Cr13 series stainless steel gas shielded flux-cored wire for surfacing and surfacing method

Abstract

The application provides a Cr13 series stainless steel surfacing gas shielded flux-cored wire and a surfacing method, a Cr13 petroleum drill rod joint wear-resistant gas shielded flux-cored wire is newly developed by optimizing the alloy component of the flux-cored wire and the mineral component, and the single-layer hardness is greater than 57HRC; the contradiction problem of insufficient wear resistance and toughness of the traditional wear-resistant welding wire is solved, meanwhile, 7-15% of austenite is formed in the organization, which is beneficial to reducing the wear resistance coefficient of the material, that is, improving the wear resistance of the material, and the process is researched.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of surfacing, in particular to a Cr13 stainless steel surfacing gas shielded flux-cored wire and a surfacing method. BACKGROUND

[0002] Petroleum enterprises use surfacing drill joint wear-resistant band processing technology to upgrade the quality of the use of drill pipe, effectively improve the working efficiency and service life of the oil drill pipe workpiece, and the drill pipe joint wear-resistant band is essentially a isolation band with a certain width and thickness along the circumference of the joint. Through the isolation band, the outer wall of the drill pipe joint and the casing wall or the well wall are isolated to avoid direct contact between the drill pipe joint and the casing wall or the well wall to protect the drill pipe joint and the casing from severe wear. At present, as the gas shielded surfacing petroleum drill pipe annular wear-resistant band has low toughness (the V-shaped notch impact toughness is greater than 10 J / cm 2 which is beneficial to inhibit the peeling and crack of the wear-resistant band, and the defects such as insufficient wear resistance are the main reasons limiting the application of the wear-resistant band. SUMMARY

[0003] Therefore, the present application aims to provide a Cr13 stainless steel surfacing gas shielded flux-cored wire and a surfacing method. By optimizing the alloy components of the flux-cored wire and the mineral components, a Cr13 petroleum drill pipe joint wear-resistant band gas shielded flux-cored wire is newly developed, and the single-layer hardness is greater than 57HRC. The contradiction between the wear resistance and toughness of the traditional wear-resistant wire is solved, and 7-15% of austenite is formed in the organization to reduce the wear resistance coefficient of the material, that is, to improve the wear resistance of the material, and the process is researched.

[0004] To achieve the above purpose, the technical scheme of the present application is as follows:

[0005] A Cr13 stainless steel surfacing gas shielded flux-cored wire, the wire includes the following components by weight percentage: cryolite: 0.2%-1.5%; zirconium silicon powder: 0.1-0.45%; potassium titanate: 0.1%-1%; titanium iron: 1.0%-6%; high-carbon chromium iron: 20%-35%; titanium carbide: 1.8-11%; graphite: 0.8-7.0%; micro-carbon chromium iron: 40-52%; niobium iron: 1-8%; vanadium iron: 1.0-4.0%; silicon iron: 1.0%-5.5%; manganese powder: 0.5%-2.5%; boron iron: 0-1.4%; and the balance is iron powder.

[0006] A certain amount of high-melting-point zirconium silicon powder is added, which mainly functions to control the melting point of the wire, increase the flowability of the weld, and promote the smoothness of the weld, that is, the weld is round and smooth. Potassium titanate and cryolite mainly function to stabilize the arc.

[0007] Further, the mass ratio of high-carbon chromium iron, titanium carbide and graphite is 1:0.1-0.4:0.05-0.2.

[0008] Further, the mass ratio of titanium carbide and ferrotitanium is 0.8-1.5, so as to ensure welding forming and hardness.

[0009] Further, the mass ratio of titanium carbide and ferrotitanium to ferro-niobium and ferro-vanadium is greater than 0.85.

