Preparation method of high-strength non-magnetic round steel for large submarine cable armoring

Abstract

The invention discloses a preparation method of high-strength non-magnetic round steel for large submarine cable armoring, which comprises the following steps: S1, smelting and blank making: adopting a converter + LF furnace + plate blank continuous casting mode to obtain a Fe-Mn-Al-C series AM05 non-magnetic steel continuous casting plate blank with the thickness of 220mm; s2, cogging rolling is conducted, specifically, the continuous casting sheet billet obtained in the step S1 is heated to 1220-1240 DEG C in a heating furnace, and then cogging rolling is conducted; s3, cutting is conducted, specifically, the plate blank obtained in the step S2 is placed on a cutting machine rack through a clamp and tightly jacked; s4, hot rolling: rolling the cut square billets on a high-speed wire rod production line, putting the square billets into a heating furnace in batches in a centralized manner, and passing through a rough rolling non-hole type unit, an intermediate rolling hole type unit, a pre-finish rolling unit, a finish rolling unit and a reducing and sizing unit; and S5, wire drawing is conducted, specifically, the hot-rolled round wire rod wire drawing material with the diameter phi being 6.5-8 mm is subjected to membrane treatment and dried, and single-pass or multi-pass drawing is conducted on a wire drawing machine.

Description

Technical Field

[0001] The invention relates to the technical field of submarine cables, and in particular to a method for preparing high-strength non-magnetic round steel for large submarine cable armoring. Background Art

[0002] The addition of armor layers to large power transmission cables can enhance mechanical protection such as tensile strength and compressive strength and extend service life. It also has good resistance to low-frequency interference and magnetic shielding effects, effectively reducing the increase in AC resistance of cable conductors and shielding, and plays a role in shielding, protecting and improving the cable's current carrying capacity. However, the non-magnetic materials copper and aluminum currently used in the outer layer of the armor have excellent magnetic properties but low strength and are expensive. Austenitic stainless steel produces magnetism during magnetic cold drawing, and has low strength and no magnetism. The deep-sea laying usually involved in offshore wind power and island connection projects has increased with the increase in the weight of submarine cables. Ordinary non-magnetic armored steel wires can no longer meet the high tension requirements required for laying.

[0003] High manganese non-magnetic steel is a high-aluminum high-manganese alloy steel with extremely low magnetism. Its main components are iron, manganese, aluminum, vanadium and other elements. Its magnetic permeability is much lower than that of ordinary steel, and it has good magnetic shielding performance, which can effectively block the influence of external magnetic field on equipment; it not only has high strength and hardness, but also has good corrosion resistance and heat resistance. It is a very good choice of armor steel with good mechanical properties and cost-effectiveness.

[0004] However, the high content of Mn and Al in Fe-Mn-Al-C non-magnetic steel makes the continuous casting process of square billets extremely difficult, so there are few Fe-Mn-Al-C non-magnetic round steels. In the prior art, the invention patent with application number 202410192156.8 discloses a method for preparing zero-magnetic steel bars for special non-magnetic concrete structures. The zero-magnetic steel bars produced by this production method have multiple advantages such as zero magnetism, high strength, good ductility, corrosion resistance and shock resistance, and reasonable cost, which is suitable for industrial production and large-scale use. However, this method still obtains Fe-Mn-Al-C zero-magnetic steel bars by die-casting steel ingots, which has complex processes, high costs, low efficiency, and the die-casting steel ingot method causes the performance of the steel to be unable to be effectively guaranteed. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a method for preparing high-strength non-magnetic round steel for large submarine cable armoring.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows: A method for preparing high-strength non-magnetic round steel for large submarine cable armoring comprises the following steps: S1. Smelting and billet making: using converter + LF furnace + slab continuous casting method to obtain Fe-Mn-Al-C series AM05 non-magnetic steel continuous casting slab with a thickness of 220 mm; S2, slab rolling: the continuous casting slab obtained in step S1 is heated to 1220-1240° C. in a heating furnace and then slab rolled. The slab rolling is controlled to have a thickness of 140-160 mm, and a slab with an initial rolling thickness of 140-160 mm is obtained; S3, cutting: Use a clamp to place the slab obtained in step S2 on the cutting machine stand and tighten it, select N points with an equidistant distance of 150 to 160 mm on the two end faces of the slab according to the width of the slab after initial rolling, adjust the position of the flame cutting gun, control the slit width to be ≤8 mm, and cut out a square billet with a width of 145 to 155 mm. After cutting, remove the burrs after the billet is off the production line; S4, hot rolling: the cut billets are rolled on a high-speed wire production line, put into a heating furnace in batches, heated to 1180-1220°C and then taken out of the furnace, and then rolled into hot-rolled round wire rods with a diameter of φ6.5-φ8mm through a rough rolling unit without holes, a medium rolling unit with holes, a pre-finishing unit, a finishing unit and a sizing unit; S5. Wire drawing: The hot-rolled round wire rod with a diameter of φ6.5 to φ8 mm is treated with a coating and dried, and then single-pass or multi-pass drawing is performed on a wire drawing machine. After annealing, grinding, polishing and galvanizing, AM05 non-magnetic round steel with a diameter of φ3 to φ6 mm is finally obtained.

