Hot galvanizing process for steel wire rope for ocean ship

Abstract

The invention discloses a hot galvanizing process for a steel wire rope for a marine ship. The hot galvanizing process comprises the following steps of degreasing, heat treatment, water bath, water cooling, acid pickling, water washing, plating assisting, drying, hot galvanizing, water cooling, soap soaking and take-up. According to the invention, the temperature of each process is explored, and particularly, the heating furnace is subjected to partitioned temperature control, so that the steel wire can be accurately heated, and preparation is made for subsequent hot galvanizing. Flexible adjustment is achieved according to different diameters, the influence of the diameter span is small, and the influence of production change on the product quality is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel wire rope production, and more particularly to a hot galvanizing process for steel wire rope for marine vessels. BACKGROUND

[0002] Galvanized steel wire is wire that has been coated with a layer of zinc after drawing, such as large-drawing and medium-drawing. There are two ways of galvanizing, one is hot galvanizing, and the other is electro-galvanizing. The two galvanizing methods have their own advantages and disadvantages. Steel wire rope for marine vessels often chooses the hot galvanizing method due to higher requirements for corrosion resistance. The existing hot galvanizing process has a small range of adaptation to the diameter of steel wire, generally 0.88-1.8 mm. If the diameter of steel wire exceeds 1.8 mm, the galvanizing process needs to be adjusted to achieve better galvanizing effect. The steel wire rope production process line is generally long, and once the process is adjusted, multiple threading, testing and correction are required, which seriously affects the production efficiency of the steel wire rope. SUMMARY

[0003] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present application provide a hot galvanizing process for steel wire rope for marine vessels to solve the problems raised in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a hot galvanizing process for steel wire rope for marine vessels, comprising the following steps: degreasing, heat treatment, water bath, water cooling, pickling, water washing, plating aid, drying, hot galvanizing, water cooling, soap immersion and take-up; The temperature of the degreasing solution is 80-100 DEG C, the temperature of the heat treatment is 950-990 DEG C, the temperature of the water bath is 85-95 DEG C, the temperature of the water cooling solution is ≤80 DEG C, the temperature of the pickling solution is 50-70 DEG C, the temperature of the water washing is normal temperature, the temperature of the plating aid is 50-70 DEG C, the temperature of the drying is 60-80 DEG C, the temperature of the hot galvanizing is 440-460 DEG C, the temperature of the water cooling solution is ≤80 DEG C, and the temperature of the soap immersion is 65-85 DEG C.

[0005] As the preferred technical scheme of the above step: the heat treatment comprises five-zone temperature treatment, specifically: zone one 950-970 DEG C, zone two 960-980 DEG C, zone three 970-990 DEG C, zone four 960-980 DEG C, and zone five 950-970 DEG C.

[0006] As the preferred technical scheme of the above step: the pickling comprises pre-pickling and main pickling. The pre-pickling solution is hydrochloric acid with a concentration of 90-150 g / l, and the main pickling solution is hydrochloric acid with a concentration of 120-180 g / l.

[0007] As the preferred technical scheme of the above step: the water washing is in a flowing water flushing mode, and at least 3 or more flushing is required. The pH value of the water washing is 5-6.

[0008] As the preferred technical solution of the above step: the length of the steel wire in the water bath is 60-310 cm.

[0009] As the preferred technical solution of the above step: the speed of the take-up is 29-114 m / min.

[0010] Technical effects and advantages of the present application: 1. The present application can accurately heat the steel wire by exploring the temperature of each process, especially by controlling the temperature of the heating furnace in different zones, thereby preparing for the subsequent hot galvanizing.

[0011] 2. The present application can be flexibly adjusted for different diameters, and is less affected by the diameter span. The impact of production change on product quality is also greatly reduced.

[0012] 3. The present application can simultaneously perform hot treatment and galvanizing in the same zone for different steel grades, and the mechanical and physical properties of the product are more superior. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The figure is a structural schematic diagram of the hot galvanizing process of the steel wire rope for marine ships. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only 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 of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0015] Embodiment 1:

[0016] Please refer to Figure 1As shown, the present application provides: a marine ship steel wire rope hot galvanizing process, comprising the following steps: degreasing, heat treatment, water bath, water cooling, pickling, water washing, plating aid, drying, hot galvanizing, water cooling, soap dipping and take-up; wherein the solution temperature of degreasing is 80℃, the heat treatment includes five-zone temperature treatment, specifically: zone one 950℃, zone two 960℃, zone three 970℃, zone four 960℃, zone five 950℃, the temperature of water bath is 80℃, the solution temperature of water cooling is 10℃, pickling includes pre-pickling and main pickling, the solution of pre-pickling is hydrochloric acid with a concentration of 90g / l, the solution of main pickling is hydrochloric acid with a concentration of 120g / l, the solution temperature of pickling is 50℃, water washing is a flowing water flushing mode, which needs more than 3 flushing, wherein the pH value of water washing is 5, the temperature of water washing is normal temperature, the temperature of plating aid is 50℃, the temperature of drying is 30℃, the temperature of hot galvanizing is 440℃, the solution temperature of water cooling is 20℃, the temperature of soap dipping is 75℃.

