Ferritic stainless steel wire for ship welding and preparation method thereof

Abstract

The invention discloses a ferritic stainless steel wire for ship welding and a preparation method thereof. The preparation method comprises the steps of converter smelting, VOD furnace refining, LF furnace refining, ingot die casting, initial rolling, billet annealing and wire rolling. The chemical composition of the ferritic stainless steel wire for ship welding is controlled as follows by weight percentage: C≤0.020%, Si: 0.15-0.35%, Mn: 0.15-0.35%, P≤0.020%, S≤0.015%, Cr: 10.50-11.00%, Ni: 0.35-0.50%, Mo: 0.35-0.50%, Nb: 0.15-0.35%, Ti: 0.15-0.35%, N≤0.020%. The chemical composition of the ferritic stainless steel wire for ship welding of the present invention is stable, and the preparation method of the ferritic stainless steel wire for ship welding of the present invention is advanced and reliable, which fills the technical gap of ferritic stainless steel wire for ship welding in my country, meets the use and industrial production needs of ship welding, and can ensure the stability of welding performance during ship welding, so that the ship welding quality is good, completely replaces imported products, and effectively reduces production costs.

Description

Technical Field

[0001] The invention belongs to the technical field of new stainless steel materials, and in particular relates to a ferritic stainless steel wire for ship welding and a preparation method thereof. Background Art

[0002] The welding workload in the shipbuilding process is very large and requires a large amount of welding materials. For example, a 100,000-ton ship uses about 500 tons of welding materials. Since ships are high-risk special products, there are extremely high requirements for the performance and quality of welding materials.

[0003] Ferritic stainless steel wire for ship welding is drawn into φ2.0~4.0mm welding rods, which are specially used for surface cladding of ship decks, hulls and other parts. It has high requirements on welding quality stability and hardness of deposited metal after welding, and has high added value. The annual domestic demand is more than 2,000 tons. It is currently mainly dependent on imports and is still in its infancy in China. However, due to the lack of reliable composition control technology and preparation process, its product quality is uneven, the chemical composition fluctuates greatly, and the welding performance is unstable, which seriously restricts the use of ship welding and industrial production.

[0004] Therefore, developing a ferritic stainless steel wire for ship welding and a preparation method thereof, stabilizing the chemical composition, improving product quality, and enhancing the welding performance during ship welding, and filling the technical gap in ferritic stainless steel wire for ship welding in my country have become technical problems that need to be urgently solved in this field. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a ferritic stainless steel wire for ship welding and a preparation method thereof.

[0006] The chemical composition of the ferritic stainless steel wire for ship welding provided by the present invention is controlled as follows by weight percentage: C≤0.020%, Si: 0.15-0.35%, Mn: 0.15-0.35%, P≤0.020%, S≤0.015%, Cr: 10.50-11.00%, Ni: 0.35-0.50%, Mo: 0.35-0.50%, Nb: 0.15-0.35%, Ti: 0.15-0.35%, N≤0.020%, and the rest is Fe and unavoidable impurities.

[0007] Preferably, the chemical composition of the above-mentioned ferritic stainless steel wire for ship welding is controlled by weight percentage as follows: C: 0.007%, Si: 0.25%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.68%, Ni: 0.42%, Mo: 0.41%, Nb: 0.21%, Ti: 0.30%, N: 0.010%.

[0008] Preferably, the chemical composition of the above-mentioned ferritic stainless steel wire for ship welding is controlled by weight percentage as follows: C: 0.008%, Si: 0.31%, Mn: 0.32%, P: 0.017%, S: 0.001%, Cr: 10.81%, Ni: 0.42%, Mo: 0.41%, Nb: 0.23%, Ti: 0.26%, N: 0.009%.

[0009] Preferably, the chemical composition of the above-mentioned ferritic stainless steel wire for ship welding is controlled by weight percentage as follows: C: 0.008%, Si: 0.26%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.72%, Ni: 0.39%, Mo: 0.41%, Nb: 0.21%, Ti: 0.32%, N: 0.008%.

[0010] Furthermore, the specification of the ferritic stainless steel wire for ship welding is Φ5.5mm.

