Ferritic stainless steel sheet causing little orange peel due to working and production method therefor

Abstract

The aim of the invention is to obtain a ferrite series stainless steel plate which has small roughness of machining surface and excellent formability. The task is to provide the ferrite series stainless steel plate with small roughness of machining surface through making the component and structure of steel satisfy an approximate range. Thus the annealing of hot rolled plate is saved for the ferrite series stainless steel plate, and a primary cold rolling with a rolling rate higher than 40% is performed. The intermediate annealing at the temperature of 750-900 DEG C is performed, and a final cold rolling with rolling rate high than 60% and a final annealing at the temperature of 750-1000 DEG C are performed. Therefore the area rate of the [554]+ / -10 DEG oriented crystal grain is more than50%. Additionally, the ferrite series stainless steel casting blank is heated to a temperature range of 1050-1200 DEG C. The starting temperature of hot rough rolling is set to 1000-1150 DEG C. A retention for more than five minutes is performed in hot coarse rolling at the temperature of 900-1100 DEG C. Afterwards, after hot fine rolling is performed, cold rolling-annealing is performed without performing annealing. Therefore the widths of the aligned crystal grains except for the alignment of [554]+ / -10 DEG are smaller than 100 mu m.

Description

technical field [0001] The present invention relates to a ferritic stainless steel plate with small processed surface roughness and a manufacturing method thereof. Background technique [0002] Ferritic stainless steel sheets are used in a wide range of fields such as kitchen equipment, home appliances, and electronic equipment. However, formability is inferior to that of an austenitic stainless steel sheet, and therefore, its use may be limited. In recent years, due to the improvement of refining technology, extremely low carbon nitriding has become possible, and ferritic stainless steel sheets with improved formability and corrosion resistance by adding stabilizing elements such as Ti and Nb are being applied to a wide range of Forming purposes. This is because ferritic stainless steel has good corrosion resistance in indoor environments and is more economical than austenitic stainless steel to which a large amount of Ni is added. [0003] In recent years, Patent Docume...

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Problems solved by technology

[0006] However, the present situation is that medium-Cr ferritic stainless steel sheets (Cr ≥ 16%) commonly used in kitchen equipment, etc., especially ferritic stainless steel sheets that have undergone ultra-low carbon nitriding and added Ti in recent years, are not Ferritic stainless steel plates with small surface roughness that require specified grain size and forming method have not yet appeared.

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