CN112474818A - Method for controlling surface characteristics of ultrathin precise stainless steel foil - Google Patents
Method for controlling surface characteristics of ultrathin precise stainless steel foil Download PDFInfo
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- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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Abstract
The invention relates to a method for controlling the surface characteristics of an ultrathin precise stainless steel foil, which comprises the following steps: 1) according to the requirements of the surface type and the surface roughness of the target finished product of the ultrathin precise stainless steel foil, a roller which is made of molybdenum-series high-speed steel M2 and has the diameter of 21-23 mm is selected for texturing to prepare a textured roller, wherein the type and the roughness of the textured roller are determined according to the surface type and the surface roughness of the target finished product; 2) and (3) selecting a stainless steel strip raw material with the thickness of 0.05-0.1 mm for rolling, and determining rolling pass distribution and roughing roller selection in a finished product rolling process according to the surface type of a target finished product and the total rolling deformation of the finished product rolling process in the rolling process. The method can effectively control the roughness, the glossiness and the surface texture of the product, has small thickness tolerance fluctuation, good plate shape straightness and stable surface quality, and meets the high-quality requirement of the high-end industry of the ultrathin precise stainless steel foil.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a method for controlling surface characteristics of an ultrathin precise stainless steel foil.
Background
The ultra-thin precise stainless steel foil is stainless steel strip with the thickness of less than 0.05mm, the thinnest thickness widely applied in the market of the product at present reaches 0.02mm, and the ultra-thin precise stainless steel foil is favored by high-end and top-end markets due to good mechanical properties and light and thin characteristics. With the increasing requirements on products, the requirements on surface characteristics such as roughness, glossiness and rolling texture of the surface of the stainless steel strip are more precise and strict, and the surface of the stainless steel strip with the thickness of 0.02mm is expected to be more diversified in various industries such as military industry, nuclear power industry and solar industry. The existing production of ultrathin precise stainless steel foil is still in a normalized production, and the rolling production of different surface roughness and glossiness is a big bottleneck of ultrathin precise stainless steel foil products.
In the rolling process of the ultrathin precise stainless steel foil, because the required rolling tension and pressure are relatively large, the problems of strip drawing, strip breakage, surface color difference, uneven roughness, rolling texture difference, poor plate shape and the like are easy to occur in the rolling process. And the roller with higher roughness is used for rolling, the surface roughness attenuation of the roller is obvious in the rolling process, so that the surface roughness of the ultrathin precise stainless steel foil is uneven, the rolling texture is different, and the control difficulty of the rolling thickness and the hardness is high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for controlling the surface characteristics of ultrathin precise stainless steel foil which can produce different surface roughness, glossiness and surface texture and has consistent surface uniformity.
The method for controlling the surface characteristics of the ultrathin precise stainless steel foil comprises the following steps:
1) the method comprises the following steps of selecting a roller which is made of molybdenum-series high-speed steel M2 and has a diameter of 21-23 mm for texturing processing to prepare a texturing roller, wherein the type and the roughness of the texturing roller are determined according to the surface type and the surface roughness of a target finished product of the ultrathin precise stainless steel foil, and the corresponding relation between the type and the roughness of the texturing roller and the surface type and the surface roughness of the target finished product is as follows:
2) selecting a stainless steel strip raw material with the thickness of 0.05-0.1 mm for rolling, wherein the rolling finished product rolling process is as follows:
and determining the distribution of rolling passes and the selection of the texturing rollers in the finished product rolling process according to the surface type of the target finished product and the total rolling deformation of the finished product in the rolling process.
