阅读说明：本技术 一种超高碳超细钢丝水浴热处理工艺 (Water-bath heat treatment process for ultra-high carbon superfine steel wire ) 是由 吴晓玲 程冠博 殷闽 程俊杰 乐金荣 黄陈 于 2021-09-07 设计创作，主要内容包括：本发明涉及到一种超高碳超细钢丝水浴热处理工艺,包括如下具体步骤：a、直径0.3-0.6mm、含碳量0.9～1.1%的钢丝经清洗后以50～70m/min的线速度进入奥氏体化炉,炉内温度控制在850～930℃,加热时间为15-25s,出炉温度控制在800～900℃；b、钢丝出炉后立即进入86～95℃的水浴槽水冷,冷却时长小于0.5s,钢丝出水温度控制在500～600℃；c、钢丝出水后立即进入控温装置进行保温,控温装置内部温度控制在400～550℃,钢丝在控温装置内的运行距离为3～15m；d、钢丝出控温装置后空冷至室温并进行收卷。通过该工艺能够有效控制超高碳超细钢丝在热处理过程中的温度变化,有效控制其金相转化过程,从而获得性能符合湿拉要求的钢丝。(The invention relates to a water bath heat treatment process of ultra-high carbon ultra-fine steel wires, which comprises the following specific steps: a. cleaning a steel wire with the diameter of 0.3-0.6mm and the carbon content of 0.9-1.1%, and then feeding the steel wire into an austenitizing furnace at the linear speed of 50-70 m/min, controlling the temperature in the furnace to be 850-930 ℃, the heating time to be 15-25s, and controlling the tapping temperature to be 800-900 ℃; b. the steel wire is immediately cooled in a 86-95 ℃ water bath after being discharged from the furnace, the cooling time is less than 0.5s, and the water outlet temperature of the steel wire is controlled at 500-600 ℃; c. immediately allowing the steel wire to enter a temperature control device for heat preservation after water is discharged, controlling the internal temperature of the temperature control device to be 400-550 ℃, and controlling the running distance of the steel wire in the temperature control device to be 3-15 m; d. and after the steel wire is discharged from the temperature control device, air cooling to room temperature and rolling. The process can effectively control the temperature change of the ultra-high carbon ultra-fine steel wire in the heat treatment process and effectively control the metallographic conversion process, thereby obtaining the steel wire with the performance meeting the wet drawing requirement.)

1. A water bath heat treatment process for ultra-high carbon ultra-fine steel wires is characterized by comprising the following specific steps:

a. cleaning a steel wire with the diameter of 0.3-0.6mm and the carbon content of 0.9-1.1%, and then feeding the steel wire into an austenitizing furnace at the linear speed of 50-70 m/min, controlling the temperature in the furnace to be 850-930 ℃, the heating time to be 15-25s, and controlling the tapping temperature to be 800-900 ℃;

b. the steel wire is immediately cooled in a 86-95 ℃ water bath after being discharged from the furnace, the cooling time is less than 0.5s, and the water outlet temperature of the steel wire is controlled at 500-600 ℃;

c. immediately allowing the steel wire to enter a temperature control device for heat preservation after water is discharged, controlling the internal temperature of the temperature control device to be 400-550 ℃, and controlling the running distance of the steel wire in the temperature control device to be 3-15 m;

d. and after the steel wire is discharged from the temperature control device, air cooling to room temperature and rolling.

2. The water bath heat treatment process for ultra-high carbon ultra-fine steel wire as claimed in claim 1, wherein the water bath solution in the water bath is sodium polyacrylate solution or polyvinyl alcohol solution with concentration of 9-11 g/L.

3. The water bath heat treatment process for ultra-high carbon ultra-fine steel wire as recited in claim 1, wherein the cooling time of the steel wire entering the water bath is 0.03 s-0.42 s.

4. The ultra-high carbon ultra-fine steel wire water bath heat treatment process as claimed in claim 1, wherein the water bath (1) comprises a closed box body (101), the front end of the box body (101) is provided with a wire inlet (102), the rear end of the box body (101) is provided with a wire outlet (103), two partition plates (104) arranged in front and back are arranged in the box body (101), the upper end of any partition plate (104) is higher than the steel wire (100), the upper edge of the partition plate (104) is provided with grooves (105) which are one-to-one corresponding to the steel wire (100) and can be used for the steel wire (100) to pass through in a hanging way, the two partition plates (104) divide the inner space of the box body (101) into three front overflow chutes (106), cooling chutes (107) and rear overflow chutes (108) which are arranged in sequence in front and back, the bottom surface of the cooling chute (107) is provided with a water inlet (109), and the water inlet (110) is connected with the water inlet (109), the bottom surfaces of the front overflow groove (106) and the rear overflow groove (108) are provided with water outlets (111), the water outlets (111) are connected with water discharge pipes (112), the front end of the box body (101) is connected to the outlet side of the austenitizing furnace (3) through a ceramic plate (2), a wire inlet (102) at the front end of the box body (101) is in butt joint with an outlet (301) of the austenitizing furnace (3), and the ceramic plate (2) is provided with a through hole (201) connected with the wire inlet (102) and the outlet (301) of the austenitizing furnace (3).

