deoxidizer is formed by mixing and pressing aluminum powder, molybdenum trioxide, magnesium oxide, calcium carbonate and lanthanum oxide; aluminum powder, molybdenum trioxide, magnesium oxide, calcium carbonate and lanthanum oxide in a weight ratio of 5:0.5:2:1: 0.1;
(3) forging: heating the steel ingot to 1120 ℃ for forging, and forging the steel ingot into a square billet;
(4) rolling: heating the square billet to 1100 ℃, preserving heat for 20 minutes, and then rolling into a wire rod with the diameter of 8 mm;
(5) drawing: the wire rod is firstly pickled before drawing, the wire rod is subjected to intermediate annealing in the drawing process, the intermediate annealing and the drawing are circularly carried out, the intermediate annealing temperature is 600 ℃, the heat preservation time is 20 minutes, the drawing speed is 2.5-5.0m/s, the wire rod is continuously drawn for multiple times to form the high-strength heat-resistant steel gas-shielded welding wire with the diameter of 1.2mm-2.4mm, and the drawing elongation percentage of each time is 10% -20% during drawing.
Example 2
The high-strength heat-resistant steel gas shielded welding wire comprises, by mass, 0.12% of C, 0.75% of Si, 2.0% of Mn, 0.05% of Ti, 0.8% of Mo, 2.0% of Cr, 1.5% of Nb, 0.4% of Zr, 0.05% of Co and 0.05% of La; the content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe.
The preparation method of the high-strength heat-resistant steel gas shielded welding wire comprises the following steps:
(1) vacuum smelting: putting metallic iron, graphite, metallic silicon, electrolytic manganese, ferrotitanium, metallic molybdenum, metallic chromium, metallic niobium, metallic zirconium, iron cobalt and lanthanum iron into a vacuum induction furnace in sequence according to the proportion for smelting, then vacuumizing to 10-15Pa, then heating for melting, wherein the melting temperature is 1530 ℃, introducing inert gas into a vacuum smelting chamber for refining after the raw materials are fully melted, the refining temperature is 1580 ℃, and the refining time is 10 min; the inert gas comprises argon and helium, the flow ratio of the argon to the helium is 5:3, the flow of the inert gas is 0.36min/L, and the time for introducing the inert gas is 6 min;
(2) pouring: after refining, molten steel is tapped and poured from the vacuum induction furnace, the tapping temperature is 1570 ℃, the molten steel flows out from the vacuum induction furnace at a constant speed during pouring, a composite deoxidizer accounting for 0.02 percent of the weight of the molten steel is added in the molten steel pouring process for deoxidation operation, and the molten steel is poured into a casting mold along a pouring channel chute to be made into steel ingots; the composite deoxidizer is formed by mixing and pressing aluminum powder, molybdenum trioxide, magnesium oxide, calcium carbonate and lanthanum oxide; the weight ratio of the aluminum powder to the molybdenum trioxide to the magnesium oxide to the calcium carbonate to the lanthanum oxide is 6:1:3:2: 0.5;
(3) forging: heating the steel ingot to 1130 ℃ for forging, and forging the steel ingot into a square billet;
(4) rolling: heating the square billet to 1110 ℃, preserving heat for 25 minutes, and then rolling the square billet into a wire rod with the diameter of 8 mm;
(5) drawing: the wire rod is firstly pickled before drawing, the wire rod is subjected to intermediate annealing in the drawing process, the intermediate annealing and the drawing are circularly carried out, the intermediate annealing temperature is 620 ℃, the heat preservation time is 25 minutes, the drawing speed is 2.5-5.0m/s, the wire rod is continuously drawn for multiple times to form the high-strength heat-resistant steel gas shielded welding wire with the diameter of 1.2mm-2.4mm, and the drawing elongation percentage of each time is 10-20% during drawing.
Example 3
The high-strength heat-resistant steel gas shielded welding wire comprises, by mass, 0.06% of C, 0.60% of Si, 1.8% of Mn, 0.03% of Ti, 0.4% of Mo, 0.5% of Cr, 0.5% of Nb, 0.2% of Zr, 0.02% of Co and 0.02% of La; the content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe.