[0007] Among them, the AM05 non-magnetic round steel obtained in the step S5 has the following components in weight percentage: C: 0.05-0.20%, Si: 0.15-0.30%, Mn: 18-25%, A1: 1.0-2.0%, Nb+V+Ti: 0.04-0.08%, B+Zn: 0.0020-0.0050%, P≤0.045%, S≤0.03%, and the rest is Fe and unavoidable impurities.

[0008] Wherein, in step S3, the number of cutting points N of the flame cutting gun is determined according to the width of the slab after initial rolling and the cutting spacing, N=slab width / cutting spacing, wherein N is an integer.

[0009] Among them, in step S3, the cutting machine uses a flame cutting machine for processing flat steel rectangular billets, the cutting temperature of the ingot is 20-200°C, the energy medium used for cutting is cutting oxygen, cutting gas, and industrial purified water, the cutting seam is ≤8mm, and the cutting surface roughness is ≤2mm.

[0010] Among them, in step S4, when rolling on the high-speed wire production line, the rolling roll gap, material shape and speed are controlled according to conventional specifications, the wire laying temperature is controlled at 850°C, and the air cooling section adopts the front and middle section fast cooling + rear section air cooling control method.

[0011] The beneficial effects of the present invention are: 1. The high-strength non-magnetic round steel AM05 made by the present invention has physical properties that meet the requirements of yield strength Rp0.2≥500MPa, tensile strength Rm≥700MPa, and elongation A / %≥35% after wire drawing, and has excellent mechanical properties, which plays a role in protecting and extending the service life.

[0012] 2. After wire drawing, the high-strength non-magnetic round steel AM05 made by the present invention has a magnetic permeability of 1.000-1.002; a resistivity of 0.68Ω.m at room temperature and 0.75Ω.m at 100°C; an austenite content of ≥99.9%, a grain size of 11.5, and no demagnetization, thereby achieving non-magnetic control.

[0013] 3. The present invention improves the chemical corrosion resistance of non-magnetic round steel through drawing, annealing, grinding, polishing and galvanizing, and has reasonable cost and is suitable for industrial production and large-scale use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0015] Figure 1 This is the metallographic structure diagram of the φ6mm non-magnetic round steel wire drawing for armored cables produced by the present invention.

[0016] Figure 2 The metallographic structure diagram of the high-strength non-magnetic round steel AM05 drawn wire φ3mm for the armored cable produced by the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0018] Example 1 A method for preparing high-strength non-magnetic round steel for large submarine cable armoring comprises the following steps: S1. Smelting and billet making: using converter + LF furnace + slab continuous casting method to obtain Fe-Mn-Al-C series AM05 non-magnetic steel continuous casting slab with a thickness of 220 mm; S2, slab rolling: the continuous casting slab obtained in step S1 is heated to 1220° C. in a heating furnace and then slab rolled. The slab rolling is controlled to have a thickness of 140 mm, and a slab with an initial rolling thickness of 140 mm is obtained; S3, cutting: Use a clamp to place the slab obtained in step S2 on the cutting machine stand and tighten it, select N points with an equidistant distance of 150 mm on the two end faces of the slab according to the width of the slab after initial rolling, adjust the position of the flame cutting gun, control the slit width to be ≤8 mm, and cut out a square billet with a width of 145 mm. After cutting, remove the burrs after the billet is off the production line; S4, hot rolling: the cut billets are rolled on a high-speed wire production line, put into a heating furnace in batches, heated to 1180°C and then taken out of the furnace, and then rolled into hot-rolled round wire rods with a diameter of φ6.5mm after rough rolling without holes, intermediate rolling with holes, pre-finishing rolling, finishing rolling and sizing reduction mills; S5. Wire drawing: The hot-rolled round wire rod with a diameter of φ6.5 mm is treated with a film and dried, and then single-pass or multi-pass drawing is performed on a wire drawing machine. After annealing, grinding, polishing and galvanizing, AM05 non-magnetic round steel with a diameter of φ3 mm is finally obtained.

