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08256 Localized Corrosion of a Super-Austenitic Stainless Steel (Fe-24Ni-20Cr-6.3Mo-0.22N) Brazed with a Ni-based braze (Ni-22Cr-6.3Si-3.8P): Effect of Braze Clearance on Corrosion Resistance

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  • 08256 Localized Corrosion of a Super-Austenitic Stainless Steel (Fe-24Ni-20Cr-6.3Mo-0.22N) Brazed with a Ni-based braze (Ni-22Cr-6.3Si-3.8P): Effect of Braze Clearance on Corrosion Resistance
Picture for 08256 Localized Corrosion of a Super-Austenitic Stainless Steel (Fe-24Ni-20Cr-6.3Mo-0.22N) Brazed wi
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Product Number: 51300-08256-SG
ISBN: 08256 2008 CP
Author: Joshua James, John Scully, and Jim Fitz-Gerald
Publication Date: 2008
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The microstructural and local corrosion characteristics of a super-austenitic stainless steel (SASS), (Fe-24Ni-20.5Cr-6.3Mo-0.22N, UNS N08367), brazed with a commercially available Ni-based filler alloy, (Ni-22Cr-6.5Si-3.5P) are investigated. The isolated SASS base material is intrinsically resistant to pitting and crevice corrosion in 0.6 M NaCl solution at room temperature. Isolated braze alloy, tested as a bead prepared at 1150 °C for 60 minutes in a vacuum furnace, without the diffusive egress of melting point depressants (MPDs) exhibited critical potentials for localized corrosion in 0.6 M NaCl well below that of the SASS. This is due to both the low pitting resistance equivalency number (PREN) of the Ni-Cr solid solution and the loss of beneficial Cr due to formation of silicide and phosphide phases, enabled by the presence of these MPDs.
The microstructural and local corrosion characteristics of a super-austenitic stainless steel (SASS), (Fe-24Ni-20.5Cr-6.3Mo-0.22N, UNS N08367), brazed with a commercially available Ni-based filler alloy, (Ni-22Cr-6.5Si-3.5P) are investigated. The isolated SASS base material is intrinsically resistant to pitting and crevice corrosion in 0.6 M NaCl solution at room temperature. Isolated braze alloy, tested as a bead prepared at 1150 °C for 60 minutes in a vacuum furnace, without the diffusive egress of melting point depressants (MPDs) exhibited critical potentials for localized corrosion in 0.6 M NaCl well below that of the SASS. This is due to both the low pitting resistance equivalency number (PREN) of the Ni-Cr solid solution and the loss of beneficial Cr due to formation of silicide and phosphide phases, enabled by the presence of these MPDs.
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Picture for 08257 Corrosion of A Super-Austenitic Stainless Steel (Fe-24Ni-20Cr-6.3Mo-0.22N) When Brazed with a
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08257 Corrosion of A Super-Austenitic Stainless Steel (Fe-24Ni-20Cr-6.3Mo-0.22N) When Brazed with a Ni-Cr Braze Material (Ni-22Cr-6.3Si-3.8P): Corrosion Behavior of Isolated and Combined Materials

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ISBN: 08257 2008 CP
Author: Sara Hebb, Joshua James, Jim Gerald, George Young, and John Scully
Publication Date: 2008
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08237 Corrosion Resistance of Si and Al Bearing Ultrafine Grained Weathering Steel in the Saline Atmosphere

Product Number: 51300-08237-SG
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08248 Crevice Corrosion Evaluation of UNS N08367 Welds Applied by Different Welding Techniques

Product Number: 51300-08248-SG
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