CN115609187A

CN115609187A - Argon arc welding wire for 5Cr-0.5Mo high-temperature-resistant steel and preparation method and use method thereof

Info

Publication number: CN115609187A
Application number: CN202211377073.3A
Authority: CN
Inventors: 冯伟; 徐锴; 魏涛; 张庆素; 邹力维; 胡晓波; 宋昌洪; 韩宇; 于庭祥; 胡鹏亮; 刘满雨; 李品学; 李丹晖; 张昕; 孙元奇
Original assignee: Harbin Well Welding Co ltd
Current assignee: Harbin Well Welding Co ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-01-17

Abstract

The invention discloses an argon arc welding wire for 5Cr-0.5Mo high-temperature-resistant steel, a preparation method and a use method thereof, and belongs to the technical field of welding materials and preparation thereof. The welding wire comprises the following chemical components in percentage by weight: c:0.06 to 0.09%, si:0.20 to 0.50%, mn: 0.40-0.70%, cr:5.00 to 6.00 percent, mo:0.45 to 0.65%, cu:0.10 to 0.20%, ni:0.10 to 0.40%, ti:0.01 to 0.05%, V:0.01 to 0.03 percent, less than or equal to 0.005 percent of O, less than or equal to 0.010 percent of N, and the balance of Fe and inevitable impurities. The welding wire is suitable for argon arc welding, the welding joint of the welding wire has the same structure and very similar chemical components with the base metal, and the mechanical property similar to the base metal can be obtained.

Description

Argon arc welding wire for 5Cr-0.5Mo high-temperature-resistant steel and preparation method and use method thereof

Technical Field

The invention relates to an argon arc welding wire for 5Cr-0.5Mo high-temperature-resistant steel, a preparation method and a use method thereof, and belongs to the technical field of welding materials and preparation thereof.

Background

5% Cr-0.5% Mo (5 Cr-0.5 Mo) steel is a chromium molybdenum heat resistant steel which has high oxidation resistance and heat strength and an operating temperature as high as 600 ℃ and is widely used in steam turbines, thermal power plants, nuclear power plants, petroleum refining and other high temperature equipment, particularly large oil refining chemical plants. Most of crude oil is high-sulfur crude oil, which is remarkably corroded in pipeline equipment, and existing carbon steel and low alloy steel have failed to satisfy the requirement for corrosion resistance of process equipment and pipelines for processing high-sulfur crude oil, whereas 5% Cr-0.5% Mo steel is often used in large-scale refinery units and transportation pipelines, particularly in refinery units such as atmospheric and vacuum distillation, coking, catalysis, etc., because of its high-temperature oxidation resistance, high-temperature sulfur corrosion resistance, hydrogen resistance and certain naphthenic acid corrosion resistance.

But the content of Cr in Mo steel is high by 5-0.5 percent, so that the hardenability of the material is high, the welding performance is poor, the problems of cracking of a base material and a welding line or standard exceeding of hardness and the like easily occur in the equipment manufacturing and construction processes, and great potential safety hazards are caused to the driving operation of the device. And 5-0.5% of Cr-Mo steel after welding, the heat-affected zone is liable to form a hardened structure, and is liable to form cold cracks by the combined action of hydrogen, residual stress and the like. Thus, studies on the welding properties of 5-Cr-0.5-Mo steel are one of the hot spots of interest today.

The prior art adopts a novel low-chromium high-manganese austenite welding material to carry out 5-Cr-0.5-Mo steel welding, obtains more satisfactory results, but the weld metal and the parent metal have different chemical compositions and different physical and mechanical properties in the heterogeneous welding process, and carbon migration and carbide tissue structure change can occur on a welding interface after long-term service at high temperature. The carbon migration causes poor carbon bands and carburising bands to appear on two sides of the fusion line, the strength of the poor carbon bands is reduced, the hardness of the carburising bands is increased, the toughness is reduced or low-temperature brittleness appears. Therefore, it is necessary to provide a welding wire for high temperature steel, which is suitable for 5-0.5% of Cr, and has characteristics of crack resistance, corrosion resistance and high temperature resistance.

