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The Influence of Heat Treatment Temperature on Microstructure and Corrosion Behavior of SDSS Tube
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 Title & Authors
The Influence of Heat Treatment Temperature on Microstructure and Corrosion Behavior of SDSS Tube
Lee, Insup; Cheon, Chang-seok; Yim, Tai-Hong; Han, Yoon-Ho; Lee, Myon-Hag;
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 Abstract
The aim of this paper is to determine the proper heat treatment temperature for SDSS tube production without -phase precipitation. When Mother steel tube was heat treated at temperature, relatively a large amount of -phase precipitated and grain refinement of ferrite phase occurred simultaneously. However, in Pilgered and Drawn steel tubes, grain refinement of the ferrite phase did not occur and a small amount of -phase precipitated. For all three types of steel tubes, the pitting potential was reduced to 2/5 or less compared with the untreated one and corrosion also occurred in the salt spray test due to the precipitation of -phase. When heat treatment temperature was , grain refinement of the ferrite phase occurred and very little -phase precipitated in Pilgered and Drawn steel tubes. But when heat treatment was done at temperature, all three types of steel tubes had a similar corrosion properties of that of untreated one and also corrosion did not occur in the salt spray test, as -phase did not precipitate. Therefore, the optimum heat treatment temperature range is determined to be more than for the SDSS at which corrosion does not occur.
 Keywords
-phase precipitation;corrosion resistance;hardness;super duplex stainless steel;
 Language
Korean
 Cited by
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