High-strength galvanized steel wire and production process thereof

Abstract

The application relates to the technical field of metal products, and discloses a high-strength galvanized steel wire and a production process thereof. The high-strength galvanized steel wire is obtained by galvanizing a steel wire, wherein the steel wire is composed of the following components in percentage by mass: C 0.29%-0.34%, Mn 0.43%-0.62%, Co 0.145%-0.155%, Mg 0.15%-0.25%, Cu 0.21%-0.25%, Al 0.18%-0.26%, Y 0.05%-0.08%, S<=0.015%, P<=0.003%, a core strengthening component 0.26%-0.65%, and the rest is iron and inevitable impurities; the core strengthening component includes V, Ta and Nb, and the ratio of (V+Ta) / Nb is 0.3-3. The above technical scheme solves the problem of insufficient strength of the galvanized steel wire in the related art.

Description

Technical Field

[0001] This invention relates to the field of metal products technology, specifically to a high-strength galvanized steel wire and its production process. Background Technology

[0002] Galvanized steel wire is a metallic material made from steel wire through hot-dip galvanizing or cold-dip galvanizing processes. It is widely used in various fields such as construction, transportation, marine engineering, and agriculture and horticulture, including bridge cables, port protection facilities, heavy-duty transport lashing components, and agricultural greenhouse frames. As these applications continue to advance towards larger scale, heavier loads, and higher durability, especially in scenarios with stringent requirements for material load-bearing capacity, such as bridge construction and deep-sea operations, the market has placed increasingly stringent standards on the strength performance of galvanized steel wire. Insufficient strength in galvanized steel wire can easily lead to breakage, deformation, and other safety hazards, potentially causing major safety accidents, huge economic losses, and a waste of valuable resources. However, current galvanized steel wire production processes still have significant limitations, resulting in products with generally low strength, making them unsuitable for the practical application needs of high-end fields. Therefore, it is necessary to propose a high-strength galvanized steel wire and its production process. Summary of the Invention

[0003] This invention proposes a high-strength galvanized steel wire and its production process, which solves the problem of insufficient strength of galvanized steel wire in related technologies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention proposes a high-strength galvanized steel wire, obtained by fluxing and hot-dip galvanizing steel wire. The steel wire, by mass percentage, comprises the following components: C 0.29%~0.34%, Mn 0.43%~0.62%, Co 0.145%~0.155%, Mg 0.15%~0.25%, Cu 0.21%~0.25%, Al 0.18%~0.26%, Y 0.05%~0.08%, S≤0.015%, P≤0.003%, core reinforcing component 0.26%~0.65%, with the remainder being iron and unavoidable impurities. The core reinforcing component includes V, Ta, and Nb, and the ratio of V, Ta, and Nb is (V+Ta) / Nb = 0.3~3.

[0006] As a further technical solution, the ratio of Ta / V in the core reinforcing component is 2 to 11.

[0007] This invention relates to high-strength galvanized steel wire, which controls the ratio of V to Ta in the core reinforcing component of the wire within a reasonable range of 2 to 11. This fully leverages the synergistic effect of the two elements: V, as the main element for carbide formation, can efficiently combine with C in the steel to generate fine and dispersed carbides, thereby improving the strength of the steel wire; the appropriate addition of Ta can reduce the formation of coarse carbides. This ratio design effectively avoids the degradation of material properties caused by excessive amounts of a single element, further enhancing the mechanical properties of the galvanized steel wire.

[0008] This invention also proposes a production process for high-strength galvanized steel wire, comprising the following steps:

[0009] S1. Prepare and melt the steel wire according to its composition to obtain molten steel;

[0010] S2. The molten steel is poured, cooled and shaped to obtain a steel billet;

[0011] S3. The steel billet is hot-rolled into wire rod, then drawn to obtain drawn steel wire, and then the drawn steel wire is heat-treated to obtain steel wire.

[0012] S4. After pickling and washing, the steel wire is placed in a fluxing agent for fluxing treatment to obtain fluxed steel wire.