[0010] Nb, Ti and V are crucial to the formation of carbide quantity in the metallographic structure of high-carbon Cr13 series. The present application optimizes the content of Nb, Ti and V, and particularly considers cost performance and process performance. For example, the price of ferrotitanium is only 1 / 7-9 of that of ferro-niobium, and 1 / 4-6 of that of ferro-vanadium. Therefore, titanium alloy is used for strengthening in the case of ensuring process performance, and the requirement is that the mass ratio of (titanium carbide + ferrotitanium) to (ferro-niobium + ferro-vanadium) is greater than 0.85. In this way, the structure can have a certain number of small hard phases represented by TIC and NbC and be in a dispersed distribution, so as to improve the hardness and wear resistance of the wear-resistant belt.

[0011] Further, the mass percentage of Ti in the ferrotitanium is greater than 25%.

[0012] Further, the mass percentage of Cr in the high-carbon chromium iron is greater than 64%, and the mass percentage of C is greater than 8%;

[0013] The mass percentage of Cr in the micro-carbon chromium iron is greater than 68%, and the mass percentage of C is less than 0.035%;

[0014] The mass percentage of Si in the ferrosilicon is greater than 74%;

[0015] The mass percentage of V in the ferro-vanadium is 50%-70%;

[0016] The mass percentage of Nb in the ferro-niobium is 60%-70%;

[0017] The mass percentage of B in the ferro-boron is greater than 20%;

[0018] The mass percentage of Zr in the zirconium-silicon powder is 1-2%;

[0019] The purity of the manganese powder, graphite and titanium carbide respectively reaches more than 99%.

[0020] Further, the deposited metal of the welding wire comprises the following components in terms of weight percentage:

[0021] C: 0.80%-1.40%;

[0022] Cr: 11.5%-13.5%;

[0023] Nb: 0.1%-2.0%;

[0024] V: 0.1-1.0%;

[0025] Mn: 0.1%-1%;

[0026] Si: 0.2%-1.1%;

[0027] Ti: 0.6-2.0%

[0028] B: 0-0.1%,

[0029] Zr: 0-0.04%;

[0030] balance Fe.

[0031] Wherein, the main role of C is to form a large number of fine dispersed carbide with Nb, Ti, V, etc., and the carbide is the key to improve hardness and wear resistance, but also an important reason for restricting crack generation.

[0032] The chromium content has a great influence on the metallographic structure of high-carbon Cr13 series, and is the main factor to balance martensite and austenite. The increase of chromium content is beneficial to the formation of austenite and increases the toughness, but damages the hardness and wear resistance, therefore, the selection of chromium content must be controlled within a certain range.

[0033] Further, the diameter of the welding wire is 1.6 mm, and the hardness of the deposited metal of the welding wire in the as-welded state is ≥57HRc.

[0034] The application also provides a surfacing method of the Cr13 series stainless steel gas shield flux-cored wire for surfacing as described above, which comprises the following steps:

[0035] (1) using the welding wire for gas protection surfacing;

[0036] (2) the welded part is subjected to slow cooling treatment after welding;

[0037] (3) the welded part is cooled to room temperature.

[0038] Further, the welding part is preheated before step (1), and the preheating temperature is not less than 120 DEG C.

[0039] Further, in step (1), the gas in the gas protection is one or both of carbon dioxide and argon, and the gas flow is 20-28 ml / min; the surfacing welding current is 280-400 A, and the welding voltage is 32-38 V.

[0040] In step (2), the slow cooling speed is 55 DEG C / h-75 DEG C / h.

[0041] Compared with the prior art, the Cr13 series stainless steel gas shielded flux-cored wire for surfacing and the surfacing method have the following advantages:

[0042] (1) The Cr13 series stainless steel gas shielded flux-cored wire for surfacing has a structure of martensite + austenite + carbide, that is, mainly martensite, 7-15% of austenite, and a certain amount of carbide distributed on the matrix, which not only has good process performance, but also has high hardness, high toughness, high wear resistance and good wear reduction, and can meet the requirements of surfacing and re-surfacing of the oil wear-resistant belt.

