Continuous casting of high-carbon steels in billet and bloom sections at sub-liquidus temperatures
Project ID: 7210-CA/827Funded under: ECSC-STEELRES 7C
The report describes a research project on the continuous casting of high carbon steels in billet and bloom sections at sub-liquidus temperatures. The project's aims were to demonstrate the product advantages of sub-liquidus casting, for high carbon (0.85% C) grades, and to develop means of achieving these advantages on a system which would be applicable to production plant situations. A series of high carbon 150 mm square billet casts was carried out on the 3 t pilot plant scale over a wide range of superheats. It was found that excellent control over central segregation could be achieved as the casting superheat was reduced to liquidus and sub-liquidus levels. This trend was opposed by an increase in off-centre V-type segregation with decreasing superheat leading to an increased susceptibility to martensite formation in the rod product. Taking both trends into consideration, an optimum casting superheat of 15-25 C, at which segregation is minimised, has been identified for the high carbon grade studied. Pilot plant and physical modelling trials were conducted to develop a heat exchanger to be installed between tundish and mould, which would allow casting at these low superheats at commercial billet and bloom production rates. Initial pilot plant trials of the device and its associated metering and control systems have been encouraging.
Bibliographic Reference: EUR 13623 EN (1991) 108 pp., FS, ECU 10
ISBN: ISBN 92-826-2862-0
Record Number: 199111474 / Last updated on: 1994-12-02
Original language: en
Available languages: en