Study of the thermomechanical behaviour of steel ladle refractory linings
A serious review of steel ladle refractory linings has become necessary due to the development of secondary metallurgy. These treatments lead to an increase in chemical and thermo-mechanical stresses due to high temperatures and long treatment times. Laboratory tests designed to reproduce ladle thermal cycles were carried out on a furnace of novel design allowing monitoring of damage by non-destructive testing. The magnesite-chrome materials tested were studied and compared with samples at the SOLLAC steelplant. Industrial trials aimed at understanding the mechanism of build-up fracturing on treatment ladle walls. The mineral phases making up the slag layers having high fusion temperatures, the build-up can only be controlled by preventative action. Obtaining an appropriate slag viscosity which deposits a supple, pliable protection layer on the lining is however difficult to achieve permanently in production. Trials were performed aiming at improving the resistance behaviour of dolomitic linings, by graphite (9%) and carbon black (6%) enrichment. It was possible to increase ladle resistance strength by at least 20%. The use of dolomite-carbon appears to be a good techno-economic compromise.
Bibliographic Reference: EUR 12137 FR (1989) MF, 157 pp., ECU 8, blow-up copy ECU 20
Record Number: 198910939 / Last updated on: 1994-12-01
Original language: fr
Available languages: fr