[0017] Example 2:

[0018] Please refer to Figure 1 As shown, the present application provides: a marine ship steel wire rope hot galvanizing process, comprising the following steps: degreasing, heat treatment, water bath, water cooling, pickling, water washing, plating aid, drying, hot galvanizing, water cooling, soap dipping and take-up; wherein the solution temperature of degreasing is 80℃, the heat treatment includes five-zone temperature treatment, specifically: zone one 950℃, zone two 960℃, zone three 970℃, zone four 960℃, zone five 950℃, the temperature of water bath is 80℃, the solution temperature of water cooling is 10℃, pickling includes pre-pickling and main pickling, the solution of pre-pickling is hydrochloric acid with a concentration of 90g / l, the solution of main pickling is hydrochloric acid with a concentration of 120g / l, the solution temperature of pickling is 50℃, water washing is a flowing water flushing mode, which needs more than 3 flushing, wherein the pH value of water washing is 5, the temperature of water washing is normal temperature, the temperature of plating aid is 50℃, the temperature of drying is 30℃, the temperature of hot galvanizing is 440℃, the solution temperature of water cooling is 20℃, the temperature of soap dipping is 75℃.

[0019] Example 3:

[0020] Please refer to Figure 1As shown, the present application provides: a marine ship steel wire rope hot galvanizing process, comprising the following steps: degreasing, heat treatment, water bath, water cooling, pickling, water washing, plating, drying, hot galvanizing, water cooling, soap dipping and take-up; wherein the solution temperature of degreasing is 90°C, the heat treatment includes five-zone temperature treatment, specifically: zone one 960°C, zone two 970°C, zone three 980°C, zone four 970°C, zone five 960°C, the temperature of water bath is 90°C, the solution temperature of water cooling is 40°C, pickling includes pre-pickling and main pickling, the solution of pre-pickling is hydrochloric acid with a concentration of 120g / l, the solution of main pickling is hydrochloric acid with a concentration of 150g / l, the solution temperature of pickling is 60°C, water washing is a flowing water flushing method, which needs more than 4 flushing, wherein the pH value of water washing is 5.5, the temperature of water washing is normal temperature, the temperature of plating is 60°C, the temperature of drying is 50°C, the temperature of hot galvanizing is 450°C, the solution temperature of water cooling is 50°C, and the temperature of soap dipping is 87°C.

[0021] As the preferred technical solution of the above step: the length of the steel wire in the water bath is 60-310cm, and the speed of take-up is 29-114m / min. As shown in Table 1 below:

[0022] As can be seen from the DV value in Table 1 above, the galvanizing process of the present application has better effect, the enterprise can not only improve the production capacity, but also stabilize the quality, and solve the problem of large diameter span and difficult production quality control.

[0023] Comparative Example 1: as shown in Table 2:

[0024] As can be seen from the above comparative example, when the heat treatment does not perform five-zone heating, the DV value decreases by 20-28%, and it is not difficult to see the effect of the present application zone heating, which is a relatively significant effect in the field.

[0025] Comparative Example 2: as shown in Table 3:

[0026] As can be seen from the above comparative example, when the take-up speed control is not good, the DV value decreases by 11-16%, and it is not difficult to see the important effect of the take-up speed of the present application.

[0027] Finally: the above-mentioned is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A process for hot galvanizing a steel wire rope for marine vessels, characterized in that, It comprises the following steps: degreasing, heat treatment, water bath, water cooling, pickling, water washing, plating aid, drying, hot galvanizing, water cooling, soap dipping and wire collecting; The solution temperature of degreasing is 80-100℃, the temperature of heat treatment is 950-990℃, the temperature of water bath is 80-100℃, the solution temperature of water cooling is ≤80℃, the solution temperature of pickling is 50-70℃, the temperature of water washing is normal temperature, the temperature of plating aid is 50-70℃, the temperature of drying is 30-70℃, the temperature of hot galvanizing is 440-460℃, the solution temperature of water cooling is ≤80℃, and the temperature of soap dipping is 75-100℃.

2. A process for hot galvanizing steel wire ropes for marine vessels as claimed in claim 1, wherein: The heat treatment comprises five-zone temperature treatment, specifically, the first zone is 950-970℃, the second zone is 960-980℃, the third zone is 970-990℃, the fourth zone is 960-980℃, and the fifth zone is 950-970℃.

3. A process for hot galvanizing of steel wire ropes for marine vessels as claimed in claim 1, wherein: The pickling comprises pre-pickling and main pickling, the solution of pre-pickling is hydrochloric acid with a concentration of 90-150g / l, and the solution of main pickling is hydrochloric acid with a concentration of 120-180g / l.

4. A process for hot galvanizing of steel wire ropes for marine vessels as claimed in claim 1, wherein: The water washing is in the form of flowing water washing, and at least 3 or more washing is needed, wherein the pH value of water washing is 5-6.

5. A process for hot galvanizing steel wire ropes for marine vessels as claimed in claim 1, wherein: The water quenching length of steel wire in water bath is 60-310cm.

6. A process for hot galvanizing steel wire ropes for marine vessels as claimed in claim 1, wherein: The speed of wire collecting is 29-114m / min.

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