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Ferritic stainless steel and method for producing same

A manufacturing method and stainless steel technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of low productivity, insufficient recrystallization, and enlargement, and achieve the effect of small linear defects.

Active Publication Date: 2016-08-31
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, Patent Document 2 does not describe elongation at all, but when hot-rolled sheet annealing is performed in a ferrite single-phase temperature range in a continuous annealing furnace, recrystallization is insufficient due to low annealing temperature. Compared with the case of box annealing in the ferrite single-phase temperature range, the elongation is lower
In addition, in general, ferritic stainless steels such as Patent Document 2 generate 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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Embodiment 1

[0093] Hereinafter, the present invention will be described in detail through examples.

[0094] Stainless steel having the chemical composition shown in Table 1 was cast in a 50 kg small vacuum furnace. These billets 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. Pickling means immersing for 120 seconds in a 20% by mass sulfuric acid solution at a temperature of 80°C, and then immersing for 60 seconds in a mixed acid solution at a temperature of 55°C consisting of 15% by mass of nitric acid and 3% by mass of hydrofluoric acid. Further, by cold rolling into a thickness of 0.7mm and annealing the cold-rolled sheet under the conditions recorded in Table 2, and then by 2 SO 4 In aqueous solution at 25C / dm 2 Electrolytic pickl...

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Abstract

Provided are: a ferritic stainless steel which has sufficient corrosion resistance and formability (large elongation and average r value, and small |[delta]r|), while being suppressed in the occurrence of linear streaks and having excellent surface properties; and a method for producing this ferritic stainless steel. A 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, 0.01-0.06% of N, 0.01-0.25% of V, 0.001-0.020% of Ti and 0.001-0.030% of Nb, with the balance made up of Fe and unavoidable impurities. In addition, this ferritic stainless steel is configured to satisfy V / (Ti+Nb)>=2.0.

Description

technical field [0001] The present invention relates to a ferritic stainless steel having sufficient corrosion resistance and formability, excellent surface properties without occurrence of linear defects caused by hot rolling and annealing, and a method for producing the same. Background technique [0002] Ferritic stainless steel is inexpensive and has excellent corrosion resistance, so it is used in a variety of applications such as building materials, transportation equipment, home appliances, kitchen utensils, and automotive parts, and its application range has continued to expand in recent years. In order to be used in these applications, ferritic stainless steel requires not only corrosion resistance, but also sufficient formability (a large elongation rate (hereinafter, a sufficiently large elongation rate is referred to as having ductility) to be able to be processed into a predetermined shape. ), the average plastic strain ratio (hereinafter referred to as the aver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/28C22C38/54C21D9/48
CPCC21D6/004C21D8/0205C21D8/0226C21D8/0236C21D8/0263C21D8/0273C21D9/48C21D2211/005C22C38/00C22C38/001C22C38/002C22C38/004C22C38/005C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54
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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