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The Influence of Post-Weld Heat Treatments (PWHT) upon the Resistance of Ni-Mo and Ni-Cr-Mo alloys to Chloride-Induced Stress Corrosion Cracking, Pitting, and Crevice Attack

Product Number: 51321-16420-SG
Author: Ling Chen/Paul Crook
Publication Date: 2021
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The wrought, nickel-molybdenum (Ni-Mo) and nickel-chromium-molybdenum (Ni-Cr-Mo) alloys are very important materials of construction in the chemical process, pharmaceutical, petrochemical, and oil and gas industries. The objective of this study is to compare the resistance of “as welded” and PWHT samples of several alloys to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion, using standard ASTM test procedures. Commercial alloys HASTELLOY® B-3® (UNS N10675)* , C-22® (UNS N06022)* , C-276 (UNS N10276)* , C-2000 ® (UNS N06200) * , G-35® (UNS N06035)* and HYBRID-BC1® (UNS N10362)* were selected in this study. The gas tungsten arc (GTAW/TIG) welding process was used in sample preparation. The primary conclusion from this study is that no benefit appears to accrue from PWHT regarding resistance to SCC and pitting corrosion. However, there are some distinct advantages of PWHT with regard to crevice attack for UNS N06200, UNS N06035 and UNS N10362 alloys.

Key words: stress corrosion cracking, pitting and crevice corrosion, corrosion resistant alloys, hydrochloric acid, sulfuric acid, sensitization

The wrought, nickel-molybdenum (Ni-Mo) and nickel-chromium-molybdenum (Ni-Cr-Mo) alloys are very important materials of construction in the chemical process, pharmaceutical, petrochemical, and oil and gas industries. The objective of this study is to compare the resistance of “as welded” and PWHT samples of several alloys to chloride-induced stress corrosion cracking (SCC), pitting, and crevice corrosion, using standard ASTM test procedures. Commercial alloys HASTELLOY® B-3® (UNS N10675)* , C-22® (UNS N06022)* , C-276 (UNS N10276)* , C-2000 ® (UNS N06200) * , G-35® (UNS N06035)* and HYBRID-BC1® (UNS N10362)* were selected in this study. The gas tungsten arc (GTAW/TIG) welding process was used in sample preparation. The primary conclusion from this study is that no benefit appears to accrue from PWHT regarding resistance to SCC and pitting corrosion. However, there are some distinct advantages of PWHT with regard to crevice attack for UNS N06200, UNS N06035 and UNS N10362 alloys.

Key words: stress corrosion cracking, pitting and crevice corrosion, corrosion resistant alloys, hydrochloric acid, sulfuric acid, sensitization

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