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Welding Considerations for Stainless Steel Pipe
The increasing prevalence of reverse osmosis treatment water projects which produce aggressive water has led to a commensurate increase in the specification of stainless steel for process piping. Based upon material characteristics alone, stainless steel appears suitable for many of these environments, but neglecting how these piping components are fabricated and attached together can lead to otherwise unexpected corrosion problems. This discussion is intended for application to the austenitic stainless steels, (e.g., UNS S30400, etc.) or more commonly the "300 series." Austenitic stainless steels contain about 18 percent chromium and 8 percent nickel as their principal alloying elements. They are the most common types specified for waterworks because of their normally good resistance to atmospheric corrosion. Austenitic stainless steels resist corrosion because of the passive oxide layer that forms on the surface. They are readily welded, and the welds are generally tough and ductile, if properly made. However, the passive oxide layer is disturbed during the welding of joints. The welding procedure specification, which must be submitted for review by the engineer of record, will usually include the critical variables for ensuring that the properly made weld has adequate strength. What the welding procedure will not include are the techniques necessary to allow the weld and heat-affected zone of the base material to enjoy the same corrosion resistance of the base material. This paper addresses good specification and detailing practices intended to result in corrosion-free stainless steel pipe installations.
Welding Considerations for Stainless Steel Pipe
The increasing prevalence of reverse osmosis treatment water projects which produce aggressive water has led to a commensurate increase in the specification of stainless steel for process piping. Based upon material characteristics alone, stainless steel appears suitable for many of these environments, but neglecting how these piping components are fabricated and attached together can lead to otherwise unexpected corrosion problems. This discussion is intended for application to the austenitic stainless steels, (e.g., UNS S30400, etc.) or more commonly the "300 series." Austenitic stainless steels contain about 18 percent chromium and 8 percent nickel as their principal alloying elements. They are the most common types specified for waterworks because of their normally good resistance to atmospheric corrosion. Austenitic stainless steels resist corrosion because of the passive oxide layer that forms on the surface. They are readily welded, and the welds are generally tough and ductile, if properly made. However, the passive oxide layer is disturbed during the welding of joints. The welding procedure specification, which must be submitted for review by the engineer of record, will usually include the critical variables for ensuring that the properly made weld has adequate strength. What the welding procedure will not include are the techniques necessary to allow the weld and heat-affected zone of the base material to enjoy the same corrosion resistance of the base material. This paper addresses good specification and detailing practices intended to result in corrosion-free stainless steel pipe installations.
Welding Considerations for Stainless Steel Pipe
Romer, Andrew E. (author)
International Pipelines Conference 2008 ; 2008 ; Atlanta, Georgia, United States
Pipelines 2008 ; 1-7
2008-07-17
Conference paper
Electronic Resource
English
Infrastructure , Stainless steel , Welding , Steel pipes , Pipelines , Costs , Assets
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