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Effects of Mn and Mo on Microstructures and Properties of High-Strength and Heavy-Gauge Line Pipe Steel

Alloying elements are a determinative factor to line pipe steel properties wherein high strength (X70, X80) and low-temperature toughness for heavy gauge (=19 mm) are desirable. These properties are related to microstructures formed during thermomechanical-controlled processing (TMCP). Here, vacuum induction melting, casting and TMCP by pilot-scale rolling are completed for a reference condition and then compared with two independent increases of Mn and Mo content (i.e., five conditions). Microstructures were assessed using optical and scanning electron microscopy including electron backscattered diffraction while tensile testing and drop weight tear tests were conducted to assess the steels’ properties.
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2025/12 AIST Iron & Steel Technology December
PR-PM1225-4
Michael J. Gaudet, Muhammad Rahman, Peter Poruks, Fateh Fazeli, Muhammad Rashid, Muhammad Arafin
December 01, 2025
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