阅读说明：本技术 一种线棒材控温及抑制表面红锈的工艺方法 (process method for controlling temperature of wire rod and inhibiting surface red rust ) 是由 白亚斌 周民 马靳江 牛强 于 2019-08-26 设计创作，主要内容包括：本发明属于钢铁冶金工业技术领域,涉及一种线棒材控温及抑制表面红锈的工艺方法,其步骤是：1)线棒材经终轧后,此时轧件速度＞4m/s,轧件表面温度≤1050℃；2)轧件依次通过若干个输出装置进行传输后,通过设置在输出装置之间环状的高速压缩空气流,压缩空气流压力强度≥0.2Mpa；3)轧件到达冷床或吐丝机处时,轧件表面温度≤1000℃,轧件表面干燥无残留水。本方法可控制终轧后轧件的冷却速度和温度,可进一步细化晶粒提高轧件强度,避免由于水冷造成的过度冷却产生有害马氏体组织,还可隔离轧件表面对水的吸附,限制线棒材在高/中温阶段期间与水的反应,抑制红褐色的羟基氧化铁和三氧化二铁生成,改善表面质量和外观。(The invention belongs to the technical field of ferrous metallurgy industry, and relates to a process method for controlling temperature of a wire rod and inhibiting red rust on the surface, which comprises the following steps: 1) after the wire rod is subjected to final rolling, the speed of a rolled piece is more than 4m/s, and the surface temperature of the rolled piece is less than or equal to 1050 ℃; 2) after the rolled piece is transmitted by a plurality of output devices in sequence, the pressure intensity of the compressed air flow is more than or equal to 0.2Mpa through annular high-speed compressed air flow arranged between the output devices; 3) when the rolled piece reaches a cooling bed or a laying head, the surface temperature of the rolled piece is less than or equal to 1000 ℃, and the surface of the rolled piece is dry and has no residual water. The method can control the cooling speed and temperature of the rolled piece after final rolling, can further refine crystal grains to improve the strength of the rolled piece, avoid the generation of a harmful martensite structure due to excessive cooling caused by water cooling, can also isolate the water adsorption of the surface of the rolled piece, limit the reaction of the wire rod and the water during the high/medium temperature stage, inhibit the generation of red-brown iron oxyhydroxide and ferric oxide, and improve the surface quality and appearance.)

1. A process method for controlling the temperature of a wire rod and inhibiting the red rust on the surface of the wire rod is characterized by comprising the following steps:

A. The wire rod is rolled by the finishing mill group and then enters an output device, the rolling speed of a rolled piece is more than 4m/s, and the surface temperature of the rolled piece is less than or equal to 1050 ℃;

B. The rolled piece is sequentially transmitted through the output devices, and is subjected to multi-stage temperature control cooling through annular high-speed compressed air flow arranged between the output devices, the annular high-speed compressed air flow plays a role in isolating the surface of the rolled piece from cooling water, and the pressure intensity of compressed air in the annular high-speed compressed air flow is more than or equal to 0.2 Mpa;

C. when the rolled piece reaches a cooling bed or a laying head, the surface temperature of the rolled piece is less than or equal to 1000 ℃, and the surface of the rolled piece is dry and has no residual water.

2. A process for controlling temperature of wire and rod materials and inhibiting surface red rust according to claim 1, wherein an annular high-speed compressed air ring is arranged in each output device channel, and 1-6 rolled pieces can be accommodated in each output device channel simultaneously.

3. The process for controlling temperature of wire and rod material and inhibiting surface red rust according to claim 1, wherein the output device is a plurality of output roller tables or output guide grooves.

4. The process for controlling temperature of wire and rod material and inhibiting surface red rust according to claim 1, wherein the number of the output devices is 1-6.

Technical Field

The invention belongs to the technical field of ferrous metallurgy industry, and relates to a process method for controlling temperature of a wire rod and inhibiting red rust on the surface of the wire rod.

Background

With the economic development and the vigorous development of the steel industry, a large amount of resources and energy sources are consumed for steel production, and the influence on the environment is huge. How to further reduce the production energy consumption, how to further improve the steel performance and how to further improve the production stability is a continuously pursued target in the steel industry. The temperature control of the rolled piece of the wire rod material after final rolling and the temperature control after the final rolling are an important direction, and two important production processes exist at present.

