A straightening process for S31254 stainless steel thin strip

Abstract

The present application relates to a stainless precision strip steel production method, a S31254 stainless steel thin strip straightening process, comprising the following steps: step one: winding; step two: threading; step three: winding; step four: straightening. The present application effectively solves the quarter wave problem by adjusting the inlet gap, elongation, 7 sets of support roller height and other modes. The parameters of the present application can realize the wave height / wave length of S31254 stainless steel precision thin strip after quarter wave straightening is less than or equal to 3IU.

Description

Technical Field

[0001] This invention relates to a method for producing stainless precision strip steel, and more particularly to a straightening process for S31254 stainless steel thin strip. Background Technology

[0002] S31254 is an austenitic stainless steel. Due to its high molybdenum content, S31254 has high corrosion resistance and is widely used in seawater desalination and chemical projects.

[0003] Due to the unique properties of the material and the configuration of the rolling mill rolls, when S31254 stainless steel is rolled to a thickness of less than 0.1 mm, a wave pattern is generated located at one-quarter of the distance from the edge of the steel strip. This one-quarter wave can be classified into three types based on its location: a. operating-side one-quarter wave, b. transmission-side one-quarter wave, and c. double-one-quarter wave. Straightening this one-quarter wave is difficult during subsequent tension leveling, affecting product quality.

[0004] The purpose of this invention is to provide a method for straightening S31254 stainless steel precision thin strip, which effectively solves the problem of quarter wave by adjusting the inlet gap, elongation, and height of the 7 sets of support rollers. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a straightening process for S31254 stainless steel strip.

[0006] The objective of this invention is achieved as follows: A straightening process for S31254 stainless steel strip includes the following steps: Step 1: Coiling: S31254 stainless steel strip with a thickness of less than 0.1mm is coiled onto the uncoiler of a tension leveling device, with an uncoiling tension set to 2.5~2.9KN; Step 2: Threading: The strip head is clamped by a feeding trolley, and the strip is pulled through a brake tension roller, an oiling device, a tension measuring device, a straightener, and a tensioning device, with a threading speed set to 5~8m / min; Step 3: Winding: The passed strip head is wound onto the winding machine of the tension leveling device, with a winding tension set to 2.9-3.3KN; Step 4: Straightening: The straightening process is divided into three dimensions: X—the running direction of the steel strip, Y—the vertical direction of the strip, and so on. For the straight steel strip running direction, Z—the width direction of the steel strip, the specific implementation method is as follows: X—the running direction of the steel strip: the straightening process parameter in the running direction of the steel strip is the tensile elongation rate, with a range of 2%~3%; Y—perpendicular to the running direction of the steel strip: the straightening process parameter in the perpendicular direction of the steel strip is the inlet gap of the tensile roller box, with a range of -3~-3.5mm; Z—the width direction of the steel strip: the straightening in the width direction of the steel strip relies on seven sets of independent support rollers located in the lower roller box. Above the support rollers are intermediate rollers, and above the intermediate rollers are work rollers. The seven sets of support rollers divide the work rollers into seven control units, and the height is adjusted hydraulically to achieve straightening in the width direction of the steel strip.

[0007] The specific implementation parameters for the seven sets of support rollers in the Z-direction of the steel strip width in step four are as follows: When the plate type is a quarter-wave on the control side: support roller 1 / mm: -0.05~-0.10, support roller 2 / mm: -0.15~-0.20, support roller 3 / mm: -0.05~-0.10, support roller 4 / mm: -0.00~-0.03, support roller 5 / mm: -0.00~-0.03, support roller 6 / mm: -0.00~-0.03, support roller 7 / mm: -0.00~-0.03; When the plate type is a quarter-wave on the transmission side: support roller 1 / mm: -0.00~-0.03, support roller 2 / mm: -0.00~-0.03, support roller 3 / mm: - 0.00~-0.03, Support roller 4 / mm: -0.00~-0.03, Support roller 5 / mm: -0.05~-0.10, Support roller 6 / mm: -0.15~-0.20, Support roller 7 / mm: -0.05~-0.10; When the plate type is double quarter wave: Support roller 1 / mm: -0.05~-0.10, Support roller 2 / mm: -0.15~-0.20, Support roller 3 / mm: -0.05~-0.10, Support roller 4 / mm: -0.00~-0.05, Support roller 5 / mm: -0.05~-0.10, Support roller 6 / mm: -0.15~-0.20, Support roller 7 / mm: -0.05~-0.10.

