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Duplex stainless steel material for vacuum vessels, and process for manufacturing same

A duplex stainless steel, an unavoidable technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., to achieve excellent gas release characteristics and excellent strength

Active Publication Date: 2012-11-07
NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, it became clear that there is a new problem that hydrogen release from steel is promoted by cold working

Method used

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  • Duplex stainless steel material for vacuum vessels, and process for manufacturing same
  • Duplex stainless steel material for vacuum vessels, and process for manufacturing same
  • Duplex stainless steel material for vacuum vessels, and process for manufacturing same

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Embodiment

[0064] The present invention will be described more specifically by way of examples below. Table 1 shows the chemical composition of the tested steels. In addition, components other than those described in Table 1 are Fe and unavoidable impurity elements. In addition, with respect to the components shown in Table 1, the part where the content is not described shows the impurity level. In addition, REM in a table|surface means a lanthanide rare earth element, and content shows the total of those elements.

[0065] The steel billet of steel type number T is produced from the actual machine melting slab, and the steel billet with a thickness of 80 mm is used as a hot rolling billet. The steels with steel grade numbers A to Q are smelted in a 50kg vacuum induction furnace in the laboratory, and the steels of R are smelted in a 50kg atmospheric melting furnace, cast into flat steel blocks with a thickness of about 110mm, and then made into 80mm thick steel blocks by hot forging. ...

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Abstract

Provided is an Ni-saving type duplex stainless steel material which exhibits excellent gas desorption characteristics and can substitute for austenitic stainless steel. The duplex stainless steel material is characterized by: containing, by mass, 0.06% or less of C, 0.05 to 1.5% of Si, 0.5 to 10.0% of Mn, 0.05% or less of P, 0.010% or less of S, 0.1 to 5.0% of Ni, 18.0 to 25.0% of Cr, 0.05 to 0.30% of N, and 0.001 to 0.05% of Al; and having a hydrogen content of 3ppm or less, the balance being Fe and unavoidable impurities.

Description

technical field [0001] The present invention relates to an inexpensive Ni-saving duplex stainless steel material excellent in gas desorption properties for vacuum containers and a method for producing the same. Background technique [0002] The production of semiconductor elements, liquid crystal panels, and thin-film solar cells has increased rapidly in recent years, and there is a tendency to increase the size of products. The manufacture of these products requires a vacuum process, and metal materials such as stainless steel, aluminum, and titanium are used as vacuum containers. As the stainless steel of the vacuum container, austenitic materials represented by SUS304 steel have been used conventionally. In addition, with the increase in size of vacuum equipment, thicker stainless steel materials with a plate thickness of up to about 80 mm have been used. [0003] As the characteristic required for the material for a vacuum container, low gas emission is mentioned. Esp...

Claims

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Application Information

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IPC IPC(8): C22C38/58C21D6/00
CPCC22C38/06C22C38/02C21D6/005C22C38/58C21D9/08C21D2211/005C21D9/14C21D2211/001C21D6/004C22C38/001C21D6/00
Inventor 柘植信二梶村治彦山本洋一井上裕滋
Owner NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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