Disclosure of Invention

The present invention has been made to solve the above problems occurring in the prior art, and an object of the present invention is to provide a welding wire for argon arc welding of 5% Cr-0.5% Mo steel, which has crack resistance, corrosion resistance, and high temperature resistance, and is suitable for use in steam turbines, thermal power stations, nuclear power plants, petroleum refining, and other high temperature equipment.

The technical scheme of the invention is as follows:

one of the purposes of the invention is to provide an argon arc welding wire for 5Cr-0.5Mo high-temperature resistant steel, which comprises the following chemical components in percentage by weight: c:0.06 to 0.09%, si:0.20 to 0.50%, mn: 0.40-0.70%, S is less than or equal to 0.005%, P is less than or equal to 0.006%, cr:5.00 to 6.00 percent, mo:0.45 to 0.65%, cu:0.10 to 0.20%, ni:0.10 to 0.40%, ti:0.01 to 0.05%, V:0.01 to 0.03 percent of As, less than or equal to 0.005 percent of Sn, less than or equal to 0.003 percent of Pb, less than or equal to 0.005 percent of O, less than or equal to 0.010 percent of N, and the balance of Fe and inevitable impurities.

In the invention, the reasons for setting the chemical component ranges of the argon arc welding wire for the 5Cr-0.5Mo high-temperature resistant steel are as follows:

c:0.06 to 0.09 percent; the increase of the carbon content increases the strength and hardness of the carbon steel, and decreases the plasticity, toughness and weldability. As a high alloy steel for heat resistance at high temperatures, the carbon content should be 0.04% or more, but the corrosion resistance is lowered. Therefore, the carbon content is strictly controlled, so that the C content is 0.06-0.09% in the invention.

Ni:0.10 to 0.40 percent; ni is a commonly used element for obtaining excellent low-temperature toughness. The steel has the advantages of strengthening ferrite, refining and increasing pearlite, improving the strength of the steel, having small influence on the plasticity of the steel, improving the hardenability, promoting the formation of acicular ferrite, improving the strength and toughness of a welding seam, particularly the low-medium temperature impact toughness, reducing the ductile-brittle transition temperature, and properly reducing the carbon content of nickel-containing steel, so that the toughness and the plasticity are improved, and the nickel does not increase the resistance of the steel to creep deformation and is not generally used as a strengthening element in hot-strength steel. Nickel is an element with certain corrosion resistance, and has certain corrosion resistance to acid, alkali, salt and atmosphere. Therefore, the Ni content in the invention is 0.10-0.40%.

V:0.01 to 0.03 percent; vanadium has strong affinity with carbon, ammonia and oxygen, and forms corresponding stable compounds with the vanadium. Vanadium is mainly present in steel in the form of carbides. The main function of the steel is to refine the structure and crystal grains of the steel and improve the strength and toughness of the steel. When dissolved in solid solution at high temperature, hardenability is increased; the vanadium can refine grains in common low-carbon alloy steel, improve the strength, yield ratio and low-temperature characteristics after normalizing, and improve the welding performance of the steel. Therefore, the V content in the invention is 0.01-0.03%.

Cu:0.10 to 0.20 percent; the prominent effect of Cu in steel is to improve the corrosion resistance of common low alloy steel, the strength of steel can be improved by adding copper, and the Cu has the effect of refining grains and obviously improves the low-temperature impact toughness. When the copper content exceeds 0.75%, the aging strengthening effect can be generated after the solution treatment and the aging. At low levels, the effect is similar to that of nickel, but is weaker. At higher levels, copper embrittlement can result in brittle failure. Therefore, the Cu content in the invention is 0.10-0.20%, which can not only ensure the low-temperature impact property, but also improve the corrosion resistance.

Ti:0.01 to 0.05 percent; ti is the strongest carbide forming element, has extremely strong affinity with nitrogen and oxygen, and is a good degasifier and an effective element for fixing nitrogen and carbon. Because titanium can fix carbon, the titanium alloy has the function of preventing and relieving material stress corrosion. Titanium can improve the oxidation resistance and the heat strength of the heat-resistant steel. Titanium is used as a strong carbide forming element, and can improve the stability of the steel in high temperature, high pressure and hydrogen. Therefore, the Ti content in the invention is 0.01-0.05%.

