Premium
Properties of thermomechanically rolled Nb/Ti microalloyed steel sheets
Author(s) -
Tirnanić Slobodan,
Čurčic Radovanka,
Tirnanić Dragan,
Drobnjak Djordje
Publication year - 1989
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198901703
Subject(s) - niobium , metallurgy , refining (metallurgy) , titanium , charpy impact test , precipitation , materials science , austenite , microstructure , physics , meteorology
Structure and mechanical properties of a Nb/Ti microalloyed steel, thermomechanically rolled on a strip‐production facility, are evaluated. Small (0.02%) titanium addition to niobium‐containing steel is found to increase precipitation while reducing grain‐refining potential of niobium. This effect increases with increasing finish‐rolling temperature, and is also reflected in an increased charpy energy transition temperature. A reduced tendency for precipitation in a nitrogen‐free austenite together with the short interpass times in the finishing train, is assumed to reduce the tendency for pancaking, which is prerequisite for an effective grain refining.