Search
Filters
Close

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

A New, Highly Stable Corrosion Resistant Alloy For Severe Oil & Gas And CPI Environments

Product Number: 51321-16555-SG
Author: David S. Bergstrom/ Nacéra Sabrina Meck/ John J. Dunn
Publication Date: 2021
$0.00
$20.00
$20.00

ATI has developed ATI 642™† alloy, a new Ni-Cr-Mo corrosion-resistant alloy that displays significant resistance to sensitization from the effects of hot-clad bonding and welding operations. The new alloy is unique because of its substantial Fe content, which gives it a significant cost advantage over Ni-based alloys of similar performance, while still containing enough Ni to provide SCC resistance superior to 6Mo stainless steels. It has a PREN value in excess of 40, which provides useful resistance to chloride environments such as seawater. This paper will present the results of chloride stress-corrosion cracking (SCC), intergranular attack (IGA), and critical pitting temperature (CPT) corrosion tests, as well as results of tensile tests and Charpy impact energy tests. Testing was conducted in both the solution-annealed condition and following a sensitizing heat treatment that simulates typical exposure during the hot-clad bonding fabrication process. The microstructures of the new alloy in the solution-annealed, sensitization-heat-treated, and welded conditions will also be shown and discussed. The test results and microstructures will be compared to those of other alloys traditionally used by the oil and gas and chemical processing industries.

Keywords: Alloy 642, pitting corrosion, stress corrosion cracking, intergranular corrosion, phase stability, weldability, impact energy, clad pipe

ATI has developed ATI 642™† alloy, a new Ni-Cr-Mo corrosion-resistant alloy that displays significant resistance to sensitization from the effects of hot-clad bonding and welding operations. The new alloy is unique because of its substantial Fe content, which gives it a significant cost advantage over Ni-based alloys of similar performance, while still containing enough Ni to provide SCC resistance superior to 6Mo stainless steels. It has a PREN value in excess of 40, which provides useful resistance to chloride environments such as seawater. This paper will present the results of chloride stress-corrosion cracking (SCC), intergranular attack (IGA), and critical pitting temperature (CPT) corrosion tests, as well as results of tensile tests and Charpy impact energy tests. Testing was conducted in both the solution-annealed condition and following a sensitizing heat treatment that simulates typical exposure during the hot-clad bonding fabrication process. The microstructures of the new alloy in the solution-annealed, sensitization-heat-treated, and welded conditions will also be shown and discussed. The test results and microstructures will be compared to those of other alloys traditionally used by the oil and gas and chemical processing industries.

Keywords: Alloy 642, pitting corrosion, stress corrosion cracking, intergranular corrosion, phase stability, weldability, impact energy, clad pipe

Also Purchased
Picture for 08084 A New High Strength Corrosion Resistant Alloy for Oil and Gas Applications
Available for download

08084 A New High Strength Corrosion Resistant Alloy for Oil and Gas Applications

Product Number: 51300-08084-SG
ISBN: 08084 2008 CP
Author: Sarwan K. Mannan and Shaelesh Patel
Publication Date: 2008
$20.00
Picture for 08190 Corrosion Characteristics of a Uniquely Versatile Nickel Alloy
Available for download

08190 Corrosion Characteristics of a Uniquely Versatile Nickel Alloy

Product Number: 51300-08190-SG
ISBN: 08190 2008 CP
Author: Paul Crook and Nacera Sabrina Meck
Publication Date: 2008
$20.00
Picture for 10336 A New Corrosion-Resistant NI-MO-CR Alloy for the Most Versatile Environments
Available for download

10336 A New Corrosion-Resistant NI-MO-CR Alloy for the Most Versatile Environments

Product Number: 51300-10336-SG
ISBN: 10336 2010 CP
Author: Nacéra Sabrina Meck, P. Crook and P. E. Manning
Publication Date: 2010
$20.00