Ferritic stainless steel sheet and method for manufacturing same

Abstract

Provided are a ferritic stainless steel sheet having adequate corrosion resistance and excellent forming properties and ridging resistance, and a method for manufacturing the same. This ferritic stainless steel sheet contains, in terms of % by mass, 0.005-0.025% C, 0.02-0.50% Si, 0.55-1.00% Mn, 0.04% or less of P, 0.01% or less of S, 0.001-0.10% Al, 15.5-18.0% Cr, 0.1-1.0% Ni, and 0.005-0.025% N,the remainder comprising Fe and unavoidable impurities, the breaking elongation of the ferritic stainless steel sheet being 28% or greater, the average r value thereof being 0.75 or greater, and the minimum value of the maximum logarithmic strain of the forming limit based on a forming limit diagram (FLD) being 0.15 or greater.

Description

technical field [0001] The present invention relates to a ferritic stainless steel sheet having sufficient corrosion resistance and excellent formability and wrinkle resistance, and a method for producing the same. Background technique [0002] Ferritic stainless steel sheets are more economical than austenitic stainless steels containing a large amount of expensive Ni. Among ferritic stainless steels, SUS430 series stainless steel sheets (16 to 18 mass% Cr) in particular are economical, and are therefore used in various applications such as building materials, transportation equipment, home appliances, kitchen appliances, and automobile parts. The scope has further expanded in recent years. In order to apply to these applications, not only corrosion resistance but also sufficient formability that can be processed into a predetermined shape is required. [0003] On the other hand, SUS430-series stainless steel sheets are often used in applications requiring good appearance...

AI Technical Summary

Problems solved by technology

However, the inventors of the present invention manufactured steel sheets by the method described in Patent Document 3 and attempted to manufacture ventilator covers mainly by bulging forming, and as a result, found that cracks occurred sporadically during the pressing process, preventing forming into a predetermined shape. In some cases, the bulging formability expected from the elongation at break may not be exhibited

It can be seen that although the ferritic stainless steel sheet described in Patent Document 3 has a high elongation at break in the tensile test, it cannot sufficiently exhibit the bulging formability required in press forming, and it cannot be said that it is obtained. Sufficient moldability that is the subject of the present invention

[0007] As mentioned above, the technology for producing SUS430 series stainless steel sheet with sufficient corrosion resistance and excellent formability and wrinkle resistance has not yet been established

Images