Preferably, in the method for controlling the surface characteristics of the ultra-thin precise stainless steel foil, for the target finished product with the surface types of polished surface, electroplated surface and finely ground surface, the roughened roller roughness is obtained according to the formula B1 ═ Z1 × (1.1-1.2) according to the requirement of the target finished product surface roughness, wherein B1 is the surface roughness of the polished surface, the electroplated surface and the finely ground surface, and Z1 is the roughened roller roughness; for the surface type of the target finished product is a wire drawing surface, obtaining the roughness of the texturing roller according to the formula B2-Z2 x (0.7-0.8) according to the requirement of the surface roughness of the target finished product, wherein B2 is the surface roughness of the wire drawing surface, and Z2 is the roughness of the wire drawing roller; for the surface type of the target finished product, obtaining the roughness of the roughening roller according to the formula B3-Z3 x (0.4-0.5) according to the surface roughness requirement of the target finished product, wherein B3 is the surface roughness of the sand blasting surface, and Z3 is the roughness of the sand blasting roller; and for the surface type of the target finished product, obtaining the roughness of the roughened roller according to the formula B4-Z4 x (0.15-0.25) according to the requirement of the surface roughness of the target finished product, wherein B4 is the surface roughness of the matte and Z4 is the roughness of the sand blasting roller.
Preferably, in the method for controlling the surface characteristics of the ultra-thin precision stainless steel foil, when the sand blasting roller is used for rolling, the flow rate of rolling oil is controlled to be not less than 450L/min, and the rolling speed is controlled to be within 150 m/min.
Preferably, in the method for controlling the surface properties of the ultra-thin precision stainless steel foil described above, when the sandblasting roll or the wire drawing roll is used for rolling, the rolling deformation is controlled to be not more than 2%, and a new sandblasting roll or wire drawing roll is replaced after each pass of rolling is completed.
Preferably, in the method for controlling the surface characteristics of the ultra-thin precise stainless steel foil, a finish grinding roller with a roughness Ra of 0.18-0.22 um is used for the last rolling pass when the surface type of the target finished product is matte.
Preferably, in the method for controlling the surface characteristics of the ultra-thin precision stainless steel foil, during rolling, rolling oil is used for cooling, and the temperature of the rolling oil is controlled to be 40 +/-2 ℃.
Preferably, in the method for controlling the surface characteristics of the ultra-thin precise stainless steel foil, the thickness fluctuation during the rolling process of the finished product is controlled within +/-2 um.
As a specific embodiment, in the method for controlling the surface properties of the ultra-thin precision stainless steel foil, the rolling may further include an intermediate rolling process in addition to the finishing rolling process, wherein the intermediate rolling process is as follows:
and determining the distribution of rolling passes and the selection of the texturing rollers in the intermediate rolling process according to the surface type of the target finished product and the total rolling deformation of the finished product in the rolling process.
Preferably, in the method for controlling the surface properties of the ultra-thin precision stainless steel foil, the thickness fluctuation during the intermediate rolling is controlled within 3 um.
Preferably, in the method for controlling the surface properties of the ultra-thin precision stainless steel foil, the target finished thickness of the ultra-thin precision stainless steel foil is 0.02 mm.
The method for controlling the surface characteristics of the ultrathin precise stainless steel foil can effectively control the roughness, the glossiness and the surface texture of a product, has small thickness tolerance fluctuation, good plate shape straightness and stable surface quality, overcomes the defects of chromatic aberration, unstable roughness, poor plate shape, unstable hardness, uneven thickness and the like of the ultrathin precise stainless steel foil product, obviously improves the product quality, is suitable for industrial mass production, and meets the high-quality requirement of the high-end industry of the ultrathin precise stainless steel foil.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Figure 1 shows a photograph of a finished stainless steel foil with a surface of the type of wire drawing surface.
Figure 2 shows a photograph of a finished stainless steel foil product with a grit blasted finish as a surface type.
Fig. 3 shows a photograph of a finished stainless steel foil with a matte surface type.
Fig. 4 shows photographs of finished stainless steel foil products with surface types of plated surface and polished surface.
Fig. 5 shows a photograph of a finished stainless steel foil with a surface of the type of a finish.
FIG. 6 shows a graph of the surface roughness of a steel strip as a function of the roughness of the rolls.
Fig. 7 shows a graph of strain versus hardness for 304 stainless steel.
Detailed Description
Definition 1: as used herein, the term "ultra-thin precision stainless steel foil" refers to stainless steel strip having a thickness of 0.05mm or less.