[0043] (2) The Cr13 series stainless steel gas shielded flux-cored wire for surfacing, by optimizing the carbon content in the welding wire, the hardness and the carbide are matched; by optimizing the alloy content of the welding wire, the wear resistance and toughness are improved, and the stability of the surfacing material is improved; by optimizing the mineral and compound components, it has good process performance, especially the reduction of spatter and porosity; finally, not only good process performance is obtained, but also high hardness and high crack resistance. The hardness of the deposited metal in the as-welded state is greater than or equal to 57HRc; the V-shaped notch impact toughness is greater than 10 J / cm 2 Therefore, it has excellent crack resistance. The field drill pipe surface surfacing test results show that when preheated to 120℃ or above, the annular weld joint has no cracks, and after machining, it fully meets the practical requirements. BRIEF DESCRIPTION OF DRAWINGS

[0044] The accompanying drawings, which form a part of the present application, are used to provide further understanding of the present application, and the illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0045] Figure 1 is the physical picture after surfacing with the welding wire in Example 1;

[0046] Figure 2 is the physical picture after surfacing with the welding wire in Comparative Example 1;

[0047] Figure 3 is the physical picture after surfacing with the welding wire in Comparative Example 2;

[0048] Figure 4 is the physical picture after surfacing with the welding wire in Comparative Example 3;

[0049] Figure 5 is the metallographic structure picture after welding of Example 1. DETAILED DESCRIPTION

[0050] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0051] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0052] The components in the following embodiments meet the following conditions:

[0053] The mass percentage of Cr in the high-carbon chromium iron is more than 64%, and the mass percentage of C is more than 8%;

[0054] The mass percentage of Cr in the micro-carbon chromium iron is more than 68%, and the mass percentage of C is less than 0.035%;

[0055] The mass percentage of Si in the ferrosilicon is more than 74%;

[0056] The mass percentage of Ti in the ferrotitanium is more than 25%;

[0057] The mass percentage of V in the ferrovanadium is 50%-70%;

[0058] The mass percentage of Nb in the ferro-niobium is 60%-70%;

[0059] The mass percentage of B in the ferroboron is more than 20%;

[0060] The mass percentage of Zr in the zirconium-silicon powder is 1-2%;

[0061] The purity of the manganese powder, graphite and titanium carbide respectively reaches more than 99%.

[0062] Embodiment 1

[0063] The Cr13 series stainless steel gas protection flux-cored wire for surfacing includes the following components:

[0064] cryolite: 12g; zirconium-silicon powder: 4g; potassium titanate: 1g; ferrotitanium: 60g; high-carbon chromium iron: 200g; titanium carbide: 70g; graphite: 40g; micro-carbon chromium iron: 480g; ferro-niobium: 76g; ferrovanadium: 12g; ferrosilicon: 30g; manganese powder: 15g, and the balance is iron powder, with a total of 1000g of powder.

[0065] high-carbon chromium iron: titanium carbide: graphite = 20:7:4 = 1:0.35:0.2;

[0066] titanium carbide: ferrotitanium = 70:60 = 1.17;

[0067] (titanium carbide + ferrotitanium): (ferro-niobium + ferrovanadium) = (70+60):(76+12) = 1.48.

[0068] The above welding wire powder is wrapped with steel belt to make flux-cored wire with a diameter of Φ1.6 mm. The steel belt adopts ordinary carbon steel belt H08A, the thickness is 0.5 mm, the width is 14 mm, and the filling rate is 26%.

[0069] Example 2

[0070] The gas shielded flux-cored wire for Cr13 stainless steel surfacing includes the following components:

[0071] cryolite: 2g; zirconium silicon powder: 3g; potassium titanate: 5g; titanium iron: 42g; high-carbon chromium iron: 300g; titanium carbide: 50g; graphite: 56g; micro-carbon chromium iron: 425g; niobium iron: 20g; vanadium iron: 30g; silicon iron: 50g; manganese powder: 9g; boron iron: 8g; the balance is iron powder, a total of 1000g powder.

