Production method of ER70S-6 welding steel wire rod easy to mechanically descale

Abstract

The invention discloses a method for producing an ER70S-6 welding steel wire rod easy to mechanically descale, which comprises the following steps of: a) heating a steel billet: heating the steel billet by adopting a double-regenerative heating furnace, and regulating and controlling the generation of scale on the surface of the steel billet by accurately controlling the temperature and the heating time of each section; b) descaling with high-pressure water: after the steel billet is heated, removing primary oxide scale by using a high-pressure water descaling device; c) rolling the wire rod: controlling the temperature in the wire rod rolling process to ensure that the thickness of the generated oxide scale is moderate; and d) controlled cooling: after the rolling of the wire rod is completed, separating cracks are generated between the scale on the surface of the wire rod and the matrix by accurately controlling the cooling condition. According to the method, the production efficiency of the steel wire rod for ER70S-6 welding is improved, the quality defect caused by oxide scale residues in subsequent drawing production is greatly reduced, meanwhile, the environmental protection problem caused by a traditional acid pickling process is avoided, and meanwhile, the cost is effectively controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of steel production and processing, and specifically relates to a method for producing an ER70S-6 welding steel wire rod which is easy to mechanically descale. Background Art

[0002] ER70S-6 welding steel wire rod, as a high-quality steel designed for carbon dioxide gas shielded solid welding wire, has an indispensable position in the welding operations of key facilities and equipment in many fields such as shipbuilding, bridge construction, petrochemical pipeline laying, and engineering machinery manufacturing due to its excellent welding performance. This steel not only has excellent mechanical properties and crack resistance, but also can show stable arc characteristics and good weld formation during the welding process, thus ensuring the high strength and durability of the welded structure.

[0003] In the traditional production process of ER70S-6 welding steel wire rod, the drawing process is the key link in making welding wire. However, in this process, the iron oxide scale formed on the surface of the wire rod has always been an important factor affecting product quality and production efficiency. In order to remove this layer of iron oxide scale, the traditional practice is to carry out pickling treatment before wire drawing. Although pickling can effectively remove iron oxide scale, it also brings environmental problems, such as the discharge and treatment of acid liquid, as well as high treatment costs.

[0004] In recent years, with the increasingly stringent environmental protection requirements and the urgent need to control production costs, many wire drawing plants have begun to seek more environmentally friendly and economical solutions. In this context, it has become a trend to cancel the original pickling process and use mechanical descaling technology to remove the iron oxide on the surface of the wire rod. Mechanical descaling not only avoids the use and discharge of acid, reduces environmental pollution, but also can reduce production costs and improve production efficiency to a certain extent.

[0005] However, the iron scale on the surface of the wire rod produced by the original wire rod production method is often relatively strong and not easy to peel off mechanically. As a result, during the drawing process, the iron scale remaining on the surface of the wire rod is prone to cause quality defects such as fracture and surface scratches, which seriously affects the quality of the welding wire and the effect of subsequent welding operations. Therefore, developing a new method for producing ER70S-6 welding steel wire rod that is easy to mechanically descale is of great significance for improving the quality of welding wire, reducing production costs, and meeting environmental protection requirements. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a.

[0007] The present invention is achieved by a method for producing ER70S-6 welding steel wire rod that is easy to mechanically descale, characterized in that the method mainly comprises the following steps:

[0008] a) Billet heating: The billet is heated by a double regenerative heating furnace, and the formation of iron oxide scale on the billet surface is regulated by accurately controlling the temperature and heating time of each section;

[0009] b) High-pressure water descaling: After the billet is heated, the primary iron oxide scale is removed using a high-pressure water descaling device;

[0010] c) Wire rolling: by controlling the temperature during the wire rolling process, ensure that the thickness of the oxide scale is moderate;

[0011] d) Controlled cooling: After the wire is rolled, the cooling conditions are precisely controlled to create separation cracks between the iron oxide scale on the wire rod surface and the matrix.

[0012] Further preferably, in the billet heating stage, a double regenerative heating furnace is used, and the specific control parameters are as follows: the temperature of the preheating section is lower than 850°C, the temperature of the first heating section is controlled at 850-1000°C, the temperature of the second heating section is controlled at 990-1160°C, the temperature of the equalizing section is controlled at 1000-1150°C, and the heating time is controlled at 2.5-3.5 hours.

[0013] Further preferably, after the billet is heated, a high-pressure water descaling operation is performed, wherein the pressure of the high-pressure water descaling is not less than 18 MPa to ensure effective removal of the primary iron oxide scale on the billet surface.

[0014] Further preferably, in the wire rolling process, the rolling temperature is specifically controlled as follows: the starting rolling temperature is controlled at 1020-1040°C, the finishing rolling temperature is controlled at 900-920°C, and the wire laying temperature is controlled at 920-940°C to ensure that the thickness of the oxide scale is moderate.

