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Low-sulfur Pressure Vessel Steels by the Electro-slag and Electric- arc-furnace Processes.

Nafziger RH; Sanker PE

NTIS: PB 80-123003 :34 pages

10007971

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.

19790101

IH; Report of Investigation;

1979

PB80-123003

A04

RI 8385

ALRC;

NTIS: PB 80-123003