Manufacturing method of five-foot austenitic stainless steel for non-magnetic color-difference-free beer barrel

Abstract

The invention particularly relates to a manufacturing method for five-foot austenitic stainless steel of a non-magnetic and color-difference-free beer barrel. The manufacturing method comprises the following steps that firstly, a steel billet of the austenitic stainless steel is selected as a raw material; 2, the obtained steel billet is sequentially subjected to a hot rolling process, a hot rolled steel coil annealing and pickling process, a cold rolling process, a cold rolling annealing and pickling process and a finishing process, and a 2B surface stainless steel plate strip product is obtained; and thirdly, the 2B surface stainless steel plate strip product in the second step is sequentially subjected to surface color difference, material magnetism detection and performance detection, and the austenitic stainless steel suitable for producing the non-magnetic and color difference-free beer barrel is obtained.

Description

technical field [0001] The invention specifically relates to a method for manufacturing a 5-foot austenitic stainless steel beer keg without magnetism and color difference. Background technique [0002] Austenitic stainless steel is currently the most widely used chromium-nickel stainless steel, of which 304 steel is a typical austenitic stainless steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, it has Good processing performance and weldability, suitable for food processing, storage and transportation, has been widely used in heat exchangers, bellows, household products (tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (Windshield wipers, mufflers, molded products), medical appliances, building materials decoration, ship parts and other products, beer kegs are mainly made of plastic, glass, stainless steel and other materials, among which plastic and glass beer kegs are importan...

AI Technical Summary

Problems solved by technology

[0002] Austenitic stainless steel is currently the most widely used chromium-nickel stainless steel, of which 304 steel is a typical austenitic stainless steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, it has Good processing performance and weldability, suitable for food processing, storage and transportation, has been widely used in heat exchangers, bellows, household products (tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), auto parts (Windshield wipers, mufflers, molded products), medical appliances, building materials decoration, ship parts and other products, beer kegs are mainly made of plastic, glass, stainless steel and other materials, among which plastic and glass beer kegs are important in food safety, service life, There are many disadvantages in transportation safety, which have been gradually replaced by stainless steel. The beer kegs produced by ordinary 304 stainless steel are metastable austenitic stainless steel at room temperature. Cold work hardening phenomenon, the metastable austenite structure transforms into a ferromagnetic martensite structure, and the beer keg products show demagnetization, which not only increases the risk of failure and cracking of the beer keg products due to cold work hardening during use, and affects the service life. The precipitation of iron elements affects the taste of beer. In addition, the color difference and ribbon defects on the surface of beer keg products will still appear after stretching and stamping due to the surface color difference of raw materials, which directly affects the beer keg manufacturing enterprises. , Pickling, passivation effect and work efficiency after welding

[0003] The surface color difference control and beer barrel magnetic index control proposed by the existing patents can no longer fully meet the current international beer barrel industry's demand for high-quality beer barrels. The austenitic stainless steel produced according to the existing technology has technical realization of magnetic indexes, There are gaps in the implementation method and detection. When stretching beer barrel products, there are color differences and uneven color bands between batches. The technical control of color difference and color band defects is relatively simple, and the technology cannot meet the current international standards. The high-quality requirements of the industry's products, the current beer barrels are mainly made of 4-foot austenitic stainless steel, the finished barrel body is small in capacity, and the processing cost is high. Therefore, a non-magnetic, non-color difference, and large capacity suitable for The 5-foot austenitic stainless steel for the production of beer kegs and its manufacturing method have become a technology that the industry urgently needs to solve