[0008] The beneficial effects of this invention are: by adjusting the inlet gap, elongation, and height of the 7 sets of support rollers, this invention effectively solves the problem of quarter wave. Using the parameters of this invention, the wave height / wave length after quarter wave straightening of S31254 stainless steel precision thin strip can be ≤3IU. Attached Figure Description

[0009] The present invention will now be further described with reference to the accompanying drawings.

[0010] Figure 1 This is a schematic diagram of the structure of the quarter-wave manipulation method of the present invention.

[0011] Figure 2 This is a schematic diagram of the structure of the quarter-wave transmission method of the present invention.

[0012] Figure 3 This is a schematic diagram of the double quarter wave structure of the present invention.

[0013] The arrow indicates the rolling direction. Detailed Implementation

[0014] The technology of this invention is implemented on the German B+S straightening machine, and the technical solution path is as follows: roll-up - threading - take-up - straightening.

[0015] Volume 1

[0016] S31254 stainless steel coils with a thickness of less than 0.1mm are loaded onto the uncoiler of the tension leveling equipment, and the uncoiling tension is set to 2.5~2.9KN.

[0017] Threading

[0018] The feeding trolley clamps the belt head and pulls the strip through the brake tension roller, oiling device, tension measuring device, straightener and tensioning device. To avoid pull-out or belt breakage during the belt threading process, the belt threading speed is set at 5~8m / min.

[0019] Roll

[0020] The strip end is wound onto the winding machine of the tension leveling equipment, and the winding tension is set to 2.9~3.3KN.

[0021] Straightening

[0022] The straightening process is divided into three dimensions: X—the direction of steel strip movement, Y—perpendicular to the direction of steel strip movement, and Z—the width direction of the steel strip. The specific implementation method is as follows.

[0023] X—Steel strip running direction

[0024] The straightening of the steel strip in the running direction mainly relies on the tensile elongation rate, and the tensile elongation rate parameter range of this scheme is 2%~3%.

[0025] Y—Vertical direction of steel strip movement

[0026] The straightening process in the direction perpendicular to the running direction of the steel strip mainly relies on the inlet gap of the straightening roller box. The parameter range of this scheme is -3~-3.5mm.

[0027] Z—Steel strip width direction

[0028] Straightening of the steel strip in the width direction mainly relies on seven sets of independent support rollers located in the lower roller box. Above the support rollers are intermediate rollers, and above the intermediate rollers are the work rollers. The seven sets of support rollers divide the work rollers into seven control units, and the height is adjusted hydraulically to cause slight deformation of the work rollers, thereby achieving straightening of the steel strip in the width direction.

[0029] Different control parameters are given for different types of quarter waves as follows.

[0030]

[0031] Using the parameters of this solution, the wave height / wave length after quarter-wave straightening of S31254 stainless steel precision thin strip can be ≤3IU. Example 1

[0032] Stainless steel coils of grade S31254 with a thickness of 0.05mm and a hardness of HV150-180 are selected. The incoming plate type is a. one-quarter wave with a wave height / wave length of 15IU.

[0033] Volume 1

[0034] S31254 stainless steel coils with a thickness of less than 0.05mm are loaded onto the uncoiler of the tension leveling equipment, and the uncoiling tension is set to 2.6KN.

[0035] II. Threading

[0036] The feeding trolley clamps the belt head and pulls the strip through the brake tension roller, oiling device, tension measuring device, straightener and tensioning device. To avoid pull-out or belt breakage during the belt threading process, the belt threading speed is set at 7m / min.

[0037] III. Winding

[0038] The strip end is wound onto the winding machine of the tension leveling equipment, and the winding tension is set to 3.0KN.

[0039] IV. Straightening

[0040] The process parameters are given as follows: elongation 3.2%, inlet gap -3.1mm.