[0019] Among them, the AM05 non-magnetic round steel obtained in the step S5 has the following components in weight percentage: C: 0.05%, Si: 0.15%, Mn: 18%, A1: 1.0%, Nb+V+Ti: 0.04%, B+Zn: 0.0020%, P≤0.045%, S≤0.03%, and the rest is Fe and unavoidable impurities.

[0020] Wherein, in step S3, the number of cutting points N of the flame cutting gun is determined according to the width of the slab after initial rolling and the cutting spacing, N=slab width / cutting spacing, wherein N is an integer.

[0021] Among them, in the step S3, the cutting machine uses a flame cutting machine for processing flat steel rectangular billets, the cutting temperature of the ingot is 20°C, the energy medium used for cutting is cutting oxygen, cutting gas, and industrial purified water, the cutting seam is ≤8mm, and the cutting surface roughness is ≤2mm.

[0022] Among them, in step S4, when rolling on the high-speed wire production line, the rolling roll gap, material shape and speed are controlled according to conventional specifications, the wire laying temperature is controlled at 850°C, and the air cooling section adopts the front and middle section fast cooling + rear section air cooling control method.

[0023] Example 2 A method for preparing high-strength non-magnetic round steel for large submarine cable armoring comprises the following steps: S1. Smelting and billet making: using converter + LF furnace + slab continuous casting method to obtain Fe-Mn-Al-C series AM05 non-magnetic steel continuous casting slab with a thickness of 220 mm; S2, slab rolling: the continuous casting slab obtained in step S1 is heated to 1240° C. in a heating furnace and then slab rolled. The slab rolling is controlled to have a thickness of 160 mm, and a slab with an initial rolling thickness of 160 mm is obtained; S3, cutting: Use a clamp to place the slab obtained in step S2 on the cutting machine stand and tighten it, select N points with an equidistant distance of 160 mm on the two end faces of the slab according to the width of the slab after initial rolling, adjust the position of the flame cutting gun, control the slit width to be ≤8 mm, and cut out a square billet with a width of 155 mm. After cutting, remove the burrs after the billet is off the production line; S4, hot rolling: the cut billets are rolled on a high-speed wire production line, put into a heating furnace in batches, heated to 1220°C and then taken out of the furnace, and then rolled into hot-rolled round wire rods with a diameter of φ8mm through a rough rolling unit without holes, a medium rolling unit with holes, a pre-finishing unit, a finishing unit and a sizing unit; S5. Wire drawing: The hot-rolled round wire rod with a diameter of φ8 mm is treated with a film and dried, and then single-pass or multi-pass drawing is performed on a wire drawing machine. After annealing, grinding, polishing and galvanizing, AM05 non-magnetic round steel with a diameter of φ6 mm is finally obtained.

[0024] Among them, the AM05 non-magnetic round steel obtained in the step S5 has the following components in weight percentage: C: 0.20%, Si: 0.30%, Mn: 25%, A1: 2.0%, Nb+V+Ti: 0.08%, B+Zn: 0.0050%, P≤0.045%, S≤0.03%, and the rest is Fe and unavoidable impurities.

[0025] Wherein, in step S3, the number of cutting points N of the flame cutting gun is determined according to the width of the slab after initial rolling and the cutting spacing, N=slab width / cutting spacing, wherein N is an integer.

