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51316-7595-Effect of Chemistry and Heat Treatment on the Pitting Corrosion Resistance of Three Cast Duplex Stainless

Picture for Effect of Chemistry and Heat Treatment on the Pitting Corrosion Resistance of Three Cast Duplex Stai
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Product Number: 51316-7595-SG
ISBN: 7595 2016 CP
Author: Myrissa Maxfield
Publication Date: 2016
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The effect of chemistry and heat treatment on the pitting corrosion resistance of three duplex stainless steels was determined. Pitting corrosion resistance was determined by mass loss pitting density and critical pitting temperature (CPT). The three chemistries selected for testing were J92205 (baseline) plus two new chemistries with lower and higher cost. Nitrogen chromium nickel and molybdenum were varied in the new alloys. Ferric chloride corrosion tests from a modified ASTM G48 standard were used to determine the CPT of the three chemistries in the as-cast and heat treated conditions. When heat treated at 1200C for 1 hour followed by a water quench the lower and higher cost chemistries had a CPT of 85C while the J92205 had a CPT of 60C. As expected the CPT’s were lower for all chemistries in the as-cast condition. Overall the lower cost chemistry had pitting corrosion resistance comparable to the higher cost chemistry and both new alloys had better pitting corrosion resistance compared to the J92205 chemistry.
The effect of chemistry and heat treatment on the pitting corrosion resistance of three duplex stainless steels was determined. Pitting corrosion resistance was determined by mass loss pitting density and critical pitting temperature (CPT). The three chemistries selected for testing were J92205 (baseline) plus two new chemistries with lower and higher cost. Nitrogen chromium nickel and molybdenum were varied in the new alloys. Ferric chloride corrosion tests from a modified ASTM G48 standard were used to determine the CPT of the three chemistries in the as-cast and heat treated conditions. When heat treated at 1200C for 1 hour followed by a water quench the lower and higher cost chemistries had a CPT of 85C while the J92205 had a CPT of 60C. As expected the CPT’s were lower for all chemistries in the as-cast condition. Overall the lower cost chemistry had pitting corrosion resistance comparable to the higher cost chemistry and both new alloys had better pitting corrosion resistance compared to the J92205 chemistry.
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