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The industrial production of cold-rolled and annealed HSLA steels, microalloyed with Nb or Nb-Ti and low carbon equivalent, poses certain problems. This study solves some of these problems using acicular or bainitic hot strip, low carbon equivalent, to produce high resistance after cold-rolling and annealing (batch or continuous). A new hot-rolling technique, based on high cooling rate on the runout table (25 to 100 C/s) and a low coiling temperature (400 C) induces bainitic transformation on the hot strip. This bainitic structure in Nb steels has some advantages, as compared to classical ferrite microstructure. With boron additions in Nb or Nb-Ti microalloyed steels, a higher homogeneity is obtained and mechanical properties appear independent of rolling conditions, in particular of cooling conditions.

Additional information

Authors: HERMAN J C, Centre de Recherches Métallurgiques, Liège (BE)
Bibliographic Reference: EUR 14786 FR (1993) 94 pp., FS, ECU 13.50
Availability: (2)
ISBN: ISBN 92-826-5811-2
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