阅读说明：本技术 一种用于控制无取向硅钢阻尼厚度波动的硅钢片生产工艺 (Production process of silicon steel sheet for controlling damping thickness fluctuation of non-oriented silicon steel ) 是由 钱京学 丁美良 于 2019-08-23 设计创作，主要内容包括：本发明公开了一种用于控制无取向硅钢阻尼厚度波动的硅钢片生产工艺,包括如下步骤：a、将连铸坯送入加热炉中进行加热；b、将加热后的连铸坯进行热轧,热轧司炉温度为1130±20℃；c、将热轧后带钢进行卷取,卷取温度为650±20℃；d、将卷取后的成品卷进行堆冷；e、将冷却后的成品卷进行平整拉矫,拉矫机采用延伸率模式,拉矫延伸率在设置范围为1.3%-1.5%；f、将平整拉矫后带钢进行酸洗；g、将酸洗后带钢进行冷轧；h、将冷轧后带钢进行卷取,得到硅钢片成品。所述工艺,通过修改工艺流程,可以显著消除无取向硅钢阻尼厚度波动缺陷。(The invention discloses a production process of a silicon steel sheet for controlling damping thickness fluctuation of non-oriented silicon steel, which comprises the following steps: a. feeding the continuous casting into a heating furnace for heating; b. carrying out hot rolling on the heated continuous casting billet, wherein the temperature of a hot rolling furnace is 1130 +/-20 ℃; c. coiling the hot rolled strip steel, wherein the coiling temperature is 650 +/-20 ℃; d. performing stack cooling on the coiled finished product coil; e. leveling, pulling and straightening the cooled finished coil, wherein the pulling and straightening machine adopts an elongation rate mode, and the pulling and straightening elongation rate is 1.3% -1.5% in a setting range; f. pickling the flattened, pulled and straightened strip steel; g. cold rolling the pickled strip steel; h. and coiling the cold-rolled strip steel to obtain a finished silicon steel sheet product. According to the process, the defect of damping thickness fluctuation of the non-oriented silicon steel can be obviously eliminated by modifying the process flow.)

1. A production process of silicon steel sheets for controlling damping thickness fluctuation of non-oriented silicon steel is characterized by comprising the following steps:

a. feeding the continuous casting into a heating furnace for heating;

b. carrying out hot rolling on the heated continuous casting billet, wherein the temperature of a hot rolling furnace is 1130 +/-20 ℃;

c. coiling the hot rolled strip steel at the coiling temperature of 650 +/-20 ℃;

d. performing stack cooling on the coiled finished product coil;

e. leveling, pulling and straightening the cooled finished coil, wherein the pulling and straightening machine adopts an elongation rate mode, and the setting range of the pulling and straightening elongation rate is 1.3% -1.5%;

f. pickling the flattened, pulled and straightened strip steel;

g. cold rolling the pickled strip steel;

h. and coiling the cold-rolled strip steel to obtain a finished silicon steel sheet product.

2. The process for producing silicon steel sheets for controlling damping thickness fluctuation of non-oriented silicon steel as claimed in claim 1, wherein in the step f, the pickling is performed in a three-stage mode, the hydrochloric acid concentration at the inlet stage is more than 50g/L, and the iron ion concentration is less than 130 g/L; the concentration of hydrochloric acid in the middle section is more than 100g/L, and the concentration of iron ions is less than 100 g/L; the concentration of hydrochloric acid at the outlet section is more than 160g/L, and the concentration of iron ions is less than 50 g/L.

3. The process for producing silicon steel sheets for controlling damping thickness fluctuation of non-oriented silicon steel as set forth in claim 1 or 2, wherein in the step f, the traveling speed of the strip steel in the pickling section is less than or equal to 100 mpm.

4. The process for producing silicon steel sheet for controlling damping thickness fluctuation of non-oriented silicon steel as set forth in claim 3, wherein in the step f, the residual iron on the surface of the pickled strip steel is not more than 30mg/m²。

5. The process for producing silicon steel sheets for controlling damping thickness fluctuation of non-oriented silicon steel as set forth in claim 4, wherein in the step g, the surface roughness of the work rolls of the cold rolling mill is between 1.3 μm and 1.6 μm.

6. The process for producing silicon steel sheets for controlling damping thickness fluctuation of non-oriented silicon steel as set forth in claim 1, wherein in the step d, the finished coils are stacked in a ventilating place or an outdoor warehouse for natural cooling in a normal temperature environment.

