Effects of Ultra Fast Cooling on Microstructure and Mechanical Properties of Pipeline Steels

X70 (steel A) and X80 (steel B) pipeline steels were fabricated by ultra fast cooling (UFC). UFC processing improves not only ultimate tensile strength (UTS), yield strength (YS), yield ratio (YS/UTS), and total elongation of both steels, but also their Charpy absorbed energy (A null null null null null null null null null null null null null null null null null null null null null null null K) as well. The microstructures of both steels were...