Low-sulfur Pressure Vessel Steels by the Electro-slag and Electric- arc-furnace Processes.
NTIS: PB 80-123003 :34 pages
Bureau of Mines research has shown that very low-sulfur pressure vessel steels with improved mechanical properties can be prepared by two melting processes. Four pressure vessel steels having sulfur contents ranging from 0.0008 to 0.0040 wt-pct, were produced by the electric-arc furnace or by the electroslag processes. Calcium carbide was used as a desulfurizer in the electric-arc furnace. Fluxes containing at least 40 wt-pct cao provided sufficient desulfurization during electroslag remelting. Element recoveries were higher for electroslag remelting than for metal melted in the electric-arc furnace. Bar rolled from electroslag-remelted ingots generally possessed higher tensile strengths and ductility than bar rolled from ingots melted in the electric-arc furnace. Charpy v- notch upper shelf energies were also improved as a result of electroslag remelting. The primary failure mode during impact testing was microvoid coalescence. Sulfide inclusions were minimal, especially in the electroslag-remelted material.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 80-123003