Steel wire with surface attached oxide layer

Abstract

The application has a steel wire with a surface attached oxide layer, and the steps are as follows: preparing a drawing die and introducing the steel wire; after the steel wire is drawn into shape, passing through a heat treatment pipeline; slow preheating: heating from room temperature to 300 DEG C within 5 min, so that the temperature of the steel wire is uniform inside and outside, avoiding partial overheating; slow heating: heating to 400 DEG C within 3 min, and the whole steel wire is heated; fast heating: heating to 510 DEG C within 1 min, and quickly entering an oxide layer forming temperature point; uniformly heating to 530 DEG C, and uniformly forming a high adhesion Fe3O4 surface layer on the surface layer of the steel wire.

Description

Technical Field

[0001] This invention relates to the field of metal materials technology, and in particular to steel wire products, specifically a steel wire with an oxide layer attached to its surface. Background Technology

[0002] When coiling springs at high speeds using a coiling machine, the requirements for oil-quenched steel wire become even more stringent, especially the thickness, adhesion, and coverage of the oxide layer on the wire surface. Therefore, controlling the thickness and coverage of the oxide layer on the wire surface to meet the requirements of high-speed coiling is a major challenge currently faced by all oil-tempered spring steel wire manufacturers.

[0003] Therefore, it is necessary to provide a steel wire with a surface oxide layer to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a steel wire with an oxide layer attached to its surface.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A steel wire with an oxide layer attached to its surface, the steps are as follows:

[0007] 1) Prepare the drawing die and introduce the steel wire;

[0008] 2) After the steel wire is drawn and formed, it passes through a heat treatment pipeline;

[0009] 2-1) Slow preheating: Heat from room temperature to 300°C within 5 minutes to ensure uniform temperature inside and outside the steel wire and avoid partial overheating;

[0010] 2-2) Slow heating: Heat to 400°C within 3 minutes to raise the temperature of the entire steel wire;

[0011] 2-3) Rapid heating: Heat to 510°C within 1 minute to quickly reach the temperature point for oxide layer formation;

[0012] 2-4) The temperature is raised to 530°C at a uniform rate, and a highly adhesive Fe3O4 surface layer is formed uniformly on the surface of the steel wire.

[0013] 3) Roll up.

[0014] Furthermore, in steps 2-4), there are different heat treatment settings for steel wires of different diameters.

[0015] Furthermore, in steps 2-4), the steel wire diameter is less than 2.642 mm, and it is heated at a uniform rate from 510°C to 530°C within 15-20 minutes.

[0016] Furthermore, in steps 2-4), the steel wire diameter is 2.642 mm or larger, and it is heated at a uniform rate from 510°C to 530°C within 30-35 minutes.

[0017] Furthermore, the heat treatment pipe is filled with steam from a ferrous hydroxide aqueous solution.

[0018] Furthermore, the heat treatment pipes are also filled with pure oxygen.

[0019] Furthermore, the ratio of steam to pure oxygen is 1:3 to 1:2.

[0020] Compared with the prior art, the present invention can uniformly form a highly adhesive oxide layer on the surface of steel wire, which is beneficial to the production requirements of high-speed coil springs. Detailed Implementation

[0021] Example:

[0022] A steel wire with an oxide layer attached to its surface, the steps are as follows:

[0023] 1) Prepare the drawing die and introduce the steel wire;

[0024] 2) After the steel wire is drawn and formed, it passes through a heat treatment pipeline;

[0025] 2-1) Slow preheating: Heat from room temperature to 300°C within 5 minutes to ensure uniform temperature inside and outside the steel wire and avoid partial overheating;

[0026] 2-2) Slow heating: Heat to 400°C within 3 minutes to raise the temperature of the entire steel wire;

[0027] 2-3) Rapid heating: Heat to 510°C within 1 minute to quickly reach the temperature point for oxide layer formation;

[0028] 2-4) The temperature is raised to 530°C at a uniform rate, and a highly adhesive Fe3O4 surface layer is formed uniformly on the surface of the steel wire.

[0029] 3) Roll up.

[0030] in:

[0031] In steps 2-4), there are different heat treatment settings for steel wires of different diameters.

[0032] In steps 2-4), the steel wire diameter is less than 2.642 mm, and it is heated at a uniform rate from 510°C to 530°C within 15-20 minutes.

[0033] In steps 2-4), the steel wire diameter is 2.642 mm or larger, and it is heated at a uniform rate from 510°C to 530°C within 30-35 minutes.

[0034] The heat treatment pipeline is filled with steam from an aqueous solution of ferrous hydroxide.

[0035] The heat treatment pipes are also filled with pure oxygen.

[0036] The ratio of steam to pure oxygen is 1:3 to 1:2.

[0037] Compared with the prior art, the present invention can uniformly form a highly adhesive oxide layer on the surface of steel wire, which is beneficial to the production requirements of high-speed coil springs.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A steel wire with a surface oxide layer, characterized in that: The steps are as follows: 1) Prepare the drawing die and introduce the steel wire; 2) After the steel wire is drawn and formed, it passes through a heat treatment pipe, which is filled with steam from a ferrous hydroxide aqueous solution and pure oxygen. 2-1) Slow preheating: Heat from room temperature to 300°C within 5 minutes to ensure uniform temperature inside and outside the steel wire and avoid partial overheating; 2-2) Slow heating: Heat to 400°C within 3 minutes to raise the temperature of the entire steel wire; 2-3) Rapid heating: Heat to 510°C within 1 minute to quickly reach the temperature point for oxide layer formation; 2-4) The temperature is raised to 530°C at a uniform rate, and a highly adhesive Fe3O4 surface layer is uniformly formed on the surface of the steel wire; 3) Roll up.

2. The steel wire with a surface oxide layer according to claim 1, characterized in that: In steps 2-4), there are different heat treatment settings for steel wires of different diameters.

3. A steel wire with a surface oxide layer according to claim 2, characterized in that: In steps 2-4), the steel wire diameter is less than 2.642 mm, and it is heated at a uniform rate from 510°C to 530°C within 15-20 minutes.

4. A steel wire with a surface oxide layer according to claim 2, characterized in that: In steps 2-4), the steel wire diameter is 2.642 mm or larger, and it is heated at a uniform rate from 510°C to 530°C within 30-35 minutes.

5. A steel wire with a surface oxide layer according to claim 4, characterized in that: The ratio of steam to pure oxygen is 1:3 to 1:2.