CN-122007151-A - Preparation method of 304 stainless steel cold plate used as clean plate

CN122007151ACN 122007151 ACN122007151 ACN 122007151ACN-122007151-A

Abstract

The invention belongs to the technical field of 300 series stainless steel cold plate preparation, and particularly relates to a 304 stainless steel cold plate preparation method used as a clean plate, which comprises the following steps of (1) controlling rolling mill plate shape, namely controlling the deformation rate of a first pass to be less than or equal to 23% and the deformation rate of a last pass to be less than or equal to 10%; the method comprises the steps of controlling the first pass speed to be less than or equal to 300m/min, controlling the last pass speed to be less than or equal to 400m/min, controlling the rolling oil flow rate to be more than or equal to 7000l/min for the first pass, controlling the intermediate pass to be more than or equal to 6000l/min and the last pass to be more than or equal to 4000l/min, controlling the annealing and pickling process of cold-rolled strip steel, controlling the plate temperature to be 1090-1110 ℃, controlling the flattening parameters to be standard, namely, using 40 rolls for an upper roll and 60 rolls for a lower roll, and controlling the withdrawal and straightening elongation to be 1-1.5% by using a pure tension mode. The method meets the surface requirements of clean plates, stabilizes production and improves the product percent of pass by optimizing parameters of rolling mill plate type, cold line annealing, leveling pressure and withdrawal straightening elongation.

Inventors

WU CHENGJIANG
FENG JIE
QU BO
ZHANG YANBING
ZHANG BIN
ZHANG JUWANG

Assignees

山西太钢不锈钢股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260303

Claims (3)

1. The preparation method of the 304 stainless steel cold plate used as the clean plate is characterized by comprising the following specific steps: (1) Rolling mill plate type control Controlling first pass the deformation rate is less than or equal to 23 percent, the deformation rate of the final pass is less than or equal to 10 percent; controlling the first pass speed to be less than or equal to 300m/min and the last pass speed to be less than or equal to 400m/min, controlling the rolling oil flow to be more than or equal to 7000l/min for the first pass, 6000l/min for the middle pass and 4000l/min for the last pass; (2) Cold wire annealing specification The annealing and pickling process of the cold-rolled strip steel is controlled, and the plate temperature is controlled to 1090-1110 ℃; (3) Levelling parameter specification The upper roller uses 40 rollers, and the lower roller uses 60 rollers; (4) Tension leveler control The pure tension mode is used, and the stretching elongation is controlled to be 1-1.5%.
2. The method for preparing a 304 stainless steel cold plate used as a cleaning plate according to claim 1, wherein the heat preservation time required for each millimeter of thickness of the strip steel is 2-2.8 min/mm.
3. The method for producing a 304 stainless steel cold plate for use as a cleaning plate according to claim 1, wherein said (3) further comprises a flattening pressure controlled at 400-500 tons.

Description

Preparation method of 304 stainless steel cold plate used as clean plate Technical Field The invention belongs to the technical field of 300-series stainless steel cold plate preparation, and particularly relates to a preparation method of a 304 stainless steel cold plate used as a clean plate. Background 304 Clean plate contains chromium element, forms compact oxide film on the surface, has smooth and compact surface, almost no pore, prevents corrosive medium invasion, simultaneously cleans blood stain, greasy dirt and even microorganism once wiping, and resists strong acid-base sterilizing water scouring, and because it is usually matched with A-level fireproof core material, the whole achieves incombustible standard, belongs to high fireproof grade, and has a theoretical life of more than 20 years. Because of its outstanding performance, it is widely used in the scenes with high requirements for sanitation, risk of corrosion or need of high cleanliness, mainly comprising: food processing industry, pharmaceutical industry, electronics industry, chemical and corrosive environments, extreme environments, and the like. As a clean plate, the thickness of the plate is 0.35-0.6 mm, the requirements on flatness and surface consistency of the plate surface are very high, the requirements on unevenness of the plate surface are less than or equal to 2mm/m, the vision after processing cannot be distorted and refracted with light, the surface requirements are strict, chromatic aberration cannot be caused, and the requirements bring challenges to the quality control level of production enterprises. The 300 series stainless steel cold plate is rolled by a Senji Mi Ernian roller mill, multi-pass reversible rolling is adopted, the surface requirement of a clean plate is strict, and the production difficulty is extremely high and the product percent of pass is low due to unreasonable control of parameters such as rolling pass, roller number, rolling pressure and the like in the rolling process. Disclosure of Invention The invention aims to provide a preparation method of a 304 stainless steel cold plate used as a clean plate, which solves the problems of great production difficulty and low product qualification rate caused by unreasonable control of parameters such as rolling pass, number of rollers, rolling pressure and the like in the rolling process. In order to achieve the above purpose, the invention adopts the following technical scheme: a preparation method of a 304 stainless steel cold plate used as a clean plate comprises the following specific steps: (1) Rolling mill plate type control Controlling first pass the deformation rate is less than or equal to 23 percent, the deformation rate of the final pass is less than or equal to 10 percent; controlling the first pass speed to be less than or equal to 300m/min and the last pass speed to be less than or equal to 400m/min, controlling the rolling oil flow to be more than or equal to 7000l/min for the first pass, 6000l/min for the middle pass and 4000l/min for the last pass; (2) Cold wire annealing specification The annealing and pickling process of the cold-rolled strip steel is controlled, and the plate temperature is controlled to 1090-1110 ℃; (3) Levelling parameter specification The upper roller uses 40 rollers, and the lower roller uses 60 rollers; (4) Tension leveler control The pure tension mode is used, and the stretching elongation is controlled to be 1-1.5%. Preferably, the heat preservation time required by the thickness of the strip steel per millimeter is 2-2.8 min/mm. Preferably, the (3) further comprises a leveling pressure controlled to be 400-500 tons. Compared with the prior art, the invention has the following beneficial effects: (1) The plate shape control of the rolling mill lays a foundation for the plate shape of the final product, and the qualification level of the plate shape of the final product is effectively improved; (2) Through cold wire annealing specification, the strip steel is ensured to be effectively solid-dissolved, the internal stress is released, the uniformity of tissue performance is improved, and a space is provided for further improvement of the follow-up plate type; (3) The defect of the steel strip that the middle part is ribbed is improved to the greatest extent through the standard of flattening parameters, the flatness of the plate type is maintained, and the surface is uniform and consistent; (4) The plate shape is further improved through withdrawal and straightening control, so that the unevenness of the plate shape meets the requirement; (5) The parameters of rolling mill plate shape, cold line annealing, leveling pressure and withdrawal straightening elongation are optimized, so that the surface requirement of a clean plate is met, stable production is realized, and the product percent of pass is improved. Detailed Description The technical scheme of the invention is described in detail below with reference to exa