[0013] S5. The coated steel wire is placed in a zinc bath for hot-dip galvanizing treatment to obtain galvanized steel wire.

[0014] As a further technical solution, in step S3, the heat treatment includes the following steps:

[0015] A1. Annealing treatment: After heating the drawn steel wire to 700~750℃ and holding it for 1~2 hours, first cool it down to 550~600℃ at the first cooling rate, then cool it down to 290~310℃ at the second cooling rate, and then air cool it to room temperature to obtain annealed drawn steel wire; the first cooling rate is less than the second cooling rate.

[0016] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 220~250℃, held for 1~1.5h, and then air-cooled to room temperature.

[0017] As a further technical solution, in step A1, the first cooling rate is 50~80℃ / h, and the second cooling rate is 100~120℃ / h.

[0018] The heat treatment of high-strength galvanized steel wire in this invention can significantly improve the mechanical strength of the steel wire: In the annealing stage, the temperature is first lowered to 550-600℃ at a relatively slow rate of 50-80℃ / h. This process ensures that a uniform and stable basic structural morphology is formed inside the material, avoiding incomplete internal structural development due to excessively rapid cooling. Subsequently, the temperature is lowered to 290-310℃ at a relatively rapid rate of 100-120℃ / h, which not only promotes further densification of the internal structure of the material, but also avoids internal stress concentration problems that may be caused by excessively high cooling rates. Subsequent air cooling can gradually release the residual stress accumulated in the early stage and reduce structural hazards. After tempering treatment at 220-250℃ for 1-1.5h, the high-quality structure formed after annealing can be further stabilized, reducing unstable factors inside the structure, thereby achieving a significant improvement in the strength of the steel wire.

[0019] As a further technical solution, in step S4, the plating flux comprises the following components in parts by weight: 30-40 parts zinc chloride, 10-12 parts ammonium chloride, 5-7 parts sodium fluoride, 0.4-0.6 parts emulsifier, and 90 parts water.

[0020] As a further technical solution, the emulsifier includes one or more of fatty alcohol polyoxyethylene ether, sodium dodecylbenzene sulfonate, and octylphenol polyoxyethylene ether.

[0021] As a further technical solution, in step S5, the zinc liquid is composed of the following components by mass percentage: Fe 0.03%~0.05%, Mg 0.08%~0.12%, Si 0.1%~0.2%, Al 0.02%~0.05%, with the balance being Zn and unavoidable impurities.

[0022] As a further technical solution, in step S4, the pickling process uses a hydrochloric acid aqueous solution with a mass fraction of 15% to 25%.

[0023] As a further technical solution, in step S4, the plating process takes 4 to 6 minutes.

[0024] The working principle and beneficial effects of this invention are as follows:

[0025] This invention, through precise control of the content ratio of V, Ta, and Nb in steel wire, fully leverages the synergistic strengthening effects of each element: V and Ta can form fine, dispersed carbides with C in the steel, effectively hindering dislocation movement and enhancing the strength and hardness of the steel wire; Nb refines the grain structure of the steel, improving the toughness and strength-toughness balance of the steel wire, while inhibiting grain growth at high temperatures, ensuring the stability of material properties during subsequent hot-dip galvanizing processes. Controlling the (V+Ta) / Nb ratio within a reasonable range of 0.3 to 3 achieves an optimal balance between carbide strengthening and grain refinement strengthening. This avoids the impact of excessive V and Ta on toughness due to coarse carbide aggregation, while also preventing an excessively high Nb proportion from weakening the carbide strengthening effect, ultimately significantly improving the overall strength of the galvanized steel wire. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] In the following examples and comparative examples: fatty alcohol polyoxyethylene ether, model AEO-9, was purchased from Shandong Jinli Chemical Co., Ltd.; octylphenol polyoxyethylene ether, model OP-10, was purchased from Jiangsu Maoheng Chemical Co., Ltd.

