High strength (560 MPa) quenched and tempered pipeline steels

Abstract We describe here the feasibility of processing high strength 560 MPa (X80) pipeline steels by the quenching and tempering (QT) process. The attributes of the QT process include the elimination of banded duplex phase microstructure of pipeline steel obtained by thermomechanical controlled process, uniformity of microstructure across the thickness of plate and desired bainite phase. Increasing the quenching temperature from 890 to 930°C did not significantly influence the ultimate microstructure and mechanical properties of pipeline steel. When the tempering temperature was increased from 400 to 550°C, a high density of fine precipitates of niobium carbides and/or nitrides of size less than 10 nm were precipitated, with a consequent increase in the yield strength and yield ratio. Ferrous carbides decomposed from retained austenite decreased the continuity of ferrite phase, which resulted in lower tensile strength and a higher yield ratio.

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