Technical Field

The invention relates to the technical field of silicon steel production and coil rolling, in particular to a silicon steel sheet production process for controlling damping thickness fluctuation of non-oriented silicon steel.

Background

Silicon steel refers to an ultra-low carbon silicon-iron alloy with silicon content of 0.5 to 4.5%, is mainly used as iron cores of various motors, generators, compressors, motors and transformers, and is an indispensable raw material product in the industries of electric power, household appliances and the like. The product needs to be stripped, stamped and laminated in the processing process, so that a high lamination coefficient is needed. The surface of the silicon steel sheet is smooth and flat, and the thickness of the silicon steel sheet is uniform, so that the silicon steel sheet is an important factor for ensuring the high lamination coefficient of the iron core. The current same-plate difference control requirement of silicon steel is less than or equal to 7 microns, and the problems of high iron loss, inconsistent magnetic performance and the like caused by gaps of laminated sheets due to large same-plate difference of the silicon steel seriously influence the quality and grade of silicon steel products. The most typical type is that the too large same plate difference is caused by damping thickness fluctuation, and the thickness fluctuation is a specific type of silicon steel variety, and the thickness fluctuation curve is in a bell mouth shape and generally exists in a whole roll or a half roll, as shown in fig. 1. The damping thickness fluctuation is caused by the fact that iron scales on the surface of the strip steel are left after pickling, so that a roller slips in the cold rolling process, the slip probability is increased due to too low roughness of the roller, and the strip steel finally generates the damping thickness fluctuation due to the slip of the roller.

The iron scale residue after pickling is influenced by a plurality of reasons, and the iron scale residue on the surface of the strip steel can be caused in the processes of hot rolling, pickling and cold rolling. Wherein, in the aspect of hot rolling: the furnace temperature is too high, so that the furnace-generated oxide scale is difficult to remove, and the matrix is pressed in the hot rolling process, so that the subsequent descaling is difficult; the hot coil iron scale is thickened due to overhigh coiling temperature and too slow steel coil stacking cooling speed. And (3) cold rolling: the tension leveler has poor scale breaking effect on the surface of the strip steel; the pickling speed is too fast, the pickling hydrochloric acid concentration is low, and the iron ion concentration is high, so that poor pickling is caused.

Disclosure of Invention

The invention provides a silicon steel sheet production process for controlling damping thickness fluctuation of non-oriented silicon steel, aiming at solving the problem of damping thickness fluctuation of silicon steel sheet products, and the specific technical scheme is as follows:

a production process of silicon steel sheets for controlling damping thickness fluctuation of non-oriented silicon steel comprises the following steps:

a. feeding the continuous casting into a heating furnace for heating;

b. carrying out hot rolling on the heated continuous casting billet, wherein the temperature of a hot rolling furnace is 1130 +/-20 ℃;

c. coiling the hot rolled strip steel, wherein the coiling temperature is 650 +/-20 ℃;

d. performing stack cooling on the coiled finished product coil;

e. leveling, pulling and straightening the cooled finished coil, wherein the pulling and straightening machine adopts an elongation rate mode, and the setting range of the pulling and straightening elongation rate is 1.3% -1.5%;

f. pickling the flattened, pulled and straightened strip steel;

g. cold rolling the pickled strip steel;

h. and coiling the cold-rolled strip steel to obtain a finished silicon steel sheet product.

In the step f, a three-section mode is adopted for acid washing, the concentration of hydrochloric acid at an inlet section is more than 50g/L, and the concentration of iron ions is less than 130 g/L; the concentration of hydrochloric acid in the middle section is more than 100g/L, and the concentration of iron ions is less than 100 g/L; the concentration of hydrochloric acid at the outlet section is more than 160g/L, and the concentration of iron ions is less than 50 g/L.

As an improvement of the scheme, in the step f, the advancing speed of the strip steel at the pickling section is less than or equal to 100 mpm.

In the step f, the residual iron on the surface of the strip steel after acid cleaning is not more than 30mg/m²。

In the step g, the surface roughness of the work roll of the cold rolling mill is between 1.3 and 1.6 mu m.

As an improvement of the scheme, in the step d, the finished product coil is stacked to a ventilation position or an outdoor warehouse for natural cooling in a normal temperature environment.