[0028] Example 1

[0029] A high-strength galvanized steel wire is obtained by fluxing and hot-dip galvanizing steel wire;

[0030] The steel wire, by mass percentage, consists of the following components: C 0.29%, Mn 0.43%, Co 0.145%, Mg 0.15%, Cu 0.21%, Al 0.18%, Y 0.05%, S 0.01%, P 0.001%, core reinforcing component 0.26%, with the remainder being iron and unavoidable impurities; the core reinforcing component consists of Ta 0.02%, V 0.04%, and Nb 0.2%, with a ratio of (V+Ta) / Nb of 0.3 and a V / Ta ratio of 2;

[0031] A production process for high-strength galvanized steel wire includes the following steps:

[0032] S1. According to the composition of steel wire, the materials are mixed and smelted to obtain molten steel;

[0033] S2. The molten steel is poured, cooled, and shaped to obtain a steel billet;

[0034] S3. The steel billet is hot-rolled into wire rod, then drawn to obtain drawn steel wire, and then the drawn steel wire is heat-treated to obtain steel wire.

[0035] S4. After pickling and washing the steel wire with a 20% hydrochloric acid aqueous solution, place it in a fluxing agent for 5 minutes to obtain a fluxed steel wire. The fluxing agent includes the following components in parts by weight: 30 parts zinc chloride, 10 parts ammonium chloride, 5 parts sodium fluoride, 0.4 parts fatty alcohol polyoxyethylene ether, and 90 parts water.

[0036] S5. After hot-dip galvanizing, the coated steel wire is placed in the zinc bath to obtain galvanized steel wire. The zinc bath, by mass percentage, consists of the following components: Fe 0.03%, Mg 0.08%, Si 0.1%, Al 0.02%, with the balance being Zn and unavoidable impurities.

[0037] The heat treatment includes the following steps:

[0038] A1. Annealing treatment: After heating the drawn steel wire to 720℃ and holding it at that temperature for 1.5h, first cool it down to 580℃ at a rate of 50℃ / h, then cool it down to 300℃ at a rate of 100℃ / h, and then air cool it to room temperature to obtain the annealed drawn steel wire.

[0039] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 230℃, held at that temperature for 1.5 hours, and then air-cooled to room temperature.

[0040] Example 2

[0041] A high-strength galvanized steel wire is obtained by fluxing and hot-dip galvanizing steel wire;

[0042] The steel wire, by mass percentage, consists of the following components: C 0.31%, Mn 0.52%, Co 0.15%, Mg 0.2%, Cu 0.23%, Al 0.22%, Y 0.06%, S 0.012%, P 0.002%, core reinforcing component 0.52%, with the remainder being iron and unavoidable impurities; the core reinforcing component consists of Ta 0.04%, V 0.08%, and Nb 0.4%, with a ratio of (V+Ta) / Nb of 0.3 and a V / Ta ratio of 2;

[0043] A production process for high-strength galvanized steel wire includes the following steps:

[0044] S1. According to the composition of steel wire, the materials are mixed and smelted to obtain molten steel;

[0045] S2. The molten steel is poured, cooled, and shaped to obtain a steel billet;

[0046] S3. The steel billet is hot-rolled into wire rod, then drawn to obtain drawn steel wire, and then the drawn steel wire is heat-treated to obtain steel wire.

[0047] S4. After pickling and washing the steel wire with a 20% hydrochloric acid aqueous solution, place it in a fluxing agent for 5 minutes to obtain a fluxed steel wire. The fluxing agent includes the following components in parts by weight: 35 parts zinc chloride, 11 parts ammonium chloride, 6 parts sodium fluoride, 0.5 parts sodium dodecylbenzenesulfonate, and 90 parts water.

[0048] S5. After hot-dip galvanizing, the coated steel wire is placed in the zinc bath to obtain galvanized steel wire. The zinc bath, by mass percentage, consists of the following components: Fe 0.04%, Mg 0.1%, Si 0.15%, Al 0.04%, with the balance being Zn and unavoidable impurities.

