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Through-Thickness Austenite and Niobium Precipitation Evolution Developed During Hot Rolling Contribution to HAZ Ductility Performance in Structural Steel and API Welds

Knowledge from the contribution to ductility performance from the throughthickness as-rolled austenite grain size/homogeneity and niobium precipitate evolution in normalized/quench-and-tempered steels has been applied to the heat-affected zone (HAZ) ductility performance of API and structural steel welds. The through-thickness austenite grain size/homogeneity and Nb precipitation evolution developed during hot rolling has been observed to be beneficial to influencing the HAZ grain size and microstructure to peak welding temperature. This has resulted in stable and enhanced ductility performance of the HAZ in various applications such as API pipeline steels for natural gas or H2 transmission.
Product:
2025/11 AIST Iron & Steel Technology November
PR-PM1125-3
Douglas Stalheim, David Martin, Aaron Litschewski, Greg Ebel. Pello Uranga
November 01, 2025
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