5. The ultra-high carbon ultra-fine steel wire water bath heat treatment process as claimed in claim 4, wherein a spray header (113) opposite to the cooling tank (107) is arranged at the top end of the box body (101), the spray header (113) is connected with the water inlet pipe (110) through a branch pipe (114), and a valve (115) is arranged on the branch pipe (114).

Technical Field

The invention relates to a water bath heat treatment process of ultra-high carbon ultra-fine steel wires.

Background

The wet drawing of steel wire is a cold drawing process, under the action of drawing force, the thick steel wire is extruded by die to become thin steel wire, the reduction rate of sectional area before wet drawing and that after wet drawing is called face shrinkage rate, and after the wet drawn steel wire is heat treated before wet drawing, the metallographic phase of the steel wire is converted into fine sorbite, so that the face shrinkage of the steel wire can be effectively improved.

However, as the cutting process is continuously improved, the diameter of the cut steel wire is required to be thinner, which means that the surface shrinkage of the steel wire is higher and higher, and the cut steel wire is required to have extremely high strength, so that the steel wire for cutting is required to have extremely high carbon content, and the thinner the steel wire is, the more difficult the heat treatment process is to be controlled, and the metallographic structure of the steel wire is difficult to achieve the ideal target.

At present, when steel wires with the carbon content of 0.9-1.1% and the diameter of 0.3-0.6mm are processed, as the steel wires are thin, a super-cooled structure is easy to generate in the cooling process after heat treatment, a uniform and fine metallographic structure cannot be ensured, the subsequent wet wire breakage rate cannot be ensured, and the uniform surface shrinkage rate meeting the requirements cannot be achieved.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the process can effectively control the temperature change of the ultra-high carbon ultra-fine steel wire in the heat treatment process and effectively control the metallographic conversion process, thereby obtaining the steel wire with the performance meeting the wet drawing requirement.

In order to solve the technical problems, the invention adopts the technical scheme that: a water bath heat treatment process for ultra-high carbon ultra-fine steel wires comprises the following specific steps:

a. cleaning a steel wire with the diameter of 0.3-0.6mm and the carbon content of 0.9-1.1%, and then feeding the steel wire into an austenitizing furnace at the linear speed of 50-70 m/min, controlling the temperature in the furnace to be 850-930 ℃, the heating time to be 15-25s, and controlling the tapping temperature to be 800-900 ℃;

b. the steel wire is immediately cooled in a 86-95 ℃ water bath after being discharged from the furnace, the cooling time is less than 0.5s, and the water outlet temperature of the steel wire is controlled at 500-600 ℃;

c. immediately allowing the steel wire to enter a temperature control device for heat preservation after water is discharged, controlling the internal temperature of the temperature control device to be 400-550 ℃, and controlling the running distance of the steel wire in the temperature control device to be 3-15 m;

d. and after the steel wire is discharged from the temperature control device, air cooling to room temperature and rolling.

Preferably, the water bath solution in the water bath is a sodium polyacrylate solution or a polyvinyl alcohol solution with the concentration of 9-11 g/L.

As a preferable scheme, the cooling time of the steel wire entering the water bath for water cooling is 0.03 s-0.42 s.

As a preferable scheme, the water bath comprises a closed box body, the front end of the box body is provided with a wire inlet, the rear end of the box body is provided with a wire outlet, two partition plates which are arranged in the box body in a front-back mode are arranged in the box body, the upper end of any partition plate is higher than the height of a steel wire, the upper edge of each partition plate is provided with a groove which is in one-to-one correspondence with the steel wire and can be used for the steel wire to pass in a hanging mode, the two partition plates divide the inner space of the box body into three front overflow chutes and cooling chutes which are arranged in sequence from front to back, the rear overflow groove is provided with a water inlet on the bottom surface of the cooling groove, the water inlet is connected with a water inlet pipe, water outlets are formed in the bottom surfaces of the front overflow groove and the rear overflow groove and are connected with a water discharge pipe, the front end of the box body is connected to the outlet side of the austenitizing furnace through a ceramic plate, a wire inlet at the front end of the box body is in butt joint with the outlet of the austenitizing furnace, and a through hole for connecting the wire inlet with the outlet of the austenitizing furnace is formed in the ceramic plate.

As a preferred scheme, the top end of the box body is provided with a spray header opposite to the cooling tank, the spray header is connected with a water inlet pipe through a branch pipe, and the branch pipe is provided with a valve.

The invention has the beneficial effects that: the invention makes the steel wire temperature always keep in the sorbite transition temperature interval in the temperature return stage after water cooling through the design of the process parameters of the steel wire heating process, the water cooling process and the radiation heat insulation process, so that the steel wire metallographic phase is slowly and fully sorbitized, the sorbite grain size is less than 14 mu m, the lamella spacing is less than 0.1 mu m, and the strength and the surface shrinkage of the steel wire are greatly improved.