[0072] high-carbon chromium iron: titanium carbide: graphite = 300: 50: 56 = 1: 0.17: 0.19;

[0073] titanium carbide: titanium iron = 50: 42 = 1.19;

[0074] (titanium carbide + titanium iron): (niobium iron + vanadium iron) = (50 + 42): (20 + 30) = 1.84.

[0075] The above welding wire powder is wrapped with steel belt to make flux-cored wire with a diameter of Φ1.6 mm. The steel belt adopts ordinary carbon steel belt H08A, the thickness is 0.4 mm, the width is 14 mm, and the filling rate is 26%.

[0076] Example 3

[0077] The gas shielded flux-cored wire for Cr13 stainless steel surfacing includes the following components:

[0078] cryolite: 8g; zirconium silicon powder: 2g; potassium titanate: 4g; titanium iron: 35g; high-carbon chromium iron: 320g; titanium carbide: 43g; graphite: 40g; micro-carbon chromium iron: 465g; niobium iron: 12g; vanadium iron: 20g; silicon iron: 35g; manganese powder: 16g; the balance is iron powder, a total of 1000g powder.

[0079] high-carbon chromium iron: titanium carbide: graphite = 320: 43: 40 = 1: 0.134: 0.125;

[0080] titanium carbide: titanium iron = 43: 35 = 1.23;

[0081] (titanium carbide + titanium iron): (niobium iron + vanadium iron) = (43 + 35): (20 + 12) = 2.44.

[0082] The above welding wire powder is wrapped with steel belt to make flux-cored wire with diameter of Φ1.6mm. The steel belt adopts common carbon steel belt H08A, thickness is 0.4mm, width is 14mm, and filling rate is 26%.

[0083] Comparative Example 1 The content of titanium carbide and graphite exceeds the standard and the ratio is not consistent

[0084] The gas shielded flux-cored wire for Cr13 stainless steel surfacing includes the following components:

[0085] Cryolite: 12g; zirconium silicon powder: 4g; potassium titanate: 1g; titanium iron: 60g; high-carbon chromium iron: 200g; titanium carbide: 18g; graphite: 92g; micro-carbon chromium iron: 480g; niobium iron: 76g; vanadium iron: 12g; silicon iron: 30g; manganese powder: 15g, and the balance is iron powder, totaling 1000g of powder.

[0086] High-carbon chromium iron: titanium carbide: graphite = 200: 18: 92 = 1: 0.09: 0.46;

[0087] Titanium carbide: titanium iron = 18: 60 = 0.3;

[0088] (Titanium carbide + titanium iron): (niobium iron + vanadium iron) = (18 + 60): (76 + 12) = 0.89.

[0089] The above welding wire powder is wrapped with steel belt to make flux-cored wire with diameter of Φ1.6mm. The steel belt adopts common carbon steel belt H08A, thickness is 0.5mm, width is 14mm, and filling rate is 26%.

[0090] Comparative Example 2 The ratio of high-carbon chromium iron, titanium carbide and graphite is not consistent

[0091] The gas shielded flux-cored wire for Cr13 stainless steel surfacing includes the following components:

[0092] Cryolite: 12g; zirconium silicon powder: 4g; potassium titanate: 1g; titanium iron: 60g; high-carbon chromium iron: 200g; titanium carbide: 102g; graphite: 8g; micro-carbon chromium iron: 480g; niobium iron: 76g; vanadium iron: 12g; silicon iron: 30g; manganese powder: 15g, and the balance is iron powder, totaling 1000g of powder.

[0093] High-carbon chromium iron: titanium carbide: graphite = 200: 102: 8 = 1: 0.51: 0.04;

[0094] Titanium carbide: titanium iron = 102: 60 = 1.7;

[0095] (Titanium carbide + titanium iron): (niobium iron + vanadium iron) = (102 + 60): (76 + 12) = 1.84.