[0026] Among them, in step S3, the cutting machine uses a flame cutting machine for processing flat steel rectangular billets, the cutting temperature of the ingot is 200°C, the energy medium used for cutting is cutting oxygen, cutting gas, and industrial purified water, the cutting seam is ≤8mm, and the cutting surface roughness is ≤2mm.

[0027] Among them, in step S4, when rolling on the high-speed wire production line, the rolling roll gap, material shape and speed are controlled according to conventional specifications, the wire laying temperature is controlled at 850°C, and the air cooling section adopts the front and middle section fast cooling + rear section air cooling control method.

[0028] Example 3 A method for preparing high-strength non-magnetic round steel for large submarine cable armoring comprises the following steps: S1, smelting and billet making: the blast furnace molten iron after dephosphorization pretreatment is added to the AOD converter, and after adding coke and lime, oxygen is supplied from the top side. After the main decarburization stage, high carbon ferromanganese is added according to 65kg / t steel to realize the primary alloying of manganese element; after the primary alloying of manganese, oxygen is blown first and then the argon oxygen ratio is adjusted to carry out deep decarburization until the final carbon content is controlled at 0.14%; after the decarburization stage, 195Kg / t of electrolytic manganese is added to realize the secondary alloying of manganese element; while the composition is fine-tuned in the reduction stage of the AOD furnace, 20kg / t of aluminum particles are added to perform aluminum alloying, and the steel is tapped after being evenly stirred; the molten steel after AOD smelting is hoisted to the LF furnace for heating desulfurization and fine-tuning the composition, and 1.2kg / t of ferrovanadium is added to perform vanadium alloying; the refined molten iron is hoisted to the continuous casting platform for casting, the tundish temperature is 1445℃, the casting speed is 0.7m / min, and a 220mm continuous casting slab is obtained; S2, slab rolling: the continuous casting slab with a thickness of 220 mm is heated to 1225°C in a heating furnace, and slab rolled to 150×1540×8900 mm; S3, cutting: Use clamps to place the rolled slab on the cutting machine stand and tighten it. According to the width of the slab after initial rolling, select 8 points with an equidistant distance of 160 mm on the two end faces of the slab. Adjust the position of the flame cutting gun to control the slit width to 8 mm. The cut slab is 152 mm wide. After cutting, the slab is deburred after it comes off the production line. S4, hot rolling: the cut billets are rolled on a high-speed wire production line, put into a heating furnace in batches, heated to 1220°C and then taken out of the furnace, and then rolled into hot-rolled round wire rods with a diameter of φ8mm through a rough rolling unit without holes, a medium rolling unit with holes, a pre-finishing unit, a finishing unit and a sizing unit; S5, wire drawing: the hot-rolled round wire rod with a diameter of φ8 mm is treated with a coating and dried, and then single-pass or multi-pass drawing is performed on a wire drawing machine. After annealing, grinding, polishing and galvanizing, a finished product with a diameter of φ6 mm is finally obtained.

[0029] According to the above steps, high-strength non-magnetic round steel AM05 that meets the requirements is obtained. The chemical composition is shown in the following table in terms of weight percentage: .

[0030] The number of cutting points N of the flame cutting gun in step S3 is determined according to the width of the slab after initial rolling and the cutting spacing: N=slab width / cutting spacing (N is an integer). In this example, the slab width is 1280 mm, the cutting spacing is 160 mm, and the number of cutting points = 1280 / 160 = 8.

[0031] The cutting machine in step S3 uses a flame cutting machine for processing flat steel rectangular billets, the cutting billet temperature is 25° C., the energy medium used for cutting is cutting oxygen, the cutting seam is 8 mm, and the cutting surface roughness is ≤ 2 mm.

[0032] In step S4, the rolling roll gap, material type and speed are controlled according to conventional specifications during rolling on the high-speed wire production line, the wire laying temperature is controlled at 850° C., and the air cooling section adopts the front-middle section fast cooling + rear-section air cooling control method.

[0033] After the high-strength non-magnetic round steel AM05 produced by this production method is drawn to 6mm, the mechanical properties are as follows: The average tensile strength Rm is 729.15MPa, and the elongation A / % reaches 39.06%. It has excellent mechanical properties and plays a role in protecting and extending the service life.