[0049] The heat treatment includes the following steps:

[0050] A1. Annealing treatment: After heating the drawn steel wire to 720℃ and holding it at that temperature for 1.5h, first cool it down to 580℃ at a rate of 50℃ / h, then cool it down to 300℃ at a rate of 100℃ / h, and then air cool it to room temperature to obtain the annealed drawn steel wire.

[0051] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 230℃, held at that temperature for 1.5 hours, and then air-cooled to room temperature.

[0052] Example 3

[0053] A high-strength galvanized steel wire is obtained by fluxing and hot-dip galvanizing steel wire;

[0054] The steel wire, by mass percentage, consists of the following components: C 0.34%, Mn 0.62%, Co 0.155%, Mg 0.25%, Cu 0.25%, Al 0.26%, Y 0.08%, S 0.015%, P 0.003%, core reinforcing component 0.65%, with the remainder being iron and unavoidable impurities; the core reinforcing component consists of Ta 0.05%, V 0.1%, and Nb 0.5%, with a ratio of (V+Ta) / Nb of 0.3 and a V / Ta ratio of 2;

[0055] A production process for high-strength galvanized steel wire includes the following steps:

[0056] S1. According to the composition of steel wire, the materials are mixed and smelted to obtain molten steel;

[0057] S2. The molten steel is poured, cooled, and shaped to obtain a steel billet;

[0058] S3. The steel billet is hot-rolled into wire rod, then drawn to obtain drawn steel wire, and then the drawn steel wire is heat-treated to obtain steel wire.

[0059] S4. After pickling and washing the steel wire with a 20% hydrochloric acid aqueous solution, place it in a fluxing agent for 5 minutes to obtain a fluxed steel wire. The fluxing agent includes the following components in parts by weight: 40 parts zinc chloride, 12 parts ammonium chloride, 7 parts sodium fluoride, 0.6 parts octylphenol polyoxyethylene ether, and 90 parts water.

[0060] S5. After hot-dip galvanizing, the coated steel wire is placed in the zinc bath to obtain galvanized steel wire. The zinc bath, by mass percentage, consists of the following components: Fe 0.05%, Mg 0.12%, Si 0.2%, Al 0.05%, with the balance being Zn and unavoidable impurities.

[0061] The heat treatment includes the following steps:

[0062] A1. Annealing treatment: After heating the drawn steel wire to 720℃ and holding it at that temperature for 1.5h, first cool it down to 580℃ at a rate of 50℃ / h, then cool it down to 300℃ at a rate of 100℃ / h, and then air cool it to room temperature to obtain the annealed drawn steel wire.

[0063] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 230℃, held at that temperature for 1.5 hours, and then air-cooled to room temperature.

[0064] Example 4

[0065] Compared with Example 2, the only difference in Example 4 is that the core reinforcing component of the steel wire in this example consists of 0.104% Ta, 0.208% V, and 0.208% Nb, with a ratio of (V+Ta) / Nb of 1.5 and a ratio of V / Ta of 2.

[0066] Example 5

[0067] Compared with Example 2, the only difference in Example 5 is that the core reinforcing component of the steel wire in this example consists of 0.13% Ta, 0.26% V, and 0.13% Nb, with a ratio of (V+Ta) / Nb of 3 and a V / Ta of 2.

[0068] Example 6

[0069] Compared with Example 2, the only difference in Example 6 is that the core reinforcing component of the steel wire in this example consists of 0.052% Ta, 0.26% V, and 0.208% Nb, with a ratio of (V+Ta) / Nb of 1.5 and a V / Ta of 5.

[0070] Example 7

[0071] Compared with Example 2, the only difference in Example 7 is that the core reinforcing component of the steel wire in this example consists of 0.026% Ta, 0.286% V, and 0.208% Nb, with a ratio of (V+Ta) / Nb of 1.5 and a V / Ta of 11.

[0072] Example 8

[0073] Compared with Example 2, the only difference in Example 8 is that the heat treatment in this example includes the following steps:

[0074] A1. Annealing treatment: After heating the drawn steel wire to 720℃ and holding it at that temperature for 1.5h, first cool it down to 580℃ at a rate of 50℃ / h, then cool it down to 300℃ at a rate of 110℃ / h, and then air cool it to room temperature to obtain the annealed drawn steel wire.