Definition 2: herein, the term "stainless steel foil surface property" refers to the surface type, surface roughness and surface gloss of the finished stainless steel foil, wherein the surface type includes: a matte surface WM, a sandblasted surface PS, a wire-drawn surface LS, a polished surface PG, an electroplated surface DD, a finish ground surface CG, schematic diagrams of specific surface types see fig. 1 to 5.
Definition 3: herein, the term "profile curve a 6" refers to data when setting standard profile parameters in profile control, and has a direct relationship with the profile median wave, and the greater the setting value of the profile curve a6, the smaller the corresponding median wave.
Definition 4: herein, the term "profile curve a 1" refers to data when setting standard profile parameters in profile control, and has a direct relationship with the profile edge wave, and the greater the setting value of the profile curve a1, the greater the corresponding edge wave.
Definition 5: herein, the term "wave" refers to a defect of a plate shape, which is represented by a wavy bending defect having a rise and a fall in the rolling direction of a steel strip, and depending on the position of the wave distributed on the surface of the steel strip, the wave distributed on one side of the surface is called "single-side wave", the wave distributed on both sides of the surface is called "double-side wave", the wave distributed on the middle of the surface is called "middle wave", and the wave distributed on 1/4 is called "rib wave", i.e., "1/4 wave".
Definition 6: herein, the term "semi-finish grinding roll" means a work roll having a roughness Ra of 0.35 to 0.4um, and the roughness Ra of other types of rolling rolls such as "sand blasting roll", "wire drawing roll", "polishing roll", "plating roll", "finish grinding roll" is shown in Table 1 below.
The method for controlling the surface characteristics of the ultrathin precise stainless steel foil comprises the following steps:
1) according to the requirements of the surface type and the surface roughness of the target finished product of the ultrathin precise stainless steel foil, a roller which is made of molybdenum-series high-speed steel M2 and has the diameter of 21-23 mm is selected for texturing, and a grinding wheel, carborundum or abrasive belt is used for preparing the roller into a textured roller with a specified type and corresponding roughness, wherein the surface type and the surface roughness of the target finished product are as shown in Table 1:
TABLE 1 table of correspondence between surface type of finished product and roll
2) According to the requirements of the thickness and the hardness of a finished product, a stainless steel strip raw material with the thickness of 0.05-0.1 mm is selected to be rolled in an intermediate rolling process, wherein the difference between the steel plate and the plate is less than 2 percent, the burr rate is less than 10 percent, the steel rolling deflection degree of the stainless steel strip is not more than 3mm, and the defects of rolling mill stop marks, overburning, edge cracking and the like cannot be caused in the strip steel. In the middle rolling process, different types of rollers are selected for rolling according to different rolling deformation and different surface types of target finished products, as shown in table 2:
TABLE 2 comparison table for middle rolling mill roll
The thickness fluctuation must be ensured within 3um in the middle rolling process, the rolling oil is used for cooling, and the temperature of the rolling oil is controlled within 40 +/-2 ℃. The rolling oil flow of the rolling pass of the sand blasting roller is controlled to be not less than 450L/min, and the rolling speed is controlled within 150 m/min. The plate type curve a6 in the middle rolling process is set to be 15-20, so that the steel strip is ensured to have no middle waves or 1/4 waves.
4) And carrying out solution annealing on the steel coil rolled in the intermediate rolling process, wherein if the steel coil can meet the performance requirement of the target finished product of the ultrathin precise stainless steel foil after the solution annealing, the intermediate rolling process is the finished product rolling process and is carried out according to the finished product rolling process. And carrying out rolling in a finished product rolling process after the solution annealing. The rolling oil temperature is controlled within 40 +/-2 ℃ and the thickness fluctuation is controlled within +/-2 um during rolling of the finished product. The steel belt is slightly rippled, and 1/4 rippling is eliminated. In the rolling process of the finished product, according to the difference of rolling deformation and the surface type of the target finished product, different rolling passes are distributed and different types of rollers are selected for rolling, as shown in table 3:
TABLE 3 comparison table of rolling pass distribution and roller usage of finished product
When the sand blasting roller is used for rolling, the flow of rolling oil is controlled to be not less than 450L/min, and the rolling speed is controlled to be within 150 m/min. In the finishing rolling, the deformation amount of the pass using the sandblasting roll is set to not more than 2%, and the deformation amount of the pass using the wire drawing roll is set to less than 2%. The plate type curve a6 in the finished product rolling process is set to be 18-20, and a1 is set to be 5, so that no middle wave or 1/4 wave exists in the steel strip.