[0034] After the non-magnetic round steel AM05 produced by this production method is drawn to 6mm, the magnetic permeability test is shown in the following table: After the non-magnetic round steel AM05 produced by this production method is drawn to 6mm, the resistivity test is shown in the following table: like Figure 1 The figure shows the metallographic structure of the 6mm non-magnetic round steel wire drawing for armored cables produced by the present invention, with an austenite content of ≥99.9%, a grain size of 11.5, and no demagnetization, thereby achieving non-magnetic control.

[0035] After drawing, annealing, grinding, polishing and galvanizing, the chemical corrosion resistance of non-magnetic round steel is improved, and the cost is reasonable, making it suitable for industrial production and large-scale use.

[0036] Example 4 A method for preparing high-strength non-magnetic round steel for large submarine cable armoring comprises the following steps: S1, smelting and billet making: the blast furnace molten iron after dephosphorization pretreatment is added to the AOD converter, and after adding coke and lime, oxygen is supplied by top-side re-blowing. After the main decarburization stage, high carbon ferromanganese is added according to 60kg / t steel to realize the primary alloying of manganese element; after the primary alloying of manganese, oxygen is blown first and then the argon oxygen ratio is adjusted to carry out deep decarburization until the final carbon content is controlled at 0.15%; after the decarburization stage, 200kg / t of electrolytic manganese is added to realize the secondary alloying of manganese element; while the composition is fine-tuned in the reduction stage of the AOD furnace, 18kg / t of aluminum particles are added to perform aluminum alloying, and the steel is tapped after being evenly stirred; the molten steel after AOD smelting is hoisted to the LF furnace for heating desulfurization and fine-tuning the composition, and 1.1kg / t of ferrovanadium is added to perform vanadium alloying; the refined molten iron is hoisted to the continuous casting platform for casting, the tundish temperature is 1440℃, the casting speed is 0.75m / min, and a 220mm continuous casting slab is obtained; S2, slab rolling: the continuous casting slab with a thickness of 220 mm is heated to 1225°C in a heating furnace, and slab rolled to 140×1200×9100 mm; S3, cutting: Use clamps to place the slab with an initial rolling thickness of 140 mm on the cutting machine stand and tighten it. According to the width of the slab after initial rolling, select 8 points with an equidistant distance of 150 mm on the two end faces of the slab, adjust the position of the flame cutting gun, control the slit width to 5 mm, and cut out a square billet with a width of 145 mm. After cutting, remove the burrs after the billet comes off the production line; S4, hot rolling: the cut 140×145mm square billets are rolled on a high-speed wire production line, put into a heating furnace in batches, heated to 1215°C and then taken out of the furnace, and then rolled into hot-rolled round wire rods with a diameter of φ6.5mm through a rough rolling unit without holes, a medium rolling unit with holes, a pre-finishing rolling unit, a finishing rolling unit and a sizing unit; S5, wire drawing: the hot-rolled round wire rod with a diameter of φ6.5 mm is treated with a film and dried, and then single-pass or multi-pass drawing is performed on a wire drawing machine. After annealing, grinding, polishing, and galvanizing, a finished product with a diameter of φ3 mm is finally obtained.

[0037] According to the above steps, the AM05 non-magnetic steel that meets the requirements is obtained. The chemical composition of the non-magnetic round steel AM05 is shown in the following table in terms of weight percentage: The number of cutting points N of the flame cutting gun in step S3 is determined according to the slab width and cutting spacing after initial rolling: N=slab width / cutting spacing (N is an integer). In this example, the slab width is 1200 mm, the cutting spacing is 150 mm, and the number of cutting points = 1280 / 160 = 8.

[0038] The cutting machine in step S3 uses a flame cutting machine for processing flat steel rectangular billets, the cutting temperature of the ingot is 185° C.; the energy medium used for cutting is cutting oxygen; the cutting seam is 5 mm, and the cutting surface roughness is ≤ 2 mm.

[0039] In step S4, the rolling roll gap, material type and speed are controlled according to conventional specifications during rolling on the high-speed wire production line, the wire laying temperature is controlled at 865° C., and the air cooling section adopts the front-middle section fast cooling + rear-section air cooling control method.

