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Ferritic stainless steel and method for producing same

A manufacturing method, stainless steel technology, applied in the manufacture of tools, furnaces, heat treatment equipment, etc., can solve the problems of insufficient recrystallization, low annealing temperature, low productivity, etc., and achieve the effect of excellent formability and sufficient corrosion resistance

Inactive Publication Date: 2016-08-17
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of using a box-type furnace, there is a problem of low productivity as in the above-mentioned Patent Document 1.
In addition, there is no description about the elongation, but when the hot-rolled sheet is annealed in the ferrite single-phase temperature range in the continuous annealing furnace, the recrystallization is insufficient due to the low annealing temperature, which is different from that in the ferrite Compared with the case of case annealing in the single-phase temperature range, the elongation decreases
In addition, in general, ferritic stainless steel as in Patent Document 2 generates grain groups (colony) having similar crystal orientations during casting or hot rolling, and there is a problem that |Δr| becomes large.

Method used

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  • Ferritic stainless steel and method for producing same
  • Ferritic stainless steel and method for producing same

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Experimental program
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Embodiment 1

[0083] Hereinafter, the present invention will be described in detail through examples.

[0084] Stainless steel having the chemical composition shown in Table 1 was cast in a 50 kg small vacuum furnace. These ingots were heated at 1150° C. for 1 hour, and then hot-rolled to obtain 3.5 mm-thick hot-rolled sheets. 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 blasting treatment and descaling by pickling. Further, cold rolling was performed to a thickness of 0.7 mm, followed by annealing of the cold-rolled sheet under the conditions described in Table 2, and then descaling treatment by pickling to obtain a cold-rolled pickled and annealed sheet.

[0085] The following evaluations were performed about the cold-rolled pickling-annealed sheet obtained in this way.

[0086] (1) Evaluation of ductility

[0087] Collect JIS 13B tensile test pieces from the cold-rolled pic...

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Abstract

Provided are: a ferritic stainless steel which has sufficient corrosion resistance and excellent formability; and a method for producing this ferritic stainless steel. The ferritic stainless steel according to the present invention contains, in mass%, 0.005-0.05% of C, 0.02-0.50% of Si, 0.05-1.0% of Mn, 0.04% or less of P, 0.01% or less of S, 15.5-18.0% of Cr, 0.001-0.10% of Al and 0.01-0.06% of N, with the balance made up of Fe and unavoidable impurities. This ferritic stainless steel is configured to satisfy El>=25%, (average r value)>=0.70 and the absolute value of delta r<=0.20.

Description

technical field [0001] The present invention relates to a ferritic stainless steel excellent in formability and a method for producing the same. Background technique [0002] Among ferritic stainless steels, SUS430 (16-18mass%Cr) stipulated in Japanese Industrial Standard JIS G 4305 is used in various fields such as building materials, conveying equipment, home appliances, kitchen utensils, and automobile parts because of its low cost and excellent corrosion resistance. Its scope of application has been continuously expanded in recent years. In order to be suitable for these uses, not only corrosion resistance is required, but also sufficient formability (large elongation (hereinafter, sometimes called "ductility" with large elongation)) and average plastic strain ratio (hereinafter , sometimes referred to as the average r value) is large, and the absolute value of the in-plane anisotropy (in plane anisotropy) of the r value (hereinafter, sometimes referred to as |Δr|) is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/18C22C38/54C21D9/48
CPCC22C38/00C21D6/002C21D8/0426C21D8/0436C21D8/0473C21D9/48C21D2211/005C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/18C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32C22C38/40C22C38/42C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 吉野正崇太田裕树田彩子松原行宏水谷映斗藤泽光幸
Owner JFE STEEL CORP
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