Technical Paper

Applications of niobium microalloyed ferrite pearlite steels to line pipe and plate

International Symposium Niobium'81

A variety of advanced controlled rolling techniques have been developed to improve toughness, strength and weldability of niobium-steels. To achieve optimum properties, control of prior stage rolling conditions and accelerated cooling are needed. In low carbon steel , the addition of niobium results in a greater increase in tensile strength than that of vanadium without a loss of toughness. A t the same strength level, niobium-steel has less susceptibility to weld cracking and good toughness in the HAZ of its weldments than similar vanadium steels. Separation and formability of niobium steels are also discussed. (AU)
Technical Paper (PDF 608.08 KB)