Drawings

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a schematic view of a connection structure of a water bath and an austenitizing furnace;

in fig. 1: 1. the device comprises a water bath tank, 101, a box body, 102, a wire inlet, 103, a wire outlet, 104, a partition plate, 105, a groove, 106, a front overflow groove, 107, a cooling groove, 108, a rear overflow groove, 109, a water inlet, 110, a water inlet pipe, 111, a water outlet, 112, a water outlet pipe, 113, a spray head, 114, a branch pipe, 115, a valve, 2, a ceramic plate, 201, a through hole, 3, an austenitizing furnace, 301, an outlet, 100 and steel wires.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

A water bath heat treatment process for ultra-high carbon ultra-fine steel wires comprises the following specific steps:

a. cleaning a steel wire with the diameter of 0.3-0.6mm and the carbon content of 0.9-1.1%, and then feeding the steel wire into an austenitizing furnace at the linear speed of 50-70 m/min, controlling the temperature in the furnace to be 850-930 ℃, the heating time to be 15-25s, and controlling the tapping temperature to be 800-900 ℃;

b. the steel wire is immediately cooled in a 86-95 ℃ water bath after being discharged from the furnace, the cooling time is less than 0.5s, and the water outlet temperature of the steel wire is controlled at 500-600 ℃;

c. immediately allowing the steel wire to enter a temperature control device for heat preservation after water is discharged, controlling the internal temperature of the temperature control device to be 400-550 ℃, and controlling the running distance of the steel wire in the temperature control device to be 3-15 m;

d. and after the steel wire is discharged from the temperature control device, air cooling to room temperature and rolling.

In the embodiment, the water bath solution in the water bath is a sodium polyacrylate solution or a polyvinyl alcohol solution with the concentration of 9-11g/L, the surface tension of the solution is large, a large number of bubbles are formed on the surface of the steel wire immediately after the high-temperature steel wire enters the water bath, and the bubbles surround and cover the surface of the steel wire, so that the steel wire is cooled in the sealed and surrounded bubbles. The cooling time of the steel wire entering the water bath for water cooling is 0.03 s-0.42 s.

As shown in fig. 1, the water bath 1 includes a closed box 101, the front end of the box 101 is provided with a wire inlet 102, the rear end of the box 101 is provided with a wire outlet 103, two partition plates 104 arranged in front and back are arranged in the box 101, the upper end of any partition plate 104 is higher than the height of the steel wire 100, the upper edge of the partition plate 104 is provided with a groove 105 corresponding to the steel wire 100 and allowing the steel wire 100 to pass through in a suspended manner, the two partition plates 104 divide the internal space of the box 101 into three front overflow chutes 106, cooling chutes 107 and rear overflow chutes 108 arranged in front and back in sequence, the bottom surface of the cooling chute 107 is provided with a water inlet 109, the water inlet 109 is connected with a water inlet pipe 110, the bottom surfaces of the front overflow chutes 106 and the rear overflow chutes 108 are provided with water outlets 111, the water outlets 111 are connected with a water outlet 112, the front end of the box 101 is connected to the outlet side of the austenitizing furnace 3 through a ceramic plate 2, the wire inlet 102 at the front end of the box 101 is in butt joint with the outlet 301 of the austenitizing furnace 3, the ceramic plate 2 is provided with a through hole 201 connecting the wire inlet 102 and the outlet 301 of the austenitizing furnace 3. The top end of the box body 101 is provided with a spray header 113 opposite to the cooling groove 107, the spray header 113 is connected with the water inlet pipe 110 through a branch pipe 114, and the branch pipe 114 is provided with a valve 115.

The water bath 1 continuously supplies 86-95 ℃ cooling water through a water inlet pipe 110, after the cooling water is filled in a cooling groove 107, the cooling water overflows outwards from a groove 105 on the upper edge of a partition plate 104 and flows into a front overflow groove 106 and a rear overflow groove 108 respectively, and then is discharged from a water outlet 111 through a water outlet pipe 112, the steel wire 100 directly enters the water bath 1 from the austenitizing furnace 3, and the middle of the steel wire is not influenced by other space temperatures, so that the control on the temperature of the steel wire 100 can be effectively improved, and the temperature conversion process of the steel wire is ensured to be consistent with the process design.

The shower head 113 can effectively control the ambient temperature in the box body 101, and the influence of the steel wire 100 on the ambient temperature in the box body 101 is avoided. The cooling effect of the water bath 1 on the steel wire 100 is always kept consistent.

After the steel wire with the diameter of 0.3-0.6mm and the carbon content of 0.9-1.1% is subjected to heat treatment by adopting the process, the strength of the steel wire reaches 1500-1600MPa, the surface shrinkage reaches 45 +/-3%, the 100d gauge length is twisted for more than 35 times, the bending time is more than 35 times, the sorbite grain size is less than 14 mu m, and the lamella spacing is less than 0.1 mu m.

The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.