[0011] The method for preparing ferritic stainless steel wire for ship welding provided by the present invention comprises the following steps: converter smelting, VOD furnace refining, LF furnace refining, ingot die casting, initial rolling, billet annealing and wire rolling, wherein:

[0012] In the converter smelting step, the C content in the molten steel is controlled to be 0.20-0.30% by weight, the P content is controlled to be P≤0.025% by weight, the post-furnace temperature is controlled to be ≥1630°C, and the slag thickness is controlled to be ≤50mm;

[0013] In the VOD furnace refining step, the inlet temperature is controlled to be ≥1600℃, the slag thickness is controlled to be ≤50mm, the boiling time after the oxygen blowing is completed is controlled to be >15 minutes, the vacuum degree is controlled to be ≤2mbar, and the continuous holding time is controlled to be >6 minutes;

[0014] In the LF furnace refining step, the chemical composition of the molten steel is adjusted to the following by weight percentage: C≤0.020%, Si: 0.15-0.35%, Mn: 0.15-0.35%, P≤0.020%, S≤0.015%, Cr: 10.50-11.00%, Ni: 0.35-0.50%, Mo: 0.35-0.50%, Nb: 0.15-0.35%, Ti: 0.15-0.35%, N≤0.020%, and the weak stirring time is controlled to be ≥15 minutes;

[0015] In the ingot casting step, the time from the molten steel leaving the LF furnace to the start of pouring is controlled to be less than 25 minutes, the mold temperature is controlled to be ≥60°C, the pouring temperature is controlled to be 1585-1605°C, the ingot body pouring time is controlled to be 9-12 minutes, the cap mouth pouring time is controlled to be 6-9 minutes, and the cap mouth height is controlled to be ≥330mm;

[0016] In the initial rolling step, the steel ingot is first kept warm in a soaking furnace at a temperature of 1100-1200°C for 2-3 hours, and then rolled into a square billet by a preliminary rolling mill.

[0017] In the billet annealing step, the annealing furnace is kept at a temperature of 730-750°C, the holding time is controlled to be 3-5 hours, and after the holding is completed, the billet is taken out of the furnace and air-cooled to room temperature;

[0018] In the wire rolling step, the square billet is loaded into a walking beam heating furnace, the temperature of the soaking section is controlled at 1050-1150°C, the holding time is controlled at 2-3 hours, the rough rolling bite temperature is controlled at ≥950°C, and the wire drawing temperature is controlled at ≤900°C.

[0019] Furthermore, in the above-mentioned method for preparing ferritic stainless steel wire for ship welding, in the ingot casting step, the molten steel is cast into a 5.8-ton rectangular ingot; in the initial rolling step, the 5.8-ton rectangular ingot is rolled into a square billet with a size of 220×220×3300~3500mm by the initial rolling mill; in the wire rolling step, the square billet of 220×220×3300~3500mm is rolled into a Φ5.5mm wire.

[0020] Preferably, in the above-mentioned method for preparing ferritic stainless steel wire for ship welding, in the LF furnace refining step, the chemical composition of the molten steel is adjusted by weight percentage to: C: 0.007%, Si: 0.25%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.68%, Ni: 0.42%, Mo: 0.41%, Nb: 0.21%, Ti: 0.30%, N: 0.010%.

[0021] Preferably, in the above-mentioned method for preparing ferritic stainless steel wire for ship welding, in the LF furnace refining step, the chemical composition of the molten steel is adjusted by weight percentage to: C: 0.008%, Si: 0.31%, Mn: 0.32%, P: 0.017%, S: 0.001%, Cr: 10.81%, Ni: 0.42%, Mo: 0.41%, Nb: 0.23%, Ti: 0.26%, N: 0.009%.

[0022] Preferably, in the above-mentioned method for preparing ferritic stainless steel wire for ship welding, in the LF furnace refining step, the chemical composition of the molten steel is adjusted by weight percentage to: C: 0.008%, Si: 0.26%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.72%, Ni: 0.39%, Mo: 0.41%, Nb: 0.21%, Ti: 0.32%, N: 0.008%.