[0040] After the non-magnetic round steel AM05 produced by this production method is drawn to 3mm, the mechanical properties are as follows: The average tensile strength Rm is 1529.30MPa, and the elongation A / % reaches 39.84%. It has excellent mechanical properties and plays a role in protecting and extending the service life.

[0041] After the non-magnetic round steel AM05 produced by this production method is drawn to 3mm, the magnetic permeability test is shown in the following table: After the non-magnetic round steel AM05 produced by this production method is drawn to 3mm, the resistivity test is shown in the following table: like Figure 2 The figure shows the metallographic structure of a 3 mm non-magnetic round steel wire for armored cables produced by the present invention, with an austenite content of ≥99.9%, a grain size of 12.5, and no demagnetization, thereby achieving non-magnetic control.

[0042] After drawing, annealing, grinding, polishing and galvanizing, the chemical corrosion resistance of non-magnetic round steel is improved, and the cost is reasonable, making it suitable for industrial production and large-scale use.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing high-strength non-magnetic round steel for large submarine cable armoring, characterized in that: The following steps are involved: S1. Smelting and billet making: using converter + LF furnace + slab continuous casting method to obtain Fe-Mn-Al-C series AM05 non-magnetic steel continuous casting slab with a thickness of 220 mm; S2, slab rolling: the continuous casting slab obtained in step S1 is heated to 1220-1240° C. in a heating furnace and then slab rolled. The slab rolling is controlled to have a thickness of 140-160 mm, and a slab with an initial rolling thickness of 140-160 mm is obtained; S3, cutting: Use a clamp to place the slab obtained in step S2 on the cutting machine stand and tighten it, select N points with an equidistant distance of 150 to 160 mm on the two end faces of the slab according to the width of the slab after initial rolling, adjust the position of the flame cutting gun, control the slit width to be ≤8 mm, and cut out a square billet with a width of 145 to 155 mm. After cutting, remove the burrs after the billet is off the production line; S4, hot rolling: the cut billets are rolled on a high-speed wire production line, put into a heating furnace in batches, heated to 1180-1220°C and then taken out of the furnace, and then rolled into hot-rolled round wire rods with a diameter of φ6.5-φ8mm through a rough rolling unit without holes, a medium rolling unit with holes, a pre-finishing unit, a finishing unit and a sizing unit; S5. Wire drawing: The hot-rolled round wire rod with a diameter of φ6.5 to φ8 mm is treated with a coating and dried, and then single-pass or multi-pass drawing is performed on a wire drawing machine. After annealing, grinding, polishing and galvanizing, AM05 non-magnetic round steel with a diameter of φ3 to φ6 mm is finally obtained.

2. The method for preparing high-strength non-magnetic round steel for large submarine cable armoring according to claim 1, characterized in that: The AM05 non-magnetic round steel obtained in the step S5 has the following components in weight percentage: C: 0.05-0.20%, Si: 0.15-0.30%, Mn: 18-25%, A1: 1.0-2.0%, Nb+V+Ti: 0.04-0.08%, B+Zn: 0.0020-0.0050%, P≤0.045%, S≤0.03%, and the rest is Fe and unavoidable impurities.

3. The method for preparing high-strength non-magnetic round steel for large submarine cable armoring according to claim 1, characterized in that: In step S3, the number of cutting points N of the flame cutting gun is determined according to the width of the slab after initial rolling and the cutting spacing, where N=slab width / cutting spacing, wherein N is an integer.

4. The method for preparing high-strength non-magnetic round steel for large submarine cable armoring according to claim 1, characterized in that: In step S3, the cutting machine uses a flame cutting machine for processing flat steel rectangular billets, the cutting temperature of the ingot is 20-200°C, the energy medium used for cutting is cutting oxygen, cutting gas, industrial purified water, the cutting seam is ≤8mm, and the cutting surface roughness is ≤2mm.

5. The method for preparing high-strength non-magnetic round steel for large submarine cable armoring according to claim 1, characterized in that: In step S4, when rolling on the high-speed wire production line, the rolling roll gap, material type and speed are controlled according to conventional specifications, the wire laying temperature is controlled at 850° C., and the air cooling section adopts the front and middle section fast cooling + rear section air cooling control method.

Images