Production process suitable for controlling austenite cold-rolled stainless steel surface

Abstract

The invention provides a production process suitable for controlling the surface of austenitic cold-rolled stainless steel, which comprises the following steps of: cogging austenitic stainless steel, rolling a first pass and a second pass by using a working roll with the roughness of 2.0-2.5 microns, and replacing the working roll with the roughness of 2.0-2.5 microns after the austenitic stainless steel is rolled. The cold rolling process has the beneficial effects that through the process innovation, the grinding wheel is improved, the roller roughness is improved, and the raw material roughness defect is obviously improved through optimization of the cold rolling process.

Description

Technical Field

[0001] The invention belongs to the technical field of stainless steel production, and in particular relates to a production process suitable for controlling the surface of austenitic cold-rolled stainless steel. Background Art

[0002] In the production process of cold-rolled stainless steel sheets, the color difference of the strip surface is required to be high, and no obvious color difference is allowed. However, due to the poor dephosphorization effect of hot rolling, some steel coils have elliptical color difference on the strip surface, which cannot be eliminated by conventional cold rolling technology, seriously affecting the physical surface quality of the cold-rolled products.

[0003] The surface roughness abnormal coil has serious surface color difference. The conventional rolling process cannot eliminate the surface color difference defect. The previous conventional treatment process has defect grinding or conventional rough roll rough rolling, but the above two treatment methods have certain disadvantages, as follows:

[0004] If production is carried out after grinding, the defective grinding will have a low yield, which will seriously affect the overall production schedule of subsequent processes and the overall delivery progress. In addition, there may be grinding marks on the surface after grinding, resulting in secondary defects, and the overall efficiency and quality are difficult to guarantee.

[0005] In conventional rough roll rolling, the roughness of the rough roll is generally around 0.5um, which can improve slight roughness. However, in cases of severe surface roughness, the improvement effect is general and there is almost no difference.

[0006] The cold rolling production process of austenitic stainless steel mainly includes: hot-rolled steel coil, hot-rolled steel coil annealing and pickling (including annealing, descaling, shot blasting, pickling), rolling on the rolling mill, cold plate annealing and pickling (including annealing, pickling) leveling, finished product trimming and coil storage, sampling and measurement of the same plate difference detection performance.

[0007] When rolling on a rolling mill, conventional roughness rolls are usually used when the steel coil is opened. The roughness is about 0.2 microns. The corresponding color difference defects cannot be effectively removed when rolling a coil with abnormal surface roughness defects.

[0008] Austenitic stainless steel blooming refers to the process of processing austenitic stainless steel billets into the required shape and size through rolling technology. Specifically, blooming refers to the first plastic processing of steel ingots or continuous casting billets on the blooming mill, billet rolling mill, three-roll mill, forging hammer or hydraulic press, so as to provide billets for various rolling mills to produce finished products.

[0009] Taking the above two reasons into consideration, we seek technological breakthroughs and improvements, continuously improve the roughness of the rolls, and improve the color difference defects on the surface after rolling. Summary of the invention

[0010] In view of this, the present invention aims to propose a production process suitable for controlling the surface of austenitic cold-rolled stainless steel to solve at least one technical problem in the background technology.

[0011] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0012] A production process suitable for controlling the surface of austenitic cold-rolled stainless steel comprises the following steps: the austenitic stainless steel is cobbled on a blooming mill, and the austenitic stainless steel is rolled using a working roll with a roughness of 2.0-2.5 microns for a first pass and a second pass.

[0013] Furthermore, the roughness of the third pass working roll is 0.2-0.3 microns.

[0014] Furthermore, the roughness of the working roll before the end of the finishing pass is 0.2-0.3 microns.

[0015] Furthermore, the austenitic stainless steel is opened to adjust the material specifications of the product, and the total deformation amount is at least 70% reduction rate.

[0016] Furthermore, the grinding wheel used in the blooming mill has a corundum abrasive, a resin as a bonding agent, and a mesh number of 46. While ensuring the surface roughness, the surface spiral pattern is controlled (the control is good).