Preferably, the last pass uses a fine grinding roller with a roughness Ra of 0.18-0.22 um for a target product surface type of WM.
As a specific embodiment, in the method for controlling the surface property of the ultra-thin precision stainless steel foil according to the present invention, the control of the surface type, surface roughness and surface gloss of the finished stainless steel foil is mainly the control of roll roughness. According to actual production conditions and production data, the surface roughness of the CG, DD and PG surfaces is close to the roller roughness, and the relation between the surface roughness and the roller roughness is B1 ═ Z1 × (1.1-1.2), wherein B1 is the surface roughness of the CG, DD and PG surfaces, and Z1 is the roller roughness. Therefore, the roll roughness of the CG, DD and PG surfaces is obtained according to the formula B1 ═ Z1 × (1.1-1.2) according to the surface roughness requirements, and the surface type and the surface roughness of the finished stainless steel foil can be controlled. For LS, PS and WM surfaces, the roughness of the used roller is high, and the deviation between the surface roughness and the roller roughness can obviously occur in the rolling process. Therefore, a relation graph of the surface roughness of the stainless steel foil and the roughness of the rolling roller shown in fig. 6 is obtained by combining mass production data, and based on the relation graph, a relation formula B2 between the surface roughness of the LS surface and the roughness of the wire drawing roller is Z2 x (0.7-0.8), wherein B2 is the surface roughness of the LS surface, and Z2 is the roughness of the wire drawing roller; the relation between the surface roughness of the PS surface and the roughness of the sand blasting roller is B3 ═ Z3 × (0.4-0.5), wherein B3 is the surface roughness of the PS surface, and Z3 is the roughness of the sand blasting roller; the relation between the surface roughness of the WM surface and the sandblasting roller roughness is B4 ═ Z4 × (0.15-0.25), wherein B4 is the surface roughness of the WM surface, and Z4 is the sandblasting roller roughness. Therefore, the roll roughness of CG, DD and PG surfaces can be obtained according to the formula B2 ═ Z2 × (0.7 to 0.8), B3 ═ Z3 × (0.4 to 0.5) and B4 ═ Z4 × (0.15 to 0.25), respectively, according to the requirements for the surface roughness, so that the surface type and surface roughness of the finished stainless steel foil can be controlled.
As a specific embodiment, the correspondence of roll roughness to surface type, surface roughness and surface gloss can be determined simply according to the following table:
preferably, in the method for controlling the surface characteristics of the ultra-thin precise stainless steel foil, because the roughness of the sandblasting surface and the wire drawing surface is high, the average thickness of the surface of the steel strip must be calculated according to the roughness when calculating the deformation of the finished product in the rolling process, and then the deformation is calculated by using the average thickness, otherwise, the hardness of the rolled finished product cannot meet the requirements of customers.