[0023] The ferritic stainless steel wire for ship welding and the preparation method thereof of the present invention have the following advantages and beneficial effects:

[0024] The chemical composition of the ferritic stainless steel wire for ship welding of the present invention is stable, and the preparation method of the ferritic stainless steel wire for ship welding of the present invention is advanced and reliable, which fills the technical gap of ferritic stainless steel wire for ship welding in my country, meets the use and industrial production needs of ship welding, and can ensure the stability of welding performance during ship welding, so that the ship welding quality is good, completely replaces imported products, and effectively reduces production costs. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] The chemical composition of the ferritic stainless steel wire for ship welding of the present invention is controlled by weight percentage as follows: C≤0.020%, Si: 0.15-0.35%, Mn: 0.15-0.35%, P≤0.020%, S≤0.015%, Cr: 10.50-11.00%, Ni: 0.35-0.50%, Mo: 0.35-0.50%, Nb: 0.15-0.35%, Ti: 0.15-0.35%, N≤0.020%, and the rest is Fe and unavoidable impurities.

[0027] Preferably, the chemical composition of the ferritic stainless steel wire for ship welding of the present invention is controlled by weight percentage as follows: C: 0.007%, Si: 0.25%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.68%, Ni: 0.42%, Mo: 0.41%, Nb: 0.21%, Ti: 0.30%, N: 0.010%.

[0028] Preferably, the chemical composition of the ferritic stainless steel wire for ship welding of the present invention is controlled by weight percentage as follows: C: 0.008%, Si: 0.31%, Mn: 0.32%, P: 0.017%, S: 0.001%, Cr: 10.81%, Ni: 0.42%, Mo: 0.41%, Nb: 0.23%, Ti: 0.26%, N: 0.009%.

[0029] Preferably, the chemical composition of the ferritic stainless steel wire for ship welding of the present invention is controlled by weight percentage as follows: C: 0.008%, Si: 0.26%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.72%, Ni: 0.39%, Mo: 0.41%, Nb: 0.21%, Ti: 0.32%, N: 0.008%.

[0030] According to actual use requirements, the specification of the ferritic stainless steel wire for ship welding of the present invention is Φ5.5mm, which can be processed into φ2.0-4.0mm welding rods in later applications for welding of ship decks, hulls and other parts.

[0031] The method for preparing ferritic stainless steel wire for ship welding of the present invention comprises the following steps: converter smelting, VOD furnace refining, LF furnace refining, ingot die casting, initial rolling, billet annealing and wire rolling, wherein:

[0032] In the converter smelting step, the C content in the molten steel is controlled to be 0.20-0.30% by weight, the P content is controlled to be P≤0.025% by weight, the post-furnace temperature is controlled to be ≥1630°C, and the slag thickness is controlled to be ≤50mm;

[0033] In the VOD furnace refining step, the inlet temperature is controlled to be ≥1600℃, the slag thickness is controlled to be ≤50mm, the boiling time after the oxygen blowing is completed is controlled to be >15 minutes, the vacuum degree is controlled to be ≤2mbar, and the continuous holding time is controlled to be >6 minutes;

[0034] In the LF furnace refining step, the chemical composition of the molten steel is adjusted to the following by weight percentage: C≤0.020%, Si: 0.15-0.35%, Mn: 0.15-0.35%, P≤0.020%, S≤0.015%, Cr: 10.50-11.00%, Ni: 0.35-0.50%, Mo: 0.35-0.50%, Nb: 0.15-0.35%, Ti: 0.15-0.35%, N≤0.020%, and the weak stirring time is controlled to ≥15 minutes to ensure that the molten steel is not exposed;

[0035] In the ingot casting step, the time from the molten steel leaving the LF furnace to the start of pouring is controlled to be less than 25 minutes, the mold temperature is controlled to be ≥60°C, the cold mold baking time is controlled to be >3 hours, the pouring temperature is controlled to be 1585-1605°C, the ingot body pouring time is controlled to be 9-12 minutes, the cap mouth pouring time is controlled to be 6-9 minutes, and the cap mouth height is controlled to be ≥330mm;

[0036] In the initial rolling step, the steel ingot is first kept warm in a soaking furnace at a temperature of 1100-1200°C for 2-3 hours, and then rolled into a square billet by a preliminary rolling mill.

[0037] In the billet annealing step, the annealing furnace is kept at a temperature of 730-750°C, the holding time is controlled to be 3-5 hours, and after the holding is completed, the billet is taken out of the furnace and air-cooled to room temperature;

[0038] In the wire rolling step, the square billet is loaded into a walking-beam heating furnace, the temperature of the soaking section is controlled at 1050-1150°C, the holding time is controlled at 2-3 hours, the rough rolling bite temperature is controlled at ≥950°C, the wire drawing temperature is controlled at ≤900°C, and the wire is rolled into wire.

