Investigations of Welding Parameters Impacts on Mechanical & Corrosion Behavior of Steel Welds
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Abstract
Now days while the welded product of duplex stainless steels (DSS) is to be used for Cl- containing environment & sour service applications for example petrochemical, off-shore platforms, oil, gas, paper & pulp industries etc. The resistance to chloride stress corrosion cracking (CSCC) during service application has always been a threat for the manufacturer & the end user of the product. Resistance regards SCC under chloride existing environment based on current ferrite content under carefully welded duplex (ferrite-austenitic) stainless steel framework. DSS ferrite specifications required by various organizations are 30 to 60%, 30 to 70 Ferrite Number, 35 to 75%, etc. In this study, DSS 2205 material all weld metal consumable test coupons within ferrite content range 14% to 30% or 20 FN to 40 FN have been prepared & investigated. Investigations have shown that yield strength & tensile strength needs regards base metal & filler metal classifications was higher at every ferrite levels observations & no SCC cracking analysed after 1000 hours exposure at ferrite level below 15%.
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