S, P, O, N: sulfur and oxygen as impurity elements are often present in carbon steels in the form of non-metallic compounds (e.g., feS, feO) forming non-metallic impurities, leading to deterioration of material properties, especially the presence of sulfur causing hot embrittlement of the material. Sulfur and phosphorus are elements to be controlled in steel, and the quality of carbon steel is evaluated according to the content of the elements. Therefore, the content of O is less than or equal to 0.005 percent, the content of N is less than or equal to 0.010 percent, the content of S is less than or equal to 0.005 percent, and the content of P is less than or equal to 0.006 percent.

As, sn, pb: as impurity elements, they have a certain effect on improving the tensile strength of carbon steel, but at the same time increase the brittleness, especially low temperature brittleness, of the steel. Harmful elements causing serious segregation of carbon steel. Which is detrimental to the weldability of the steel and which increases the susceptibility to weld cracking. Due to the high melting point of the low alloy steel, impurity elements are easy to migrate and aggregate at high temperature, so that the high temperature tempering brittleness of the low alloy steel is caused. Therefore, the content of As in the invention is less than or equal to 0.005 percent; the Sn content is less than or equal to 0.005, and the Pb content is less than or equal to 0.003.

Further defined, the welding wire comprises the following chemical components in percentage by weight: c:0.06 to 0.09%, si:0.20 to 0.40%, mn: 0.40-0.70%, S is less than or equal to 0.005%, P is less than or equal to 0.006%, cr:5.00 to 6.00 percent, mo:0.45 to 0.65%, cu:0.10 to 0.20%, ni:0.10 to 0.40%, ti:0.01 to 0.05%, V:0.01 to 0.03 percent of As, less than or equal to 0.005 percent of Sn, less than or equal to 0.003 percent of Pb, less than or equal to 0.005 percent of O, less than or equal to 0.010 percent of N, and the balance of Fe and inevitable impurities.

Further defined, the welding wire comprises the following chemical components in percentage by weight: c:0.09%, si:0.30%, mn:0.65%, S:0.0018%, P:0.0049%, cr:5.15%, mo:0.51%, cu:0.19%, ni:0.25%, ti:0.020%, V:0.02%, O:0.0046%, N:0.0092%, and the balance of Fe and inevitable impurities.

Further defined, the welding wire comprises the following chemical components in percentage by weight: c:0.08%, si:0.25%, mn:0.65%, S:0.0022%, P:0.0060%, cr:5.02%, mo:0.51%, cu:0.15%, ni:0.20%, ti:0.024%, V:0.01%, O:0.0049%, N:0.0091%, and the balance of Fe and inevitable impurities.

Further defined, the welding wire comprises the following chemical components in percentage by weight: c:0.09%, si:0.28%, mn:0.60%, S:0.0041%, P:0.0044%, cr:5.01%, mo:0.51%, cu:0.15%, ni:0.19%, ti:0.029%, V:0.02%, O:0.0049%, N:0.0094%, and the balance of Fe and inevitable impurities.

Further defined, the welding wire comprises the following chemical components in percentage by weight: c:0.08%, si:0.33%, mn:0.61%, S:0.0022%, P:0.0048%, cr:5.24%, mo:0.49%, cu:0.18%, ni:0.25%, ti:0.022%, V:0.01%, O:0.0046%, N:0.0091%, and the balance of Fe and inevitable impurities.

Further defined, the welding wire comprises the following chemical components in percentage by weight: c:0.08%, si:0.25%, mn:0.59%, S:0.0031%, P:0.0052%, cr:5.12%, mo:0.53%, cu:0.17%, ni:0.23%, ti:0.022%, V:0.02%, O:0.0047%, N:0.0093%, and the balance of Fe and inevitable impurities.

Further limiting, after heat treatment is carried out for 1-8 hours at 745 ℃, the room-temperature tensile strength of the welding wire deposited metal is more than or equal to 550MPa, the room-temperature yield strength is more than or equal to 470MPa, the elongation after fracture is more than or equal to 17%, the yield strength at 600 ℃ is more than or equal to 179MPa, the impact energy Akv at-30 ℃ is more than 100J, and the impact energy Akv at room temperature is more than 200J.