[0075] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 230℃, held at that temperature for 1.5 hours, and then air-cooled to room temperature.

[0076] Example 9

[0077] Compared with Example 2, the only difference in Example 9 is that the heat treatment in this example includes the following steps:

[0078] A1. Annealing treatment: After heating the drawn steel wire to 720℃ and holding it at that temperature for 1.5h, first cool it down to 580℃ at a rate of 50℃ / h, then cool it down to 300℃ at a rate of 120℃ / h, and then air cool it to room temperature to obtain the annealed drawn steel wire.

[0079] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 230℃, held at that temperature for 1.5 hours, and then air-cooled to room temperature.

[0080] Example 10

[0081] Compared with Example 2, the only difference in Example 10 is that the heat treatment in this example includes the following steps:

[0082] A1. Annealing treatment: After heating the drawn steel wire to 720℃ and holding it at that temperature for 1.5h, first cool it down to 580℃ at a rate of 65℃ / h, then cool it down to 300℃ at a rate of 110℃ / h, and then air cool it to room temperature to obtain the annealed drawn steel wire.

[0083] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 230℃, held at that temperature for 1.5 hours, and then air-cooled to room temperature.

[0084] Example 11

[0085] Compared with Example 2, the only difference in Example 11 is that the heat treatment in this example includes the following steps:

[0086] A1. Annealing treatment: After heating the drawn steel wire to 720℃ and holding it at that temperature for 1.5h, first cool it down to 580℃ at 80℃ / h, then cool it down to 300℃ at 110℃ / h, and then air cool it to room temperature to obtain the annealed drawn steel wire.

[0087] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 230℃, held at that temperature for 1.5 hours, and then air-cooled to room temperature.

[0088] Example 12

[0089] Compared with Example 2, the only difference in Example 12 is that the heat treatment in this example includes the following steps:

[0090] A1. Annealing treatment: The drawn steel wire is heated to 720℃ and held for 1.5h, then cooled to 300℃ at 90℃ / h, and then air-cooled to room temperature to obtain the annealed drawn steel wire.

[0091] A2. Tempering treatment: After annealing, the drawn steel wire is heated to 230℃, held at that temperature for 1.5 hours, and then air-cooled to room temperature.

[0092] Comparative Example 1

[0093] Compared with Example 2, the only difference in Comparative Example 1 is that, in this comparative example, the core reinforcing component of the steel wire is composed of Nb and V in a mass ratio of 5:1.

[0094] Comparative Example 2

[0095] Compared with Example 2, the only difference in Comparative Example 2 is that, in this comparative example, the core reinforcing component of the steel wire is composed of Nb and Ta in a mass ratio of 10:1.

[0096] Comparative Example 3

[0097] Compared with Example 2, the only difference in Comparative Example 3 is that, in this comparative example, the core reinforcing component of the steel wire is composed of V and Ta in a mass ratio of 2:1.

[0098] Comparative Example 4

[0099] Compared with Example 2, the only difference in Comparative Example 4 is that the core reinforcing component of the steel wire in this comparative example is only Nb.

[0100] Comparative Example 5

[0101] Compared with Example 2, the only difference in Comparative Example 5 is that the core reinforcing component of the steel wire in this comparative example is only V.

[0102] Comparative Example 6

[0103] Compared with Example 2, the only difference in Comparative Example 6 is that the core reinforcing component of the steel wire in this comparative example is Ta.

[0104] Comparative Example 7

[0105] Compared with Example 2, the only difference in Comparative Example 7 is that the steel wire in this comparative example does not contain a core reinforcing component.

[0106] The steel wires prepared in Examples 1-12 and Comparative Examples 1-7 were tested according to the following method:

[0107] 1. Tensile strength test: The tensile strength of the steel wire was tested according to the test method in GB / T 228.1-2021 "Metallic materials, tensile testing - Part 1: Test at room temperature". The test rate was 0.008s. -1 ;

[0108] The test results are shown in Tables 1 and 2:

[0109] Table 1. Test results of tensile strength of steel wire

[0110]

[0111] As shown in Table 1, the comparison between Examples 1-7 and Comparative Examples 1-7 indicates that the addition of the core reinforcing components composed of V, Ta, and Nb can further improve the tensile strength of the steel wire.

