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Ferritic-austenitic stainless steel plate with excellent corrosion resistance at the shear end surface

A technology for austenitic and stainless steel plates, applied in furnaces, heat treatment equipment, manufacturing tools, etc., to achieve corrosion resistance, suppress loss of aesthetics, and improve corrosion resistance

Active Publication Date: 2019-06-11
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The present invention advantageously solves the above-mentioned problems, and aims to provide a ferritic-austenitic stainless steel plate with improved corrosion resistance at the sheared end face for a ferritic-austenitic stainless steel plate used in an atmospheric environment without a corrosion resistance treatment. Body - austenitic stainless steel plate

Method used

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  • Ferritic-austenitic stainless steel plate with excellent corrosion resistance at the shear end surface
  • Ferritic-austenitic stainless steel plate with excellent corrosion resistance at the shear end surface
  • Ferritic-austenitic stainless steel plate with excellent corrosion resistance at the shear end surface

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Embodiment

[0165] Examples of the present invention will be described below, but the conditions in the examples are examples of conditions adopted to confirm the practicability and effects of the present invention, and the present invention is not limited to the conditions used in the following examples. The present invention can adopt various conditions as long as the object of the present invention can be achieved without departing from the requirements of the present invention.

[0166] In addition, the underline in a table|surface shows that it deviates from the range of this embodiment.

[0167] Ferritic-austenitic stainless steels having the chemical compositions shown in Tables 1 and 2 were melted. Then, it was heated to a temperature of 1200° C., and then hot-rolled at a finish rolling temperature of 980° C. to obtain a hot-rolled sheet having a thickness of 4 mm. The rolling reduction of at least one pass in the rough rolling step of hot rolling is set to 30% or more. In addit...

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Abstract

The present invention is directed to a ferrite-austenitic stainless steel plate that is used in an atmospheric environment without corrosion resistance treatment, and provides a ferrite-austenitic stainless steel plate with improved corrosion resistance at the shear end surface. . The ferrite-austenitic stainless steel plate of the present invention contains in mass %: C: 0.03% or less, Si: 0.1 to 1.0%, Mn: 0.5 to 5.0%, P: 0.04% or less, Al: 0.015 to 0.10 %, Cr: 19.0~24.0%, Ni: 0.60~2.30%, Cu: 0.5~1.5%, Co: 0.05~0.25%, V: 0.01~0.15%, Ca: 0.002% or less, N: 0.06~0.20%, and S: 0.0002~0.0040%, the remainder is Fe and inevitable impurities, the value of Co+0.25V is above 0.10 and below 0.25, the metal structure is only composed of ferrite phase and austenite phase, ferrite The average grain diameter of the phase is 5 to 20 μm, the average grain diameter of the austenite phase is 2 to 10 μm, and the sulfide with a long diameter of 1 to 5 μm is measured every 5 mm. 2 It exists in quantities of 5 to 20 pieces.

Description

technical field [0001] The present invention relates to a ferrite-austenite (two-phase system) stainless steel plate having excellent corrosion resistance at a sheared end surface. In particular, the present invention relates to a ferritic-austenitic stainless steel plate suitable for use in an air environment after shearing without performing a corrosion resistance treatment on the sheared end face. [0002] This application claims priority based on Japanese Patent Application No. 2015-065028 for which it applied in Japan on March 26, 2015, and uses the content here. Background technique [0003] Ferritic-austenitic (duplex) stainless steels are used in a wide variety of applications due to their excellent strength and corrosion resistance. It is used in a variety of applications, from products that require little processing, such as solar cell support tables, to products that require strict processing, such as supporting parts such as outdoor piping. [0004] In the prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/58C22C38/60C21D9/46
CPCC21D9/46C22C38/00C22C38/58C22C38/60C22C38/02C22C38/04C22C38/10C22C38/105C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C21D2211/001C21D2211/005C22C38/004C22C38/002
Inventor 石丸咏一朗川真知
Owner NIPPON STEEL STAINLESS STEEL CORP