The preparation method of the high-strength heat-resistant steel gas shielded welding wire comprises the following steps:
(1) vacuum smelting: putting metallic iron, graphite, metallic silicon, electrolytic manganese, ferrotitanium, metallic molybdenum, metallic chromium, metallic niobium, metallic zirconium, iron cobalt and lanthanum iron into a vacuum induction furnace in sequence according to the proportion for smelting, then vacuumizing to 10-15Pa, then heating for melting, wherein the melting temperature is 1540 ℃, after the raw materials are fully melted, introducing inert gas into a vacuum smelting chamber for refining, the refining temperature is 1590 ℃, and the refining time is 15 min; the inert gas comprises argon and helium, the flow ratio of the argon to the helium is 6:4, the flow of the inert gas is 0.38min/L, and the time for introducing the inert gas is 8 min;
(2) pouring: after refining, molten steel is discharged from the vacuum induction furnace for pouring, the steel discharging temperature is 1580 ℃, the molten steel flows out from the vacuum induction furnace at a constant speed during pouring, a composite deoxidizer which accounts for 0.01-0.04% of the weight of the molten steel is added in the molten steel pouring process for deoxidation operation, and the molten steel is injected into a casting mold along a pouring channel chute to be made into steel ingots; the composite deoxidizer is formed by mixing and pressing aluminum powder, molybdenum trioxide, magnesium oxide, calcium carbonate and lanthanum oxide; the weight ratio of the aluminum powder to the molybdenum trioxide to the magnesium oxide to the calcium carbonate to the lanthanum oxide is 5:0.8:2.5:1.5: 0.2;
(3) forging: heating the steel ingot to 1140 ℃ for forging, and forging the steel ingot into a square billet;
(4) rolling: heating the square billet to 1120 ℃, preserving heat for 28 minutes, and then rolling into a wire rod with the diameter of 8 mm;
(5) drawing: the wire rod is firstly pickled before drawing, the wire rod is subjected to intermediate annealing in the drawing process, the intermediate annealing and the drawing are circularly carried out, the intermediate annealing temperature is 630 ℃, the heat preservation time is 20-30 minutes, the drawing speed is 2.5-5.0m/s, the wire rod is continuously drawn for multiple times until the high-strength heat-resistant steel gas shielded welding wire with the diameter of 1.2mm-2.4mm is obtained, and the drawing elongation percentage in each drawing is 10% -20%.
Example 4
The gas shielded welding wire for high-strength heat-resistant steel comprises, by mass, 0.08% of C, 0.70% of Si, 2.0% of Mn, 0.04% of Ti, 0.8% of Mo, 2.0% of Cr, 1.5% of Nb, 0.3% of Zr, 0.04% of Co and 0.04% of La; the content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe.
The preparation method of the high-strength heat-resistant steel gas shielded welding wire comprises the following steps:
(1) vacuum smelting: putting metallic iron, graphite, metallic silicon, electrolytic manganese, ferrotitanium, metallic molybdenum, metallic chromium, metallic niobium, metallic zirconium, iron cobalt and lanthanum iron into a vacuum induction furnace in sequence according to the proportion for smelting, then vacuumizing to 10-15Pa, then heating for melting, wherein the melting temperature is 1550 ℃, and after the raw materials are fully melted, introducing inert gas into a vacuum melting chamber for refining, wherein the refining temperature is 1600 ℃ and the refining time is 18 min; the inert gas comprises argon and helium, the flow ratio of the argon to the helium is 5:4, the flow of the inert gas is 0.40min/L, and the time for introducing the inert gas is =10 min;
(2) pouring: after refining, molten steel is tapped and poured from the vacuum induction furnace, the tapping temperature is 1600 ℃, the molten steel flows out of the vacuum induction furnace at a constant speed during pouring, a composite deoxidizer accounting for 0.04 percent of the weight of the molten steel is added in the molten steel pouring process for deoxidation operation, and the molten steel is poured into a casting mold along a pouring channel chute to be made into steel ingots; the composite deoxidizer is prepared by mixing and pressing aluminum powder, molybdenum trioxide, magnesium oxide, calcium carbonate and lanthanum oxide; the weight ratio of the aluminum powder to the molybdenum trioxide to the magnesium oxide to the calcium carbonate to the lanthanum oxide is 6:0.8:2.6:1.8: 0.4;
(3) forging: heating the steel ingot to 1150 ℃ for forging, and forging the steel ingot into a square billet;
(4) rolling: heating the square billet to 1130 ℃, preserving heat for 30 minutes, and then rolling into a wire rod with the diameter of 8 mm;
(5) drawing: before drawing, the wire rod is pickled, intermediate annealing is carried out on the wire rod in the drawing process, the intermediate annealing and the drawing are carried out circularly, the intermediate annealing temperature is 650 ℃, the heat preservation time is 30 minutes, the drawing speed is 2.5-5.0m/s, the wire rod is drawn continuously for multiple times to form the high-strength heat-resistant steel gas-shielded welding wire with the diameter of 1.2mm-2.4mm, and the drawing elongation rate in each drawing is 10% -20%.
Test effects
The welding wire prepared in the embodiment 1-4 is subjected to deposited metal performance test, a 12Cr1MoV pearlite steel plate is selected as a deposited metal welding test plate base metal, the test plate size is 200mm x 100mm x 20mm, the bevel angle is 22.5 ℃, and the welding mode is melting and gas shielded welding.
