The future demand for high-grade pipeline materials (API X80 and higher) calls for the development of steels with microstructures showing acicular phases. A systematic investigation has been made of the mechanical properties and microstructures exhibited by a wide range of controlled-rolled plates (of final thickness 18 mm) of various chemical composition, produced on a laboratory scale. Low-carbon (about 0.06% C) boron-free and boron-containing steels have been examined, as has a boron steel with a lower carbon content (0. 02% C).
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