The invention also aims to provide a preparation method of the argon arc welding wire for the 5Cr-0.5Mo high-temperature-resistant steel, which comprises the steps of weighing the components in proportion, smelting by using a 0.5t electric furnace, forging and rolling, drawing and plating copper in sequence, processing into a welding wire with the diameter phi of 2.4mm, straightening and shredding, and enabling the specification to be phi 2.4 x 1000mm.

The invention also aims to provide a use method of the argon arc welding wire for the 5Cr-0.5Mo high-temperature-resistant steel, and specifically, under the protection of argon, the welding parameters are as follows: the welding voltage is 13-15V, the welding current is 180A, the welding speed is 50-100 mm/min, the inter-road temperature is 200-250 ℃, and the flow of the protective gas is 13-18L/min.

The welding wire has the advantages that the welding wire has the component design and the action mechanism that the welding wire influences the welding seam structure and performance by adding the strengthening alloy elements, and solves the problems of crack resistance, corrosion resistance and high temperature resistance of the material by designing the component control of the contents of C, si, S, P, cr, mo, ni, ti, O and N. The invention achieves the effect of obviously improving the low-temperature impact toughness by increasing V, ti and Ni elements, improves the crack resistance of the welding material by controlling the contents of C, si, mn, O, N and other elements, and reduces the tendency of welding cold cracking. The corrosion resistance and high temperature resistance of the material are improved by controlling the proportion of elements such as Cr, ni, mo, V, ti and the like, and tests show that the technical progress is obvious. Compared with the prior art, the application also has the following beneficial effects:

(1) In terms of the control of cold cracking, 5-0.5% of the Mo steel shows that both of the main alloying elements chromium and molybdenum significantly improve the hardenability of the steel, and it is clear from the structural state diagram of chromium steel that the chromium content is 5-10%, the carbon content is 0.1% or more, and the structure in the isothermal heat treatment state is hardened martensite. After welding, the steel is easy to form a quenched structure in a heat affected zone, and is easy to form cold cracks under the combined action of factors such as hydrogen, residual stress and the like, so that the content of elements such as C, si, mn, O, N and the like in the welding wire is controlled to improve the crack resistance of the welding material. In addition, TIG welding has good advantages compared with other welding methods, and the problem of welding cold cracks is well solved by controlling the welding process, preheating before welding and carrying out heat treatment after welding. The welding wire provided by the invention is suitable for argon arc welding, the welding joint of the welding wire has the same structure and very similar chemical components with the base metal, and the mechanical property similar to the base metal can be obtained. No obvious problems of diffusion of alloy elements and carbon migration in use.

(2) The corrosion resistance and the high temperature resistance are shown, and the corrosion is a key factor influencing the reliability and the service life of a petrochemical device. At present, high temperature oxidation, hydrogen corrosion, sulfur corrosion, hydrogen sulfide corrosion and organic acid corrosion are the main damage causes of petrochemical pipelines and refining and chemical devices. The 5-percent Cr-0.5-percent Mo steel argon arc welding wire provided by the invention has higher Cr and Mo contents, and Cr is preferentially oxidized than Fe in the oxidation process and can form a compact oxidation film on the surface and prevent oxygen from diffusing into the interior. At high temperatures, cr and Mo form Cr-Mo alloys, which have high-temperature oxidation resistance. Meanwhile, cr and Mo elements can also effectively prevent H and C from reacting to generate CH ₄ Causing embrittlement. The hydrogen sulfide corrosion of low alloy steel is controlled by two major factors, anodic dissolution and the formation of corrosion products on the steel surface, while the corrosion of carbon steel in hydrogen sulfide containing salt solutions is divided into two phases: electron transfer processes between corrosion products and the iron matrix and electron transfer processes in the iron corrosion product film. And failure behavior is closely related to chemical composition, microstructure, density and hydrogen traps. It is generally accepted that Cr-Mo steel of tempered martensite structure has good resistance to hydrogen sulfide stress corrosion cracking. Therefore, a good corrosion film can be formed through the optimized design of the components so as to improve the sulfur resistance. However, the prior art considers that the electrochemical behavior of steel can be changed by adding copper, the dissolution behavior of a steel matrix and carbide in a hydrogen sulfide medium is an important factor influencing the corrosion resistance of hydrogen sulfide, and proposes a corrosion mechanism of the material in the hydrogen sulfide medium. But the invention achieves the purpose of obviously improving the corrosion resistance by increasing Cu and Ti elements, and the technical progress is obvious.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The experimental procedures used in the following examples are conventional unless otherwise specified. The materials, reagents, methods and apparatus used, unless otherwise specified, are conventional in the art and are commercially available to those skilled in the art.