Preferably, in the method for controlling the surface characteristics of the ultra-thin precision stainless steel foil according to the present invention, the sandblasting roll surface is adhered with silicon carbide, thereby reducing the hardness of the roll surface, and the rolling pressure is increased by increasing the elastic flattening amount of the roll during rolling, but the deformation amount of the steel strip is very small, the roughness of the wire drawing roll surface is high, the rolling resistance is high, and the rolling pressure is also increased, but the deformation amount of the steel strip is very small, so that the rolling deformation amount is set to be within 2% when the sandblasting roll or the wire drawing roll is used for rolling, and the sandblasting roll or the wire drawing roll must be replaced with a new one after each rolling pass. Normally, the rolling mill cannot roll normally. However, the SUNDWIG four-upright twenty-high roll mill has extremely high thickness control precision, rolling pressure fluctuation is small when ultrathin precise stainless steel foil is rolled, and the thickness reduction is ensured to be within 1um only by stably controlling the rolling pressure, but the surface texture form is obviously changed. Therefore, the rolling of the ultrathin stainless steel foil can be realized by adjusting the rolling pressure and changing the surface texture under the condition of hardly changing the measured thickness and only changing the average thickness. In addition, the sand blasting rollers are used for rolling, two times of rolling are needed, each pair of sand blasting rollers can only be used for rolling one time, and a new sand blasting roller needs to be replaced after each time of rolling is finished, so that the problems of inconsistent head and tail roughness and surface color difference caused by surface roughness attenuation of the sand blasting rollers are solved.
Preferably, in the ultra-thin precise stainless steel foil surface property control method of the present invention, since high roughness rolls such as sand blasting rolls and wire drawing rolls are used, the surface of the stainless steel foil is uneven during rolling, and the deviation of the actual thickness measured by a micrometer (the distance between the salient points on the upper and lower surfaces of the steel strip) from the average thickness measured by a thickness gauge is large. Therefore, in the middle rolling process, the deformation amount is calculated by calculating the average thickness measured by a thickness gauge instead of calculating the actual thickness measured by a micrometer. However, in the rolling of the finished product, the deformation is calculated by the actual thickness measured by a micrometer rather than the average thickness measured by a thickness gauge.
Preferably, in the method for controlling the surface characteristics of the ultrathin precise stainless steel foil, except for the finished product pass and the rolling pass using the sand blasting roller, all the semi-fine grinding rollers are used in the rolling process, so that the condition that the spiral grains are generated, the finished product pass cannot be eliminated, and the surface quality is finally influenced is avoided.
Preferably, in the method for controlling the surface characteristics of the ultrathin precise stainless steel foil, the plate flatness of the intermediate rolling process is ensured to be less than 6IU, namely, the maximum difference of relative extension per meter along the length direction of the stainless steel foil is 0.06mm, no stop mark or extraction mark exists in a coil, and the weight of a single coil is less than 1000 kg.
Preferably, in the method for controlling the surface characteristics of the ultra-thin precise stainless steel foil, the rolling oil temperature, the rolling oil amount and the rolling speed of the finished product must be strictly controlled according to the rolling process.
The invention adopts a SUNDWIG four-upright-post twenty-high roll mill, a unique rolling process and a roll processing method to roll and produce the ultrathin precise stainless steel foil, so that the roughness, the glossiness and the surface texture of the product are effectively controlled, the thickness tolerance fluctuation is small, the flatness of the plate shape is good, the surface quality is stable, the defects of chromatic aberration, unstable roughness, poor plate shape, unstable hardness, uneven thickness and the like of the ultrathin precise stainless steel foil product are overcome, the product quality is obviously improved, and the method is suitable for industrial mass production and meets the high-quality requirement of the high-end industry of the ultrathin precise stainless steel foil.
In order to make the technical solutions of the present invention more clear, the following will clearly and completely describe the technical solutions of the present invention with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
Example 1
The surface of a target finished product is WM, the steel grade is 304 stainless steel, the thickness is 0.02mm, the width is 600mm, the hardness requirement is 270-300 Hv, and the surface roughness Ra is 0.35-0.5 um.
And determining the thickness of the raw material of the rolling process of the finished product according to the hardness requirement of the target finished product material. Specifically, as can be seen from a relationship diagram of the strain and hardness of 304 stainless steel shown in fig. 7, the hardness of the target finished product is required to be 270-300 Hv, and correspondingly, the total deformation of the finished product in the rolling process is controlled to be 9-10%, so that the thickness of the raw material in the rolling process of the finished product can be determined to be 0.022-0.0225 mm based on the total deformation of 9-10% and the target thickness of the finished product of 0.02 mm. As the sand blasting roller is used, the surface roughness is high, and the measured actual thickness is 3-5 um thicker than the average thickness measured by the thickness gauge. But the hardness of the finished product is determined by the variation of the average thickness, so that the actual measurement value of the intermediate thickness in the intermediate rolling process does not need to be concerned too much, and only the final rolling average thickness value in the intermediate rolling process and the thickness deformation of the final finished product need to be ensured to be 9-10%.
