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09182 Corrosion of Ni-Cr-Mo Weldments on UNS N08367

Picture for 09182 Corrosion of Ni-Cr-Mo Weldments on UNS N08367
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Product Number: 51300-09182-SG
ISBN: 09182 2009 CP
Author: Larry D. Paul
Publication Date: 2009
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$20.00
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There is currently interest in the use of a 6 Mo stainless steel (UNS N08367) for applications on naval vessels. While the base material has good resistance to corrosion in marine environments, the welds are in a non-optimal metallurgical condition. Therefore over-matched filler metals need to be used when welding this 6-Mo stainless steel in order to assure proper corrosion resistance. The importance of weld dilution by the base metal is demonstrated. Two Ni-Cr-Mo alloys (UNS N06022 and N06059) were used to produce welds of various dilution amounts. These were then tested in high chloride environments to evaluate how pitting and crevice corrosion might be affected by changing filler metal and the amount of dilution from the base metal.

KEYWORDS: Crevice corrosion, AL6XN1, UNS N08367, alloy 622, UNS N06022, alloy 59, N06059, marine, welds, weld dilution, ships
There is currently interest in the use of a 6 Mo stainless steel (UNS N08367) for applications on naval vessels. While the base material has good resistance to corrosion in marine environments, the welds are in a non-optimal metallurgical condition. Therefore over-matched filler metals need to be used when welding this 6-Mo stainless steel in order to assure proper corrosion resistance. The importance of weld dilution by the base metal is demonstrated. Two Ni-Cr-Mo alloys (UNS N06022 and N06059) were used to produce welds of various dilution amounts. These were then tested in high chloride environments to evaluate how pitting and crevice corrosion might be affected by changing filler metal and the amount of dilution from the base metal.

KEYWORDS: Crevice corrosion, AL6XN1, UNS N08367, alloy 622, UNS N06022, alloy 59, N06059, marine, welds, weld dilution, ships
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In the present study, corrosion behavior of base metal (BM), all-weld-metal (AWM) and heat-affected-zone (HAZ) samples of C-276 (UNS N10276), C-22 (UNS N06022) and C-2000 (UNS N06200) alloys were evaluated in concentrated hydrochloric (HCl), sulfuric (H2SO4) and nitric acid (HNO3).

 
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