Austenitic stainless steel for urban rail vehicle face plates and manufacturing method of austenitic stainless steel

Abstract

The invention discloses austenitic stainless steel for urban rail vehicle face plates and a manufacturing method of the austenitic stainless steel. The austenitic stainless steel comprises the following chemical compositions inpercentage by weight: less than 0.03% of C, 0.75-1.0% of Si, 6.5-8.0% of Mn, 16.0-17.5% of Cr, 3.0-4.5% of Ni, 0.15-0.25% of N, 0.5-1.0% of Cu, 0.02-0.05% of Ce, no greater than 0.040% of P, no greater than 0.03% of S, and the balance of Fe and inevitable impurities; the manufacturing method of the austenitic stainless steel comprises the following steps: through the operations of smelting, continuous casting, refining, tombarthite mixture block feeding, and soft stirring, continuous casting slabs are obtained by continuous casting, and the continuous casting slabs are heated; after hot rolling, cooling, reeling, air cooling, solution treating, shot blasting, acid cleaning, cold rolling and annealing acid cleaning are conducted, the finished product austenitic stainless steel is manufactured. According to the austenitic stainless steel for the urban rail vehicle face plates and the manufacturing method of the austenitic stainless steel, the oxidation of the edge part grain boundary caused by overheating of the slab edge part can be avoided; in the process of heating, a layer of dense chromium oxidation film with high adhesion is formed on the surface, the surface quality of the continuous casting slabs is protected, and the guarantee about surface quality control of stainless steel material used for the urban rail vehicle face plates can be provided.

Description

technical field [0001] The invention relates to austenitic stainless steel and a manufacturing method thereof, in particular to austenitic stainless steel for panels of urban rail vehicles and a manufacturing method thereof, which is suitable for manufacturing panels of urban rail vehicles or passenger trains. Background technique [0002] With the rapid development of domestic urban rail transit, more than 40 cities have built or are building urban rail transit. Stainless steel urban rail vehicles are more and more popular because of their advantages such as long life cycle, low cost, fire prevention and beautiful appearance. [0003] At present, the materials used to manufacture stainless steel urban rail vehicles at home and abroad are mostly 00Cr17Ni7 metastable austenitic stainless steel. The Japanese standard of this type of stainless steel is SUS301L, and the European standard is EN1.4318. The chemical composition is shown in Table 1. [0004] Table 1. Composition co...

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Problems solved by technology

[0008] ① Due to the fluctuation of chemical composition, the performance fluctuation after quenching and tempering rolling, that is, the instability of the final product performance;

[0009] ②Compared with carbon steel, stainless steel has stronger oxidation resistance, and the defect parts are easy to develop to the depth during heating and the whole hot rolling process, especially when the edge temperature of the slab is too high, it is easy to oxidize the grain boundary, resulting in the deterioration of the surface quality of the product. downgrade

However, the precious metal Ni content is as high as 6.9-7.4%, resulting in higher production costs

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