The rolling scheme is as follows: a304 stainless steel coil with the thickness of 0.05mm and the width of 600mm is selected, and the rolling thickness of a finished product pass in the middle rolling process is set to be 0.022 mm. The last two passes used a grit blasting roller with roughness Ra of 1.7 um. And carrying out solution annealing treatment, and then carrying out rolling in a finished product rolling process. The finished product rolling process is rolled by thickness 0.022mm and is 0.02mm, can satisfy roughness Ra and be 0.35 ~ 0.5um, and the hardness is the requirement of 270 ~ 300Hv, specifically includes:
firstly, ultra-thin stainless steel raw materials with the thickness of 0.05mm are subjected to cold rolling by a SUNDWIG four-upright-column twenty-high-roll mill, jaboticaba rolling oil is adopted for lubricating and cooling during rolling, the temperature of the rolling oil is 40 +/-2 ℃, and the rolling oil is rolled to be 0.022mm in 6 passes. The semi-fine grinding roller made of M2 material with the diameter of 21-23 mm is used for 1-4 passes of rolling, the rolling speed is controlled within 200M/min, and the flow rate of cooling oil is set to be 300L/min. Using an M2 sand blasting roller with the diameter of 21-23 mm during 5 and 6 passes of rolling, and setting the flow rate of cooling oil to be 450L/min; the thickness of the 6 th pass of rolling is set to be 0.022mm, the average rolling thickness is rolled to be 0.022mm according to the measurement parameters of a thickness gauge, and actual thickness measurement is not carried out.
The intermediate rolling process is shown in the following table:
the deformation of the 1 st pass is controlled to be 30-35 percent; the rolling speed is controlled within 200 m/min; the semi-fine grinding roller is used in the 1 st to 4 th passes, the roller is required to be made of M2 material with the diameter ranging from 21 mm to 23mm, and the surface of the roller cannot be provided with grinding spiral grains; the sand blasting rollers made of M2 materials with the diameter within the range of 21-23 mm are used in the 5 th and 6 th passes, the flow of rolling oil is adjusted to 450L/min, the rolling speed is controlled within 150M/min, and surface color difference caused by insufficient lubrication in the rolling process of the high-roughness roller is avoided; the reason why the profile curve is adjusted from a 6-15 to a 6-18 in the 5 th and 6 th passes is to prevent the problem of 1/4 waves caused by low surface hardness of the sandblasting roller. The deformation of the 5 th and 6 th passes is less than 2%, and the rolling pressure opening pressure control is performed to well control the surface roughness.
The rolled steel coil passes through a vertical continuous bright annealing furnace with the temperature of 1050 +/-5 ℃ at the speed of 50m/min for solution treatment, and full hydrogen protective gas with high purity (99.999%) is adopted to prevent the surface of the steel strip from being oxidized and prevent interlaminar dislocation during coiling, and the tension is set as 20N/mm2。
And (3) rolling the ultra-thin stainless steel foil subjected to solution treatment in a finished product rolling process on a SUNDWIG four-upright twenty-high roll mill, wherein rolling oil is still adopted as a cooling lubricant during rolling, the temperature is controlled to be 40 +/-2 ℃, and a 0.022mm steel strip is rolled to a finished product thickness of 0.02mm through 1-pass rolling. The working roll is a finish grinding roll made of M2 material and with the diameter of 21-23 mm. The rolling process is shown in the following table:
and in the finished product rolling process, the plate profile curve a6 is adjusted to be 18, and the a1 is adjusted to be 5, so that the convexity and edge warping of the target plate profile are increased, and 1/4 waves and middle waves are eliminated in the rolling process. And measuring the thickness by using a micrometer when the pass of the rolled finished product is finished, and finely adjusting the rolled thickness according to the actually measured thickness. The surface must be inspected during starting to ensure that the surface is free of surface defects such as ribbing, helical lines, and the like.