[0039] Furthermore, in the method for preparing ferritic stainless steel wire for ship welding of the present invention, in the ingot casting step, the molten steel is cast into a 5.8-ton rectangular ingot.

[0040] Furthermore, in the method for preparing ferritic stainless steel wire for ship welding of the present invention, in the initial rolling and blooming step, a 5.8-ton rectangular steel ingot is rolled into a square billet with a size of 220×220×3300-3500 mm by a primary rolling mill.

[0041] Furthermore, in the method for preparing ferritic stainless steel wire for ship welding of the present invention, in the wire rolling step, a square billet of 220×220×3300-3500 mm is rolled into a Φ5.5 mm wire.

[0042] The wire prepared by the method for preparing ferritic stainless steel wire for ship welding of the present invention can be processed into welding rods with a diameter of 2.0 to 4.0 mm in later applications, and can be used for welding of ship decks, hulls and other parts.

[0043] In the ferritic stainless steel wire for ship welding and the preparation method thereof of the present invention, the chemical composition system and content of the ferritic stainless steel wire are controlled because:

[0044] C, N: Both are austenite forming elements, which can improve the strength and hardness of steel, but deteriorate the plasticity, toughness and welding performance. In addition, they easily react with Cr to form CrC and CrN, resulting in Cr-poor matrix near the grain boundary and reduced corrosion resistance. Therefore, the C and N contents should be reduced as much as possible. Therefore, in the present invention, it is preferably controlled to be C≤0.020% and N≤0.020%.

[0045] Nb and Ti: As dual stabilizing elements, adding 0.10% or more can further fix C and N, inhibit the formation of CrC and CrN, and improve corrosion resistance. However, when the addition amount is ≥0.50%, coarse C and N compounds will be formed, reducing the cold workability and toughness of the steel. Therefore, in the present invention, it is preferably controlled to Nb: 0.15-0.35% and Ti: 0.15-0.35%.

[0046] Si: is a ferrite-forming element and is added as a deoxidizer at 0.10% or more. However, when the addition amount is ≥1%, columnar crystals in the cast steel will develop, reducing the plasticity and toughness during processing. At the same time, due to the strong binding ability of Si and O, more SiO2 is generated, which has a high melting point (about 1710°C) and small particles. It is difficult to float out of the welding pool, and slag inclusions are easily formed in the weld metal, affecting the welding quality. Therefore, in the present invention, Si is preferably controlled to 0.15-0.35%.

[0047] Mn: Its function is similar to that of Si, but its deoxidation ability is slightly worse than that of Si. By adding Mn appropriately and using Si and Mn for deoxidation, manganese silicate (MnO·SiO2) is formed with low melting point (about 1270℃) and low density (3.6g / cm 3 ), it is easy to condense into large pieces and float out from the welding molten pool, and the deoxidation effect is good. Therefore, in the present invention, it is preferably controlled to be Mn: 0.15~0.35%.

[0048] P and S: Both are impurity elements. Due to their influence on plasticity, toughness, weldability and corrosion resistance, the lower the better. Therefore, in the present invention, it is preferably controlled to P≤0.020% and S≤0.015%.

[0049] Cr: In order to ensure the basic corrosion resistance of stainless steel, it is necessary to add 10.50% or more. Therefore, in the present invention, it is preferable to control Cr to 10.50-11.00%.

[0050] Ni: A small amount of addition can improve corrosion resistance, strength and toughness, reduce the ductile-brittle transition temperature, and inhibit grain growth at high temperatures while maintaining a fine grain structure. However, Ni is a strong austenite-forming element, and excessive addition will destroy the stability of the ferrite matrix. Therefore, in the present invention, it is preferably controlled to Ni: 0.35~0.50%.

[0051] Mo: The pitting corrosion resistance equivalent is 3.3 times that of Cr. Appropriate addition can improve corrosion resistance and refine grains. However, when the addition amount is ≥0.60%, precipitation phase is easily generated, which will reduce plasticity and toughness. Therefore, in the present invention, it is preferably controlled to Mo: 0.35~0.50%.

