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Toughness Differences between Silicon-Killed and Semi-Killed Mild Steel Plate,
DEFENCE STANDARDS LABS MARIBYRNONG (AUSTRALIA)
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The notch-impact properties of a commercial silicon-killed mild steel plate are compared with an equivalent grade semi-killed steel for different specimen orientations. Contrary to expectation, the notch toughness of the silicon-killed steel was lower than that of the semi-killed steel. Room-temperature tensile properties are also compared for different specimen orientations higher yield and ultimate tensile strengths were obtained on the silicon-killed steel although ductility values were comparable with those for the semi-killed steel. It is concluded that none of these factors accounts for the lower notch toughness of the silicon-killed steel. Modified author abstract
APPROVED FOR PUBLIC RELEASE