The main technical indexes of the product produced by the process can reach as follows:
1) thickness deviation: 0.02 plus or minus 0.001 mm; 2) vickers hardness: (270-300) HV; 3) flatness: 6 IU; 4) surface roughness Ra: 0.35-0.5 um; 5) surface quality: the surface is uniform and consistent, the defects of chromatic aberration, spiral lines, sand drop marks and the like are avoided, the scratch resistance of the surface is strong, and the glossiness is uniform.
Example 2
The target finished product is an ultrathin precise stainless steel foil with a PS surface, a width of 600mm, a steel grade of 316 stainless steel, a hardness of 160-180 Hv, a surface roughness Ra of 0.8-1.1 um and a thickness of 0.02 mm.
The rolling scheme is as follows: the method comprises the following steps of selecting 316 steel type ultrathin stainless steel with the thickness of 0.05mm and the width of 600mm, rolling the thickness of a raw material into 0.02mm by using a semi-fine grinding roller and a sand blasting roller with the roughness Ra of 2.0um, and finally meeting the requirement of hardness 160-180 Hv after annealing treatment, wherein the method specifically comprises the following steps:
firstly, rolling ultrathin stainless steel with the thickness of 0.05mm by a SUNDWIG four-upright-post twenty-high roll mill, cooling and lubricating the ultrathin stainless steel by adopting Jia Shi rolling oil during rolling, controlling the temperature of the rolling oil to be 40 +/-2 ℃, and rolling the ultrathin stainless steel to be 0.02mm by adopting 7 passes. The rolling process is shown in the following table:
the deformation of the 1 st pass is controlled to be 30-35 percent; the rolling speed is controlled within 200 m/min; the semi-fine grinding roller is used in the 1 st to 5 th passes, the roller is required to be made of M2 material with the diameter ranging from 21 mm to 23mm, and the surface of the roller cannot be provided with grinding spiral grains; the sand blasting rollers made of M2 materials with the diameter within the range of 21-23 mm are used in the 6 th pass and the 7 th pass, the flow rate of rolling oil is adjusted to 450L/min, the rolling speed is controlled within 150M/min, and surface color difference caused by insufficient lubrication in the rolling process of the high-roughness roller is avoided; the reason why the profile curve is adjusted from a 6-15 to a 6-18 in the 6 th and 7 th passes is to prevent the problem of 1/4 waves caused by low surface hardness of the sandblasting roller. The deformation of the 6 th pass and the 7 th pass is less than 2 percent, and the rolling pressure opening pressure control is performed to well control the surface roughness.
The rolled steel coil passes through a vertical continuous bright annealing furnace with the temperature of 1050 +/-5 ℃ at the speed of 50m/min for solution treatment, and full hydrogen protective gas with high purity (99.999%) is adopted, so that the surface of the steel strip is not oxidized, interlaminar dislocation is prevented during coiling, and the tension is set to be 20N/mm2(ii) a And after annealing, the hardness of the finished product can be ensured to be 170-180 Hv, and the requirements of customers are met.
The main technical indexes of the product produced by the process can reach as follows:
1) thickness deviation: 0.02 plus or minus 0.001 mm; 2) vickers hardness: (170-180) HV; 3) flatness: 6 IU; 4) surface roughness Ra: 0.8-1 um; 5) surface quality: the surface is uniform and consistent, the defects of chromatic aberration, spiral lines, sand falling marks and the like are avoided, the glossiness in all directions is uniform, the surface roughness is high, and the scratch resistance is strong.