[0017] Compared with the prior art, the production process for controlling the surface of austenitic cold-rolled stainless steel described in the present invention has the following advantages:

[0018] Through the above process innovations, the focus is on improving the grinding wheel and the roughness of the roller, and the roughness defects of the raw materials are significantly improved through the optimization of the cold rolling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the roughening (before rolling) of the raw material according to Example 1 of the present invention;

[0021] Figure 2 This is a schematic diagram after tying according to Embodiment 1 of the present invention;

[0022] Figure 3 This is a schematic diagram of the roughening (before rolling) of the raw material according to Example 1 of the present invention;

[0023] Figure 4 This is a schematic diagram after tying described in Example 1 of the present invention. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] Example 1

[0027] A production process suitable for controlling the surface of austenitic cold-rolled stainless steel comprises the following steps: the austenitic stainless steel is blanked on a blooming mill (the blooming mill model is ZR22B-54), and the austenitic stainless steel is replaced with a working roll with a roughness of 2.2 microns for the first and second passes.

[0028] In the third pass, the work roll with a roughness of 2.2 microns was replaced after the austenitic stainless steel was rolled, and the roughness of the work roll before the end was 0.25 microns. The total deformation of the austenitic stainless steel was 70% reduction rate. The abrasive of the replacement grinding wheel was corundum, the bonding agent of the grinding wheel was resin, and the mesh number of the grinding wheel was 46 meshes.

[0029] like Figure 1 and Figure 2 As shown in the figure, after the process adjustment, the color difference is significantly improved. Through the above process innovations, the focus is on improving the grinding wheel and the roughness of the roller, and the roughness defects of the raw materials are significantly improved through the optimization of the cold rolling process.

[0030] Comparative Example 1

[0031] A production process suitable for controlling the surface of austenitic cold-rolled stainless steel comprises the following steps: the austenitic stainless steel is cobbled on a blooming mill, and the austenitic stainless steel is rolled using a working roll with a roughness of 0.25 microns for the first and second passes. After rolling the austenitic stainless steel, the working roll with a roughness of 0.25 microns is replaced, the roughness of the working roll in the third pass is 0.25 microns, the roughness of the working roll before the end of the finished pass is 0.25 microns, and the total deformation of the austenitic stainless steel is 70% reduction rate during cobbling. The blooming mill replaces the grinding wheel, the abrasive of the grinding wheel is corundum, the bonding agent of the grinding wheel is resin, and the mesh number of the grinding wheel is 46 meshes.

[0032] like Figure 3-Figure 4 As shown, the surface color difference is serious and cannot meet the conventional cold-rolled surface quality requirements.

[0033] Comparative Example 2

[0034] A production process suitable for controlling the surface of austenitic cold-rolled stainless steel comprises the following steps: austenitic stainless steel is cobbled on a preliminary rolling mill, and the austenitic stainless steel is rolled using a working roll with a roughness of 0.25 microns for the first and second passes. After rolling the austenitic stainless steel, a working roll with a roughness of 0.25 microns is replaced, and the roughness of the working roll in the third pass is 0.25 microns. The roughness of the working roll before the end of the finished pass is 0.25 microns. The total deformation amount during the cobbling of the austenitic stainless steel is 70% of the reduction rate, and the grinding wheel uses the original grinding wheel.

[0035] The surface color difference is serious and cannot meet the conventional cold-rolled surface quality requirements.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process suitable for controlling the surface of austenitic cold-rolled stainless steel, characterized in that: The method comprises the following steps: the austenitic stainless steel is blanked on a primary rolling mill, and the austenitic stainless steel is blanked using a working roll with a roughness of 2.0-2.5 microns for a first pass and a second pass.

2. A production process suitable for controlling the surface of austenitic cold-rolled stainless steel according to claim 1, characterized in that: The roughness of the third pass working roll is 0.2-0.3 microns.

3. A production process suitable for controlling the surface of austenitic cold-rolled stainless steel according to claim 1, characterized in that: A total of 9 rolling passes were performed, and the roughness of the working rolls before the end of the finished pass was 0.2-0.3 microns.

4. A production process suitable for controlling the surface of austenitic cold-rolled stainless steel according to claim 1, characterized in that: The total deformation of austenitic stainless steel during billeting is at least 70% reduction.

5. A production process suitable for controlling the surface of austenitic cold-rolled stainless steel according to claim 1, characterized in that: The abrasive of the grinding wheel used in the primary rolling mill is corundum, the bonding agent of the grinding wheel is resin, and the mesh number of the grinding wheel is 46 meshes.

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