The components of the welding wire in all the embodiments of the invention are listed in table 1, and the deposited metal mechanical properties of the welding wire are listed in table 2.

Example 1:

the composition of the welding wire of the present example is shown in the data corresponding to example 1 in table 1;

the welding wire comprises the following chemical components in percentage by weight: c:0.09%, si:0.30%, mn:0.65%, S:0.0018%, P:0.0049%, cr:5.15%, mo:0.51%, cu:0.19%, ni:0.25%, ti:0.020%, V:0.02%, O:0.0046%, N:0.0092%, the balance being Fe and unavoidable impurities.

The preparation method of the welding wire comprises the following steps: the components are weighed according to the proportion, the welding wire is smelted by using a 0.5t electric furnace, and is processed into the welding wire with the diameter phi of 2.4mm after forging rolling and drawing copper plating, and then straightening and shredding are carried out, wherein the specification is phi 2.4 multiplied by 1000mm.

The obtained welding wire is subjected to heat treatment for 1h at 745 ℃, and the deposited metal mechanical property test of the welding wire is carried out, and the result is shown in table 2.

After heat treatment at 745 ℃ for 1h, the welding wire satisfies 5-Cr-0.5%.

The method of welding 5-cr-0.5-mo high temperature resistant steel with the above welding wire is, welding under argon protection, wherein the welding parameters are: the welding voltage is 13-15V, the welding current is 180A, the welding speed is 50-100 mm/min, the inter-road temperature is 200-250 ℃, and the flow of the protective gas is 13-18L/min.

Example 2:

the composition of the welding wire of the present example is shown in the data corresponding to example 2 in table 1;

the welding wire comprises the following chemical components in percentage by weight: c:0.08%, si:0.25%, mn:0.65%, S:0.0022%, P:0.0060%, cr:5.02%, mo:0.51%, cu:0.15%, ni:0.20%, ti:0.024%, V:0.01%, O:0.0049%, N:0.0091%, and the balance of Fe and inevitable impurities.

The preparation method of the welding wire comprises the following steps: the components are weighed according to the proportion, the welding wire is smelted by a 0.5t electric furnace, and is processed into the welding wire with the diameter phi of 2.4mm after forging rolling and drawing copper plating, and then straightening and shredding are carried out, wherein the specification is phi 2.4 multiplied by 1000mm.

The method for welding the high-temperature-resistant steel with the content of 5-0.5% of Cr-0.5% of Mo by adopting the welding wire comprises the following steps of welding under the protection of argon, wherein the welding parameters are as follows: the welding voltage is 13-15V, the welding current is 180A, the welding speed is 50-100 mm/min, the inter-road temperature is 200-250 ℃, and the flow of the protective gas is 13-18L/min.

Example 3:

the composition of the welding wire of the present example is shown in the data corresponding to example 3 in table 1;

the welding wire comprises the following chemical components in percentage by weight: c:0.09%, si:0.28%, mn:0.60%, S:0.0041%, P:0.0044%, cr:5.01%, mo:0.51%, cu:0.15%, ni:0.19%, ti:0.029%, V:0.02%, O:0.0049%, N:0.0094%, and the balance of Fe and inevitable impurities.

Example 4:

the composition of the wire of the present example is shown in the data corresponding to example 4 in table 1;

the welding wire comprises the following chemical components in percentage by weight: c:0.08%, si:0.33%, mn:0.61%, S:0.0022%, P:0.0048%, cr:5.24%, mo:0.49%, cu:0.18%, ni:0.25%, ti:0.022%, V:0.01%, O:0.0046%, N:0.0091%, and the balance of Fe and unavoidable impurities.