The welding process parameters are as follows: the welding voltage is 26-30V, the welding current is 260-280A, and the welding speed is as follows: 0.55cm/s, gas flow of 18-20min/L, current polarity of direct current reverse connection (DCEP) m, and protective gas of 95% Ar +5% CO 2 And (4) mixing the gases. Examples according to GB/T228.1-2010 metallic Material tensile testTest part 1: a room temperature test method, GB/T232-2010 metal material bending test method, GB/T2650-2008 welding joint impact test method. The test was carried out with the following results:
table 1 shows the mechanical properties of the welded deposit metal according to the invention:
Figure 6416DEST_PATH_IMAGE001
as shown in Table 1, the weld metal welded by the high-strength heat-resistant steel gas shielded welding wire has excellent strength, plasticity and toughness, can be better applied to industrial production, and can meet the requirements of welding structural members for manufacturing boilers, steam turbines, power machinery, industrial furnaces, aviation, petrochemical engineering and the like.

Claims (3)

1. The high-strength heat-resistant steel gas shielded welding wire is characterized by comprising the following chemical elements in percentage by mass:
0.05 to 0.12 percent of C, 0.55 to 0.75 percent of Si, 1.5 to 2.0 percent of Mn, 0.02 to 0.05 percent of Ti, 0.4 to 0.8 percent of Mo, 0.5 to 2.0 percent of Cr, 0.5 to 1.5 percent of Nb, 0.1 to 0.4 percent of Zr, 0.01 to 0.05 percent of Co and 0.01 to 0.05 percent of La; the single content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe;
the preparation method of the high-strength heat-resistant steel gas shielded welding wire comprises the following steps:
(1) vacuum smelting: putting metal iron, graphite, metal silicon, electrolytic manganese, ferrotitanium, metal molybdenum, metal chromium, metal niobium, metal zirconium, iron cobalt and lanthanum iron into a vacuum induction furnace in sequence according to the proportion for smelting, then vacuumizing to 10-15Pa, then heating to melt, wherein the melting temperature is 1530-1560 ℃, after the raw materials are fully melted, introducing inert gas into a vacuum smelting chamber for refining, wherein the refining temperature is 1580-1620 ℃, and the refining time is 10-20 min;
(2) pouring: after refining, molten steel is tapped and cast from the vacuum induction furnace, the tapping temperature is 1560-1600 ℃, the molten steel flows out of the vacuum induction furnace at a constant speed during casting, a compound deoxidizer accounting for 0.01-0.04% of the weight of the molten steel is added in the process of casting the molten steel for deoxidation operation, and the molten steel is injected into a casting mold along a pouring channel chute to prepare steel ingots;
(3) forging: heating the steel ingot to 1120-1150 ℃ for forging, and forging the steel ingot into a square billet;
(4) rolling: heating the square billet to 1100-1130 ℃, preserving heat for 20-30 minutes, and then rolling into a wire rod with the diameter of 8 mm;
(5) drawing: before drawing, the wire rod is firstly pickled, the wire rod is subjected to intermediate annealing in the drawing process, the intermediate annealing and the drawing are circularly carried out, the intermediate annealing temperature is 600-650 ℃, the heat preservation time is 20-30 minutes, the drawing speed is 2.5-5.0m/s, and the wire rod is continuously drawn for multiple times until the high-strength heat-resistant steel gas shielded welding wire with the diameter of 1.2mm-2.4mm is obtained;
the inert gas in the step 1 comprises argon and helium, the flow ratio of the argon to the helium is 4-6:3-4, the flow of the inert gas is 0.35-0.40min/L, and the time for introducing the inert gas is 5-10 min;
the composite deoxidizer in the step 2 is formed by mixing and pressing aluminum powder, molybdenum trioxide, magnesium oxide, calcium carbonate and lanthanum oxide; the weight ratio of the aluminum powder, the molybdenum trioxide, the magnesium oxide, the calcium carbonate and the lanthanum oxide is 5-6:0.5-1:2-3:1-2: 0.1-0.5.
2. The high strength, heat resistant steel gas shield welding wire of claim 1, wherein: the chemical elements comprise, by mass, 0.06-0.08% of C, 0.60-0.70% of Si, 1.8-2.0% of Mn, 0.03-0.04% of Ti, 0.4-0.8% of Mo, 0.5-2.0% of Cr, 0.5-1.5% of Nb, 0.2-0.3% of Zr, 0.02-0.04% of Co and 0.02-0.04% of La; the content of other impurity elements is less than or equal to 0.05 percent, the total content of other impurity elements is less than or equal to 0.15 percent, and the balance is Fe.
3. The high strength, heat resistant steel gas-shielded welding wire of claim 1, wherein: the elongation per drawing in the step 5 is 10-20%.
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