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Ferritic stainless steel strip excellent in freeze of shape formed by working

A stainless steel plate, ferrite technology, applied in the field of manufacturing the steel plate, can solve the problems of high Ni content in austenitic stainless steel

Inactive Publication Date: 2006-04-05
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, austenitic stainless steels are expensive materials due to the high Ni content

Method used

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  • Ferritic stainless steel strip excellent in freeze of shape formed by working
  • Ferritic stainless steel strip excellent in freeze of shape formed by working
  • Ferritic stainless steel strip excellent in freeze of shape formed by working

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Embodiment Construction

[0012] The properties of ferritic stainless steel basically depend on the chemical composition and manufacturing conditions. The present inventors have studied and examined the effects of chemical composition and manufacturing conditions on properties, and found that shape solidification (in other words, suppression of deformation by springback after forming) is improved by combining specific alloying compositions and manufacturing conditions.

[0013] Since the shape solidification is affected not only by uniaxial deformation but also by multiaxial deformation when the steel plate is plastically formed into a product shape, the material properties and anisotropy along different directions have a great effect on the shape solidification. In particular, the deviations in Lankford value (r) and 0.2% yield strength along the L, D, and T directions are major factors. When the deviation of the Lankford value (r) along the L, D and T directions is small, the stainless steel plate ha...

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Abstract

A ferritic stainless steel sheet, which is press-formed to a product shape without such dimensional defects as spring-back or torsion, has an alloying composition consisting of C up to 0.10%, Si up to 1.0%, Mn up to 1.0%, P up to 0.050%, S up to 0.020%, Ni up to 2.0%, 8.0-22.0% of Cr, N up to 0.05%, optionally one or more of Al up to 0.10%, Mo up to 1.0%, Cu up to 1.0%, 0.010-0.50% of Ti, 0.010-0.50% of Nb, 0.010-0.30% of V, 0.010-0.30% of Zr and 0.0010-0.0100% of B, and the balance being essentially Fe with the provision that a value-FM defined by the formula (1) is adjusted to 0 or less. Its mechanical properties are controlled to a plane anisotropic degree (Gammamax-Gammamin) of Lankford value (Gamma) <=0.80 and an anisotropic degree (Sigmamax-Sigmamin) of 0.2%-yield strength <=20N / mm<2>. The stainless steel sheet is manufactured by hot-rolling a stainless steel having the specified composition and then batch-annealing the hot-rolled steel sheet 1-24 hours at 700-800 DEG C. (FM=420C-11.5Si+7Mn+23Ni-3.5Cr-12Mo+9Cu-49Ti-50Nb-23V-52Al+470N+20).

Description

technical field [0001] The present invention relates to a ferritic stainless steel sheet which can be formed into a product by press forming, roll forming or the like because of having fewer dimensional defects such as springback and torsion and good shape solidification after forming Section steel, and also relates to a method of manufacturing the steel plate. Background technique [0002] Stainless steel sheets have been used in various fields such as internal or external members of buildings, frame members for home appliances, and kitchen items due to their excellent appearance and corrosion resistance. In the present invention, the expression "steel plate" includes steel strips. [0003] Products formed from stainless steel often include dimensional defects during elastic recovery because the elastic strain of stainless steel is greater than that of ordinary steel. For example, when a steel plate that is simply bent into a product shape leaves a forming die, the bendin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/40C22C38/54C21D9/46C21D1/26C21D8/02C21D8/04C22C38/18C22C38/42
CPCC21D8/0205C21D8/0226C21D8/0263C21D8/0405C22C38/001C22C38/004C22C38/18C22C38/40
Inventor 富村宏纪藤本广森本宪一国武保利平松直人
Owner NISSHIN STEEL CO LTD