[0041]

[0042] Products manufactured using the above process have a wave height / wave length of 2 IU after straightening, which meets the usage requirements. Example 2

[0043] Stainless steel coils of grade S31254 with a thickness of 0.03mm and a hardness of HV200-240 are selected. The incoming plate type is c. double quarter wave with a wave height / wave length of 20IU.

[0044] Volume 1

[0045] S31254 stainless steel coils with a thickness of less than 0.03mm are loaded onto the uncoiler of the tension leveling equipment, and the uncoiling tension is set to 2.8KN.

[0046] II. Threading

[0047] The feeding trolley clamps the belt head and pulls the strip through the brake tension roller, oiling device, tension measuring device, straightener and tensioning device. To avoid pull-out or belt breakage during the belt threading process, the belt threading speed is set at 6m / min.

[0048] III. Winding

[0049] The strip end is wound onto the winding machine of the tension leveling equipment, and the winding tension is set to 3.2KN.

[0050] IV. Straightening

[0051] The process parameters are given as follows: elongation 3.4%, inlet gap -3.4mm.

[0052]

[0053] Products manufactured using the above process have a wave height / wave length of 2.5 IU after straightening, which meets the usage requirements.

[0054] It should be emphasized that the above-described production method is for illustrative purposes only and is not intended to limit the scope of the invention. Furthermore, after reading the teachings of this invention, those skilled in the art can make various modifications or alterations to the invention, but these equivalent forms also fall within the scope defined by the appended claims.

[0055] The above description is only a specific embodiment of the present invention, but the structural features protected by the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A straightening process for S31254 stainless steel thin strip, characterized in that: The process includes the following steps: Step 1: Coiling: Place the S31254 stainless steel coil with a thickness of less than 0.1mm onto the uncoiler of the tension leveling equipment, and set the uncoiling tension to 2.5~2.9KN; Step 2: Threading: Use the feeding trolley to clamp the belt head and pull the strip through the brake tension roller, oiling device, tension measuring device, straightener and tensioning device. The threading speed is set to 5~8m / min. Step 3: Winding: Wind the passed-through strip head onto the winding machine of the tension leveling equipment, with the winding tension set to 2.9-3.3KN; Step 4: Straightening: The straightening process is divided into three dimensions: X—steel strip running direction, Y—perpendicular to the steel strip running direction, and Z—steel strip width direction. The specific implementation methods are as follows: X—steel strip running direction: The straightening process in the steel strip running direction relies on the tensile elongation rate, with a range of 2%~3%; Y—perpendicular to the steel strip running direction: The straightening process in the perpendicular to the steel strip running direction relies on the inlet gap of the tensile roller box, with a range of -3~-3.5mm; Z—steel strip width direction: The straightening in the steel strip width direction relies on seven sets of independent support rollers located in the lower roller box. Above the support rollers are intermediate rollers, and above the intermediate rollers are work rollers. The seven sets of support rollers divide the work rollers into seven control units, and the height is adjusted hydraulically to achieve straightening in the steel strip width direction. The specific implementation parameters for the seven sets of support rollers in the Z-direction of the steel strip width in step four are as follows: When the plate type is a quarter-wave on the control side: support roller 1 / mm: -0.05~-0.10, support roller 2 / mm: -0.15~-0.20, support roller 3 / mm: -0.05~-0.10, support roller 4 / mm: -0.00~-0.03, support roller 5 / mm: -0.00~-0.03, support roller 6 / mm: -0.00~-0.03, support roller 7 / mm: -0.00~-0.03; When the plate type is a quarter-wave on the transmission side: support roller 1 / mm: -0.00~-0.03, support roller 2 / mm: -0.00~-0.03, support roller 3 / mm: - 0.00~-0.03, Support roller 4 / mm: -0.00~-0.03, Support roller 5 / mm: -0.05~-0.10, Support roller 6 / mm: -0.15~-0.20, Support roller 7 / mm: -0.05~-0.10; When the plate type is double quarter wave: Support roller 1 / mm: -0.05~-0.10, Support roller 2 / mm: -0.15~-0.20, Support roller 3 / mm: -0.05~-0.10, Support roller 4 / mm: -0.00~-0.05, Support roller 5 / mm: -0.05~-0.10, Support roller 6 / mm: -0.15~-0.20, Support roller 7 / mm: -0.05~-0.10.

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