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There are financial benefits to developing bar products which have the desired properties off-the-mill without the need for subsequent heat treatment. The main objective of the work reported here has been to develop medium carbon steel compositions suitable for producing acceptable strength and toughness levels following conventional hot rolling, ideally without resorting to controlled rolling techniques. In order to control austenite grain size and hence as-hot rolled microstructure, the use of small titanium additions to steels of the CMnSiVS family has been explored. The properties of steels with fully bainitic structures have also been examined. Laboratory prepared titanium treated CMnSiVS steels with 0.27-0.55% C and various aluminium, niobium, nitrogene, vanadium, chromium and boron levels have been subjected to a range 900 C to 1250 C giving rise to finish rolling temperatures of 820 C to 1070 C. Grain coarsening temperature measurements on these steels confirmed the effectiveness of small titanium additions in controlling austenite grain growth (up to 1250 C) although the presence of vanadium and niobium in conjunction with titanium tended to give rise to mixed grain sizes and some grain growth.

Additional information

Authors: REYNOLDS J H, British Steel, Swinden Laboratories, Rotherham (GB)
Bibliographic Reference: EUR 15833 EN (1996) 126pp., FS, ECU 16.50
Availability: Available from the (2)
ISBN: ISBN 92-827-7124-5
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