[0112] Table 2. Tensile strength test results of steel wire

[0113]

[0114] As shown in Table 2, the comparison of Examples 2, 8-12 indicates that during the annealing process of heat treatment of steel wire, heating the drawn steel wire to 700-750℃ and holding it for 1-2 hours, then cooling it to 550-600℃ at a cooling rate of 50-80℃ / h, then cooling it to 290-310℃ at a cooling rate of 100-120℃ / h, and finally air-cooling it to room temperature can further improve the tensile strength of the steel wire.

[0115] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength galvanized steel wire, characterized in that, The steel wire is obtained by fluxing and hot-dip galvanizing. The steel wire, by mass percentage, comprises the following components: C 0.29%~0.34%, Mn 0.43%~0.62%, Co 0.145%~0.155%, Mg 0.15%~0.25%, Cu 0.21%~0.25%, Al 0.18%~0.26%, Y 0.05%~0.08%, S≤0.015%, P≤0.003%, core reinforcing component 0.26%~0.65%, with the remainder being iron and unavoidable impurities. The core reinforcing component is V, Ta, and Nb, and the ratio of V, Ta, and Nb is (V+Ta) / Nb = 0.3~3. The production process of the high-strength galvanized steel wire includes the following steps: S1. Prepare and melt the steel wire according to its composition to obtain molten steel; S2. The molten steel is poured, cooled and shaped to obtain a steel billet; S3. The steel billet is hot-rolled into wire rod, then drawn to obtain drawn steel wire, and then the drawn steel wire is heat-treated to obtain steel wire. S4. After pickling and washing, the steel wire is placed in a fluxing agent for fluxing treatment to obtain fluxed steel wire. S5. The coated steel wire is placed in a zinc bath for hot-dip galvanizing treatment to obtain galvanized steel wire. The heat treatment includes the following steps: A1. Annealing treatment: After heating the drawn steel wire to 700~750℃ and holding it for 1~2 hours, first cool it down to 550~600℃ at the first cooling rate, then cool it down to 290~310℃ at the second cooling rate, and then air cool it to room temperature to obtain annealed drawn steel wire; the first cooling rate is less than the second cooling rate. A2. Tempering treatment: Heat the annealed steel wire to 220~250℃, hold for 1~1.5h, and then air cool to room temperature; The flux comprises the following components in parts by weight: 30-40 parts zinc chloride, 10-12 parts ammonium chloride, 5-7 parts sodium fluoride, 0.4-0.6 parts emulsifier, and 90 parts water.

2. The high-strength galvanized steel wire according to claim 1, characterized in that, The ratio of Ta to V in the core reinforcing component is 2 to 11.

3. The high-strength galvanized steel wire according to claim 1, characterized in that, In step A1, the first cooling rate is 50~80℃ / h, and the second cooling rate is 100~120℃ / h.

4. The high-strength galvanized steel wire according to claim 1, characterized in that, The emulsifier includes one or more of fatty alcohol polyoxyethylene ether, sodium dodecylbenzene sulfonate, and octylphenol polyoxyethylene ether.

5. A high-strength galvanized steel wire according to claim 1, characterized in that, In step S5, the zinc liquid is composed of the following components by mass percentage: Fe 0.03%~0.05%, Mg 0.08%~0.12%, Si 0.1%~0.2%, Al 0.02%~0.05%, with the balance being Zn and unavoidable impurities.

6. The high-strength galvanized steel wire according to claim 1, characterized in that, In step S4, the acid washing process uses a hydrochloric acid aqueous solution with a mass fraction of 15% to 25%.

7. The high-strength galvanized steel wire according to claim 1, characterized in that, In step S4, the plating process takes 4 to 6 minutes.

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