[0096] The above welding wire powder is wrapped with steel belt to make flux-cored wire with a diameter of Φ1.6 mm. The steel belt adopts ordinary carbon steel belt H08A, with a thickness of 0.5 mm, a width of 14 mm, and a filling rate of 26%.

[0097] Comparative Example 3: Lack of zirconium silicon powder

[0098] The Cr13 series stainless steel surfacing gas shielded flux-cored wire comprises the following components:

[0099] Cryolite: 12 g; Potassium titanate: 1 g; Titanium iron: 60 g; High-carbon chromium iron: 200 g; Titanium carbide: 70 g; Graphite: 40 g; Micro-carbon chromium iron: 480 g; Niobium iron: 76 g; Vanadium iron: 12 g; Silicon iron: 30 g; Manganese powder: 15 g, and the balance is iron powder, totaling 1000 g of powder.

[0100] The above welding wire powder is wrapped with steel belt to make flux-cored wire with a diameter of Φ1.6 mm. The steel belt adopts ordinary carbon steel belt H08A, with a thickness of 0.5 mm, a width of 14 mm, and a filling rate of 26%.

[0101] Comparative Example 4: Titanium iron content exceeds the standard and the ratio is inconsistent

[0102] The Cr13 series stainless steel surfacing gas shielded flux-cored wire comprises the following components:

[0103] Cryolite: 12 g; Zirconium silicon powder: 4 g; Potassium titanate: 1 g; Titanium iron: 110 g; High-carbon chromium iron: 200 g; Titanium carbide: 20 g; Graphite: 40 g; Micro-carbon chromium iron: 480 g; Niobium iron: 76 g; Vanadium iron: 12 g; Silicon iron: 30 g; Manganese powder: 15 g, and the balance is iron powder, totaling 1000 g of powder.

[0104] High-carbon chromium iron: titanium carbide: graphite = 200:20:40 = 1:0.1:0.2;

[0105] Titanium carbide: titanium iron = 20:110 = 1:5.5 = 0.18;

[0106] (Titanium carbide + titanium iron): (niobium iron + vanadium iron) = (20+110): (76+12) = 1.48.

[0107] The above welding wire powder is wrapped with steel belt to make flux-cored wire with a diameter of Φ1.6 mm. The steel belt adopts ordinary carbon steel belt H08A, with a thickness of 0.5 mm, a width of 14 mm, and a filling rate of 26%.

[0108] Comparative Example 5: (Titanium carbide + titanium iron): (Niobium iron + vanadium iron) ratio is too low

[0109] The Cr13 series stainless steel surfacing gas shielded flux-cored wire comprises the following components:

[0110] cryolite: 12g; zirconium silicon powder: 4g; potassium titanate: 1g; titanium iron: 30g; high-carbon chromium iron: 200g; titanium carbide: 40g; graphite: 40g; micro-carbon chromium iron: 480g; niobium iron: 106g; vanadium iron: 42g; silicon iron: 30g; manganese powder: 15g, and the balance is iron powder, totaling 1000g of powder.

[0111] high-carbon chromium iron: titanium carbide: graphite = 200:40:40 = 1:0.2:0.2;

[0112] titanium carbide: titanium iron = 40:30 = 1.33;

[0113] (titanium carbide + titanium iron): (vanadium iron + niobium iron) = 70:148 = 0.47.

[0114] The above welding wire powder is wrapped with a steel belt to form a flux-cored welding wire with a diameter of Φ1.6mm. The steel belt is a common carbon steel belt H08A with a thickness of 0.5mm and a width of 14mm, and the filling rate is 26%.

[0115] When the ratio of (titanium carbide + titanium iron): (niobium iron + vanadium iron) is too low, the welding powder per kilogram is about 10 yuan more than that of Example 1, i.e. the welding wire per ton is about 3000 yuan more expensive, which is low in cost performance.