[0015] Further preferably, after the wire rod is rolled, the separation between the iron oxide scale on the wire rod surface and the matrix is ​​achieved by controlling the cooling conditions. The specific control parameters are: the temperature entering the heat preservation hood is controlled at 910-930°C, the temperature exiting the heat preservation hood is controlled at no more than 600°C, the roller speed is controlled at 0.20-0.30m / s, and the time in the heat preservation hood is not less than 330 seconds.

[0016] The advantages and technical effects of the present invention are as follows: It solves the problem that the iron oxide scale on the surface of the wire rod is difficult to mechanically peel off in the traditional process. The generation of the iron oxide scale is effectively regulated by using a double heat storage heating furnace to accurately control the heating temperature and time of the steel billet. Subsequently, the iron oxide scale is efficiently removed once using a high-pressure water descaling device, which lays a good foundation for the subsequent rolling and cooling processes. In the wire rolling process, the thickness of the iron oxide scale is ensured to be moderate through fine temperature control, which not only protects the substrate but also facilitates subsequent processing. Finally, by precisely controlling the cooling conditions, separation cracks are cleverly generated between the iron oxide scale on the surface of the wire rod and the substrate, which significantly improves the mechanical stripping rate of the iron oxide scale.

[0017] In summary, the present invention not only improves the production efficiency of ER70S-6 welding steel wire rod, but also significantly reduces the quality defects caused by residual iron oxide scale in subsequent drawing production, while avoiding the environmental problems caused by the traditional pickling process. This innovative method not only meets environmental protection requirements, but also achieves effective cost control, making an important contribution to the technological progress and sustainable development of the welding industry. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] A method for producing ER70S-6 welding steel wire rod that is easy to mechanically descale, characterized in that the method mainly comprises the following steps:

[0020] a) Billet heating: The billet is heated by a double regenerative heating furnace, and the formation of iron oxide scale on the billet surface is regulated by precisely controlling the temperature and heating time of each section; compared with the traditional heating method, the temperature and heating time of each section can be controlled more accurately. This precise control helps to reduce the formation of iron oxide scale on the billet surface, thereby creating more favorable conditions for subsequent processes. At the same time, the double regenerative heating furnace is also energy-saving and efficient, which helps to reduce production costs;

[0021] b) High-pressure water descaling: After the billet is heated, the high-pressure water descaling device is used to remove the primary iron oxide scale; compared with the traditional pickling descaling method, high-pressure water descaling not only avoids the use and discharge of acid, reduces environmental pollution, but also has a more significant descaling effect and can more effectively remove the iron oxide scale on the billet surface. In addition, high-pressure water descaling also has the advantages of simple operation and low cost.

[0022] c) Wire rolling: By controlling the temperature during the wire rolling process, the thickness of the oxide scale is ensured to be moderate; compared with the traditional rolling method, this precise temperature control helps to reduce the amount of oxide scale generated, while ensuring that the rolled wire has better surface quality and mechanical properties. In addition, the moderate oxide scale thickness also helps the mechanical peeling of the oxide scale in the subsequent process.

[0023] d) Controlled cooling: After the wire is rolled, the cooling conditions are precisely controlled to produce separation cracks between the iron oxide scale on the wire rod surface and the matrix. Compared with traditional cooling methods, this innovative cooling method can more effectively promote the separation between the iron oxide scale and the matrix, thereby significantly improving the mechanical stripping rate of the iron oxide scale. This not only helps to reduce quality defects caused by residual iron oxide scale in subsequent drawing production, but also improves production efficiency and reduces production costs. At the same time, precise cooling control also helps to optimize the structure and performance of the wire, improve its service life and welding quality.

[0024] Further preferably, in the billet heating link, a double regenerative heating furnace is used, and the specific control parameters are as follows: the temperature of the preheating section is lower than 850°C. This temperature range helps the billet to gradually heat up and reduce the thermal stress caused by rapid heating. At the same time, it preliminarily prepares the billet surface and lays the foundation for the subsequent heating stage; the temperature of the first heating section is controlled at 850-1000°C. At this stage, the heating process of the billet begins to accelerate, but the temperature is still maintained at a relatively low level to avoid the premature formation of too thick iron oxide scale; the temperature of the second heating section is controlled at 990-1160°C. At this stage, the billet temperature is further increased to promote The internal structure is homogenized and the generation rate of iron oxide scale is controlled at the same time; the temperature of the soaking section is controlled at 1000-1150℃. This stage ensures that the overall temperature of the billet is uniform, providing a stable temperature basis for the subsequent rolling process; the heating time is controlled at 2.5-3.5 hours; through reasonable heating time, it not only ensures that the billet is fully heated, but also avoids excessive oxidation caused by too long heating time; based on the above parameter settings, the billet heating process can achieve precise temperature control and time management, effectively regulate the generation of iron oxide scale on the billet surface, and provide high-quality raw materials for subsequent processes.

