The influence of N on hot ductility of V-, Nb-, and Nb-Ti- containing steels using improved thermal simulation of continuous casting
Loading...
Date
Authors
Banks, K.M. (Kevin)
Tuling, Alison
Mintz, Barrie
Journal Title
Journal ISSN
Volume Title
Publisher
Southern African Institute for Industrial Engineering
Abstract
The hot ductility of in situ melted tensile specimens of microalloyed steels having C contents in the range 0.12–0.17% (mass %) have been examined over the 700–1000°C temperature range. An improved testing method for simulating the continuous casting process was used, which takes into account both primary and secondary cooling conditions. Increasing the N content to electric arc furnace levels (0.01% N) was found to cause a serious deterioration in ductility. V-N steel gave better ductility than Nbcontaining steels due to less precipitation. From a cracking perspective, low- N steels are generally recommended but, when not feasible, a combination of Nb and V gives even better ductility. However, to be sure of avoiding transverse cracking in higher N steels a small addition of Ti is required. This resulted in a decrease in the fraction of fine particles and in accord with this better ductility. Transverse cracking of industrial slabs was then avoided.
Description
Keywords
Hot ductility, Steel, Ti additions
Sustainable Development Goals
Citation
Banks, KM, Tuling, A & Mintz, B 2011, 'The influence of N on hot ductility of V-, Nb-, and Nb-Ti- containing steels using improved thermal simulation of continuous casting', Journal of the South African Institute of Mining and Metallurgy, vol. 111, no. 10, 711-716.