Example 5:

the composition of the welding wire of the present example is shown in the data corresponding to example 5 in table 1;

the welding wire comprises the following chemical components in percentage by weight: c:0.08%, si:0.25%, mn:0.59%, S:0.0031%, P:0.0052%, cr:5.12%, mo:0.53%, cu:0.17%, ni:0.23%, ti:0.022%, V:0.02%, O:0.0047%, N:0.0093%, and the balance of Fe and inevitable impurities.

Comparative example 1:

the composition of the welding wire of the present comparative example is shown in the data corresponding to comparative example 1 in table 1;

the welding wire comprises the following chemical components in percentage by weight: c:0.09%, si:0.34%, mn:0.63%, S:0.0023%, P:0.0050%, cr:5.22%, mo:0.42%, cu:0.16%, ni:0.30%, ti:0.035%, V:0.02%, O:0.0046%, N:0.0091%, and the balance of Fe and unavoidable impurities.

Comparative example 2:

the composition of the wire of this comparative example is shown in the data corresponding to comparative example 2 in table 1;

the welding wire comprises the following chemical components in percentage by weight: c:0.09%, si:0.32%, mn:0.60%, S:0.0024%, P:0.0047%, cr:5.17%, mo:0.43%, cu:0.19%, ni:0.32%, ti:0.035%, V:0.05%, O:0.0036%, N:0.0093%, and the balance of Fe and unavoidable impurities.

The method for welding the high-temperature-resistant steel with the content of 5-0.5% of Cr-0.5% of Mo by adopting the welding wire comprises the following steps of welding under the protection of argon, wherein the welding parameters are as follows: the welding voltage is 13-15V, the welding current is 180A, the welding speed is 50-100 mm/min, the inter-track temperature is 200-250 ℃, and the flow of the protective gas is 13-18L/min.

Comparative example 3:

the composition of the wire of this comparative example is shown in the data corresponding to comparative example 3 in table 1;

the welding wire comprises the following chemical components in percentage by weight: c:0.08%, si:0.28%, mn:0.58%, S:0.0033%, P:0.0044%, cr:5.26%, mo:0.41%, cu:0.19%, ni:0.30%, ti:0.034%, V:0.001%, O:0.0046%, N:0.0095%, and the balance of Fe and inevitable impurities.

TABLE 1 welding wire chemical composition (Wt.%)

TABLE 2 mechanical properties of deposited metal of welding wire (PWHT: 745 ℃ C.. Times.1 h)

The welding wires obtained in examples 1 to 5 were subjected to heat treatment for various periods of time, and mechanical properties of deposited metal were carried out, and the results are shown in table 3.

TABLE 3

As can be seen from table 2 above, and by comparing the examples with the comparative examples, examples 1 to 5 all satisfied the design requirements, and when the Ti, V, and Cu components were adjusted in comparative examples 1 to 3, respectively, the Ti out-of-range in comparative example 1, the V out-of-range in comparative example 2, and the Cu out-of-range in comparative example 3, the elongation after break and the impact absorption energy were all decreased.

As can be seen from the above table 3, after the welding wire obtained in example 1 is subjected to heat treatment for different periods of time and is subjected to heat treatment at 745 ℃ for 1-8 h, the deposited metal of the welding wire can meet the design requirements that the room-temperature tensile strength is not less than 550MPa, the room-temperature yield strength is not less than 470MPa, the elongation after fracture is not less than 17%, the yield strength at 600 ℃ is not less than 179MPa, the impact energy Akv at 30 ℃ is more than 100J, and the impact energy Akv at room temperature is more than 200J.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The argon arc welding wire for 5Cr-0.5Mo high-temperature resistant steel is characterized by comprising the following chemical components in percentage by weight: c:0.06 to 0.09%, si:0.20 to 0.50%, mn: 0.40-0.70%, S is less than or equal to 0.005%, P is less than or equal to 0.006%, cr:5.00 to 6.00 percent, mo:0.45 to 0.65%, cu:0.10 to 0.20%, ni:0.10 to 0.40%, ti:0.01 to 0.05%, V:0.01 to 0.03 percent of As, less than or equal to 0.005 percent of Sn, less than or equal to 0.003 percent of Pb, less than or equal to 0.005 percent of O, less than or equal to 0.010 percent of N, and the balance of Fe and inevitable impurities.