[0025] Further preferably, after the billet is heated, a high-pressure water descaling operation is performed, wherein the pressure of the high-pressure water descaling is not less than 18 MPa, so as to ensure effective removal of the primary iron oxide scale on the billet surface and provide a clean billet surface for subsequent rolling processes.

[0026] Further preferably, in the wire rolling process, the rolling temperature is specifically controlled as follows: the start rolling temperature is controlled at 1020-1040°C, and this temperature range helps the steel billet to smoothly enter the rolling state and reduce the deformation resistance in the initial rolling stage; the finishing rolling temperature is controlled at 900-920°C, and the temperature at this stage is moderate, which not only ensures the smooth progress of rolling, but also controls the generation of iron oxide scale; the wire drawing temperature is controlled at 920-940°C, and this temperature range helps the wire to maintain stable structure and performance after wire drawing; to ensure that the thickness of the iron oxide scale is moderate; by precisely controlling the rolling temperature, the wire rolling process can ensure that the thickness of the iron oxide scale is moderate, which not only protects the wire matrix, but also facilitates the mechanical peeling of the iron oxide scale in subsequent processes.

[0027] Further preferably, after the wire rod is rolled, the separation between the iron scale on the surface of the wire rod and the matrix is ​​achieved by controlling the cooling conditions. The specific control parameters are: the temperature entering the insulation cover is controlled at 910-930°C, and this temperature range helps the wire rod to cool evenly in the insulation cover; the temperature exiting the insulation cover is controlled at no more than 600°C, and by controlling the cooling rate and time, the wire rod is ensured to reach the ideal temperature state when it exits the insulation cover; the roller speed is controlled at 0.20-0.30m / s, and the appropriate roller speed helps the wire rod to cool evenly in the insulation cover; the time in the insulation cover is not less than 330 seconds, and sufficient insulation time can ensure that the wire rod is fully cooled and promotes the separation between the iron scale and the matrix. By precisely controlling the cooling conditions and controlling the cooling process, the effective separation between the iron scale on the surface of the wire rod and the matrix can be achieved, the mechanical stripping rate of the iron scale can be significantly improved, and the quality defects caused by the residual iron scale in the subsequent drawing production can be reduced. At the same time, reasonable cooling parameters also help to optimize the organization and performance of the wire rod, improve its service life and welding quality.

[0028] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for producing ER70S-6 welding steel wire rod that is easy to mechanically descale, characterized in that: The method mainly includes the following steps: a) Billet heating: The billet is heated by a double regenerative heating furnace, and the formation of iron oxide scale on the billet surface is regulated by accurately controlling the temperature and heating time of each section; b) High-pressure water descaling: After the billet is heated, the primary iron oxide scale is removed using a high-pressure water descaling device; c) Wire rolling: by controlling the temperature during the wire rolling process, ensure that the thickness of the oxide scale is moderate; d) Controlled cooling: After the wire is rolled, the cooling conditions are precisely controlled to create separation cracks between the iron oxide scale on the wire rod surface and the matrix.

2. The production method according to claim 1, characterized in that: In the billet heating process, a double regenerative heating furnace is used, and the specific control parameters are as follows: the temperature of the preheating section is lower than 850°C, the temperature of the first heating section is controlled at 850-1000°C, the temperature of the second heating section is controlled at 990-1160°C, the temperature of the soaking section is controlled at 1000-1150°C, and the heating time is controlled at 2.5-3.5 hours.

3. The production method according to claim 1 or 2, characterized in that: After the billet is heated, a high-pressure water descaling operation is carried out, wherein the pressure of the high-pressure water descaling is not less than 18 MPa to ensure effective removal of the primary iron oxide scale on the surface of the billet.

4. The production method according to any one of claims 1 to 3, characterized in that: In the wire rolling process, the rolling temperatures are specifically controlled as follows: the starting rolling temperature is controlled at 1020-1040°C, the finishing rolling temperature is controlled at 900-920°C, and the wire drawing temperature is controlled at 920-940°C to ensure that the thickness of the oxide scale is moderate.

5. The production method according to any one of claims 1 to 4, characterized in that: After the wire rod is rolled, the separation between the oxide scale on the wire rod surface and the matrix is ​​achieved by controlling the cooling conditions; the specific control parameters are: the temperature entering the insulation cover is controlled at 910-930°C, the temperature exiting the insulation cover is controlled at no more than 600°C, the roller speed is controlled at 0.20-0.30m / s, and the time in the insulation cover is not less than 330 seconds.