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Ferritic stainless steel sheet and method for manufacturing same

A technology of stainless steel plate and manufacturing method, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problem that the bulging formability cannot be said, the formability cannot be said, the production corrosion resistance has not yet been established, and the formability and resistance to corrosion Achieve sufficient corrosion resistance against problems such as wrinkled SUS430 series stainless steel plate

Active Publication Date: 2018-02-16
JFE STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Ferritic stainless steel sheet and method for manufacturing same
  • Ferritic stainless steel sheet and method for manufacturing same

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Embodiment 1

[0096] Hereinafter, the present invention will be described in detail by way of examples.

[0097] The stainless steel having the chemical composition shown in Table 1 was melted in a 50 kg small vacuum melting furnace. These steel blocks were heated at 1150° C. for 1 hour, and then hot-rolled to obtain a hot-rolled sheet having a thickness of 3.5 mm. Next, these hot-rolled sheets were subjected to hot-rolled sheet annealing under the conditions described in Table 2, and then the surfaces were subjected to descaling by shot peening and pickling. After further cold rolling to a sheet thickness of 0.8 mm, the cold rolled sheet was annealed under the conditions described in Table 2. Furthermore, the descaling process by pickling was performed, and the cold-rolled pickling annealing sheet (ferritic stainless steel sheet) was obtained.

[0098] The cold-rolled and pickled-annealed sheet (ferritic stainless steel sheet) thus obtained was subjected to the following evaluations.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/40C22C38/54
CPCC22C38/54C21D2211/005C21D9/46C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0236C21D8/0263C21D8/0273C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/004C22C38/40
Inventor 吉野正崇水谷映斗藤泽光幸上力
Owner JFE STEEL CORP
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