Learn to evaluate, fabricate, and weld duplex stainless steels while preserving their corrosion resistance and mechanical integrity in this self-paced, standards-based module.
Practical guidelines for the fabrication of duplex stainless steels
Full Code
APP0426NI205
Module Type
E-learning
Description
None
What you will learn
• Understand the fundamental metallurgy of duplex stainless steels, including phase balance, alloying elements, and the relationship between composition, processing, and properties.
• Explain the primary corrosion mechanisms affecting duplex stainless steels, such as pitting, crevice corrosion, stress corrosion cracking, and the effects of intermetallic and nitride precipitation.
• Differentiate between lean duplex, standard duplex, super duplex, and hyper duplex stainless steels, and identify their typical applications, performance limits, and relative corrosion resistance.
• Evaluate the influence of fabrication variables—including heat input, cooling rate, welding procedures, forming, machining, and post-fabrication cleaning—on microstructure, toughness, and corrosion resistance.
• Apply recommended fabrication and welding practices to avoid detrimental phases, control ferrite–austenite balance, and ensure acceptable mechanical and corrosion properties in fabricated components.
• Interpret specifications, testing requirements, and quality control measures (such as ASTM A923/A1084, impact testing, and corrosion testing) to verify material condition and fabrication quality.
• Assess service conditions and design requirements to select appropriate duplex stainless steel grades that balance performance, reliability, and lifecycle cost in industrial applications.
Module content
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