Description
Estimated time: 5 hours
Language: English
Summary of the lecture
This course is based on Practical Guidelines for the Fabrication of Duplex Stainless Steels (Third Edition, 2014), published by the International Molybdenum Association (IMOA).
It provides practical, experience-based guidance for fabricators, engineers, inspectors, and end users involved in the specification, fabrication, welding, and quality control of duplex stainless steel products. The publication addresses the unique metallurgical characteristics of duplex stainless steels and explains how composition, phase balance, thermal history, and fabrication practices influence mechanical properties, corrosion resistance, and in-service performance.
The course focuses on fabrication-related topics including forming, machining, welding, heat treatment, and post-fabrication cleanup, with particular emphasis on avoiding detrimental phases and preserving corrosion resistance and toughness. Drawing on industry experience and established standards, it supports informed fabrication and material handling practices that enhance reliability, reduce fabrication-related failures, and ensure consistent performance of duplex stainless steels in demanding applications.
What you will learn:
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- 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.
Course includes
- 1 Lesson
- Steel Applications
