Austenitic stainless steel and manufacturing method thereof

Abstract

This method involves a coarse hot rolling step for performing coarse hot rolling after heating a slab manufactured by continuous casting to 1000-1300 DEG C, a finish hot rolling step for performing finish hot rolling on the manufactured steel strip after the coarse hot rolling step, and a cooling step for cooling the steel strip after the finish hot rolling step, wherein in the finish hot rolling step, the draft of the finish hot rolling is greater than or equal to 60%, the roll diameter of the finish hot rolling is greater than or equal to 300 mm, the temperature of the finish hot rolling is 600-1100 DEG C, and the final pass temperature of the finish hot rolling is 600-950 DEG C, and in the cooling step, if the final pass temperature of the finish hot rolling is greater than or equal to 750 DEG C, then the steel strip is cooled at a cooling speed of at least 5 DEG C / s until 750 DEG C.

Description

technical field [0001] The present invention relates to austenitic stainless steel and its manufacturing method. Background technique [0002] Portable electronic devices represented by smartphones have high demands for downsizing, lightening, and improving design. Therefore, in the manufacture of metal exterior members used in them, in order to cope with the processing of complex shapes, the implementation of It is a method of forming by cutting after severe cold forging. Furthermore, depending on the design of the portable electronic device, mirror polishing may be performed after the cutting process. Among them, exterior members of portable electronic devices are required not only to be non-magnetic in order to avoid adverse effects on geomagnetic sensors built in the devices themselves, but also to be high in strength. In addition, since the above-mentioned electronic devices are portable, they are often used in outdoor environments, and the exterior members also need ...

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Problems solved by technology

[0008] The method of manufacturing a stainless steel plate described in Patent Document 1 is a good method for manufacturing non-magnetic and high-strength parts, but has the following problems: the manufacturing process is complicated and costs are required; depending on the shape of the product, the manufactured stainless steel plate cannot be used

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