1) The forced water penetration process comprises the following steps: the wire and bar rolled piece is subjected to finish rolling at a high temperature (about 1000 ℃), the rolled piece is subjected to forced water cooling continuously in a short time after finish rolling, the surface temperature of the rolled piece can be below 400 ℃, the final product is low-cost high-strength construction steel, the surface structure is tempered martensite, and the core structure is pearlite. The process has the disadvantages that a large amount of red rust is generated on the surface of the product in a short time after the product is produced, the surface quality and the appearance are greatly influenced, and the sale is influenced.

2) and (3) weak water penetration process: the wire and bar rolled piece is finally rolled at a lower temperature (about 900 ℃), and the temperature of the rolled piece is continuously reduced by multi-stage weak water cooling such as water cooling, recovery, water cooling, recovery and the like after final rolling. The surface temperature needs to be controlled to be more than 400 ℃, the final product is low-cost high-strength fine-grain building steel, and the product structure is pearlite and ferrite. The process has the disadvantages that the temperature is difficult to control accurately, the temperature is low to control, and harmful tissues are easy to generate due to careless control; the temperature control is high, micro-alloy elements are required to be added to the components of the rolled piece, and the production cost is increased. In addition, red rust is generated on the surface of the water-cooled product rolled at a lower temperature, so that the surface quality and the appearance are greatly influenced, and the sale is influenced.

Disclosure of Invention

In view of the above, the present invention provides a process method for controlling temperature of wire and rod material and inhibiting surface red rust, in order to solve the problem that a large amount of red rust appears on the surface of the wire and rod material after cold rolling through the two water penetration processes, which affects the sales.

In order to achieve the purpose, the invention provides a process method for controlling the temperature of a wire rod and inhibiting the red rust on the surface of the wire rod, which comprises the following steps:

A. The wire rod is rolled by the finishing mill group and then enters an output device, the rolling speed of a rolled piece is more than 4m/s, and the surface temperature of the rolled piece is less than or equal to 1050 ℃;

B. The rolled piece is sequentially transmitted through the output devices, and is subjected to multi-stage temperature control cooling through annular high-speed compressed air flow arranged between the output devices, the annular high-speed compressed air flow plays a role in isolating the surface of the rolled piece from cooling water, and the pressure intensity of compressed air in the annular high-speed compressed air flow is more than or equal to 0.2 Mpa;

C. When the rolled piece reaches a cooling bed or a laying head, the surface temperature of the rolled piece is less than or equal to 1000 ℃, and the surface of the rolled piece is dry and has no residual water.

Furthermore, an annular high-speed compressed air ring is arranged in a channel of each output device, and 1-6 rolled pieces can be accommodated in each output device channel simultaneously.

Furthermore, the output device is a plurality of output roller beds or output guide grooves.

Furthermore, the number of the output devices is 1-6.

the invention has the beneficial effects that:

The process method for controlling the temperature of the wire rod and inhibiting the surface red rust disclosed by the invention has the effects of refining grains and improving the strength of a rolled piece by controlling the cooling speed and the temperature of the rolled piece after final rolling; and the cooling speed and the cooling temperature can be accurately controlled, and the phenomenon that harmful martensite structures are generated due to supercooling to cause unqualified products is avoided. By arranging the annular high-speed compressed air flow between the output devices, the high-pressure air flow can limit the action time of the surface of the rolled piece and water, isolate the water adsorption of the surface of the rolled piece, limit the reaction of the wire rod and the water during the high/medium temperature stage, inhibit the generation of reddish-brown iron oxyhydroxide and iron sesquioxide on the surface of the rolled piece, and improve the surface quality and appearance of the rolled piece.

additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

for the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a process flow chart of temperature control and surface red rust inhibition for wire rod of example 1;

FIG. 2 is a process flow chart of temperature control and surface red rust inhibition for wire rod of example 2;

FIG. 3 is a process flow chart of temperature control and surface red rust inhibition for wire rod of embodiment 3 of the present invention.

Reference numerals: the device comprises a final mill unit 1, a temperature control water cooling device 2, an output roller bed 3, a high-speed compressed air ring 4, a flying shear 5, an output guide groove 6, a high-speed compressed air box 7 and a laying head 8.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.