It should be noted that the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (10)
1. A method for controlling the surface characteristics of an ultrathin precise stainless steel foil is characterized by comprising the following steps:
1) the method comprises the following steps of selecting a roller which is made of molybdenum-series high-speed steel M2 and has a diameter of 21-23 mm for texturing processing to prepare a texturing roller, wherein the type and the roughness of the texturing roller are determined according to the surface type and the surface roughness of a target finished product of the ultrathin precise stainless steel foil, and the corresponding relation between the type and the roughness of the texturing roller and the surface type and the surface roughness of the target finished product is as follows:
2) selecting a stainless steel strip raw material with the thickness of 0.05-0.1 mm for rolling, wherein the rolling finished product rolling process is as follows:
and determining the distribution of rolling passes and the selection of the texturing rollers in the finished product rolling process according to the surface type of the target finished product and the total rolling deformation of the finished product in the rolling process.
2. The method for controlling the surface properties of the ultra-thin precision stainless steel foil according to claim 1, wherein:
for the surface types of the target finished product, namely a polished surface, an electroplated surface and a finely ground surface, according to the surface roughness requirement of the target finished product, obtaining the roughness of the roughened roller according to the formula B1 (Z1 x (1.1-1.2), wherein B1 is the surface roughness of the polished surface, the electroplated surface and the finely ground surface, and Z1 is the roughness of the roughened roller;
for the surface type of the target finished product is a wire drawing surface, obtaining the roughness of the texturing roller according to the formula B2-Z2 x (0.7-0.8) according to the requirement of the surface roughness of the target finished product, wherein B2 is the surface roughness of the wire drawing surface, and Z2 is the roughness of the wire drawing roller;
for the surface type of the target finished product, obtaining the roughness of the roughening roller according to the formula B3-Z3 x (0.4-0.5) according to the surface roughness requirement of the target finished product, wherein B3 is the surface roughness of the sand blasting surface, and Z3 is the roughness of the sand blasting roller;
and for the surface type of the target finished product, obtaining the roughness of the roughened roller according to the formula B4-Z4 x (0.15-0.25) according to the requirement of the surface roughness of the target finished product, wherein B4 is the surface roughness of the matte and Z4 is the roughness of the sand blasting roller.
3. The method for controlling the surface properties of an ultra-thin precision stainless steel foil as claimed in claim 1, wherein the flow rate of the rolling oil is controlled to be not less than 450L/min and the rolling speed is controlled to be within 150m/min during the rolling using the sand blast roll.
4. The method for controlling the surface properties of an ultra-thin precision stainless steel foil according to claim 1, wherein the rolling deformation is controlled to be not more than 2% when the sand blasting roll or the wire drawing roll is used for rolling, and the sand blasting roll or the wire drawing roll is replaced with a new one after each rolling.
5. The method for controlling the surface properties of an ultra-thin precision stainless steel foil according to claim 1, wherein a finish grinding roll having a roughness Ra of 0.18 to 0.22um is used for the last pass of rolling in which the surface type of the target product is matte.
6. The method for controlling the surface properties of the ultra-thin precision stainless steel foil as claimed in claim 1, wherein the rolling process is carried out by cooling with rolling oil, and the temperature of the rolling oil is controlled to be 40 ± 2 ℃.
7. The method for controlling the surface properties of an ultra-thin precision stainless steel foil according to claim 1, wherein the thickness fluctuation during the finish rolling is controlled within ± 2 um.
8. The method for controlling the surface properties of an ultra-thin precision stainless steel foil according to claim 1, wherein the rolling comprises an intermediate rolling pass in addition to the finishing rolling pass, wherein the intermediate rolling pass is as follows:
and determining the distribution of rolling passes and the selection of the texturing rollers in the intermediate rolling process according to the surface type of the target finished product and the total rolling deformation of the finished product in the rolling process.
9. The method for controlling the surface properties of an ultra-thin precision stainless steel foil according to claim 8, wherein the thickness fluctuation during the intermediate rolling is controlled within 3 um.
10. The ultra-thin precision stainless steel foil surface property control method according to any one of claims 1 to 9, wherein the ultra-thin precision stainless steel foil target finished product thickness is 0.02 mm.
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