[0116] The mass percentages of the main alloying components in the flux-cored welding wires in the above examples and comparative examples are shown in Table 1 below.

[0117] Table 1 Mass percentages (wt%) of main alloying components in cladding materials

[0118]

[0119] 1. The welding wires of the above examples and comparative examples are used for on-site drill rod surface cladding tests, and the results are shown in Figures 1-4 .

[0120] The results after welding of Examples 1-3 are the same, and are shown in Figure 1 the actual post-welding photos of Example 1. The content of each component, the ratio of high-carbon chromium iron, titanium carbide and graphite, and the ratio of titanium carbide and titanium iron of Examples 1-3 all meet the requirements, the welding bead is well formed, and the post-welding surface is defect-free.

[0121] The high-carbon chromium iron: titanium carbide: graphite of Comparative Example 1 is 1:0.09:0.46, and the post-welding actual photo is shown in Figure 2 . The welding produces a lot of smoke, the wire drawing is not smooth, and the post-welding roller surface has cracks.

[0122] The high-carbon chromium iron: titanium carbide: graphite of Comparative Example 2 is 1:0.51:0.04, and the post-welding actual photo is shown in Figure 3 . The welding produces a lot of spatter, the welding bead surface is uneven, and pores are generated.

[0123] Comparative Example 3, compared with Example 1, the zirconium silicon powder is removed, the surface is as shown, the welding bead is not round, the forming is poor, the wettability is not good, and the machine is easy to fall off after being put on. Figure 4

[0124] Comparative Example 4, compared with Example 1, titanium carbide: titanium iron = 1:5.5, the content of titanium iron is too high, which leads to serious burning loss of titanium iron, and the hardness after welding is low, which is 54.9HRC, but the process performance is good, as shown in Table 2.

[0125] Comparative Example 5 has little difference in the performance of the welding wire obtained from Example 1, but its price is expensive, and it is not suitable for batch production.

[0126] 2, based on the welding process of Examples 1-3 and Comparative Example 4, the surfacing test sample can be prepared, that is, the surfacing test sample does not produce defects such as slag inclusion, porosity and cracks, and then the flux-cored wires in Examples 1-3 and Comparative Example 4 are used for gas protection surfacing on a test plate with length x width x height = 200mm x 400mm x 30mm, and the surfacing thickness is 15mm according to the surfacing test sample of YB / T4326-2013. The specific surfacing process is as follows:

[0127] (1) preheat the test sample, and the preheating temperature is 150℃;

[0128] (2) use the flux-cored wires in Examples 1-3 and Comparative Example 4 for gas protection surfacing, and the surfacing parameters are as follows:

[0129] Protective gas: carbon dioxide;

[0130] Gas flow: 22ml / min;

[0131] Welding current I: 360A;

[0132] Welding voltage U: 33V;

[0133] (3) slow cool the welded test sample, and the slow cooling speed is 60℃ / h to room temperature;

[0134] Figure 5 The metallographic structure diagram of Example 1 after welding is martensite, in which the austenite is about 10%, and a certain amount of carbide is precipitated between the dendrites.

[0135] The metallographic structure diagram of Examples 2-3 and Comparative Example 4 after surfacing treatment is also martensite and 7-15% austenite.

[0136] According to the sample and measurement requirements shown in YB / T4326-2013, impact test samples are prepared on the cover layer of the test plate, and the results are shown in Table 2.

[0137] ​Table 2 Partial mechanical properties of the cladding material at different temperatures

[0138]

[0139] It can be seen that, compared with Example 1, the titanium carbide:titanium iron = 1:5.5 in Comparative Example 4, the titanium iron content is too high, resulting in a low hardness of 54.9 HRC after welding.