[0052] Based on the ferritic stainless steel wire for ship welding of the present invention, three different chemical composition ratios are selected, and the ferritic stainless steel wire for ship welding of the present invention is used to prepare the ferritic stainless steel wire for ship welding, as Examples 1, 2 and 3 of the present invention. The chemical composition of the ferritic stainless steel wire for ship welding of each embodiment is shown in Table 1 below:

[0053] Table 1 Chemical composition of ferritic stainless steel wire for ship welding (weight percentage, %)

[0054] C Si Mn P S Cr Ni Mo Ti Nb N Example 1 0.007 0.25 0.29 0.013 0.001 10.68 0.42 0.41 0.30 0.21 0.010 Example 2 0.008 0.31 0.32 0.017 0.001 10.81 0.42 0.41 0.26 0.23 0.009 Example 3 0.008 0.26 0.29 0.013 0.001 10.72 0.39 0.41 0.32 0.21 0.008

[0055] After actual test, the mechanical properties of the ferritic stainless steel wire for ship welding of Example 1, Example 2 and Example 3 of the present invention are shown in Table 2 below:

[0056] Table 2 Mechanical properties of ferritic stainless steel wire for ship welding

[0057] Tensile strength / MPa Elongation after break / % Sectional shrinkage / % Example 1 492 41 84 Example 2 480 37.5 75 Example 3 436 47 74

[0058] The imported ferritic stainless steel wire for ship welding is used as comparative example 1, and the ferritic stainless steel wire for ship welding currently produced in China is used as comparative example 2. The welding performance test is compared with the ferritic stainless steel wire for ship welding of the present invention. The comparison results are shown in Table 3 below:

[0059] Table 3 Comparison results of ferritic stainless steel wire welding performance test

[0060] Comparative Example 1 Comparative Example 2 TISCO Welding spatter Smooth, little splash There are fluctuations and large splashes Smooth, little splash Weld seam forming Silvery white, less welding slag Gray color, lots of welding slag Silvery white, less welding slag Rockwell hardness of deposited metal (HRC) 26～29 27～32 26～29

[0061] It can be seen that the wire prepared by the method for preparing ferritic stainless steel wire for ship welding of the present invention has stable welding performance when used for ship welding. Due to its stable chemical composition control and advanced and reliable processing and manufacturing technology, the product quality is significantly improved, the welding quality is good, and it reaches the level of imported products. It can completely replace imported products with higher costs and fill the technical gap in ferritic stainless steel wire for ship welding in my country.

[0062] In summary, compared with the prior art, the ferritic stainless steel wire for ship welding and the preparation method thereof of the present invention have the following advantages and beneficial effects:

[0063] The chemical composition of the ferritic stainless steel wire for ship welding of the present invention is stable, and the preparation method of the ferritic stainless steel wire for ship welding of the present invention is advanced and reliable, which fills the technical gap of ferritic stainless steel wire for ship welding in my country, meets the use and industrial production needs of ship welding, and can ensure the stability of welding performance during ship welding, so that the ship welding quality is good, completely replaces imported products, and effectively reduces production costs.

[0064] It should be noted that, in this article, the term "comprise" or any other variation thereof is intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such article or device.

[0065] It should also be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the present invention.

Claims

1. A method for preparing ferritic stainless steel wire for ship welding, comprising the following steps: converter smelting, VOD furnace refining, LF furnace refining, ingot die casting, initial rolling, billet annealing and wire rolling, characterized in that: In the converter smelting step, the C content in the molten steel is controlled to be 0.20-0.30% by weight, the P content is controlled to be P≤0.025% by weight, the post-furnace temperature is controlled to be ≥1630°C, and the slag thickness is controlled to be ≤50mm; In the VOD furnace refining step, the inlet temperature is controlled to be ≥1600℃, the slag thickness is controlled to be ≤50mm, the boiling time after the oxygen blowing is completed is controlled to be >15 minutes, the vacuum degree is controlled to be ≤2mbar, and the continuous holding time is controlled to be >6 minutes; In the LF furnace refining step, the chemical composition of the molten steel is adjusted to the following by weight percentage: C≤0.020%, Si: 0.15~0.35%, Mn: 0.15~0.35%, P≤0.020%, S≤0.015%, Cr: 10.50~11.00%, Ni: 0.35~0.50%, Mo: 0.35~0.50%, Nb: 0.15~0.35%, Ti: 0.15~0.35%, N≤0.020%, and the weak stirring time is controlled to be ≥15 minutes; In the ingot casting step, the time from the molten steel leaving the LF furnace to the start of pouring is controlled to be <25 minutes, the mold temperature is controlled to be ≥60°C, the pouring temperature is controlled to be 1585~1605°C, the ingot body pouring time is controlled to be 9~12 minutes, the cap mouth pouring time is controlled to be 6~9 minutes, and the cap mouth height is controlled to be ≥330mm; In the initial rolling process, the steel ingot is first kept warm in a soaking furnace at a temperature of 1100-1200°C for 2-3 hours, and then rolled into a square billet in a preliminary rolling mill. In the billet annealing step, the annealing furnace is kept at a temperature of 730-750°C for a holding time of 3-5 hours, and the billet is taken out of the furnace and air-cooled to room temperature after the holding time is completed; In the wire rolling step, the billet is loaded into a walking beam heating furnace, the soaking section temperature is controlled to be 1050-1150°C, the holding time is controlled to be 2-3 hours, the rough rolling bite temperature is controlled to be ≥950°C, and the wire laying temperature is controlled to be ≤900°C; In the steel ingot casting step, the molten steel is cast into a 5.8-ton rectangular steel ingot; in the initial rolling and blanking step, the 5.8-ton rectangular steel ingot is rolled into a square billet with a size of 220×220×3300-3500 mm by a preliminary rolling mill; In the wire rod rolling step, the 220×220×3300-3500 mm square billet is rolled into a Φ5.5 mm wire rod.