Compared with the prior art, the technical scheme adopted by the invention has the technical effects that:

1. the production process of the silicon steel sheet for controlling the damping thickness fluctuation of the non-oriented silicon steel, disclosed by the invention, can obviously eliminate the damping thickness fluctuation defect of the non-oriented silicon steel by modifying the process flow.

2. The production process of the silicon steel sheet for controlling the damping thickness fluctuation of the non-oriented silicon steel, disclosed by the invention, can achieve the effect by optimizing the furnace temperature, the coiling temperature, the cooling speed and the like of a hot rolling process, and the straightening and withdrawal process, the pickling process, the roller roughness and the like of a cold rolling process, does not need equipment and system transformation, and is easy to realize.

Drawings

FIG. 1, steel strip thickness measurement diagram: an X axis: length of the steel strip; y-axis: thickness of the steel strip.

Detailed Description

The following describes the embodiments of the present invention in detail, and the following examples employ facilities of a 1450 hot continuous rolling line and a 1420 cold continuous rolling line.

The method comprises the following steps of:

a. feeding the continuous casting into a heating furnace for heating;

b. carrying out hot rolling on the heated continuous casting billet, wherein the hot rolling temperature is 1170 +/-20 ℃;

c. coiling the hot rolled strip steel, wherein the coiling temperature is not more than 700 +/-20 ℃;

d. performing stack cooling on the coiled finished product coil;

e. leveling, pulling and straightening the cooled finished coil, wherein a pressure mode is adopted by a pulling and straightening machine, and the elongation of the strip steel is 0.7% in the pressure mode;

f. carrying out conventional pickling on the strip steel after the leveling and pulling-straightening, wherein the pickling speed is 180-;

g. cold rolling the pickled strip steel, wherein the roughness of a working roll of a cold rolling mill is =1.0 μm;

h. and coiling the cold-rolled strip steel to obtain a finished silicon steel sheet product.

48 coils of finished steel are produced in batches according to the process, the finished specification is 0.5mm 1220mm, 8 coils of finished steel have damping thickness fluctuation, and the defect occurrence ratio is 16.67%. The measurement data are shown in fig. 1. Simultaneously, the residual iron on the surface of a coil of cold-rolled finished product is sampled and detected, and the residual iron value is 92.6mg/m²The surface has more residual iron.

The production process of the silicon steel sheet for controlling the damping thickness fluctuation of the non-oriented silicon steel, which is disclosed by the application, comprises the following steps:

a. feeding the continuous casting into a heating furnace for heating;

b. carrying out hot rolling on the heated continuous casting billet, wherein the temperature of a hot rolling furnace is 1130 +/-20 ℃;

c. coiling the hot rolled strip steel, wherein the coiling temperature is 650 +/-20 ℃;

d. stacking and cooling the coiled finished product coil, and stacking the finished product coil to a ventilation position or naturally cooling the finished product coil in an outdoor warehouse under a normal temperature environment;

e. leveling, pulling and straightening the cooled finished coil, wherein the pulling and straightening machine adopts an elongation rate mode, and the pulling and straightening elongation rate is 1.3-1.5%;

f. carrying out acid washing on the strip steel after the leveling, pulling and straightening, wherein the acid washing adopts a three-section mode, the concentration of hydrochloric acid at an inlet section is more than 50g/L, and the concentration of iron ions is less than 130 g/L; the concentration of hydrochloric acid in the middle section is more than 100g/L, and the concentration of iron ions is less than 100 g/L; the concentration of hydrochloric acid at the outlet section is more than 160g/L, the concentration of iron ions is less than 50g/L, the advancing speed of strip steel at the pickling section is less than or equal to 100mpm, and the residual iron on the surface of the pickled strip steel is controlled not to exceed 30mg/m²；

g. Cold rolling the pickled strip steel, wherein the surface roughness of a working roll of a cold rolling mill is between 1.3 and 1.6 mu m;

h. and coiling the cold-rolled strip steel to obtain a finished silicon steel sheet product.

44 rolled steel products are produced in batches according to the process, the specification of the finished products is 0.5mm x 1220mm, damping thickness fluctuation does not occur in all the finished products, and the defect occurrence ratio is 0%. Simultaneously, the residual iron on the surface of a coil of cold-rolled finished product is checked in a sampling way, and the value of the residual iron is 28.5mg/m²。

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.