[0140] In Examples 1-3, the requirements of the present application are met: the high-carbon chromium iron, the titanium carbide and the graphite satisfy the following relationship: high-carbon chromium iron:titanium carbide:graphite = 1:0.1-0.4:0.05-0.2, the titanium carbide:titanium iron = 0.8-1.5, and 0.1-0.45% of white zirconium silicon powder is added. Therefore, the process performance and the mechanical properties are both good.

[0141] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A Cr13-based stainless steel gas shielded flux-cored wire for hardfacing, characterized by: The welding wire comprises the following components by weight percentage: cryolite: 0.2%-1.5%; zirconium silicon powder: 0.1-0.45%; potassium titanate: 0.1%-1%; titanium iron: 1.0%-6%; high-carbon chromium iron: 20%-35%; titanium carbide: 1.8-11%; graphite: 0.8-7.0%; micro-carbon chromium iron: 40-52%; niobium iron: 1-8%; vanadium iron: 1.0-4.0%; silicon iron: 1.0%-5.5%; manganese powder: 0.5%-2.5%; boron iron: 0-1.4%; and the balance is iron powder. The mass ratio of high-carbon chromium iron, titanium carbide, and graphite is 1:0.1-0.4:0.05-0.

2. The mass ratio of titanium carbide to titanium iron is 0.8-1.

5. The mass ratio of titanium carbide and titanium iron to niobium iron and vanadium iron is >0.

85.

2. The Cr13-based stainless steel gas shielded flux-cored wire for hardfacing according to claim 1, characterized by: The mass percentage of Ti in the titanium iron is 25% or more.

3. The Cr13-based stainless steel gas shielded flux-cored wire for hardfacing according to claim 2, characterized by: The mass percentage of Cr in the high-carbon chromium iron is 64% or more, and the mass percentage of C is 8% or more.

4. The Cr13-based stainless steel gas shielded flux-cored wire for hardfacing according to claim 1, characterized by: The mass percentage of Cr in the micro-carbon chromium iron is 68% or more, and the mass percentage of C is 0.035% or less. The mass percentage of Si in the silicon iron is 74% or more. The mass percentage of V in the vanadium iron is 50%-70%. The mass percentage of Nb in the niobium iron is 60%-70%. The mass percentage of B in the boron iron is 20% or more. The mass percentage of Zr in the zirconium silicon powder is 1-2%. The purity of the manganese powder, graphite, and titanium carbide respectively reaches 99% or more. The deposited metal of the welding wire comprises the following components by weight percentage:

5. The Cr13-based stainless steel gas shielded flux-cored wire for hardfacing according to claim 1, characterized by: Nb: 0.1%-2.0%; C：0.80%-1.40%； Cr：11.5%-13.5%； Mn: 0.1%-1%; V：0.1-1.0%； Si: 0.2%-1.1%; Ti: 0.6-2.0% The balance is Fe. B：0-0.1%， Zr：0-0.04%； The diameter of the welding wire is 1.6mm, and the hardness of the deposited metal of the welding wire in the welding state is ≥57HRc.

6. The Cr13-based stainless steel gas shielded flux-cored wire for hardfacing according to claim 1, characterized by: The method comprises the following steps:

7. A surfacing method of a Cr13-based stainless steel gas shielded flux-cored wire for surfacing as claimed in any one of claims 1 to 6, characterized in that: (1) using the welding wire for gas protection surfacing; (2) slowly cooling the welded part after welding; (3) cooling the welded part to room temperature. Before step (1), the welded part is also preheated, and the preheating temperature is not less than 120℃.

8. The overlaying method of the Cr13-based stainless steel gas shielded flux-cored wire for overlaying according to claim 7, characterized by: In step (1), the gas in the gas protection is one or both of carbon dioxide and argon, and the gas flow is 20-28ml / min; the surfacing welding current is 280-400A, and the welding voltage is 32-38V.

9. The overlaying method of the Cr13-based stainless steel gas shielded flux-cored wire for overlaying according to claim 7, characterized by: In step (2), the slow cooling speed is 55℃ / h-75℃ / h. ​

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