2. The method for preparing ferritic stainless steel wire for ship welding according to claim 1, characterized in that: In the LF furnace refining step, the chemical composition of the molten steel is adjusted by weight percentage to: C: 0.007%, Si: 0.25%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.68%, Ni: 0.42%, Mo: 0.41%, Nb: 0.21%, Ti: 0.30%, and N: 0.010%.

3. The method for preparing ferritic stainless steel wire for ship welding according to claim 1, characterized in that: In the LF furnace refining step, the chemical composition of the molten steel is adjusted by weight percentage to: C: 0.008%, Si: 0.31%, Mn: 0.32%, P: 0.017%, S: 0.001%, Cr: 10.81%, Ni: 0.42%, Mo: 0.41%, Nb: 0.23%, Ti: 0.26%, and N: 0.009%.

4. The method for preparing ferritic stainless steel wire for ship welding according to claim 1, characterized in that: In the LF furnace refining step, the chemical composition of the molten steel is adjusted by weight percentage to: C: 0.008%, Si: 0.26%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.72%, Ni: 0.39%, Mo: 0.41%, Nb: 0.21%, Ti: 0.32%, and N: 0.008%.

5. A ferritic stainless steel wire for ship welding prepared by the method for preparing a ferritic stainless steel wire for ship welding according to any one of claims 1 to 4, characterized in that: The specification of the ferritic stainless steel wire for ship welding is Φ5.5mm, and the chemical composition of the ferritic stainless steel wire for ship welding is controlled by weight percentage as follows: C≤0.020%, Si: 0.15~0.35%, Mn: 0.15~0.35%, P≤0.020%, S≤0.015%, Cr: 10.50~11.00%, Ni: 0.35~0.50%, Mo: 0.35~0.50%, Nb: 0.15~0.35%, Ti: 0.15~0.35%, N≤0.020%, and the rest is Fe and unavoidable impurities.

6. The ferritic stainless steel wire for ship welding according to claim 5, characterized in that: The chemical composition of the ferritic stainless steel wire for ship welding is controlled by weight percentage as follows: C: 0.007%, Si: 0.25%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.68%, Ni: 0.42%, Mo: 0.41%, Nb: 0.21%, Ti: 0.30%, and N: 0.010%.

7. The ferritic stainless steel wire for ship welding according to claim 5, characterized in that: The chemical composition of the ferritic stainless steel wire for ship welding is controlled by weight percentage as follows: C: 0.008%, Si: 0.31%, Mn: 0.32%, P: 0.017%, S: 0.001%, Cr: 10.81%, Ni: 0.42%, Mo: 0.41%, Nb: 0.23%, Ti: 0.26%, and N: 0.009%.

8. The ferritic stainless steel wire for ship welding according to claim 5, characterized in that: The chemical composition of the ferritic stainless steel wire for ship welding is controlled by weight percentage as follows: C: 0.008%, Si: 0.26%, Mn: 0.29%, P: 0.013%, S: 0.001%, Cr: 10.72%, Ni: 0.39%, Mo: 0.41%, Nb: 0.21%, Ti: 0.32%, and N: 0.008%.