2. The argon arc welding wire for 5Cr-0.5Mo high-temperature resistant steel according to claim 1, wherein the chemical components comprise, by weight: c:0.06 to 0.09%, si:0.20 to 0.40%, mn: 0.40-0.70%, S is less than or equal to 0.005%, P is less than or equal to 0.006%, cr:5.00 to 6.00 percent, mo:0.45 to 0.65%, cu:0.10 to 0.20%, ni:0.10 to 0.40%, ti:0.01 to 0.05%, V:0.01 to 0.03 percent of As, less than or equal to 0.005 percent of Sn, less than or equal to 0.003 percent of Pb, less than or equal to 0.005 percent of O, less than or equal to 0.010 percent of N, and the balance of Fe and inevitable impurities.

3. The argon arc welding wire for 5Cr-0.5Mo high-temperature resistant steel according to claim 1, wherein the chemical components comprise, by weight: c:0.09%, si:0.30%, mn:0.65%, S:0.0018%, P:0.0049%, cr:5.15%, mo:0.51%, cu:0.19%, ni:0.25%, ti:0.020%, V:0.02%, O:0.0046%, N:0.0092%, and the balance of Fe and inevitable impurities.

4. The argon arc welding wire for 5Cr-0.5Mo high-temperature resistant steel according to claim 1, wherein the chemical components comprise, by weight: c:0.08%, si:0.25%, mn:0.65%, S:0.0022%, P:0.0060%, cr:5.02%, mo:0.51%, cu:0.15%, ni:0.20%, ti:0.024%, V:0.01%, O:0.0049%, N:0.0091%, and the balance of Fe and unavoidable impurities.

5. The argon arc welding wire for 5Cr-0.5Mo high-temperature resistant steel according to claim 1, wherein the chemical components comprise, by weight: c:0.09%, si:0.28%, mn:0.60%, S:0.0041%, P:0.0044%, cr:5.01%, mo:0.51%, cu:0.15%, ni:0.19%, ti:0.029%, V:0.02%, O:0.0049%, N:0.0094%, and the balance of Fe and inevitable impurities.

6. The argon arc welding wire for 5Cr-0.5Mo high-temperature resistant steel according to claim 1, wherein the chemical components comprise, by weight: c:0.08%, si:0.33%, mn:0.61%, S:0.0022%, P:0.0048%, cr:5.24%, mo:0.49%, cu:0.18%, ni:0.25%, ti:0.022%, V:0.01%, O:0.0046%, N:0.0091%, and the balance of Fe and inevitable impurities.

7. The argon arc welding wire for the 5Cr-0.5Mo high-temperature-resistant steel according to claim 1, wherein the chemical components comprise, by weight: c:0.08%, si:0.25%, mn:0.59%, S:0.0031%, P:0.0052%, cr:5.12%, mo:0.53%, cu:0.17%, ni:0.23%, ti:0.022%, V:0.02%, O:0.0047%, N:0.0093%, and the balance of Fe and unavoidable impurities.

8. The argon arc welding wire for 5Cr-0.5Mo high-temperature resistant steel as claimed in claim 1, wherein after heat treatment at 745 ℃ for 1-8 h, the deposited metal of the welding wire has room temperature tensile strength of 550MPa or more, room temperature yield strength of 470MPa or more, elongation after fracture of 17% or more, yield strength of 179MPa or more at 600 ℃, impact Akv at-30 ℃ of 100J or more, and impact Akv at room temperature of 200J or more.

9. The preparation method of the argon arc welding wire for the 5Cr-0.5Mo high-temperature resistant steel as claimed in claim 1, which is characterized in that the components are weighed in proportion, the welding wire is smelted by a 0.5t electric furnace, and is processed into the welding wire with the diameter of phi 2.4mm after forging rolling and drawing copper plating, and then straightening and shredding are carried out, wherein the specification is phi 2.4 x 1000mm.

10. The use method of the argon arc welding wire for the 5Cr-0.5Mo high-temperature resistant steel as claimed in claim 1 is characterized in that under the protection of argon, the welding parameters are as follows: the welding voltage is 13-15V, the welding current is 180A, the welding speed is 50-100 mm/min, the inter-road temperature is 200-250 ℃, and the flow of the protective gas is 13-18L/min.