A Duplex Stainless Steel for Chloride Environments

Abstract

SUMMARY

Microstructural Evolution during Industrial Rolling of a Duplex Stainless Steel

“…for marine constructions, ships' outer skins, pipelines and power plants. [6][7][8][9] DSS are mainly used in form of flat products but cast structures for e.g. off-shore applications exist as well.…”

Effects of Nitrogen on the Selective Dissolution of a Duplex Stainless Steel

“…4,5 In Iow-N duplex SSs, corrosion in these solutions seems to initiate first in the base-metal and HAZ before it spreads to the weid metal ( Figure 8). It is also apparent that low-N alloys corrode more severely.…”

Development of Large, Nickel-Based Alloy 925 Composite-Block Trees for Extreme-Corrosion, Fire-Resistant Applications on Offshore Platforms

“…The formation of either of these phases can result in Charpy V-notch impact strengths below 10 ftlbf [13 .6 J] at room temperature. 3,4 Because the maximum design temperature for fire-resistant equipment is above the temperature range where alpha prime forms , the use of duplex stainless steels is not recommended for this application.…”

“…8 show the drop in impact strength that occurs in Alloy 925 as a result of sigma-phase formation. When this isothermal time/temperature curve is compared with data for duplexstainless UNS S32550 or duplex-stainless Z6CNDU20.08M, 3 NF A 320-55 French Natl. Standard,2 it is obvious that the rate of sigma-phase formation is much slower in Alloy 925 than in duplex stainless steels.…”